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Diffstat (limited to 'src/libs/xpcom18a4/nsprpub/pr/include/prbit.h')
| -rw-r--r-- | src/libs/xpcom18a4/nsprpub/pr/include/prbit.h | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/src/libs/xpcom18a4/nsprpub/pr/include/prbit.h b/src/libs/xpcom18a4/nsprpub/pr/include/prbit.h new file mode 100644 index 00000000..4b112271 --- /dev/null +++ b/src/libs/xpcom18a4/nsprpub/pr/include/prbit.h @@ -0,0 +1,117 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* ***** BEGIN LICENSE BLOCK ***** + * Version: MPL 1.1/GPL 2.0/LGPL 2.1 + * + * The contents of this file are subject to the Mozilla Public License Version + * 1.1 (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * http://www.mozilla.org/MPL/ + * + * Software distributed under the License is distributed on an "AS IS" basis, + * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License + * for the specific language governing rights and limitations under the + * License. + * + * The Original Code is the Netscape Portable Runtime (NSPR). + * + * The Initial Developer of the Original Code is + * Netscape Communications Corporation. + * Portions created by the Initial Developer are Copyright (C) 1998-2000 + * the Initial Developer. All Rights Reserved. + * + * Contributor(s): + * + * Alternatively, the contents of this file may be used under the terms of + * either the GNU General Public License Version 2 or later (the "GPL"), or + * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), + * in which case the provisions of the GPL or the LGPL are applicable instead + * of those above. If you wish to allow use of your version of this file only + * under the terms of either the GPL or the LGPL, and not to allow others to + * use your version of this file under the terms of the MPL, indicate your + * decision by deleting the provisions above and replace them with the notice + * and other provisions required by the GPL or the LGPL. If you do not delete + * the provisions above, a recipient may use your version of this file under + * the terms of any one of the MPL, the GPL or the LGPL. + * + * ***** END LICENSE BLOCK ***** */ + +#ifndef prbit_h___ +#define prbit_h___ + +#include "prtypes.h" + +#ifdef VBOX_WITH_XPCOM_NAMESPACE_CLEANUP +#define PR_CeilingLog2 VBoxNsprPR_CeilingLog2 +#define PR_FloorLog2 VBoxNsprPR_FloorLog2 +#endif /* VBOX_WITH_XPCOM_NAMESPACE_CLEANUP */ + +PR_BEGIN_EXTERN_C + +/* +** A prbitmap_t is a long integer that can be used for bitmaps +*/ +typedef unsigned long prbitmap_t; + +#define PR_TEST_BIT(_map,_bit) \ + ((_map)[(_bit)>>PR_BITS_PER_LONG_LOG2] & (1L << ((_bit) & (PR_BITS_PER_LONG-1)))) +#define PR_SET_BIT(_map,_bit) \ + ((_map)[(_bit)>>PR_BITS_PER_LONG_LOG2] |= (1L << ((_bit) & (PR_BITS_PER_LONG-1)))) +#define PR_CLEAR_BIT(_map,_bit) \ + ((_map)[(_bit)>>PR_BITS_PER_LONG_LOG2] &= ~(1L << ((_bit) & (PR_BITS_PER_LONG-1)))) + +/* +** Compute the log of the least power of 2 greater than or equal to n +*/ +NSPR_API(PRIntn) PR_CeilingLog2(PRUint32 i); + +/* +** Compute the log of the greatest power of 2 less than or equal to n +*/ +NSPR_API(PRIntn) PR_FloorLog2(PRUint32 i); + +/* +** Macro version of PR_CeilingLog2: Compute the log of the least power of +** 2 greater than or equal to _n. The result is returned in _log2. +*/ +#define PR_CEILING_LOG2(_log2,_n) \ + PR_BEGIN_MACRO \ + PRUint32 j_ = (PRUint32)(_n); \ + (_log2) = 0; \ + if ((j_) & ((j_)-1)) \ + (_log2) += 1; \ + if ((j_) >> 16) \ + (_log2) += 16, (j_) >>= 16; \ + if ((j_) >> 8) \ + (_log2) += 8, (j_) >>= 8; \ + if ((j_) >> 4) \ + (_log2) += 4, (j_) >>= 4; \ + if ((j_) >> 2) \ + (_log2) += 2, (j_) >>= 2; \ + if ((j_) >> 1) \ + (_log2) += 1; \ + PR_END_MACRO + +/* +** Macro version of PR_FloorLog2: Compute the log of the greatest power of +** 2 less than or equal to _n. The result is returned in _log2. +** +** This is equivalent to finding the highest set bit in the word. +*/ +#define PR_FLOOR_LOG2(_log2,_n) \ + PR_BEGIN_MACRO \ + PRUint32 j_ = (PRUint32)(_n); \ + (_log2) = 0; \ + if ((j_) >> 16) \ + (_log2) += 16, (j_) >>= 16; \ + if ((j_) >> 8) \ + (_log2) += 8, (j_) >>= 8; \ + if ((j_) >> 4) \ + (_log2) += 4, (j_) >>= 4; \ + if ((j_) >> 2) \ + (_log2) += 2, (j_) >>= 2; \ + if ((j_) >> 1) \ + (_log2) += 1; \ + PR_END_MACRO + +PR_END_EXTERN_C +#endif /* prbit_h___ */ |