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| 26 | pmbaty | 1 | /* getbit.h -- bit-buffer access |
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| 3 | This file is part of the UCL data compression library. |
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| 5 | Copyright (C) 1996-2004 Markus Franz Xaver Johannes Oberhumer |
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| 6 | All Rights Reserved. |
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| 7 | |||
| 8 | The UCL library is free software; you can redistribute it and/or |
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| 9 | modify it under the terms of the GNU General Public License as |
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| 10 | published by the Free Software Foundation; either version 2 of |
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| 11 | the License, or (at your option) any later version. |
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| 12 | |||
| 13 | The UCL library is distributed in the hope that it will be useful, |
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| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 16 | GNU General Public License for more details. |
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| 17 | |||
| 18 | You should have received a copy of the GNU General Public License |
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| 19 | along with the UCL library; see the file COPYING. |
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| 20 | If not, write to the Free Software Foundation, Inc., |
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| 21 | 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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| 22 | |||
| 23 | Markus F.X.J. Oberhumer |
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| 24 | <markus@oberhumer.com> |
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| 25 | http://www.oberhumer.com/opensource/ucl/ |
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| 26 | */ |
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| 27 | |||
| 28 | |||
| 29 | /*********************************************************************** |
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| 30 | // |
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| 31 | ************************************************************************/ |
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| 32 | |||
| 33 | #if 1 |
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| 34 | #define getbit_8(bb, src, ilen) \ |
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| 35 | (((bb = bb & 0x7f ? bb*2 : ((unsigned)src[ilen++]*2+1)) >> 8) & 1) |
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| 36 | #elif 1 |
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| 37 | #define getbit_8(bb, src, ilen) \ |
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| 38 | (bb*=2,bb&0xff ? (bb>>8)&1 : ((bb=src[ilen++]*2+1)>>8)&1) |
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| 39 | #else |
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| 40 | #define getbit_8(bb, src, ilen) \ |
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| 41 | (((bb*=2, (bb&0xff ? bb : (bb=src[ilen++]*2+1,bb))) >> 8) & 1) |
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| 42 | #endif |
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| 43 | |||
| 44 | |||
| 45 | #define getbit_le16(bb, src, ilen) \ |
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| 46 | (bb*=2,bb&0xffff ? (bb>>16)&1 : (ilen+=2,((bb=(src[ilen-2]+src[ilen-1]*256u)*2+1)>>16)&1)) |
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| 47 | |||
| 48 | |||
| 49 | #if 1 && (ACC_ENDIAN_LITTLE_ENDIAN) && defined(UA_GET4) |
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| 50 | #define getbit_le32(bb, bc, src, ilen) \ |
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| 51 | (bc > 0 ? ((bb>>--bc)&1) : (bc=31,\ |
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| 52 | bb=UA_GET4((src)+ilen),ilen+=4,(bb>>31)&1)) |
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| 53 | #else |
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| 54 | #define getbit_le32(bb, bc, src, ilen) \ |
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| 55 | (bc > 0 ? ((bb>>--bc)&1) : (bc=31,\ |
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| 56 | bb=src[ilen]+src[ilen+1]*0x100+src[ilen+2]*UCL_UINT32_C(0x10000)+src[ilen+3]*UCL_UINT32_C(0x1000000),\ |
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| 57 | ilen+=4,(bb>>31)&1)) |
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| 58 | #endif |
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| 59 | |||
| 60 | |||
| 61 | /* |
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| 62 | vi:ts=4:et |
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| 63 | */ |
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| 64 |