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32 lines
885 B
32 lines
885 B
/** |
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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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