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
|
/*
* Copyright (C) 2003-2014 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.
*/
/* \file
*
* This file contains functions used by the DSF and DSDIFF decoders.
*
*/
#include "config.h"
#include "DsdLib.hxx"
#include "../DecoderAPI.hxx"
#include "input/InputStream.hxx"
#include "tag/TagId3.hxx"
#include "util/Error.hxx"
#include <string.h>
#ifdef HAVE_ID3TAG
#include <id3tag.h>
#endif
bool
DsdId::Equals(const char *s) const
{
assert(s != nullptr);
assert(strlen(s) == sizeof(value));
return memcmp(value, s, sizeof(value)) == 0;
}
bool
dsdlib_read(Decoder *decoder, InputStream &is,
void *data, size_t length)
{
size_t nbytes = decoder_read(decoder, is, data, length);
return nbytes == length;
}
/**
* Skip the #input_stream to the specified offset.
*/
bool
dsdlib_skip_to(Decoder *decoder, InputStream &is,
int64_t offset)
{
if (is.IsSeekable())
return is.Seek(offset, IgnoreError());
if (is.GetOffset() > offset)
return false;
char buffer[8192];
while (is.GetOffset() < offset) {
size_t length = sizeof(buffer);
if (offset - is.GetOffset() < (int64_t)length)
length = offset - is.GetOffset();
size_t nbytes = decoder_read(decoder, is, buffer, length);
if (nbytes == 0)
return false;
}
assert(is.GetOffset() == offset);
return true;
}
/**
* Skip some bytes from the #input_stream.
*/
bool
dsdlib_skip(Decoder *decoder, InputStream &is,
int64_t delta)
{
assert(delta >= 0);
if (delta == 0)
return true;
if (is.IsSeekable())
return is.Seek(is.GetOffset() + delta, IgnoreError());
char buffer[8192];
while (delta > 0) {
size_t length = sizeof(buffer);
if ((int64_t)length > delta)
length = delta;
size_t nbytes = decoder_read(decoder, is, buffer, length);
if (nbytes == 0)
return false;
delta -= nbytes;
}
return true;
}
#ifdef HAVE_ID3TAG
void
dsdlib_tag_id3(InputStream &is,
const struct tag_handler *handler,
void *handler_ctx, int64_t tagoffset)
{
assert(tagoffset >= 0);
if (tagoffset == 0)
return;
if (!dsdlib_skip_to(nullptr, is, tagoffset))
return;
struct id3_tag *id3_tag = nullptr;
id3_length_t count;
/* Prevent broken files causing problems */
const auto size = is.GetSize();
const auto offset = is.GetOffset();
if (offset >= size)
return;
count = size - offset;
/* Check and limit id3 tag size to prevent a stack overflow */
if (count == 0 || count > 4096)
return;
id3_byte_t dsdid3[count];
id3_byte_t *dsdid3data;
dsdid3data = dsdid3;
if (!dsdlib_read(nullptr, is, dsdid3data, count))
return;
id3_tag = id3_tag_parse(dsdid3data, count);
if (id3_tag == nullptr)
return;
scan_id3_tag(id3_tag, handler, handler_ctx);
id3_tag_delete(id3_tag);
return;
}
#endif
|
