2 * Copyright (c) 2004, Yannick Verschueren
3 * Copyright (c) 2005, Hervé Drolon, FreeImage Team
4 * Copyright (c) 2002-2005, Communications and remote sensing Laboratory, Universite catholique de Louvain, Belgium
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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29 #include "opj_includes.h"
32 * Read the information contains in VBAS [JPP/JPT stream message header]
33 * Store information (7 bits) in value
36 unsigned int jpt_read_VBAS_info(opj_cio_t *cio, unsigned int value) {
39 elmt = cio_read(cio, 1);
40 while ((elmt >> 7) == 1) {
42 value |= (elmt & 0x7f);
43 elmt = cio_read(cio, 1);
46 value |= (elmt & 0x7f);
52 * Initialize the value of the message header structure
55 void jpt_init_msg_header(opj_jpt_msg_header_t * header) {
56 header->Id = 0; /* In-class Identifier */
57 header->last_byte = 0; /* Last byte information */
58 header->Class_Id = 0; /* Class Identifier */
59 header->CSn_Id = 0; /* CSn : index identifier */
60 header->Msg_offset = 0; /* Message offset */
61 header->Msg_length = 0; /* Message length */
62 header->Layer_nb = 0; /* Auxiliary for JPP case */
66 * Re-initialize the value of the message header structure
68 * Only parameters always present in message header
71 void jpt_reinit_msg_header(opj_jpt_msg_header_t * header) {
72 header->Id = 0; /* In-class Identifier */
73 header->last_byte = 0; /* Last byte information */
74 header->Msg_offset = 0; /* Message offset */
75 header->Msg_length = 0; /* Message length */
79 * Read the message header for a JPP/JPT - stream
82 void jpt_read_msg_header(opj_common_ptr cinfo, opj_cio_t *cio, opj_jpt_msg_header_t *header) {
83 unsigned char elmt, Class = 0, CSn = 0;
84 jpt_reinit_msg_header(header);
89 elmt = cio_read(cio, 1);
91 /* See for Class and CSn */
92 switch ((elmt >> 5) & 0x03) {
94 opj_event_msg(cinfo, EVT_ERROR, "Forbidden value encounter in message header !!\n");
112 /* see information on bits 'c' [p 10 : A.2.1 general, ISO/IEC FCD 15444-9] */
113 if (((elmt >> 4) & 0x01) == 1)
114 header->last_byte = 1;
116 /* In-class identifier */
117 header->Id |= (elmt & 0x0f);
118 if ((elmt >> 7) == 1)
119 header->Id = jpt_read_VBAS_info(cio, header->Id);
125 header->Class_Id = 0;
126 header->Class_Id = jpt_read_VBAS_info(cio, header->Class_Id);
134 header->CSn_Id = jpt_read_VBAS_info(cio, header->CSn_Id);
137 /* ----------------- */
138 /* VBAS : Msg_offset */
139 /* ----------------- */
140 header->Msg_offset = jpt_read_VBAS_info(cio, header->Msg_offset);
142 /* ----------------- */
143 /* VBAS : Msg_length */
144 /* ----------------- */
145 header->Msg_length = jpt_read_VBAS_info(cio, header->Msg_length);
150 if ((header->Class_Id & 0x01) == 1) {
151 header->Layer_nb = 0;
152 header->Layer_nb = jpt_read_VBAS_info(cio, header->Layer_nb);