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
|
/*
* 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.
*/
#include "config.h" /* must be first for large file support */
#include "FileInputPlugin.hxx"
#include "../InputStream.hxx"
#include "../InputPlugin.hxx"
#include "util/Error.hxx"
#include "util/Domain.hxx"
#include "fs/Traits.hxx"
#include "system/fd_util.h"
#include "open.h"
#include <sys/stat.h>
#include <unistd.h>
#include <errno.h>
static constexpr Domain file_domain("file");
struct FileInputStream {
InputStream base;
int fd;
FileInputStream(const char *path, int _fd, off_t size,
Mutex &mutex, Cond &cond)
:base(input_plugin_file, path, mutex, cond),
fd(_fd) {
base.size = size;
base.seekable = true;
base.ready = true;
}
~FileInputStream() {
close(fd);
}
};
static InputStream *
input_file_open(const char *filename,
Mutex &mutex, Cond &cond,
Error &error)
{
int fd, ret;
struct stat st;
if (!PathTraitsFS::IsAbsolute(filename))
return nullptr;
fd = open_cloexec(filename, O_RDONLY|O_BINARY, 0);
if (fd < 0) {
if (errno != ENOENT && errno != ENOTDIR)
error.FormatErrno("Failed to open \"%s\"",
filename);
return nullptr;
}
ret = fstat(fd, &st);
if (ret < 0) {
error.FormatErrno("Failed to stat \"%s\"", filename);
close(fd);
return nullptr;
}
if (!S_ISREG(st.st_mode)) {
error.Format(file_domain, "Not a regular file: %s", filename);
close(fd);
return nullptr;
}
#ifdef POSIX_FADV_SEQUENTIAL
posix_fadvise(fd, (off_t)0, st.st_size, POSIX_FADV_SEQUENTIAL);
#endif
FileInputStream *fis = new FileInputStream(filename, fd, st.st_size,
mutex, cond);
return &fis->base;
}
static bool
input_file_seek(InputStream *is, InputPlugin::offset_type offset,
int whence,
Error &error)
{
FileInputStream *fis = (FileInputStream *)is;
offset = (InputPlugin::offset_type)lseek(fis->fd, (off_t)offset, whence);
if (offset < 0) {
error.SetErrno("Failed to seek");
return false;
}
is->offset = offset;
return true;
}
static size_t
input_file_read(InputStream *is, void *ptr, size_t size,
Error &error)
{
FileInputStream *fis = (FileInputStream *)is;
ssize_t nbytes;
nbytes = read(fis->fd, ptr, size);
if (nbytes < 0) {
error.SetErrno("Failed to read");
return 0;
}
is->offset += nbytes;
return (size_t)nbytes;
}
static void
input_file_close(InputStream *is)
{
FileInputStream *fis = (FileInputStream *)is;
delete fis;
}
static bool
input_file_eof(InputStream *is)
{
return is->offset >= is->size;
}
const InputPlugin input_plugin_file = {
"file",
nullptr,
nullptr,
input_file_open,
input_file_close,
nullptr,
nullptr,
nullptr,
nullptr,
input_file_read,
input_file_eof,
input_file_seek,
};
|
