Merging r5975 through r6036 from trunk to ogl-es branch.

GLES drivers adapted, but only did make compile-tests.


git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/branches/ogl-es@6038 dfc29bdd-3216-0410-991c-e03cc46cb475

include/IReadFile.h

@@ -0,0 +1,61 @@
+// Copyright (C) 2002-2012 Nikolaus Gebhardt
+// This file is part of the "Irrlicht Engine".
+// For conditions of distribution and use, see copyright notice in irrlicht.h
+
+#ifndef __I_READ_FILE_H_INCLUDED__
+#define __I_READ_FILE_H_INCLUDED__
+
+#include "IReferenceCounted.h"
+#include "coreutil.h"
+#include "EReadFileType.h"
+
+namespace irr
+{
+namespace io
+{
+
+	//! Interface providing read access to a file.
+	class IReadFile : public virtual IReferenceCounted
+	{
+	public:
+		//! Reads an amount of bytes from the file.
+		/** \param buffer Pointer to buffer where read bytes are written to.
+		\param sizeToRead Amount of bytes to read from the file.
+		\return How many bytes were read. */
+		virtual size_t read(void* buffer, size_t sizeToRead) = 0;
+
+		//! Changes position in file
+		/** \param finalPos Destination position in the file.
+		\param relativeMovement If set to true, the position in the file is
+		changed relative to current position. Otherwise the position is changed
+		from beginning of file.
+		\return True if successful, otherwise false. */
+		virtual bool seek(long finalPos, bool relativeMovement = false) = 0;
+
+		//! Get size of file.
+		/** \return Size of the file in bytes. */
+		virtual long getSize() const = 0;
+
+		//! Get the current position in the file.
+		/** \return Current position in the file in bytes on success or -1L on failure. */
+		virtual long getPos() const = 0;
+
+		//! Get name of file.
+		/** \return File name as zero terminated character string. */
+		virtual const io::path& getFileName() const = 0;
+
+		//! Get the type of the class implementing this interface
+		virtual EREAD_FILE_TYPE getType() const
+		{
+			return EFIT_UNKNOWN;
+		}
+	};
+
+	//! Internal function, please do not use.
+	IReadFile* createLimitReadFile(const io::path& fileName, IReadFile* alreadyOpenedFile, long pos, long areaSize);
+
+} // end namespace io
+} // end namespace irr
+
+#endif
+