forked from KolibriOS/kolibrios
594 lines
15 KiB
C
594 lines
15 KiB
C
/*
|
|
* Copyright (c) 2002-2007, Communications and Remote Sensing Laboratory, Universite catholique de Louvain (UCL), Belgium
|
|
* Copyright (c) 2002-2007, Professor Benoit Macq
|
|
* Copyright (c) 2001-2003, David Janssens
|
|
* Copyright (c) 2002-2003, Yannick Verschueren
|
|
* Copyright (c) 2003-2007, Francois-Olivier Devaux and Antonin Descampe
|
|
* Copyright (c) 2005, Herve Drolon, FreeImage Team
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
|
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include "opj_includes.h"
|
|
|
|
/** @defgroup MQC MQC - Implementation of an MQ-Coder */
|
|
/*@{*/
|
|
|
|
/** @name Local static functions */
|
|
/*@{*/
|
|
|
|
/**
|
|
Output a byte, doing bit-stuffing if necessary.
|
|
After a 0xff byte, the next byte must be smaller than 0x90.
|
|
@param mqc MQC handle
|
|
*/
|
|
static void mqc_byteout(opj_mqc_t *mqc);
|
|
/**
|
|
Renormalize mqc->a and mqc->c while encoding, so that mqc->a stays between 0x8000 and 0x10000
|
|
@param mqc MQC handle
|
|
*/
|
|
static void mqc_renorme(opj_mqc_t *mqc);
|
|
/**
|
|
Encode the most probable symbol
|
|
@param mqc MQC handle
|
|
*/
|
|
static void mqc_codemps(opj_mqc_t *mqc);
|
|
/**
|
|
Encode the most least symbol
|
|
@param mqc MQC handle
|
|
*/
|
|
static void mqc_codelps(opj_mqc_t *mqc);
|
|
/**
|
|
Fill mqc->c with 1's for flushing
|
|
@param mqc MQC handle
|
|
*/
|
|
static void mqc_setbits(opj_mqc_t *mqc);
|
|
/**
|
|
FIXME: documentation ???
|
|
@param mqc MQC handle
|
|
@return
|
|
*/
|
|
static INLINE int mqc_mpsexchange(opj_mqc_t *const mqc);
|
|
/**
|
|
FIXME: documentation ???
|
|
@param mqc MQC handle
|
|
@return
|
|
*/
|
|
static INLINE int mqc_lpsexchange(opj_mqc_t *const mqc);
|
|
/**
|
|
Input a byte
|
|
@param mqc MQC handle
|
|
*/
|
|
static INLINE void mqc_bytein(opj_mqc_t *const mqc);
|
|
/**
|
|
Renormalize mqc->a and mqc->c while decoding
|
|
@param mqc MQC handle
|
|
*/
|
|
static INLINE void mqc_renormd(opj_mqc_t *const mqc);
|
|
/*@}*/
|
|
|
|
/*@}*/
|
|
|
|
/* <summary> */
|
|
/* This array defines all the possible states for a context. */
|
|
/* </summary> */
|
|
static opj_mqc_state_t mqc_states[47 * 2] = {
|
|
{0x5601, 0, &mqc_states[2], &mqc_states[3]},
|
|
{0x5601, 1, &mqc_states[3], &mqc_states[2]},
|
|
{0x3401, 0, &mqc_states[4], &mqc_states[12]},
|
|
{0x3401, 1, &mqc_states[5], &mqc_states[13]},
|
|
{0x1801, 0, &mqc_states[6], &mqc_states[18]},
|
|
{0x1801, 1, &mqc_states[7], &mqc_states[19]},
|
|
{0x0ac1, 0, &mqc_states[8], &mqc_states[24]},
