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
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5 * are granted under this license.
7 * Copyright (c) 2002-2014, Universite catholique de Louvain (UCL), Belgium
8 * Copyright (c) 2002-2014, Professor Benoit Macq
9 * Copyright (c) 2001-2003, David Janssens
10 * Copyright (c) 2002-2003, Yannick Verschueren
11 * Copyright (c) 2003-2007, Francois-Olivier Devaux
12 * Copyright (c) 2003-2014, Antonin Descampe
13 * Copyright (c) 2005, Herve Drolon, FreeImage Team
14 * All rights reserved.
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17 * modification, are permitted provided that the following conditions
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38 #include "opj_includes.h"
40 /** @defgroup BIO BIO - Individual bit input-output stream */
43 /** @name Local static functions */
49 @return Returns the read bit
51 static OPJ_UINT32 opj_bio_getbit(opj_bio_t *bio);
55 @return Returns OPJ_TRUE if successful, returns OPJ_FALSE otherwise
57 static OPJ_BOOL opj_bio_byteout(opj_bio_t *bio);
61 @return Returns OPJ_TRUE if successful, returns OPJ_FALSE otherwise
63 static OPJ_BOOL opj_bio_bytein(opj_bio_t *bio);
70 ==========================================================
72 ==========================================================
75 static OPJ_BOOL opj_bio_byteout(opj_bio_t *bio)
77 bio->buf = (bio->buf << 8) & 0xffff;
78 bio->ct = bio->buf == 0xff00 ? 7 : 8;
79 if ((OPJ_SIZE_T)bio->bp >= (OPJ_SIZE_T)bio->end) {
82 *bio->bp++ = (OPJ_BYTE)(bio->buf >> 8);
86 static OPJ_BOOL opj_bio_bytein(opj_bio_t *bio)
88 bio->buf = (bio->buf << 8) & 0xffff;
89 bio->ct = bio->buf == 0xff00 ? 7 : 8;
90 if ((OPJ_SIZE_T)bio->bp >= (OPJ_SIZE_T)bio->end) {
93 bio->buf |= *bio->bp++;
97 static OPJ_UINT32 opj_bio_getbit(opj_bio_t *bio)
101 bio); /* MSD: why not check the return value of this function ? */
104 return (bio->buf >> bio->ct) & 1;
108 ==========================================================
109 Bit Input/Output interface
110 ==========================================================
113 opj_bio_t* opj_bio_create(void)
115 opj_bio_t *bio = (opj_bio_t*)opj_malloc(sizeof(opj_bio_t));
119 void opj_bio_destroy(opj_bio_t *bio)
126 ptrdiff_t opj_bio_numbytes(opj_bio_t *bio)
128 return (bio->bp - bio->start);
131 void opj_bio_init_enc(opj_bio_t *bio, OPJ_BYTE *bp, OPJ_UINT32 len)
140 void opj_bio_init_dec(opj_bio_t *bio, OPJ_BYTE *bp, OPJ_UINT32 len)
149 void opj_bio_putbit(opj_bio_t *bio, OPJ_UINT32 b)
153 bio); /* MSD: why not check the return value of this function ? */
156 bio->buf |= b << bio->ct;
159 void opj_bio_write(opj_bio_t *bio, OPJ_UINT32 v, OPJ_UINT32 n)
163 assert((n > 0U) && (n <= 32U));
164 for (i = (OPJ_INT32)n - 1; i >= 0; i--) {
165 opj_bio_putbit(bio, (v >> i) & 1);
169 OPJ_UINT32 opj_bio_read(opj_bio_t *bio, OPJ_UINT32 n)
174 assert((n > 0U) /* && (n <= 32U)*/);
175 #ifdef OPJ_UBSAN_BUILD
176 /* This assert fails for some corrupted images which are gracefully rejected */
177 /* Add this assert only for ubsan build. */
178 /* This is the condition for overflow not to occur below which is needed because of OPJ_NOSANITIZE */
182 for (i = (OPJ_INT32)n - 1; i >= 0; i--) {
183 v |= opj_bio_getbit(bio) <<
184 i; /* can't overflow, opj_bio_getbit returns 0 or 1 */
189 OPJ_BOOL opj_bio_flush(opj_bio_t *bio)
191 if (! opj_bio_byteout(bio)) {
195 if (! opj_bio_byteout(bio)) {
202 OPJ_BOOL opj_bio_inalign(opj_bio_t *bio)
204 if ((bio->buf & 0xff) == 0xff) {
205 if (! opj_bio_bytein(bio)) {