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/*
* Copyright (c) 1999-2000 Image Power, Inc. and the University of
* British Columbia.
* Copyright (c) 2001-2003 Michael David Adams.
* All rights reserved.
*/
/* __START_OF_JASPER_LICENSE__
*
* JasPer Software License
*
* IMAGE POWER JPEG-2000 PUBLIC LICENSE
* ************************************
*
* GRANT:
*
* Permission is hereby granted, free of charge, to any person (the "User")
* obtaining a copy of this software and associated documentation, to deal
* in the JasPer Software without restriction, including without limitation
* the right to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the JasPer Software (in source and binary forms),
* and to permit persons to whom the JasPer Software is furnished to do so,
* provided further that the License Conditions below are met.
*
* License Conditions
* ******************
*
* A. Redistributions of source code must retain the above copyright notice,
* and this list of conditions, and the following disclaimer.
*
* B. Redistributions in binary form must reproduce the above copyright
* notice, and this list of conditions, and the following disclaimer in
* the documentation and/or other materials provided with the distribution.
*
* C. Neither the name of Image Power, Inc. nor any other contributor
* (including, but not limited to, the University of British Columbia and
* Michael David Adams) may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* D. User agrees that it shall not commence any action against Image Power,
* Inc., the University of British Columbia, Michael David Adams, or any
* other contributors (collectively "Licensors") for infringement of any
* intellectual property rights ("IPR") held by the User in respect of any
* technology that User owns or has a right to license or sublicense and
* which is an element required in order to claim compliance with ISO/IEC
* 15444-1 (i.e., JPEG-2000 Part 1). "IPR" means all intellectual property
* rights worldwide arising under statutory or common law, and whether
* or not perfected, including, without limitation, all (i) patents and
* patent applications owned or licensable by User; (ii) rights associated
* with works of authorship including copyrights, copyright applications,
* copyright registrations, mask work rights, mask work applications,
* mask work registrations; (iii) rights relating to the protection of
* trade secrets and confidential information; (iv) any right analogous
* to those set forth in subsections (i), (ii), or (iii) and any other
* proprietary rights relating to intangible property (other than trademark,
* trade dress, or service mark rights); and (v) divisions, continuations,
* renewals, reissues and extensions of the foregoing (as and to the extent
* applicable) now existing, hereafter filed, issued or acquired.
*
* E. If User commences an infringement action against any Licensor(s) then
* such Licensor(s) shall have the right to terminate User's license and
* all sublicenses that have been granted hereunder by User to other parties.
*
* F. This software is for use only in hardware or software products that
* are compliant with ISO/IEC 15444-1 (i.e., JPEG-2000 Part 1). No license
* or right to this Software is granted for products that do not comply
* with ISO/IEC 15444-1. The JPEG-2000 Part 1 standard can be purchased
* from the ISO.
*
* THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS LICENSE.
* NO USE OF THE JASPER SOFTWARE IS AUTHORIZED HEREUNDER EXCEPT UNDER
* THIS DISCLAIMER. THE JASPER SOFTWARE IS PROVIDED BY THE LICENSORS AND
* CONTRIBUTORS UNDER THIS LICENSE ON AN ``AS-IS'' BASIS, WITHOUT WARRANTY
* OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION,
* WARRANTIES THAT THE JASPER SOFTWARE IS FREE OF DEFECTS, IS MERCHANTABLE,
* IS FIT FOR A PARTICULAR PURPOSE OR IS NON-INFRINGING. THOSE INTENDING
* TO USE THE JASPER SOFTWARE OR MODIFICATIONS THEREOF FOR USE IN HARDWARE
* OR SOFTWARE PRODUCTS ARE ADVISED THAT THEIR USE MAY INFRINGE EXISTING
* PATENTS, COPYRIGHTS, TRADEMARKS, OR OTHER INTELLECTUAL PROPERTY RIGHTS.
* THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE JASPER SOFTWARE
* IS WITH THE USER. SHOULD ANY PART OF THE JASPER SOFTWARE PROVE DEFECTIVE
* IN ANY RESPECT, THE USER (AND NOT THE INITIAL DEVELOPERS, THE UNIVERSITY
* OF BRITISH COLUMBIA, IMAGE POWER, INC., MICHAEL DAVID ADAMS, OR ANY
* OTHER CONTRIBUTOR) SHALL ASSUME THE COST OF ANY NECESSARY SERVICING,
* REPAIR OR CORRECTION. UNDER NO CIRCUMSTANCES AND UNDER NO LEGAL THEORY,
* WHETHER TORT (INCLUDING NEGLIGENCE), CONTRACT, OR OTHERWISE, SHALL THE
* INITIAL DEVELOPER, THE UNIVERSITY OF BRITISH COLUMBIA, IMAGE POWER, INC.,
* MICHAEL DAVID ADAMS, ANY OTHER CONTRIBUTOR, OR ANY DISTRIBUTOR OF THE
* JASPER SOFTWARE, OR ANY SUPPLIER OF ANY OF SUCH PARTIES, BE LIABLE TO
* THE USER OR ANY OTHER PERSON FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR
* CONSEQUENTIAL DAMAGES OF ANY CHARACTER INCLUDING, WITHOUT LIMITATION,
* DAMAGES FOR LOSS OF GOODWILL, WORK STOPPAGE, COMPUTER FAILURE OR
* MALFUNCTION, OR ANY AND ALL OTHER COMMERCIAL DAMAGES OR LOSSES, EVEN IF
* SUCH PARTY HAD BEEN INFORMED, OR OUGHT TO HAVE KNOWN, OF THE POSSIBILITY
* OF SUCH DAMAGES. THE JASPER SOFTWARE AND UNDERLYING TECHNOLOGY ARE NOT
* FAULT-TOLERANT AND ARE NOT DESIGNED, MANUFACTURED OR INTENDED FOR USE OR
* RESALE AS ON-LINE CONTROL EQUIPMENT IN HAZARDOUS ENVIRONMENTS REQUIRING
* FAIL-SAFE PERFORMANCE, SUCH AS IN THE OPERATION OF NUCLEAR FACILITIES,
* AIRCRAFT NAVIGATION OR COMMUNICATION SYSTEMS, AIR TRAFFIC CONTROL, DIRECT
* LIFE SUPPORT MACHINES, OR WEAPONS SYSTEMS, IN WHICH THE FAILURE OF THE
* JASPER SOFTWARE OR UNDERLYING TECHNOLOGY OR PRODUCT COULD LEAD DIRECTLY
* TO DEATH, PERSONAL INJURY, OR SEVERE PHYSICAL OR ENVIRONMENTAL DAMAGE
* ("HIGH RISK ACTIVITIES"). LICENSOR SPECIFICALLY DISCLAIMS ANY EXPRESS
* OR IMPLIED WARRANTY OF FITNESS FOR HIGH RISK ACTIVITIES. USER WILL NOT
* KNOWINGLY USE, DISTRIBUTE OR RESELL THE JASPER SOFTWARE OR UNDERLYING
* TECHNOLOGY OR PRODUCTS FOR HIGH RISK ACTIVITIES AND WILL ENSURE THAT ITS
* CUSTOMERS AND END-USERS OF ITS PRODUCTS ARE PROVIDED WITH A COPY OF THE
* NOTICE SPECIFIED IN THIS SECTION.
*
* __END_OF_JASPER_LICENSE__
*/
/*
* MQ Arithmetic Decoder
*
* $Id: jpc_mqdec.h,v 1.1 2003/05/15 01:30:32 ace Exp $
*/
#ifndef JPC_MQDEC_H
#define JPC_MQDEC_H
/******************************************************************************\
* Includes.
\******************************************************************************/
#include "jas_types.h"
#include "jas_stream.h"
#include "jpc_mqcod.h"
/******************************************************************************\
* Types.
\******************************************************************************/
/* MQ arithmetic decoder. */
typedef struct {
/* The C register. */
uint_fast32_t creg;
/* The A register. */
uint_fast32_t areg;
/* The CT register. */
uint_fast32_t ctreg;
/* The current context. */
jpc_mqstate_t **curctx;
/* The per-context information. */
jpc_mqstate_t **ctxs;
/* The maximum number of contexts. */
int maxctxs;
/* The stream from which to read data. */
jas_stream_t *in;
/* The last character read. */
uchar inbuffer;
/* The EOF indicator. */
int eof;
} jpc_mqdec_t;
/******************************************************************************\
* Functions/macros for construction and destruction.
\******************************************************************************/
/* Create a MQ decoder. */
jpc_mqdec_t *jpc_mqdec_create(int maxctxs, jas_stream_t *in);
/* Destroy a MQ decoder. */
void jpc_mqdec_destroy(jpc_mqdec_t *dec);
/******************************************************************************\
* Functions/macros for initialization.
\******************************************************************************/
/* Set the input stream associated with a MQ decoder. */
void jpc_mqdec_setinput(jpc_mqdec_t *dec, jas_stream_t *in);
/* Initialize a MQ decoder. */
void jpc_mqdec_init(jpc_mqdec_t *dec);
/******************************************************************************\
* Functions/macros for manipulating contexts.
