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/*
* Copyright 2003-2017 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 "fs/Path.hxx"
#include "fs/FileInfo.hxx"
#include "fs/io/FileReader.hxx"
#include "system/FileDescriptor.hxx"
#include "util/RuntimeError.hxx"
#include <sys/stat.h>
#include <fcntl.h>
class FileInputStream final : public InputStream {
FileReader reader;
public:
FileInputStream(const char *path, FileReader &&_reader, off_t _size,
Mutex &_mutex)
:InputStream(path, _mutex),
reader(std::move(_reader)) {
size = _size;
seekable = true;
SetReady();
}
/* virtual methods from InputStream */
bool IsEOF() noexcept override {
return GetOffset() >= GetSize();
}
size_t Read(void *ptr, size_t size) override;
void Seek(offset_type offset) override;
};
InputStreamPtr
OpenFileInputStream(Path path, Mutex &mutex)
{
FileReader reader(path);
const FileInfo info = reader.GetFileInfo();
if (!info.IsRegular())
throw FormatRuntimeError("Not a regular file: %s",
path.c_str());
#ifdef POSIX_FADV_SEQUENTIAL
posix_fadvise(reader.GetFD().Get(), (off_t)0, info.GetSize(),
POSIX_FADV_SEQUENTIAL);
#endif
return std::make_unique<FileInputStream>(path.ToUTF8Throw().c_str(),
std::move(reader), info.GetSize(),
mutex);
}
void
FileInputStream::Seek(offset_type new_offset)
{
{
const ScopeUnlock unlock(mutex);
reader.Seek((off_t)new_offset);
}
offset = new_offset;
}
size_t
FileInputStream::Read(void *ptr, size_t read_size)
{
size_t nbytes;
{
const ScopeUnlock unlock(mutex);
nbytes = reader.Read(ptr, read_size);
}
offset += nbytes;
return nbytes;
}
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