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
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
|
/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* load image decoder.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "plugin.h"
#include "imageviewer.h"
#include "image_decoder.h"
static const char *decoder_names[MAX_IMAGE_TYPES] = {
"bmp",
"jpeg",
"png",
#ifdef HAVE_LCD_COLOR
"ppm",
#endif
"gif"
};
/* Check file type by magic number or file extension
*
* If the file contains magic number, use it to determine image type.
* Otherwise use file extension to determine image type.
* If the file contains magic number and file extension is not correct,
* informs user that something is wrong.
*/
enum image_type get_image_type(const char *name, bool quiet)
{
static const struct {
char *ext;
enum image_type type;
} ext_list[] = {
{ ".bmp", IMAGE_BMP },
{ ".jpg", IMAGE_JPEG },
{ ".jpe", IMAGE_JPEG },
{ ".jpeg", IMAGE_JPEG },
{ ".png", IMAGE_PNG },
#ifdef HAVE_LCD_COLOR
{ ".ppm", IMAGE_PPM },
#endif
{ ".gif", IMAGE_GIF },
};
static const struct {
char *magic; /* magic number */
int length; /* length of the magic number */
enum image_type type;
} magic_list[] = {
{ "BM", 2, IMAGE_BMP },
{ "\xff\xd8\xff\xe0", 4, IMAGE_JPEG },
{ "\x89\x50\x4e\x47\x0d\x0a\x1a\x0a", 8, IMAGE_PNG },
#ifdef HAVE_LCD_COLOR
{ "P3", 2, IMAGE_PPM },
{ "P6", 2, IMAGE_PPM },
#endif
{ "GIF87a", 6, IMAGE_GIF },
{ "GIF89a", 6, IMAGE_GIF },
};
enum image_type type = IMAGE_UNKNOWN;
const char *ext = rb->strrchr(name, '.');
int i, fd;
char buf[12];
/* check file extention */
if (ext)
{
for (i = 0; i < (int)ARRAYLEN(ext_list); i++)
{
if (!rb->strcasecmp(ext, ext_list[i].ext))
{
type = ext_list[i].type;
break;
}
}
}
/* check magic value in the file */
fd = rb->open(name, O_RDONLY);
if (fd >= 0)
{
rb->memset(buf, 0, sizeof buf);
rb->read(fd, buf, sizeof buf);
rb->close(fd);
for (i = 0; i < (int)ARRAYLEN(magic_list); i++)
{
if (!rb->memcmp(buf, magic_list[i].magic, magic_list[i].length))
{
if (!quiet && type != magic_list[i].type)
{
/* file extension is wrong. */
rb->splashf(HZ*1, "Note: File extension is not correct");
}
type = magic_list[i].type;
break;
}
}
}
return type;
}
static void *decoder_handle = NULL;
const struct image_decoder *load_decoder(struct loader_info *loader_info)
{
const char *name;
char filename[MAX_PATH];
struct imgdec_header *hdr;
struct lc_header *lc_hdr;
if (loader_info->type < 0 || loader_info->type >= MAX_IMAGE_TYPES)
{
rb->splashf(2*HZ, "Unknown type: %d", loader_info->type);
goto error;
}
release_decoder();
name = decoder_names[loader_info->type];
rb->snprintf(filename, MAX_PATH, VIEWERS_DIR "/%s.ovl", name);
/* load decoder to the buffer. */
decoder_handle = rb->lc_open(filename, loader_info->buffer, loader_info->size);
if (!decoder_handle)
{
rb->splashf(2*HZ, "Can't open %s", filename);
goto error;
}
hdr = rb->lc_get_header(decoder_handle);
if (!hdr)
{
rb->splash(2*HZ, "Can't get header");
goto error_close;
}
lc_hdr = &hdr->lc_hdr;
if (lc_hdr->magic != PLUGIN_MAGIC || lc_hdr->target_id != TARGET_ID)
{
rb->splashf(2*HZ, "%s decoder: Incompatible model.", name);
goto error_close;
}
if (lc_hdr->api_version != IMGDEC_API_VERSION)
{
rb->splashf(2*HZ, "%s decoder: Incompatible version.", name);
goto error_close;
}
*(hdr->api) = rb;
*(hdr->img_api) = loader_info->iv;
/* set remaining buffer size to loader_info. decoder will
* be loaded to the end of the buffer, so fix size only. */
#if (CONFIG_PLATFORM & PLATFORM_NATIVE)
loader_info->size = lc_hdr->load_addr - loader_info->buffer;
#endif
return hdr->decoder;
error_close:
release_decoder();
error:
return NULL;
}
void release_decoder(void)
{
if (decoder_handle != NULL)
{
rb->lc_close(decoder_handle);
decoder_handle = NULL;
}
}
|
