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utils/dx_proxy/filememcache.h

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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//
+//=============================================================================//
+
+#ifndef FILEMEMCACHE_H
+#define FILEMEMCACHE_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+#include "tier0/platform.h"
+#include "tier1/generichash.h"
+#include <unordered_map>
+
+#pragma warning ( disable : 4200 )
+
+class CachedFileData
+{
+	friend class FileCache;
+
+protected: // Constructed by FileCache
+	CachedFileData() {}
+	static CachedFileData *Create( char const *szFilename );
+	void Free( void );
+
+public:
+	static CachedFileData *GetByDataPtr( void const *pvDataPtr );
+	
+	char const * GetFileName() const;
+	void const * GetDataPtr() const;
+	int GetDataLen() const;
+
+	int UpdateRefCount( int iDeltaRefCount ) { return m_numRefs += iDeltaRefCount; }
+
+	bool IsValid() const;
+
+protected:
+	enum { eHeaderSize = 256 };
+	char m_chFilename[256 - 12];
+	int m_numRefs;
+	int m_numDataBytes;
+	int m_signature;
+	unsigned char m_data[0]; // file data spans further
+};
+
+class FileCache
+{
+public:
+	FileCache();
+	~FileCache() { Clear(); }
+
+public:
+	CachedFileData *Get( char const *szFilename );
+	void Clear( void );
+
+protected:
+	struct eqstr {
+		inline size_t operator()( const char *s ) const {
+			if ( !s )
+				return 0;
+			return HashString( s );
+		}
+		inline bool operator()( const char *s1, const char *s2 ) const {
+			return _stricmp( s1, s2 ) < 0;
+		}
+	};
+
+	typedef std::unordered_map< const char *, CachedFileData *, eqstr, eqstr > Mapping;
+	Mapping m_map;
+};
+
+#endif // #ifndef FILEMEMCACHE_H