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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

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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 Encoder

 *

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

 */

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

* Includes.

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

#include <assert.h>

#include <stdlib.h>

#include "jas_stream.h"

#include "jas_malloc.h"

#include "jas_math.h"

#include "jas_debug.h"

#include "jpc_mqenc.h"

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

* Macros

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

#if defined(DEBUG)

#define JPC_MQENC_CALL(n, x) \

        ((jas_getdbglevel() >= (n)) ? ((void)(x)) : ((void)0))

#else

#define JPC_MQENC_CALL(n, x)

#endif

#define jpc_mqenc_codemps9(areg, creg, ctreg, curctx, enc) \

{ \

        jpc_mqstate_t *state = *(curctx); \

        (areg) -= state->qeval; \

        if (!((areg) & 0x8000)) { \

                if ((areg) < state->qeval) { \

                        (areg) = state->qeval; \

                } else { \

                        (creg) += state->qeval; \

                } \

                *(curctx) = state->nmps; \

                jpc_mqenc_renorme((areg), (creg), (ctreg), (enc)); \

        } else { \

                (creg) += state->qeval; \

        } \

}

#define jpc_mqenc_codelps2(areg, creg, ctreg, curctx, enc) \

{ \

        jpc_mqstate_t *state = *(curctx); \

        (areg) -= state->qeval; \

        if ((areg) < state->qeval) { \

                (creg) += state->qeval; \

        } else { \

                (areg) = state->qeval; \

        } \

        *(curctx) = state->nlps; \

        jpc_mqenc_renorme((areg), (creg), (ctreg), (enc)); \

}

#define jpc_mqenc_renorme(areg, creg, ctreg, enc) \

{ \

        do { \

                (areg) <<= 1; \

                (creg) <<= 1; \

                if (!--(ctreg)) { \

                        jpc_mqenc_byteout((areg), (creg), (ctreg), (enc)); \

                } \

        } while (!((areg) & 0x8000)); \

}

#define jpc_mqenc_byteout(areg, creg, ctreg, enc) \

{ \

        if ((enc)->outbuf != 0xff) { \

                if ((creg) & 0x8000000) { \

                        if (++((enc)->outbuf) == 0xff) { \

                                (creg) &= 0x7ffffff; \

                                jpc_mqenc_byteout2(enc); \

                                enc->outbuf = ((creg) >> 20) & 0xff; \

                                (creg) &= 0xfffff; \

                                (ctreg) = 7; \

                        } else { \

                                jpc_mqenc_byteout2(enc); \

                                enc->outbuf = ((creg) >> 19) & 0xff; \

                                (creg) &= 0x7ffff; \

                                (ctreg) = 8; \

                        } \

                } else { \

                        jpc_mqenc_byteout2(enc); \

                        (enc)->outbuf = ((creg) >> 19) & 0xff; \

                        (creg) &= 0x7ffff; \

                        (ctreg) = 8; \

                } \

        } else { \

                jpc_mqenc_byteout2(enc); \

                (enc)->outbuf = ((creg) >> 20) & 0xff; \

                (creg) &= 0xfffff; \

                (ctreg) = 7; \

        } \

}

#define jpc_mqenc_byteout2(enc) \

{ \

        if (enc->outbuf >= 0) { \

                if (jas_stream_putc(enc->out, (unsigned char)enc->outbuf) == EOF) { \

                        enc->err |= 1; \

                } \

        } \

        enc->lastbyte = enc->outbuf; \

}

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

* Local function protoypes.

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

static void jpc_mqenc_setbits(jpc_mqenc_t *mqenc);

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

* Code for creation and destruction of encoder.

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

/* Create a MQ encoder. */

jpc_mqenc_t *jpc_mqenc_create(int maxctxs, jas_stream_t *out)

{

        jpc_mqenc_t *mqenc;

        /* Allocate memory for the MQ encoder. */

        if (!(mqenc = jas_malloc(sizeof(jpc_mqenc_t)))) {

                goto error;

        }

        mqenc->out = out;

        mqenc->maxctxs = maxctxs;

        /* Allocate memory for the per-context state information. */

        if (!(mqenc->ctxs = jas_malloc(mqenc->maxctxs * sizeof(jpc_mqstate_t *)))) {

                goto error;

        }

        /* Set the current context to the first one. */

        mqenc->curctx = mqenc->ctxs;

        jpc_mqenc_init(mqenc);

        /* Initialize the per-context state information to something sane. */

        jpc_mqenc_setctxs(mqenc, 0, 0);

        return mqenc;

error:

        if (mqenc) {

                jpc_mqenc_destroy(mqenc);

        }

        return 0;

}

/* Destroy a MQ encoder. */

void jpc_mqenc_destroy(jpc_mqenc_t *mqenc)

{

        if (mqenc->ctxs) {

                jas_free(mqenc->ctxs);

        }

        jas_free(mqenc);

}

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

* State initialization code.

