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Open Source Computer Vision Library
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231 lines
8.5 KiB
231 lines
8.5 KiB
/* |
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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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