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zipFile.js
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zipFile.js
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var ZipEntry = require("./zipEntry"),
Headers = require("./headers");
Utils = require("./util");
module.exports = function(/*Buffer*/buf) {
var entryList = [],
entryTable = {},
_comment = '',
endHeader = new Headers.MainHeader();
if (buf) {
readMainHeader();
}
function readEntries() {
entryTable = {};
entryList = new Array(endHeader.diskEntries); // total number of entries
var index = endHeader.offset; // offset of first CEN header
for(var i = 0; i < entryList.length; i++) {
var tmp = index,
entry = new ZipEntry();
entry.header = buf.slice(tmp, tmp += Utils.Constants.CENHDR);
entry.entryName = buf.toString('utf8', tmp, tmp += entry.header.fileNameLength);
if (entry.header.extraLength)
entry.extra = buf.slice(tmp, tmp += entry.header.extraLength);
if (entry.header.commentLength)
entry.comment = buf.toString('utf8', tmp, tmp + entry.header.commentLength);
index += entry.header.entryHeaderSize;
if (!entry.isDirectory) {
// read data
entry.setCompressedData(buf.slice(entry.header.offset, entry.header.offset + Utils.Constants.LOCHDR + entry.header.compressedSize + entry.entryName.length));
}
entryList[i] = entry;
entryTable[entry.entryName] = entry;
}
}
function readMainHeader() {
var i = buf.length - Utils.Constants.ENDHDR, // END header size
n = Math.max(0, i - 0xFFFF), // 0xFFFF is the max zip file comment length
endOffset = 0; // Start offset of the END header
for (i; i >= n; i--) {
if (buf[i] != 0x50) continue; // quick check that the byte is 'P'
if (buf.readUInt32LE(i) == Utils.Constants.ENDSIG) { // "PK\005\006"
endOffset = i;
break;
}
}
if (!endOffset)
throw Utils.Errors.INVALID_FORMAT;
endHeader.loadFromBinary(buf.slice(endOffset, endOffset + Utils.Constants.ENDHDR));
if (endHeader.commentLength) {
_comment = buf.toString('utf8', 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; },
set comment(val) {
endHeader.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;
endHeader.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.slice(entryList.indexOf(entry), 1);
delete(entryTable[entryName]);
endHeader.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
*/
toBuffer : function() {
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,
data = [],
header = [],
dindex = 0;
endHeader.size = 0;
endHeader.offset = 0;
entryList.forEach(function(entry) {
entry.header.offset = dindex;
var compressedData = entry.getCompressedData();
dindex += compressedData.length;
data.push(compressedData);
var headerData = entry.packHeader();
header.push(headerData);
endHeader.size += headerData.length;
totalSize += compressedData.length + headerData.length;
});
totalSize += endHeader.mainHeaderSize;
// point to end of data and begining of central directory first record
endHeader.offset = dindex;
dindex = 0;
var outBuffer = new Buffer(totalSize);
data.forEach(function(content) {
content.copy(outBuffer, dindex); // write data
dindex += content.length;
});
header.forEach(function(content) {
content.copy(outBuffer, dindex); // write data
dindex += content.length;
});
var mainHeader = endHeader.toBinary();
if (_comment) {
mainHeader.write(_comment, Utils.Constants.ENDHDR);
}
mainHeader.copy(outBuffer, dindex);
return outBuffer
},
toAsyncBuffer : function(/*Function*/callback) {
}
}
};