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/* 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.
*
*/
#include "glk/quetzal.h"
#include "common/memstream.h"
namespace Glk {
void QuetzalReader::clear() {
_chunks.clear();
_stream = nullptr;
}
bool QuetzalReader::open(Common::SeekableReadStream *stream, uint32 formType) {
clear();
stream->seek(0);
_stream = stream;
if (stream->readUint32BE() != ID_FORM)
return false;
uint32 size = stream->readUint32BE();
uint32 fileFormType = stream->readUint32BE();
if (formType != ID_IFSF && fileFormType != formType)
return false;
if ((int)size > stream->size() || (size & 1) || (size < 4))
return false;
size -= 4;
// Iterate through reading chunk headers
while (size > 0) {
if (size < 8)
// Couldn't contain a chunk
return false;
// Get in the chunk header
Chunk c;
c._id = stream->readUint32BE();
c._size = stream->readUint32BE();
c._offset = stream->pos();
_chunks.push_back(c);
int chunkRemainder = c._size + (c._size & 1);
if ((stream->pos() + chunkRemainder) > stream->size())
// Chunk goes beyond the file size
return false;
size -= 8 + chunkRemainder;
stream->skip(chunkRemainder);
}
return true;
}
/*--------------------------------------------------------------------------*/
Common::WriteStream &QuetzalWriter::add(uint32 chunkId) {
// Sanity check to prevent adding the same chunk multiple times
for (uint idx = 0; idx < _chunks.size(); ++idx) {
if (_chunks[idx]._id == chunkId)
error("Duplicate chunk added");
}
_chunks.push_back(Chunk(chunkId));
return _chunks.back()._stream;
}
void QuetzalWriter::save(Common::WriteStream *out, uint32 formType) {
// Calculate the size of the chunks
uint size = 4;
for (uint idx = 0; idx < _chunks.size(); ++idx)
size += 8 + _chunks[idx]._stream.size() + (_chunks[idx]._stream.size() & 1);
// Write out the header
out->writeUint32BE(ID_FORM);
out->writeUint32BE(size);
out->writeUint32BE(formType);
// Loop through writing the chunks
for (uint idx = 0; idx < _chunks.size(); ++idx) {
Common::MemoryWriteStreamDynamic &s = _chunks[idx]._stream;
out->writeUint32BE(_chunks[idx]._id);
out->writeUint32BE(s.size());
out->write(s.getData(), s.size());
if (s.size() & 1)
out->writeByte(0);
}
}
} // End of namespace Glk
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