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engines/grim/update/mscab.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 MSCAB_H
+#define MSCAB_H
+
+#include "common/hashmap.h"
+#include "common/hash-str.h"
+#include "common/stream.h"
+#include "common/archive.h"
+#include "common/str.h"
+#include "common/util.h"
+
+namespace Grim {
+
+class MsCabinet : public Common::Archive {
+public:
+	MsCabinet(Common::SeekableReadStream *data);
+	~MsCabinet();
+
+	// Common::Archive API implementation
+	bool hasFile(const Common::Path &path) const override;
+	int listMembers(Common::ArchiveMemberList &list) const override;
+	const Common::ArchiveMemberPtr getMember(const Common::Path &path) const override;
+	Common::SeekableReadStream *createReadStreamForMember(const Common::Path &path) const override;
+
+private:
+	Common::SeekableReadStream *_data;
+
+	struct FolderEntry {
+		uint16 comp_type;           // The compression type
+		uint16 num_blocks;          // The total number of data blocks used by this folder
+		uint32 offset;              // The cabinet offset of first datablock
+	};
+
+	struct FileEntry {
+		uint32 length;              // Uncompressed size of the file in bytes
+		FolderEntry *folder;        // Folder holding this file
+		uint32 folderOffset;        // Uncompressed offset in the folder
+	};
+
+	typedef Common::HashMap<Common::Path, FileEntry, Common::Path::IgnoreCase_Hash, Common::Path::IgnoreCase_EqualTo> FileMap;
+	FileMap _fileMap;
+
+	typedef Common::HashMap<uint16, FolderEntry> FolderMap;
+	FolderMap _folderMap;
+
+	Common::String readString(Common::ReadStream *stream);
+
+	// Decompressor
+	class Decompressor {
+	public:
+		Decompressor(const FolderEntry *folder, Common::SeekableReadStream *_data);
+		~Decompressor();
+		bool decompressFile(byte *&fileBuf, const FileEntry &entry);
+		const FolderEntry *getFolder() const {
+			return _curFolder;
+		}
+	private:
+		Common::SeekableReadStream *_data;
+		const FolderEntry *_curFolder;
+		int16 _curBlock;
+		byte *_compressedBlock, *_decompressedBlock;
+		byte *_fileBuf;
+		uint16 _startBlock, _inBlockStart, _endBlock, _inBlockEnd;
+
+		void copyBlock(byte *&data_ptr) const;
+
+		enum {
+			kMszipCompression = 1,
+			kCabBlockSize = 0x8000,
+			kCabInputmax = kCabBlockSize + 12
+		};
+	};
+
+	mutable Decompressor *_decompressor;
+
+	// Cache
+	typedef Common::HashMap<Common::Path, byte *, Common::Path::IgnoreCase_Hash, Common::Path::IgnoreCase_EqualTo> CacheMap;
+	mutable CacheMap _cache;
+};
+
+} // End of namespace Grim
+
+#endif