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authorMinteck <contact@minteck.org>2023-02-23 19:34:56 +0100
committerMinteck <contact@minteck.org>2023-02-23 19:34:56 +0100
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tree75be5fba4368472fb11c8015aee026b2b9a71888 /includes/external/school/node_modules/pako/lib/zlib/adler32.js
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+'use strict';
+
+// 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;
+}
+
+
+module.exports = adler32;