|
|
{0x0ac1, 1, &mqc_states[9], &mqc_states[25]},
|
|
{0x0521, 0, &mqc_states[10], &mqc_states[58]},
|
|
{0x0521, 1, &mqc_states[11], &mqc_states[59]},
|
|
{0x0221, 0, &mqc_states[76], &mqc_states[66]},
|
|
{0x0221, 1, &mqc_states[77], &mqc_states[67]},
|
|
{0x5601, 0, &mqc_states[14], &mqc_states[13]},
|
|
{0x5601, 1, &mqc_states[15], &mqc_states[12]},
|
|
{0x5401, 0, &mqc_states[16], &mqc_states[28]},
|
|
{0x5401, 1, &mqc_states[17], &mqc_states[29]},
|
|
{0x4801, 0, &mqc_states[18], &mqc_states[28]},
|
|
{0x4801, 1, &mqc_states[19], &mqc_states[29]},
|
|
{0x3801, 0, &mqc_states[20], &mqc_states[28]},
|
|
{0x3801, 1, &mqc_states[21], &mqc_states[29]},
|
|
{0x3001, 0, &mqc_states[22], &mqc_states[34]},
|
|
{0x3001, 1, &mqc_states[23], &mqc_states[35]},
|
|
{0x2401, 0, &mqc_states[24], &mqc_states[36]},
|
|
{0x2401, 1, &mqc_states[25], &mqc_states[37]},
|
|
{0x1c01, 0, &mqc_states[26], &mqc_states[40]},
|
|
{0x1c01, 1, &mqc_states[27], &mqc_states[41]},
|
|
{0x1601, 0, &mqc_states[58], &mqc_states[42]},
|
|
{0x1601, 1, &mqc_states[59], &mqc_states[43]},
|
|
{0x5601, 0, &mqc_states[30], &mqc_states[29]},
|
|
{0x5601, 1, &mqc_states[31], &mqc_states[28]},
|
|
{0x5401, 0, &mqc_states[32], &mqc_states[28]},
|
|
{0x5401, 1, &mqc_states[33], &mqc_states[29]},
|
|
{0x5101, 0, &mqc_states[34], &mqc_states[30]},
|
|
{0x5101, 1, &mqc_states[35], &mqc_states[31]},
|
|
{0x4801, 0, &mqc_states[36], &mqc_states[32]},
|
|
{0x4801, 1, &mqc_states[37], &mqc_states[33]},
|
|
{0x3801, 0, &mqc_states[38], &mqc_states[34]},
|
|
{0x3801, 1, &mqc_states[39], &mqc_states[35]},
|
|
{0x3401, 0, &mqc_states[40], &mqc_states[36]},
|
|
{0x3401, 1, &mqc_states[41], &mqc_states[37]},
|
|
{0x3001, 0, &mqc_states[42], &mqc_states[38]},
|
|
{0x3001, 1, &mqc_states[43], &mqc_states[39]},
|
|
{0x2801, 0, &mqc_states[44], &mqc_states[38]},
|
|
{0x2801, 1, &mqc_states[45], &mqc_states[39]},
|
|
{0x2401, 0, &mqc_states[46], &mqc_states[40]},
|
|
{0x2401, 1, &mqc_states[47], &mqc_states[41]},
|
|
{0x2201, 0, &mqc_states[48], &mqc_states[42]},
|
|
{0x2201, 1, &mqc_states[49], &mqc_states[43]},
|
|
{0x1c01, 0, &mqc_states[50], &mqc_states[44]},
|
|
{0x1c01, 1, &mqc_states[51], &mqc_states[45]},
|
|
{0x1801, 0, &mqc_states[52], &mqc_states[46]},
|
|
{0x1801, 1, &mqc_states[53], &mqc_states[47]},
|
|
{0x1601, 0, &mqc_states[54], &mqc_states[48]},
|
|
{0x1601, 1, &mqc_states[55], &mqc_states[49]},
|
|
{0x1401, 0, &mqc_states[56], &mqc_states[50]},
|
|
{0x1401, 1, &mqc_states[57], &mqc_states[51]},
|
|
{0x1201, 0, &mqc_states[58], &mqc_states[52]},
|
|
