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iff_container.cpp

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.

 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.

 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $URL$
 * $Id$
 *
 */

#include "common/iff_container.h"
#include "common/substream.h"

namespace Common {

IFFParser::IFFParser(Common::ReadStream *stream, bool disposeStream) : _stream(stream), _disposeStream(disposeStream) {
      setInputStream(stream);
}

IFFParser::~IFFParser() {
      if (_disposeStream) {
            delete _stream;
      }
      _stream = 0;
}

void IFFParser::setInputStream(Common::ReadStream *stream) {
      assert(stream);
      _formChunk.setInputStream(stream);
      _chunk.setInputStream(stream);

      _formChunk.readHeader();
      if (_formChunk.id != ID_FORM) {
            error("IFFParser input is not a FORM type IFF file");
      }
      _formSize = _formChunk.size;
      _formType = _formChunk.readUint32BE();
}

00055 void IFFParser::parse(IFFCallback &callback) {
      bool stop;
      do {
            _chunk.feed();
            _formChunk.incBytesRead(_chunk.size);

            if (_formChunk.hasReadAll()) {
                  break;
            }

            _formChunk.incBytesRead(8);
            _chunk.readHeader();

            // invoke the callback
            Common::SubReadStream stream(&_chunk, _chunk.size);
            IFFChunk chunk(_chunk.id, _chunk.size, &stream);
            stop = callback(chunk);

            // eats up all the remaining data in the chunk
            while (!stream.eos()) {
                  stream.readByte();
            }

      } while (!stop);
}

}     // End of namespace Common

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