3993 lines
125 KiB
JavaScript
3993 lines
125 KiB
JavaScript
/* pako 1.0.6 nodeca/pako */(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.pako = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
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'use strict';
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var TYPED_OK = (typeof Uint8Array !== 'undefined') &&
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(typeof Uint16Array !== 'undefined') &&
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(typeof Int32Array !== 'undefined');
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function _has(obj, key) {
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return Object.prototype.hasOwnProperty.call(obj, key);
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}
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exports.assign = function (obj /*from1, from2, from3, ...*/) {
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var sources = Array.prototype.slice.call(arguments, 1);
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while (sources.length) {
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var source = sources.shift();
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if (!source) { continue; }
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if (typeof source !== 'object') {
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throw new TypeError(source + 'must be non-object');
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}
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for (var p in source) {
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if (_has(source, p)) {
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obj[p] = source[p];
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}
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}
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}
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return obj;
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};
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// reduce buffer size, avoiding mem copy
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exports.shrinkBuf = function (buf, size) {
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if (buf.length === size) { return buf; }
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if (buf.subarray) { return buf.subarray(0, size); }
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buf.length = size;
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return buf;
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};
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var fnTyped = {
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arraySet: function (dest, src, src_offs, len, dest_offs) {
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if (src.subarray && dest.subarray) {
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dest.set(src.subarray(src_offs, src_offs + len), dest_offs);
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return;
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}
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// Fallback to ordinary array
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for (var i = 0; i < len; i++) {
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dest[dest_offs + i] = src[src_offs + i];
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}
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},
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// Join array of chunks to single array.
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flattenChunks: function (chunks) {
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var i, l, len, pos, chunk, result;
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// calculate data length
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len = 0;
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for (i = 0, l = chunks.length; i < l; i++) {
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len += chunks[i].length;
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}
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// join chunks
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result = new Uint8Array(len);
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pos = 0;
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for (i = 0, l = chunks.length; i < l; i++) {
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chunk = chunks[i];
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result.set(chunk, pos);
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pos += chunk.length;
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}
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return result;
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}
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};
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var fnUntyped = {
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arraySet: function (dest, src, src_offs, len, dest_offs) {
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for (var i = 0; i < len; i++) {
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dest[dest_offs + i] = src[src_offs + i];
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}
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},
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// Join array of chunks to single array.
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flattenChunks: function (chunks) {
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return [].concat.apply([], chunks);
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}
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};
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// Enable/Disable typed arrays use, for testing
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//
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exports.setTyped = function (on) {
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if (on) {
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exports.Buf8 = Uint8Array;
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exports.Buf16 = Uint16Array;
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exports.Buf32 = Int32Array;
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exports.assign(exports, fnTyped);
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} else {
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exports.Buf8 = Array;
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exports.Buf16 = Array;
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exports.Buf32 = Array;
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exports.assign(exports, fnUntyped);
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}
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};
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exports.setTyped(TYPED_OK);
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},{}],2:[function(require,module,exports){
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// String encode/decode helpers
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'use strict';
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var utils = require('./common');
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// Quick check if we can use fast array to bin string conversion
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//
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// - apply(Array) can fail on Android 2.2
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// - apply(Uint8Array) can fail on iOS 5.1 Safari
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//
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var STR_APPLY_OK = true;
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var STR_APPLY_UIA_OK = true;
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try { String.fromCharCode.apply(null, [ 0 ]); } catch (__) { STR_APPLY_OK = false; }
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try { String.fromCharCode.apply(null, new Uint8Array(1)); } catch (__) { STR_APPLY_UIA_OK = false; }
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// Table with utf8 lengths (calculated by first byte of sequence)
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// Note, that 5 & 6-byte values and some 4-byte values can not be represented in JS,
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// because max possible codepoint is 0x10ffff
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var _utf8len = new utils.Buf8(256);
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for (var q = 0; q < 256; q++) {
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_utf8len[q] = (q >= 252 ? 6 : q >= 248 ? 5 : q >= 240 ? 4 : q >= 224 ? 3 : q >= 192 ? 2 : 1);
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}
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_utf8len[254] = _utf8len[254] = 1; // Invalid sequence start
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// convert string to array (typed, when possible)
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exports.string2buf = function (str) {
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var buf, c, c2, m_pos, i, str_len = str.length, buf_len = 0;
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// count binary size
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for (m_pos = 0; m_pos < str_len; m_pos++) {
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c = str.charCodeAt(m_pos);
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if ((c & 0xfc00) === 0xd800 && (m_pos + 1 < str_len)) {
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c2 = str.charCodeAt(m_pos + 1);
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if ((c2 & 0xfc00) === 0xdc00) {
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c = 0x10000 + ((c - 0xd800) << 10) + (c2 - 0xdc00);
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m_pos++;
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}
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}
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buf_len += c < 0x80 ? 1 : c < 0x800 ? 2 : c < 0x10000 ? 3 : 4;
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}
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// allocate buffer
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buf = new utils.Buf8(buf_len);
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// convert
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for (i = 0, m_pos = 0; i < buf_len; m_pos++) {
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c = str.charCodeAt(m_pos);
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if ((c & 0xfc00) === 0xd800 && (m_pos + 1 < str_len)) {
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c2 = str.charCodeAt(m_pos + 1);
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if ((c2 & 0xfc00) === 0xdc00) {
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c = 0x10000 + ((c - 0xd800) << 10) + (c2 - 0xdc00);
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m_pos++;
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}
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}
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if (c < 0x80) {
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/* one byte */
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buf[i++] = c;
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} else if (c < 0x800) {
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/* two bytes */
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buf[i++] = 0xC0 | (c >>> 6);
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buf[i++] = 0x80 | (c & 0x3f);
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} else if (c < 0x10000) {
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/* three bytes */
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buf[i++] = 0xE0 | (c >>> 12);
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buf[i++] = 0x80 | (c >>> 6 & 0x3f);
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buf[i++] = 0x80 | (c & 0x3f);
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} else {
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/* four bytes */
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buf[i++] = 0xf0 | (c >>> 18);
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buf[i++] = 0x80 | (c >>> 12 & 0x3f);
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buf[i++] = 0x80 | (c >>> 6 & 0x3f);
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buf[i++] = 0x80 | (c & 0x3f);
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}
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}
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return buf;
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};
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// Helper (used in 2 places)
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function buf2binstring(buf, len) {
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// use fallback for big arrays to avoid stack overflow
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if (len < 65537) {
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if ((buf.subarray && STR_APPLY_UIA_OK) || (!buf.subarray && STR_APPLY_OK)) {
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return String.fromCharCode.apply(null, utils.shrinkBuf(buf, len));
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}
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}
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var result = '';
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for (var i = 0; i < len; i++) {
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result += String.fromCharCode(buf[i]);
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}
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return result;
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}
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// Convert byte array to binary string
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exports.buf2binstring = function (buf) {
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return buf2binstring(buf, buf.length);
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};
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// Convert binary string (typed, when possible)
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exports.binstring2buf = function (str) {
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var buf = new utils.Buf8(str.length);
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for (var i = 0, len = buf.length; i < len; i++) {
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buf[i] = str.charCodeAt(i);
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}
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return buf;
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};
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// convert array to string
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exports.buf2string = function (buf, max) {
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var i, out, c, c_len;
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var len = max || buf.length;
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// Reserve max possible length (2 words per char)
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// NB: by unknown reasons, Array is significantly faster for
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// String.fromCharCode.apply than Uint16Array.
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var utf16buf = new Array(len * 2);
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for (out = 0, i = 0; i < len;) {
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c = buf[i++];
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// quick process ascii
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if (c < 0x80) { utf16buf[out++] = c; continue; }
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c_len = _utf8len[c];
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// skip 5 & 6 byte codes
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if (c_len > 4) { utf16buf[out++] = 0xfffd; i += c_len - 1; continue; }
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// apply mask on first byte
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c &= c_len === 2 ? 0x1f : c_len === 3 ? 0x0f : 0x07;
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// join the rest
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while (c_len > 1 && i < len) {
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c = (c << 6) | (buf[i++] & 0x3f);
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c_len--;
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}
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// terminated by end of string?
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if (c_len > 1) { utf16buf[out++] = 0xfffd; continue; }
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if (c < 0x10000) {
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utf16buf[out++] = c;
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} else {
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c -= 0x10000;
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utf16buf[out++] = 0xd800 | ((c >> 10) & 0x3ff);
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utf16buf[out++] = 0xdc00 | (c & 0x3ff);
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}
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}
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return buf2binstring(utf16buf, out);
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};
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// Calculate max possible position in utf8 buffer,
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// that will not break sequence. If that's not possible
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// - (very small limits) return max size as is.
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//
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// buf[] - utf8 bytes array
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// max - length limit (mandatory);
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exports.utf8border = function (buf, max) {
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var pos;
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max = max || buf.length;
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if (max > buf.length) { max = buf.length; }
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// go back from last position, until start of sequence found
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pos = max - 1;
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while (pos >= 0 && (buf[pos] & 0xC0) === 0x80) { pos--; }
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// Very small and broken sequence,
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// return max, because we should return something anyway.
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if (pos < 0) { return max; }
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// If we came to start of buffer - that means buffer is too small,
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// return max too.
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if (pos === 0) { return max; }
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return (pos + _utf8len[buf[pos]] > max) ? pos : max;
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};
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},{"./common":1}],3:[function(require,module,exports){
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'use strict';
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// Note: adler32 takes 12% for level 0 and 2% for level 6.
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// It isn't worth it to make additional optimizations as in original.
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// Small size is preferable.
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// (C) 1995-2013 Jean-loup Gailly and Mark Adler
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// (C) 2014-2017 Vitaly Puzrin and Andrey Tupitsin
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//
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// This software is provided 'as-is', without any express or implied
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// warranty. In no event will the authors be held liable for any damages
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// arising from the use of this software.
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//
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// Permission is granted to anyone to use this software for any purpose,
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// including commercial applications, and to alter it and redistribute it
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// freely, subject to the following restrictions:
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//
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// 1. The origin of this software must not be misrepresented; you must not
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// claim that you wrote the original software. If you use this software
|
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// in a product, an acknowledgment in the product documentation would be
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// appreciated but is not required.
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// 2. Altered source versions must be plainly marked as such, and must not be
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// misrepresented as being the original software.
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// 3. This notice may not be removed or altered from any source distribution.
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function adler32(adler, buf, len, pos) {
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var s1 = (adler & 0xffff) |0,
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s2 = ((adler >>> 16) & 0xffff) |0,
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n = 0;
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while (len !== 0) {
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// Set limit ~ twice less than 5552, to keep
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// s2 in 31-bits, because we force signed ints.
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// in other case %= will fail.
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n = len > 2000 ? 2000 : len;
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len -= n;
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do {
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s1 = (s1 + buf[pos++]) |0;
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s2 = (s2 + s1) |0;
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} while (--n);
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s1 %= 65521;
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s2 %= 65521;
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}
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return (s1 | (s2 << 16)) |0;
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}
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module.exports = adler32;
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},{}],4:[function(require,module,exports){
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'use strict';
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// Note: we can't get significant speed boost here.
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// So write code to minimize size - no pregenerated tables
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// and array tools dependencies.
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// (C) 1995-2013 Jean-loup Gailly and Mark Adler
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// (C) 2014-2017 Vitaly Puzrin and Andrey Tupitsin
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//
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// This software is provided 'as-is', without any express or implied
|
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// warranty. In no event will the authors be held liable for any damages
|
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// arising from the use of this software.
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//
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// Permission is granted to anyone to use this software for any purpose,
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// including commercial applications, and to alter it and redistribute it
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// freely, subject to the following restrictions:
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//
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// 1. The origin of this software must not be misrepresented; you must not
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// claim that you wrote the original software. If you use this software
|
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// in a product, an acknowledgment in the product documentation would be
|
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// appreciated but is not required.
|
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// 2. Altered source versions must be plainly marked as such, and must not be
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// misrepresented as being the original software.
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// 3. This notice may not be removed or altered from any source distribution.
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// Use ordinary array, since untyped makes no boost here
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function makeTable() {
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var c, table = [];
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for (var n = 0; n < 256; n++) {
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c = n;
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for (var k = 0; k < 8; k++) {
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c = ((c & 1) ? (0xEDB88320 ^ (c >>> 1)) : (c >>> 1));
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}
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table[n] = c;
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}
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return table;
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}
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// Create table on load. Just 255 signed longs. Not a problem.
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var crcTable = makeTable();
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function crc32(crc, buf, len, pos) {
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var t = crcTable,
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end = pos + len;
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crc ^= -1;
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for (var i = pos; i < end; i++) {
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crc = (crc >>> 8) ^ t[(crc ^ buf[i]) & 0xFF];
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}
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return (crc ^ (-1)); // >>> 0;
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}
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module.exports = crc32;
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|
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},{}],5:[function(require,module,exports){
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'use strict';
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|
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// (C) 1995-2013 Jean-loup Gailly and Mark Adler
|
|
// (C) 2014-2017 Vitaly Puzrin and Andrey Tupitsin
|
|
//
|
|
// This software is provided 'as-is', without any express or implied
|
|
// warranty. In no event will the authors be held liable for any damages
|
|
// arising from the use of this software.
|
|
//
|
|
// Permission is granted to anyone to use this software for any purpose,
|
|
// including commercial applications, and to alter it and redistribute it
|
|
// freely, subject to the following restrictions:
|
|
//
|
|
// 1. The origin of this software must not be misrepresented; you must not
|
|
// claim that you wrote the original software. If you use this software
|
|
// in a product, an acknowledgment in the product documentation would be
|
|
// appreciated but is not required.
|
|
// 2. Altered source versions must be plainly marked as such, and must not be
|
|
// misrepresented as being the original software.
|
|
// 3. This notice may not be removed or altered from any source distribution.
|
|
|
|
var utils = require('../utils/common');
|
|
var trees = require('./trees');
|
|
var adler32 = require('./adler32');
|
|
var crc32 = require('./crc32');
|
|
var msg = require('./messages');
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|
|
|
/* Public constants ==========================================================*/
|
|
/* ===========================================================================*/
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|
|
|
|
/* Allowed flush values; see deflate() and inflate() below for details */
|
|
var Z_NO_FLUSH = 0;
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|
var Z_PARTIAL_FLUSH = 1;
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|
//var Z_SYNC_FLUSH = 2;
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|
var Z_FULL_FLUSH = 3;
|
|
var Z_FINISH = 4;
|
|
var Z_BLOCK = 5;
|
|
//var Z_TREES = 6;
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|
|
|
|
/* Return codes for the compression/decompression functions. Negative values
|
|
* are errors, positive values are used for special but normal events.
|
|
*/
|
|
var Z_OK = 0;
|
|
var Z_STREAM_END = 1;
|
|
//var Z_NEED_DICT = 2;
|
|
//var Z_ERRNO = -1;
|
|
var Z_STREAM_ERROR = -2;
|
|
var Z_DATA_ERROR = -3;
|
|
//var Z_MEM_ERROR = -4;
|
|
var Z_BUF_ERROR = -5;
|
|
//var Z_VERSION_ERROR = -6;
|
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|
|
|
|
/* compression levels */
|
|
//var Z_NO_COMPRESSION = 0;
|
|
//var Z_BEST_SPEED = 1;
|
|
//var Z_BEST_COMPRESSION = 9;
|
|
var Z_DEFAULT_COMPRESSION = -1;
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|
|
|
|
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var Z_FILTERED = 1;
|
|
var Z_HUFFMAN_ONLY = 2;
|
|
var Z_RLE = 3;
|
|
var Z_FIXED = 4;
|
|
var Z_DEFAULT_STRATEGY = 0;
|
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|
|
/* Possible values of the data_type field (though see inflate()) */
|
|
//var Z_BINARY = 0;
|
|
//var Z_TEXT = 1;
|
|
//var Z_ASCII = 1; // = Z_TEXT
|
|
var Z_UNKNOWN = 2;
|
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|
|
|
|
/* The deflate compression method */
|
|
var Z_DEFLATED = 8;
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|
|
|
/*============================================================================*/
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|
|
|
|
|
var MAX_MEM_LEVEL = 9;
|
|
/* Maximum value for memLevel in deflateInit2 */
|
|
var MAX_WBITS = 15;
|
|
/* 32K LZ77 window */
|
|
var DEF_MEM_LEVEL = 8;
|
|
|
|
|
|
var LENGTH_CODES = 29;
|
|
/* number of length codes, not counting the special END_BLOCK code */
|
|
var LITERALS = 256;
|
|
/* number of literal bytes 0..255 */
|
|
var L_CODES = LITERALS + 1 + LENGTH_CODES;
|
|
/* number of Literal or Length codes, including the END_BLOCK code */
|
|
var D_CODES = 30;
|
|
/* number of distance codes */
|
|
var BL_CODES = 19;
|
|
/* number of codes used to transfer the bit lengths */
|
|
var HEAP_SIZE = 2 * L_CODES + 1;
|
|
/* maximum heap size */
|
|
var MAX_BITS = 15;
|
|
/* All codes must not exceed MAX_BITS bits */
|
|
|
|
var MIN_MATCH = 3;
|
|
var MAX_MATCH = 258;
|
|
var MIN_LOOKAHEAD = (MAX_MATCH + MIN_MATCH + 1);
|
|
|
|
var PRESET_DICT = 0x20;
|
|
|
|
var INIT_STATE = 42;
|
|
var EXTRA_STATE = 69;
|
|
var NAME_STATE = 73;
|
|
var COMMENT_STATE = 91;
|
|
var HCRC_STATE = 103;
|
|
var BUSY_STATE = 113;
|
|
var FINISH_STATE = 666;
|
|
|
|
var BS_NEED_MORE = 1; /* block not completed, need more input or more output */
|
|
var BS_BLOCK_DONE = 2; /* block flush performed */
|
|
var BS_FINISH_STARTED = 3; /* finish started, need only more output at next deflate */
|
|
var BS_FINISH_DONE = 4; /* finish done, accept no more input or output */
|
|
|
|
var OS_CODE = 0x03; // Unix :) . Don't detect, use this default.
|
|
|
|
function err(strm, errorCode) {
|
|
strm.msg = msg[errorCode];
|
|
return errorCode;
|
|
}
|
|
|
|
function rank(f) {
|
|
return ((f) << 1) - ((f) > 4 ? 9 : 0);
|
|
}
|
|
|
|
function zero(buf) { var len = buf.length; while (--len >= 0) { buf[len] = 0; } }
|
|
|
|
|
|
/* =========================================================================
|
|
* Flush as much pending output as possible. All deflate() output goes
|
|
* through this function so some applications may wish to modify it
|
|
* to avoid allocating a large strm->output buffer and copying into it.
|
|
* (See also read_buf()).
|
|
*/
|
|
function flush_pending(strm) {
|
|
var s = strm.state;
|
|
|
|
//_tr_flush_bits(s);
|
|
var len = s.pending;
|
|
if (len > strm.avail_out) {
|
|
len = strm.avail_out;
|
|
}
|
|
if (len === 0) { return; }
|
|
|
|
utils.arraySet(strm.output, s.pending_buf, s.pending_out, len, strm.next_out);
|
|
strm.next_out += len;
|
|
s.pending_out += len;
|
|
strm.total_out += len;
|
|
strm.avail_out -= len;
|
|
s.pending -= len;
|
|
if (s.pending === 0) {
|
|
s.pending_out = 0;
|
|
}
|
|
}
|
|
|
|
|
|
function flush_block_only(s, last) {
|
|
trees._tr_flush_block(s, (s.block_start >= 0 ? s.block_start : -1), s.strstart - s.block_start, last);
|
|
s.block_start = s.strstart;
|
|
flush_pending(s.strm);
|
|
}
|
|
|
|
|
|
function put_byte(s, b) {
|
|
s.pending_buf[s.pending++] = b;
|
|
}
|
|
|
|
|
|
/* =========================================================================
|
|
* Put a short in the pending buffer. The 16-bit value is put in MSB order.
|
|
* IN assertion: the stream state is correct and there is enough room in
|
|
* pending_buf.
|
|
*/
|
|
function putShortMSB(s, b) {
|
|
// put_byte(s, (Byte)(b >> 8));
|
|
// put_byte(s, (Byte)(b & 0xff));
|
|
s.pending_buf[s.pending++] = (b >>> 8) & 0xff;
|
|
s.pending_buf[s.pending++] = b & 0xff;
|
|
}
|
|
|
|
|
|
/* ===========================================================================
|
|
* Read a new buffer from the current input stream, update the adler32
|
|
* and total number of bytes read. All deflate() input goes through
|
|
* this function so some applications may wish to modify it to avoid
|
|
* allocating a large strm->input buffer and copying from it.
