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/**
* JSON Format Plugin
*
* @module plugins/json
* @license [MIT]{@link https://github.com/archiverjs/node-archiver/blob/master/LICENSE}
* @copyright (c) 2012-2014 Chris Talkington, contributors.
*/
var inherits = require('util').inherits;
var Transform = require('readable-stream').Transform;
var crc32 = require('buffer-crc32');
var util = require('archiver-utils');
/**
* @constructor
* @param {(JsonOptions|TransformOptions)} options
*/
var Json = function(options) {
if (!(this instanceof Json)) {
return new Json(options);
}
options = this.options = util.defaults(options, {});
Transform.call(this, options);
this.supports = {
directory: true
};
this.files = [];
};
inherits(Json, Transform);
/**
* [_transform description]
*
* @private
* @param {Buffer} chunk
* @param {String} encoding
* @param {Function} callback
* @return void
*/
Json.prototype._transform = function(chunk, encoding, callback) {
callback(null, chunk);
};
/**
* [_writeStringified description]
*
* @private
* @return void
*/
Json.prototype._writeStringified = function() {
var fileString = JSON.stringify(this.files);
this.write(fileString);
};
/**
* [append description]
*
* @param {(Buffer|Stream)} source
* @param {EntryData} data
* @param {Function} callback
* @return void
*/
Json.prototype.append = function(source, data, callback) {
var self = this;
data.crc32 = 0;
function onend(err, sourceBuffer) {
if (err) {
callback(err);
return;
}
data.size = sourceBuffer.length || 0;
data.crc32 = crc32.unsigned(sourceBuffer);
self.files.push(data);
callback(null, data);
}
if (data.sourceType === 'buffer') {
onend(null, source);
} else if (data.sourceType === 'stream') {
util.collectStream(source, onend);
}
};
/**
* [finalize description]
*
* @return void
*/
Json.prototype.finalize = function() {
this._writeStringified();
this.end();
};
module.exports = Json;
/**
* @typedef {Object} JsonOptions
* @global
*/
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