It is accomplished ...

git-svn-id: file:///srv/svn/repos/haiku/trunk/current@10 a95241bf-73f2-0310-859d-f6bbb57e9c96
2002-07-09 12:24:59 +00:00
commit 52a3801208
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+//----------------------------------------------------------------------
+//  This software is part of the OpenBeOS distribution and is covered 
+//  by the OpenBeOS license.
+//---------------------------------------------------------------------
+/*!
+	\file OffsetFile.h
+	OffsetFile interface declaration.
+*/
+
+#ifndef _sk_offset_file_h_
+#define _sk_offset_file_h_
+
+#include <DataIO.h>
+#include <File.h>
+
+namespace StorageKit {
+
+/*!
+	\class OffsetFile
+	\brief Provides access to a file skipping a certain amount of bytes at
+	the beginning.
+	
+	This class implements the BPositionIO interface to provide access to the
+	data of a file past a certain offset. This is very handy e.g. for dealing
+	with resources, as they always reside at the end of a file, but may start
+	at arbitrary offsets.
+
+	\author <a href='mailto:[email protected]'>Ingo Weinhold</a>
+	
+	\version 0.0.0
+*/
+class OffsetFile : public BPositionIO {
+public:
+	OffsetFile();
+	OffsetFile(BFile *file, off_t offset);
+	virtual ~OffsetFile();
+
+	status_t SetTo(BFile *file, off_t offset);
+	void Unset();
+	status_t InitCheck() const;
+
+	BFile *File() const;
+
+	ssize_t ReadAt(off_t pos, void *buffer, size_t size);
+	ssize_t WriteAt(off_t pos, const void *buffer,
+								size_t size);
+	off_t Seek(off_t position, uint32 seekMode);
+	off_t Position() const;
+
+	status_t SetSize(off_t size);
+	status_t GetSize(off_t *size);
+
+	off_t Offset() const;
+
+private:
+	BFile*				fFile;
+	off_t				fOffset;
+	off_t				fCurrentPosition;
+};
+
+};	// namespace StorageKit
+
+#endif	// _sk_offset_file_h_