no engine anymore

public/ifilesystem.h

@@ -0,0 +1,71 @@
+#ifndef FILESYSTEM_H
+#define FILESYSTEM_H
+
+#include "iappsystem.h"
+#include "tier0/platform.h"
+
+#define FILESYSTEM_INTERFACE_NAME "FileSystem001"
+#define FILESYSTEM_BACKEND_INTERFACE_NAME "FileSystemBackend001"
+#define FILESYSTEM_PAK_INTERFACE_NAME "FileSystemPAK001"
+
+enum EFileMode
+{
+	FILEMODE_READ = 0x01,
+	FILEMODE_WRITE = 0x02,
+	FILEMODE_APPEND = 0x04,
+};
+
+enum EFileType {
+	FILETYPE_NONE,
+	FILETYPE_SYSTEM,
+	FILETYPE_PAK,
+};
+
+enum ESeekMode
+{
+	SEEKMODE_SET,
+	SEEKMODE_RELATIVE_START,
+	SEEKMODE_RELATIVE_END,
+};
+
+abstract_class IFileSystem;
+
+class IFileHandle
+{
+public:
+	IFileSystem *m_pFileSystem;
+
+	size_t Write( const void *pData, size_t nDataSize );
+	size_t Read( void *pData, size_t nDataSize );
+	size_t Seek( ESeekMode eSeekMode, size_t nOffset );
+	size_t Tell( void );
+	void Close( void );
+
+
+};
+
+
+//----------------------------------------------------------------------------
+// IFileSystem is an app system which manages files, could have different 
+// file systems etc. Because of that there is base file system which manages 
+// others. PAK files are opened first, then mounted stuff comes second and 
+// host's system last.
+//----------------------------------------------------------------------------
+abstract_class IFileSystem: public IAppSystem
+{
+public:
+	virtual IFileHandle *Open( const char *szFileName, int eOpCode ) = 0;	
+	virtual size_t Write( IFileHandle *pFile, const void *pData, size_t nDataSize ) = 0;
+	virtual size_t Read( IFileHandle *pFile, void *pData, size_t nDataSize ) = 0;
+
+	virtual size_t Seek( IFileHandle *pFile, ESeekMode eSeekMode, size_t nOffset ) = 0;
+	virtual size_t Tell( IFileHandle *pFile ) = 0;
+
+	virtual void Close( IFileHandle *pFile ) = 0;
+};
+
+extern IFileSystem *filesystem;
+extern IFileSystem *filesystem_backend;
+extern IFileSystem *filesystem_pak;
+
+#endif