Devin J. Pohly
98 lines
2.9 KiB
C++
98 lines
2.9 KiB
C++
#include "global.h"
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#include "RageFileDriverSlice.h"
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RageFileDriverSlice::RageFileDriverSlice( RageFileBasic *pFile, int iOffset, int iFileSize )
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{
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m_pFile = pFile;
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m_iOffset = iOffset;
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m_iFileSize = iFileSize;
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m_iFilePos = 0;
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m_bFileOwned = false;
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}
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RageFileDriverSlice::RageFileDriverSlice( const RageFileDriverSlice &cpy ):
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RageFileObj(cpy)
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{
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m_pFile = cpy.m_pFile->Copy();
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m_iOffset = cpy.m_iOffset;
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m_iFileSize = cpy.m_iFileSize;
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m_iFilePos = cpy.m_iFilePos;
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m_bFileOwned = true;
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}
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RageFileDriverSlice::~RageFileDriverSlice()
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{
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if( m_bFileOwned )
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delete m_pFile;
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}
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RageFileDriverSlice *RageFileDriverSlice::Copy() const
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{
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RageFileDriverSlice *pRet = new RageFileDriverSlice( *this );
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return pRet;
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}
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int RageFileDriverSlice::ReadInternal( void *buf, size_t bytes )
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{
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/* Make sure we're reading from the right place. We might have been constructed
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* with a file not pointing to iOffset. */
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m_pFile->Seek( m_iFilePos+m_iOffset );
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const int bytes_left = m_iFileSize-this->m_iFilePos;
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const int got = m_pFile->Read( buf, min( (int) bytes, bytes_left ) );
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if( got == -1 )
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{
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SetError( m_pFile->GetError() );
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return -1;
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}
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m_iFilePos += got;
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return got;
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}
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int RageFileDriverSlice::SeekInternal( int offset )
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{
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ASSERT( offset >= 0 );
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offset = min( offset, m_iFileSize );
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int ret = m_pFile->Seek( m_iOffset + offset );
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if( ret == -1 )
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{
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SetError( m_pFile->GetError() );
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return -1;
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}
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ret -= m_iOffset;
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ASSERT( ret >= 0 );
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m_iFilePos = ret;
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return ret;
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}
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/*
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* Copyright (c) 2003-2004 Glenn Maynard
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* All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, and/or sell copies of the Software, and to permit persons to
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* whom the Software is furnished to do so, provided that the above
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* copyright notice(s) and this permission notice appear in all copies of
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* the Software and that both the above copyright notice(s) and this
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* permission notice appear in supporting documentation.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF
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* THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR HOLDERS
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* INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL INDIRECT
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* OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
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* OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
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* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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