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
|
#include "nsid3v2.h"
#include "nsid3v2/header.h"
#include "nsid3v2/tag.h"
#include "nsid3v2/frame_utils.h"
#include "nu/ByteReader.h"
#include "nu/ByteWriter.h"
#include "nx/nxstring.h"
struct ParsedID
{
ParsedString owner;
const void *identifier_data;
size_t identifier_byte_length;
};
static int ParseID(const void *data, size_t data_len, ParsedID &parsed)
{
int ret;
if (data_len < 1)
return NErr_Insufficient;
bytereader_value_t byte_reader;
bytereader_init(&byte_reader, data, data_len);
/* owner is always latin-1 */
ret = ParseNullTerminatedString(&byte_reader, 0, parsed.owner);
if (ret != NErr_Success)
return ret;
parsed.identifier_data = bytereader_pointer(&byte_reader);
parsed.identifier_byte_length = bytereader_size(&byte_reader);
return NErr_Success;
}
int NSID3v2_Tag_ID_Find(const nsid3v2_tag_t t, const char *owner, nsid3v2_frame_t *out_frame, int text_flags)
{
const ID3v2::Tag *tag = (const ID3v2::Tag *)t;
if (!tag)
return NErr_Empty;
const ID3v2::Frame *frame = tag->FindFirstFrame(NSID3V2_FRAME_ID);
while (frame)
{
const void *data;
size_t data_len;
ParsedID parsed;
if (frame->GetData(&data, &data_len) == NErr_Success && data_len > 0 && ParseID(data, data_len, parsed) == NErr_Success && (!owner || DescriptionMatches(parsed.owner, owner, text_flags)))
{
*out_frame = (nsid3v2_frame_t)frame;
return NErr_Success;
}
frame = tag->FindNextFrame(frame);
}
return NErr_Empty;
}
int NSID3v2_Frame_ID_Get(nsid3v2_frame_t f, nx_string_t *owner, const void **id_data, size_t *length, int text_flags)
{
const ID3v2::Frame *frame = (const ID3v2::Frame *)f;
if (frame)
{
const void *data;
size_t data_len;
ParsedID parsed;
if (frame->GetData(&data, &data_len) == NErr_Success && data_len > 0 && ParseID(data, data_len, parsed) == NErr_Success)
{
if (owner)
{
int ret = NXStringCreateFromParsedString(owner, parsed.owner, text_flags);
if (ret != NErr_Success)
return ret;
}
*id_data = parsed.identifier_data;
*length = parsed.identifier_byte_length;
return NErr_Success;
}
}
return NErr_Empty;
}
int NSID3v2_Tag_ID_Get(const nsid3v2_tag_t t, const char *owner, const void **id_data, size_t *length, int text_flags)
{
const ID3v2::Tag *tag = (const ID3v2::Tag *)t;
if (!tag)
return NErr_Empty;
ID3v2::Frame *frame = tag->FindFirstFrame(NSID3V2_FRAME_ID);
while (frame)
{
const void *data;
size_t data_len;
ParsedID parsed;
if (frame->GetData(&data, &data_len) == NErr_Success && data_len > 0 && ParseID(data, data_len, parsed) == NErr_Success && (!owner || DescriptionMatches(parsed.owner, owner, text_flags)))
{
*id_data = parsed.identifier_data;
*length = parsed.identifier_byte_length;
return NErr_Success;
}
frame = tag->FindNextFrame(frame);
}
return NErr_Empty;
}
/* ---------------- Setters ---------------- */
int NSID3v2_Frame_ID_Set(nsid3v2_frame_t f, const char *owner, const void *id_data, size_t length, int text_flags)
{
ID3v2::Frame *frame = (ID3v2::Frame *)f;
if (frame)
{
size_t owner_length=owner?strlen(owner):0;
/* TODO: overflow check */
size_t total_size = owner_length + 1 + length;
void *data;
size_t data_len;
int ret = frame->NewData(total_size, &data, &data_len);
if (ret != NErr_Success)
return ret;
bytewriter_s byte_writer;
bytewriter_init(&byte_writer, data, data_len);
bytewriter_write_n(&byte_writer, owner, owner_length);
bytewriter_write_u8(&byte_writer, 0); // write null terminator separately, in case owner is NULL
bytewriter_write_n(&byte_writer, id_data, length);
return NErr_Success;
}
return NErr_Empty;
}
int NSID3v2_Tag_ID_Set(nsid3v2_tag_t t, const char *owner, const void *id_data, size_t length, int text_flags)
{
ID3v2::Tag *tag = (ID3v2::Tag *)t;
if (!tag)
return NErr_Empty;
ID3v2::Frame *frame = tag->FindFirstFrame(NSID3V2_FRAME_ID);
while (frame)
{
const void *data;
size_t data_len;
ParsedID parsed;
if (frame->GetData(&data, &data_len) == NErr_Success && data_len > 0 && ParseID(data, data_len, parsed) == NErr_Success && (!owner || DescriptionMatches(parsed.owner, owner, text_flags)))
{
break;
}
frame = tag->FindNextFrame(frame);
}
if (!frame)
{
frame = tag->NewFrame(NSID3V2_FRAME_ID, 0);
if (!frame)
return NErr_OutOfMemory;
tag->AddFrame(frame);
}
return NSID3v2_Frame_ID_Set((nsid3v2_frame_t)frame, owner, id_data, length, text_flags);
}
|
