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| 1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file |
| 2 // for details. All rights reserved. Use of this source code is governed by a | 2 // for details. All rights reserved. Use of this source code is governed by a |
| 3 // BSD-style license that can be found in the LICENSE file. | 3 // BSD-style license that can be found in the LICENSE file. |
| 4 | 4 part of dart.math; |
| 5 part of "math.dart"; | |
| 6 | 5 |
| 7 /** | 6 /** |
| 8 * This is the [Jenkins hash function][1] but using masking to keep | 7 * This is the [Jenkins hash function][1] but using masking to keep |
| 9 * values in SMI range. | 8 * values in SMI range. |
| 10 * | 9 * |
| 11 * [1]: http://en.wikipedia.org/wiki/Jenkins_hash_function | 10 * [1]: http://en.wikipedia.org/wiki/Jenkins_hash_function |
| 12 * | 11 * |
| 13 * Use: | 12 * Use: |
| 14 * Hash each value with the hash of the previous value, then get the final | 13 * Hash each value with the hash of the previous value, then get the final |
| 15 * hash by calling finish. | 14 * hash by calling finish. |
| (...skipping 17 matching lines...) Expand all Loading... |
| 33 hash = 0x1fffffff & (hash + ((0x03ffffff & hash) << 3)); | 32 hash = 0x1fffffff & (hash + ((0x03ffffff & hash) << 3)); |
| 34 hash = hash ^ (hash >> 11); | 33 hash = hash ^ (hash >> 11); |
| 35 return 0x1fffffff & (hash + ((0x00003fff & hash) << 15)); | 34 return 0x1fffffff & (hash + ((0x00003fff & hash) << 15)); |
| 36 } | 35 } |
| 37 | 36 |
| 38 static int hash2(a, b) => finish(combine(combine(0, a), b)); | 37 static int hash2(a, b) => finish(combine(combine(0, a), b)); |
| 39 | 38 |
| 40 static int hash4(a, b, c, d) => | 39 static int hash4(a, b, c, d) => |
| 41 finish(combine(combine(combine(combine(0, a), b), c), d)); | 40 finish(combine(combine(combine(combine(0, a), b), c), d)); |
| 42 } | 41 } |
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