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/*
* Copyright (C) 2003-2010 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 "fd_util.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"
struct file_input_stream {
struct input_stream base;
int fd;
};
static inline GQuark
file_quark(void)
{
return g_quark_from_static_string("file");
}
static struct input_stream *
input_file_open(const char *filename, GError **error_r)
{
int fd, ret;
struct stat st;
struct file_input_stream *fis;
if (!g_path_is_absolute(filename))
return false;
fd = open_cloexec(filename, O_RDONLY, 0);
if (fd < 0) {
if (errno != ENOENT && errno != ENOTDIR)
g_set_error(error_r, file_quark(), errno,
"Failed to open \"%s\": %s",
filename, g_strerror(errno));
return false;
}
ret = fstat(fd, &st);
if (ret < 0) {
g_set_error(error_r, file_quark(), errno,
"Failed to stat \"%s\": %s",
filename, g_strerror(errno));
close(fd);
return false;
}
if (!S_ISREG(st.st_mode)) {
g_set_error(error_r, file_quark(), 0,
"Not a regular file: %s", filename);
close(fd);
return false;
}
#ifdef POSIX_FADV_SEQUENTIAL
posix_fadvise(fd, (off_t)0, st.st_size, POSIX_FADV_SEQUENTIAL);
#endif
fis = g_new(struct file_input_stream, 1);
input_stream_init(&fis->base, &input_plugin_file);
fis->base.size = st.st_size;
fis->base.seekable = true;
fis->base.ready = true;
fis->fd = fd;
return &fis->base;
}
static bool
input_file_seek(struct input_stream *is, goffset offset, int whence,
GError **error_r)
{
struct file_input_stream *fis = (struct file_input_stream *)is;
offset = (goffset)lseek(fis->fd, (off_t)offset, whence);
if (offset < 0) {
g_set_error(error_r, file_quark(), errno,
"Failed to seek: %s", g_strerror(errno));
return false;
}
is->offset = offset;
return true;
}
static size_t
input_file_read(struct input_stream *is, void *ptr, size_t size,
GError **error_r)
{
struct file_input_stream *fis = (struct file_input_stream *)is;
ssize_t nbytes;
nbytes = read(fis->fd, ptr, size);
if (nbytes < 0) {
g_set_error(error_r, file_quark(), errno,
"Failed to read: %s", g_strerror(errno));
return 0;
}
is->offset += nbytes;
return (size_t)nbytes;
}
static void
input_file_close(struct input_stream *is)
{
struct file_input_stream *fis = (struct file_input_stream *)is;
close(fis->fd);
input_stream_deinit(&fis->base);
g_free(fis);
}
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,
};
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