All files crc.js

100% Statements 26/26
100% Branches 2/2
100% Functions 5/5
100% Lines 22/22

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41    1x   1x 1x 256x 256x 2048x 1024x   1024x     256x       1x 2461x     1x 4839x 823519x   4839x     1x 2195x     1x 1592x 1592x 305287x   1592x    
"use strict";
 
let crcTable = [];
 
(function () {
  for (let i = 0; i < 256; i++) {
    let currentCrc = i;
    for (let j = 0; j < 8; j++) {
      if (currentCrc & 1) {
        currentCrc = 0xedb88320 ^ (currentCrc >>> 1);
      } else {
        currentCrc = currentCrc >>> 1;
      }
    }
    crcTable[i] = currentCrc;
  }
})();
 
let CrcCalculator = (module.exports = function () {
  this._crc = -1;
});
 
CrcCalculator.prototype.write = function (data) {
  for (let i = 0; i < data.length; i++) {
    this._crc = crcTable[(this._crc ^ data[i]) & 0xff] ^ (this._crc >>> 8);
  }
  return true;
};
 
CrcCalculator.prototype.crc32 = function () {
  return this._crc ^ -1;
};
 
CrcCalculator.crc32 = function (buf) {
  let crc = -1;
  for (let i = 0; i < buf.length; i++) {
    crc = crcTable[(crc ^ buf[i]) & 0xff] ^ (crc >>> 8);
  }
  return crc ^ -1;
};