| var Utils = require("../util"), |
| Constants = Utils.Constants; |
| |
| /* The central directory file header */ |
| module.exports = function () { |
| var _verMade = 0x0A, |
| _version = 0x0A, |
| _flags = 0, |
| _method = 0, |
| _time = 0, |
| _crc = 0, |
| _compressedSize = 0, |
| _size = 0, |
| _fnameLen = 0, |
| _extraLen = 0, |
| |
| _comLen = 0, |
| _diskStart = 0, |
| _inattr = 0, |
| _attr = 0, |
| _offset = 0; |
| |
| var _dataHeader = {}; |
| |
| function setTime(val) { |
| var val = new Date(val); |
| _time = (val.getFullYear() - 1980 & 0x7f) << 25 // b09-16 years from 1980 |
| | (val.getMonth() + 1) << 21 // b05-08 month |
| | val.getDay() << 16 // b00-04 hour |
| |
| // 2 bytes time |
| | val.getHours() << 11 // b11-15 hour |
| | val.getMinutes() << 5 // b05-10 minute |
| | val.getSeconds() >> 1; // b00-04 seconds divided by 2 |
| } |
| |
| setTime(+new Date()); |
| |
| return { |
| get made () { return _verMade; }, |
| set made (val) { _verMade = val; }, |
| |
| get version () { return _version; }, |
| set version (val) { _version = val }, |
| |
| get flags () { return _flags }, |
| set flags (val) { _flags = val; }, |
| |
| get method () { return _method; }, |
| set method (val) { _method = val; }, |
| |
| get time () { return new Date( |
| ((_time >> 25) & 0x7f) + 1980, |
| ((_time >> 21) & 0x0f) - 1, |
| (_time >> 16) & 0x1f, |
| (_time >> 11) & 0x1f, |
| (_time >> 5) & 0x3f, |
| (_time & 0x1f) << 1 |
| ); |
| }, |
| set time (val) { |
| setTime(val); |
| }, |
| |
| get crc () { return _crc; }, |
| set crc (val) { _crc = val; }, |
| |
| get compressedSize () { return _compressedSize; }, |
| set compressedSize (val) { _compressedSize = val; }, |
| |
| get size () { return _size; }, |
| set size (val) { _size = val; }, |
| |
| get fileNameLength () { return _fnameLen; }, |
| set fileNameLength (val) { _fnameLen = val; }, |
| |
| get extraLength () { return _extraLen }, |
| set extraLength (val) { _extraLen = val; }, |
| |
| get commentLength () { return _comLen }, |
| set commentLength (val) { _comLen = val }, |
| |
| get diskNumStart () { return _diskStart }, |
| set diskNumStart (val) { _diskStart = val }, |
| |
| get inAttr () { return _inattr }, |
| set inAttr (val) { _inattr = val }, |
| |
| get attr () { return _attr }, |
| set attr (val) { _attr = val }, |
| |
| get offset () { return _offset }, |
| set offset (val) { _offset = val }, |
| |
| get encripted () { return (_flags & 1) == 1 }, |
| |
| get entryHeaderSize () { |
| return Constants.CENHDR + _fnameLen + _extraLen + _comLen; |
| }, |
| |
| get realDataOffset () { |
| return _offset + Constants.LOCHDR + _dataHeader.fnameLen + _dataHeader.extraLen; |
| }, |
| |
| get dataHeader () { |
| return _dataHeader; |
| }, |
| |
| loadDataHeaderFromBinary : function(/*Buffer*/input) { |
| var data = input.slice(_offset, _offset + Constants.LOCHDR); |
| // 30 bytes and should start with "PK\003\004" |
| if (data.readUInt32LE(0) != Constants.LOCSIG) { |
| throw Utils.Errors.INVALID_LOC; |
| } |
| _dataHeader = { |
| // version needed to extract |
| version : data.readUInt16LE(Constants.LOCVER), |
| // general purpose bit flag |
| flags : data.readUInt16LE(Constants.LOCFLG), |
| // compression method |
| method : data.readUInt16LE(Constants.LOCHOW), |
| // modification time (2 bytes time, 2 bytes date) |
| time : data.readUInt32LE(Constants.LOCTIM), |
| // uncompressed file crc-32 value |
| crc : data.readUInt32LE(Constants.LOCCRC), |
| // compressed size |
| compressedSize : data.readUInt32LE(Constants.LOCSIZ), |
| // uncompressed size |
| size : data.readUInt32LE(Constants.LOCLEN), |
| // filename length |
| fnameLen : data.readUInt16LE(Constants.LOCNAM), |
| // extra field length |
| extraLen : data.readUInt16LE(Constants.LOCEXT) |
| } |
| }, |
| |
| loadFromBinary : function(/*Buffer*/data) { |
| // data should be 46 bytes and start with "PK 01 02" |
| if (data.length != Constants.CENHDR || data.readUInt32LE(0) != Constants.CENSIG) { |
| throw Utils.Errors.INVALID_CEN; |
| } |
| // version made by |
| _verMade = data.readUInt16LE(Constants.CENVEM); |
| // version needed to extract |
| _version = data.readUInt16LE(Constants.CENVER); |
| // encrypt, decrypt flags |
| _flags = data.readUInt16LE(Constants.CENFLG); |
| // compression method |