|
|
* (See also flush_pending()).
|
|
*/
|
|
function read_buf(strm, buf, start, size) {
|
|
var len = strm.avail_in;
|
|
|
|
if (len > size) { len = size; }
|
|
if (len === 0) { return 0; }
|
|
|
|
strm.avail_in -= len;
|
|
|
|
// zmemcpy(buf, strm->next_in, len);
|
|
utils.arraySet(buf, strm.input, strm.next_in, len, start);
|
|
if (strm.state.wrap === 1) {
|
|
strm.adler = adler32(strm.adler, buf, len, start);
|
|
}
|
|
|
|
else if (strm.state.wrap === 2) {
|
|
strm.adler = crc32(strm.adler, buf, len, start);
|
|
}
|
|
|
|
strm.next_in += len;
|
|
strm.total_in += len;
|
|
|
|
return len;
|
|
}
|
|
|
|
|
|
/* ===========================================================================
|
|
* Set match_start to the longest match starting at the given string and
|
|
* return its length. Matches shorter or equal to prev_length are discarded,
|
|
* in which case the result is equal to prev_length and match_start is
|
|
* garbage.
|
|
* IN assertions: cur_match is the head of the hash chain for the current
|
|
* string (strstart) and its distance is <= MAX_DIST, and prev_length >= 1
|
|
* OUT assertion: the match length is not greater than s->lookahead.
|
|
*/
|
|
function longest_match(s, cur_match) {
|
|
var chain_length = s.max_chain_length; /* max hash chain length */
|
|
var scan = s.strstart; /* current string */
|
|
var match; /* matched string */
|
|
var len; /* length of current match */
|
|
var best_len = s.prev_length; /* best match length so far */
|
|
var nice_match = s.nice_match; /* stop if match long enough */
|
|
var limit = (s.strstart > (s.w_size - MIN_LOOKAHEAD)) ?
|
|
s.strstart - (s.w_size - MIN_LOOKAHEAD) : 0/*NIL*/;
|
|
|
|
var _win = s.window; // shortcut
|
|
|
|
var wmask = s.w_mask;
|
|
var prev = s.prev;
|
|
|
|
/* Stop when cur_match becomes <= limit. To simplify the code,
|
|
* we prevent matches with the string of window index 0.
|
|
*/
|
|
|
|
var strend = s.strstart + MAX_MATCH;
|
|
var scan_end1 = _win[scan + best_len - 1];
|
|
var scan_end = _win[scan + best_len];
|
|
|
|
/* The code is optimized for HASH_BITS >= 8 and MAX_MATCH-2 multiple of 16.
|
|
* It is easy to get rid of this optimization if necessary.
|
|
*/
|
|
// Assert(s->hash_bits >= 8 && MAX_MATCH == 258, "Code too clever");
|
|
|
|
/* Do not waste too much time if we already have a good match: */
|
|
if (s.prev_length >= s.good_match) {
|
|
chain_length >>= 2;
|
|
}
|
|
/* Do not look for matches beyond the end of the input. This is necessary
|
|
* to make deflate deterministic.
|
|
*/
|
|
if (nice_match > s.lookahead) { nice_match = s.lookahead; }
|
|
|
|
// Assert((ulg)s->strstart <= s->window_size-MIN_LOOKAHEAD, "need lookahead");
|
|
|
|
do {
|
|
// Assert(cur_match < s->strstart, "no future");
|
|
match = cur_match;
|
|
|
|
/* Skip to next match if the match length cannot increase
|
|
* or if the match length is less than 2. Note that the checks below
|
|
* for insufficient lookahead only occur occasionally for performance
|
|
* reasons. Therefore uninitialized memory will be accessed, and
|
|
* conditional jumps will be made that depend on those values.
|
|
* However the length of the match is limited to the lookahead, so
|
|
* the output of deflate is not affected by the uninitialized values.
|
|
*/
|
|
|
|
if (_win[match + best_len] !== scan_end ||
|
|
_win[match + best_len - 1] !== scan_end1 ||
|
|
_win[match] !== _win[scan] ||
|
|
_win[++match] !== _win[scan + 1]) {
|
|
continue;
|
|
}
|
|
|
|
/* The check at best_len-1 can be removed because it will be made
|
|
* again later. (This heuristic is not always a win.)
|
|
* It is not necessary to compare scan[2] and match[2] since they
|
|
* are always equal when the other bytes match, given that
|
|
* the hash keys are equal and that HASH_BITS >= 8.
|
|
*/
|
|
scan += 2;
|
|
match++;
|
|
// Assert(*scan == *match, "match[2]?");
|
|
|
|
/* We check for insufficient lookahead only every 8th comparison;
|
|
* the 256th check will be made at strstart+258.
|
|
*/
|
|
do {
|
|
/*jshint noempty:false*/
|
|
} while (_win[++scan] === _win[++match] && _win[++scan] === _win[++match] &&
|
|
_win[++scan] === _win[++match] && _win[++scan] === _win[++match] &&
|
|
_win[++scan] === _win[++match] && _win[++scan] === _win[++match] &&
|
|
_win[++scan] === _win[++match] && _win[++scan] === _win[++match] &&
|
|
scan < strend);
|
|
|
|
// Assert(scan <= s->window+(unsigned)(s->window_size-1), "wild scan");
|
|
|
|
len = MAX_MATCH - (strend - scan);
|
|
scan = strend - MAX_MATCH;
|
|
|
|
if (len > best_len) {
|
|
s.match_start = cur_match;
|
|
best_len = len;
|
|
if (len >= nice_match) {
|
|
break;
|
|
}
|
|
scan_end1 = _win[scan + best_len - 1];
|
|
scan_end = _win[scan + best_len];
|
|
}
|
|
} while ((cur_match = prev[cur_match & wmask]) > limit && --chain_length !== 0);
|
|
|
|
if (best_len <= s.lookahead) {
|
|
return best_len;
|
|
}
|
|
return s.lookahead;
|
|
}
|
|
|
|
|
|
/* ===========================================================================
|
|
* Fill the window when the lookahead becomes insufficient.
|
|
* Updates strstart and lookahead.
|
|
*
|
|
* IN assertion: lookahead < MIN_LOOKAHEAD
|
|
* OUT assertions: strstart <= window_size-MIN_LOOKAHEAD
|
|
* At least one byte has been read, or avail_in == 0; reads are
|
|
* performed for at least two bytes (required for the zip translate_eol
|
|
* option -- not supported here).
|
|
*/
|
|
function fill_window(s) {
|
|
var _w_size = s.w_size;
|
|
var p, n, m, more, str;
|
|
|
|
//Assert(s->lookahead < MIN_LOOKAHEAD, "already enough lookahead");
|
|
|
|
do {
|
|
more = s.window_size - s.lookahead - s.strstart;
|
|
|
|
// JS ints have 32 bit, block below not needed
|
|
/* Deal with !@#$% 64K limit: */
|
|
//if (sizeof(int) <= 2) {
|
|
// if (more == 0 && s->strstart == 0 && s->lookahead == 0) {
|
|
// more = wsize;
|
|
//
|
|
// } else if (more == (unsigned)(-1)) {
|
|
// /* Very unlikely, but possible on 16 bit machine if
|
|
// * strstart == 0 && lookahead == 1 (input done a byte at time)
|
|
// */
|
|
// more--;
|
|
// }
|
|
//}
|
|
|
|
|
|
/* If the window is almost full and there is insufficient lookahead,
|
|
* move the upper half to the lower one to make room in the upper half.
|
|
*/
|
|
if (s.strstart >= _w_size + (_w_size - MIN_LOOKAHEAD)) {
|
|
|
|
utils.arraySet(s.window, s.window, _w_size, _w_size, 0);
|
|
s.match_start -= _w_size;
|
|
s.strstart -= _w_size;
|
|
/* we now have strstart >= MAX_DIST */
|
|
s.block_start -= _w_size;
|
|
|
|
/* Slide the hash table (could be avoided with 32 bit values
|
|
at the expense of memory usage). We slide even when level == 0
|
|
to keep the hash table consistent if we switch back to level > 0
|
|
later. (Using level 0 permanently is not an optimal usage of
|
|
zlib, so we don't care about this pathological case.)
|
|
*/
|
|
|
|
n = s.hash_size;
|
|
p = n;
|
|
do {
|
|
m = s.head[--p];
|
|
s.head[p] = (m >= _w_size ? m - _w_size : 0);
|
|
} while (--n);
|
|
|
|
n = _w_size;
|
|
p = n;
|
|
do {
|
|
m = s.prev[--p];
|
|
s.prev[p] = (m >= _w_size ? m - _w_size : 0);
|
|
/* If n is not on any hash chain, prev[n] is garbage but
|
|
* its value will never be used.
|
|
*/
|
|
} while (--n);
|
|
|
|
more += _w_size;
|
|
}
|
|
if (s.strm.avail_in === 0) {
|
|
break;
|
|
}
|
|
|
|
/* If there was no sliding:
|
|
* strstart <= WSIZE+MAX_DIST-1 && lookahead <= MIN_LOOKAHEAD - 1 &&
|
|
* more == window_size - lookahead - strstart
|
|
* => more >= window_size - (MIN_LOOKAHEAD-1 + WSIZE + MAX_DIST-1)
|
|
* => more >= window_size - 2*WSIZE + 2
|
|
* In the BIG_MEM or MMAP case (not yet supported),
|
|
* window_size == input_size + MIN_LOOKAHEAD &&
|
|
* strstart + s->lookahead <= input_size => more >= MIN_LOOKAHEAD.
|
|
* Otherwise, window_size == 2*WSIZE so more >= 2.
|
|
* If there was sliding, more >= WSIZE. So in all cases, more >= 2.
|
|
*/
|
|
//Assert(more >= 2, "more < 2");
|
|
n = read_buf(s.strm, s.window, s.strstart + s.lookahead, more);
|
|
s.lookahead += n;
|
|
|
|
/* Initialize the hash value now that we have some input: */
|
|
if (s.lookahead + s.insert >= MIN_MATCH) {
|
|
str = s.strstart - s.insert;
|
|
s.ins_h = s.window[str];
|
|
|
|
/* UPDATE_HASH(s, s->ins_h, s->window[str + 1]); */
|
|
s.ins_h = ((s.ins_h << s.hash_shift) ^ s.window[str + 1]) & s.hash_mask;
|
|
//#if MIN_MATCH != 3
|
|
// Call update_hash() MIN_MATCH-3 more times
|
|
//#endif
|
|
while (s.insert) {
|
|
/* UPDATE_HASH(s, s->ins_h, s->window[str + MIN_MATCH-1]); */
|
|
s.ins_h = ((s.ins_h << s.hash_shift) ^ s.window[str + MIN_MATCH - 1]) & s.hash_mask;
|
|
|
|
s.prev[str & s.w_mask] = s.head[s.ins_h];
|
|
s.head[s.ins_h] = str;
|
|
str++;
|
|
s.insert--;
|
|
if (s.lookahead + s.insert < MIN_MATCH) {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
/* If the whole input has less than MIN_MATCH bytes, ins_h is garbage,
|
|
* but this is not important since only literal bytes will be emitted.
|
|
*/
|
|
|
|
} while (s.lookahead < MIN_LOOKAHEAD && s.strm.avail_in !== 0);
|
|
|
|
/* If the WIN_INIT bytes after the end of the current data have never been
|
|
* written, then zero those bytes in order to avoid memory check reports of
|
|
* the use of uninitialized (or uninitialised as Julian writes) bytes by
|
|
* the longest match routines. Update the high water mark for the next
|
|
* time through here. WIN_INIT is set to MAX_MATCH since the longest match
|
|
* routines allow scanning to strstart + MAX_MATCH, ignoring lookahead.
|
|
*/
|
|
// if (s.high_water < s.window_size) {
|
|
// var curr = s.strstart + s.lookahead;
|
|
// var init = 0;
|
|
//
|
|
// if (s.high_water < curr) {
|
|
// /* Previous high water mark below current data -- zero WIN_INIT
|
|
// * bytes or up to end of window, whichever is less.
|
|
// */
|
|
// init = s.window_size - curr;
|
|
// if (init > WIN_INIT)
|
|
// init = WIN_INIT;
|
|
// zmemzero(s->window + curr, (unsigned)init);
|
|
// s->high_water = curr + init;
|
|
// }
|
|
// else if (s->high_water < (ulg)curr + WIN_INIT) {
|
|
// /* High water mark at or above current data, but below current data
|
|
// * plus WIN_INIT -- zero out to current data plus WIN_INIT, or up
|
|
// * to end of window, whichever is less.
|
|
// */
|
|
// init = (ulg)curr + WIN_INIT - s->high_water;
|
|
// if (init > s->window_size - s->high_water)
|
|
// init = s->window_size - s->high_water;
|
|
// zmemzero(s->window + s->high_water, (unsigned)init);
|
|
// s->high_water += init;
|
|
// }
|
|
// }
|
|
//
|
|
// Assert((ulg)s->strstart <= s->window_size - MIN_LOOKAHEAD,
|
|
// "not enough room for search");
|
|
}
|
|
|
|
/* ===========================================================================
|
|
* Copy without compression as much as possible from the input stream, return
|
|
* the current block state.
|
|
* This function does not insert new strings in the dictionary since
|
|
* uncompressible data is probably not useful. This function is used
|
|
* only for the level=0 compression option.
|
|
* NOTE: this function should be optimized to avoid extra copying from
|
|
* window to pending_buf.
|
|
*/
|
|
function deflate_stored(s, flush) {
|
|
/* Stored blocks are limited to 0xffff bytes, pending_buf is limited
|
|
* to pending_buf_size, and each stored block has a 5 byte header:
|
|
*/
|
|
var max_block_size = 0xffff;
|
|
|
|
if (max_block_size > s.pending_buf_size - 5) {
|
|
max_block_size = s.pending_buf_size - 5;
|
|
}
|
|
|
|
/* Copy as much as possible from input to output: */
|
|
for (;;) {
|
|
/* Fill the window as much as possible: */
|
|
if (s.lookahead <= 1) {
|
|
|
|
//Assert(s->strstart < s->w_size+MAX_DIST(s) ||
|
|
// s->block_start >= (long)s->w_size, "slide too late");
|
|
// if (!(s.strstart < s.w_size + (s.w_size - MIN_LOOKAHEAD) ||
|
|
// s.block_start >= s.w_size)) {
|
|
// throw new Error("slide too late");
|
|
// }
|
|
|
|
fill_window(s);
|
|
if (s.lookahead === 0 && flush === Z_NO_FLUSH) {
|
|
return BS_NEED_MORE;
|
|
}
|
|
|
|
if (s.lookahead === 0) {
|
|
break;
|
|
}
|
|
/* flush the current block */
|
|
}
|
|
//Assert(s->block_start >= 0L, "block gone");
|
|
// if (s.block_start < 0) throw new Error("block gone");
|
|
|
|
s.strstart += s.lookahead;
|
|
s.lookahead = 0;
|
|
|
|
/* Emit a stored block if pending_buf will be full: */
|
|
var max_start = s.block_start + max_block_size;
|
|
|
|
if (s.strstart === 0 || s.strstart >= max_start) {
|
|
/* strstart == 0 is possible when wraparound on 16-bit machine */
|
|
s.lookahead = s.strstart - max_start;
|
|
s.strstart = max_start;
|
|
/*** FLUSH_BLOCK(s, 0); ***/
|
|
flush_block_only(s, false);
|
|
if (s.strm.avail_out === 0) {
|
|
return BS_NEED_MORE;
|
|
}
|
|
/***/
|
|
|
|
|
|
}
|
|
/* Flush if we may have to slide, otherwise block_start may become
|
|
* negative and the data will be gone:
|
|
*/
|
|
if (s.strstart - s.block_start >= (s.w_size - MIN_LOOKAHEAD)) {
|
|
/*** FLUSH_BLOCK(s, 0); ***/
|
|
flush_block_only(s, false);
|
|
if (s.strm.avail_out === 0) {
|
|
return BS_NEED_MORE;
|
|
}
|
|
/***/
|
|
}
|
|
}
|
|
|
|
s.insert = 0;
|
|
|
|
if (flush === Z_FINISH) {
|
|
/*** FLUSH_BLOCK(s, 1); ***/
|
|
flush_block_only(s, true);
|
|
if (s.strm.avail_out === 0) {
|
|
return BS_FINISH_STARTED;
|
|
}
|
|
/***/
|
|
return BS_FINISH_DONE;
|
|
}
|
|
|
|
if (s.strstart > s.block_start) {
|
|
/*** FLUSH_BLOCK(s, 0); ***/
|
|
flush_block_only(s, false);
|
|
if (s.strm.avail_out === 0) {
|
|
return BS_NEED_MORE;
|
|
}
|
|
/***/
|
|
}
|
|
|
|
return BS_NEED_MORE;
|
|
}
|
|
|
|
/* ===========================================================================
|
|
* Compress as much as possible from the input stream, return the current
|
|
* block state.
|
|
* This function does not perform lazy evaluation of matches and inserts
|
|
* new strings in the dictionary only for unmatched strings or for short
|
|
* matches. It is used only for the fast compression options.
|
|
*/
|
|
function deflate_fast(s, flush) {
|
|
var hash_head; /* head of the hash chain */
|
|
var bflush; /* set if current block must be flushed */
|
|
|
|
for (;;) {
|
|
/* Make sure that we always have enough lookahead, except
|
|
* at the end of the input file. We need MAX_MATCH bytes
|
|
* for the next match, plus MIN_MATCH bytes to insert the
|
|
* string following the next match.
|
|
*/
|
|
if (s.lookahead < MIN_LOOKAHEAD) {
|
|
fill_window(s);
|
|
if (s.lookahead < MIN_LOOKAHEAD && flush === Z_NO_FLUSH) {
|
|
return BS_NEED_MORE;
|
|
}
|
|
if (s.lookahead === 0) {
|
|
break; /* flush the current block */
|
|
}
|
|
}
|
|
|
|
/* Insert the string window[strstart .. strstart+2] in the
|
|
* dictionary, and set hash_head to the head of the hash chain:
|
|
*/
|
|
hash_head = 0/*NIL*/;
|
|
if (s.lookahead >= MIN_MATCH) {
|
|
/*** INSERT_STRING(s, s.strstart, hash_head); ***/
|
|
s.ins_h = ((s.ins_h << s.hash_shift) ^ s.window[s.strstart + MIN_MATCH - 1]) & s.hash_mask;
|
|
hash_head = s.prev[s.strstart & s.w_mask] = s.head[s.ins_h];
|
|
s.head[s.ins_h] = s.strstart;
|
|
/***/
|
|
}
|
|
|
|
/* Find the longest match, discarding those <= prev_length.
|
|
* At this point we have always match_length < MIN_MATCH
|
|
*/
|
|
if (hash_head !== 0/*NIL*/ && ((s.strstart - hash_head) <= (s.w_size - MIN_LOOKAHEAD))) {
|
|
/* To simplify the code, we prevent matches with the string
|
|
* of window index 0 (in particular we have to avoid a match
|
|
* of the string with itself at the start of the input file).
|
|
*/
|
|
s.match_length = longest_match(s, hash_head);
|
|
/* longest_match() sets match_start */
|
|
}
|
|
if (s.match_length >= MIN_MATCH) {
|
|
// check_match(s, s.strstart, s.match_start, s.match_length); // for debug only
|
|
|
|
/*** _tr_tally_dist(s, s.strstart - s.match_start,
|
|
s.match_length - MIN_MATCH, bflush); ***/
|
|
bflush = trees._tr_tally(s, s.strstart - s.match_start, s.match_length - MIN_MATCH);
|
|
|
|
s.lookahead -= s.match_length;
|
|
|
|
/* Insert new strings in the hash table only if the match length
|
|
* is not too large. This saves time but degrades compression.
|
|
*/
|
|
if (s.match_length <= s.max_lazy_match/*max_insert_length*/ && s.lookahead >= MIN_MATCH) {
|
|
s.match_length--; /* string at strstart already in table */
|
|
do {
|
|
s.strstart++;
|
|
/*** INSERT_STRING(s, s.strstart, hash_head); ***/
|
|
s.ins_h = ((s.ins_h << s.hash_shift) ^ s.window[s.strstart + MIN_MATCH - 1]) & s.hash_mask;
|
|
hash_head = s.prev[s.strstart & s.w_mask] = s.head[s.ins_h];
|
|
s.head[s.ins_h] = s.strstart;
|
|
/***/
|
|
/* strstart never exceeds WSIZE-MAX_MATCH, so there are
|
|
* always MIN_MATCH bytes ahead.
