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/*
* Copyright (C) 2003-2013 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 (!PathTraits::IsAbsoluteFS(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,
};
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