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engines/zvision/file/zfs_archive.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 ZVISION_ZFS_ARCHIVE_H
+#define ZVISION_ZFS_ARCHIVE_H
+
+#include "common/archive.h"
+#include "common/hashmap.h"
+#include "common/hash-str.h"
+
+namespace Common {
+class String;
+}
+
+namespace ZVision {
+
+struct ZfsHeader {
+	uint32 magic;
+	uint32 unknown1;
+	uint32 maxNameLength;
+	uint32 filesPerBlock;
+	uint32 fileCount;
+	uint8 xorKey[4];
+	uint32 fileSectionOffset;
+};
+
+struct ZfsEntryHeader {
+	Common::String name;
+	uint32 offset;
+	uint32 id;
+	uint32 size;
+	uint32 time;
+	uint32 unknown;
+};
+
+typedef Common::HashMap<Common::String, ZfsEntryHeader *, Common::IgnoreCase_Hash, Common::IgnoreCase_EqualTo> ZfsEntryHeaderMap;
+
+class ZfsArchive : public Common::Archive {
+public:
+	ZfsArchive(const Common::Path &fileName);
+	ZfsArchive(const Common::Path &fileName, Common::SeekableReadStream *stream);
+	~ZfsArchive() override;
+
+	/**
+	 * Check if a member with the given name is present in the Archive.
+	 * Patterns are not allowed, as this is meant to be a quick File::exists()
+	 * replacement.
+	 */
+	bool hasFile(const Common::Path &path) const override;
+
+	/**
+	 * Add all members of the Archive to list.
+	 * Must only append to list, and not remove elements from it.
+	 *
+	 * @return    The number of names added to list
+	 */
+	int listMembers(Common::ArchiveMemberList &list) const override;
+
+	/**
+	 * Returns a ArchiveMember representation of the given file.
+	 */
+	const Common::ArchiveMemberPtr getMember(const Common::Path &path) const override;
+
+	/**
+	 * Create a stream bound to a member with the specified name in the
+	 * archive. If no member with this name exists, 0 is returned.
+	 *
+	 * @return    The newly created input stream
+	 */
+	Common::SeekableReadStream *createReadStreamForMember(const Common::Path &path) const override;
+
+private:
+	const Common::Path _fileName;
+	ZfsHeader _header;
+	ZfsEntryHeaderMap _entryHeaders;
+
+	/**
+	 * Parses the zfs file into file entry headers that can be used later
+	 * to get the entry data.
+	 *
+	 * @param stream    The contents of the zfs file
+	 */
+	void readHeaders(Common::SeekableReadStream *stream);
+
+	/**
+	 * Entry names are contained within a 16 byte block. This reads the block
+	 * and converts it the name to a Common::String
+	 *
+	 * @param stream    The zfs file stream
+	 * @return          The entry file name
+	 */
+	Common::String readEntryName(Common::SeekableReadStream *stream) const;
+
+	/**
+	 * ZFS file entries can be encrypted using XOR encoding. This method
+	 * decodes the buffer in place using the supplied xorKey.
+	 *
+	 * @param buffer    The data to decode
+	 * @param length    Length of buffer
+	 */
+	void unXor(byte *buffer, uint32 length, const byte *xorKey) const;
+};
+
+} // End of namespace ZVision
+
+#endif