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53 lines
1.3 KiB
C++
53 lines
1.3 KiB
C++
/* ScummVM - Scumm Interpreter
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* Copyright (C) 2002-2005 The ScummVM project
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* $Header$
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*
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*/
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#include "stdafx.h"
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#include "common/stream.h"
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namespace Common {
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void MemoryReadStream::seek(int32 offs, int whence) {
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// Pre-Condition
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assert(_pos <= _bufSize);
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switch (whence) {
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case SEEK_END:
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// SEEK_END works just like SEEK_SET, only 'reversed',
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// i.e. from the end.
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offs = _bufSize - offs;
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// Fall through
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case SEEK_SET:
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_ptr = _ptrOrig + offs;
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_pos = offs;
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break;
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case SEEK_CUR:
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_ptr += offs;
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_pos += offs;
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break;
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}
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// Post-Condition
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assert(_pos <= _bufSize);
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}
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} // End of namespace Common
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