Initial checkin. SimulatedStream implementation that takes a single

offset and length. Will be used for data streams embedded in icbs.
Mostly complete, completely untested.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@5698 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/apps/bin/makeudfimage/EmbeddedStream.cpp

@@ -0,0 +1,51 @@
+//----------------------------------------------------------------------
+//  This software is part of the OpenBeOS distribution and is covered 
+//  by the OpenBeOS license.
+//
+//  Copyright (c) 2003 Tyler Dauwalder, [email protected]
+//----------------------------------------------------------------------
+
+/*! \file EmbeddedStream.cpp
+*/
+
+#include "EmbeddedStream.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+EmbeddedStream::EmbeddedStream(DataStream &stream, off_t offset, size_t size)
+	: SimulatedStream(stream)
+	, fOffset(offset)
+	, fSize(size)
+{
+}
+
+/*! \brief Returns the largest extent in the underlying data stream
+	corresponding to the extent starting at byte position \a pos of
+	byte length \a size in the output parameter \a extent.
+	
+	NOTE: If the position is at or beyond the end of the stream, the
+	function will return B_OK, but the value of extent.size will be 0.
+*/
+status_t
+EmbeddedStream::_GetExtent(off_t pos, size_t size, data_extent &extent)
+{
+	if (pos >= fSize) {
+		// end of stream
+		extent.offset = fOffset + fSize;
+		extent.size = 0;
+	} else {
+		// valid position
+		extent.offset = fOffset + pos;
+		extent.size = fSize - pos;
+	}
+	return B_OK;
+}	
+
+/*! \brief Returns the current size of the stream.
+*/
+off_t
+EmbeddedStream::_Size()
+{
+	return fSize;
+}

src/apps/bin/makeudfimage/EmbeddedStream.h

@@ -0,0 +1,32 @@
+//----------------------------------------------------------------------
+//  This software is part of the OpenBeOS distribution and is covered 
+//  by the OpenBeOS license.
+//
+//  Copyright (c) 2003 Tyler Dauwalder, [email protected]
+//----------------------------------------------------------------------
+
+/*! \file EmbeddedStream.h
+*/
+
+#ifndef _EMBEDDED_STREAM_H
+#define _EMBEDDED_STREAM_H
+
+#include "SimulatedStream.h"
+
+/*! \brief AbstractExtentStream implementation that takes a single, 
+	not-neccessarily-block-aligned extent.
+*/
+class EmbeddedStream : public SimulatedStream {
+public:
+	EmbeddedStream(DataStream &stream, off_t offset, size_t size);
+
+protected:
+	virtual status_t _GetExtent(off_t pos, size_t size, data_extent &extent);
+	virtual off_t _Size();
+
+private:
+	off_t fOffset;
+	size_t fSize;
+};
+
+#endif	// _EMBEDDED_STREAM_H