110 lines
2.7 KiB
C++
110 lines
2.7 KiB
C++
/*
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* Copyright 2003-2020 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "FileInputPlugin.hxx"
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#include "../InputStream.hxx"
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#include "fs/Path.hxx"
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#include "fs/FileInfo.hxx"
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#include "fs/io/FileReader.hxx"
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#include "io/FileDescriptor.hxx"
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#include "util/RuntimeError.hxx"
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#include <cinttypes> // for PRIu64 (PRIoffset)
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#include <sys/stat.h>
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#include <fcntl.h>
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class FileInputStream final : public InputStream {
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FileReader reader;
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public:
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FileInputStream(const char *path, FileReader &&_reader, off_t _size,
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Mutex &_mutex)
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:InputStream(path, _mutex),
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reader(std::move(_reader)) {
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size = _size;
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seekable = true;
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SetReady();
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}
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/* virtual methods from InputStream */
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[[nodiscard]] bool IsEOF() const noexcept override {
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return GetOffset() >= GetSize();
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}
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size_t Read(std::unique_lock<Mutex> &lock,
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void *ptr, size_t size) override;
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void Seek(std::unique_lock<Mutex> &lock,
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offset_type offset) override;
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};
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InputStreamPtr
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OpenFileInputStream(Path path, Mutex &mutex)
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{
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FileReader reader(path);
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const FileInfo info = reader.GetFileInfo();
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if (!info.IsRegular())
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throw FormatRuntimeError("Not a regular file: %s",
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path.c_str());
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#ifdef POSIX_FADV_SEQUENTIAL
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posix_fadvise(reader.GetFD().Get(), (off_t)0, info.GetSize(),
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POSIX_FADV_SEQUENTIAL);
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#endif
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return std::make_unique<FileInputStream>(path.ToUTF8Throw().c_str(),
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std::move(reader), info.GetSize(),
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mutex);
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}
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void
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FileInputStream::Seek(std::unique_lock<Mutex> &,
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offset_type new_offset)
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{
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{
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const ScopeUnlock unlock(mutex);
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reader.Seek((off_t)new_offset);
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}
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offset = new_offset;
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}
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size_t
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FileInputStream::Read(std::unique_lock<Mutex> &,
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void *ptr, size_t read_size)
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{
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size_t nbytes;
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{
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const ScopeUnlock unlock(mutex);
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nbytes = reader.Read(ptr, read_size);
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}
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if (nbytes == 0 && !IsEOF())
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throw FormatRuntimeError("Unexpected end of file %s"
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" at %" PRIoffset " of %" PRIoffset,
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GetURI(), GetOffset(), GetSize());
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offset += nbytes;
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return nbytes;
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}
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