|
|
*/
|
|
} while (--s.match_length !== 0);
|
|
s.strstart++;
|
|
} else
|
|
{
|
|
s.strstart += s.match_length;
|
|
s.match_length = 0;
|
|
s.ins_h = s.window[s.strstart];
|
|
/* UPDATE_HASH(s, s.ins_h, s.window[s.strstart+1]); */
|
|
s.ins_h = ((s.ins_h << s.hash_shift) ^ s.window[s.strstart + 1]) & s.hash_mask;
|
|
|
|
//#if MIN_MATCH != 3
|
|
// Call UPDATE_HASH() MIN_MATCH-3 more times
|
|
//#endif
|
|
/* If lookahead < MIN_MATCH, ins_h is garbage, but it does not
|
|
* matter since it will be recomputed at next deflate call.
|
|
*/
|
|
}
|
|
} else {
|
|
/* No match, output a literal byte */
|
|
//Tracevv((stderr,"%c", s.window[s.strstart]));
|
|
/*** _tr_tally_lit(s, s.window[s.strstart], bflush); ***/
|
|
bflush = trees._tr_tally(s, 0, s.window[s.strstart]);
|
|
|
|
s.lookahead--;
|
|
s.strstart++;
|
|
}
|
|
if (bflush) {
|
|
/*** FLUSH_BLOCK(s, 0); ***/
|
|
flush_block_only(s, false);
|
|
if (s.strm.avail_out === 0) {
|
|
return BS_NEED_MORE;
|
|
}
|
|
/***/
|
|
}
|
|
}
|
|
s.insert = ((s.strstart < (MIN_MATCH - 1)) ? s.strstart : MIN_MATCH - 1);
|
|
if (flush === Z_FINISH) {
|
|
/*** FLUSH_BLOCK(s, 1); ***/
|
|
flush_block_only(s, true);
|
|
if (s.strm.avail_out === 0) {
|
|
return BS_FINISH_STARTED;
|
|
}
|
|
/***/
|
|
return BS_FINISH_DONE;
|
|
}
|
|
if (s.last_lit) {
|
|
/*** FLUSH_BLOCK(s, 0); ***/
|
|
flush_block_only(s, false);
|
|
if (s.strm.avail_out === 0) {
|
|
return BS_NEED_MORE;
|
|
}
|
|
/***/
|
|
}
|
|
return BS_BLOCK_DONE;
|
|
}
|
|
|
|
/* ===========================================================================
|
|
* Same as above, but achieves better compression. We use a lazy
|
|
* evaluation for matches: a match is finally adopted only if there is
|
|
* no better match at the next window position.
|
|
*/
|
|
function deflate_slow(s, flush) {
|
|
var hash_head; /* head of hash chain */
|
|
var bflush; /* set if current block must be flushed */
|
|
|
|
var max_insert;
|
|
|
|
/* Process the input block. */
|
|
for (;;) {
|
|
/* Make sure that we always have enough lookahead, except
|
|
* at the end of the input file. We need MAX_MATCH bytes
|
|
* for the next match, plus MIN_MATCH bytes to insert the
|
|
* string following the next match.
|
|
*/
|
|
if (s.lookahead < MIN_LOOKAHEAD) {
|
|
fill_window(s);
|
|
if (s.lookahead < MIN_LOOKAHEAD && flush === Z_NO_FLUSH) {
|
|
return BS_NEED_MORE;
|
|
}
|
|
if (s.lookahead === 0) { break; } /* flush the current block */
|
|
}
|
|
|
|
/* Insert the string window[strstart .. strstart+2] in the
|
|
* dictionary, and set hash_head to the head of the hash chain:
|
|
*/
|
|
hash_head = 0/*NIL*/;
|
|
if (s.lookahead >= MIN_MATCH) {
|
|
/*** INSERT_STRING(s, s.strstart, hash_head); ***/
|
|
s.ins_h = ((s.ins_h << s.hash_shift) ^ s.window[s.strstart + MIN_MATCH - 1]) & s.hash_mask;
|
|
hash_head = s.prev[s.strstart & s.w_mask] = s.head[s.ins_h];
|
|
s.head[s.ins_h] = s.strstart;
|
|
/***/
|
|
}
|
|
|
|
/* Find the longest match, discarding those <= prev_length.
|
|
*/
|
|
s.prev_length = s.match_length;
|
|
s.prev_match = s.match_start;
|
|
s.match_length = MIN_MATCH - 1;
|
|
|
|
if (hash_head !== 0/*NIL*/ && s.prev_length < s.max_lazy_match &&
|
|
s.strstart - hash_head <= (s.w_size - MIN_LOOKAHEAD)/*MAX_DIST(s)*/) {
|
|
/* To simplify the code, we prevent matches with the string
|
|
* of window index 0 (in particular we have to avoid a match
|
|
* of the string with itself at the start of the input file).
|
|
*/
|
|
s.match_length = longest_match(s, hash_head);
|
|
/* longest_match() sets match_start */
|
|
|
|
if (s.match_length <= 5 &&
|
|
(s.strategy === Z_FILTERED || (s.match_length === MIN_MATCH && s.strstart - s.match_start > 4096/*TOO_FAR*/))) {
|
|
|
|
/* If prev_match is also MIN_MATCH, match_start is garbage
|
|
* but we will ignore the current match anyway.
|
|
*/
|
|
s.match_length = MIN_MATCH - 1;
|
|
}
|
|
}
|
|
/* If there was a match at the previous step and the current
|
|
* match is not better, output the previous match:
|
|
*/
|
|
if (s.prev_length >= MIN_MATCH && s.match_length <= s.prev_length) {
|
|
max_insert = s.strstart + s.lookahead - MIN_MATCH;
|
|
/* Do not insert strings in hash table beyond this. */
|
|
|
|
//check_match(s, s.strstart-1, s.prev_match, s.prev_length);
|
|
|
|
/***_tr_tally_dist(s, s.strstart - 1 - s.prev_match,
|
|
s.prev_length - MIN_MATCH, bflush);***/
|
|
bflush = trees._tr_tally(s, s.strstart - 1 - s.prev_match, s.prev_length - MIN_MATCH);
|
|
/* Insert in hash table all strings up to the end of the match.
|
|
* strstart-1 and strstart are already inserted. If there is not
|
|
* enough lookahead, the last two strings are not inserted in
|
|
* the hash table.
|
|
*/
|
|
s.lookahead -= s.prev_length - 1;
|
|
s.prev_length -= 2;
|
|
do {
|
|
if (++s.strstart <= max_insert) {
|
|
/*** INSERT_STRING(s, s.strstart, hash_head); ***/
|
|
s.ins_h = ((s.ins_h << s.hash_shift) ^ s.window[s.strstart + MIN_MATCH - 1]) & s.hash_mask;
|
|
hash_head = s.prev[s.strstart & s.w_mask] = s.head[s.ins_h];
|
|
s.head[s.ins_h] = s.strstart;
|
|
/***/
|
|
}
|
|
} while (--s.prev_length !== 0);
|
|
s.match_available = 0;
|
|
s.match_length = MIN_MATCH - 1;
|
|
s.strstart++;
|
|
|
|
if (bflush) {
|
|
/*** FLUSH_BLOCK(s, 0); ***/
|
|
flush_block_only(s, false);
|
|
if (s.strm.avail_out === 0) {
|
|
return BS_NEED_MORE;
|
|
}
|
|
/***/
|
|
}
|
|
|
|
} else if (s.match_available) {
|
|
/* If there was no match at the previous position, output a
|
|
* single literal. If there was a match but the current match
|
|
* is longer, truncate the previous match to a single literal.
|
|
*/
|
|
//Tracevv((stderr,"%c", s->window[s->strstart-1]));
|
|
/*** _tr_tally_lit(s, s.window[s.strstart-1], bflush); ***/
|
|
bflush = trees._tr_tally(s, 0, s.window[s.strstart - 1]);
|
|
|
|
if (bflush) {
|
|
/*** FLUSH_BLOCK_ONLY(s, 0) ***/
|
|
flush_block_only(s, false);
|
|
/***/
|
|
}
|
|
s.strstart++;
|
|
s.lookahead--;
|
|
if (s.strm.avail_out === 0) {
|
|
return BS_NEED_MORE;
|
|
}
|
|
} else {
|
|
/* There is no previous match to compare with, wait for
|
|
* the next step to decide.
|
|
*/
|
|
s.match_available = 1;
|
|
s.strstart++;
|
|
s.lookahead--;
|
|
}
|
|
}
|
|
//Assert (flush != Z_NO_FLUSH, "no flush?");
|
|
if (s.match_available) {
|
|
//Tracevv((stderr,"%c", s->window[s->strstart-1]));
|
|
/*** _tr_tally_lit(s, s.window[s.strstart-1], bflush); ***/
|
|
bflush = trees._tr_tally(s, 0, s.window[s.strstart - 1]);
|
|
|
|
s.match_available = 0;
|
|
}
|
|
s.insert = s.strstart < MIN_MATCH - 1 ? s.strstart : MIN_MATCH - 1;
|
|
if (flush === Z_FINISH) {
|
|
/*** FLUSH_BLOCK(s, 1); ***/
|
|
flush_block_only(s, true);
|
|
if (s.strm.avail_out === 0) {
|
|
return BS_FINISH_STARTED;
|
|
}
|
|
/***/
|
|
return BS_FINISH_DONE;
|
|
}
|
|
if (s.last_lit) {
|
|
/*** FLUSH_BLOCK(s, 0); ***/
|
|
flush_block_only(s, false);
|
|
if (s.strm.avail_out === 0) {
|
|
return BS_NEED_MORE;
|
|
}
|
|
/***/
|
|
}
|
|
|
|
return BS_BLOCK_DONE;
|
|
}
|
|
|
|
|
|
/* ===========================================================================
|
|
* For Z_RLE, simply look for runs of bytes, generate matches only of distance
|
|
* one. Do not maintain a hash table. (It will be regenerated if this run of
|
|
* deflate switches away from Z_RLE.)
|
|
*/
|
|
function deflate_rle(s, flush) {
|
|
var bflush; /* set if current block must be flushed */
|
|
var prev; /* byte at distance one to match */
|
|
var scan, strend; /* scan goes up to strend for length of run */
|
|
|
|
var _win = s.window;
|
|
|
|
for (;;) {
|
|
/* Make sure that we always have enough lookahead, except
|
|
* at the end of the input file. We need MAX_MATCH bytes
|
|
* for the longest run, plus one for the unrolled loop.
|
|
*/
|
|
if (s.lookahead <= MAX_MATCH) {
|
|
fill_window(s);
|
|
if (s.lookahead <= MAX_MATCH && flush === Z_NO_FLUSH) {
|
|
return BS_NEED_MORE;
|
|
}
|
|
if (s.lookahead === 0) { break; } /* flush the current block */
|
|
}
|
|
|
|
/* See how many times the previous byte repeats */
|
|
s.match_length = 0;
|
|
if (s.lookahead >= MIN_MATCH && s.strstart > 0) {
|
|
scan = s.strstart - 1;
|
|
prev = _win[scan];
|
|
if (prev === _win[++scan] && prev === _win[++scan] && prev === _win[++scan]) {
|
|
strend = s.strstart + MAX_MATCH;
|
|
do {
|
|
/*jshint noempty:false*/
|
|
} while (prev === _win[++scan] && prev === _win[++scan] &&
|
|
prev === _win[++scan] && prev === _win[++scan] &&
|
|
prev === _win[++scan] && prev === _win[++scan] &&
|
|
prev === _win[++scan] && prev === _win[++scan] &&
|
|
scan < strend);
|
|
s.match_length = MAX_MATCH - (strend - scan);
|
|
if (s.match_length > s.lookahead) {
|
|
s.match_length = s.lookahead;
|
|
}
|
|
}
|
|
//Assert(scan <= s->window+(uInt)(s->window_size-1), "wild scan");
|
|
}
|
|
|
|
/* Emit match if have run of MIN_MATCH or longer, else emit literal */
|
|
if (s.match_length >= MIN_MATCH) {
|
|
//check_match(s, s.strstart, s.strstart - 1, s.match_length);
|
|
|
|
/*** _tr_tally_dist(s, 1, s.match_length - MIN_MATCH, bflush); ***/
|
|
bflush = trees._tr_tally(s, 1, s.match_length - MIN_MATCH);
|
|
|
|
s.lookahead -= s.match_length;
|
|
s.strstart += s.match_length;
|
|
s.match_length = 0;
|
|
} else {
|
|
/* No match, output a literal byte */
|
|
//Tracevv((stderr,"%c", s->window[s->strstart]));
|
|
/*** _tr_tally_lit(s, s.window[s.strstart], bflush); ***/
|
|
bflush = trees._tr_tally(s, 0, s.window[s.strstart]);
|
|
|
|
s.lookahead--;
|
|
s.strstart++;
|
|
}
|
|
if (bflush) {
|
|
/*** FLUSH_BLOCK(s, 0); ***/
|
|
flush_block_only(s, false);
|
|
if (s.strm.avail_out === 0) {
|
|
return BS_NEED_MORE;
|
|
}
|
|
/***/
|
|
}
|
|
}
|
|
s.insert = 0;
|
|
if (flush === Z_FINISH) {
|
|
/*** FLUSH_BLOCK(s, 1); ***/
|
|
flush_block_only(s, true);
|
|
if (s.strm.avail_out === 0) {
|
|
return BS_FINISH_STARTED;
|
|
}
|
|
/***/
|
|
return BS_FINISH_DONE;
|
|
}
|
|
if (s.last_lit) {
|
|
/*** FLUSH_BLOCK(s, 0); ***/
|
|
flush_block_only(s, false);
|
|
if (s.strm.avail_out === 0) {
|
|
return BS_NEED_MORE;
|
|
}
|
|
/***/
|
|
}
|
|
return BS_BLOCK_DONE;
|
|
}
|
|
|
|
/* ===========================================================================
|
|
* For Z_HUFFMAN_ONLY, do not look for matches. Do not maintain a hash table.
|
|
* (It will be regenerated if this run of deflate switches away from Huffman.)
|
|
*/
|
|
function deflate_huff(s, flush) {
|
|
var bflush; /* set if current block must be flushed */
|
|
|
|
for (;;) {
|
|
/* Make sure that we have a literal to write. */
|
|
if (s.lookahead === 0) {
|
|
fill_window(s);
|
|
if (s.lookahead === 0) {
|
|
if (flush === Z_NO_FLUSH) {
|
|
return BS_NEED_MORE;
|
|
}
|
|
break; /* flush the current block */
|
|
}
|
|
}
|
|
|
|
/* Output a literal byte */
|
|
s.match_length = 0;
|
|
//Tracevv((stderr,"%c", s->window[s->strstart]));
|
|
/*** _tr_tally_lit(s, s.window[s.strstart], bflush); ***/
|
|
bflush = trees._tr_tally(s, 0, s.window[s.strstart]);
|
|
s.lookahead--;
|
|
s.strstart++;
|
|
if (bflush) {
|
|
/*** FLUSH_BLOCK(s, 0); ***/
|
|
flush_block_only(s, false);
|
|
if (s.strm.avail_out === 0) {
|
|
return BS_NEED_MORE;
|
|
}
|
|
/***/
|
|
}
|
|
}
|
|
s.insert = 0;
|
|
if (flush === Z_FINISH) {
|
|
/*** FLUSH_BLOCK(s, 1); ***/
|
|
flush_block_only(s, true);
|
|
if (s.strm.avail_out === 0) {
|
|
return BS_FINISH_STARTED;
|
|
}
|
|
/***/
|
|
return BS_FINISH_DONE;
|
|
}
|
|
if (s.last_lit) {
|
|
/*** FLUSH_BLOCK(s, 0); ***/
|
|
flush_block_only(s, false);
|
|
if (s.strm.avail_out === 0) {
|
|
return BS_NEED_MORE;
|
|
}
|
|
/***/
|
|
}
|
|
return BS_BLOCK_DONE;
|
|
}
|
|
|
|
/* Values for max_lazy_match, good_match and max_chain_length, depending on
|
|
* the desired pack level (0..9). The values given below have been tuned to
|
|
* exclude worst case performance for pathological files. Better values may be
|
|
* found for specific files.
|
|
*/
|
|
function Config(good_length, max_lazy, nice_length, max_chain, func) {
|
|
this.good_length = good_length;
|
|
this.max_lazy = max_lazy;
|
|
this.nice_length = nice_length;
|
|
this.max_chain = max_chain;
|
|
this.func = func;
|
|
}
|
|
|
|
var configuration_table;
|
|
|
|
configuration_table = [
|
|
/* good lazy nice chain */
|
|
new Config(0, 0, 0, 0, deflate_stored), /* 0 store only */
|
|
new Config(4, 4, 8, 4, deflate_fast), /* 1 max speed, no lazy matches */
|
|
new Config(4, 5, 16, 8, deflate_fast), /* 2 */
|
|
new Config(4, 6, 32, 32, deflate_fast), /* 3 */
|
|
|
|
new Config(4, 4, 16, 16, deflate_slow), /* 4 lazy matches */
|
|
new Config(8, 16, 32, 32, deflate_slow), /* 5 */
|
|
new Config(8, 16, 128, 128, deflate_slow), /* 6 */
|
|
new Config(8, 32, 128, 256, deflate_slow), /* 7 */
|
|
new Config(32, 128, 258, 1024, deflate_slow), /* 8 */
|
|
new Config(32, 258, 258, 4096, deflate_slow) /* 9 max compression */
|
|
];
|
|
|
|
|
|
/* ===========================================================================
|
|
* Initialize the "longest match" routines for a new zlib stream
|
|
*/
|
|
function lm_init(s) {
|
|
s.window_size = 2 * s.w_size;
|
|
|
|
/*** CLEAR_HASH(s); ***/
|
|
zero(s.head); // Fill with NIL (= 0);
|
|
|
|
/* Set the default configuration parameters:
|
|
*/
|
|
s.max_lazy_match = configuration_table[s.level].max_lazy;
|
|
s.good_match = configuration_table[s.level].good_length;
|
|
s.nice_match = configuration_table[s.level].nice_length;
|
|
s.max_chain_length = configuration_table[s.level].max_chain;
|
|
|
|
s.strstart = 0;
|
|
s.block_start = 0;
|
|
s.lookahead = 0;
|
|
s.insert = 0;
|
|
s.match_length = s.prev_length = MIN_MATCH - 1;
|
|
s.match_available = 0;
|
|
s.ins_h = 0;
|
|
}
|
|
|
|
|
|
function DeflateState() {
|
|
this.strm = null; /* pointer back to this zlib stream */
|
|
this.status = 0; /* as the name implies */
|
|
this.pending_buf = null; /* output still pending */
|
|
this.pending_buf_size = 0; /* size of pending_buf */
|
|
this.pending_out = 0; /* next pending byte to output to the stream */
|
|
this.pending = 0; /* nb of bytes in the pending buffer */
|
|
this.wrap = 0; /* bit 0 true for zlib, bit 1 true for gzip */
|
|
this.gzhead = null; /* gzip header information to write */
|
|
this.gzindex = 0; /* where in extra, name, or comment */
|
|
this.method = Z_DEFLATED; /* can only be DEFLATED */
|
|
this.last_flush = -1; /* value of flush param for previous deflate call */
|
|
|
|
this.w_size = 0; /* LZ77 window size (32K by default) */
|
|
this.w_bits = 0; /* log2(w_size) (8..16) */
|
|
this.w_mask = 0; /* w_size - 1 */
|
|
|
|
this.window = null;
|
|
/* Sliding window. Input bytes are read into the second half of the window,
|
|
* and move to the first half later to keep a dictionary of at least wSize
|
|
* bytes. With this organization, matches are limited to a distance of
|
|
* wSize-MAX_MATCH bytes, but this ensures that IO is always
|
|
* performed with a length multiple of the block size.
|
|
*/
|
|
|
|
this.window_size = 0;
|
|
/* Actual size of window: 2*wSize, except when the user input buffer
|
|
* is directly used as sliding window.
|
|
*/
|
|
|
|
this.prev = null;
|
|
/* Link to older string with same hash index. To limit the size of this
|
|
* array to 64K, this link is maintained only for the last 32K strings.
|
|
* An index in this array is thus a window index modulo 32K.
