1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
|
/* Copyright (C) 2001-2012 Artifex Software, Inc.
All Rights Reserved.
This software is provided AS-IS with no warranty, either express or
implied.
This software is distributed under license and may not be copied,
modified or distributed except as expressly authorized under the terms
of the license contained in the file LICENSE in this distribution.
Refer to licensing information at http://www.artifex.com or contact
Artifex Software, Inc., 7 Mt. Lassen Drive - Suite A-134, San Rafael,
CA 94903, U.S.A., +1(415)492-9861, for further information.
*/
/*
jbig2dec
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "os_types.h"
#include <stdlib.h>
#include <string.h>
#include "jbig2.h"
#include "jbig2_priv.h"
#include "jbig2_metadata.h"
/* metadata key,value list object */
Jbig2Metadata *
jbig2_metadata_new(Jbig2Ctx *ctx, Jbig2Encoding encoding)
{
Jbig2Metadata *md = jbig2_new(ctx, Jbig2Metadata, 1);
if (md != NULL) {
md->encoding = encoding;
md->entries = 0;
md->max_entries = 4;
md->keys = jbig2_new(ctx, char *, md->max_entries);
md->values = jbig2_new(ctx, char *, md->max_entries);
if (md->keys == NULL || md->values == NULL) {
jbig2_error(ctx, JBIG2_SEVERITY_FATAL, -1, "failed to allocate storage for metadata keys/values");
jbig2_metadata_free(ctx, md);
md = NULL;
}
} else {
jbig2_error(ctx, JBIG2_SEVERITY_FATAL, -1, "failed to allocate storage for metadata");
}
return md;
}
void
jbig2_metadata_free(Jbig2Ctx *ctx, Jbig2Metadata *md)
{
int i;
if (md->keys) {
/* assume we own the pointers */
for (i = 0; i < md->entries; i++)
jbig2_free(ctx->allocator, md->keys[i]);
jbig2_free(ctx->allocator, md->keys);
}
if (md->values) {
for (i = 0; i < md->entries; i++)
jbig2_free(ctx->allocator, md->values[i]);
jbig2_free(ctx->allocator, md->values);
}
jbig2_free(ctx->allocator, md);
}
static char *
jbig2_strndup(Jbig2Ctx *ctx, const char *c, const int len)
{
char *s = jbig2_new(ctx, char, len);
if (s == NULL) {
jbig2_error(ctx, JBIG2_SEVERITY_FATAL, -1, "unable to duplicate comment string");
} else {
memcpy(s, c, len);
}
return s;
}
int
jbig2_metadata_add(Jbig2Ctx *ctx, Jbig2Metadata *md, const char *key, const int key_length, const char *value, const int value_length)
{
char **keys, **values;
/* grow the array if necessary */
if (md->entries == md->max_entries) {
md->max_entries <<= 1;
keys = jbig2_renew(ctx, md->keys, char *, md->max_entries);
values = jbig2_renew(ctx, md->values, char *, md->max_entries);
if (keys == NULL || values == NULL) {
jbig2_error(ctx, JBIG2_SEVERITY_FATAL, -1, "unable to resize metadata structure");
return -1;
}
md->keys = keys;
md->values = values;
}
/* copy the passed key,value pair */
md->keys[md->entries] = jbig2_strndup(ctx, key, key_length);
md->values[md->entries] = jbig2_strndup(ctx, value, value_length);
md->entries++;
return 0;
}
/* decode an ascii comment segment 7.4.15.1 */
int
jbig2_comment_ascii(Jbig2Ctx *ctx, Jbig2Segment *segment, const uint8_t *segment_data)
{
char *s = (char *)(segment_data + 4);
char *end = (char *)(segment_data + segment->data_length);
Jbig2Metadata *comment;
char *key, *value;
jbig2_error(ctx, JBIG2_SEVERITY_INFO, segment->number, "ASCII comment data");
comment = jbig2_metadata_new(ctx, JBIG2_ENCODING_ASCII);
if (comment == NULL) {
jbig2_error(ctx, JBIG2_SEVERITY_WARNING, segment->number, "unable to allocate comment structure");
return -1;
}
/* loop over the segment data pulling out the key,value pairs */
while (s < end && *s) {
key = s;
value = memchr(key, '\0', end - key);
if (!value)
goto too_short;
value++;
s = memchr(value, '\0', end - value);
if (!s)
goto too_short;
s++;
jbig2_metadata_add(ctx, comment, key, value - key, value, s - value);
jbig2_error(ctx, JBIG2_SEVERITY_INFO, segment->number, "'%s'\t'%s'", key, value);
}
/* TODO: associate with ctx, page, or referred-to segment(s) */
segment->result = comment;
return 0;
too_short:
jbig2_metadata_free(ctx, comment);
return jbig2_error(ctx, JBIG2_SEVERITY_WARNING, segment->number, "unexpected end of comment segment");
}
/* decode a UCS-16 comment segement 7.4.15.2 */
int
jbig2_comment_unicode(Jbig2Ctx *ctx, Jbig2Segment *segment, const uint8_t *segment_data)
{
return jbig2_error(ctx, JBIG2_SEVERITY_WARNING, segment->number, "unhandled unicode comment segment");
}
|
