2 * Copyright (c) 2001-2003, David Janssens
3 * Copyright (c) 2002-2003, Yannick Verschueren
4 * Copyright (c) 2003-2005, Francois Devaux and Antonin Descampe
5 * Copyright (c) 2005, Hervé Drolon, FreeImage Team
6 * Copyright (c) 2002-2005, Communications and remote sensing Laboratory, Universite catholique de Louvain, Belgium
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGE.
31 #include "opj_includes.h"
33 /** @defgroup BIO BIO - Individual bit input-output stream */
36 /** @name Local static functions */
42 @param b Bit to write (0 or 1)
44 static void bio_putbit(opj_bio_t *bio, int b);
48 @return Returns the read bit
50 static int bio_getbit(opj_bio_t *bio);
54 @return Returns 0 if successful, returns 1 otherwise
56 static int bio_byteout(opj_bio_t *bio);
60 @return Returns 0 if successful, returns 1 otherwise
62 static int bio_bytein(opj_bio_t *bio);
69 ==========================================================
71 ==========================================================
74 static int bio_byteout(opj_bio_t *bio) {
75 bio->buf = (bio->buf << 8) & 0xffff;
76 bio->ct = bio->buf == 0xff00 ? 7 : 8;
77 if (bio->bp >= bio->end) {
80 *bio->bp++ = bio->buf >> 8;
84 static int bio_bytein(opj_bio_t *bio) {
85 bio->buf = (bio->buf << 8) & 0xffff;
86 bio->ct = bio->buf == 0xff00 ? 7 : 8;
87 if (bio->bp >= bio->end) {
90 bio->buf |= *bio->bp++;
94 static void bio_putbit(opj_bio_t *bio, int b) {
99 bio->buf |= b << bio->ct;
102 static int bio_getbit(opj_bio_t *bio) {
107 return (bio->buf >> bio->ct) & 1;
111 ==========================================================
112 Bit Input/Output interface
113 ==========================================================
116 opj_bio_t* bio_create() {
117 opj_bio_t *bio = (opj_bio_t*)opj_malloc(sizeof(opj_bio_t));
121 void bio_destroy(opj_bio_t *bio) {
127 int bio_numbytes(opj_bio_t *bio) {
128 return (int)(bio->bp - bio->start);
131 void bio_init_enc(opj_bio_t *bio, unsigned char *bp, int len) {
139 void bio_init_dec(opj_bio_t *bio, unsigned char *bp, int len) {
147 void bio_write(opj_bio_t *bio, int v, int n) {
149 for (i = n - 1; i >= 0; i--) {
150 bio_putbit(bio, (v >> i) & 1);
154 int bio_read(opj_bio_t *bio, int n) {
157 for (i = n - 1; i >= 0; i--) {
158 v += bio_getbit(bio) << i;
163 int bio_flush(opj_bio_t *bio) {
165 if (bio_byteout(bio)) {
170 if (bio_byteout(bio)) {
177 int bio_inalign(opj_bio_t *bio) {
179 if ((bio->buf & 0xff) == 0xff) {
180 if (bio_bytein(bio)) {