|
|
*/
|
|
|
|
this.head = null; /* Heads of the hash chains or NIL. */
|
|
|
|
this.ins_h = 0; /* hash index of string to be inserted */
|
|
this.hash_size = 0; /* number of elements in hash table */
|
|
this.hash_bits = 0; /* log2(hash_size) */
|
|
this.hash_mask = 0; /* hash_size-1 */
|
|
|
|
this.hash_shift = 0;
|
|
/* Number of bits by which ins_h must be shifted at each input
|
|
* step. It must be such that after MIN_MATCH steps, the oldest
|
|
* byte no longer takes part in the hash key, that is:
|
|
* hash_shift * MIN_MATCH >= hash_bits
|
|
*/
|
|
|
|
this.block_start = 0;
|
|
/* Window position at the beginning of the current output block. Gets
|
|
* negative when the window is moved backwards.
|
|
*/
|
|
|
|
this.match_length = 0; /* length of best match */
|
|
this.prev_match = 0; /* previous match */
|
|
this.match_available = 0; /* set if previous match exists */
|
|
this.strstart = 0; /* start of string to insert */
|
|
this.match_start = 0; /* start of matching string */
|
|
this.lookahead = 0; /* number of valid bytes ahead in window */
|
|
|
|
this.prev_length = 0;
|
|
/* Length of the best match at previous step. Matches not greater than this
|
|
* are discarded. This is used in the lazy match evaluation.
|
|
*/
|
|
|
|
this.max_chain_length = 0;
|
|
/* To speed up deflation, hash chains are never searched beyond this
|
|
* length. A higher limit improves compression ratio but degrades the
|
|
* speed.
|
|
*/
|
|
|
|
this.max_lazy_match = 0;
|
|
/* Attempt to find a better match only when the current match is strictly
|
|
* smaller than this value. This mechanism is used only for compression
|
|
* levels >= 4.
|
|
*/
|
|
// That's alias to max_lazy_match, don't use directly
|
|
//this.max_insert_length = 0;
|
|
/* Insert new strings in the hash table only if the match length is not
|
|
* greater than this length. This saves time but degrades compression.
|
|
* max_insert_length is used only for compression levels <= 3.
|
|
*/
|
|
|
|
this.level = 0; /* compression level (1..9) */
|
|
this.strategy = 0; /* favor or force Huffman coding*/
|
|
|
|
this.good_match = 0;
|
|
/* Use a faster search when the previous match is longer than this */
|
|
|
|
this.nice_match = 0; /* Stop searching when current match exceeds this */
|
|
|
|
/* used by trees.c: */
|
|
|
|
/* Didn't use ct_data typedef below to suppress compiler warning */
|
|
|
|
// struct ct_data_s dyn_ltree[HEAP_SIZE]; /* literal and length tree */
|
|
// struct ct_data_s dyn_dtree[2*D_CODES+1]; /* distance tree */
|
|
// struct ct_data_s bl_tree[2*BL_CODES+1]; /* Huffman tree for bit lengths */
|
|
|
|
// Use flat array of DOUBLE size, with interleaved fata,
|
|
// because JS does not support effective
|
|
this.dyn_ltree = new utils.Buf16(HEAP_SIZE * 2);
|
|
this.dyn_dtree = new utils.Buf16((2 * D_CODES + 1) * 2);
|
|
this.bl_tree = new utils.Buf16((2 * BL_CODES + 1) * 2);
|
|
zero(this.dyn_ltree);
|
|
zero(this.dyn_dtree);
|
|
zero(this.bl_tree);
|
|
|
|
this.l_desc = null; /* desc. for literal tree */
|
|
this.d_desc = null; /* desc. for distance tree */
|
|
this.bl_desc = null; /* desc. for bit length tree */
|
|
|
|
//ush bl_count[MAX_BITS+1];
|
|
this.bl_count = new utils.Buf16(MAX_BITS + 1);
|
|
/* number of codes at each bit length for an optimal tree */
|
|
|
|
//int heap[2*L_CODES+1]; /* heap used to build the Huffman trees */
|
|
this.heap = new utils.Buf16(2 * L_CODES + 1); /* heap used to build the Huffman trees */
|
|
zero(this.heap);
|
|
|
|
this.heap_len = 0; /* number of elements in the heap */
|
|
this.heap_max = 0; /* element of largest frequency */
|
|
/* The sons of heap[n] are heap[2*n] and heap[2*n+1]. heap[0] is not used.
|
|
* The same heap array is used to build all trees.
|
|
*/
|
|
|
|
this.depth = new utils.Buf16(2 * L_CODES + 1); //uch depth[2*L_CODES+1];
|
|
zero(this.depth);
|
|
/* Depth of each subtree used as tie breaker for trees of equal frequency
|
|
*/
|
|
|
|
this.l_buf = 0; /* buffer index for literals or lengths */
|
|
|
|
this.lit_bufsize = 0;
|
|
/* Size of match buffer for literals/lengths. There are 4 reasons for
|
|
* limiting lit_bufsize to 64K:
|
|
* - frequencies can be kept in 16 bit counters
|
|
* - if compression is not successful for the first block, all input
|
|
* data is still in the window so we can still emit a stored block even
|
|
* when input comes from standard input. (This can also be done for
|
|
* all blocks if lit_bufsize is not greater than 32K.)
|
|
* - if compression is not successful for a file smaller than 64K, we can
|
|
* even emit a stored file instead of a stored block (saving 5 bytes).
|
|
* This is applicable only for zip (not gzip or zlib).
|
|
* - creating new Huffman trees less frequently may not provide fast
|
|
* adaptation to changes in the input data statistics. (Take for
|
|
* example a binary file with poorly compressible code followed by
|
|
* a highly compressible string table.) Smaller buffer sizes give
|
|
* fast adaptation but have of course the overhead of transmitting
|
|
* trees more frequently.
|
|
* - I can't count above 4
|
|
*/
|
|
|
|
this.last_lit = 0; /* running index in l_buf */
|
|
|
|
this.d_buf = 0;
|
|
/* Buffer index for distances. To simplify the code, d_buf and l_buf have
|
|
* the same number of elements. To use different lengths, an extra flag
|
|
* array would be necessary.
|
|
*/
|
|
|
|
this.opt_len = 0; /* bit length of current block with optimal trees */
|
|
this.static_len = 0; /* bit length of current block with static trees */
|
|
this.matches = 0; /* number of string matches in current block */
|
|
this.insert = 0; /* bytes at end of window left to insert */
|
|
|
|
|
|
this.bi_buf = 0;
|
|
/* Output buffer. bits are inserted starting at the bottom (least
|
|
* significant bits).
|
|
*/
|
|
this.bi_valid = 0;
|
|
/* Number of valid bits in bi_buf. All bits above the last valid bit
|
|
* are always zero.
|
|
*/
|
|
|
|
// Used for window memory init. We safely ignore it for JS. That makes
|
|
// sense only for pointers and memory check tools.
|
|
//this.high_water = 0;
|
|
/* High water mark offset in window for initialized bytes -- bytes above
|
|
* this are set to zero in order to avoid memory check warnings when
|
|
* longest match routines access bytes past the input. This is then
|
|
* updated to the new high water mark.
|
|
*/
|
|
}
|
|
|
|
|
|
function deflateResetKeep(strm) {
|
|
var s;
|
|
|
|
if (!strm || !strm.state) {
|
|
return err(strm, Z_STREAM_ERROR);
|
|
}
|
|
|
|
strm.total_in = strm.total_out = 0;
|
|
strm.data_type = Z_UNKNOWN;
|
|
|
|
s = strm.state;
|
|
s.pending = 0;
|
|
s.pending_out = 0;
|
|
|
|
if (s.wrap < 0) {
|
|
s.wrap = -s.wrap;
|
|
/* was made negative by deflate(..., Z_FINISH); */
|
|
}
|
|
s.status = (s.wrap ? INIT_STATE : BUSY_STATE);
|
|
strm.adler = (s.wrap === 2) ?
|
|
0 // crc32(0, Z_NULL, 0)
|
|
:
|
|
1; // adler32(0, Z_NULL, 0)
|
|
s.last_flush = Z_NO_FLUSH;
|
|
trees._tr_init(s);
|
|
return Z_OK;
|
|
}
|
|
|
|
|
|
function deflateReset(strm) {
|
|
var ret = deflateResetKeep(strm);
|
|
if (ret === Z_OK) {
|
|
lm_init(strm.state);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
|
|
function deflateSetHeader(strm, head) {
|
|
if (!strm || !strm.state) { return Z_STREAM_ERROR; }
|
|
if (strm.state.wrap !== 2) { return Z_STREAM_ERROR; }
|
|
strm.state.gzhead = head;
|
|
return Z_OK;
|
|
}
|
|
|
|
|
|
function deflateInit2(strm, level, method, windowBits, memLevel, strategy) {
|
|
if (!strm) { // === Z_NULL
|
|
return Z_STREAM_ERROR;
|
|
}
|
|
var wrap = 1;
|
|
|
|
if (level === Z_DEFAULT_COMPRESSION) {
|
|
level = 6;
|
|
}
|
|
|
|
if (windowBits < 0) { /* suppress zlib wrapper */
|
|
wrap = 0;
|
|
windowBits = -windowBits;
|
|
}
|
|
|
|
else if (windowBits > 15) {
|
|
wrap = 2; /* write gzip wrapper instead */
|
|
windowBits -= 16;
|
|
}
|
|
|
|
|
|
if (memLevel < 1 || memLevel > MAX_MEM_LEVEL || method !== Z_DEFLATED ||
|
|
windowBits < 8 || windowBits > 15 || level < 0 || level > 9 ||
|
|
strategy < 0 || strategy > Z_FIXED) {
|
|
return err(strm, Z_STREAM_ERROR);
|
|
}
|
|
|
|
|
|
if (windowBits === 8) {
|
|
windowBits = 9;
|
|
}
|
|
/* until 256-byte window bug fixed */
|
|
|
|
var s = new DeflateState();
|
|
|
|
strm.state = s;
|
|
s.strm = strm;
|
|
|
|
s.wrap = wrap;
|
|
s.gzhead = null;
|
|
s.w_bits = windowBits;
|
|
s.w_size = 1 << s.w_bits;
|
|
s.w_mask = s.w_size - 1;
|
|
|
|
s.hash_bits = memLevel + 7;
|
|
s.hash_size = 1 << s.hash_bits;
|
|
s.hash_mask = s.hash_size - 1;
|
|
s.hash_shift = ~~((s.hash_bits + MIN_MATCH - 1) / MIN_MATCH);
|
|
|
|
s.window = new utils.Buf8(s.w_size * 2);
|
|
s.head = new utils.Buf16(s.hash_size);
|
|
s.prev = new utils.Buf16(s.w_size);
|
|
|
|
// Don't need mem init magic for JS.
|
|
//s.high_water = 0; /* nothing written to s->window yet */
|
|
|
|
s.lit_bufsize = 1 << (memLevel + 6); /* 16K elements by default */
|
|
|
|
s.pending_buf_size = s.lit_bufsize * 4;
|
|
|
|
//overlay = (ushf *) ZALLOC(strm, s->lit_bufsize, sizeof(ush)+2);
|
|
//s->pending_buf = (uchf *) overlay;
|
|
s.pending_buf = new utils.Buf8(s.pending_buf_size);
|
|
|
|
// It is offset from `s.pending_buf` (size is `s.lit_bufsize * 2`)
|
|
//s->d_buf = overlay + s->lit_bufsize/sizeof(ush);
|
|
s.d_buf = 1 * s.lit_bufsize;
|
|
|
|
//s->l_buf = s->pending_buf + (1+sizeof(ush))*s->lit_bufsize;
|
|
s.l_buf = (1 + 2) * s.lit_bufsize;
|
|
|
|
s.level = level;
|
|
s.strategy = strategy;
|
|
s.method = method;
|
|
|
|
return deflateReset(strm);
|
|
}
|
|
|
|
function deflateInit(strm, level) {
|
|
return deflateInit2(strm, level, Z_DEFLATED, MAX_WBITS, DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY);
|
|
}
|
|
|
|
|
|
function deflate(strm, flush) {
|
|
var old_flush, s;
|
|
var beg, val; // for gzip header write only
|
|
|
|
if (!strm || !strm.state ||
|
|
flush > Z_BLOCK || flush < 0) {
|
|
return strm ? err(strm, Z_STREAM_ERROR) : Z_STREAM_ERROR;
|
|
}
|
|
|
|
s = strm.state;
|
|
|
|
if (!strm.output ||
|
|
(!strm.input && strm.avail_in !== 0) ||
|
|
(s.status === FINISH_STATE && flush !== Z_FINISH)) {
|
|
return err(strm, (strm.avail_out === 0) ? Z_BUF_ERROR : Z_STREAM_ERROR);
|
|
}
|
|
|
|
s.strm = strm; /* just in case */
|
|
old_flush = s.last_flush;
|
|
s.last_flush = flush;
|
|
|
|
/* Write the header */
|
|
if (s.status === INIT_STATE) {
|
|
|
|
if (s.wrap === 2) { // GZIP header
|
|
strm.adler = 0; //crc32(0L, Z_NULL, 0);
|
|
put_byte(s, 31);
|
|
put_byte(s, 139);
|
|
put_byte(s, 8);
|
|
if (!s.gzhead) { // s->gzhead == Z_NULL
|
|
put_byte(s, 0);
|
|
put_byte(s, 0);
|
|
put_byte(s, 0);
|
|
put_byte(s, 0);
|
|
put_byte(s, 0);
|
|
put_byte(s, s.level === 9 ? 2 :
|
|
(s.strategy >= Z_HUFFMAN_ONLY || s.level < 2 ?
|
|
4 : 0));
|
|
put_byte(s, OS_CODE);
|
|
s.status = BUSY_STATE;
|
|
}
|
|
else {
|
|
put_byte(s, (s.gzhead.text ? 1 : 0) +
|
|
(s.gzhead.hcrc ? 2 : 0) +
|
|
(!s.gzhead.extra ? 0 : 4) +
|
|
(!s.gzhead.name ? 0 : 8) +
|
|
(!s.gzhead.comment ? 0 : 16)
|
|
);
|
|
put_byte(s, s.gzhead.time & 0xff);
|
|
put_byte(s, (s.gzhead.time >> 8) & 0xff);
|
|
put_byte(s, (s.gzhead.time >> 16) & 0xff);
|
|
put_byte(s, (s.gzhead.time >> 24) & 0xff);
|
|
put_byte(s, s.level === 9 ? 2 :
|
|
(s.strategy >= Z_HUFFMAN_ONLY || s.level < 2 ?
|
|
4 : 0));
|
|
put_byte(s, s.gzhead.os & 0xff);
|
|
if (s.gzhead.extra && s.gzhead.extra.length) {
|
|
put_byte(s, s.gzhead.extra.length & 0xff);
|
|
put_byte(s, (s.gzhead.extra.length >> 8) & 0xff);
|
|
}
|
|
if (s.gzhead.hcrc) {
|
|
strm.adler = crc32(strm.adler, s.pending_buf, s.pending, 0);
|
|
}
|
|
s.gzindex = 0;
|
|
s.status = EXTRA_STATE;
|
|
}
|
|
}
|
|
else // DEFLATE header
|
|
{
|
|
var header = (Z_DEFLATED + ((s.w_bits - 8) << 4)) << 8;
|
|
var level_flags = -1;
|
|
|
|
if (s.strategy >= Z_HUFFMAN_ONLY || s.level < 2) {
|
|
level_flags = 0;
|
|
} else if (s.level < 6) {
|
|
level_flags = 1;
|
|
} else if (s.level === 6) {
|
|
level_flags = 2;
|
|
} else {
|
|
level_flags = 3;
|
|
}
|
|
header |= (level_flags << 6);
|
|
if (s.strstart !== 0) { header |= PRESET_DICT; }
|
|
header += 31 - (header % 31);
|
|
|
|
s.status = BUSY_STATE;
|
|
putShortMSB(s, header);
|
|
|
|
/* Save the adler32 of the preset dictionary: */
|
|
if (s.strstart !== 0) {
|
|
putShortMSB(s, strm.adler >>> 16);
|
|
putShortMSB(s, strm.adler & 0xffff);
|
|
}
|
|
strm.adler = 1; // adler32(0L, Z_NULL, 0);
|
|
}
|
|
}
|
|
|
|
//#ifdef GZIP
|
|
if (s.status === EXTRA_STATE) {
|
|
if (s.gzhead.extra/* != Z_NULL*/) {
|
|
beg = s.pending; /* start of bytes to update crc */
|
|
|
|
while (s.gzindex < (s.gzhead.extra.length & 0xffff)) {
|
|
if (s.pending === s.pending_buf_size) {
|
|
if (s.gzhead.hcrc && s.pending > beg) {
|
|
strm.adler = crc32(strm.adler, s.pending_buf, s.pending - beg, beg);
|
|
}
|
|
flush_pending(strm);
|
|
beg = s.pending;
|
|
if (s.pending === s.pending_buf_size) {
|
|
break;
|
|
}
|
|
}
|
|
put_byte(s, s.gzhead.extra[s.gzindex] & 0xff);
|
|
s.gzindex++;
|
|
}
|
|
if (s.gzhead.hcrc && s.pending > beg) {
|
|
strm.adler = crc32(strm.adler, s.pending_buf, s.pending - beg, beg);
|
|
}
|
|
if (s.gzindex === s.gzhead.extra.length) {
|
|
s.gzindex = 0;
|
|
s.status = NAME_STATE;
|
|
}
|
|
}
|
|
else {
|
|
s.status = NAME_STATE;
|
|
}
|
|
}
|
|
if (s.status === NAME_STATE) {
|
|
if (s.gzhead.name/* != Z_NULL*/) {
|
|
beg = s.pending; /* start of bytes to update crc */
|
|
//int val;
|
|
|
|
do {
|
|
if (s.pending === s.pending_buf_size) {
|
|
if (s.gzhead.hcrc && s.pending > beg) {
|
|
strm.adler = crc32(strm.adler, s.pending_buf, s.pending - beg, beg);
|
|
}
|
|
flush_pending(strm);
|
|
beg = s.pending;
|
|
if (s.pending === s.pending_buf_size) {
|
|
val = 1;
|
|
break;
|
|
}
|
|
}
|
|
// JS specific: little magic to add zero terminator to end of string
|
|
if (s.gzindex < s.gzhead.name.length) {
|
|
val = s.gzhead.name.charCodeAt(s.gzindex++) & 0xff;
|
|
} else {
|
|
val = 0;
|
|
}
|
|
put_byte(s, val);
|
|
} while (val !== 0);
|
|
|
|
if (s.gzhead.hcrc && s.pending > beg) {
|
|
strm.adler = crc32(strm.adler, s.pending_buf, s.pending - beg, beg);
|
|
}
|
|
if (val === 0) {
|
|
s.gzindex = 0;
|
|
s.status = COMMENT_STATE;
|
|
}
|
|
}
|
|
else {
|
|
s.status = COMMENT_STATE;
|
|
}
|
|
}
|
|
if (s.status === COMMENT_STATE) {
|
|
if (s.gzhead.comment/* != Z_NULL*/) {
|
|
beg = s.pending; /* start of bytes to update crc */
|
|
//int val;
|
|
|
|
do {
|
|
if (s.pending === s.pending_buf_size) {
|
|
if (s.gzhead.hcrc && s.pending > beg) {
|
|
strm.adler = crc32(strm.adler, s.pending_buf, s.pending - beg, beg);
|
|
}
|
|
flush_pending(strm);
|
|
beg = s.pending;
|
|
if (s.pending === s.pending_buf_size) {
|
|
val = 1;
|
|
break;
|
|
}
|
|
}
|
|
// JS specific: little magic to add zero terminator to end of string
|
|
if (s.gzindex < s.gzhead.comment.length) {
|
|
val = s.gzhead.comment.charCodeAt(s.gzindex++) & 0xff;
|
|
} else {
|
|
val = 0;
|
|
}
|
|
put_byte(s, val);
|
|
} while (val !== 0);
|
|
|
|
if (s.gzhead.hcrc && s.pending > beg) {
|
|
strm.adler = crc32(strm.adler, s.pending_buf, s.pending - beg, beg);
|
|
}
|
|
if (val === 0) {
|
|
s.status = HCRC_STATE;
|
|
}
|
|
}
|
|
else {
|
|
s.status = HCRC_STATE;
|
|
}
|
|
}
|
|
if (s.status === HCRC_STATE) {
|
|
if (s.gzhead.hcrc) {
|
|
if (s.pending + 2 > s.pending_buf_size) {
|
|
flush_pending(strm);
|
|
}
|
|
if (s.pending + 2 <= s.pending_buf_size) {
|
|
put_byte(s, strm.adler & 0xff);
|
|
put_byte(s, (strm.adler >> 8) & 0xff);
|
|
strm.adler = 0; //crc32(0L, Z_NULL, 0);
|
|
s.status = BUSY_STATE;
|
|
}
|
|
}
|
|
else {
|
|
s.status = BUSY_STATE;
|
|
}
|
|
}
|
|
//#endif
|
|
|
|
/* Flush as much pending output as possible */
|
|
if (s.pending !== 0) {
|
|
flush_pending(strm);
|
|
if (strm.avail_out === 0) {
|
|
/* Since avail_out is 0, deflate will be called again with
|
|
* more output space, but possibly with both pending and
|
|
* avail_in equal to zero. There won't be anything to do,
|
|
* but this is not an error situation so make sure we
|
|
* return OK instead of BUF_ERROR at next call of deflate:
|
|
*/
|
|
s.last_flush = -1;
|
|
return Z_OK;
|
|
}
|
|
|
|
/* Make sure there is something to do and avoid duplicate consecutive
|
|
* flushes. For repeated and useless calls with Z_FINISH, we keep
|
|
* returning Z_STREAM_END instead of Z_BUF_ERROR.
