/* getbit.h -- bit-buffer access This file is part of the UCL data compression library. Copyright (C) 1996-2002 Markus Franz Xaver Johannes Oberhumer All Rights Reserved. The UCL library is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. The UCL library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with the UCL library; see the file COPYING. If not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. Markus F.X.J. Oberhumer http://www.oberhumer.com/opensource/ucl/ */ /*********************************************************************** // ************************************************************************/ #if 1 #define getbit_8(bb, src, ilen) \ (((bb = bb & 0x7f ? bb*2 : ((unsigned)src[ilen++]*2+1)) >> 8) & 1) #elif 1 #define getbit_8(bb, src, ilen) \ (bb*=2,bb&0xff ? (bb>>8)&1 : ((bb=src[ilen++]*2+1)>>8)&1) #else #define getbit_8(bb, src, ilen) \ (((bb*=2, (bb&0xff ? bb : (bb=src[ilen++]*2+1,bb))) >> 8) & 1) #endif #define getbit_le16(bb, src, ilen) \ (bb*=2,bb&0xffff ? (bb>>16)&1 : (ilen+=2,((bb=(src[ilen-2]+src[ilen-1]*256u)*2+1)>>16)&1)) #if 1 && defined(UCL_UNALIGNED_OK_4) && (UCL_BYTE_ORDER == UCL_LITTLE_ENDIAN) #define getbit_le32(bb, bc, src, ilen) \ (bc > 0 ? ((bb>>--bc)&1) : (bc=31,\ bb=*(const ucl_uint32p)((src)+ilen),ilen+=4,(bb>>31)&1)) #else #define getbit_le32(bb, bc, src, ilen) \ (bc > 0 ? ((bb>>--bc)&1) : (bc=31,\ bb=src[ilen]+src[ilen+1]*0x100+src[ilen+2]*UCL_UINT32_C(0x10000)+src[ilen+3]*UCL_UINT32_C(0x1000000),\ ilen+=4,(bb>>31)&1)) #endif /* vi:ts=4:et */