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Viewing file:     util.js (1.95 KB)      -rw-r--r--

/**
 * node-compress-commons
 *
 * Copyright (c) 2014 Chris Talkington, contributors.
 * Licensed under the MIT license.
 * https://github.com/archiverjs/node-compress-commons/blob/master/LICENSE-MIT
 */
var util = module.exports = {};

util.dateToDos = function(d, forceLocalTime) {
  forceLocalTime = forceLocalTime || false;

  var year = forceLocalTime ? d.getFullYear() : d.getUTCFullYear();

  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: forceLocalTime ? d.getMonth() : d.getUTCMonth(),
    date: forceLocalTime ? d.getDate() : d.getUTCDate(),
    hours: forceLocalTime ? d.getHours() : d.getUTCHours(),
    minutes: forceLocalTime ? d.getMinutes() : d.getUTCMinutes(),
    seconds: forceLocalTime ? d.getSeconds() : d.getUTCSeconds()
  };

  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(0));
};

util.getEightBytes = function(v) {
  var buf = Buffer.alloc(8);
  buf.writeUInt32LE(v % 0x0100000000, 0);
  buf.writeUInt32LE((v / 0x0100000000) | 0, 4);

  return buf;
};

util.getShortBytes = function(v) {
  var buf = Buffer.alloc(2);
  buf.writeUInt16LE((v & 0xFFFF) >>> 0, 0);

  return buf;
};

util.getShortBytesValue = function(buf, offset) {
  return buf.readUInt16LE(offset);
};

util.getLongBytes = function(v) {
  var buf = Buffer.alloc(4);
  buf.writeUInt32LE((v & 0xFFFFFFFF) >>> 0, 0);

  return buf;
};

util.getLongBytesValue = function(buf, offset) {
  return buf.readUInt32LE(offset);
};

util.toDosTime = function(d) {
  return util.getLongBytes(util.dateToDos(d));
};