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