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Diffstat (limited to 'tools/ucl/src/getbit.h')
-rw-r--r-- | tools/ucl/src/getbit.h | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/tools/ucl/src/getbit.h b/tools/ucl/src/getbit.h new file mode 100644 index 0000000000..be27254cd4 --- /dev/null +++ b/tools/ucl/src/getbit.h | |||
@@ -0,0 +1,64 @@ | |||
1 | /* getbit.h -- bit-buffer access | ||
2 | |||
3 | This file is part of the UCL data compression library. | ||
4 | |||
5 | Copyright (C) 1996-2002 Markus Franz Xaver Johannes Oberhumer | ||
6 | All Rights Reserved. | ||
7 | |||
8 | The UCL library is free software; you can redistribute it and/or | ||
9 | modify it under the terms of the GNU General Public License as | ||
10 | published by the Free Software Foundation; either version 2 of | ||
11 | the License, or (at your option) any later version. | ||
12 | |||
13 | The UCL library is distributed in the hope that it will be useful, | ||
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
16 | GNU General Public License for more details. | ||
17 | |||
18 | You should have received a copy of the GNU General Public License | ||
19 | along with the UCL library; see the file COPYING. | ||
20 | If not, write to the Free Software Foundation, Inc., | ||
21 | 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | ||
22 | |||
23 | Markus F.X.J. Oberhumer | ||
24 | <markus@oberhumer.com> | ||
25 | http://www.oberhumer.com/opensource/ucl/ | ||
26 | */ | ||
27 | |||
28 | |||
29 | /*********************************************************************** | ||
30 | // | ||
31 | ************************************************************************/ | ||
32 | |||
33 | #if 1 | ||
34 | #define getbit_8(bb, src, ilen) \ | ||
35 | (((bb = bb & 0x7f ? bb*2 : ((unsigned)src[ilen++]*2+1)) >> 8) & 1) | ||
36 | #elif 1 | ||
37 | #define getbit_8(bb, src, ilen) \ | ||
38 | (bb*=2,bb&0xff ? (bb>>8)&1 : ((bb=src[ilen++]*2+1)>>8)&1) | ||
39 | #else | ||
40 | #define getbit_8(bb, src, ilen) \ | ||
41 | (((bb*=2, (bb&0xff ? bb : (bb=src[ilen++]*2+1,bb))) >> 8) & 1) | ||
42 | #endif | ||
43 | |||
44 | |||
45 | #define getbit_le16(bb, src, ilen) \ | ||
46 | (bb*=2,bb&0xffff ? (bb>>16)&1 : (ilen+=2,((bb=(src[ilen-2]+src[ilen-1]*256u)*2+1)>>16)&1)) | ||
47 | |||
48 | |||
49 | #if 1 && defined(UCL_UNALIGNED_OK_4) && (UCL_BYTE_ORDER == UCL_LITTLE_ENDIAN) | ||
50 | #define getbit_le32(bb, bc, src, ilen) \ | ||
51 | (bc > 0 ? ((bb>>--bc)&1) : (bc=31,\ | ||
52 | bb=*(const ucl_uint32p)((src)+ilen),ilen+=4,(bb>>31)&1)) | ||
53 | #else | ||
54 | #define getbit_le32(bb, bc, src, ilen) \ | ||
55 | (bc > 0 ? ((bb>>--bc)&1) : (bc=31,\ | ||
56 | bb=src[ilen]+src[ilen+1]*0x100+src[ilen+2]*UCL_UINT32_C(0x10000)+src[ilen+3]*UCL_UINT32_C(0x1000000),\ | ||
57 | ilen+=4,(bb>>31)&1)) | ||
58 | #endif | ||
59 | |||
60 | |||
61 | /* | ||
62 | vi:ts=4:et | ||
63 | */ | ||
64 | |||