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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 2
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#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;
byte 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::String &fileName);
ZfsArchive(const Common::String &fileName, Common::SeekableReadStream *stream);
~ZfsArchive();
/**
* 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::String &fileName) const;
/**
* 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;
/**
* Returns a ArchiveMember representation of the given file.
*/
const Common::ArchiveMemberPtr getMember(const Common::String &name) const;
/**
* 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::String &name) const;
private:
const Common::String _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
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