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
|
/*
* Copyright (C) 2003-2009 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 "input/file_input_plugin.h"
#include "input_plugin.h"
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <glib.h>
#undef G_LOG_DOMAIN
#define G_LOG_DOMAIN "input_file"
static bool
input_file_open(struct input_stream *is, const char *filename)
{
int fd, ret;
struct stat st;
char* pathname = g_strdup(filename);
if (!g_path_is_absolute(filename))
{
g_free(pathname);
return false;
}
if (stat(filename, &st) < 0) {
char* slash = strrchr(pathname, '/');
*slash = '\0';
}
fd = open(pathname, O_RDONLY);
if (fd < 0) {
is->error = errno;
g_debug("Failed to open \"%s\": %s",
pathname, g_strerror(errno));
g_free(pathname);
return false;
}
is->seekable = true;
ret = fstat(fd, &st);
if (ret < 0) {
is->error = errno;
close(fd);
g_free(pathname);
return false;
}
if (!S_ISREG(st.st_mode)) {
g_debug("Not a regular file: %s", pathname);
is->error = EINVAL;
close(fd);
g_free(pathname);
return false;
}
is->size = st.st_size;
#ifdef POSIX_FADV_SEQUENTIAL
posix_fadvise(fd, (off_t)0, is->size, POSIX_FADV_SEQUENTIAL);
#endif
is->plugin = &input_plugin_file;
is->data = GINT_TO_POINTER(fd);
is->ready = true;
g_free(pathname);
return true;
}
static bool
input_file_seek(struct input_stream *is, goffset offset, int whence)
{
int fd = GPOINTER_TO_INT(is->data);
offset = (goffset)lseek(fd, (off_t)offset, whence);
if (offset < 0) {
is->error = errno;
return false;
}
is->offset = offset;
return true;
}
static size_t
input_file_read(struct input_stream *is, void *ptr, size_t size)
{
int fd = GPOINTER_TO_INT(is->data);
ssize_t nbytes;
nbytes = read(fd, ptr, size);
if (nbytes < 0) {
is->error = errno;
g_debug("input_file_read: error reading: %s\n",
strerror(is->error));
return 0;
}
is->offset += nbytes;
return (size_t)nbytes;
}
static void
input_file_close(struct input_stream *is)
{
int fd = GPOINTER_TO_INT(is->data);
close(fd);
}
static bool
input_file_eof(struct input_stream *is)
{
return is->offset >= is->size;
}
const struct input_plugin input_plugin_file = {
.name = "file",
.open = input_file_open,
.close = input_file_close,
.read = input_file_read,
.eof = input_file_eof,
.seek = input_file_seek,
};
|