|
|
*/
|
|
} else if (strm.avail_in === 0 && rank(flush) <= rank(old_flush) &&
|
|
flush !== Z_FINISH) {
|
|
return err(strm, Z_BUF_ERROR);
|
|
}
|
|
|
|
/* User must not provide more input after the first FINISH: */
|
|
if (s.status === FINISH_STATE && strm.avail_in !== 0) {
|
|
return err(strm, Z_BUF_ERROR);
|
|
}
|
|
|
|
/* Start a new block or continue the current one.
|
|
*/
|
|
if (strm.avail_in !== 0 || s.lookahead !== 0 ||
|
|
(flush !== Z_NO_FLUSH && s.status !== FINISH_STATE)) {
|
|
var bstate = (s.strategy === Z_HUFFMAN_ONLY) ? deflate_huff(s, flush) :
|
|
(s.strategy === Z_RLE ? deflate_rle(s, flush) :
|
|
configuration_table[s.level].func(s, flush));
|
|
|
|
if (bstate === BS_FINISH_STARTED || bstate === BS_FINISH_DONE) {
|
|
s.status = FINISH_STATE;
|
|
}
|
|
if (bstate === BS_NEED_MORE || bstate === BS_FINISH_STARTED) {
|
|
if (strm.avail_out === 0) {
|
|
s.last_flush = -1;
|
|
/* avoid BUF_ERROR next call, see above */
|
|
}
|
|
return Z_OK;
|
|
/* If flush != Z_NO_FLUSH && avail_out == 0, the next call
|
|
* of deflate should use the same flush parameter to make sure
|
|
* that the flush is complete. So we don't have to output an
|
|
* empty block here, this will be done at next call. This also
|
|
* ensures that for a very small output buffer, we emit at most
|
|
* one empty block.
|
|
*/
|
|
}
|
|
if (bstate === BS_BLOCK_DONE) {
|
|
if (flush === Z_PARTIAL_FLUSH) {
|
|
trees._tr_align(s);
|
|
}
|
|
else if (flush !== Z_BLOCK) { /* FULL_FLUSH or SYNC_FLUSH */
|
|
|
|
trees._tr_stored_block(s, 0, 0, false);
|
|
/* For a full flush, this empty block will be recognized
|
|
* as a special marker by inflate_sync().
|
|
*/
|
|
if (flush === Z_FULL_FLUSH) {
|
|
/*** CLEAR_HASH(s); ***/ /* forget history */
|
|
zero(s.head); // Fill with NIL (= 0);
|
|
|
|
if (s.lookahead === 0) {
|
|
s.strstart = 0;
|
|
s.block_start = 0;
|
|
s.insert = 0;
|
|
}
|
|
}
|
|
}
|
|
flush_pending(strm);
|
|
if (strm.avail_out === 0) {
|
|
s.last_flush = -1; /* avoid BUF_ERROR at next call, see above */
|
|
return Z_OK;
|
|
}
|
|
}
|
|
}
|
|
//Assert(strm->avail_out > 0, "bug2");
|
|
//if (strm.avail_out <= 0) { throw new Error("bug2");}
|
|
|
|
if (flush !== Z_FINISH) { return Z_OK; }
|
|
if (s.wrap <= 0) { return Z_STREAM_END; }
|
|
|
|
/* Write the trailer */
|
|
if (s.wrap === 2) {
|
|
put_byte(s, strm.adler & 0xff);
|
|
put_byte(s, (strm.adler >> 8) & 0xff);
|
|
put_byte(s, (strm.adler >> 16) & 0xff);
|
|
put_byte(s, (strm.adler >> 24) & 0xff);
|
|
put_byte(s, strm.total_in & 0xff);
|
|
put_byte(s, (strm.total_in >> 8) & 0xff);
|
|
put_byte(s, (strm.total_in >> 16) & 0xff);
|
|
put_byte(s, (strm.total_in >> 24) & 0xff);
|
|
}
|
|
else
|
|
{
|
|
putShortMSB(s, strm.adler >>> 16);
|
|
putShortMSB(s, strm.adler & 0xffff);
|
|
}
|
|
|
|
flush_pending(strm);
|
|
/* If avail_out is zero, the application will call deflate again
|
|
* to flush the rest.
|
|
*/
|
|
if (s.wrap > 0) { s.wrap = -s.wrap; }
|
|
/* write the trailer only once! */
|
|
return s.pending !== 0 ? Z_OK : Z_STREAM_END;
|
|
}
|
|
|
|
function deflateEnd(strm) {
|
|
var status;
|
|
|
|
if (!strm/*== Z_NULL*/ || !strm.state/*== Z_NULL*/) {
|
|
return Z_STREAM_ERROR;
|
|
}
|
|
|
|
status = strm.state.status;
|
|
if (status !== INIT_STATE &&
|
|
status !== EXTRA_STATE &&
|
|
status !== NAME_STATE &&
|
|
status !== COMMENT_STATE &&
|
|
status !== HCRC_STATE &&
|
|
status !== BUSY_STATE &&
|
|
status !== FINISH_STATE
|
|
) {
|
|
return err(strm, Z_STREAM_ERROR);
|
|
}
|
|
|
|
strm.state = null;
|
|
|
|
return status === BUSY_STATE ? err(strm, Z_DATA_ERROR) : Z_OK;
|
|
}
|
|
|
|
|
|
/* =========================================================================
|
|
* Initializes the compression dictionary from the given byte
|
|
* sequence without producing any compressed output.
|
|
*/
|
|
function deflateSetDictionary(strm, dictionary) {
|
|
var dictLength = dictionary.length;
|
|
|
|
var s;
|
|
var str, n;
|
|
var wrap;
|
|
var avail;
|
|
var next;
|
|
var input;
|
|
var tmpDict;
|
|
|
|
if (!strm/*== Z_NULL*/ || !strm.state/*== Z_NULL*/) {
|
|
return Z_STREAM_ERROR;
|
|
}
|
|
|
|
s = strm.state;
|
|
wrap = s.wrap;
|
|
|
|
if (wrap === 2 || (wrap === 1 && s.status !== INIT_STATE) || s.lookahead) {
|
|
return Z_STREAM_ERROR;
|
|
}
|
|
|
|
/* when using zlib wrappers, compute Adler-32 for provided dictionary */
|
|
if (wrap === 1) {
|
|
/* adler32(strm->adler, dictionary, dictLength); */
|
|
strm.adler = adler32(strm.adler, dictionary, dictLength, 0);
|
|
}
|
|
|
|
s.wrap = 0; /* avoid computing Adler-32 in read_buf */
|
|
|
|
/* if dictionary would fill window, just replace the history */
|
|
if (dictLength >= s.w_size) {
|
|
if (wrap === 0) { /* already empty otherwise */
|
|
/*** CLEAR_HASH(s); ***/
|
|
zero(s.head); // Fill with NIL (= 0);
|
|
s.strstart = 0;
|
|
s.block_start = 0;
|
|
s.insert = 0;
|
|
}
|
|
/* use the tail */
|
|
// dictionary = dictionary.slice(dictLength - s.w_size);
|
|
tmpDict = new utils.Buf8(s.w_size);
|
|
utils.arraySet(tmpDict, dictionary, dictLength - s.w_size, s.w_size, 0);
|
|
dictionary = tmpDict;
|
|
dictLength = s.w_size;
|
|
}
|
|
/* insert dictionary into window and hash */
|
|
avail = strm.avail_in;
|
|
next = strm.next_in;
|
|
input = strm.input;
|
|
strm.avail_in = dictLength;
|
|
strm.next_in = 0;
|
|
strm.input = dictionary;
|
|
fill_window(s);
|
|
while (s.lookahead >= MIN_MATCH) {
|
|
str = s.strstart;
|
|
n = s.lookahead - (MIN_MATCH - 1);
|
|
do {
|
|
/* UPDATE_HASH(s, s->ins_h, s->window[str + MIN_MATCH-1]); */
|
|
s.ins_h = ((s.ins_h << s.hash_shift) ^ s.window[str + MIN_MATCH - 1]) & s.hash_mask;
|
|
|
|
s.prev[str & s.w_mask] = s.head[s.ins_h];
|
|
|
|
s.head[s.ins_h] = str;
|
|
str++;
|
|
} while (--n);
|
|
s.strstart = str;
|
|
s.lookahead = MIN_MATCH - 1;
|
|
fill_window(s);
|
|
}
|
|
s.strstart += s.lookahead;
|
|
s.block_start = s.strstart;
|
|
s.insert = s.lookahead;
|
|
s.lookahead = 0;
|
|
s.match_length = s.prev_length = MIN_MATCH - 1;
|
|
s.match_available = 0;
|
|
strm.next_in = next;
|
|
strm.input = input;
|
|
strm.avail_in = avail;
|
|
s.wrap = wrap;
|
|
return Z_OK;
|
|
}
|
|
|
|
|
|
exports.deflateInit = deflateInit;
|
|
exports.deflateInit2 = deflateInit2;
|
|
exports.deflateReset = deflateReset;
|
|
exports.deflateResetKeep = deflateResetKeep;
|
|
exports.deflateSetHeader = deflateSetHeader;
|
|
exports.deflate = deflate;
|
|
exports.deflateEnd = deflateEnd;
|
|
exports.deflateSetDictionary = deflateSetDictionary;
|
|
exports.deflateInfo = 'pako deflate (from Nodeca project)';
|
|
|
|
/* Not implemented
|
|
exports.deflateBound = deflateBound;
|
|
exports.deflateCopy = deflateCopy;
|
|
exports.deflateParams = deflateParams;
|
|
exports.deflatePending = deflatePending;
|
|
exports.deflatePrime = deflatePrime;
|
|
exports.deflateTune = deflateTune;
|
|
*/
|
|
|
|
},{"../utils/common":1,"./adler32":3,"./crc32":4,"./messages":6,"./trees":7}],6:[function(require,module,exports){
|
|
'use strict';
|
|
|
|
// (C) 1995-2013 Jean-loup Gailly and Mark Adler
|
|
// (C) 2014-2017 Vitaly Puzrin and Andrey Tupitsin
|
|
//
|
|
// This software is provided 'as-is', without any express or implied
|
|
// warranty. In no event will the authors be held liable for any damages
|
|
// arising from the use of this software.
|
|
//
|
|
// Permission is granted to anyone to use this software for any purpose,
|
|
// including commercial applications, and to alter it and redistribute it
|
|
// freely, subject to the following restrictions:
|
|
//
|
|
// 1. The origin of this software must not be misrepresented; you must not
|
|
// claim that you wrote the original software. If you use this software
|
|
// in a product, an acknowledgment in the product documentation would be
|
|
// appreciated but is not required.
|
|
// 2. Altered source versions must be plainly marked as such, and must not be
|
|
// misrepresented as being the original software.
|
|
// 3. This notice may not be removed or altered from any source distribution.
|
|
|
|
module.exports = {
|
|
2: 'need dictionary', /* Z_NEED_DICT 2 */
|
|
1: 'stream end', /* Z_STREAM_END 1 */
|
|
0: '', /* Z_OK 0 */
|
|
'-1': 'file error', /* Z_ERRNO (-1) */
|
|
'-2': 'stream error', /* Z_STREAM_ERROR (-2) */
|
|
'-3': 'data error', /* Z_DATA_ERROR (-3) */
|
|
'-4': 'insufficient memory', /* Z_MEM_ERROR (-4) */
|
|
'-5': 'buffer error', /* Z_BUF_ERROR (-5) */
|
|
'-6': 'incompatible version' /* Z_VERSION_ERROR (-6) */
|
|
};
|
|
|
|
},{}],7:[function(require,module,exports){
|
|
'use strict';
|
|
|
|
// (C) 1995-2013 Jean-loup Gailly and Mark Adler
|
|
// (C) 2014-2017 Vitaly Puzrin and Andrey Tupitsin
|
|
//
|
|
// This software is provided 'as-is', without any express or implied
|
|
// warranty. In no event will the authors be held liable for any damages
|
|
// arising from the use of this software.
|
|
//
|
|
// Permission is granted to anyone to use this software for any purpose,
|
|
// including commercial applications, and to alter it and redistribute it
|
|
// freely, subject to the following restrictions:
|
|
//
|
|
// 1. The origin of this software must not be misrepresented; you must not
|
|
// claim that you wrote the original software. If you use this software
|
|
// in a product, an acknowledgment in the product documentation would be
|
|
// appreciated but is not required.
|
|
// 2. Altered source versions must be plainly marked as such, and must not be
|
|
// misrepresented as being the original software.
|
|
// 3. This notice may not be removed or altered from any source distribution.
|
|
|
|
var utils = require('../utils/common');
|
|
|
|
/* Public constants ==========================================================*/
|
|
/* ===========================================================================*/
|
|
|
|
|
|
//var Z_FILTERED = 1;
|
|
//var Z_HUFFMAN_ONLY = 2;
|
|
//var Z_RLE = 3;
|
|
var Z_FIXED = 4;
|
|
//var Z_DEFAULT_STRATEGY = 0;
|
|
|
|
/* Possible values of the data_type field (though see inflate()) */
|
|
var Z_BINARY = 0;
|
|
var Z_TEXT = 1;
|
|
//var Z_ASCII = 1; // = Z_TEXT
|
|
var Z_UNKNOWN = 2;
|
|
|
|
/*============================================================================*/
|
|
|
|
|
|
function zero(buf) { var len = buf.length; while (--len >= 0) { buf[len] = 0; } }
|
|
|
|
// From zutil.h
|
|
|
|
var STORED_BLOCK = 0;
|
|
var STATIC_TREES = 1;
|
|
var DYN_TREES = 2;
|
|
/* The three kinds of block type */
|
|
|
|
var MIN_MATCH = 3;
|
|
var MAX_MATCH = 258;
|
|
/* The minimum and maximum match lengths */
|
|
|
|
// From deflate.h
|
|
/* ===========================================================================
|
|
* Internal compression state.
|
|
*/
|
|
|
|
var LENGTH_CODES = 29;
|
|
/* number of length codes, not counting the special END_BLOCK code */
|
|
|
|
var LITERALS = 256;
|
|
/* number of literal bytes 0..255 */
|
|
|
|
var L_CODES = LITERALS + 1 + LENGTH_CODES;
|
|
/* number of Literal or Length codes, including the END_BLOCK code */
|
|
|
|
var D_CODES = 30;
|
|
/* number of distance codes */
|
|
|
|
var BL_CODES = 19;
|
|
/* number of codes used to transfer the bit lengths */
|
|
|
|
var HEAP_SIZE = 2 * L_CODES + 1;
|
|
/* maximum heap size */
|
|
|
|
var MAX_BITS = 15;
|
|
/* All codes must not exceed MAX_BITS bits */
|
|
|
|
var Buf_size = 16;
|
|
/* size of bit buffer in bi_buf */
|
|
|
|
|
|
/* ===========================================================================
|
|
* Constants
|
|
*/
|
|
|
|
var MAX_BL_BITS = 7;
|
|
/* Bit length codes must not exceed MAX_BL_BITS bits */
|
|
|
|
var END_BLOCK = 256;
|
|
/* end of block literal code */
|
|
|
|
var REP_3_6 = 16;
|
|
/* repeat previous bit length 3-6 times (2 bits of repeat count) */
|
|
|
|
var REPZ_3_10 = 17;
|
|
/* repeat a zero length 3-10 times (3 bits of repeat count) */
|
|
|
|
var REPZ_11_138 = 18;
|
|
/* repeat a zero length 11-138 times (7 bits of repeat count) */
|
|
|
|
/* eslint-disable comma-spacing,array-bracket-spacing */
|
|
var extra_lbits = /* extra bits for each length code */
|
|
[0,0,0,0,0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,0];
|
|
|
|
var extra_dbits = /* extra bits for each distance code */
|
|
[0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13];
|
|
|
|
var extra_blbits = /* extra bits for each bit length code */
|
|
[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2,3,7];
|
|
|
|
var bl_order =
|
|
[16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15];
|
|
/* eslint-enable comma-spacing,array-bracket-spacing */
|
|
|
|
/* The lengths of the bit length codes are sent in order of decreasing
|
|
* probability, to avoid transmitting the lengths for unused bit length codes.
|
|
*/
|
|
|
|
/* ===========================================================================
|
|
* Local data. These are initialized only once.
|
|
*/
|
|
|
|
// We pre-fill arrays with 0 to avoid uninitialized gaps
|
|
|
|
var DIST_CODE_LEN = 512; /* see definition of array dist_code below */
|
|
|
|
// !!!! Use flat array instead of structure, Freq = i*2, Len = i*2+1
|
|
var static_ltree = new Array((L_CODES + 2) * 2);
|
|
zero(static_ltree);
|
|
/* The static literal tree. Since the bit lengths are imposed, there is no
|
|
* need for the L_CODES extra codes used during heap construction. However
|
|
* The codes 286 and 287 are needed to build a canonical tree (see _tr_init
|
|
* below).
|
|
*/
|
|
|
|
var static_dtree = new Array(D_CODES * 2);
|
|
zero(static_dtree);
|
|
/* The static distance tree. (Actually a trivial tree since all codes use
|
|
* 5 bits.)
|
|
*/
|
|
|
|
var _dist_code = new Array(DIST_CODE_LEN);
|
|
zero(_dist_code);
|
|
/* Distance codes. The first 256 values correspond to the distances
|
|
* 3 .. 258, the last 256 values correspond to the top 8 bits of
|
|
* the 15 bit distances.
|
|
*/
|
|
|
|
var _length_code = new Array(MAX_MATCH - MIN_MATCH + 1);
|
|
zero(_length_code);
|
|
/* length code for each normalized match length (0 == MIN_MATCH) */
|
|
|
|
var base_length = new Array(LENGTH_CODES);
|
|
zero(base_length);
|
|
/* First normalized length for each code (0 = MIN_MATCH) */
|
|
|
|
var base_dist = new Array(D_CODES);
|
|
zero(base_dist);
|
|
/* First normalized distance for each code (0 = distance of 1) */
|
|
|
|
|
|
function StaticTreeDesc(static_tree, extra_bits, extra_base, elems, max_length) {
|
|
|
|
this.static_tree = static_tree; /* static tree or NULL */
|
|
this.extra_bits = extra_bits; /* extra bits for each code or NULL */
|
|
this.extra_base = extra_base; /* base index for extra_bits */
|
|
this.elems = elems; /* max number of elements in the tree */
|
|
this.max_length = max_length; /* max bit length for the codes */
|
|
|
|
// show if `static_tree` has data or dummy - needed for monomorphic objects
|
|
this.has_stree = static_tree && static_tree.length;
|
|
}
|
|
|
|
|
|
var static_l_desc;
|
|
var static_d_desc;
|
|
var static_bl_desc;
|
|
|
|
|
|
function TreeDesc(dyn_tree, stat_desc) {
|
|
this.dyn_tree = dyn_tree; /* the dynamic tree */
|
|
this.max_code = 0; /* largest code with non zero frequency */
|
|
this.stat_desc = stat_desc; /* the corresponding static tree */
|
|
}
|
|
|
|
|
|
|
|
function d_code(dist) {
|
|
return dist < 256 ? _dist_code[dist] : _dist_code[256 + (dist >>> 7)];
|
|
}
|
|
|
|
|
|
/* ===========================================================================
|
|
* Output a short LSB first on the stream.
|
|
* IN assertion: there is enough room in pendingBuf.
