2 * The copyright in this software is being made available under the 2-clauses
3 * BSD License, included below. This software may be subject to other third
4 * party and contributor rights, including patent rights, and no such rights
5 * are granted under this license.
7 * Copyright (c) 2001-2003, David Janssens
8 * Copyright (c) 2002-2003, Yannick Verschueren
9 * Copyright (c) 2003-2005, Francois Devaux and Antonin Descampe
10 * Copyright (c) 2005, Herve Drolon, FreeImage Team
11 * Copyright (c) 2002-2005, Communications and remote sensing Laboratory, Universite catholique de Louvain, Belgium
12 * All rights reserved.
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15 * modification, are permitted provided that the following conditions
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29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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33 * POSSIBILITY OF SUCH DAMAGE.
36 #include "opj_includes.h"
38 /** @defgroup BIO BIO - Individual bit input-output stream */
41 /** @name Local static functions */
47 @param b Bit to write (0 or 1)
49 static void bio_putbit(opj_bio_t *bio, int b);
53 @return Returns the read bit
55 static int bio_getbit(opj_bio_t *bio);
59 @return Returns 0 if successful, returns 1 otherwise
61 static int bio_byteout(opj_bio_t *bio);
65 @return Returns 0 if successful, returns 1 otherwise
67 static int bio_bytein(opj_bio_t *bio);
75 ==========================================================
77 ==========================================================
80 static int bio_byteout(opj_bio_t *bio)
82 bio->buf = (bio->buf << 8) & 0xffff;
83 bio->ct = bio->buf == 0xff00 ? 7 : 8;
84 if (bio->bp >= bio->end) {
87 *bio->bp++ = bio->buf >> 8;
91 static int bio_bytein(opj_bio_t *bio)
93 bio->buf = (bio->buf << 8) & 0xffff;
94 bio->ct = bio->buf == 0xff00 ? 7 : 8;
95 if (bio->bp >= bio->end) {
98 bio->buf |= *bio->bp++;
102 static void bio_putbit(opj_bio_t *bio, int b)
108 bio->buf |= b << bio->ct;
112 static int bio_getbit(opj_bio_t *bio)
119 return (bio->buf >> bio->ct) & 1;
123 ==========================================================
124 Bit Input/Output interface
125 ==========================================================
128 opj_bio_t* bio_create()
130 opj_bio_t *bio = (opj_bio_t*)opj_malloc(sizeof(opj_bio_t));
134 void bio_destroy(opj_bio_t *bio)
141 int bio_numbytes(opj_bio_t *bio)
143 return (bio->bp - bio->start);
146 void bio_init_enc(opj_bio_t *bio, unsigned char *bp, int len)
155 void bio_init_dec(opj_bio_t *bio, unsigned char *bp, int len)
164 void bio_write(opj_bio_t *bio, int v, int n)
167 for (i = n - 1; i >= 0; i--) {
168 bio_putbit(bio, (v >> i) & 1);
172 int bio_read(opj_bio_t *bio, int n)
176 for (i = n - 1; i >= 0; i--) {
177 v += bio_getbit(bio) << i;
182 int bio_flush(opj_bio_t *bio)
185 if (bio_byteout(bio)) {
190 if (bio_byteout(bio)) {
197 int bio_inalign(opj_bio_t *bio)
200 if ((bio->buf & 0xff) == 0xff) {
201 if (bio_bytein(bio)) {