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/*
* 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 final : public InputStream {
int fd;
FileInputStream(const char *path, int _fd, off_t _size,
Mutex &_mutex, Cond &_cond)
:InputStream(input_plugin_file, path, _mutex, _cond),
fd(_fd) {
size = _size;
seekable = true;
SetReady();
}
~FileInputStream() {
close(fd);
}
/* virtual methods from InputStream */
bool IsEOF() override {
return GetOffset() >= GetSize();
}
size_t Read(void *ptr, size_t size, Error &error) override;
bool Seek(offset_type offset, int whence, Error &error) override;
};
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
return new FileInputStream(filename, fd, st.st_size, mutex, cond);
}
bool
FileInputStream::Seek(InputPlugin::offset_type new_offset, int whence,
Error &error)
{
new_offset = (InputPlugin::offset_type)lseek(fd, (off_t)new_offset,
whence);
if (new_offset < 0) {
error.SetErrno("Failed to seek");
return false;
}
offset = new_offset;
return true;
}
size_t
FileInputStream::Read(void *ptr, size_t read_size, Error &error)
{
ssize_t nbytes = read(fd, ptr, read_size);
if (nbytes < 0) {
error.SetErrno("Failed to read");
return 0;
}
offset += nbytes;
return (size_t)nbytes;
}
const InputPlugin input_plugin_file = {
"file",
nullptr,
nullptr,
input_file_open,
};
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