Initial commit

engines/mohawk/resource_cache.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/>.
+ *
+ */
+
+#include "common/debug.h"
+#include "mohawk/myst.h"
+#include "mohawk/resource_cache.h"
+
+namespace Mohawk {
+
+ResourceCache::ResourceCache() {
+	enabled = true;
+}
+
+ResourceCache::~ResourceCache() {
+	clear();
+}
+
+void ResourceCache::clear() {
+	if (!enabled)
+		return;
+
+	debugC(kDebugCache, "Clearing Cache...");
+
+	for (uint32 i = 0; i < _store.size(); i++)
+		delete _store[i].data;
+
+	_store.clear();
+}
+
+void ResourceCache::add(uint32 tag, uint16 id, Common::SeekableReadStream *data) {
+	if (!enabled)
+		return;
+
+	debugC(kDebugCache, "Adding item %d - tag 0x%04X id %d", _store.size(), tag, id);
+
+	DataObject current;
+	current.tag = tag;
+	current.id = id;
+	uint32 dataCurPos = data->pos();
+	current.data = data->readStream(data->size());
+	data->seek(dataCurPos);
+	_store.push_back(current);
+}
+
+// Returns NULL if not found
+Common::SeekableReadStream *ResourceCache::search(uint32 tag, uint16 id) {
+	if (!enabled)
+		return nullptr;
+
+	debugC(kDebugCache, "Searching for tag 0x%04X id %d", tag, id);
+
+	for (uint32 i = 0; i < _store.size(); i++) {
+		if (tag == _store[i].tag && id == _store[i].id) {
+			debugC(kDebugCache, "Found cached tag 0x%04X id %u", tag, id);
+			uint32 dataCurPos  = _store[i].data->pos();
+			Common::SeekableReadStream *ret = _store[i].data->readStream(_store[i].data->size());
+			_store[i].data->seek(dataCurPos);
+			return ret;
+		}
+	}
+
+	debugC(kDebugCache, "tag 0x%04X id %d not found", tag, id);
+	return nullptr;
+}
+
+} // End of namespace Mohawk