{0x1201, 1, &mqc_states[59], &mqc_states[53]},
|
|
{0x1101, 0, &mqc_states[60], &mqc_states[54]},
|
|
{0x1101, 1, &mqc_states[61], &mqc_states[55]},
|
|
{0x0ac1, 0, &mqc_states[62], &mqc_states[56]},
|
|
{0x0ac1, 1, &mqc_states[63], &mqc_states[57]},
|
|
{0x09c1, 0, &mqc_states[64], &mqc_states[58]},
|
|
{0x09c1, 1, &mqc_states[65], &mqc_states[59]},
|
|
{0x08a1, 0, &mqc_states[66], &mqc_states[60]},
|
|
{0x08a1, 1, &mqc_states[67], &mqc_states[61]},
|
|
{0x0521, 0, &mqc_states[68], &mqc_states[62]},
|
|
{0x0521, 1, &mqc_states[69], &mqc_states[63]},
|
|
{0x0441, 0, &mqc_states[70], &mqc_states[64]},
|
|
{0x0441, 1, &mqc_states[71], &mqc_states[65]},
|
|
{0x02a1, 0, &mqc_states[72], &mqc_states[66]},
|
|
{0x02a1, 1, &mqc_states[73], &mqc_states[67]},
|
|
{0x0221, 0, &mqc_states[74], &mqc_states[68]},
|
|
{0x0221, 1, &mqc_states[75], &mqc_states[69]},
|
|
{0x0141, 0, &mqc_states[76], &mqc_states[70]},
|
|
{0x0141, 1, &mqc_states[77], &mqc_states[71]},
|
|
{0x0111, 0, &mqc_states[78], &mqc_states[72]},
|
|
{0x0111, 1, &mqc_states[79], &mqc_states[73]},
|
|
{0x0085, 0, &mqc_states[80], &mqc_states[74]},
|
|
{0x0085, 1, &mqc_states[81], &mqc_states[75]},
|
|
{0x0049, 0, &mqc_states[82], &mqc_states[76]},
|
|
{0x0049, 1, &mqc_states[83], &mqc_states[77]},
|
|
{0x0025, 0, &mqc_states[84], &mqc_states[78]},
|
|
{0x0025, 1, &mqc_states[85], &mqc_states[79]},
|
|
{0x0015, 0, &mqc_states[86], &mqc_states[80]},
|
|
{0x0015, 1, &mqc_states[87], &mqc_states[81]},
|
|
{0x0009, 0, &mqc_states[88], &mqc_states[82]},
|
|
{0x0009, 1, &mqc_states[89], &mqc_states[83]},
|
|
{0x0005, 0, &mqc_states[90], &mqc_states[84]},
|
|
{0x0005, 1, &mqc_states[91], &mqc_states[85]},
|
|
{0x0001, 0, &mqc_states[90], &mqc_states[86]},
|
|
{0x0001, 1, &mqc_states[91], &mqc_states[87]},
|
|
{0x5601, 0, &mqc_states[92], &mqc_states[92]},
|
|
{0x5601, 1, &mqc_states[93], &mqc_states[93]},
|
|
};
|
|
|
|
/*
|
|
==========================================================
|
|
local functions
|
|
==========================================================
|
|
*/
|
|
|
|
static void mqc_byteout(opj_mqc_t *mqc) {
|
|
if (*mqc->bp == 0xff) {
|
|
mqc->bp++;
|
|
*mqc->bp = mqc->c >> 20;
|
|
mqc->c &= 0xfffff;
|
|
mqc->ct = 7;
|
|
} else {
|
|
if ((mqc->c & 0x8000000) == 0) { /* ((mqc->c&0x8000000)==0) CHANGE */
|
|
mqc->bp++;
|
|
*mqc->bp = mqc->c >> 19;
|
|
mqc->c &= 0x7ffff;
|
|
mqc->ct = 8;
|
|
} else {
|
|
(*mqc->bp)++;
|
|
if (*mqc->bp == 0xff) {
|
|
mqc->c &= 0x7ffffff;
|
|
mqc->bp++;
|
|
*mqc->bp = mqc->c >> 20;
|
|
mqc->c &= 0xfffff;
|
|
mqc->ct = 7;
|
|
} else {
|
|
mqc->bp++;
|
|
