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
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
|
#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 ParsedPicture
{
ParsedString mime;
uint8_t picture_type;
ParsedString description;
const void *picture_data;
size_t picture_byte_length;
};
static int ParsePicture(const void *data, size_t data_len, ParsedPicture &parsed)
{
int ret;
if (data_len < 4)
return NErr_NeedMoreData;
bytereader_value_t byte_reader;
bytereader_init(&byte_reader, data, data_len);
uint8_t encoding = bytereader_read_u8(&byte_reader);
/* mime type is always latin-1 */
ret = ParseNullTerminatedString(&byte_reader, 0, parsed.mime);
if (ret != NErr_Success)
return ret;
if (bytereader_size(&byte_reader) < 2)
return NErr_NeedMoreData;
parsed.picture_type = bytereader_read_u8(&byte_reader);
ret = ParseNullTerminatedString(&byte_reader, encoding, parsed.description);
if (ret != NErr_Success)
return ret;
parsed.picture_data = bytereader_pointer(&byte_reader);
parsed.picture_byte_length = bytereader_size(&byte_reader);
return NErr_Success;
}
static int ParsePicturev2_2(const void *data, size_t data_len, ParsedPicture &parsed)
{
int ret;
if (data_len < 6)
return NErr_NeedMoreData;
bytereader_value_t byte_reader;
bytereader_init(&byte_reader, data, data_len);
uint8_t encoding = bytereader_read_u8(&byte_reader);
/* three byte "Image Format" field */
parsed.mime.encoding = 0;
parsed.mime.data = bytereader_pointer(&byte_reader);
parsed.mime.byte_length = 3;
bytereader_advance(&byte_reader, 3);
parsed.picture_type = bytereader_read_u8(&byte_reader);
ret = ParseNullTerminatedString(&byte_reader, encoding, parsed.description);
if (ret != NErr_Success)
return ret;
parsed.picture_data = bytereader_pointer(&byte_reader);
parsed.picture_byte_length = bytereader_size(&byte_reader);
return NErr_Success;
}
int NSID3v2_Frame_Picture_Get(const nsid3v2_frame_t f, nx_string_t *mime, uint8_t *picture_type, nx_string_t *description, const void **picture_data, size_t *length, int text_flags)
{
const ID3v2::Frame *frame = (const ID3v2::Frame *)f;
if (frame)
{
const void *data;
size_t data_len;
ParsedPicture parsed;
if (frame->GetData(&data, &data_len) == NErr_Success && data_len > 0)
{
int ret;
if (frame->GetVersion() == 2)
ret = ParsePicturev2_2(data, data_len, parsed);
else
ret = ParsePicture(data, data_len, parsed);
if (ret == NErr_Success)
{
int ret;
if (mime)
{
ret = NXStringCreateFromParsedString(mime, parsed.mime, text_flags);
if (ret != NErr_Success)
return ret;
}
if (description)
{
ret = NXStringCreateFromParsedString(description, parsed.description, text_flags);
if (ret != NErr_Success)
return ret;
}
if (picture_type)
*picture_type = parsed.picture_type;
if (picture_data)
*picture_data = parsed.picture_data;
if (length)
*length = parsed.picture_byte_length;
return NErr_Success;
}
else
{
return ret;
}
}
}
return NErr_Empty;
}
/* ---------------- Setters ---------------- */
static const char *GetMIME2_2(nx_string_t mime)
{
if (!mime)
return "\0\0\0";
if (NXStringKeywordCompareWithCString(mime, "image/jpeg") == NErr_True || NXStringKeywordCompareWithCString(mime, "image/jpg") == NErr_True)
return "JPG";
if (NXStringKeywordCompareWithCString(mime, "image/png") == NErr_True)
return "PNG";
if (NXStringKeywordCompareWithCString(mime, "image/gif") == NErr_True)
return "GIF";
if (NXStringKeywordCompareWithCString(mime, "image/bmp") == NErr_True)
return "BMP";
return "\0\0\0";
}
int NSID3v2_Frame_Picture_Set(nsid3v2_frame_t f, nx_string_t mime, uint8_t picture_type, nx_string_t description, const void *picture_data, size_t length, int text_flags)
{
ID3v2::Frame *frame = (ID3v2::Frame *)f;
if (frame)
{
if (frame->GetVersion() == 2)
{
/* first, we need to get the total encoded size */
size_t byte_count_description=0;
if (description)
{
int ret = NXStringGetBytesSize(&byte_count_description, description, nx_charset_latin1, 0);
if (ret != NErr_DirectPointer && ret != NErr_Success)
return ret;
}
size_t total_size = 1 /* text encoding */
+ 3 /* Image Format is 3 bytes in ID3v2.2*/
+ 1 /* picture type */
+ byte_count_description + 1 /* description + null terminator */
+ length; /* picture length */
void *data;
size_t data_size;
int ret = frame->NewData(total_size, &data, &data_size);
if (ret != NErr_Success)
return ret;
size_t bytes_copied;
bytewriter_s byte_writer;
bytewriter_init(&byte_writer, data, data_size);
bytewriter_write_u8(&byte_writer, 0); /* mark as Latin-1 */
bytewriter_write_n(&byte_writer, GetMIME2_2(mime), 3);
bytewriter_write_u8(&byte_writer, picture_type);
if (description)
{
NXStringGetBytes(&bytes_copied, description, bytewriter_pointer(&byte_writer), bytewriter_size(&byte_writer), nx_charset_latin1, 0);
bytewriter_advance(&byte_writer, bytes_copied);
}
bytewriter_write_u8(&byte_writer, 0); /* description null terminator */
bytewriter_write_n(&byte_writer, picture_data, length);
return NErr_Success;
}
else
{
/* first, we need to get the total encoded size */
size_t byte_count_mime=0;
if (mime)
{
int ret = NXStringGetBytesSize(&byte_count_mime, mime, nx_charset_latin1, 0);
if (ret != NErr_DirectPointer && ret != NErr_Success)
return ret;
}
size_t byte_count_description=0;
if (description)
{
int ret = NXStringGetBytesSize(&byte_count_description, description, nx_charset_latin1, 0);
if (ret != NErr_DirectPointer && ret != NErr_Success)
return ret;
}
size_t total_size = 1 /* text encoding */
+ byte_count_mime + 1 /* mime + null terminator */
+ 1 /* picture type */
+ byte_count_description + 1 /* description + null terminator */
+ length; /* picture length */
void *data;
size_t data_size;
int ret = frame->NewData(total_size, &data, &data_size);
if (ret != NErr_Success)
return ret;
size_t bytes_copied;
bytewriter_s byte_writer;
bytewriter_init(&byte_writer, data, data_size);
bytewriter_write_u8(&byte_writer, 0); /* mark as Latin-1 */
if (mime)
{
NXStringGetBytes(&bytes_copied, mime, bytewriter_pointer(&byte_writer), bytewriter_size(&byte_writer), nx_charset_latin1, 0);
bytewriter_advance(&byte_writer, bytes_copied);
}
bytewriter_write_u8(&byte_writer, 0); /* MIME null terminator */
bytewriter_write_u8(&byte_writer, picture_type);
if (description)
{
NXStringGetBytes(&bytes_copied, description, bytewriter_pointer(&byte_writer), bytewriter_size(&byte_writer), nx_charset_latin1, 0);
bytewriter_advance(&byte_writer, bytes_copied);
}
bytewriter_write_u8(&byte_writer, 0); /* description null terminator */
bytewriter_write_n(&byte_writer, picture_data, length);
return NErr_Success;
}
}
return NErr_Empty;
}
|
