appjs-package
Version:
module for handling AppJS packaged applications
133 lines (118 loc) • 4.95 kB
JavaScript
var Utils = require("../util"),
Constants = Utils.Constants;
/* The local file header */
module.exports = function () {
var _version = 0x0A,
_flags = 0,
_method = 0,
_time = 0,
_crc = 0,
_compressedSize = 0,
_size = 0,
_fnameLen = 0,
_extraLen = 0;
return {
get version () { return _version; },
set version (val) { _version = 0x0A },
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) {
val = new Date(val);
_time = (val.getFullYear() - 1980 & 0x7f) << 25
| (val.getMonth() + 1) << 21
| val.getDay() << 16
| val.getHours() << 11
| val.getMinutes() << 5
| val.getSeconds() >> 1;
},
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 fileNameLenght (val) { _fnameLen = val; },
get extraLength () { return _extraLen },
set extraLength (val) { _extraLen = val; },
get encripted () { return (_flags & 1) == 1 },
get fileHeaderSize () {
return Constants.LOCHDR + _fnameLen + _extraLen;
},
loadFromBinary : function(/*Buffer*/data) {
// 30 bytes and should start with "PK\003\004"
if (data.length != Constants.LOCHDR || data.readUInt32LE(0) != Constants.LOCSIG) {
throw Utils.Errors.INVALID_LOC;
}
// 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);
},
toBinary : 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;
},
toString : function() {
return '{\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"fnameLen" : ' + _fnameLen + ",\n" +
'\t"extraLen" : ' + _extraLen + " bytes,\n" +
'\t"fileHeaderSize" : ' + (Constants.LOCHDR + _fnameLen + _extraLen) + " bytes\n" +
'}';
}
}
};