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  1. /* getbit.h -- bit-buffer access
  2.  
  3.    This file is part of the UCL data compression library.
  4.  
  5.    Copyright (C) 1996-2004 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 && (ACC_ENDIAN_LITTLE_ENDIAN) && defined(UA_GET4)
  50. #define getbit_le32(bb, bc, src, ilen) \
  51.     (bc > 0 ? ((bb>>--bc)&1) : (bc=31,\
  52.     bb=UA_GET4((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.  
  65.