2 * Copyright (c) 2001-2003, David Janssens
3 * Copyright (c) 2002-2003, Yannick Verschueren
4 * Copyright (c) 2003-2005, Francois Devaux and Antonin Descampe
5 * Copyright (c) 2005, Hervé Drolon, FreeImage Team
6 * Copyright (c) 2002-2005, Communications and remote sensing Laboratory, Universite catholique de Louvain, Belgium
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGE.
31 #include "opj_includes.h"
33 /* ----------------------------------------------------------------------- */
35 opj_cio_t* opj_cio_open(opj_common_ptr cinfo, unsigned char *buffer, int length) {
37 opj_cio_t *cio = (opj_cio_t*)opj_malloc(sizeof(opj_cio_t));
40 if(buffer && length) {
41 /* wrap a user buffer containing the encoded image */
42 cio->openmode = OPJ_STREAM_READ;
46 else if(!buffer && !length && cinfo) {
47 /* allocate a buffer for the encoded image */
48 cio->openmode = OPJ_STREAM_WRITE;
49 switch(cinfo->codec_format) {
51 cp = ((opj_j2k_t*)cinfo->j2k_handle)->cp;
54 cp = ((opj_jp2_t*)cinfo->jp2_handle)->j2k->cp;
60 cio->length = cp->tdx * cp->tdy * cp->tw * cp->th * 4;
61 cio->buffer = (unsigned char *)opj_malloc(cio->length);
72 /* Initialize byte IO */
73 cio->start = cio->buffer;
74 cio->end = cio->buffer + cio->length;
75 cio->bp = cio->buffer;
80 void opj_cio_close(opj_cio_t *cio) {
82 if(cio->openmode == OPJ_STREAM_WRITE) {
83 /* destroy the allocated buffer */
84 opj_free(cio->buffer);
92 /* ----------------------------------------------------------------------- */
95 * Get position in byte stream.
97 int cio_tell(opj_cio_t *cio) {
98 return cio->bp - cio->start;
102 * Set position in byte stream.
104 * pos : position, in number of bytes, from the beginning of the stream
106 void cio_seek(opj_cio_t *cio, int pos) {
107 cio->bp = cio->start + pos;
111 * Number of bytes left before the end of the stream.
113 int cio_numbytesleft(opj_cio_t *cio) {
114 return cio->end - cio->bp;
118 * Get pointer to the current position in the stream.
120 unsigned char *cio_getbp(opj_cio_t *cio) {
127 bool cio_byteout(opj_cio_t *cio, unsigned char v) {
128 if (cio->bp >= cio->end) {
129 opj_event_msg(cio->cinfo, EVT_ERROR, "write error\n");
139 unsigned char cio_bytein(opj_cio_t *cio) {
140 if (cio->bp >= cio->end) {
141 opj_event_msg(cio->cinfo, EVT_ERROR, "read error\n");
151 * n : number of bytes to write
153 unsigned int cio_write(opj_cio_t *cio, unsigned int v, int n) {
155 for (i = n - 1; i >= 0; i--) {
156 if( !cio_byteout(cio, (unsigned char) ((v >> (i << 3)) & 0xff)) )
165 * n : number of bytes to read
167 * return : value of the n bytes read
169 unsigned int cio_read(opj_cio_t *cio, int n) {
173 for (i = n - 1; i >= 0; i--) {
174 v += cio_bytein(cio) << (i << 3);
182 * n : number of bytes to skip
184 void cio_skip(opj_cio_t *cio, int n) {