2 * Copyright (c) 2002-2007, Communications and Remote Sensing Laboratory, Universite catholique de Louvain (UCL), Belgium
3 * Copyright (c) 2002-2007, Professor Benoit Macq
4 * Copyright (c) 2001-2003, David Janssens
5 * Copyright (c) 2002-2003, Yannick Verschueren
6 * Copyright (c) 2003-2007, Francois-Olivier Devaux and Antonin Descampe
7 * Copyright (c) 2005, Herve Drolon, FreeImage Team
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
20 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
23 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
32 #include "opj_includes.h"
34 /** @defgroup BIO BIO - Individual bit input-output stream */
37 /** @name Local static functions */
43 @param b Bit to write (0 or 1)
45 static void bio_putbit(opj_bio_t *bio, unsigned int b);
49 @return Returns the read bit
51 static int bio_getbit(opj_bio_t *bio);
55 @return Returns 0 if successful, returns 1 otherwise
57 static int bio_byteout(opj_bio_t *bio);
61 @return Returns 0 if successful, returns 1 otherwise
63 static int bio_bytein(opj_bio_t *bio);
70 ==========================================================
72 ==========================================================
75 static int bio_byteout(opj_bio_t *bio) {
76 bio->buf = (bio->buf << 8) & 0xffff;
77 bio->ct = bio->buf == 0xff00 ? 7 : 8;
78 if (bio->bp >= bio->end) {
81 *bio->bp++ = (unsigned char)(bio->buf >> 8);
85 static int bio_bytein(opj_bio_t *bio) {
86 bio->buf = (bio->buf << 8) & 0xffff;
87 bio->ct = bio->buf == 0xff00 ? 7 : 8;
88 if (bio->bp >= bio->end) {
91 bio->buf |= *bio->bp++;
95 static void bio_putbit(opj_bio_t *bio, unsigned int b) {
100 bio->buf |= b << bio->ct;
103 static int bio_getbit(opj_bio_t *bio) {
108 return (bio->buf >> bio->ct) & 1;
112 ==========================================================
113 Bit Input/Output interface
114 ==========================================================
117 opj_bio_t* bio_create(void) {
118 opj_bio_t *bio = (opj_bio_t*)opj_malloc(sizeof(opj_bio_t));
122 void bio_destroy(opj_bio_t *bio) {
128 int bio_numbytes(opj_bio_t *bio) {
129 return (bio->bp - bio->start);
132 void bio_init_enc(opj_bio_t *bio, unsigned char *bp, int len) {
140 void bio_init_dec(opj_bio_t *bio, unsigned char *bp, int len) {
148 void bio_write(opj_bio_t *bio, int v, int n) {
150 for (i = n - 1; i >= 0; i--) {
151 bio_putbit(bio, (v >> i) & 1);
155 int bio_read(opj_bio_t *bio, int n) {
158 for (i = n - 1; i >= 0; i--) {
159 v += bio_getbit(bio) << i;
164 int bio_flush(opj_bio_t *bio) {
166 if (bio_byteout(bio)) {
171 if (bio_byteout(bio)) {
178 int bio_inalign(opj_bio_t *bio) {
180 if ((bio->buf & 0xff) == 0xff) {
181 if (bio_bytein(bio)) {