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engines/dgds/resource.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 DGDS_RESOURCE_H
+#define DGDS_RESOURCE_H
+
+#include "common/file.h"
+#include "common/hashmap.h"
+#include "common/platform.h"
+
+namespace Dgds {
+
+class Decompressor;
+
+typedef uint32 DGDS_ID;
+typedef uint32 DGDS_EX;
+#define DGDS_TYPENAME_MAX 4
+
+struct Resource {
+	byte volume;
+	uint32 pos;
+	uint32 size;
+	uint32 checksum;
+};
+
+typedef Common::HashMap<Common::String, Resource> ResourceList;
+
+#define MAX_VOLUMES 10
+
+class ResourceManager {
+public:
+	ResourceManager(const char *dir = "");
+	virtual ~ResourceManager();
+
+	Common::SeekableReadStream *getResource(Common::String name, bool ignorePatches = false);
+	Resource getResourceInfo(Common::String name);
+	bool hasResource(Common::String name) const;
+
+	const ResourceList &getResources() const { return _resources; }
+
+private:
+	Common::File _volumes[MAX_VOLUMES];
+	ResourceList _resources;
+};
+
+class DgdsChunkReader {
+public:
+	DgdsChunkReader(Common::SeekableReadStream *stream);
+	~DgdsChunkReader();
+
+	bool isSection(const Common::String &section) const;
+	bool isSection(DGDS_ID section) const;
+
+	bool readNextHeader(DGDS_EX ex, const Common::String &filename);
+
+	/// Get a stream of the (decompressed if appropriate) content.
+	/// This stream is owned by this object and invalidated when
+	/// another header or content block is read. Do not delete it.
+	bool readContent(Decompressor *decompressor);
+
+	/// Don't bother reading the current chunk, just move to the
+	/// next one. This is the alternative to readContent().
+	void skipContent();
+
+	/// Duplicate the buffer in the current content stream so
+	/// that it can be retained in another object.
+	Common::SeekableReadStream *makeMemoryStream();
+
+	Common::SeekableReadStream *getContent() { return _contentStream; }
+
+	bool isContainer() const { return _container; }
+	DGDS_ID getId() const { return _id; }
+	const char *getIdStr() const { return _idStr; }
+	uint32 getSize() const { return _size; }
+
+	DGDS_EX _ex;
+
+private:
+	uint32 _size;
+	uint64 _startPos;
+	char _idStr[DGDS_TYPENAME_MAX + 1];
+	DGDS_ID _id;
+	bool _container;
+	Common::SeekableReadStream *_contentStream;
+	Common::SeekableReadStream *_sourceStream;
+
+	bool isPacked() const;
+	Common::SeekableReadStream *decodeStream(Decompressor *decompressor);
+	Common::SeekableReadStream *readStream();
+};
+
+} // End of namespace Dgds
+
+#endif // DGDS_RESOURCE_H