/* putbits.c, bit-level output                                              *//* Copyright (C) 1996, MPEG Software Simulation Group. All Rights Reserved. *//* * Disclaimer of Warranty * * These software programs are available to the user without any license fee or * royalty on an "as is" basis.  The MPEG Software Simulation Group disclaims * any and all warranties, whether express, implied, or statuary, including any * implied warranties or merchantability or of fitness for a particular * purpose.  In no event shall the copyright-holder be liable for any * incidental, punitive, or consequential damages of any kind whatsoever * arising from the use of these programs. * * This disclaimer of warranty extends to the user of these programs and user's * customers, employees, agents, transferees, successors, and assigns. * * The MPEG Software Simulation Group does not represent or warrant that the * programs furnished hereunder are free of infringement of any third-party * patents. * * Commercial implementations of MPEG-1 and MPEG-2 video, including shareware, * are subject to royalty fees to patent holders.  Many of these patents are * general enough such that they are unavoidable regardless of implementation * design. * */#include <stdio.h>#include "config.h"extern FILE *outfile; /* the only global var we need here *//* private data */static unsigned char outbfr;static int outcnt;static int bytecnt;/* initialize buffer, call once before first putbits or alignbits */void initbits(){  outcnt = 8;  bytecnt = 0;}/* write rightmost n (0<=n<=32) bits of val to outfile */void putbits(val,n)int val;int n;{  int i;  unsigned int mask;  mask = 1 << (n-1); /* selects first (leftmost) bit */  for (i=0; i<n; i++)  {    outbfr <<= 1;    if (val & mask)      outbfr|= 1;    mask >>= 1; /* select next bit */    outcnt--;    if (outcnt==0) /* 8 bit buffer full */    {      putc(outbfr,outfile);      outcnt = 8;      bytecnt++;    }  }}/* zero bit stuffing to next byte boundary (5.2.3, 6.2.1) */void alignbits(){  if (outcnt!=8)    putbits(0,outcnt);}/* return total number of generated bits */int bitcount(){  return 8*bytecnt + (8-outcnt);}