67 lines
1.8 KiB
C
67 lines
1.8 KiB
C
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/*\
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* bitio.h - bitstream I/O
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*
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* Works for (sizeof(unsigned long)-1)*8 bits.
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*
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* Copyright (C) 1992 by David W. Sanderson.
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*
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* Permission to use, copy, modify, and distribute this software and its
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* documentation for any purpose and without fee is hereby granted,
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* provided that the above copyright notice appear in all copies and
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* that both that copyright notice and this permission notice appear
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* in supporting documentation. This software is provided "as is"
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* without express or implied warranty.
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\*/
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#ifndef _BITIO_H_
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#define _BITIO_H_
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#include "pandabase.h"
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#include "pnmimage_base.h"
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typedef struct bitstream *BITSTREAM;
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/*
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* pm_bitinit() - allocate and return a BITSTREAM for the given FILE*.
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*
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* mode must be one of "r" or "w", according to whether you will be
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* reading from or writing to the BITSTREAM.
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*
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* Returns 0 on error.
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*/
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extern EXPCL_PANDA_PNMIMAGE BITSTREAM pm_bitinit(std::istream *f, const char *mode);
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extern EXPCL_PANDA_PNMIMAGE BITSTREAM pm_bitinit(std::ostream *f, const char *mode);
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/*
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* pm_bitfini() - deallocate the given BITSTREAM.
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*
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* You must call this after you are done with the BITSTREAM.
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*
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* It may flush some bits left in the buffer.
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*
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* Returns the number of bytes written, -1 on error.
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*/
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extern EXPCL_PANDA_PNMIMAGE int pm_bitfini(BITSTREAM b);
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/*
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* pm_bitread() - read the next nbits into *val from the given file.
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*
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* Returns the number of bytes read, -1 on error.
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*/
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extern EXPCL_PANDA_PNMIMAGE int pm_bitread(BITSTREAM b, unsigned long nbits, unsigned long *val);
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/*
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* pm_bitwrite() - write the low nbits of val to the given file.
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*
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* The last pm_bitwrite() must be followed by a call to pm_bitflush().
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*
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* Returns the number of bytes written, -1 on error.
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*/
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extern EXPCL_PANDA_PNMIMAGE int pm_bitwrite(BITSTREAM b, unsigned long nbits, unsigned long val);
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#endif /* _BITIO_H_ */
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