blob: 21e09d377c1759a14f5af426d3862e2ea329567c (
plain) (
blame)
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
|
#include "util.h"
uint32_t ID3v2::Util::Int28To32(uint32_t val)
{
// TODO: big endian safe?
uint32_t ret;
ret = (val & 0x7FU);
val >>= 1;
ret |= (val & 0x3F80U);
val >>= 1;
ret |= (val & 0x1FC000U);
val >>= 1;
ret |= (val & 0xFE00000U);
return ret;
/*
uint8_t *bytes = (uint8_t *)&ret;
const uint8_t *value = (const uint8_t *)&val;
ret = (value[0] << 21) + (value[1] << 14) + (value[2] << 7) + (value[3]);
// for (size_t i=0;i<sizeof(uint32_t);i++ )
// value[sizeof(uint32_t)-1-i]=(uint8_t)(val>>(i*8)) & 0xFF;
return ret;
*/
}
uint32_t ID3v2::Util::Int32To28(uint32_t val)
{
// TODO: big endian safe?
uint32_t ret;
ret = (val & 0x7FU);
ret |= (val & 0x3F80U) << 1;
ret |= (val & 0x1FC000U) << 2;
ret |= (val & 0xFE00000U) << 3;
return ret;
}
size_t ID3v2::Util::UnsynchroniseTo(void *_output, const void *_input, size_t bytes)
{
uint8_t *output = (uint8_t *)_output;
const uint8_t *input = (const uint8_t *)_input;
size_t bytes_read = 0;
while (bytes)
{
if (input[0] == 0xFF && input[1] == 0)
{
*output++ = 0xFF;
input+=2;
bytes_read+=2;
bytes--;
}
else
{
*output++=*input++;
bytes_read++;
bytes--;
}
}
return bytes_read;
}
size_t ID3v2::Util::UnsynchronisedInputSize(const void *data, size_t output_bytes)
{
const uint8_t *input = (const uint8_t *)data;
size_t bytes_read = 0;
while (output_bytes)
{
if (input[0] == 0xFF && input[1] == 0)
{
input+=2;
bytes_read+=2;
output_bytes--;
}
else
{
input++;
bytes_read++;
output_bytes--;
}
}
return bytes_read;
}
size_t ID3v2::Util::UnsynchronisedOutputSize(const void *data, size_t input_bytes)
{
const uint8_t *input = (const uint8_t *)data;
size_t bytes_written = 0;
while (input_bytes)
{
if (input[0] == 0xFF && input_bytes > 1 && input[1] == 0)
{
input+=2;
bytes_written++;
input_bytes-=2;
}
else
{
input++;
bytes_written++;
input_bytes--;
}
}
return bytes_written;
}
// returns output bytes used
size_t ID3v2::Util::SynchroniseTo(void *_output, const void *data, size_t bytes)
{
uint8_t *output = (uint8_t *)_output;
const uint8_t *input = (const uint8_t *)data;
size_t bytes_needed = 0;
while (bytes)
{
*output++=*input;
bytes_needed++;
if (*input++ == 0xFF)
{
if (bytes == 1)
{
// if this is the last byte, we need to make room for an extra 0
*output = 0;
return bytes_needed + 1;
}
else if ((*input & 0xE0) == 0xE0 || *input == 0)
{
*output++ = 0;
bytes_needed++;
}
}
bytes--;
}
return bytes_needed;
}
size_t ID3v2::Util::SynchronisedSize(const void *data, size_t bytes)
{
const uint8_t *input = (const uint8_t *)data;
size_t bytes_needed = 0;
while (bytes)
{
bytes_needed++;
if (*input++ == 0xFF)
{
if (bytes == 1)
{
// if this is the last byte, we need to make room for an extra 0
return bytes_needed + 1;
}
else if ((*input & 0xE0) == 0xE0 || *input == 0)
{
bytes_needed++;
}
}
bytes--;
}
return bytes_needed;
}
|
