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