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engines/titanic/true_talk/dialogue_file.h

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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/>.
+ *
+ */
+
+#ifndef TITANIC_DIALOGUE_FILE_H
+#define TITANIC_DIALOGUE_FILE_H
+
+#include "titanic/support/simple_file.h"
+#include "titanic/support/string.h"
+
+namespace Titanic {
+
+struct DialogueIndexEntry {
+	uint _v1, _offset;
+
+	DialogueIndexEntry() : _v1(0), _offset(0) {}
+	void load(Common::SeekableReadStream &s);
+};
+
+struct DialogueResource {
+	bool _active;
+	uint _offset, _bytesRead, _size;
+	DialogueIndexEntry *_entryPtr;
+
+	DialogueResource() : _active(false), _offset(0),
+		_bytesRead(0), _size(0), _entryPtr(nullptr) {}
+
+	/**
+	 * Return the size of a cache entry
+	 */
+	size_t size() const { return _active ? _size : 0; }
+};
+
+class CDialogueFile {
+private:
+	File _file;
+	Common::Array<DialogueIndexEntry> _index;
+	Common::Array<DialogueResource> _cache;
+private:
+	/**
+	 * Add a dialogue file entry to the active cache
+	 */
+	DialogueResource *addToCache(int index);
+public:
+	CDialogueFile(const CString &filename, uint count);
+	~CDialogueFile();
+
+	/**
+	 * Clear the loaded data
+	 */
+	void clear();
+
+	File *getFile() { return &_file; }
+
+	/**
+	 * Sets up a text entry within the dialogue file for access
+	 */
+	DialogueResource *openTextEntry(int index) {
+		return addToCache(index * 2);
+	}
+
+	/**
+	 * Sets up a wave (sound) entry within the dialogue file for access
+	 */
+	DialogueResource *openWaveEntry(int index) {
+		return addToCache(index * 2 + 1);
+	}
+
+	/**
+	 * Removes an entry from the cache
+	 */
+	bool closeEntry(DialogueResource *cacheEntry);
+
+	/**
+	 * Read data for a resource
+	 */
+	bool read(DialogueResource *cacheEntry, byte *buffer, size_t bytesToRead);
+};
+
+} // End of namespace Titanic
+
+#endif /* TITANIC_TITLE_ENGINE_H */