*mqc->bp = mqc->c >> 19;
|
|
mqc->c &= 0x7ffff;
|
|
mqc->ct = 8;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static void mqc_renorme(opj_mqc_t *mqc) {
|
|
do {
|
|
mqc->a <<= 1;
|
|
mqc->c <<= 1;
|
|
mqc->ct--;
|
|
if (mqc->ct == 0) {
|
|
mqc_byteout(mqc);
|
|
}
|
|
} while ((mqc->a & 0x8000) == 0);
|
|
}
|
|
|
|
static void mqc_codemps(opj_mqc_t *mqc) {
|
|
mqc->a -= (*mqc->curctx)->qeval;
|
|
if ((mqc->a & 0x8000) == 0) {
|
|
if (mqc->a < (*mqc->curctx)->qeval) {
|
|
mqc->a = (*mqc->curctx)->qeval;
|
|
} else {
|
|
mqc->c += (*mqc->curctx)->qeval;
|
|
}
|
|
*mqc->curctx = (*mqc->curctx)->nmps;
|
|
mqc_renorme(mqc);
|
|
} else {
|
|
mqc->c += (*mqc->curctx)->qeval;
|
|
}
|
|
}
|
|
|
|
static void mqc_codelps(opj_mqc_t *mqc) {
|
|
mqc->a -= (*mqc->curctx)->qeval;
|
|
if (mqc->a < (*mqc->curctx)->qeval) {
|
|
mqc->c += (*mqc->curctx)->qeval;
|
|
} else {
|
|
mqc->a = (*mqc->curctx)->qeval;
|
|
}
|
|
*mqc->curctx = (*mqc->curctx)->nlps;
|
|
mqc_renorme(mqc);
|
|
}
|
|
|
|
static void mqc_setbits(opj_mqc_t *mqc) {
|
|
unsigned int tempc = mqc->c + mqc->a;
|
|
mqc->c |= 0xffff;
|
|
if (mqc->c >= tempc) {
|
|
mqc->c -= 0x8000;
|
|
}
|
|
}
|
|
|
|
static INLINE int mqc_mpsexchange(opj_mqc_t *const mqc) {
|
|
int d;
|
|
if (mqc->a < (*mqc->curctx)->qeval) {
|
|
d = 1 - (*mqc->curctx)->mps;
|
|
*mqc->curctx = (*mqc->curctx)->nlps;
|
|
} else {
|
|
d = (*mqc->curctx)->mps;
|
|
*mqc->curctx = (*mqc->curctx)->nmps;
|
|
}
|
|
|
|
return d;
|
|
}
|
|
|
|
static INLINE int mqc_lpsexchange(opj_mqc_t *const mqc) {
|
|
int d;
|
|
if (mqc->a < (*mqc->curctx)->qeval) {
|
|
mqc->a = (*mqc->curctx)->qeval;
|
|
d = (*mqc->curctx)->mps;
|
|
*mqc->curctx = (*mqc->curctx)->nmps;
|
|
} else {
|
|
mqc->a = (*mqc->curctx)->qeval;
|
|
d = 1 - (*mqc->curctx)->mps;
|
|
*mqc->curctx = (*mqc->curctx)->nlps;
|
|
}
|
|
|
|
return d;
|
|
}
|
|
|
|
#ifdef MQC_PERF_OPT
|
|
static INLINE void mqc_bytein(opj_mqc_t *const mqc) {
|
|
unsigned int i = *((unsigned int *) mqc->bp);
|
|
mqc->c += i & 0xffff00;
|
|
mqc->ct = i & 0x0f;
|
|
mqc->bp += (i >> 2) & 0x04;
|
|
}
|
|
#else
|
|
static void mqc_bytein(opj_mqc_t *const mqc) {
|
|
if (mqc->bp != mqc->end) {
|
|
unsigned int c;
|
|
if (mqc->bp + 1 != mqc->end) {
|
|
c = *(mqc->bp + 1);
|
|
} else {
|
|
c = 0xff;
|
|
}
|
|
if (*mqc->bp == 0xff) {
|
|
if (c > 0x8f) {
|
|
mqc->c += 0xff00;
|
|
mqc->ct = 8;
|
|
} else {
|
|
mqc->bp++;
|
|
mqc->c += c << 9;
|
|
mqc->ct = 7;
|
|
}
|
|
} else {
|
|
mqc->bp++;
|
|
mqc->c += c << 8;
|
|
mqc->ct = 8;
|
|
}
|
|
} else {
|
|
mqc->c += 0xff00;
|
|