\******************************************************************************/
/* Set the current context for a MQ decoder. */
#define jpc_mqdec_setcurctx(dec, ctxno) \
((mqdec)->curctx = &(mqdec)->ctxs[ctxno]);
/* Set the state information for a particular context of a MQ decoder. */
void jpc_mqdec_setctx(jpc_mqdec_t *dec, int ctxno, jpc_mqctx_t *ctx);
/* Set the state information for all contexts of a MQ decoder. */
void jpc_mqdec_setctxs(jpc_mqdec_t *dec, int numctxs, jpc_mqctx_t *ctxs);
/******************************************************************************\
* Functions/macros for decoding bits.
\******************************************************************************/
/* Decode a symbol. */
#if !defined(DEBUG)
#define jpc_mqdec_getbit(dec) \
jpc_mqdec_getbit_macro(dec)
#else
#define jpc_mqdec_getbit(dec) \
jpc_mqdec_getbit_func(dec)
#endif
/* Decode a symbol (assuming an unskewed probability distribution). */
#if !defined(DEBUG)
#define jpc_mqdec_getbitnoskew(dec) \
jpc_mqdec_getbit_macro(dec)
#else
#define jpc_mqdec_getbitnoskew(dec) \
jpc_mqdec_getbit_func(dec)
#endif
/******************************************************************************\
* Functions/macros for debugging.
\******************************************************************************/
/* Dump the MQ decoder state for debugging. */
void jpc_mqdec_dump(jpc_mqdec_t *dec, FILE *out);
/******************************************************************************\
* EVERYTHING BELOW THIS POINT IS IMPLEMENTATION SPECIFIC AND NOT PART OF THE
* APPLICATION INTERFACE. DO NOT RELY ON ANY OF THE INTERNAL FUNCTIONS/MACROS
* GIVEN BELOW.
\******************************************************************************/
#define jpc_mqdec_getbit_macro(dec) \
((((dec)->areg -= (*(dec)->curctx)->qeval), \
(dec)->creg >> 16 >= (*(dec)->curctx)->qeval) ? \
((((dec)->creg -= (*(dec)->curctx)->qeval << 16), \
(dec)->areg & 0x8000) ? (*(dec)->curctx)->mps : \
jpc_mqdec_mpsexchrenormd(dec)) : \
jpc_mqdec_lpsexchrenormd(dec))
#define jpc_mqdec_mpsexchange(areg, delta, curctx, bit) \
{ \
if ((areg) < (delta)) { \
register jpc_mqstate_t *state = *(curctx); \
/* LPS decoded. */ \
(bit) = state->mps ^ 1; \
*(curctx) = state->nlps; \
} else { \
register jpc_mqstate_t *state = *(curctx); \
/* MPS decoded. */ \
(bit) = state->mps; \
*(curctx) = state->nmps; \
} \
}
#define jpc_mqdec_lpsexchange(areg, delta, curctx, bit) \
{ \
if ((areg) >= (delta)) { \
register jpc_mqstate_t *state = *(curctx); \
(areg) = (delta); \
(bit) = state->mps ^ 1; \
*(curctx) = state->nlps; \
} else { \
register jpc_mqstate_t *state = *(curctx); \
(areg) = (delta); \
(bit) = state->mps; \
*(curctx) = state->nmps; \
} \
}
#define jpc_mqdec_renormd(areg, creg, ctreg, in, eof, inbuf) \
{ \
do { \
if (!(ctreg)) { \
jpc_mqdec_bytein2(creg, ctreg, in, eof, inbuf); \
} \
(areg) <<= 1; \
(creg) <<= 1; \
--(ctreg); \
} while (!((areg) & 0x8000)); \
}
#define jpc_mqdec_bytein2(creg, ctreg, in, eof, inbuf) \
{ \
int c; \
unsigned char prevbuf; \
if (!(eof)) { \
if ((c = jas_stream_getc(in)) == EOF) { \
(eof) = 1; \
c = 0xff; \
} \
prevbuf = (inbuf); \
(inbuf) = c; \
if (prevbuf == 0xff) { \
if (c > 0x8f) { \
(creg) += 0xff00; \
(ctreg) = 8; \
} else { \
(creg) += c << 9; \
(ctreg) = 7; \
} \
} else { \
(creg) += c << 8; \
(ctreg) = 8; \
} \
} else { \
(creg) += 0xff00; \
(ctreg) = 8; \
} \
}
int jpc_mqdec_getbit_func(jpc_mqdec_t *dec);
int jpc_mqdec_mpsexchrenormd(jpc_mqdec_t *dec);
int jpc_mqdec_lpsexchrenormd(jpc_mqdec_t *dec);
#endif