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