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

/* Initialize the coding state of a MQ encoder. */

void jpc_mqenc_init(jpc_mqenc_t *mqenc)

{

        mqenc->areg = 0x8000;

        mqenc->outbuf = -1;

        mqenc->creg = 0;

        mqenc->ctreg = 12;

        mqenc->lastbyte = -1;

        mqenc->err = 0;

}

/* Initialize one or more contexts. */

void jpc_mqenc_setctxs(jpc_mqenc_t *mqenc, int numctxs, jpc_mqctx_t *ctxs)

{

        jpc_mqstate_t **ctx;

        int n;

        ctx = mqenc->ctxs;

        n = JAS_MIN(mqenc->maxctxs, numctxs);

        while (--n >= 0) {

                *ctx = &jpc_mqstates[2 * ctxs->ind + ctxs->mps];

                ++ctx;

                ++ctxs;

        }

        n = mqenc->maxctxs - numctxs;

        while (--n >= 0) {

                *ctx = &jpc_mqstates[0];

                ++ctx;

        }

}

/* Get the coding state for a MQ encoder. */

void jpc_mqenc_getstate(jpc_mqenc_t *mqenc, jpc_mqencstate_t *state)

{

        state->areg = mqenc->areg;

        state->creg = mqenc->creg;

        state->ctreg = mqenc->ctreg;

        state->lastbyte = mqenc->lastbyte;

}

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

* Code for coding symbols.

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

/* Encode a bit. */

int jpc_mqenc_putbit_func(jpc_mqenc_t *mqenc, int bit)

{

        const jpc_mqstate_t *state;

        JAS_DBGLOG(100, ("jpc_mqenc_putbit(%p, %d)\n", mqenc, bit));

        JPC_MQENC_CALL(100, jpc_mqenc_dump(mqenc, stderr));

        state = *(mqenc->curctx);

        if (state->mps == bit) {

                /* Apply the CODEMPS algorithm as defined in the standard. */

                mqenc->areg -= state->qeval;

                if (!(mqenc->areg & 0x8000)) {

                        jpc_mqenc_codemps2(mqenc);

                } else {

                        mqenc->creg += state->qeval;

                }

        } else {

                /* Apply the CODELPS algorithm as defined in the standard. */

                jpc_mqenc_codelps2(mqenc->areg, mqenc->creg, mqenc->ctreg, mqenc->curctx, mqenc);

        }

        return jpc_mqenc_error(mqenc) ? (-1) : 0;

}

int jpc_mqenc_codemps2(jpc_mqenc_t *mqenc)

{

        /* Note: This function only performs part of the work associated with

        the CODEMPS algorithm from the standard.  Some of the work is also

        performed by the caller. */

        jpc_mqstate_t *state = *(mqenc->curctx);

        if (mqenc->areg < state->qeval) {

                mqenc->areg = state->qeval;

        } else {

                mqenc->creg += state->qeval;

        }

        *mqenc->curctx = state->nmps;

        jpc_mqenc_renorme(mqenc->areg, mqenc->creg, mqenc->ctreg, mqenc);

        return jpc_mqenc_error(mqenc) ? (-1) : 0;

}

int jpc_mqenc_codelps(jpc_mqenc_t *mqenc)

{

        jpc_mqenc_codelps2(mqenc->areg, mqenc->creg, mqenc->ctreg, mqenc->curctx, mqenc);

        return jpc_mqenc_error(mqenc) ? (-1) : 0;

}

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

* Miscellaneous code.

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

/* Terminate the code word. */

int jpc_mqenc_flush(jpc_mqenc_t *mqenc, int termmode)

{

        int_fast16_t k;

        switch (termmode) {

        case JPC_MQENC_PTERM:

                k = 11 - mqenc->ctreg + 1;

                while (k > 0) {

                        mqenc->creg <<= mqenc->ctreg;

                        mqenc->ctreg = 0;

                        jpc_mqenc_byteout(mqenc->areg, mqenc->creg, mqenc->ctreg,

                          mqenc);

                        k -= mqenc->ctreg;

                }

                if (mqenc->outbuf != 0xff) {

                        jpc_mqenc_byteout(mqenc->areg, mqenc->creg, mqenc->ctreg, mqenc);

                }

                break;

        case JPC_MQENC_DEFTERM:

                jpc_mqenc_setbits(mqenc);

                mqenc->creg <<= mqenc->ctreg;

                jpc_mqenc_byteout(mqenc->areg, mqenc->creg, mqenc->ctreg, mqenc);

                mqenc->creg <<= mqenc->ctreg;

                jpc_mqenc_byteout(mqenc->areg, mqenc->creg, mqenc->ctreg, mqenc);

                if (mqenc->outbuf != 0xff) {

                        jpc_mqenc_byteout(mqenc->areg, mqenc->creg, mqenc->ctreg, mqenc);

                }

                break;

        default:

                abort();

                break;

        }

        return 0;

}

static void jpc_mqenc_setbits(jpc_mqenc_t *mqenc)

{

        uint_fast32_t tmp = mqenc->creg + mqenc->areg;

        mqenc->creg |= 0xffff;

        if (mqenc->creg >= tmp) {

                mqenc->creg -= 0x8000;

        }

}

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

int jpc_mqenc_dump(jpc_mqenc_t *mqenc, FILE *out)

{

        fprintf(out, "AREG = %08x, CREG = %08x, CTREG = %d\n",

          mqenc->areg, mqenc->creg, mqenc->ctreg);

        fprintf(out, "IND = %02d, MPS = %d, QEVAL = %04x\n",

          *mqenc->curctx - jpc_mqstates, (*mqenc->curctx)->mps,

          (*mqenc->curctx)->qeval);

        return 0;

}