/* * Copyright (c) 1999-2000 Image Power, Inc. and the University of * British Columbia. * Copyright (c) 2001-2002 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 * * $Id$ */ /******************************************************************************\ * Includes. \******************************************************************************/ #include #include #include #include "jasper/jas_types.h" #include "jasper/jas_malloc.h" #include "jasper/jas_math.h" #include "jasper/jas_debug.h" #include "jpc_mqdec.h" /******************************************************************************\ * Local macros. \******************************************************************************/ #if defined(DEBUG) #define MQDEC_CALL(n, x) \ ((jas_getdbglevel() >= (n)) ? ((void)(x)) : ((void)0)) #else #define MQDEC_CALL(n, x) #endif /******************************************************************************\ * Local function prototypes. \******************************************************************************/ static void jpc_mqdec_bytein(jpc_mqdec_t *mqdec); /******************************************************************************\ * Code for creation and destruction of a MQ decoder. \******************************************************************************/ /* Create a MQ decoder. */ jpc_mqdec_t *jpc_mqdec_create(int maxctxs, jas_stream_t *in) { jpc_mqdec_t *mqdec; /* There must be at least one context. */ assert(maxctxs > 0); /* Allocate memory for the MQ decoder. */ if (!(mqdec = jas_malloc(sizeof(jpc_mqdec_t)))) { goto error; } mqdec->in = in; mqdec->maxctxs = maxctxs; /* Allocate memory for the per-context state information. */ if (!(mqdec->ctxs = jas_malloc(mqdec->maxctxs * sizeof(jpc_mqstate_t *)))) { goto error; } /* Set the current context to the first context. */ mqdec->curctx = mqdec->ctxs; /* If an input stream has been associated with the MQ decoder, initialize the decoder state from the stream. */ if (mqdec->in) { jpc_mqdec_init(mqdec); } /* Initialize the per-context state information. */ jpc_mqdec_setctxs(mqdec, 0, 0); return mqdec; error: /* Oops... Something has gone wrong. */ if (mqdec) { jpc_mqdec_destroy(mqdec); } return 0; } /* Destroy a MQ decoder. */ void jpc_mqdec_destroy(jpc_mqdec_t *mqdec) { if (mqdec->ctxs) { jas_free(mqdec->ctxs); } jas_free(mqdec); } /******************************************************************************\ * Code for initialization of a MQ decoder. \******************************************************************************/ /* Initialize the state of a MQ decoder. */ void jpc_mqdec_init(jpc_mqdec_t *mqdec) { int c; mqdec->eof = 0; mqdec->creg = 0; /* Get the next byte from the input stream. */ if ((c = jas_stream_getc(mqdec->in)) == EOF) { /* We have encountered an I/O error or EOF. */ c = 0xff; mqdec->eof = 1; } mqdec->inbuffer = c; mqdec->creg += mqdec->inbuffer << 16; jpc_mqdec_bytein(mqdec); mqdec->creg <<= 7; mqdec->ctreg -= 7; mqdec->areg = 0x8000; } /* Set the input stream for a MQ decoder. */ void jpc_mqdec_setinput(jpc_mqdec_t *mqdec, jas_stream_t *in) { mqdec->in = in; } /* Initialize one or more contexts. */ void jpc_mqdec_setctxs(jpc_mqdec_t *mqdec, int numctxs, jpc_mqctx_t *ctxs) { jpc_mqstate_t **ctx; int n; ctx = mqdec->ctxs; n = JAS_MIN(mqdec->maxctxs, numctxs); while (--n >= 0) { *ctx = &jpc_mqstates[2 * ctxs->ind + ctxs->mps]; ++ctx; ++ctxs; } n = mqdec->maxctxs - numctxs; while (--n >= 0) { *ctx = &jpc_mqstates[0]; ++ctx; } } /* Initialize a context. */ void jpc_mqdec_setctx(jpc_mqdec_t *mqdec, int ctxno, jpc_mqctx_t *ctx) { jpc_mqstate_t **ctxi; ctxi = &mqdec->ctxs[ctxno]; *ctxi = &jpc_mqstates[2 * ctx->ind + ctx->mps]; } /******************************************************************************\ * Code for decoding a bit. \******************************************************************************/ /* Decode a bit. */ int jpc_mqdec_getbit_func(register jpc_mqdec_t *mqdec) { int bit; JAS_DBGLOG(100, ("jpc_mqdec_getbit_func(%p)\n", mqdec)); MQDEC_CALL(100, jpc_mqdec_dump(mqdec, stderr)); bit = jpc_mqdec_getbit_macro(mqdec); MQDEC_CALL(100, jpc_mqdec_dump(mqdec, stderr)); JAS_DBGLOG(100, ("ctx = %d, decoded %d\n", mqdec->curctx - mqdec->ctxs, bit)); return bit; } /* Apply MPS_EXCHANGE algorithm (with RENORMD). */ int jpc_mqdec_mpsexchrenormd(register jpc_mqdec_t *mqdec) { int ret; register jpc_mqstate_t *state = *mqdec->curctx; jpc_mqdec_mpsexchange(mqdec->areg, state->qeval, mqdec->curctx, ret); jpc_mqdec_renormd(mqdec->areg, mqdec->creg, mqdec->ctreg, mqdec->in, mqdec->eof, mqdec->inbuffer); return ret; } /* Apply LPS_EXCHANGE algorithm (with RENORMD). */ int jpc_mqdec_lpsexchrenormd(register jpc_mqdec_t *mqdec) { int ret; register jpc_mqstate_t *state = *mqdec->curctx; jpc_mqdec_lpsexchange(mqdec->areg, state->qeval, mqdec->curctx, ret); jpc_mqdec_renormd(mqdec->areg, mqdec->creg, mqdec->ctreg, mqdec->in, mqdec->eof, mqdec->inbuffer); return ret; } /******************************************************************************\ * Support code. \******************************************************************************/ /* Apply the BYTEIN algorithm. */ static void jpc_mqdec_bytein(jpc_mqdec_t *mqdec) { int c; unsigned char prevbuf; if (!mqdec->eof) { if ((c = jas_stream_getc(mqdec->in)) == EOF) { mqdec->eof = 1; c = 0xff; } prevbuf = mqdec->inbuffer; mqdec->inbuffer = c; if (prevbuf == 0xff) { if (c > 0x8f) { mqdec->creg += 0xff00; mqdec->ctreg = 8; } else { mqdec->creg += c << 9; mqdec->ctreg = 7; } } else { mqdec->creg += c << 8; mqdec->ctreg = 8; } } else { mqdec->creg += 0xff00; mqdec->ctreg = 8; } }