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
|
#include "nsid3v2.h"
#include "nsid3v2/header.h"
#include "nsid3v2/tag.h"
#include "nsid3v2/frame_utils.h"
#include "nu/AutoWide.h"
#include "nx/nxstring.h"
#include "nu/ByteWriter.h"
struct ParsedComments
{
char language[3];
ParsedString description;
ParsedString value;
};
static int ParseComments(const void *data, size_t data_len, ParsedComments &parsed)
{
int ret;
if (data_len < 5)
return NErr_Insufficient;
bytereader_value_t byte_reader;
bytereader_init(&byte_reader, data, data_len);
// Get encoding
uint8_t encoding = bytereader_read_u8(&byte_reader);
// Get language
for (int i = 0; i < 3; i++)
parsed.language[i] = bytereader_read_u8(&byte_reader);
// Get description
ret = ParseNullTerminatedString(&byte_reader, encoding, parsed.description);
if (ret != NErr_Success)
return ret;
// Get actual text value
ret = ParseFrameTerminatedString(&byte_reader, encoding, parsed.value);
return ret;
}
int NSID3v2_Tag_Comments_Find(const nsid3v2_tag_t t, const char *description, 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_COMMENTS);
while (frame)
{
const void *data;
size_t data_len;
ParsedComments parsed;
if (frame->GetData(&data, &data_len) == NErr_Success && data_len > 0 && ParseComments(data, data_len, parsed) == NErr_Success && (!description || DescriptionMatches(parsed.description, description, text_flags)))
{
*out_frame = (nsid3v2_frame_t)frame;
return NErr_Success;
}
frame = tag->FindNextFrame(frame);
}
return NErr_Empty;
}
int NSID3v2_Tag_Comments_Get(const nsid3v2_tag_t t, const char *description, char language[3], nx_string_t *value, int text_flags)
{
const ID3v2::Tag *tag = (const ID3v2::Tag *)t;
if (!tag)
return NErr_Empty;
const ID3v2::Frame *frame = tag->FindFirstFrame(NSID3V2_FRAME_COMMENTS);
while (frame)
{
const void *data;
size_t data_len;
ParsedComments parsed;
if (frame->GetData(&data, &data_len) == NErr_Success && data_len > 0 && ParseComments(data, data_len, parsed) == NErr_Success && (!description || DescriptionMatches(parsed.description, description, text_flags)))
{
if (language)
memcpy(language, parsed.language, 3);
return NXStringCreateFromParsedString(value, parsed.value, text_flags);
}
frame = tag->FindNextFrame(frame);
}
return NErr_Empty;
}
int NSID3v2_Frame_Comments_Get(const nsid3v2_frame_t f, nx_string_t *description, char language[3], nx_string_t *value, int text_flags)
{
const ID3v2::Frame *frame = (const ID3v2::Frame *)f;
if (frame)
{
const void *data;
size_t data_len;
ParsedComments parsed;
if (frame->GetData(&data, &data_len) == NErr_Success && data_len > 0 && ParseComments(data, data_len, parsed) == NErr_Success)
{
if (language)
memcpy(language, parsed.language, 3);
int ret = NXStringCreateFromParsedString(value, parsed.value, text_flags);
if (ret != NErr_Success)
return ret;
if (description)
return NXStringCreateFromParsedString(description, parsed.description, text_flags);
else
return NErr_Success;
}
}
return NErr_Error;
}
/* ---------------- Setters ---------------- */
int NSID3v2_Frame_Comments_Set(nsid3v2_frame_t f, const char *description, const char language[3], nx_string_t value, int text_flags)
{
ID3v2::Frame *frame = (ID3v2::Frame *)f;
if (frame)
{
/* benski> for now, we're going to store UTF-16LE always. in the future, we'll add functions to NXString to determine a 'best' encoding */
size_t description_length=description?strlen(description):0;
size_t byte_count_value=0;
int ret = NXStringGetBytesSize(&byte_count_value, value, nx_charset_utf16le, 0);
if (ret != NErr_DirectPointer && ret != NErr_Success)
return ret;
/* TODO: overflow check */
size_t total_size = 1 /* encoding */ + 3 /* language */ + 2 /* BOM for description */ + description_length*2 + 2 /* null separator */ + 2 /* BOM for value */ + byte_count_value;
void *data;
size_t data_len;
ret = frame->NewData(total_size, &data, &data_len);
if (ret != NErr_Success)
return ret;
size_t bytes_copied;
bytewriter_s byte_writer;
bytewriter_init(&byte_writer, data, data_len);
bytewriter_write_u8(&byte_writer, 1); /* mark as UTF-16LE */
if (language)
bytewriter_write_n(&byte_writer, language, 3);
else
bytewriter_write_zero_n(&byte_writer, 3);
bytewriter_write_u16_le(&byte_writer, 0xFEFF); /* BOM for description */
for (size_t i=0;i<description_length;i++)
bytewriter_write_u16_le(&byte_writer, description[i]);
bytewriter_write_u16_le(&byte_writer, 0); /* NULL separator*/
bytewriter_write_u16_le(&byte_writer, 0xFEFF); /* BOM for value */
NXStringGetBytes(&bytes_copied, value, bytewriter_pointer(&byte_writer), bytewriter_size(&byte_writer), nx_charset_utf16le, 0);
return NErr_Success;
}
return NErr_Error;
}
int NSID3v2_Tag_Comments_Set(nsid3v2_tag_t t, const char *description, const char language[3], nx_string_t value, int text_flags)
{
ID3v2::Tag *tag = (ID3v2::Tag *)t;
if (!tag)
return NErr_Empty;
ID3v2::Frame *frame = tag->FindFirstFrame(NSID3V2_FRAME_COMMENTS);
while (frame)
{
const void *data;
size_t data_len;
ParsedComments parsed;
if (frame->GetData(&data, &data_len) == NErr_Success && data_len > 0 && ParseComments(data, data_len, parsed) == NErr_Success && (!description || DescriptionMatches(parsed.description, description, text_flags)))
{
break;
}
frame = tag->FindNextFrame(frame);
}
if (!frame)
{
frame = tag->NewFrame(NSID3V2_FRAME_COMMENTS, 0);
if (!frame)
return NErr_OutOfMemory;
tag->AddFrame(frame);
}
return NSID3v2_Frame_Comments_Set((nsid3v2_frame_t)frame, description, language, value, text_flags);
}
|
