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/*
* Copyright (C) 2003-2015 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/Path.hxx"
#include "fs/FileInfo.hxx"
#include "fs/io/FileReader.hxx"
#include "system/FileDescriptor.hxx"
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
static constexpr Domain file_domain("file");
class FileInputStream final : public InputStream {
FileReader reader;
public:
FileInputStream(const char *path, FileReader &&_reader, off_t _size,
Mutex &_mutex, Cond &_cond)
:InputStream(path, _mutex, _cond),
reader(std::move(_reader)) {
size = _size;
seekable = true;
SetReady();
}
/* 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, Error &error) override;
};
InputStream *
OpenFileInputStream(Path path,
Mutex &mutex, Cond &cond,
Error &error)
{
FileReader reader(path, error);
if (!reader.IsDefined())
return nullptr;
FileInfo info;
if (!reader.GetFileInfo(info, error))
return nullptr;
if (!info.IsRegular()) {
error.Format(file_domain, "Not a regular file: %s",
path.c_str());
return nullptr;
}
#ifdef POSIX_FADV_SEQUENTIAL
posix_fadvise(reader.GetFD().Get(), (off_t)0, info.GetSize(),
POSIX_FADV_SEQUENTIAL);
#endif
return new FileInputStream(path.ToUTF8().c_str(),
std::move(reader), info.GetSize(),
mutex, cond);
}
static InputStream *
input_file_open(gcc_unused const char *filename,
gcc_unused Mutex &mutex, gcc_unused Cond &cond,
gcc_unused Error &error)
{
/* dummy method; use OpenFileInputStream() instead */
return nullptr;
}
bool
FileInputStream::Seek(offset_type new_offset, Error &error)
{
if (!reader.Seek((off_t)new_offset, error))
return false;
offset = new_offset;
return true;
}
size_t
FileInputStream::Read(void *ptr, size_t read_size, Error &error)
{
ssize_t nbytes = reader.Read(ptr, read_size, error);
if (nbytes < 0)
return 0;
offset += nbytes;
return (size_t)nbytes;
}
const InputPlugin input_plugin_file = {
"file",
nullptr,
nullptr,
input_file_open,
};
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