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var Utils = require("../util"),
Constants = Utils.Constants;
/* The entries in the end of central directory */
module.exports = function () {
var _volumeEntries = 0,
_totalEntries = 0,
_size = 0,
_offset = 0,
_commentLength = 0;
return {
get diskEntries () { return _volumeEntries },
set diskEntries (/*Number*/val) { _volumeEntries = _totalEntries = val; },
get totalEntries () { return _totalEntries },
set totalEntries (/*Number*/val) { _totalEntries = _volumeEntries = val; },
get size () { return _size },
set size (/*Number*/val) { _size = val; },
get offset () { return _offset },
set offset (/*Number*/val) { _offset = val; },
get commentLength () { return _commentLength },
set commentLength (/*Number*/val) { _commentLength = val; },
get mainHeaderSize () {
return Constants.ENDHDR + _commentLength;
},
loadFromBinary : function(/*Buffer*/data) {
// data should be 22 bytes and start with "PK 05 06"
// or be 56+ bytes and start with "PK 06 06" for Zip64
if ((data.length !== Constants.ENDHDR || data.readUInt32LE(0) !== Constants.ENDSIG) &&
(data.length < Constants.ZIP64HDR || data.readUInt32LE(0) !== Constants.ZIP64SIG)) {
throw new Error(Utils.Errors.INVALID_END);
}
if (data.readUInt32LE(0) === Constants.ENDSIG) {
// number of entries on this volume
_volumeEntries = data.readUInt16LE(Constants.ENDSUB);
// total number of entries
_totalEntries = data.readUInt16LE(Constants.ENDTOT);
// central directory size in bytes
_size = data.readUInt32LE(Constants.ENDSIZ);
// offset of first CEN header
_offset = data.readUInt32LE(Constants.ENDOFF);
// zip file comment length
_commentLength = data.readUInt16LE(Constants.ENDCOM);
} else {
// number of entries on this volume
_volumeEntries = Utils.readBigUInt64LE(data, Constants.ZIP64SUB);
// total number of entries
_totalEntries = Utils.readBigUInt64LE(data, Constants.ZIP64TOT);
// central directory size in bytes
_size = Utils.readBigUInt64LE(data, Constants.ZIP64SIZ);
// offset of first CEN header
_offset = Utils.readBigUInt64LE(data, Constants.ZIP64OFF);
_commentLength = 0;
}
},
toBinary : function() {
var b = Buffer.alloc(Constants.ENDHDR + _commentLength);
// "PK 05 06" signature
b.writeUInt32LE(Constants.ENDSIG, 0);
b.writeUInt32LE(0, 4);
// number of entries on this volume
b.writeUInt16LE(_volumeEntries, Constants.ENDSUB);
// total number of entries
b.writeUInt16LE(_totalEntries, Constants.ENDTOT);
// central directory size in bytes
b.writeUInt32LE(_size, Constants.ENDSIZ);
// offset of first CEN header
b.writeUInt32LE(_offset, Constants.ENDOFF);
// zip file comment length
b.writeUInt16LE(_commentLength, Constants.ENDCOM);
// fill comment memory with spaces so no garbage is left there
b.fill(" ", Constants.ENDHDR);
return b;
},
toString : function() {
return '{\n' +
'\t"diskEntries" : ' + _volumeEntries + ",\n" +
'\t"totalEntries" : ' + _totalEntries + ",\n" +
'\t"size" : ' + _size + " bytes,\n" +
'\t"offset" : 0x' + _offset.toString(16).toUpperCase() + ",\n" +
'\t"commentLength" : 0x' + _commentLength + "\n" +
'}';
}
}
};