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
|
/*
* Copyright (C) 2003-2010 The Music Player Daemon Project
* http://www.musicpd.org
*
* 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 program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include "tag_ape.h"
#include "tag.h"
#include <glib.h>
#include <assert.h>
#include <stdio.h>
static const char *const ape_tag_names[] = {
[TAG_TITLE] = "title",
[TAG_ARTIST] = "artist",
[TAG_ALBUM] = "album",
[TAG_COMMENT] = "comment",
[TAG_GENRE] = "genre",
[TAG_TRACK] = "track",
[TAG_DATE] = "year"
};
static struct tag *
tag_ape_import_item(struct tag *tag, unsigned long flags,
const char *key, const char *value, size_t value_length)
{
/* we only care about utf-8 text tags */
if ((flags & (0x3 << 1)) != 0)
return tag;
for (unsigned i = 0; i < G_N_ELEMENTS(ape_tag_names); i++) {
if (ape_tag_names[i] != NULL &&
g_ascii_strcasecmp(key, ape_tag_names[i]) == 0) {
if (tag == NULL)
tag = tag_new();
tag_add_item_n(tag, i, value, value_length);
}
}
return tag;
}
struct tag *
tag_ape_load(const char *file)
{
struct tag *ret = NULL;
FILE *fp;
int tagCount;
char *buffer = NULL;
char *p;
size_t tagLen;
size_t size;
unsigned long flags;
char *key;
struct {
unsigned char id[8];
uint32_t version;
uint32_t length;
uint32_t tagCount;
unsigned char flags[4];
unsigned char reserved[8];
} footer;
fp = fopen(file, "r");
if (!fp)
return NULL;
/* determine if file has an apeV2 tag */
if (fseek(fp, 0, SEEK_END))
goto fail;
size = (size_t)ftell(fp);
if (fseek(fp, size - sizeof(footer), SEEK_SET))
goto fail;
if (fread(&footer, 1, sizeof(footer), fp) != sizeof(footer))
goto fail;
if (memcmp(footer.id, "APETAGEX", sizeof(footer.id)) != 0)
goto fail;
if (GUINT32_FROM_LE(footer.version) != 2000)
goto fail;
/* find beginning of ape tag */
tagLen = GUINT32_FROM_LE(footer.length);
if (tagLen <= sizeof(footer) + 10)
goto fail;
if (tagLen > 1024 * 1024)
/* refuse to load more than one megabyte of tag data */
goto fail;
if (fseek(fp, size - tagLen, SEEK_SET))
goto fail;
/* read tag into buffer */
tagLen -= sizeof(footer);
assert(tagLen > 10);
buffer = g_malloc(tagLen);
if (fread(buffer, 1, tagLen, fp) != tagLen)
goto fail;
/* read tags */
tagCount = GUINT32_FROM_LE(footer.tagCount);
p = buffer;
while (tagCount-- && tagLen > 10) {
size = GUINT32_FROM_LE(*(const uint32_t *)p);
p += 4;
tagLen -= 4;
flags = GUINT32_FROM_LE(*(const uint32_t *)p);
p += 4;
tagLen -= 4;
/* get the key */
key = p;
while (tagLen > size && *p != '\0') {
p++;
tagLen--;
}
p++;
tagLen--;
/* get the value */
if (tagLen < size)
goto fail;
ret = tag_ape_import_item(ret, flags, key, p, size);
p += size;
tagLen -= size;
}
fail:
if (fp)
fclose(fp);
g_free(buffer);
return ret;
}
|
