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| 1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* | |
| 3 * The contents of this file are subject to the Mozilla Public | |
| 4 * License Version 1.1 (the "License"); you may not use this file | |
| 5 * except in compliance with the License. You may obtain a copy of | |
| 6 * the License at http://www.mozilla.org/MPL/ | |
| 7 * | |
| 8 * Software distributed under the License is distributed on an "AS | |
| 9 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or | |
| 10 * implied. See the License for the specific language governing | |
| 11 * rights and limitations under the License. | |
| 12 * | |
| 13 * The Original Code is the Netscape Portable Runtime (NSPR). | |
| 14 * | |
| 15 * The Initial Developer of the Original Code is Netscape | |
| 16 * Communications Corporation. Portions created by Netscape are | |
| 17 * Copyright (C) 1998-2000 Netscape Communications Corporation. All | |
| 18 * Rights Reserved. | |
| 19 * | |
| 20 * Contributor(s): | |
| 21 * | |
| 22 * Alternatively, the contents of this file may be used under the | |
| 23 * terms of the GNU General Public License Version 2 or later (the | |
| 24 * "GPL"), in which case the provisions of the GPL are applicable | |
| 25 * instead of those above. If you wish to allow use of your | |
| 26 * version of this file only under the terms of the GPL and not to | |
| 27 * allow others to use your version of this file under the MPL, | |
| 28 * indicate your decision by deleting the provisions above and | |
| 29 * replace them with the notice and other provisions required by | |
| 30 * the GPL. If you do not delete the provisions above, a recipient | |
| 31 * may use your version of this file under either the MPL or the | |
| 32 * GPL. | |
| 33 */ | |
| 34 | |
| 35 #ifndef prbit_h___ | |
| 36 #define prbit_h___ | |
| 37 | |
| 38 #include "prtypes.h" | |
| 39 PR_BEGIN_EXTERN_C | |
| 40 | |
| 41 /* | |
| 42 ** A prbitmap_t is a long integer that can be used for bitmaps | |
| 43 */ | |
| 44 typedef unsigned long prbitmap_t; | |
| 45 | |
| 46 #define PR_TEST_BIT(_map,_bit) \ | |
| 47 ((_map)[(_bit)>>PR_BITS_PER_LONG_LOG2] & (1L << ((_bit) & (PR_BITS_PER_LONG-
1)))) | |
| 48 #define PR_SET_BIT(_map,_bit) \ | |
| 49 ((_map)[(_bit)>>PR_BITS_PER_LONG_LOG2] |= (1L << ((_bit) & (PR_BITS_PER_LONG
-1)))) | |
| 50 #define PR_CLEAR_BIT(_map,_bit) \ | |
| 51 ((_map)[(_bit)>>PR_BITS_PER_LONG_LOG2] &= ~(1L << ((_bit) & (PR_BITS_PER_LON
G-1)))) | |
| 52 | |
| 53 /* | |
| 54 ** Compute the log of the least power of 2 greater than or equal to n | |
| 55 */ | |
| 56 NSPR_API(PRIntn) PR_CeilingLog2(PRUint32 i); | |
| 57 | |
| 58 /* | |
| 59 ** Compute the log of the greatest power of 2 less than or equal to n | |
| 60 */ | |
| 61 NSPR_API(PRIntn) PR_FloorLog2(PRUint32 i); | |
| 62 | |
| 63 /* | |
| 64 ** Macro version of PR_CeilingLog2: Compute the log of the least power of | |
| 65 ** 2 greater than or equal to _n. The result is returned in _log2. | |
| 66 */ | |
| 67 #define PR_CEILING_LOG2(_log2,_n) \ | |
| 68 PR_BEGIN_MACRO \ | |
| 69 PRUint32 j_ = (PRUint32)(_n); \ | |
| 70 (_log2) = 0; \ | |
| 71 if ((j_) & ((j_)-1)) \ | |
| 72 (_log2) += 1; \ | |
| 73 if ((j_) >> 16) \ | |
| 74 (_log2) += 16, (j_) >>= 16; \ | |
| 75 if ((j_) >> 8) \ | |
| 76 (_log2) += 8, (j_) >>= 8; \ | |
| 77 if ((j_) >> 4) \ | |
| 78 (_log2) += 4, (j_) >>= 4; \ | |
| 79 if ((j_) >> 2) \ | |
| 80 (_log2) += 2, (j_) >>= 2; \ | |
| 81 if ((j_) >> 1) \ | |
| 82 (_log2) += 1; \ | |
| 83 PR_END_MACRO | |
| 84 | |
| 85 /* | |
| 86 ** Macro version of PR_FloorLog2: Compute the log of the greatest power of | |
| 87 ** 2 less than or equal to _n. The result is returned in _log2. | |
| 88 ** | |
| 89 ** This is equivalent to finding the highest set bit in the word. | |
| 90 */ | |
| 91 #define PR_FLOOR_LOG2(_log2,_n) \ | |
| 92 PR_BEGIN_MACRO \ | |
| 93 PRUint32 j_ = (PRUint32)(_n); \ | |
| 94 (_log2) = 0; \ | |
| 95 if ((j_) >> 16) \ | |
| 96 (_log2) += 16, (j_) >>= 16; \ | |
| 97 if ((j_) >> 8) \ | |
| 98 (_log2) += 8, (j_) >>= 8; \ | |
| 99 if ((j_) >> 4) \ | |
| 100 (_log2) += 4, (j_) >>= 4; \ | |
| 101 if ((j_) >> 2) \ | |
| 102 (_log2) += 2, (j_) >>= 2; \ | |
| 103 if ((j_) >> 1) \ | |
| 104 (_log2) += 1; \ | |
| 105 PR_END_MACRO | |
| 106 | |
| 107 PR_END_EXTERN_C | |
| 108 #endif /* prbit_h___ */ | |
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Chromium Code Reviews
Issue 665543002:
Remove third_party/npapi/npspy. (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master