106 lines
2.6 KiB
C++
106 lines
2.6 KiB
C++
/*
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* Copyright 2003-2019 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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#ifndef MPD_BUFFERING_INPUT_STREAM_BUFFER_HXX
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#define MPD_BUFFERING_INPUT_STREAM_BUFFER_HXX
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#include "InputStream.hxx"
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#include "Ptr.hxx"
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#include "Handler.hxx"
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#include "thread/Thread.hxx"
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#include "thread/Cond.hxx"
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#include "util/SparseBuffer.hxx"
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#include <exception>
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/**
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* A "huge" buffer which remembers the (partial) contents of an
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* #InputStream. This works only if the #InputStream is a "file", not
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* a "stream".
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*/
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class BufferingInputStream : InputStreamHandler {
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InputStreamPtr input;
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Mutex &mutex;
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Thread thread;
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/**
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* This #Cond wakes up the #Thread. It is used by both the
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* "client" thread (to submit commands) and #input's handler
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* (to notify new data being available).
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*/
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Cond wake_cond;
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/**
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* This #Cond wakes up the client upon command completion.
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*/
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Cond client_cond;
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SparseBuffer<uint8_t> buffer;
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bool stop = false, seek = false;
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size_t offset = 0;
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size_t seek_offset;
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std::exception_ptr read_error, seek_error;
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static constexpr size_t INVALID_OFFSET = ~size_t(0);
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public:
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explicit BufferingInputStream(InputStreamPtr _input);
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~BufferingInputStream() noexcept;
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const auto &GetInput() const noexcept {
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return *input;
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}
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auto size() const noexcept {
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return buffer.size();
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}
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void Check();
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void Seek(std::unique_lock<Mutex> &lock, size_t new_offset);
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bool IsAvailable() noexcept;
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size_t Read(std::unique_lock<Mutex> &lock, void *ptr, size_t size);
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protected:
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virtual void OnBufferAvailable() noexcept {}
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private:
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size_t FindFirstHole() const noexcept;
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void RunThreadLocked(std::unique_lock<Mutex> &lock) noexcept;
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void RunThread() noexcept;
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/* virtual methods from class InputStreamHandler */
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void OnInputStreamReady() noexcept final {
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/* this should never be called, because our input must
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be "ready" already */
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}
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void OnInputStreamAvailable() noexcept final {
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wake_cond.notify_one();
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}
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};
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#endif
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