mqc->ct = 8;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
static INLINE void mqc_renormd(opj_mqc_t *const mqc) {
|
|
do {
|
|
if (mqc->ct == 0) {
|
|
mqc_bytein(mqc);
|
|
}
|
|
mqc->a <<= 1;
|
|
mqc->c <<= 1;
|
|
mqc->ct--;
|
|
} while (mqc->a < 0x8000);
|
|
}
|
|
|
|
/*
|
|
==========================================================
|
|
MQ-Coder interface
|
|
==========================================================
|
|
*/
|
|
|
|
opj_mqc_t* mqc_create(void) {
|
|
opj_mqc_t *mqc = (opj_mqc_t*)opj_malloc(sizeof(opj_mqc_t));
|
|
#ifdef MQC_PERF_OPT
|
|
mqc->buffer = NULL;
|
|
#endif
|
|
return mqc;
|
|
}
|
|
|
|
void mqc_destroy(opj_mqc_t *mqc) {
|
|
if(mqc) {
|
|
#ifdef MQC_PERF_OPT
|
|
if (mqc->buffer) {
|
|
opj_free(mqc->buffer);
|
|
}
|
|
#endif
|
|
opj_free(mqc);
|
|
}
|
|
}
|
|
|
|
int mqc_numbytes(opj_mqc_t *mqc) {
|
|
return mqc->bp - mqc->start;
|
|
}
|
|
|
|
void mqc_init_enc(opj_mqc_t *mqc, unsigned char *bp) {
|
|
mqc_setcurctx(mqc, 0);
|
|
mqc->a = 0x8000;
|
|
mqc->c = 0;
|
|
mqc->bp = bp - 1;
|
|
mqc->ct = 12;
|
|
if (*mqc->bp == 0xff) {
|
|
mqc->ct = 13;
|
|
}
|
|
mqc->start = bp;
|
|
}
|
|
|
|
void mqc_encode(opj_mqc_t *mqc, int d) {
|
|
if ((*mqc->curctx)->mps == d) {
|
|
mqc_codemps(mqc);
|
|
} else {
|
|
mqc_codelps(mqc);
|
|
}
|
|
}
|
|
|
|
void mqc_flush(opj_mqc_t *mqc) {
|
|
mqc_setbits(mqc);
|
|
mqc->c <<= mqc->ct;
|
|
mqc_byteout(mqc);
|
|
mqc->c <<= mqc->ct;
|
|
mqc_byteout(mqc);
|
|
|
|
if (*mqc->bp != 0xff) {
|
|
mqc->bp++;
|
|
}
|
|
}
|
|
|
|
void mqc_bypass_init_enc(opj_mqc_t *mqc) {
|
|
mqc->c = 0;
|
|
mqc->ct = 8;
|
|
/*if (*mqc->bp == 0xff) {
|
|
mqc->ct = 7;
|
|
} */
|
|
}
|
|
|
|
void mqc_bypass_enc(opj_mqc_t *mqc, int d) {
|
|
mqc->ct--;
|
|
mqc->c = mqc->c + (d << mqc->ct);
|
|
if (mqc->ct == 0) {
|
|
mqc->bp++;
|
|
*mqc->bp = mqc->c;
|
|
mqc->ct = 8;
|
|
if (*mqc->bp == 0xff) {
|
|
mqc->ct = 7;
|
|
}
|
|
mqc->c = 0;
|
|
}
|
|
}
|
|
|
|
int mqc_bypass_flush_enc(opj_mqc_t *mqc) {
|
|
unsigned char bit_padding;
|
|
|
|
bit_padding = 0;
|
|
|
|
if (mqc->ct != 0) {
|
|
while (mqc->ct > 0) {
|
|
mqc->ct--;
|
|
mqc->c += bit_padding << mqc->ct;
|
|
bit_padding = (bit_padding + 1) & 0x01;
|
|
}
|
|
mqc->bp++;
|
|
*mqc->bp = mqc->c;
|
|
mqc->ct = 8;
|
|
mqc->c = 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
void mqc_reset_enc(opj_mqc_t *mqc) {
|
|
mqc_resetstates(mqc);
|
|
mqc_setstate(mqc, T1_CTXNO_UNI, 0, 46);
|
|
mqc_setstate(mqc, T1_CTXNO_AGG, 0, 3);
|
|
mqc_setstate(mqc, T1_CTXNO_ZC, 0, 4);
|
|
}
|
|
|
|
int mqc_restart_enc(opj_mqc_t *mqc) {
|
|
int correction = 1;
|
|
|
|
/* <flush part> */
|
|
int n = 27 - 15 - mqc->ct;