|
|
*/
|
|
function put_short(s, w) {
|
|
// put_byte(s, (uch)((w) & 0xff));
|
|
// put_byte(s, (uch)((ush)(w) >> 8));
|
|
s.pending_buf[s.pending++] = (w) & 0xff;
|
|
s.pending_buf[s.pending++] = (w >>> 8) & 0xff;
|
|
}
|
|
|
|
|
|
/* ===========================================================================
|
|
* Send a value on a given number of bits.
|
|
* IN assertion: length <= 16 and value fits in length bits.
|
|
*/
|
|
function send_bits(s, value, length) {
|
|
if (s.bi_valid > (Buf_size - length)) {
|
|
s.bi_buf |= (value << s.bi_valid) & 0xffff;
|
|
put_short(s, s.bi_buf);
|
|
s.bi_buf = value >> (Buf_size - s.bi_valid);
|
|
s.bi_valid += length - Buf_size;
|
|
} else {
|
|
s.bi_buf |= (value << s.bi_valid) & 0xffff;
|
|
s.bi_valid += length;
|
|
}
|
|
}
|
|
|
|
|
|
function send_code(s, c, tree) {
|
|
send_bits(s, tree[c * 2]/*.Code*/, tree[c * 2 + 1]/*.Len*/);
|
|
}
|
|
|
|
|
|
/* ===========================================================================
|
|
* Reverse the first len bits of a code, using straightforward code (a faster
|
|
* method would use a table)
|
|
* IN assertion: 1 <= len <= 15
|
|
*/
|
|
function bi_reverse(code, len) {
|
|
var res = 0;
|
|
do {
|
|
res |= code & 1;
|
|
code >>>= 1;
|
|
res <<= 1;
|
|
} while (--len > 0);
|
|
return res >>> 1;
|
|
}
|
|
|
|
|
|
/* ===========================================================================
|
|
* Flush the bit buffer, keeping at most 7 bits in it.
|
|
*/
|
|
function bi_flush(s) {
|
|
if (s.bi_valid === 16) {
|
|
put_short(s, s.bi_buf);
|
|
s.bi_buf = 0;
|
|
s.bi_valid = 0;
|
|
|
|
} else if (s.bi_valid >= 8) {
|
|
s.pending_buf[s.pending++] = s.bi_buf & 0xff;
|
|
s.bi_buf >>= 8;
|
|
s.bi_valid -= 8;
|
|
}
|
|
}
|
|
|
|
|
|
/* ===========================================================================
|
|
* Compute the optimal bit lengths for a tree and update the total bit length
|
|
* for the current block.
|
|
* IN assertion: the fields freq and dad are set, heap[heap_max] and
|
|
* above are the tree nodes sorted by increasing frequency.
|
|
* OUT assertions: the field len is set to the optimal bit length, the
|
|
* array bl_count contains the frequencies for each bit length.
|
|
* The length opt_len is updated; static_len is also updated if stree is
|
|
* not null.
|
|
*/
|
|
function gen_bitlen(s, desc)
|
|
// deflate_state *s;
|
|
// tree_desc *desc; /* the tree descriptor */
|
|
{
|
|
var tree = desc.dyn_tree;
|
|
var max_code = desc.max_code;
|
|
var stree = desc.stat_desc.static_tree;
|
|
var has_stree = desc.stat_desc.has_stree;
|
|
var extra = desc.stat_desc.extra_bits;
|
|
var base = desc.stat_desc.extra_base;
|
|
var max_length = desc.stat_desc.max_length;
|
|
var h; /* heap index */
|
|
var n, m; /* iterate over the tree elements */
|
|
var bits; /* bit length */
|
|
var xbits; /* extra bits */
|
|
var f; /* frequency */
|
|
var overflow = 0; /* number of elements with bit length too large */
|
|
|
|
for (bits = 0; bits <= MAX_BITS; bits++) {
|
|
s.bl_count[bits] = 0;
|
|
}
|
|
|
|
/* In a first pass, compute the optimal bit lengths (which may
|
|
* overflow in the case of the bit length tree).
|
|
*/
|
|
tree[s.heap[s.heap_max] * 2 + 1]/*.Len*/ = 0; /* root of the heap */
|
|
|
|
for (h = s.heap_max + 1; h < HEAP_SIZE; h++) {
|
|
n = s.heap[h];
|
|
bits = tree[tree[n * 2 + 1]/*.Dad*/ * 2 + 1]/*.Len*/ + 1;
|
|
if (bits > max_length) {
|
|
bits = max_length;
|
|
overflow++;
|
|
}
|
|
tree[n * 2 + 1]/*.Len*/ = bits;
|
|
/* We overwrite tree[n].Dad which is no longer needed */
|
|
|
|
if (n > max_code) { continue; } /* not a leaf node */
|
|
|
|
s.bl_count[bits]++;
|
|
xbits = 0;
|
|
if (n >= base) {
|
|
xbits = extra[n - base];
|
|
}
|
|
f = tree[n * 2]/*.Freq*/;
|
|
s.opt_len += f * (bits + xbits);
|
|
if (has_stree) {
|
|
s.static_len += f * (stree[n * 2 + 1]/*.Len*/ + xbits);
|
|
}
|
|
}
|
|
if (overflow === 0) { return; }
|
|
|
|
// Trace((stderr,"\nbit length overflow\n"));
|
|
/* This happens for example on obj2 and pic of the Calgary corpus */
|
|
|
|
/* Find the first bit length which could increase: */
|
|
do {
|
|
bits = max_length - 1;
|
|
while (s.bl_count[bits] === 0) { bits--; }
|
|
s.bl_count[bits]--; /* move one leaf down the tree */
|
|
s.bl_count[bits + 1] += 2; /* move one overflow item as its brother */
|
|
s.bl_count[max_length]--;
|
|
/* The brother of the overflow item also moves one step up,
|
|
* but this does not affect bl_count[max_length]
|
|
*/
|
|
overflow -= 2;
|
|
} while (overflow > 0);
|
|
|
|
/* Now recompute all bit lengths, scanning in increasing frequency.
|
|
* h is still equal to HEAP_SIZE. (It is simpler to reconstruct all
|
|
* lengths instead of fixing only the wrong ones. This idea is taken
|
|
* from 'ar' written by Haruhiko Okumura.)
|
|
*/
|
|
for (bits = max_length; bits !== 0; bits--) {
|
|
n = s.bl_count[bits];
|
|
while (n !== 0) {
|
|
m = s.heap[--h];
|
|
if (m > max_code) { continue; }
|
|
if (tree[m * 2 + 1]/*.Len*/ !== bits) {
|
|
// Trace((stderr,"code %d bits %d->%d\n", m, tree[m].Len, bits));
|
|
s.opt_len += (bits - tree[m * 2 + 1]/*.Len*/) * tree[m * 2]/*.Freq*/;
|
|
tree[m * 2 + 1]/*.Len*/ = bits;
|
|
}
|
|
n--;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/* ===========================================================================
|
|
* Generate the codes for a given tree and bit counts (which need not be
|
|
* optimal).
|
|
* IN assertion: the array bl_count contains the bit length statistics for
|
|
* the given tree and the field len is set for all tree elements.
|
|
* OUT assertion: the field code is set for all tree elements of non
|
|
* zero code length.
|
|
*/
|
|
function gen_codes(tree, max_code, bl_count)
|
|
// ct_data *tree; /* the tree to decorate */
|
|
// int max_code; /* largest code with non zero frequency */
|
|
// ushf *bl_count; /* number of codes at each bit length */
|
|
{
|
|
var next_code = new Array(MAX_BITS + 1); /* next code value for each bit length */
|
|
var code = 0; /* running code value */
|
|
var bits; /* bit index */
|
|
var n; /* code index */
|
|
|
|
/* The distribution counts are first used to generate the code values
|
|
* without bit reversal.
|
|
*/
|
|
for (bits = 1; bits <= MAX_BITS; bits++) {
|
|
next_code[bits] = code = (code + bl_count[bits - 1]) << 1;
|
|
}
|
|
/* Check that the bit counts in bl_count are consistent. The last code
|
|
* must be all ones.
|
|
*/
|
|
//Assert (code + bl_count[MAX_BITS]-1 == (1<<MAX_BITS)-1,
|
|
// "inconsistent bit counts");
|
|
//Tracev((stderr,"\ngen_codes: max_code %d ", max_code));
|
|
|
|
for (n = 0; n <= max_code; n++) {
|
|
var len = tree[n * 2 + 1]/*.Len*/;
|
|
if (len === 0) { continue; }
|
|
/* Now reverse the bits */
|
|
tree[n * 2]/*.Code*/ = bi_reverse(next_code[len]++, len);
|
|
|
|
//Tracecv(tree != static_ltree, (stderr,"\nn %3d %c l %2d c %4x (%x) ",
|
|
// n, (isgraph(n) ? n : ' '), len, tree[n].Code, next_code[len]-1));
|
|
}
|
|
}
|
|
|
|
|
|
/* ===========================================================================
|
|
* Initialize the various 'constant' tables.
|
|
*/
|
|
function tr_static_init() {
|
|
var n; /* iterates over tree elements */
|
|
var bits; /* bit counter */
|
|
var length; /* length value */
|
|
var code; /* code value */
|
|
var dist; /* distance index */
|
|
var bl_count = new Array(MAX_BITS + 1);
|
|
/* number of codes at each bit length for an optimal tree */
|
|
|
|
// do check in _tr_init()
|
|
//if (static_init_done) return;
|
|
|
|
/* For some embedded targets, global variables are not initialized: */
|
|
/*#ifdef NO_INIT_GLOBAL_POINTERS
|
|
static_l_desc.static_tree = static_ltree;
|
|
static_l_desc.extra_bits = extra_lbits;
|
|
static_d_desc.static_tree = static_dtree;
|
|
static_d_desc.extra_bits = extra_dbits;
|
|
static_bl_desc.extra_bits = extra_blbits;
|
|
#endif*/
|
|
|
|
/* Initialize the mapping length (0..255) -> length code (0..28) */
|
|
length = 0;
|
|
for (code = 0; code < LENGTH_CODES - 1; code++) {
|
|
base_length[code] = length;
|
|
for (n = 0; n < (1 << extra_lbits[code]); n++) {
|
|
_length_code[length++] = code;
|
|
}
|
|
}
|
|
//Assert (length == 256, "tr_static_init: length != 256");
|
|
/* Note that the length 255 (match length 258) can be represented
|
|
* in two different ways: code 284 + 5 bits or code 285, so we
|
|
* overwrite length_code[255] to use the best encoding:
|
|
*/
|
|
_length_code[length - 1] = code;
|
|
|
|
/* Initialize the mapping dist (0..32K) -> dist code (0..29) */
|
|
dist = 0;
|
|
for (code = 0; code < 16; code++) {
|
|
base_dist[code] = dist;
|
|
for (n = 0; n < (1 << extra_dbits[code]); n++) {
|
|
_dist_code[dist++] = code;
|
|
}
|
|
}
|
|
//Assert (dist == 256, "tr_static_init: dist != 256");
|
|
dist >>= 7; /* from now on, all distances are divided by 128 */
|
|
for (; code < D_CODES; code++) {
|
|
base_dist[code] = dist << 7;
|
|
for (n = 0; n < (1 << (extra_dbits[code] - 7)); n++) {
|
|
_dist_code[256 + dist++] = code;
|
|
}
|
|
}
|
|
//Assert (dist == 256, "tr_static_init: 256+dist != 512");
|
|
|
|
/* Construct the codes of the static literal tree */
|
|
for (bits = 0; bits <= MAX_BITS; bits++) {
|
|
bl_count[bits] = 0;
|
|
}
|
|
|
|
n = 0;
|
|
while (n <= 143) {
|
|
static_ltree[n * 2 + 1]/*.Len*/ = 8;
|
|
n++;
|
|
bl_count[8]++;
|
|
}
|
|
while (n <= 255) {
|
|
static_ltree[n * 2 + 1]/*.Len*/ = 9;
|
|
n++;
|
|
bl_count[9]++;
|
|
}
|
|
while (n <= 279) {
|
|
static_ltree[n * 2 + 1]/*.Len*/ = 7;
|
|
n++;
|
|
bl_count[7]++;
|
|
}
|
|
while (n <= 287) {
|
|
static_ltree[n * 2 + 1]/*.Len*/ = 8;
|
|
n++;
|
|
bl_count[8]++;
|
|
}
|
|
/* Codes 286 and 287 do not exist, but we must include them in the
|
|
* tree construction to get a canonical Huffman tree (longest code
|
|
* all ones)
|
|
*/
|
|
gen_codes(static_ltree, L_CODES + 1, bl_count);
|
|
|
|
/* The static distance tree is trivial: */
|
|
for (n = 0; n < D_CODES; n++) {
|
|
static_dtree[n * 2 + 1]/*.Len*/ = 5;
|
|
static_dtree[n * 2]/*.Code*/ = bi_reverse(n, 5);
|
|
}
|
|
|
|
// Now data ready and we can init static trees
|
|
static_l_desc = new StaticTreeDesc(static_ltree, extra_lbits, LITERALS + 1, L_CODES, MAX_BITS);
|
|
static_d_desc = new StaticTreeDesc(static_dtree, extra_dbits, 0, D_CODES, MAX_BITS);
|
|
static_bl_desc = new StaticTreeDesc(new Array(0), extra_blbits, 0, BL_CODES, MAX_BL_BITS);
|
|
|
|
//static_init_done = true;
|
|
}
|
|
|
|
|
|
/* ===========================================================================
|
|
* Initialize a new block.
|
|
*/
|
|
function init_block(s) {
|
|
var n; /* iterates over tree elements */
|
|
|
|
/* Initialize the trees. */
|
|
for (n = 0; n < L_CODES; n++) { s.dyn_ltree[n * 2]/*.Freq*/ = 0; }
|
|
for (n = 0; n < D_CODES; n++) { s.dyn_dtree[n * 2]/*.Freq*/ = 0; }
|
|
for (n = 0; n < BL_CODES; n++) { s.bl_tree[n * 2]/*.Freq*/ = 0; }
|
|
|
|
s.dyn_ltree[END_BLOCK * 2]/*.Freq*/ = 1;
|
|
s.opt_len = s.static_len = 0;
|
|
s.last_lit = s.matches = 0;
|
|
}
|
|
|
|
|
|
/* ===========================================================================
|
|
* Flush the bit buffer and align the output on a byte boundary
|
|
*/
|
|
function bi_windup(s)
|
|
{
|
|
if (s.bi_valid > 8) {
|
|
put_short(s, s.bi_buf);
|
|
} else if (s.bi_valid > 0) {
|
|
//put_byte(s, (Byte)s->bi_buf);
|
|
s.pending_buf[s.pending++] = s.bi_buf;
|
|
}
|
|
s.bi_buf = 0;
|
|
s.bi_valid = 0;
|
|
}
|
|
|
|
/* ===========================================================================
|
|
* Copy a stored block, storing first the length and its
|
|
* one's complement if requested.
|
|
*/
|
|
function copy_block(s, buf, len, header)
|
|
//DeflateState *s;
|
|
//charf *buf; /* the input data */
|
|
//unsigned len; /* its length */
|
|
//int header; /* true if block header must be written */
|
|
{
|
|
bi_windup(s); /* align on byte boundary */
|
|
|
|
if (header) {
|
|
put_short(s, len);
|
|
put_short(s, ~len);
|
|
}
|
|
// while (len--) {
|
|
// put_byte(s, *buf++);
|
|
// }
|
|
utils.arraySet(s.pending_buf, s.window, buf, len, s.pending);
|
|
s.pending += len;
|
|
}
|
|
|
|
/* ===========================================================================
|
|
* Compares to subtrees, using the tree depth as tie breaker when
|
|
* the subtrees have equal frequency. This minimizes the worst case length.
|
|
*/
|
|
function smaller(tree, n, m, depth) {
|
|
var _n2 = n * 2;
|
|
var _m2 = m * 2;
|
|
return (tree[_n2]/*.Freq*/ < tree[_m2]/*.Freq*/ ||
|
|
(tree[_n2]/*.Freq*/ === tree[_m2]/*.Freq*/ && depth[n] <= depth[m]));
|
|
}
|
|
|
|
/* ===========================================================================
|
|
* Restore the heap property by moving down the tree starting at node k,
|
|
* exchanging a node with the smallest of its two sons if necessary, stopping
|
|
* when the heap property is re-established (each father smaller than its
|
|
* two sons).
|
|
*/
|
|
function pqdownheap(s, tree, k)
|
|
// deflate_state *s;
|
|
// ct_data *tree; /* the tree to restore */
|
|
// int k; /* node to move down */
|
|
{
|
|
var v = s.heap[k];
|
|
var j = k << 1; /* left son of k */
|
|
while (j <= s.heap_len) {
|
|
/* Set j to the smallest of the two sons: */
|
|
if (j < s.heap_len &&
|
|
smaller(tree, s.heap[j + 1], s.heap[j], s.depth)) {
|
|
j++;
|
|
}
|
|
/* Exit if v is smaller than both sons */
|
|
if (smaller(tree, v, s.heap[j], s.depth)) { break; }
|
|
|
|
/* Exchange v with the smallest son */
|
|
s.heap[k] = s.heap[j];
|
|
k = j;
|
|
|
|
/* And continue down the tree, setting j to the left son of k */
|
|
j <<= 1;
|
|
}
|
|
s.heap[k] = v;
|
|
}
|
|
|
|
|
|
// inlined manually
|
|
// var SMALLEST = 1;
|
|
|
|
/* ===========================================================================
|
|
* Send the block data compressed using the given Huffman trees
|
|
*/
|
|
function compress_block(s, ltree, dtree)
|
|
// deflate_state *s;
|
|
// const ct_data *ltree; /* literal tree */
|
|
// const ct_data *dtree; /* distance tree */
|
|
{
|
|
var dist; /* distance of matched string */
|
|
var lc; /* match length or unmatched char (if dist == 0) */
|
|
var lx = 0; /* running index in l_buf */
|
|
var code; /* the code to send */
|
|
var extra; /* number of extra bits to send */
|
|
|
|
if (s.last_lit !== 0) {
|
|
do {
|
|
dist = (s.pending_buf[s.d_buf + lx * 2] << 8) | (s.pending_buf[s.d_buf + lx * 2 + 1]);
|
|
lc = s.pending_buf[s.l_buf + lx];
|
|
lx++;
|
|
|
|
if (dist === 0) {
|
|
send_code(s, lc, ltree); /* send a literal byte */
|
|
//Tracecv(isgraph(lc), (stderr," '%c' ", lc));
|
|
} else {
|
|
/* Here, lc is the match length - MIN_MATCH */
|
|
code = _length_code[lc];
|
|
send_code(s, code + LITERALS + 1, ltree); /* send the length code */
|
|
extra = extra_lbits[code];
|
|
if (extra !== 0) {
|
|
lc -= base_length[code];
|
|
send_bits(s, lc, extra); /* send the extra length bits */
|
|
}
|
|
dist--; /* dist is now the match distance - 1 */
|
|
code = d_code(dist);
|
|
//Assert (code < D_CODES, "bad d_code");
|
|
|
|
send_code(s, code, dtree); /* send the distance code */
|
|
extra = extra_dbits[code];
|
|
if (extra !== 0) {
|
|
dist -= base_dist[code];
|
|
send_bits(s, dist, extra); /* send the extra distance bits */
|
|
}
|
|
} /* literal or match pair ? */
|
|
|
|
/* Check that the overlay between pending_buf and d_buf+l_buf is ok: */
|
|
//Assert((uInt)(s->pending) < s->lit_bufsize + 2*lx,
|
|
// "pendingBuf overflow");
|
|
|
|
} while (lx < s.last_lit);
|
|
}
|
|
|
|
send_code(s, END_BLOCK, ltree);
|
|
}
|
|
|
|
|
|
/* ===========================================================================
|
|
* Construct one Huffman tree and assigns the code bit strings and lengths.
|
|
* Update the total bit length for the current block.
|
|
* IN assertion: the field freq is set for all tree elements.
|
|
* OUT assertions: the fields len and code are set to the optimal bit length
|
|
* and corresponding code. The length opt_len is updated; static_len is
|
|
* also updated if stree is not null. The field max_code is set.
|
|
*/
|
|
function build_tree(s, desc)
|
|
// deflate_state *s;
|
|
// tree_desc *desc; /* the tree descriptor */
|
|
{
|
|
var tree = desc.dyn_tree;
|
|
var stree = desc.stat_desc.static_tree;
|
|
var has_stree = desc.stat_desc.has_stree;
|
|
var elems = desc.stat_desc.elems;
|
|
var n, m; /* iterate over heap elements */
|
|
var max_code = -1; /* largest code with non zero frequency */
|
|
var node; /* new node being created */
|
|
|
|
/* Construct the initial heap, with least frequent element in
|
|
* heap[SMALLEST]. The sons of heap[n] are heap[2*n] and heap[2*n+1].
