scummvm/engines/hugo/file_v1w.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.
 *
 */

/*
 * This code is based on original Hugo Trilogy source code
 *
 * Copyright (c) 1989-1995 David P. Gray
 *
 */

#include "common/debug.h"
#include "common/system.h"
#include "common/textconsole.h"

#include "hugo/hugo.h"
#include "hugo/file.h"
#include "hugo/util.h"

namespace Hugo {
FileManager_v1w::FileManager_v1w(HugoEngine *vm) : FileManager_v2w(vm) {
}

FileManager_v1w::~FileManager_v1w() {
}

/**
 * Open and read in an overlay file, close file
 */
void FileManager_v1w::readOverlay(const int screenNum, ImagePtr image, OvlType overlayType) {
	debugC(1, kDebugFile, "readOverlay(%d, ...)", screenNum);

	ImagePtr tmpImage = image;                      // temp ptr to overlay file
	_sceneryArchive1.seek((uint32)screenNum * sizeof(SceneBlock), SEEK_SET);

	SceneBlock sceneBlock;                          // Database header entry
	sceneBlock._sceneOffset = _sceneryArchive1.readUint32LE();
	sceneBlock._sceneLength = _sceneryArchive1.readUint32LE();
	sceneBlock._boundaryOffset = _sceneryArchive1.readUint32LE();
	sceneBlock._boundaryLength = _sceneryArchive1.readUint32LE();
	sceneBlock._overlayOffset = _sceneryArchive1.readUint32LE();
	sceneBlock._overlayLength = _sceneryArchive1.readUint32LE();
	sceneBlock._baseOffset = _sceneryArchive1.readUint32LE();
	sceneBlock._baseLength = _sceneryArchive1.readUint32LE();

	uint32 i = 0;
	switch (overlayType) {
	case kOvlBoundary:
		_sceneryArchive1.seek(sceneBlock._boundaryOffset, SEEK_SET);
		i = sceneBlock._boundaryLength;
		break;
	case kOvlOverlay:
		_sceneryArchive1.seek(sceneBlock._overlayOffset, SEEK_SET);
		i = sceneBlock._overlayLength;
		break;
	case kOvlBase:
		_sceneryArchive1.seek(sceneBlock._baseOffset, SEEK_SET);
		i = sceneBlock._baseLength;
		break;
	default:
		error("Bad overlayType: %d", overlayType);
		break;
	}
	if (i == 0) {
		memset(image, 0, kOvlSize);
		return;
	}
	_sceneryArchive1.read(tmpImage, kOvlSize);
}

} // End of namespace Hugo