2 * Copyright (c) 2002-2007, Communications and Remote Sensing Laboratory, Universite catholique de Louvain (UCL), Belgium
3 * Copyright (c) 2002-2007, Professor Benoit Macq
4 * Copyright (c) 2001-2003, David Janssens
5 * Copyright (c) 2002-2003, Yannick Verschueren
6 * Copyright (c) 2003-2007, Francois-Olivier Devaux and Antonin Descampe
7 * Copyright (c) 2005, Herve Drolon, FreeImage Team
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
20 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
23 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
32 #include "opj_includes.h"
34 /* ----------------------------------------------------------------------- */
36 opj_cio_t* OPJ_CALLCONV opj_cio_open(opj_common_ptr cinfo, unsigned char *buffer, int length) {
38 opj_cio_t *cio = (opj_cio_t*)opj_malloc(sizeof(opj_cio_t));
41 if(buffer && length) {
42 /* wrap a user buffer containing the encoded image */
43 cio->openmode = OPJ_STREAM_READ;
47 else if(!buffer && !length && cinfo) {
48 /* allocate a buffer for the encoded image */
49 cio->openmode = OPJ_STREAM_WRITE;
50 switch(cinfo->codec_format) {
52 cp = ((opj_j2k_t*)cinfo->j2k_handle)->cp;
55 cp = ((opj_jp2_t*)cinfo->jp2_handle)->j2k->cp;
61 cio->length = (int) (0.1625 * cp->img_size); /* 0.1625 = 1.3/8 */
62 cio->buffer = (unsigned char *)opj_malloc(cio->length);
73 /* Initialize byte IO */
74 cio->start = cio->buffer;
75 cio->end = cio->buffer + cio->length;
76 cio->bp = cio->buffer;
81 void OPJ_CALLCONV opj_cio_close(opj_cio_t *cio) {
83 if(cio->openmode == OPJ_STREAM_WRITE) {
84 /* destroy the allocated buffer */
85 opj_free(cio->buffer);
93 /* ----------------------------------------------------------------------- */
96 * Get position in byte stream.
98 int OPJ_CALLCONV cio_tell(opj_cio_t *cio) {
99 return cio->bp - cio->start;
103 * Set position in byte stream.
105 * pos : position, in number of bytes, from the beginning of the stream
107 void OPJ_CALLCONV cio_seek(opj_cio_t *cio, int pos) {
108 cio->bp = cio->start + pos;
112 * Number of bytes left before the end of the stream.
114 int cio_numbytesleft(opj_cio_t *cio) {
115 return cio->end - cio->bp;
119 * Get pointer to the current position in the stream.
121 unsigned char *cio_getbp(opj_cio_t *cio) {
128 bool cio_byteout(opj_cio_t *cio, unsigned char v) {
129 if (cio->bp >= cio->end) {
130 opj_event_msg(cio->cinfo, EVT_ERROR, "write error\n");
140 unsigned char cio_bytein(opj_cio_t *cio) {
141 if (cio->bp >= cio->end) {
142 opj_event_msg(cio->cinfo, EVT_ERROR, "read error\n");
152 * n : number of bytes to write
154 unsigned int cio_write(opj_cio_t *cio, unsigned int v, int n) {
156 for (i = n - 1; i >= 0; i--) {
157 if( !cio_byteout(cio, (unsigned char) ((v >> (i << 3)) & 0xff)) )
166 * n : number of bytes to read
168 * return : value of the n bytes read
170 unsigned int cio_read(opj_cio_t *cio, int n) {
174 for (i = n - 1; i >= 0; i--) {
175 v += cio_bytein(cio) << (i << 3);
183 * n : number of bytes to skip
185 void cio_skip(opj_cio_t *cio, int n) {