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) 2002-2003, Yannick Verschueren
5 * Copyright (c) 2005, Herve Drolon, FreeImage Team
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
21 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
22 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
25 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
27 * POSSIBILITY OF SUCH DAMAGE.
30 #include "opj_includes.h"
33 * Read the information contains in VBAS [JPP/JPT stream message header]
34 * Store information (7 bits) in value
37 unsigned int jpt_read_VBAS_info(opj_cio_t *cio, unsigned int value) {
40 elmt = cio_read(cio, 1);
41 while ((elmt >> 7) == 1) {
43 value |= (elmt & 0x7f);
44 elmt = cio_read(cio, 1);
47 value |= (elmt & 0x7f);
53 * Initialize the value of the message header structure
56 void jpt_init_msg_header(opj_jpt_msg_header_t * header) {
57 header->Id = 0; /* In-class Identifier */
58 header->last_byte = 0; /* Last byte information */
59 header->Class_Id = 0; /* Class Identifier */
60 header->CSn_Id = 0; /* CSn : index identifier */
61 header->Msg_offset = 0; /* Message offset */
62 header->Msg_length = 0; /* Message length */
63 header->Layer_nb = 0; /* Auxiliary for JPP case */
67 * Re-initialize the value of the message header structure
69 * Only parameters always present in message header
72 void jpt_reinit_msg_header(opj_jpt_msg_header_t * header) {
73 header->Id = 0; /* In-class Identifier */
74 header->last_byte = 0; /* Last byte information */
75 header->Msg_offset = 0; /* Message offset */
76 header->Msg_length = 0; /* Message length */
80 * Read the message header for a JPP/JPT - stream
83 void jpt_read_msg_header(opj_common_ptr cinfo, opj_cio_t *cio, opj_jpt_msg_header_t *header) {
84 unsigned char elmt, Class = 0, CSn = 0;
85 jpt_reinit_msg_header(header);
90 elmt = cio_read(cio, 1);
92 /* See for Class and CSn */
93 switch ((elmt >> 5) & 0x03) {
95 opj_event_msg(cinfo, EVT_ERROR, "Forbidden value encounter in message header !!\n");
113 /* see information on bits 'c' [p 10 : A.2.1 general, ISO/IEC FCD 15444-9] */
114 if (((elmt >> 4) & 0x01) == 1)
115 header->last_byte = 1;
117 /* In-class identifier */
118 header->Id |= (elmt & 0x0f);
119 if ((elmt >> 7) == 1)
120 header->Id = jpt_read_VBAS_info(cio, header->Id);
126 header->Class_Id = 0;
127 header->Class_Id = jpt_read_VBAS_info(cio, header->Class_Id);
135 header->CSn_Id = jpt_read_VBAS_info(cio, header->CSn_Id);
138 /* ----------------- */
139 /* VBAS : Msg_offset */
140 /* ----------------- */
141 header->Msg_offset = jpt_read_VBAS_info(cio, header->Msg_offset);
143 /* ----------------- */
144 /* VBAS : Msg_length */
145 /* ----------------- */
146 header->Msg_length = jpt_read_VBAS_info(cio, header->Msg_length);
151 if ((header->Class_Id & 0x01) == 1) {
152 header->Layer_nb = 0;
153 header->Layer_nb = jpt_read_VBAS_info(cio, header->Layer_nb);