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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.
*
*/
/*
* This code is based on original Sfinx source code
* Copyright (c) 1994-1997 Janus B. Wisniewski and L.K. Avalon
*/
#ifndef CGE2_FILEIO_H
#define CGE2_FILEIO_H
#include "common/file.h"
namespace CGE2 {
class CGE2Engine;
#define kBtSize 2048
#define kBtKeySize 13
#define kBtLevel 2
#define kBtInnerCount ((kBtSize - 4 /*sizeof(Header) */) / (kBtKeySize + 2 /*sizeof(Inner) */))
#define kBtLeafCount ((kBtSize - 4 /*sizeof(Header) */) / (kBtKeySize + 4 + 4 /*sizeof(BtKeypack) */))
#define kBtValNone 0xFFFF
#define kBtValRoot 0
#define kCatName "VOL.CAT"
#define kDatName "VOL.DAT"
#define kCryptSeed 0xA5
struct BtKeypack {
char _key[kBtKeySize];
uint32 _pos;
uint32 _size;
};
struct Inner {
uint8 _key[kBtKeySize];
uint16 _down;
};
struct Header {
uint16 _count;
uint16 _down;
};
struct BtPage {
Header _header;
union {
// dummy filler to make proper size of union
uint8 _data[kBtSize - 4]; /* 4 is the size of struct Header */
// inner version of data: key + word-sized page link
Inner _inner[kBtInnerCount];
// leaf version of data: key + all user data
BtKeypack _leaf[kBtLeafCount];
};
void readBTree(Common::ReadStream &s);
};
class ResourceManager {
private:
struct {
BtPage *_page;
uint16 _pageNo;
int _index;
} _buff[kBtLevel];
BtPage *getPage(int level, uint16 pageId);
uint16 catRead(byte *buf, uint16 length);
Common::File *_catFile;
Common::File *_datFile;
void XCrypt(byte *buf, uint16 length);
public:
ResourceManager();
~ResourceManager();
uint16 read(byte *buf, uint16 length);
bool seek(int32 offs, int whence = SEEK_SET);
BtKeypack *find(const char *key);
bool exist(const char *name);
};
class EncryptedStream {
private:
CGE2Engine *_vm;
Common::SeekableReadStream *_readStream;
const char **_tab;
int _lineCount;
bool _error;
static const char *kIdTab[];
public:
EncryptedStream(CGE2Engine *vm, const char *name);
~EncryptedStream();
bool err();
bool eos();
bool seek(int32 offset);
int32 pos();
int32 size();
uint32 read(byte *dataPtr, uint32 dataSize);
Common::String readLine();
static int number(char *s);
static char *token(char *s);
int getLineCount() { return _lineCount; }
};
} // End of namespace CGE2
#endif // CGE2_FILEIO_H
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