|
|
* heap[0] is not used.
|
|
*/
|
|
s.heap_len = 0;
|
|
s.heap_max = HEAP_SIZE;
|
|
|
|
for (n = 0; n < elems; n++) {
|
|
if (tree[n * 2]/*.Freq*/ !== 0) {
|
|
s.heap[++s.heap_len] = max_code = n;
|
|
s.depth[n] = 0;
|
|
|
|
} else {
|
|
tree[n * 2 + 1]/*.Len*/ = 0;
|
|
}
|
|
}
|
|
|
|
/* The pkzip format requires that at least one distance code exists,
|
|
* and that at least one bit should be sent even if there is only one
|
|
* possible code. So to avoid special checks later on we force at least
|
|
* two codes of non zero frequency.
|
|
*/
|
|
while (s.heap_len < 2) {
|
|
node = s.heap[++s.heap_len] = (max_code < 2 ? ++max_code : 0);
|
|
tree[node * 2]/*.Freq*/ = 1;
|
|
s.depth[node] = 0;
|
|
s.opt_len--;
|
|
|
|
if (has_stree) {
|
|
s.static_len -= stree[node * 2 + 1]/*.Len*/;
|
|
}
|
|
/* node is 0 or 1 so it does not have extra bits */
|
|
}
|
|
desc.max_code = max_code;
|
|
|
|
/* The elements heap[heap_len/2+1 .. heap_len] are leaves of the tree,
|
|
* establish sub-heaps of increasing lengths:
|
|
*/
|
|
for (n = (s.heap_len >> 1/*int /2*/); n >= 1; n--) { pqdownheap(s, tree, n); }
|
|
|
|
/* Construct the Huffman tree by repeatedly combining the least two
|
|
* frequent nodes.
|
|
*/
|
|
node = elems; /* next internal node of the tree */
|
|
do {
|
|
//pqremove(s, tree, n); /* n = node of least frequency */
|
|
/*** pqremove ***/
|
|
n = s.heap[1/*SMALLEST*/];
|
|
s.heap[1/*SMALLEST*/] = s.heap[s.heap_len--];
|
|
pqdownheap(s, tree, 1/*SMALLEST*/);
|
|
/***/
|
|
|
|
m = s.heap[1/*SMALLEST*/]; /* m = node of next least frequency */
|
|
|
|
s.heap[--s.heap_max] = n; /* keep the nodes sorted by frequency */
|
|
s.heap[--s.heap_max] = m;
|
|
|
|
/* Create a new node father of n and m */
|
|
tree[node * 2]/*.Freq*/ = tree[n * 2]/*.Freq*/ + tree[m * 2]/*.Freq*/;
|
|
s.depth[node] = (s.depth[n] >= s.depth[m] ? s.depth[n] : s.depth[m]) + 1;
|
|
tree[n * 2 + 1]/*.Dad*/ = tree[m * 2 + 1]/*.Dad*/ = node;
|
|
|
|
/* and insert the new node in the heap */
|
|
s.heap[1/*SMALLEST*/] = node++;
|
|
pqdownheap(s, tree, 1/*SMALLEST*/);
|
|
|
|
} while (s.heap_len >= 2);
|
|
|
|
s.heap[--s.heap_max] = s.heap[1/*SMALLEST*/];
|
|
|
|
/* At this point, the fields freq and dad are set. We can now
|
|
* generate the bit lengths.
|
|
*/
|
|
gen_bitlen(s, desc);
|
|
|
|
/* The field len is now set, we can generate the bit codes */
|
|
gen_codes(tree, max_code, s.bl_count);
|
|
}
|
|
|
|
|
|
/* ===========================================================================
|
|
* Scan a literal or distance tree to determine the frequencies of the codes
|
|
* in the bit length tree.
|
|
*/
|
|
function scan_tree(s, tree, max_code)
|
|
// deflate_state *s;
|
|
// ct_data *tree; /* the tree to be scanned */
|
|
// int max_code; /* and its largest code of non zero frequency */
|
|
{
|
|
var n; /* iterates over all tree elements */
|
|
var prevlen = -1; /* last emitted length */
|
|
var curlen; /* length of current code */
|
|
|
|
var nextlen = tree[0 * 2 + 1]/*.Len*/; /* length of next code */
|
|
|
|
var count = 0; /* repeat count of the current code */
|
|
var max_count = 7; /* max repeat count */
|
|
var min_count = 4; /* min repeat count */
|
|
|
|
if (nextlen === 0) {
|
|
max_count = 138;
|
|
min_count = 3;
|
|
}
|
|
tree[(max_code + 1) * 2 + 1]/*.Len*/ = 0xffff; /* guard */
|
|
|
|
for (n = 0; n <= max_code; n++) {
|
|
curlen = nextlen;
|
|
nextlen = tree[(n + 1) * 2 + 1]/*.Len*/;
|
|
|
|
if (++count < max_count && curlen === nextlen) {
|
|
continue;
|
|
|
|
} else if (count < min_count) {
|
|
s.bl_tree[curlen * 2]/*.Freq*/ += count;
|
|
|
|
} else if (curlen !== 0) {
|
|
|
|
if (curlen !== prevlen) { s.bl_tree[curlen * 2]/*.Freq*/++; }
|
|
s.bl_tree[REP_3_6 * 2]/*.Freq*/++;
|
|
|
|
} else if (count <= 10) {
|
|
s.bl_tree[REPZ_3_10 * 2]/*.Freq*/++;
|
|
|
|
} else {
|
|
s.bl_tree[REPZ_11_138 * 2]/*.Freq*/++;
|
|
}
|
|
|
|
count = 0;
|
|
prevlen = curlen;
|
|
|
|
if (nextlen === 0) {
|
|
max_count = 138;
|
|
min_count = 3;
|
|
|
|
} else if (curlen === nextlen) {
|
|
max_count = 6;
|
|
min_count = 3;
|
|
|
|
} else {
|
|
max_count = 7;
|
|
min_count = 4;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/* ===========================================================================
|
|
* Send a literal or distance tree in compressed form, using the codes in
|
|
* bl_tree.
|
|
*/
|
|
function send_tree(s, tree, max_code)
|
|
// deflate_state *s;
|
|
// ct_data *tree; /* the tree to be scanned */
|
|
// int max_code; /* and its largest code of non zero frequency */
|
|
{
|
|
var n; /* iterates over all tree elements */
|
|
var prevlen = -1; /* last emitted length */
|
|
var curlen; /* length of current code */
|
|
|
|
var nextlen = tree[0 * 2 + 1]/*.Len*/; /* length of next code */
|
|
|
|
var count = 0; /* repeat count of the current code */
|
|
var max_count = 7; /* max repeat count */
|
|
var min_count = 4; /* min repeat count */
|
|
|
|
/* tree[max_code+1].Len = -1; */ /* guard already set */
|
|
if (nextlen === 0) {
|
|
max_count = 138;
|
|
min_count = 3;
|
|
}
|
|
|
|
for (n = 0; n <= max_code; n++) {
|
|
curlen = nextlen;
|
|
nextlen = tree[(n + 1) * 2 + 1]/*.Len*/;
|
|
|
|
if (++count < max_count && curlen === nextlen) {
|
|
continue;
|
|
|
|
} else if (count < min_count) {
|
|
do { send_code(s, curlen, s.bl_tree); } while (--count !== 0);
|
|
|
|
} else if (curlen !== 0) {
|
|
if (curlen !== prevlen) {
|
|
send_code(s, curlen, s.bl_tree);
|
|
count--;
|
|
}
|
|
//Assert(count >= 3 && count <= 6, " 3_6?");
|
|
send_code(s, REP_3_6, s.bl_tree);
|
|
send_bits(s, count - 3, 2);
|
|
|
|
} else if (count <= 10) {
|
|
send_code(s, REPZ_3_10, s.bl_tree);
|
|
send_bits(s, count - 3, 3);
|
|
|
|
} else {
|
|
send_code(s, REPZ_11_138, s.bl_tree);
|
|
send_bits(s, count - 11, 7);
|
|
}
|
|
|
|
count = 0;
|
|
prevlen = curlen;
|
|
if (nextlen === 0) {
|
|
max_count = 138;
|
|
min_count = 3;
|
|
|
|
} else if (curlen === nextlen) {
|
|
max_count = 6;
|
|
min_count = 3;
|
|
|
|
} else {
|
|
max_count = 7;
|
|
min_count = 4;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/* ===========================================================================
|
|
* Construct the Huffman tree for the bit lengths and return the index in
|
|
* bl_order of the last bit length code to send.
|
|
*/
|
|
function build_bl_tree(s) {
|
|
var max_blindex; /* index of last bit length code of non zero freq */
|
|
|
|
/* Determine the bit length frequencies for literal and distance trees */
|
|
scan_tree(s, s.dyn_ltree, s.l_desc.max_code);
|
|
scan_tree(s, s.dyn_dtree, s.d_desc.max_code);
|
|
|
|
/* Build the bit length tree: */
|
|
build_tree(s, s.bl_desc);
|
|
/* opt_len now includes the length of the tree representations, except
|
|
* the lengths of the bit lengths codes and the 5+5+4 bits for the counts.
|
|
*/
|
|
|
|
/* Determine the number of bit length codes to send. The pkzip format
|
|
* requires that at least 4 bit length codes be sent. (appnote.txt says
|
|
* 3 but the actual value used is 4.)
|
|
*/
|
|
for (max_blindex = BL_CODES - 1; max_blindex >= 3; max_blindex--) {
|
|
if (s.bl_tree[bl_order[max_blindex] * 2 + 1]/*.Len*/ !== 0) {
|
|
break;
|
|
}
|
|
}
|
|
/* Update opt_len to include the bit length tree and counts */
|
|
s.opt_len += 3 * (max_blindex + 1) + 5 + 5 + 4;
|
|
//Tracev((stderr, "\ndyn trees: dyn %ld, stat %ld",
|
|
// s->opt_len, s->static_len));
|
|
|
|
return max_blindex;
|
|
}
|
|
|
|
|
|
/* ===========================================================================
|
|
* Send the header for a block using dynamic Huffman trees: the counts, the
|
|
* lengths of the bit length codes, the literal tree and the distance tree.
|
|
* IN assertion: lcodes >= 257, dcodes >= 1, blcodes >= 4.
|
|
*/
|
|
function send_all_trees(s, lcodes, dcodes, blcodes)
|
|
// deflate_state *s;
|
|
// int lcodes, dcodes, blcodes; /* number of codes for each tree */
|
|
{
|
|
var rank; /* index in bl_order */
|
|
|
|
//Assert (lcodes >= 257 && dcodes >= 1 && blcodes >= 4, "not enough codes");
|
|
//Assert (lcodes <= L_CODES && dcodes <= D_CODES && blcodes <= BL_CODES,
|
|
// "too many codes");
|
|
//Tracev((stderr, "\nbl counts: "));
|
|
send_bits(s, lcodes - 257, 5); /* not +255 as stated in appnote.txt */
|
|
send_bits(s, dcodes - 1, 5);
|
|
send_bits(s, blcodes - 4, 4); /* not -3 as stated in appnote.txt */
|
|
for (rank = 0; rank < blcodes; rank++) {
|
|
//Tracev((stderr, "\nbl code %2d ", bl_order[rank]));
|
|
send_bits(s, s.bl_tree[bl_order[rank] * 2 + 1]/*.Len*/, 3);
|
|
}
|
|
//Tracev((stderr, "\nbl tree: sent %ld", s->bits_sent));
|
|
|
|
send_tree(s, s.dyn_ltree, lcodes - 1); /* literal tree */
|
|
//Tracev((stderr, "\nlit tree: sent %ld", s->bits_sent));
|
|
|
|
send_tree(s, s.dyn_dtree, dcodes - 1); /* distance tree */
|
|
//Tracev((stderr, "\ndist tree: sent %ld", s->bits_sent));
|
|
}
|
|
|
|
|
|
/* ===========================================================================
|
|
* Check if the data type is TEXT or BINARY, using the following algorithm:
|
|
* - TEXT if the two conditions below are satisfied:
|
|
* a) There are no non-portable control characters belonging to the
|
|
* "black list" (0..6, 14..25, 28..31).
|
|
* b) There is at least one printable character belonging to the
|
|
* "white list" (9 {TAB}, 10 {LF}, 13 {CR}, 32..255).
|
|
* - BINARY otherwise.
|
|
* - The following partially-portable control characters form a
|
|
* "gray list" that is ignored in this detection algorithm:
|
|
* (7 {BEL}, 8 {BS}, 11 {VT}, 12 {FF}, 26 {SUB}, 27 {ESC}).
|
|
* IN assertion: the fields Freq of dyn_ltree are set.
|
|
*/
|
|
function detect_data_type(s) {
|
|
/* black_mask is the bit mask of black-listed bytes
|
|
* set bits 0..6, 14..25, and 28..31
|
|
* 0xf3ffc07f = binary 11110011111111111100000001111111
|
|
*/
|
|
var black_mask = 0xf3ffc07f;
|
|
var n;
|
|
|
|
/* Check for non-textual ("black-listed") bytes. */
|
|
for (n = 0; n <= 31; n++, black_mask >>>= 1) {
|
|
if ((black_mask & 1) && (s.dyn_ltree[n * 2]/*.Freq*/ !== 0)) {
|
|
return Z_BINARY;
|
|
}
|
|
}
|
|
|
|
/* Check for textual ("white-listed") bytes. */
|
|
if (s.dyn_ltree[9 * 2]/*.Freq*/ !== 0 || s.dyn_ltree[10 * 2]/*.Freq*/ !== 0 ||
|
|
s.dyn_ltree[13 * 2]/*.Freq*/ !== 0) {
|
|
return Z_TEXT;
|
|
}
|
|
for (n = 32; n < LITERALS; n++) {
|
|
if (s.dyn_ltree[n * 2]/*.Freq*/ !== 0) {
|
|
return Z_TEXT;
|
|
}
|
|
}
|
|
|
|
/* There are no "black-listed" or "white-listed" bytes:
|
|
* this stream either is empty or has tolerated ("gray-listed") bytes only.
|
|
*/
|
|
return Z_BINARY;
|
|
}
|
|
|
|
|
|
var static_init_done = false;
|
|
|
|
/* ===========================================================================
|
|
* Initialize the tree data structures for a new zlib stream.
|
|
*/
|
|
function _tr_init(s)
|
|
{
|
|
|
|
if (!static_init_done) {
|
|
tr_static_init();
|
|
static_init_done = true;
|
|
}
|
|
|
|
s.l_desc = new TreeDesc(s.dyn_ltree, static_l_desc);
|
|
s.d_desc = new TreeDesc(s.dyn_dtree, static_d_desc);
|
|
s.bl_desc = new TreeDesc(s.bl_tree, static_bl_desc);
|
|
|
|
s.bi_buf = 0;
|
|
s.bi_valid = 0;
|
|
|
|
/* Initialize the first block of the first file: */
|
|
init_block(s);
|
|
}
|
|
|
|
|
|
/* ===========================================================================
|
|
* Send a stored block
|
|
*/
|
|
function _tr_stored_block(s, buf, stored_len, last)
|
|
//DeflateState *s;
|
|
//charf *buf; /* input block */
|
|
//ulg stored_len; /* length of input block */
|
|
//int last; /* one if this is the last block for a file */
|
|
{
|
|
send_bits(s, (STORED_BLOCK << 1) + (last ? 1 : 0), 3); /* send block type */
|
|
copy_block(s, buf, stored_len, true); /* with header */
|
|
}
|
|
|
|
|
|
/* ===========================================================================
|
|
* Send one empty static block to give enough lookahead for inflate.
|
|
* This takes 10 bits, of which 7 may remain in the bit buffer.
|
|
*/
|
|
function _tr_align(s) {
|
|
send_bits(s, STATIC_TREES << 1, 3);
|
|
send_code(s, END_BLOCK, static_ltree);
|
|
bi_flush(s);
|
|
}
|
|
|
|
|
|
/* ===========================================================================
|
|
* Determine the best encoding for the current block: dynamic trees, static
|
|
* trees or store, and output the encoded block to the zip file.
|
|
*/
|
|
function _tr_flush_block(s, buf, stored_len, last)
|
|
//DeflateState *s;
|
|
//charf *buf; /* input block, or NULL if too old */
|
|
//ulg stored_len; /* length of input block */
|
|
//int last; /* one if this is the last block for a file */
|
|
{
|
|
var opt_lenb, static_lenb; /* opt_len and static_len in bytes */
|
|
var max_blindex = 0; /* index of last bit length code of non zero freq */
|
|
|
|
/* Build the Huffman trees unless a stored block is forced */
|
|
if (s.level > 0) {
|
|
|
|
/* Check if the file is binary or text */
|
|
if (s.strm.data_type === Z_UNKNOWN) {
|
|
s.strm.data_type = detect_data_type(s);
|
|
}
|
|
|
|
/* Construct the literal and distance trees */
|
|
build_tree(s, s.l_desc);
|
|
// Tracev((stderr, "\nlit data: dyn %ld, stat %ld", s->opt_len,
|
|
// s->static_len));
|
|
|
|
build_tree(s, s.d_desc);
|
|
// Tracev((stderr, "\ndist data: dyn %ld, stat %ld", s->opt_len,
|
|
// s->static_len));
|
|
/* At this point, opt_len and static_len are the total bit lengths of
|
|
* the compressed block data, excluding the tree representations.
|
|
*/
|
|
|
|
/* Build the bit length tree for the above two trees, and get the index
|
|
* in bl_order of the last bit length code to send.
|
|
*/
|
|
max_blindex = build_bl_tree(s);
|
|
|
|
/* Determine the best encoding. Compute the block lengths in bytes. */
|
|
opt_lenb = (s.opt_len + 3 + 7) >>> 3;
|
|
static_lenb = (s.static_len + 3 + 7) >>> 3;
|
|
|
|
// Tracev((stderr, "\nopt %lu(%lu) stat %lu(%lu) stored %lu lit %u ",
|
|
// opt_lenb, s->opt_len, static_lenb, s->static_len, stored_len,
|
|
// s->last_lit));
|
|
|
|
if (static_lenb <= opt_lenb) { opt_lenb = static_lenb; }
|
|
|
|
} else {
|
|
// Assert(buf != (char*)0, "lost buf");
|
|
opt_lenb = static_lenb = stored_len + 5; /* force a stored block */
|
|
}
|
|
|
|
if ((stored_len + 4 <= opt_lenb) && (buf !== -1)) {
|
|
/* 4: two words for the lengths */
|
|
|
|
/* The test buf != NULL is only necessary if LIT_BUFSIZE > WSIZE.
|
|
* Otherwise we can't have processed more than WSIZE input bytes since
|
|
* the last block flush, because compression would have been
|
|
* successful. If LIT_BUFSIZE <= WSIZE, it is never too late to
|
|
* transform a block into a stored block.
|
|
*/
|
|
_tr_stored_block(s, buf, stored_len, last);
|
|
|
|
} else if (s.strategy === Z_FIXED || static_lenb === opt_lenb) {
|
|
|
|
send_bits(s, (STATIC_TREES << 1) + (last ? 1 : 0), 3);
|
|
compress_block(s, static_ltree, static_dtree);
|
|
|
|
} else {
|
|
send_bits(s, (DYN_TREES << 1) + (last ? 1 : 0), 3);
|
|
send_all_trees(s, s.l_desc.max_code + 1, s.d_desc.max_code + 1, max_blindex + 1);
|
|
compress_block(s, s.dyn_ltree, s.dyn_dtree);
|
|
}
|
|
// Assert (s->compressed_len == s->bits_sent, "bad compressed size");
|
|
/* The above check is made mod 2^32, for files larger than 512 MB
|
|
* and uLong implemented on 32 bits.
|
|
*/
|
|
init_block(s);
|
|
|
|
if (last) {
|
|
bi_windup(s);
|
|
}
|
|
// Tracev((stderr,"\ncomprlen %lu(%lu) ", s->compressed_len>>3,
|
|
// s->compressed_len-7*last));
|
|
}
|
|
|
|
/* ===========================================================================
|
|
* Save the match info and tally the frequency counts. Return true if
|
|
* the current block must be flushed.