|
|
mqc->c <<= mqc->ct;
|
|
while (n > 0) {
|
|
mqc_byteout(mqc);
|
|
n -= mqc->ct;
|
|
mqc->c <<= mqc->ct;
|
|
}
|
|
mqc_byteout(mqc);
|
|
|
|
return correction;
|
|
}
|
|
|
|
void mqc_restart_init_enc(opj_mqc_t *mqc) {
|
|
/* <Re-init part> */
|
|
mqc_setcurctx(mqc, 0);
|
|
mqc->a = 0x8000;
|
|
mqc->c = 0;
|
|
mqc->ct = 12;
|
|
mqc->bp--;
|
|
if (*mqc->bp == 0xff) {
|
|
mqc->ct = 13;
|
|
}
|
|
}
|
|
|
|
void mqc_erterm_enc(opj_mqc_t *mqc) {
|
|
int k = 11 - mqc->ct + 1;
|
|
|
|
while (k > 0) {
|
|
mqc->c <<= mqc->ct;
|
|
mqc->ct = 0;
|
|
mqc_byteout(mqc);
|
|
k -= mqc->ct;
|
|
}
|
|
|
|
if (*mqc->bp != 0xff) {
|
|
mqc_byteout(mqc);
|
|
}
|
|
}
|
|
|
|
void mqc_segmark_enc(opj_mqc_t *mqc) {
|
|
int i;
|
|
mqc_setcurctx(mqc, 18);
|
|
|
|
for (i = 1; i < 5; i++) {
|
|
mqc_encode(mqc, i % 2);
|
|
}
|
|
}
|
|
|
|
void mqc_init_dec(opj_mqc_t *mqc, unsigned char *bp, int len) {
|
|
mqc_setcurctx(mqc, 0);
|
|
mqc->start = bp;
|
|
mqc->end = bp + len;
|
|
mqc->bp = bp;
|
|
if (len==0) mqc->c = 0xff << 16;
|
|
else mqc->c = *mqc->bp << 16;
|
|
|
|
#ifdef MQC_PERF_OPT
|
|
{
|
|
unsigned int c;
|
|
unsigned int *ip;
|
|
unsigned char *end = mqc->end - 1;
|
|
mqc->buffer = opj_realloc(mqc->buffer, (2 * len + 1) * sizeof(unsigned int));
|
|
ip = (unsigned int *) mqc->buffer;
|
|
|
|
while (bp != end) {
|
|
c = *(bp + 1);
|
|
if (*bp == 0xff) {
|
|
if (c > 0x8f) {
|
|
*ip = 0x0000ff18;
|
|
} else {
|
|
bp++;
|
|
*ip = 0x00000017 | (c << 9);
|
|
}
|
|
} else {
|
|
bp++;
|
|
*ip = 0x00000018 | (c << 8);
|
|
}
|
|
ip++;
|
|
}
|
|
|
|
/* Handle last byte of data */
|
|
c = 0xff;
|
|
if (*bp == 0xff) {
|
|
*ip = 0x0000ff18;
|
|
} else {
|
|
bp++;
|
|
*ip = 0x00000018 | (c << 8);
|
|
}
|
|
ip++;
|
|
|
|
*ip = 0x0000ff08;
|
|
mqc->bp = mqc->buffer;
|
|
}
|
|
#endif
|
|
mqc_bytein(mqc);
|
|
mqc->c <<= 7;
|
|
mqc->ct -= 7;
|
|
mqc->a = 0x8000;
|
|
}
|
|
|
|
int mqc_decode(opj_mqc_t *const mqc) {
|
|
int d;
|
|
mqc->a -= (*mqc->curctx)->qeval;
|
|
if ((mqc->c >> 16) < (*mqc->curctx)->qeval) {
|
|
d = mqc_lpsexchange(mqc);
|
|
mqc_renormd(mqc);
|
|
} else {
|
|
mqc->c -= (*mqc->curctx)->qeval << 16;
|
|
if ((mqc->a & 0x8000) == 0) {
|
|
d = mqc_mpsexchange(mqc);
|
|
mqc_renormd(mqc);
|
|
} else {
|
|
d = (*mqc->curctx)->mps;
|
|
}
|
|
}
|
|
|
|
return d;
|
|
}
|
|
|
|
void mqc_resetstates(opj_mqc_t *mqc) {
|
|
int i;
|
|
for (i = 0; i < MQC_NUMCTXS; i++) {
|
|
mqc->ctxs[i] = mqc_states;
|
|
}
|
|
}
|
|
|
|
void mqc_setstate(opj_mqc_t *mqc, int ctxno, int msb, int prob) {
|
|
mqc->ctxs[ctxno] = &mqc_states[msb + (prob << 1)];
|
|
}
|
|
|
|
|