//---------------------------------------------------------------------- // This software is part of the OpenBeOS distribution and is covered // by the OpenBeOS license. // // Copyright (c) 2003 Tyler Dauwalder, tyler@dauwalder.net //---------------------------------------------------------------------- /*! \file EmbeddedStream.cpp */ #include "EmbeddedStream.h" #include #include 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; }