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/*\ * $Id: bitio.h,v 1.4 1992/11/24 19:37:02 dws Exp dws $ * * bitio.h - bitstream I/O * * Works for (sizeof(unsigned long)-1)*8 bits. * * Copyright (C) 1992 by David W. Sanderson. * * Permission to use, copy, modify, and distribute this software and its * documentation for any purpose and without fee is hereby granted, * provided that the above copyright notice appear in all copies and * that both that copyright notice and this permission notice appear * in supporting documentation. This software is provided "as is" * without express or implied warranty. * * $Log: bitio.h,v $ * Revision 1.4 1992/11/24 19:37:02 dws * Added copyright * * Revision 1.3 1992/11/17 03:37:59 dws * updated comment * * Revision 1.2 1992/11/10 23:10:22 dws * Generalized to handle more than one bitstream at a time. * * Revision 1.1 1992/11/10 18:33:51 dws * Initial revision * \*/ #ifndef _BITIO_H_ #define _BITIO_H_ #include "pbmplus.h" typedef struct bitstream *BITSTREAM; /* * pm_bitinit() - allocate and return a BITSTREAM for the given FILE*. * * mode must be one of "r" or "w", according to whether you will be * reading from or writing to the BITSTREAM. * * Returns 0 on error. */ extern BITSTREAM pm_bitinit ARGS((FILE *f, char *mode)); /* * pm_bitfini() - deallocate the given BITSTREAM. * * You must call this after you are done with the BITSTREAM. * * It may flush some bits left in the buffer. * * Returns the number of bytes written, -1 on error. */ extern int pm_bitfini ARGS((BITSTREAM b)); /* * pm_bitread() - read the next nbits into *val from the given file. * * Returns the number of bytes read, -1 on error. */ extern int pm_bitread ARGS((BITSTREAM b, unsigned long nbits, unsigned long *val)); /* * pm_bitwrite() - write the low nbits of val to the given file. * * The last pm_bitwrite() must be followed by a call to pm_bitflush(). * * Returns the number of bytes written, -1 on error. */ extern int pm_bitwrite ARGS((BITSTREAM b, unsigned long nbits, unsigned long val)); #endif /* _BITIO_H_ */
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