231 lines
8.6 KiB
C
231 lines
8.6 KiB
C
/*
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* Copyright (c) 1999-2000 Image Power, Inc. and the University of
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* British Columbia.
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* Copyright (c) 2001-2002 Michael David Adams.
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* All rights reserved.
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*/
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/* __START_OF_JASPER_LICENSE__
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*
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* JasPer License Version 2.0
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*
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* Copyright (c) 2001-2006 Michael David Adams
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* Copyright (c) 1999-2000 Image Power, Inc.
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* Copyright (c) 1999-2000 The University of British Columbia
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*
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* All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person (the
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* "User") obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, and/or sell copies of the Software, and to permit
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* persons to whom the Software is furnished to do so, subject to the
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* following conditions:
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*
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* 1. The above copyright notices and this permission notice (which
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* includes the disclaimer below) shall be included in all copies or
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* substantial portions of the Software.
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*
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* 2. The name of a copyright holder shall not be used to endorse or
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* promote products derived from the Software without specific prior
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* written permission.
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*
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* THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS
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* LICENSE. NO USE OF THE SOFTWARE IS AUTHORIZED HEREUNDER EXCEPT UNDER
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* THIS DISCLAIMER. THE SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS
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* "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
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* BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
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* PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. IN NO
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* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL
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* INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING
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* FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
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* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
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* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. NO ASSURANCES ARE
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* PROVIDED BY THE COPYRIGHT HOLDERS THAT THE SOFTWARE DOES NOT INFRINGE
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* THE PATENT OR OTHER INTELLECTUAL PROPERTY RIGHTS OF ANY OTHER ENTITY.
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* EACH COPYRIGHT HOLDER DISCLAIMS ANY LIABILITY TO THE USER FOR CLAIMS
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* BROUGHT BY ANY OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL
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* PROPERTY RIGHTS OR OTHERWISE. AS A CONDITION TO EXERCISING THE RIGHTS
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* GRANTED HEREUNDER, EACH USER HEREBY ASSUMES SOLE RESPONSIBILITY TO SECURE
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* ANY OTHER INTELLECTUAL PROPERTY RIGHTS NEEDED, IF ANY. THE SOFTWARE
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* IS NOT FAULT-TOLERANT AND IS NOT INTENDED FOR USE IN MISSION-CRITICAL
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* SYSTEMS, SUCH AS THOSE USED IN THE OPERATION OF NUCLEAR FACILITIES,
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* AIRCRAFT NAVIGATION OR COMMUNICATION SYSTEMS, AIR TRAFFIC CONTROL
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* SYSTEMS, DIRECT LIFE SUPPORT MACHINES, OR WEAPONS SYSTEMS, IN WHICH
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* THE FAILURE OF THE SOFTWARE OR SYSTEM COULD LEAD DIRECTLY TO DEATH,
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* PERSONAL INJURY, OR SEVERE PHYSICAL OR ENVIRONMENTAL DAMAGE ("HIGH
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* RISK ACTIVITIES"). THE COPYRIGHT HOLDERS SPECIFICALLY DISCLAIM ANY
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* EXPRESS OR IMPLIED WARRANTY OF FITNESS FOR HIGH RISK ACTIVITIES.
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*
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* __END_OF_JASPER_LICENSE__
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*/
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/*
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* Bit Stream Class
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*
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* $Id: jpc_bs.h,v 1.2 2008-05-26 09:40:52 vp153 Exp $
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*/
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#ifndef JPC_BS_H
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#define JPC_BS_H
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/******************************************************************************\
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* Includes.
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\******************************************************************************/
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#include <stdio.h>
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#include "jasper/jas_types.h"
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#include "jasper/jas_stream.h"
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/******************************************************************************\
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* Constants.
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\******************************************************************************/
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/*
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* Bit stream open mode flags.
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*/
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/* Bit stream open for reading. */
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#define JPC_BITSTREAM_READ 0x01
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/* Bit stream open for writing. */
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#define JPC_BITSTREAM_WRITE 0x02
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/*
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* Bit stream flags.
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*/
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/* Do not close underlying character stream. */
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#define JPC_BITSTREAM_NOCLOSE 0x01
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/* End of file has been reached while reading. */
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#define JPC_BITSTREAM_EOF 0x02
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/* An I/O error has occured. */
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#define JPC_BITSTREAM_ERR 0x04
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/******************************************************************************\
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* Types.
