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Mainly, for HTTP which might be stalled trying to connect (especially if you're not near your PC right now and it's in your recent, for example.)
73 lines
2.0 KiB
C++
73 lines
2.0 KiB
C++
// Copyright (c) 2015- PPSSPP Project.
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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, version 2.0 or later versions.
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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 2.0 for more details.
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// A copy of the GPL 2.0 should have been included with the program.
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// If not, see http://www.gnu.org/licenses/
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// Official git repository and contact information can be found at
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// https://github.com/hrydgard/ppsspp and http://www.ppsspp.org/.
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#pragma once
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#include <vector>
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#include <mutex>
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#include "Common/CommonTypes.h"
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#include "Core/Loaders.h"
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class RamCachingFileLoader : public FileLoader {
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public:
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RamCachingFileLoader(FileLoader *backend);
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~RamCachingFileLoader() override;
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bool Exists() override;
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bool ExistsFast() override;
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bool IsDirectory() override;
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s64 FileSize() override;
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std::string Path() const override;
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size_t ReadAt(s64 absolutePos, size_t bytes, size_t count, void *data, Flags flags = Flags::NONE) override {
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return ReadAt(absolutePos, bytes * count, data, flags) / bytes;
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}
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size_t ReadAt(s64 absolutePos, size_t bytes, void *data, Flags flags = Flags::NONE) override;
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void Cancel() override;
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private:
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void InitCache();
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void ShutdownCache();
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size_t ReadFromCache(s64 pos, size_t bytes, void *data);
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// Guaranteed to read at least one block into the cache.
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void SaveIntoCache(s64 pos, size_t bytes, Flags flags);
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void StartReadAhead(s64 pos);
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u32 NextAheadBlock();
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enum {
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BLOCK_SIZE = 65536,
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BLOCK_SHIFT = 16,
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MAX_BLOCKS_PER_READ = 16,
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BLOCK_READAHEAD = 4,
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};
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s64 filesize_ = 0;
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FileLoader *backend_;
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u8 *cache_ = nullptr;
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int exists_ = -1;
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int isDirectory_ = -1;
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std::vector<u8> blocks_;
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std::mutex blocksMutex_;
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u32 aheadRemaining_;
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s64 aheadPos_;
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bool aheadThread_ = false;
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bool aheadCancel_ = false;
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};
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