|
|
*/
|
|
function _tr_tally(s, dist, lc)
|
|
// deflate_state *s;
|
|
// unsigned dist; /* distance of matched string */
|
|
// unsigned lc; /* match length-MIN_MATCH or unmatched char (if dist==0) */
|
|
{
|
|
//var out_length, in_length, dcode;
|
|
|
|
s.pending_buf[s.d_buf + s.last_lit * 2] = (dist >>> 8) & 0xff;
|
|
s.pending_buf[s.d_buf + s.last_lit * 2 + 1] = dist & 0xff;
|
|
|
|
s.pending_buf[s.l_buf + s.last_lit] = lc & 0xff;
|
|
s.last_lit++;
|
|
|
|
if (dist === 0) {
|
|
/* lc is the unmatched char */
|
|
s.dyn_ltree[lc * 2]/*.Freq*/++;
|
|
} else {
|
|
s.matches++;
|
|
/* Here, lc is the match length - MIN_MATCH */
|
|
dist--; /* dist = match distance - 1 */
|
|
//Assert((ush)dist < (ush)MAX_DIST(s) &&
|
|
// (ush)lc <= (ush)(MAX_MATCH-MIN_MATCH) &&
|
|
// (ush)d_code(dist) < (ush)D_CODES, "_tr_tally: bad match");
|
|
|
|
s.dyn_ltree[(_length_code[lc] + LITERALS + 1) * 2]/*.Freq*/++;
|
|
s.dyn_dtree[d_code(dist) * 2]/*.Freq*/++;
|
|
}
|
|
|
|
// (!) This block is disabled in zlib defaults,
|
|
// don't enable it for binary compatibility
|
|
|
|
//#ifdef TRUNCATE_BLOCK
|
|
// /* Try to guess if it is profitable to stop the current block here */
|
|
// if ((s.last_lit & 0x1fff) === 0 && s.level > 2) {
|
|
// /* Compute an upper bound for the compressed length */
|
|
// out_length = s.last_lit*8;
|
|
// in_length = s.strstart - s.block_start;
|
|
//
|
|
// for (dcode = 0; dcode < D_CODES; dcode++) {
|
|
// out_length += s.dyn_dtree[dcode*2]/*.Freq*/ * (5 + extra_dbits[dcode]);
|
|
// }
|
|
// out_length >>>= 3;
|
|
// //Tracev((stderr,"\nlast_lit %u, in %ld, out ~%ld(%ld%%) ",
|
|
// // s->last_lit, in_length, out_length,
|
|
// // 100L - out_length*100L/in_length));
|
|
// if (s.matches < (s.last_lit>>1)/*int /2*/ && out_length < (in_length>>1)/*int /2*/) {
|
|
// return true;
|
|
// }
|
|
// }
|
|
//#endif
|
|
|
|
return (s.last_lit === s.lit_bufsize - 1);
|
|
/* We avoid equality with lit_bufsize because of wraparound at 64K
|
|
* on 16 bit machines and because stored blocks are restricted to
|
|
* 64K-1 bytes.
|
|
*/
|
|
}
|
|
|
|
exports._tr_init = _tr_init;
|
|
exports._tr_stored_block = _tr_stored_block;
|
|
exports._tr_flush_block = _tr_flush_block;
|
|
exports._tr_tally = _tr_tally;
|
|
exports._tr_align = _tr_align;
|
|
|
|
},{"../utils/common":1}],8:[function(require,module,exports){
|
|
'use strict';
|
|
|
|
// (C) 1995-2013 Jean-loup Gailly and Mark Adler
|
|
// (C) 2014-2017 Vitaly Puzrin and Andrey Tupitsin
|
|
//
|
|
// This software is provided 'as-is', without any express or implied
|
|
// warranty. In no event will the authors be held liable for any damages
|
|
// arising from the use of this software.
|
|
//
|
|
// Permission is granted to anyone to use this software for any purpose,
|
|
// including commercial applications, and to alter it and redistribute it
|
|
// freely, subject to the following restrictions:
|
|
//
|
|
// 1. The origin of this software must not be misrepresented; you must not
|
|
// claim that you wrote the original software. If you use this software
|
|
// in a product, an acknowledgment in the product documentation would be
|
|
// appreciated but is not required.
|
|
// 2. Altered source versions must be plainly marked as such, and must not be
|
|
// misrepresented as being the original software.
|
|
// 3. This notice may not be removed or altered from any source distribution.
|
|
|
|
function ZStream() {
|
|
/* next input byte */
|
|
this.input = null; // JS specific, because we have no pointers
|
|
this.next_in = 0;
|
|
/* number of bytes available at input */
|
|
this.avail_in = 0;
|
|
/* total number of input bytes read so far */
|
|
this.total_in = 0;
|
|
/* next output byte should be put there */
|
|
this.output = null; // JS specific, because we have no pointers
|
|
this.next_out = 0;
|
|
/* remaining free space at output */
|
|
this.avail_out = 0;
|
|
/* total number of bytes output so far */
|
|
this.total_out = 0;
|
|
/* last error message, NULL if no error */
|
|
this.msg = ''/*Z_NULL*/;
|
|
/* not visible by applications */
|
|
this.state = null;
|
|
/* best guess about the data type: binary or text */
|
|
this.data_type = 2/*Z_UNKNOWN*/;
|
|
/* adler32 value of the uncompressed data */
|
|
this.adler = 0;
|
|
}
|
|
|
|
module.exports = ZStream;
|
|
|
|
},{}],"/lib/deflate.js":[function(require,module,exports){
|
|
'use strict';
|
|
|
|
|
|
var zlib_deflate = require('./zlib/deflate');
|
|
var utils = require('./utils/common');
|
|
var strings = require('./utils/strings');
|
|
var msg = require('./zlib/messages');
|
|
var ZStream = require('./zlib/zstream');
|
|
|
|
var toString = Object.prototype.toString;
|
|
|
|
/* Public constants ==========================================================*/
|
|
/* ===========================================================================*/
|
|
|
|
var Z_NO_FLUSH = 0;
|
|
var Z_FINISH = 4;
|
|
|
|
var Z_OK = 0;
|
|
var Z_STREAM_END = 1;
|
|
var Z_SYNC_FLUSH = 2;
|
|
|
|
var Z_DEFAULT_COMPRESSION = -1;
|
|
|
|
var Z_DEFAULT_STRATEGY = 0;
|
|
|
|
var Z_DEFLATED = 8;
|
|
|
|
/* ===========================================================================*/
|
|
|
|
|
|
/**
|
|
* class Deflate
|
|
*
|
|
* Generic JS-style wrapper for zlib calls. If you don't need
|
|
* streaming behaviour - use more simple functions: [[deflate]],
|
|
* [[deflateRaw]] and [[gzip]].
|
|
**/
|
|
|
|
/* internal
|
|
* Deflate.chunks -> Array
|
|
*
|
|
* Chunks of output data, if [[Deflate#onData]] not overridden.
|
|
**/
|
|
|
|
/**
|
|
* Deflate.result -> Uint8Array|Array
|
|
*
|
|
* Compressed result, generated by default [[Deflate#onData]]
|
|
* and [[Deflate#onEnd]] handlers. Filled after you push last chunk
|
|
* (call [[Deflate#push]] with `Z_FINISH` / `true` param) or if you
|
|
* push a chunk with explicit flush (call [[Deflate#push]] with
|
|
* `Z_SYNC_FLUSH` param).
|
|
**/
|
|
|
|
/**
|
|
* Deflate.err -> Number
|
|
*
|
|
* Error code after deflate finished. 0 (Z_OK) on success.
|
|
* You will not need it in real life, because deflate errors
|
|
* are possible only on wrong options or bad `onData` / `onEnd`
|
|
* custom handlers.
|
|
**/
|
|
|
|
/**
|
|
* Deflate.msg -> String
|
|
*
|
|
* Error message, if [[Deflate.err]] != 0
|
|
**/
|
|
|
|
|
|
/**
|
|
* new Deflate(options)
|
|
* - options (Object): zlib deflate options.
|
|
*
|
|
* Creates new deflator instance with specified params. Throws exception
|
|
* on bad params. Supported options:
|
|
*
|
|
* - `level`
|
|
* - `windowBits`
|
|
* - `memLevel`
|
|
* - `strategy`
|
|
* - `dictionary`
|
|
*
|
|
* [http://zlib.net/manual.html#Advanced](http://zlib.net/manual.html#Advanced)
|
|
* for more information on these.
|
|
*
|
|
* Additional options, for internal needs:
|
|
*
|
|
* - `chunkSize` - size of generated data chunks (16K by default)
|
|
* - `raw` (Boolean) - do raw deflate
|
|
* - `gzip` (Boolean) - create gzip wrapper
|
|
* - `to` (String) - if equal to 'string', then result will be "binary string"
|
|
* (each char code [0..255])
|
|
* - `header` (Object) - custom header for gzip
|
|
* - `text` (Boolean) - true if compressed data believed to be text
|
|
* - `time` (Number) - modification time, unix timestamp
|
|
* - `os` (Number) - operation system code
|
|
* - `extra` (Array) - array of bytes with extra data (max 65536)
|
|
* - `name` (String) - file name (binary string)
|
|
* - `comment` (String) - comment (binary string)
|
|
* - `hcrc` (Boolean) - true if header crc should be added
|
|
*
|
|
* ##### Example:
|
|
*
|
|
* ```javascript
|
|
* var pako = require('pako')
|
|
* , chunk1 = Uint8Array([1,2,3,4,5,6,7,8,9])
|
|
* , chunk2 = Uint8Array([10,11,12,13,14,15,16,17,18,19]);
|
|
*
|
|
* var deflate = new pako.Deflate({ level: 3});
|
|
*
|
|
* deflate.push(chunk1, false);
|
|
* deflate.push(chunk2, true); // true -> last chunk
|
|
*
|
|
* if (deflate.err) { throw new Error(deflate.err); }
|
|
*
|
|
* console.log(deflate.result);
|
|
* ```
|
|
**/
|
|
function Deflate(options) {
|
|
if (!(this instanceof Deflate)) return new Deflate(options);
|
|
|
|
this.options = utils.assign({
|
|
level: Z_DEFAULT_COMPRESSION,
|
|
method: Z_DEFLATED,
|
|
chunkSize: 16384,
|
|
windowBits: 15,
|
|
memLevel: 8,
|
|
strategy: Z_DEFAULT_STRATEGY,
|
|
to: ''
|
|
}, options || {});
|
|
|
|
var opt = this.options;
|
|
|
|
if (opt.raw && (opt.windowBits > 0)) {
|
|
opt.windowBits = -opt.windowBits;
|
|
}
|
|
|
|
else if (opt.gzip && (opt.windowBits > 0) && (opt.windowBits < 16)) {
|
|
opt.windowBits += 16;
|
|
}
|
|
|
|
this.err = 0; // error code, if happens (0 = Z_OK)
|
|
this.msg = ''; // error message
|
|
this.ended = false; // used to avoid multiple onEnd() calls
|
|
this.chunks = []; // chunks of compressed data
|
|
|
|
this.strm = new ZStream();
|
|
this.strm.avail_out = 0;
|
|
|
|
var status = zlib_deflate.deflateInit2(
|
|
this.strm,
|
|
opt.level,
|
|
opt.method,
|
|
opt.windowBits,
|
|
opt.memLevel,
|
|
opt.strategy
|
|
);
|
|
|
|
if (status !== Z_OK) {
|
|
throw new Error(msg[status]);
|
|
}
|
|
|
|
if (opt.header) {
|
|
zlib_deflate.deflateSetHeader(this.strm, opt.header);
|
|
}
|
|
|
|
if (opt.dictionary) {
|
|
var dict;
|
|
// Convert data if needed
|
|
if (typeof opt.dictionary === 'string') {
|
|
// If we need to compress text, change encoding to utf8.
|
|
dict = strings.string2buf(opt.dictionary);
|
|
} else if (toString.call(opt.dictionary) === '[object ArrayBuffer]') {
|
|
dict = new Uint8Array(opt.dictionary);
|
|
} else {
|
|
dict = opt.dictionary;
|
|
}
|
|
|
|
status = zlib_deflate.deflateSetDictionary(this.strm, dict);
|
|
|
|
if (status !== Z_OK) {
|
|
throw new Error(msg[status]);
|
|
}
|
|
|
|
this._dict_set = true;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Deflate#push(data[, mode]) -> Boolean
|
|
* - data (Uint8Array|Array|ArrayBuffer|String): input data. Strings will be
|
|
* converted to utf8 byte sequence.
|
|
* - mode (Number|Boolean): 0..6 for corresponding Z_NO_FLUSH..Z_TREE modes.
|
|
* See constants. Skipped or `false` means Z_NO_FLUSH, `true` means Z_FINISH.
|
|
*
|
|
* Sends input data to deflate pipe, generating [[Deflate#onData]] calls with
|
|
* new compressed chunks. Returns `true` on success. The last data block must have
|
|
* mode Z_FINISH (or `true`). That will flush internal pending buffers and call
|
|
* [[Deflate#onEnd]]. For interim explicit flushes (without ending the stream) you
|
|
* can use mode Z_SYNC_FLUSH, keeping the compression context.
|
|
*
|
|
* On fail call [[Deflate#onEnd]] with error code and return false.
|
|
*
|
|
* We strongly recommend to use `Uint8Array` on input for best speed (output
|
|
* array format is detected automatically). Also, don't skip last param and always
|
|
* use the same type in your code (boolean or number). That will improve JS speed.
|
|
*
|
|
* For regular `Array`-s make sure all elements are [0..255].
|
|
*
|
|
* ##### Example
|
|
*
|
|
* ```javascript
|
|
* push(chunk, false); // push one of data chunks
|
|
* ...
|
|
* push(chunk, true); // push last chunk
|
|
* ```
|
|
**/
|
|
Deflate.prototype.push = function (data, mode) {
|
|
var strm = this.strm;
|
|
var chunkSize = this.options.chunkSize;
|
|
var status, _mode;
|
|
|
|
if (this.ended) { return false; }
|
|
|
|
_mode = (mode === ~~mode) ? mode : ((mode === true) ? Z_FINISH : Z_NO_FLUSH);
|
|
|
|
// Convert data if needed
|
|
if (typeof data === 'string') {
|
|
// If we need to compress text, change encoding to utf8.
|
|
strm.input = strings.string2buf(data);
|
|
} else if (toString.call(data) === '[object ArrayBuffer]') {
|
|
strm.input = new Uint8Array(data);
|
|
} else {
|
|
strm.input = data;
|
|
}
|
|
|
|
strm.next_in = 0;
|
|
strm.avail_in = strm.input.length;
|
|
|
|
do {
|
|
if (strm.avail_out === 0) {
|
|
strm.output = new utils.Buf8(chunkSize);
|
|
strm.next_out = 0;
|
|
strm.avail_out = chunkSize;
|
|
}
|
|
status = zlib_deflate.deflate(strm, _mode); /* no bad return value */
|
|
|
|
if (status !== Z_STREAM_END && status !== Z_OK) {
|
|
this.onEnd(status);
|
|
this.ended = true;
|
|
return false;
|
|
}
|
|
if (strm.avail_out === 0 || (strm.avail_in === 0 && (_mode === Z_FINISH || _mode === Z_SYNC_FLUSH))) {
|
|
if (this.options.to === 'string') {
|
|
this.onData(strings.buf2binstring(utils.shrinkBuf(strm.output, strm.next_out)));
|
|
} else {
|
|
this.onData(utils.shrinkBuf(strm.output, strm.next_out));
|
|
}
|
|
}
|
|
} while ((strm.avail_in > 0 || strm.avail_out === 0) && status !== Z_STREAM_END);
|
|
|
|
// Finalize on the last chunk.
|
|
if (_mode === Z_FINISH) {
|
|
status = zlib_deflate.deflateEnd(this.strm);
|
|
this.onEnd(status);
|
|
this.ended = true;
|
|
return status === Z_OK;
|
|
}
|
|
|
|
// callback interim results if Z_SYNC_FLUSH.
|
|
if (_mode === Z_SYNC_FLUSH) {
|
|
this.onEnd(Z_OK);
|
|
strm.avail_out = 0;
|
|
return true;
|
|
}
|
|
|
|
return true;
|
|
};
|
|
|
|
|
|
/**
|
|
* Deflate#onData(chunk) -> Void
|
|
* - chunk (Uint8Array|Array|String): output data. Type of array depends
|
|
* on js engine support. When string output requested, each chunk
|
|
* will be string.
|
|
*
|
|
* By default, stores data blocks in `chunks[]` property and glue
|
|
* those in `onEnd`. Override this handler, if you need another behaviour.
|
|
**/
|
|
Deflate.prototype.onData = function (chunk) {
|
|
this.chunks.push(chunk);
|
|
};
|
|
|
|
|
|
/**
|
|
* Deflate#onEnd(status) -> Void
|
|
* - status (Number): deflate status. 0 (Z_OK) on success,
|
|
* other if not.
|
|
*
|
|
* Called once after you tell deflate that the input stream is
|
|
* complete (Z_FINISH) or should be flushed (Z_SYNC_FLUSH)
|
|
* or if an error happened. By default - join collected chunks,
|
|
* free memory and fill `results` / `err` properties.
|
|
**/
|
|
Deflate.prototype.onEnd = function (status) {
|
|
// On success - join
|
|
if (status === Z_OK) {
|
|
if (this.options.to === 'string') {
|
|
this.result = this.chunks.join('');
|
|
} else {
|
|
this.result = utils.flattenChunks(this.chunks);
|
|
}
|
|
}
|
|
this.chunks = [];
|
|
this.err = status;
|
|
this.msg = this.strm.msg;
|
|
};
|
|
|
|
|
|
/**
|
|
* deflate(data[, options]) -> Uint8Array|Array|String
|
|
* - data (Uint8Array|Array|String): input data to compress.
|
|
* - options (Object): zlib deflate options.
|
|
*
|
|
* Compress `data` with deflate algorithm and `options`.
|
|
*
|
|
* Supported options are:
|
|
*
|
|
* - level
|
|
* - windowBits
|
|
* - memLevel
|
|
* - strategy
|
|
* - dictionary
|
|
*
|
|
* [http://zlib.net/manual.html#Advanced](http://zlib.net/manual.html#Advanced)
|
|
* for more information on these.
|
|
*
|
|
* Sugar (options):
|
|
*
|
|
* - `raw` (Boolean) - say that we work with raw stream, if you don't wish to specify
|
|
* negative windowBits implicitly.
|
|
* - `to` (String) - if equal to 'string', then result will be "binary string"
|
|
* (each char code [0..255])
|
|
*
|
|
* ##### Example:
|
|
*
|
|
* ```javascript
|
|
* var pako = require('pako')
|
|
* , data = Uint8Array([1,2,3,4,5,6,7,8,9]);
|
|
*
|
|
* console.log(pako.deflate(data));
|
|
* ```
|
|
**/
|
|
function deflate(input, options) {
|
|
var deflator = new Deflate(options);
|
|
|
|
deflator.push(input, true);
|
|
|
|
// That will never happens, if you don't cheat with options :)
|
|
if (deflator.err) { throw deflator.msg || msg[deflator.err]; }
|
|
|
|
return deflator.result;
|
|
}
|
|
|
|
|
|
/**
|
|
* deflateRaw(data[, options]) -> Uint8Array|Array|String
|
|
* - data (Uint8Array|Array|String): input data to compress.
|
|
* - options (Object): zlib deflate options.
|
|
*
|
|
* The same as [[deflate]], but creates raw data, without wrapper
|
|
* (header and adler32 crc).
|
|
**/
|
|
function deflateRaw(input, options) {
|
|
options = options || {};
|
|
options.raw = true;
|
|
return deflate(input, options);
|
|
}
|
|
|
|
|
|
/**
|
|
* gzip(data[, options]) -> Uint8Array|Array|String
|
|
* - data (Uint8Array|Array|String): input data to compress.
|
|
* - options (Object): zlib deflate options.
|
|
*
|
|
* The same as [[deflate]], but create gzip wrapper instead of
|
|
* deflate one.
|
|
**/
|
|
function gzip(input, options) {
|
|
options = options || {};
|
|
options.gzip = true;
|
|
return deflate(input, options);
|
|
}
|
|
|
|
|
|
exports.Deflate = Deflate;
|
|
exports.deflate = deflate;
|
|
exports.deflateRaw = deflateRaw;
|
|
exports.gzip = gzip;
|
|
|
|
},{"./utils/common":1,"./utils/strings":2,"./zlib/deflate":5,"./zlib/messages":6,"./zlib/zstream":8}]},{},[])("/lib/deflate.js")
|
|
}); |