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\******************************************************************************/
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/* Bit stream class. */
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typedef struct {
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/* Some miscellaneous flags. */
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int flags_;
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/* The input/output buffer. */
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uint_fast16_t buf_;
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/* The number of bits remaining in the byte being read/written. */
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int cnt_;
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/* The underlying stream associated with this bit stream. */
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jas_stream_t *stream_;
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/* The mode in which this bit stream was opened. */
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int openmode_;
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} jpc_bitstream_t;
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/******************************************************************************\
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* Functions/macros for opening and closing bit streams..
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\******************************************************************************/
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/* Open a stream as a bit stream. */
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jpc_bitstream_t *jpc_bitstream_sopen(jas_stream_t *stream, char *mode);
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/* Close a bit stream. */
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int jpc_bitstream_close(jpc_bitstream_t *bitstream);
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/******************************************************************************\
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* Functions/macros for reading from and writing to bit streams..
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\******************************************************************************/
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/* Read a bit from a bit stream. */
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#if defined(DEBUG)
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#define jpc_bitstream_getbit(bitstream) \
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jpc_bitstream_getbit_func(bitstream)
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#else
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#define jpc_bitstream_getbit(bitstream) \
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jpc_bitstream_getbit_macro(bitstream)
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#endif
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/* Write a bit to a bit stream. */
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#if defined(DEBUG)
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#define jpc_bitstream_putbit(bitstream, v) \
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jpc_bitstream_putbit_func(bitstream, v)
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#else
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#define jpc_bitstream_putbit(bitstream, v) \
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jpc_bitstream_putbit_macro(bitstream, v)
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#endif
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/* Read one or more bits from a bit stream. */
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long jpc_bitstream_getbits(jpc_bitstream_t *bitstream, int n);
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/* Write one or more bits to a bit stream. */
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int jpc_bitstream_putbits(jpc_bitstream_t *bitstream, int n, long v);
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/******************************************************************************\
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* Functions/macros for flushing and aligning bit streams.
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\******************************************************************************/
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/* Align the current position within the bit stream to the next byte
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boundary. */
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int jpc_bitstream_align(jpc_bitstream_t *bitstream);
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/* Align the current position in the bit stream with the next byte boundary,
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ensuring that certain bits consumed in the process match a particular
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pattern. */
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int jpc_bitstream_inalign(jpc_bitstream_t *bitstream, int fillmask,
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int filldata);
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/* Align the current position in the bit stream with the next byte boundary,
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writing bits from the specified pattern (if necessary) in the process. */
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int jpc_bitstream_outalign(jpc_bitstream_t *bitstream, int filldata);
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/* Check if a bit stream needs alignment. */
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int jpc_bitstream_needalign(jpc_bitstream_t *bitstream);
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/* How many additional bytes would be output if the bit stream was aligned? */
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int jpc_bitstream_pending(jpc_bitstream_t *bitstream);
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/******************************************************************************\
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* Functions/macros for querying state information for bit streams.
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\******************************************************************************/
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/* Has EOF been encountered on a bit stream? */
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#define jpc_bitstream_eof(bitstream) \
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((bitstream)->flags_ & JPC_BITSTREAM_EOF)
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/******************************************************************************\
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* Internals.
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\******************************************************************************/
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/* DO NOT DIRECTLY INVOKE ANY OF THE MACROS OR FUNCTIONS BELOW. THEY ARE
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FOR INTERNAL USE ONLY. */
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int jpc_bitstream_getbit_func(jpc_bitstream_t *bitstream);
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int jpc_bitstream_putbit_func(jpc_bitstream_t *bitstream, int v);
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int jpc_bitstream_fillbuf(jpc_bitstream_t *bitstream);
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#define jpc_bitstream_getbit_macro(bitstream) \
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(assert((bitstream)->openmode_ & JPC_BITSTREAM_READ), \
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(--(bitstream)->cnt_ >= 0) ? \
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((int)(((bitstream)->buf_ >> (bitstream)->cnt_) & 1)) : \
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jpc_bitstream_fillbuf(bitstream))
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#define jpc_bitstream_putbit_macro(bitstream, bit) \
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(assert((bitstream)->openmode_ & JPC_BITSTREAM_WRITE), \
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(--(bitstream)->cnt_ < 0) ? \
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((bitstream)->buf_ = ((bitstream)->buf_ << 8) & 0xffff, \
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(bitstream)->cnt_ = ((bitstream)->buf_ == 0xff00) ? 6 : 7, \
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(bitstream)->buf_ |= ((bit) & 1) << (bitstream)->cnt_, \
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(jas_stream_putc((bitstream)->stream_, (bitstream)->buf_ >> 8) == EOF) \
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? (EOF) : ((bit) & 1)) : \
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((bitstream)->buf_ |= ((bit) & 1) << (bitstream)->cnt_, \
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(bit) & 1))
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#endif
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