Sha256: e60457f1250ad8d7cd327e1e8a4f668c8379fdf17735aaa395d27e6e34193d33
Contents?: true
Size: 793 Bytes
Versions: 9
Compression:
Stored size: 793 Bytes
Contents
'use strict';
// Note: we can't get significant speed boost here.
// So write code to minimize size - no pregenerated tables
// and array tools dependencies.
// Use ordinary array, since untyped makes no boost here
function makeTable() {
var c, table = [];
for (var n =0; n < 256; n++) {
c = n;
for (var k =0; k < 8; k++) {
c = ((c&1) ? (0xEDB88320 ^ (c >>> 1)) : (c >>> 1));
}
table[n] = c;
}
return table;
}
// Create table on load. Just 255 signed longs. Not a problem.
var crcTable = makeTable();
function crc32(crc, buf, len, pos) {
var t = crcTable,
end = pos + len;
crc = crc ^ (-1);
for (var i = pos; i < end; i++) {
crc = (crc >>> 8) ^ t[(crc ^ buf[i]) & 0xFF];
}
return (crc ^ (-1)); // >>> 0;
}
module.exports = crc32;
Version data entries
9 entries across 9 versions & 2 rubygems