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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

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 *

 * 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

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 * 15444-1 (i.e., JPEG-2000 Part 1).  "IPR" means all intellectual property

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 * applicable) now existing, hereafter filed, issued or acquired.

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 * 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.

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 * 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

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 * RESALE AS ON-LINE CONTROL EQUIPMENT IN HAZARDOUS ENVIRONMENTS REQUIRING

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 * 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