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74 lines
1.9 KiB
74 lines
1.9 KiB
2 years ago
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/**
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* node-compress-commons
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*
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* Copyright (c) 2014 Chris Talkington, contributors.
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* Licensed under the MIT license.
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* https://github.com/archiverjs/node-compress-commons/blob/master/LICENSE-MIT
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*/
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var util = module.exports = {};
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util.dateToDos = function(d, forceLocalTime) {
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forceLocalTime = forceLocalTime || false;
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var year = forceLocalTime ? d.getFullYear() : d.getUTCFullYear();
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if (year < 1980) {
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return 2162688; // 1980-1-1 00:00:00
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} else if (year >= 2044) {
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return 2141175677; // 2043-12-31 23:59:58
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}
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var val = {
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year: year,
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month: forceLocalTime ? d.getMonth() : d.getUTCMonth(),
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date: forceLocalTime ? d.getDate() : d.getUTCDate(),
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hours: forceLocalTime ? d.getHours() : d.getUTCHours(),
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minutes: forceLocalTime ? d.getMinutes() : d.getUTCMinutes(),
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seconds: forceLocalTime ? d.getSeconds() : d.getUTCSeconds()
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};
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return ((val.year - 1980) << 25) | ((val.month + 1) << 21) | (val.date << 16) |
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(val.hours << 11) | (val.minutes << 5) | (val.seconds / 2);
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};
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util.dosToDate = function(dos) {
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return new Date(((dos >> 25) & 0x7f) + 1980, ((dos >> 21) & 0x0f) - 1, (dos >> 16) & 0x1f, (dos >> 11) & 0x1f, (dos >> 5) & 0x3f, (dos & 0x1f) << 1);
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};
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util.fromDosTime = function(buf) {
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return util.dosToDate(buf.readUInt32LE(0));
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};
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util.getEightBytes = function(v) {
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var buf = Buffer.alloc(8);
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buf.writeUInt32LE(v % 0x0100000000, 0);
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buf.writeUInt32LE((v / 0x0100000000) | 0, 4);
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return buf;
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};
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util.getShortBytes = function(v) {
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var buf = Buffer.alloc(2);
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buf.writeUInt16LE((v & 0xFFFF) >>> 0, 0);
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return buf;
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};
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util.getShortBytesValue = function(buf, offset) {
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return buf.readUInt16LE(offset);
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};
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util.getLongBytes = function(v) {
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var buf = Buffer.alloc(4);
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buf.writeUInt32LE((v & 0xFFFFFFFF) >>> 0, 0);
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return buf;
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};
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util.getLongBytesValue = function(buf, offset) {
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return buf.readUInt32LE(offset);
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};
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util.toDosTime = function(d) {
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return util.getLongBytes(util.dateToDos(d));
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};
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