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