ce49d99c2f
Since we switched from autotools to Meson in commit
94592c1406, we don't need to include
`config.h` early to properly enable large file support. Meson passes
the required macros on the compiler command line instead of defining
them in `config.h`.
This means we can include `config.h` at any time, whenever we want to
check its macros, and there are no ordering constraints.
110 lines
3.0 KiB
C++
110 lines
3.0 KiB
C++
/*
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* Copyright 2003-2018 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_BUFFERED_INPUT_STREAM_BUFFER_HXX
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#define MPD_BUFFERED_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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#include <assert.h>
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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"; see IsEligible() for details.
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*/
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class BufferedInputStream final : public InputStream, InputStreamHandler {
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InputStreamPtr input;
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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, idle = false;
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offset_type seek_offset;
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std::exception_ptr read_error, seek_error;
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// TODO: make configurable
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static constexpr offset_type MAX_SIZE = 128 * 1024 * 1024;
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public:
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BufferedInputStream(InputStreamPtr _input);
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~BufferedInputStream() noexcept override;
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/**
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* Check whether the given #InputStream can be used as input
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* for this class.
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*/
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static bool IsEligible(const InputStream &input) noexcept {
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assert(input.IsReady());
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return input.IsSeekable() && input.KnownSize() &&
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input.GetSize() > 0 &&
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input.GetSize() <= MAX_SIZE;
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}
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/* virtual methods from class InputStream */
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void Check() override;
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/* we don't need to implement Update() because all attributes
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have been copied already in our constructor */
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//void Update() noexcept;
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void Seek(offset_type offset) override;
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bool IsEOF() noexcept override;
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/* we don't support tags */
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// std::unique_ptr<Tag> ReadTag() override;
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bool IsAvailable() noexcept override;
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size_t Read(void *ptr, size_t size) override;
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/* virtual methods from class InputStreamHandler */
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void OnInputStreamReady() noexcept override {
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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 override {
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wake_cond.signal();
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}
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private:
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void RunThread() noexcept;
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};
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#endif
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