/*	getbits	copyright ?-2006 by the mpg123 project - free software under the terms of the LGPL 2.1	see COPYING and AUTHORS files in distribution or http://mpg123.de	initially written by Michael Hipp*/#include "config.h"#include "mpg123.h"#include "common.h"#if 0static void check_buffer_range(int size){	int pos = (bsi.wordpointer-bsbuf) + (size>>3);	if( pos >= fsizeold) {		fprintf(stderr,"Pointer out of range (%d,%d)!\n",pos,fsizeold);	}}#endifvoid backbits(int number_of_bits){  bsi.bitindex    -= number_of_bits;  bsi.wordpointer += (bsi.bitindex>>3);  bsi.bitindex    &= 0x7;}int getbitoffset(void) {  return (-bsi.bitindex)&0x7;}int getbyte(void){#ifdef DEBUG_GETBITS  if(bsi.bitindex)     fprintf(stderr,"getbyte called unsynched!\n");#endif  return *bsi.wordpointer++;}unsigned int getbits(int number_of_bits){  unsigned long rval;#ifdef DEBUG_GETBITSfprintf(stderr,"g%d",number_of_bits);#endif  if(!number_of_bits)    return 0;#if 0   check_buffer_range(number_of_bits+bsi.bitindex);#endif  {    rval = bsi.wordpointer[0];    rval <<= 8;    rval |= bsi.wordpointer[1];    rval <<= 8;    rval |= bsi.wordpointer[2];    rval <<= bsi.bitindex;    rval &= 0xffffff;    bsi.bitindex += number_of_bits;    rval >>= (24-number_of_bits);    bsi.wordpointer += (bsi.bitindex>>3);    bsi.bitindex &= 7;  }#ifdef DEBUG_GETBITSfprintf(stderr,":%x ",rval);#endif  return rval;}unsigned int getbits_fast(int number_of_bits){  unsigned int rval;#ifdef DEBUG_GETBITSfprintf(stderr,"g%d",number_of_bits);#endif#if 0   check_buffer_range(number_of_bits+bsi.bitindex);#endif  rval =  (unsigned char) (bsi.wordpointer[0] << bsi.bitindex);  rval |= ((unsigned int) bsi.wordpointer[1]<<bsi.bitindex)>>8;  rval <<= number_of_bits;  rval >>= 8;  bsi.bitindex += number_of_bits;  bsi.wordpointer += (bsi.bitindex>>3);  bsi.bitindex &= 7;#ifdef DEBUG_GETBITSfprintf(stderr,":%x ",rval);#endif  return rval;}unsigned int get1bit(void){  unsigned char rval;#ifdef DEBUG_GETBITSfprintf(stderr,"g%d",1);#endif#if 0   check_buffer_range(1+bsi.bitindex);#endif  rval = *bsi.wordpointer << bsi.bitindex;  bsi.bitindex++;  bsi.wordpointer += (bsi.bitindex>>3);  bsi.bitindex &= 7;#ifdef DEBUG_GETBITSfprintf(stderr,":%d ",rval>>7);#endif  return rval>>7;}