mirror of
https://github.com/swc-project/swc.git
synced 2024-12-01 01:13:56 +03:00
57 lines
1.9 KiB
TypeScript
57 lines
1.9 KiB
TypeScript
// Loaded from https://dev.jspm.io/npm:pako@1.0.11/lib/zlib/adler32.dew.js
|
|
|
|
|
|
var exports = {},
|
|
_dewExec = false;
|
|
export function dew() {
|
|
if (_dewExec) return exports;
|
|
_dewExec = true;
|
|
|
|
// Note: adler32 takes 12% for level 0 and 2% for level 6.
|
|
// It isn't worth it to make additional optimizations as in original.
|
|
// Small size is preferable.
|
|
// (C) 1995-2013 Jean-loup Gailly and Mark Adler
|
|
// (C) 2014-2017 Vitaly Puzrin and Andrey Tupitsin
|
|
//
|
|
// This software is provided 'as-is', without any express or implied
|
|
// warranty. In no event will the authors be held liable for any damages
|
|
// arising from the use of this software.
|
|
//
|
|
// Permission is granted to anyone to use this software for any purpose,
|
|
// including commercial applications, and to alter it and redistribute it
|
|
// freely, subject to the following restrictions:
|
|
//
|
|
// 1. The origin of this software must not be misrepresented; you must not
|
|
// claim that you wrote the original software. If you use this software
|
|
// in a product, an acknowledgment in the product documentation would be
|
|
// appreciated but is not required.
|
|
// 2. Altered source versions must be plainly marked as such, and must not be
|
|
// misrepresented as being the original software.
|
|
// 3. This notice may not be removed or altered from any source distribution.
|
|
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;
|
|
}
|
|
|
|
exports = adler32;
|
|
return exports;
|
|
} |