Initial commit

engines/kyra/resource/resource_segacd.cpp

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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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifdef ENABLE_EOB
+
+#include "kyra/resource/resource.h"
+#include "kyra/resource/resource_intern.h"
+#include "kyra/resource/resource_segacd.h"
+#include "common/substream.h"
+
+namespace Kyra {
+
+SegaCDResource::SegaCDResource(Resource *res) : _res(res), _str(0), _resTable(0), _numResources(0), _curOffset(0), _curSize(0) {
+}
+
+SegaCDResource::~SegaCDResource() {
+	unloadContainer();
+}
+
+bool SegaCDResource::loadContainer(const Common::Path &filename, uint32 offset, uint32 size) {
+	if (_curFile.equals(filename) && _curOffset == offset && _curSize == size)
+		return true;
+
+	unloadContainer();
+
+	_str = _res->createEndianAwareReadStream(filename);
+	if (!_str) {
+		error("SegaCDResource: File '%s' not found.", filename.toString().c_str());
+		return false;
+	}
+
+	_str->seek(offset, SEEK_SET);
+	uint32 first = _str->readUint32();
+	_numResources = first >> 2;
+
+	if (_numResources & 0xFFFF0000) {
+		_curFile.clear();
+		_numResources = 0;
+		return false;
+	}
+
+	for (int i = 1; i < _numResources; ++i) {
+		uint32 next = _str->readUint32();
+		if (next == 0) {
+			_numResources = i;
+		} else if (next < first) {
+			first = next;
+			_numResources = first >> 2;
+		}
+	}
+
+	_str->seek(offset, SEEK_SET);
+	_resTable = new TableEntry[_numResources];
+	for (int i = 0; i < _numResources; ++i)
+		_resTable[i]._offset = offset + _str->readUint32();
+
+	if (size)
+		assert(offset + size <= (uint32)_str->size());
+
+	for (int i = 0; i < _numResources; ++i) {
+		uint32 next = size ? offset + size : _str->size();
+		for (int ii = 0; ii < _numResources; ++ii) {
+			if (_resTable[ii]._offset <= _resTable[i]._offset)
+				continue;
+			next = MIN<uint32>(_resTable[ii]._offset, next);
+		}
+		_resTable[i]._len = next - _resTable[i]._offset;
+	}
+
+	_curFile = filename;
+	_curOffset = offset;
+	_curSize = size;
+
+	return true;
+}
+
+void SegaCDResource::unloadContainer() {
+	delete[] _resTable;
+	delete _str;
+	_resTable = 0;
+	_numResources = 0;
+	_str = 0;
+}
+
+Common::SeekableReadStreamEndian *SegaCDResource::resStreamEndian(int resID) {
+	if (!_str || !_resTable || resID >= _numResources)
+		return 0;
+
+	Common::SeekableReadStream *str = resStream(resID);
+	if (!str)
+		return 0;
+
+	return new Common::SeekableReadStreamEndianWrapper(str, _str->isBE(), DisposeAfterUse::YES);
+}
+
+Common::SeekableReadStream *SegaCDResource::resStream(int resID) {
+	if (!_str || !_resTable || resID >= _numResources)
+		return 0;
+
+	return new Common::SeekableSubReadStream(_str, _resTable[resID]._offset, _resTable[resID]._offset + _resTable[resID]._len, DisposeAfterUse::NO);
+}
+
+uint8 *SegaCDResource::resData(int resID, uint32 *resLen) {
+	if (!_str || !_resTable || resID >= _numResources)
+		return 0;
+
+	uint8 *res = new uint8[_resTable[resID]._len];
+
+	_str->seek(_resTable[resID]._offset, SEEK_SET);
+	_str->read(res, _resTable[resID]._len);
+
+	if (resLen)
+		*resLen = _resTable[resID]._len;
+
+	return res;
+}
+
+} // End of namespace Kyra
+
+#endif // ENABLE_EOB