zfs_archive.h

/* 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;

    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:
    const Common::Path _fileName;
    ZfsHeader _header;
    ZfsEntryHeaderMap _entryHeaders;

    void readHeaders(Common::SeekableReadStream *stream);

    Common::String readEntryName(Common::SeekableReadStream *stream) const;

    void unXor(byte *buffer, uint32 length, const byte *xorKey) const;
};

} // End of namespace ZVision

#endif