0,0 → 1,187 |
/* |
* 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 BIO BIO - Individual bit input-output stream */ |
/*@{*/ |
|
/** @name Local static functions */ |
/*@{*/ |
|
/** |
Write a bit |
@param bio BIO handle |
@param b Bit to write (0 or 1) |
*/ |
static void bio_putbit(opj_bio_t *bio, int b); |
/** |
Read a bit |
@param bio BIO handle |
@return Returns the read bit |
*/ |
static int bio_getbit(opj_bio_t *bio); |
/** |
Write a byte |
@param bio BIO handle |
@return Returns 0 if successful, returns 1 otherwise |
*/ |
static int bio_byteout(opj_bio_t *bio); |
/** |
Read a byte |
@param bio BIO handle |
@return Returns 0 if successful, returns 1 otherwise |
*/ |
static int bio_bytein(opj_bio_t *bio); |
|
/*@}*/ |
|
/*@}*/ |
|
/* |
========================================================== |
local functions |
========================================================== |
*/ |
|
static int bio_byteout(opj_bio_t *bio) { |
bio->buf = (bio->buf << 8) & 0xffff; |
bio->ct = bio->buf == 0xff00 ? 7 : 8; |
if (bio->bp >= bio->end) { |
return 1; |
} |
*bio->bp++ = bio->buf >> 8; |
return 0; |
} |
|
static int bio_bytein(opj_bio_t *bio) { |
bio->buf = (bio->buf << 8) & 0xffff; |
bio->ct = bio->buf == 0xff00 ? 7 : 8; |
if (bio->bp >= bio->end) { |
return 1; |
} |
bio->buf |= *bio->bp++; |
return 0; |
} |
|
static void bio_putbit(opj_bio_t *bio, int b) { |
if (bio->ct == 0) { |
bio_byteout(bio); |
} |
bio->ct--; |
bio->buf |= b << bio->ct; |
} |
|
static int bio_getbit(opj_bio_t *bio) { |
if (bio->ct == 0) { |
bio_bytein(bio); |
} |
bio->ct--; |
return (bio->buf >> bio->ct) & 1; |
} |
|
/* |
========================================================== |
Bit Input/Output interface |
========================================================== |
*/ |
|
opj_bio_t* bio_create(void) { |
opj_bio_t *bio = (opj_bio_t*)opj_malloc(sizeof(opj_bio_t)); |
return bio; |
} |
|
void bio_destroy(opj_bio_t *bio) { |
if(bio) { |
opj_free(bio); |
} |
} |
|
int bio_numbytes(opj_bio_t *bio) { |
return (bio->bp - bio->start); |
} |
|
void bio_init_enc(opj_bio_t *bio, unsigned char *bp, int len) { |
bio->start = bp; |
bio->end = bp + len; |
bio->bp = bp; |
bio->buf = 0; |
bio->ct = 8; |
} |
|
void bio_init_dec(opj_bio_t *bio, unsigned char *bp, int len) { |
bio->start = bp; |
bio->end = bp + len; |
bio->bp = bp; |
bio->buf = 0; |
bio->ct = 0; |
} |
|
void bio_write(opj_bio_t *bio, int v, int n) { |
int i; |
for (i = n - 1; i >= 0; i--) { |
bio_putbit(bio, (v >> i) & 1); |
} |
} |
|
int bio_read(opj_bio_t *bio, int n) { |
int i, v; |
v = 0; |
for (i = n - 1; i >= 0; i--) { |
v += bio_getbit(bio) << i; |
} |
return v; |
} |
|
int bio_flush(opj_bio_t *bio) { |
bio->ct = 0; |
if (bio_byteout(bio)) { |
return 1; |
} |
if (bio->ct == 7) { |
bio->ct = 0; |
if (bio_byteout(bio)) { |
return 1; |
} |
} |
return 0; |
} |
|
int bio_inalign(opj_bio_t *bio) { |
bio->ct = 0; |
if ((bio->buf & 0xff) == 0xff) { |
if (bio_bytein(bio)) { |
return 1; |
} |
bio->ct = 0; |
} |
return 0; |
} |
Property changes: |
Added: svn:executable |
+* |
\ No newline at end of property |