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| Current File : //proc/self/root/home/saurabh/.npm/_npx/249ca9fcd30c476a/node_modules/pngjs/lib/crc.js |
'use strict';
var crcTable = [];
(function() {
for (var i = 0; i < 256; i++) {
var currentCrc = i;
for (var j = 0; j < 8; j++) {
if (currentCrc & 1) {
currentCrc = 0xedb88320 ^ (currentCrc >>> 1);
}
else {
currentCrc = currentCrc >>> 1;
}
}
crcTable[i] = currentCrc;
}
}());
var CrcCalculator = module.exports = function() {
this._crc = -1;
};
CrcCalculator.prototype.write = function(data) {
for (var 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) {
var crc = -1;
for (var i = 0; i < buf.length; i++) {
crc = crcTable[(crc ^ buf[i]) & 0xff] ^ (crc >>> 8);
}
return crc ^ -1;
};
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