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33 lines
885 B
33 lines
885 B
10 years ago
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/**
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* Copyright 2013-2015, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*
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* @providesModule adler32
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*/
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/* jslint bitwise:true */
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'use strict';
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var MOD = 65521;
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// This is a clean-room implementation of adler32 designed for detecting
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// if markup is not what we expect it to be. It does not need to be
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// cryptographically strong, only reasonably good at detecting if markup
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// generated on the server is different than that on the client.
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function adler32(data) {
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var a = 1;
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var b = 0;
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for (var i = 0; i < data.length; i++) {
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a = (a + data.charCodeAt(i)) % MOD;
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b = (b + a) % MOD;
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}
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return a | (b << 16);
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}
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module.exports = adler32;
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