var ZipEntry = require("./zipEntry"),
Headers = require("./headers"),
Utils = require("./util");
module.exports = function(/*String|Buffer*/input, /*Number*/inputType) {
var entryList = [],
entryTable = {},
_comment = new Buffer(0),
filename = "",
fs = require("fs"),
inBuffer = null,
mainHeader = new Headers.MainHeader();
if (inputType == Utils.Constants.FILE) {
// is a filename
filename = input;
inBuffer = fs.readFileSync(filename);
readMainHeader();
} else if (inputType == Utils.Constants.BUFFER) {
// is a memory buffer
inBuffer = input;
readMainHeader();
} else {
// none. is a new file
}
function readEntries() {
entryTable = {};
entryList = new Array(mainHeader.diskEntries); // total number of entries
var index = mainHeader.offset; // offset of first CEN header
for(var i = 0; i < entryList.length; i++) {
var tmp = index,
entry = new ZipEntry(inBuffer);
entry.header = inBuffer.slice(tmp, tmp += Utils.Constants.CENHDR);
entry.entryName = inBuffer.slice(tmp, tmp += entry.header.fileNameLength);
if (entry.header.extraLength) {
entry.extra = inBuffer.slice(tmp, tmp += entry.header.extraLength);
}
if (entry.header.commentLength)
entry.comment = inBuffer.slice(tmp, tmp + entry.header.commentLength);
index += entry.header.entryHeaderSize;
entryList[i] = entry;
entryTable[entry.entryName] = entry;
}
}
function readMainHeader() {
var i = inBuffer.length - Utils.Constants.ENDHDR, // END header size
n = Math.max(0, i - 0xFFFF), // 0xFFFF is the max zip file comment length
endOffset = -1; // Start offset of the END header
for (i; i >= n; i--) {
if (inBuffer[i] != 0x50) continue; // quick check that the byte is 'P'
if (inBuffer.readUInt32LE(i) == Utils.Constants.ENDSIG) { // "PK\005\006"
endOffset = i;
break;
}
}
if (!~endOffset)
throw Utils.Errors.INVALID_FORMAT;
mainHeader.loadFromBinary(inBuffer.slice(endOffset, endOffset + Utils.Constants.ENDHDR));
if (mainHeader.commentLength) {
_comment = inBuffer.slice(endOffset + Utils.Constants.ENDHDR);
}
readEntries();
}
return {
/**
* Returns an array of ZipEntry objects existent in the current opened archive
* @return Array
*/
get entries () {
return entryList;
},
/**
* Archive comment
* @return {String}
*/
get comment () { return _comment.toString(); },
set comment(val) {
mainHeader.commentLength = val.length;
_comment = val;
},
/**
* Returns a reference to the entry with the given name or null if entry is inexistent
*
* @param entryName
* @return ZipEntry
*/
getEntry : function(/*String*/entryName) {
return entryTable[entryName] || null;
},
/**
* Adds the given entry to the entry list
*
* @param entry
*/
setEntry : function(/*ZipEntry*/entry) {
entryList.push(entry);
entryTable[entry.entryName] = entry;
mainHeader.totalEntries = entryList.length;
},
/**
* Removes the entry with the given name from the entry list.
