2 * Copyright (c) 2002-2007, Communications and Remote Sensing Laboratory, Universite catholique de Louvain (UCL), Belgium
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3 * Copyright (c) 2002-2007, Professor Benoit Macq
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4 * Copyright (c) 2001-2003, David Janssens
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5 * Copyright (c) 2002-2003, Yannick Verschueren
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6 * Copyright (c) 2003-2007, Francois-Olivier Devaux and Antonin Descampe
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7 * Copyright (c) 2005, Herve Drolon, FreeImage Team
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8 * Copyright (c) 2008, Jerome Fimes, Communications & Systemes <jerome.fimes@c-s.fr>
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9 * All rights reserved.
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11 * Redistribution and use in source and binary forms, with or without
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12 * modification, are permitted provided that the following conditions
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14 * 1. Redistributions of source code must retain the above copyright
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15 * notice, this list of conditions and the following disclaimer.
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16 * 2. Redistributions in binary form must reproduce the above copyright
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17 * notice, this list of conditions and the following disclaimer in the
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18 * documentation and/or other materials provided with the distribution.
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20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
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21 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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30 * POSSIBILITY OF SUCH DAMAGE.
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34 #include "opj_malloc.h"
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36 /** @defgroup BIO BIO - Individual bit input-output stream */
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39 /** @name Local static functions */
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44 @param bio BIO handle
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45 @param b Bit to write (0 or 1)
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47 static void bio_putbit(opj_bio_t *bio, OPJ_UINT32 b);
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50 @param bio BIO handle
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51 @return Returns the read bit
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53 static OPJ_UINT32 bio_getbit(opj_bio_t *bio);
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56 @param bio BIO handle
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57 @return Returns 0 if successful, returns 1 otherwise
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59 static bool bio_byteout(opj_bio_t *bio);
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62 @param bio BIO handle
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63 @return Returns 0 if successful, returns 1 otherwise
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65 static bool bio_bytein(opj_bio_t *bio);
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72 ==========================================================
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74 ==========================================================
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77 static bool bio_byteout(opj_bio_t *bio) {
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78 bio->buf = (bio->buf << 8) & 0xffff;
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79 bio->ct = bio->buf == 0xff00 ? 7 : 8;
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80 if (bio->bp >= bio->end) {
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83 *bio->bp++ = bio->buf >> 8;
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87 static bool bio_bytein(opj_bio_t *bio) {
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88 bio->buf = (bio->buf << 8) & 0xffff;
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89 bio->ct = bio->buf == 0xff00 ? 7 : 8;
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90 if (bio->bp >= bio->end) {
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93 bio->buf |= *bio->bp++;
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97 static void bio_putbit(opj_bio_t *bio, OPJ_UINT32 b) {
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102 bio->buf |= b << bio->ct;
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105 static OPJ_UINT32 bio_getbit(opj_bio_t *bio) {
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106 if (bio->ct == 0) {
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110 return (bio->buf >> bio->ct) & 1;
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114 ==========================================================
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115 Bit Input/Output interface
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116 ==========================================================
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119 opj_bio_t* bio_create(void) {
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120 opj_bio_t *bio = (opj_bio_t*)opj_malloc(sizeof(opj_bio_t));
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124 void bio_destroy(opj_bio_t *bio) {
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130 OPJ_UINT32 bio_numbytes(opj_bio_t *bio) {
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131 return (bio->bp - bio->start);
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134 void bio_init_enc(opj_bio_t *bio, OPJ_BYTE *bp, OPJ_UINT32 len) {
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136 bio->end = bp + len;
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142 void bio_init_dec(opj_bio_t *bio, OPJ_BYTE *bp, OPJ_UINT32 len) {
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144 bio->end = bp + len;
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150 void bio_write(opj_bio_t *bio, OPJ_UINT32 v, OPJ_UINT32 n) {
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152 for (i = n - 1; i != -1 ; --i) {
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153 bio_putbit(bio, (v >> i) & 1);
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157 OPJ_UINT32 bio_read(opj_bio_t *bio, OPJ_UINT32 n) {
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160 for (i = n - 1; i != -1 ; --i) {
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161 v += bio_getbit(bio) << i;
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166 bool bio_flush(opj_bio_t *bio) {
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168 if (bio_byteout(bio)) {
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171 if (bio->ct == 7) {
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173 if (bio_byteout(bio)) {
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180 bool bio_inalign(opj_bio_t *bio) {
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182 if ((bio->buf & 0xff) == 0xff) {
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183 if (bio_bytein(bio)) {
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