/** | |
* node-compress-commons | |
* | |
* Copyright (c) 2014 Chris Talkington, contributors. | |
* Licensed under the MIT license. | |
* https://github.com/ctalkington/node-compress-commons/blob/master/LICENSE-MIT | |
*/ | |
var util = module.exports = {}; | |
util.dateToDos = function(d) { | |
var year = d.getFullYear(); | |
if (year < 1980) { | |
return 2162688; // 1980-1-1 00:00:00 | |
} else if (year >= 2044) { | |
return 2141175677; // 2043-12-31 23:59:58 | |
} | |
var val = { | |
year: year, | |
month: d.getMonth(), | |
date: d.getDate(), | |
hours: d.getHours(), | |
minutes: d.getMinutes(), | |
seconds: d.getSeconds() | |
}; | |
return ((val.year - 1980) << 25) | ((val.month + 1) << 21) | (val.date << 16) | | |
(val.hours << 11) | (val.minutes << 5) | (val.seconds / 2); | |
}; | |
util.dosToDate = function(dos) { | |
return new Date( | |
((dos >> 25) & 0x7f) + 1980, | |
((dos >> 21) & 0x0f) - 1, | |
(dos >> 16) & 0x1f, | |
(dos >> 11) & 0x1f, | |
(dos >> 5) & 0x3f, | |
(dos & 0x1f) << 1 | |
); | |
}; | |
util.fromDosTime = function(buf) { | |
return util.dosToDate(buf.readUInt32LE()); | |
}; | |
util.getShortBytes = function(v) { | |
var buf = new Buffer(2); | |
buf.writeUInt16LE(v, 0); | |
return buf; | |
}; | |
util.getShortBytesValue = function(buf, offset) { | |
return buf.readUInt16LE(offset); | |
}; | |
util.getLongBytes = function(v) { | |
var buf = new Buffer(4); | |
buf.writeUInt32LE(v, 0); | |
return buf; | |
}; | |
util.getLongBytesValue = function(buf, offset) { | |
return buf.readUInt32LE(offset); | |
}; | |
util.toDosTime = function(d) { | |
return util.getLongBytes(util.dateToDos(d)); | |
}; |