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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.
*
* $URL$
* $Id$
*
*/
#include "scumm/smush/chunk.h"
#include "scumm/scumm.h"
#include "scumm/file.h"
#include "common/file.h"
#include "common/str.h"
#include "common/util.h"
namespace Scumm {
bool Chunk::seek(int32 delta, int dir) {
switch (dir) {
case SEEK_CUR:
_curPos += delta;
break;
case SEEK_SET:
if (delta < 0)
error("invalid seek request");
_curPos = (uint32)delta;
break;
case SEEK_END:
if (delta > 0 || _size < (uint32)-delta)
error("invalid seek request");
_curPos = (uint32)(_size + delta);
break;
default:
break;
}
if (_curPos > _size) {
// It may happen that user misused our SAN compression tool
// and ignored FLU index for videos which are used by INSANE.
// This will lead to incorrect seek requests
//
// In fact it may happen only within INSANE, so do not even check for it
warning("Looks like you compressed file %s in wrong way. It has FLU index which was not updated", _name.c_str());
error("invalid seek request : %d > %d (delta == %d)", _curPos, _size, delta);
}
return true;
}
Chunk::Chunk(BaseScummFile *data, int offset)
: _type(0), _size(0), _curPos(0) {
_data = data;
_deleteData = false;
_data->seek(offset, SEEK_SET);
_type = _data->readUint32BE();
_size = _data->readUint32BE();
_offset = _data->pos();
_curPos = 0;
}
Chunk::Chunk(const Common::String &name, int offset)
: _type(0), _size(0), _curPos(0) {
_data = new ScummFile();
_deleteData = true;
if (!g_scumm->openFile(*_data, name))
error("Chunk: Unable to open file %s", name.c_str());
_data->seek(offset, SEEK_SET);
_type = _data->readUint32BE();
_size = _data->readUint32BE();
_offset = _data->pos();
_curPos = 0;
_name = name;
}
Chunk::~Chunk() {
if (_deleteData)
delete _data;
}
Chunk *Chunk::subBlock() {
Chunk *ptr = new Chunk(_data, _offset + _curPos);
skip(sizeof(Chunk::type) + sizeof(uint32) + ptr->size());
return ptr;
}
void Chunk::reseek() {
_data->seek(_offset + _curPos, SEEK_SET);
}
uint32 Chunk::read(void *buffer, uint32 dataSize) {
if (dataSize <= 0 || (_curPos + dataSize) > _size)
error("invalid buffer read request");
dataSize = _data->read(buffer, dataSize);
_curPos += dataSize;
return dataSize;
}
} // End of namespace Scumm
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