ee5b68f1fc
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.)
84 lines
2.3 KiB
C++
84 lines
2.3 KiB
C++
// Copyright (c) 2012- 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 <map>
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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 CachingFileLoader : public FileLoader {
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public:
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CachingFileLoader(FileLoader *backend);
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~CachingFileLoader() 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 Prepare();
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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, bool readingAhead = false);
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bool MakeCacheSpaceFor(size_t blocks, bool readingAhead);
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void StartReadAhead(s64 pos);
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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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MAX_BLOCKS_CACHED = 4096, // 256 MB
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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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int exists_ = -1;
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int isDirectory_ = -1;
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u64 generation_;
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u64 oldestGeneration_;
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size_t cacheSize_;
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struct BlockInfo {
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u8 *ptr;
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u64 generation;
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BlockInfo() : ptr(nullptr), generation(0) {
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}
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BlockInfo(u8 *p) : ptr(p), generation(0) {
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}
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};
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std::map<s64, BlockInfo> blocks_;
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std::recursive_mutex blocksMutex_;
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bool aheadThread_ = false;
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std::once_flag preparedFlag_;
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};
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