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-rw-r--r--libraries/openjpeg-libsl/libopenjpeg/jpt.c155
1 files changed, 155 insertions, 0 deletions
diff --git a/libraries/openjpeg-libsl/libopenjpeg/jpt.c b/libraries/openjpeg-libsl/libopenjpeg/jpt.c
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1/*
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
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
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.
16 *
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.
28 */
29
30#include "opj_includes.h"
31
32/*
33 * Read the information contains in VBAS [JPP/JPT stream message header]
34 * Store information (7 bits) in value
35 *
36 */
37unsigned int jpt_read_VBAS_info(opj_cio_t *cio, unsigned int value) {
38 unsigned char elmt;
39
40 elmt = cio_read(cio, 1);
41 while ((elmt >> 7) == 1) {
42 value = (value << 7);
43 value |= (elmt & 0x7f);
44 elmt = cio_read(cio, 1);
45 }
46 value = (value << 7);
47 value |= (elmt & 0x7f);
48
49 return value;
50}
51
52/*
53 * Initialize the value of the message header structure
54 *
55 */
56void 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 */
64}
65
66/*
67 * Re-initialize the value of the message header structure
68 *
69 * Only parameters always present in message header
70 *
71 */
72void 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 */
77}
78
79/*
80 * Read the message header for a JPP/JPT - stream
81 *
82 */
83void 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);
86
87 /* ------------- */
88 /* VBAS : Bin-ID */
89 /* ------------- */
90 elmt = cio_read(cio, 1);
91
92 /* See for Class and CSn */
93 switch ((elmt >> 5) & 0x03) {
94 case 0:
95 opj_event_msg(cinfo, EVT_ERROR, "Forbidden value encounter in message header !!\n");
96 break;
97 case 1:
98 Class = 0;
99 CSn = 0;
100 break;
101 case 2:
102 Class = 1;
103 CSn = 0;
104 break;
105 case 3:
106 Class = 1;
107 CSn = 1;
108 break;
109 default:
110 break;
111 }
112
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;
116
117 /* In-class identifier */
118 header->Id |= (elmt & 0x0f);
119 if ((elmt >> 7) == 1)
120 header->Id = jpt_read_VBAS_info(cio, header->Id);
121
122 /* ------------ */
123 /* VBAS : Class */
124 /* ------------ */
125 if (Class == 1) {
126 header->Class_Id = 0;
127 header->Class_Id = jpt_read_VBAS_info(cio, header->Class_Id);
128 }
129
130 /* ---------- */
131 /* VBAS : CSn */
132 /* ---------- */
133 if (CSn == 1) {
134 header->CSn_Id = 0;
135 header->CSn_Id = jpt_read_VBAS_info(cio, header->CSn_Id);
136 }
137
138 /* ----------------- */
139 /* VBAS : Msg_offset */
140 /* ----------------- */
141 header->Msg_offset = jpt_read_VBAS_info(cio, header->Msg_offset);
142
143 /* ----------------- */
144 /* VBAS : Msg_length */
145 /* ----------------- */
146 header->Msg_length = jpt_read_VBAS_info(cio, header->Msg_length);
147
148 /* ---------- */
149 /* VBAS : Aux */
150 /* ---------- */
151 if ((header->Class_Id & 0x01) == 1) {
152 header->Layer_nb = 0;
153 header->Layer_nb = jpt_read_VBAS_info(cio, header->Layer_nb);
154 }
155}