| _method = data.readUInt16LE(Constants.CENHOW); |
| // modification time (2 bytes time, 2 bytes date) |
| _time = data.readUInt32LE(Constants.CENTIM); |
| // uncompressed file crc-32 value |
| _crc = data.readUInt32LE(Constants.CENCRC); |
| // compressed size |
| _compressedSize = data.readUInt32LE(Constants.CENSIZ); |
| // uncompressed size |
| _size = data.readUInt32LE(Constants.CENLEN); |
| // filename length |
| _fnameLen = data.readUInt16LE(Constants.CENNAM); |
| // extra field length |
| _extraLen = data.readUInt16LE(Constants.CENEXT); |
| // file comment length |
| _comLen = data.readUInt16LE(Constants.CENCOM); |
| // volume number start |
| _diskStart = data.readUInt16LE(Constants.CENDSK); |
| // internal file attributes |
| _inattr = data.readUInt16LE(Constants.CENATT); |
| // external file attributes |
| _attr = data.readUInt32LE(Constants.CENATX); |
| // LOC header offset |
| _offset = data.readUInt32LE(Constants.CENOFF); |
| }, |
| |
| dataHeaderToBinary : function() { |
| // LOC header size (30 bytes) |
| var data = new Buffer(Constants.LOCHDR); |
| // "PK\003\004" |
| data.writeUInt32LE(Constants.LOCSIG, 0); |
| // version needed to extract |
| data.writeUInt16LE(_version, Constants.LOCVER); |
| // general purpose bit flag |
| data.writeUInt16LE(_flags, Constants.LOCFLG); |
| // compression method |
| data.writeUInt16LE(_method, Constants.LOCHOW); |
| // modification time (2 bytes time, 2 bytes date) |
| data.writeUInt32LE(_time, Constants.LOCTIM); |
| // uncompressed file crc-32 value |
| data.writeUInt32LE(_crc, Constants.LOCCRC); |
| // compressed size |
| data.writeUInt32LE(_compressedSize, Constants.LOCSIZ); |
| // uncompressed size |
| data.writeUInt32LE(_size, Constants.LOCLEN); |
| // filename length |
| data.writeUInt16LE(_fnameLen, Constants.LOCNAM); |
| // extra field length |
| data.writeUInt16LE(_extraLen, Constants.LOCEXT); |
| return data; |
| }, |
| |
| entryHeaderToBinary : function() { |
| // CEN header size (46 bytes) |
| var data = new Buffer(Constants.CENHDR + _fnameLen + _extraLen + _comLen); |
| // "PK\001\002" |
| data.writeUInt32LE(Constants.CENSIG, 0); |
| // version made by |
| data.writeUInt16LE(_verMade, Constants.CENVEM); |
| // version needed to extract |
| data.writeUInt16LE(_version, Constants.CENVER); |
| // encrypt, decrypt flags |
| data.writeUInt16LE(_flags, Constants.CENFLG); |
| // compression method |
| data.writeUInt16LE(_method, Constants.CENHOW); |
| // modification time (2 bytes time, 2 bytes date) |
| data.writeUInt32LE(_time, Constants.CENTIM); |
| // uncompressed file crc-32 value |
| data.writeInt32LE(_crc, Constants.CENCRC, true); |
| // compressed size |
| data.writeUInt32LE(_compressedSize, Constants.CENSIZ); |
| // uncompressed size |
| data.writeUInt32LE(_size, Constants.CENLEN); |
| // filename length |
| data.writeUInt16LE(_fnameLen, Constants.CENNAM); |
| // extra field length |
| data.writeUInt16LE(_extraLen, Constants.CENEXT); |
| // file comment length |
| data.writeUInt16LE(_comLen, Constants.CENCOM); |
| // volume number start |
| data.writeUInt16LE(_diskStart, Constants.CENDSK); |
| // internal file attributes |
| data.writeUInt16LE(_inattr, Constants.CENATT); |
| // external file attributes |
| data.writeUInt32LE(_attr, Constants.CENATX); |
| // LOC header offset |
| data.writeUInt32LE(_offset, Constants.CENOFF); |
| // fill all with |
| data.fill(0x00, Constants.CENHDR); |
| return data; |
| }, |
| |
| toString : function() { |
| return '{\n' + |
| '\t"made" : ' + _verMade + ",\n" + |
| '\t"version" : ' + _version + ",\n" + |
| '\t"flags" : ' + _flags + ",\n" + |
| '\t"method" : ' + Utils.methodToString(_method) + ",\n" + |
| '\t"time" : ' + _time + ",\n" + |
| '\t"crc" : 0x' + _crc.toString(16).toUpperCase() + ",\n" + |
| '\t"compressedSize" : ' + _compressedSize + " bytes,\n" + |
| '\t"size" : ' + _size + " bytes,\n" + |
| '\t"fileNameLength" : ' + _fnameLen + ",\n" + |
| '\t"extraLength" : ' + _extraLen + " bytes,\n" + |
| '\t"commentLength" : ' + _comLen + " bytes,\n" + |
| '\t"diskNumStart" : ' + _diskStart + ",\n" + |
| '\t"inAttr" : ' + _inattr + ",\n" + |
| '\t"attr" : ' + _attr + ",\n" + |
| '\t"offset" : ' + _offset + ",\n" + |
| '\t"entryHeaderSize" : ' + (Constants.CENHDR + _fnameLen + _extraLen + _comLen) + " bytes\n" + |
| '}'; |
| } |
| } |
| }; |
