Sha256: 5e813740d6f7e0d2f5f73711d8f0da8b9e1b7e7747e53e3ca104e369ba0bb052
Contents?: true
Size: 691 Bytes
Versions: 62
Compression:
Stored size: 691 Bytes
Contents
'use strict';
// Note: adler32 takes 12% for level 0 and 2% for level 6.
// It doesn't worth to make additional optimizationa as in original.
// Small size is preferable.
function adler32(adler, buf, len, pos) {
var s1 = (adler & 0xffff) |0
, s2 = ((adler >>> 16) & 0xffff) |0
, n = 0;
while (len !== 0) {
// Set limit ~ twice less than 5552, to keep
// s2 in 31-bits, because we force signed ints.
// in other case %= will fail.
n = len > 2000 ? 2000 : len;
len -= n;
do {
s1 = (s1 + buf[pos++]) |0;
s2 = (s2 + s1) |0;
} while (--n);
s1 %= 65521;
s2 %= 65521;
}
return (s1 | (s2 << 16)) |0;
}
module.exports = adler32;
Version data entries
62 entries across 62 versions & 1 rubygems