183 lines
4.1 KiB
C
183 lines
4.1 KiB
C
/*
|
|
* Copyright (c) 2001-2002, David Janssens
|
|
* Copyright (c) 2003, Yannick Verschueren
|
|
* Copyright (c) 2003, Communications and remote sensing Laboratory, Universite catholique de Louvain, Belgium
|
|
*
|
|
* 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 "bio.h"
|
|
#include <stdio.h>
|
|
#include <setjmp.h>
|
|
|
|
static unsigned char *bio_start, *bio_end, *bio_bp;
|
|
static unsigned int bio_buf;
|
|
static int bio_ct;
|
|
|
|
extern jmp_buf j2k_error;
|
|
|
|
/* <summary> */
|
|
/* Number of bytes written. */
|
|
/* </summary> */
|
|
int bio_numbytes()
|
|
{
|
|
return bio_bp - bio_start;
|
|
}
|
|
|
|
/* <summary> */
|
|
/* Init encoder. */
|
|
/* </summary> */
|
|
/* <param name="bp">Output buffer</param> */
|
|
/* <param name="len">Output buffer length</param> */
|
|
void bio_init_enc(unsigned char *bp, int len)
|
|
{
|
|
bio_start = bp;
|
|
bio_end = bp + len;
|
|
bio_bp = bp;
|
|
bio_buf = 0;
|
|
bio_ct = 8;
|
|
}
|
|
|
|
/* <summary> */
|
|
/* Init decoder. */
|
|
/* </summary> */
|
|
/* <param name="bp">Input buffer</param> */
|
|
/* <param name="len">Input buffer length</param> */
|
|
void bio_init_dec(unsigned char *bp, int len)
|
|
{
|
|
bio_start = bp;
|
|
bio_end = bp + len;
|
|
bio_bp = bp;
|
|
bio_buf = 0;
|
|
bio_ct = 0;
|
|
}
|
|
|
|
/* <summary> */
|
|
/* Write byte. --> function modified to eliminate longjmp !!! */
|
|
/* </summary> */
|
|
int bio_byteout()
|
|
{
|
|
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;
|
|
}
|
|
|
|
/* <summary> */
|
|
/* Read byte. --> function modified to eliminate longjmp !! */
|
|
/* </summary> */
|
|
int bio_bytein()
|
|
{
|
|
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;
|
|
}
|
|
|
|
/* <summary> */
|
|
/* Write bit. */
|
|
/* </summary> */
|
|
/* <param name="b">Bit to write (0 or 1)</param> */
|
|
void bio_putbit(int b)
|
|
{
|
|
if (bio_ct == 0) {
|
|
bio_byteout();
|
|
}
|
|
bio_ct--;
|
|
bio_buf |= b << bio_ct;
|
|
}
|
|
|
|
/* <summary> */
|
|
/* Read bit. */
|
|
/* </summary> */
|
|
int bio_getbit()
|
|
{
|
|
if (bio_ct == 0) {
|
|
bio_bytein();
|
|
}
|
|
bio_ct--;
|
|
return (bio_buf >> bio_ct) & 1;
|
|
}
|
|
|
|
/* <summary> */
|
|
/* Write bits. */
|
|
/* </summary> */
|
|
/* <param name="v">Value of bits</param> */
|
|
/* <param name="n">Number of bits to write</param> */
|
|
void bio_write(int v, int n)
|
|
{
|
|
int i;
|
|
for (i = n - 1; i >= 0; i--) {
|
|
bio_putbit((v >> i) & 1);
|
|
}
|
|
}
|
|
|
|
/* <summary> */
|
|
/* Read bits. */
|
|
/* </summary> */
|
|
/* <param name="n">Number of bits to read</param> */
|
|
int bio_read(int n)
|
|
{
|
|
int i, v;
|
|
v = 0;
|
|
for (i = n - 1; i >= 0; i--) {
|
|
v += bio_getbit() << i;
|
|
}
|
|
return v;
|
|
}
|
|
|
|
/* <summary> */
|
|
/* Flush bits. MOdified to eliminate longjmp !! */
|
|
/* </summary> */
|
|
int bio_flush()
|
|
{
|
|
bio_ct = 0;
|
|
if (bio_byteout())
|
|
return 1;
|
|
if (bio_ct == 7) {
|
|
bio_ct = 0;
|
|
|
|
if (bio_byteout())
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* <summary> */
|
|
/* </summary> */
|
|
int bio_inalign()
|
|
{
|
|
bio_ct = 0;
|
|
if ((bio_buf & 0xff) == 0xff) {
|
|
if (bio_bytein())
|
|
return 1;
|
|
bio_ct = 0;
|
|
}
|
|
return 0;
|
|
}
|