*
* If the entry is a directory, then all nested files and directories will be removed
* @param entryName
*/
deleteEntry : function(/*String*/entryName) {
var entry = entryTable[entryName];
if (entry && entry.isDirectory) {
var _self = this;
this.getEntryChildren(entry).forEach(function(child) {
if (child.entryName != entryName) {
_self.deleteEntry(child.entryName)
}
})
}
entryList.splice(entryList.indexOf(entry), 1);
delete(entryTable[entryName]);
mainHeader.totalEntries = entryList.length;
},
/**
* Iterates and returns all nested files and directories of the given entry
*
* @param entry
* @return Array
*/
getEntryChildren : function(/*ZipEntry*/entry) {
if (entry.isDirectory) {
var list = [],
name = entry.entryName,
len = name.length;
entryList.forEach(function(zipEntry) {
if (zipEntry.entryName.substr(0, len) == name) {
list.push(zipEntry);
}
});
return list;
}
return []
},
/**
* Returns the zip file
*
* @return Buffer
*/
compressToBuffer : function() {
if (entryList.length > 1) {
entryList.sort(function(a, b) {
var nameA = a.entryName.toLowerCase();
var nameB = b.entryName.toLowerCase();
if (nameA < nameB) {return -1}
if (nameA > nameB) {return 1}
return 0;
});
}
var totalSize = 0,
dataBlock = [],
entryHeaders = [],
dindex = 0;
mainHeader.size = 0;
mainHeader.offset = 0;
entryList.forEach(function(entry) {
entry.header.offset = dindex;
// compress data and set local and entry header accordingly. Reason why is called first
var compressedData = entry.getCompressedData();
// data header
var dataHeader = entry.header.dataHeaderToBinary();
var postHeader = new Buffer(entry.entryName + entry.extra.toString());
var dataLength = dataHeader.length + postHeader.length + compressedData.length;
dindex += dataLength;
dataBlock.push(dataHeader);
dataBlock.push(postHeader);
dataBlock.push(compressedData);
var entryHeader = entry.packHeader();
entryHeaders.push(entryHeader);
mainHeader.size += entryHeader.length;
totalSize += (dataLength + entryHeader.length);
});
totalSize += mainHeader.mainHeaderSize; // also includes zip file comment length
// point to end of data and begining of central directory first record
mainHeader.offset = dindex;
dindex = 0;
var outBuffer = new Buffer(totalSize);
dataBlock.forEach(function(content) {
content.copy(outBuffer, dindex); // write data blocks
dindex += content.length;
});
entryHeaders.forEach(function(content) {
content.copy(outBuffer, dindex); // write central directory entries
dindex += content.length;
});
var mh = mainHeader.toBinary();
if (_comment) {
_comment.copy(mh, Utils.Constants.ENDHDR); // add zip file comment
}
mh.copy(outBuffer, dindex); // write main header
return outBuffer
},
toAsyncBuffer : function(/*Function*/onSuccess,/*Function*/onFail,/*Function*/onItemStart,/*Function*/onItemEnd) {
if (entryList.length > 1) {
entryList.sort(function(a, b) {
var nameA = a.entryName.toLowerCase();
var nameB = b.entryName.toLowerCase();
if (nameA > nameB) {return -1}
if (nameA < nameB) {return 1}
return 0;
});
}
var totalSize = 0,
dataBlock = [],
entryHeaders = [],
dindex = 0;
mainHeader.size = 0;
mainHeader.offset = 0;
var compress=function(entryList){
var self=arguments.callee;
var entry;
if(entryList.length){
var entry=entryList.pop();
var name=entry.entryName + entry.extra.toString();
if(onItemStart)onItemStart(name);
entry.getCompressedDataAsync(function(compressedData){
if(onItemEnd)onItemEnd(name);
entry.header.offset = dindex;
// data header
var dataHeader = entry.header.dataHeaderToBinary();
var postHeader = new Buffer(name);
var dataLength = dataHeader.length + postHeader.length + compressedData.length;
dindex += dataLength;
dataBlock.push(dataHeader);
dataBlock.push(postHeader);
dataBlock.push(compressedData);
var entryHeader = entry.packHeader();
entryHeaders.push(entryHeader);
mainHeader.size += entryHeader.length;
totalSize += (dataLength + entryHeader.length);
if(entryList.length){
self(entryList);
}else{
totalSize += mainHeader.mainHeaderSize; // also includes zip file comment length
// point to end of data and begining of central directory first record
mainHeader.offset = dindex;
dindex = 0;
var outBuffer = new Buffer(totalSize);
dataBlock.forEach(function(content) {
content.copy(outBuffer, dindex); // write data blocks
dindex += content.length;
});
entryHeaders.forEach(function(content) {
content.copy(outBuffer, dindex); // write central directory entries
dindex += content.length;
});
var mh = mainHeader.toBinary();
if (_comment) {
_comment.copy(mh, Utils.Constants.ENDHDR); // add zip file comment
}
mh.copy(outBuffer, dindex); // write main header
onSuccess(outBuffer);
}
});
}
};
compress(entryList);
}
}
};