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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

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 * 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.c,v 1.1 2003/05/15 01:30:32 ace Exp $

 */

/******************************************************************************\

* Includes.

\******************************************************************************/

#include <assert.h>

#include <stdlib.h>

#include <stdarg.h>

#include "jas_types.h"

#include "jas_malloc.h"

#include "jas_math.h"

#include "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;

        }

}

/******************************************************************************\

* Code for debugging.

\******************************************************************************/

/* Dump a MQ decoder to a stream for debugging. */

void jpc_mqdec_dump(jpc_mqdec_t *mqdec, FILE *out)

{

        fprintf(out, "MQDEC A = %08lx, C = %08lx, CT=%08lx, ",

          (unsigned long) mqdec->areg, (unsigned long) mqdec->creg,

          (unsigned long) mqdec->ctreg);

        fprintf(out, "CTX = %d, ", mqdec->curctx - mqdec->ctxs);

        fprintf(out, "IND %d, MPS %d, QEVAL %x\n", *mqdec->curctx -

          jpc_mqstates, (*mqdec->curctx)->mps, (*mqdec->curctx)->qeval);

}