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67 lines
2.0 KiB
C
67 lines
2.0 KiB
C
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// Copyright (C) 2003 Dolphin 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.
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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 SVN repository and contact information can be found at
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// http://code.google.com/p/dolphin-emu/
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#ifndef _LINEAR_DISKCACHE
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#define _LINEAR_DISKCACHE
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#include "Common.h"
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#include <stdlib.h>
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#include <stdio.h>
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// On disk format:
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// uint32 'DCAC'
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// uint32 version; // svn_rev
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// uint32 key_length;
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// uint32 value_length;
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// .... key;
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// .... value;
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class LinearDiskCacheReader {
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public:
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virtual void Read(const u8 *key, int key_size, const u8 *value, int value_size) = 0;
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};
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// Dead simple unsorted key-value store with append functionality.
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// No random read functionality, all reading is done in OpenAndRead.
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// Keys and values can contain any characters, including \0.
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//
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// Suitable for caching generated shader bytecode between executions.
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// Not tuned for extreme performance but should be reasonably fast.
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// Does not support keys or values larger than 2GB, which should be reasonable.
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// Keys must have non-zero length; values can have zero length.
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class LinearDiskCache {
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public:
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LinearDiskCache();
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// Returns the number of items read from the cache.
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int OpenAndRead(const char *filename, LinearDiskCacheReader *reader);
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void Close();
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void Sync();
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// Appends a key-value pair to the store.
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void Append(const u8 *key, int key_size, const u8 *value, int value_size);
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private:
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void WriteHeader();
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bool ValidateHeader();
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FILE *file_;
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int num_entries_;
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};
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#endif // _LINEAR_DISKCACHE
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