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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 Soltys source code
* Copyright (c) 1994-1995 Janus B. Wisniewski and L.K. Avalon
*/
#ifndef __CGE_FILEIO__
#define __CGE_FILEIO__
#include "cge/general.h"
#include "common/stream.h"
namespace CGE {
#define kBtSize 1024
#define kBtKeySize 13
#define kBtLevel 2
#define kBtInnerCount ((kBtSize - 4 /*sizeof(Hea) */) / (kBtKeySize + 2 /*sizeof(Inner) */))
#define kBtLeafCount ((kBtSize - 4 /*sizeof(Hea) */) / (kBtKeySize + 4 + 2 /*sizeof(BtKeypack) */))
#define kBtValNone 0xFFFF
#define kBtValRoot 0
#define kLineMaxSize 512
#define kBufferSize 2048
#define kCatName "VOL.CAT"
#define kDatName "VOL.DAT"
struct BtKeypack {
char _key[kBtKeySize];
uint32 _mark;
uint16 _size;
};
struct Inner {
uint8 _key[kBtKeySize];
uint16 _down;
};
struct Hea {
uint16 _count;
uint16 _down;
};
class XFile {
public:
uint16 _error;
XFile() : _error(0) { }
virtual ~XFile() { }
virtual uint16 read(void *buf, uint16 len) = 0;
virtual long mark() = 0;
virtual long size() = 0;
virtual long seek(long pos) = 0;
};
class IoHand : public XFile {
protected:
Common::File *_file;
uint16 _seed;
Crypt *_crypt;
public:
IoHand(const char *name, Crypt crypt);
IoHand(Crypt *crypt);
virtual ~IoHand();
static bool exist(const char *name);
uint16 read(void *buf, uint16 len);
long mark();
long size();
long seek(long pos);
};
class IoBuf : public IoHand {
protected:
uint8 *_buff;
uint16 _ptr;
uint16 _lim;
long _bufMark;
virtual void readBuf();
public:
IoBuf(Crypt *crpt);
IoBuf(const char *name, Crypt *crpt);
virtual ~IoBuf();
uint16 read(void *buf, uint16 len);
uint16 read(uint8 *buf);
int read();
};
class CFile : public IoBuf {
public:
static uint16 _maxLineLen;
CFile(const char *name, Crypt *crpt);
virtual ~CFile();
long mark();
long seek(long pos);
};
struct BtPage {
Hea _hea;
union {
// dummy filler to make proper size of union
uint8 _data[kBtSize - 4 /*sizeof(Hea) */];
// inner version of data: key + word-sized page link
Inner _inn[kBtInnerCount];
// leaf version of data: key + all user data
BtKeypack _lea[kBtLeafCount];
};
void read(Common::ReadStream &s);
};
class BtFile : public IoHand {
struct {
BtPage *_page;
uint16 _pgNo;
int _indx;
} _buff[kBtLevel];
BtPage *getPage(int lev, uint16 pgn);
public:
BtFile(const char *name, Crypt *crpt);
virtual ~BtFile();
BtKeypack *find(const char *key);
BtKeypack *next();
};
class Dat {
friend class VFile;
CFile _file;
public:
Dat();
bool read(long org, uint16 len, uint8 *buf);
};
class VFile : public IoBuf {
private:
static Dat *_dat;
static BtFile *_cat;
static VFile *_recent;
long _begMark;
long _endMark;
void readBuf();
public:
VFile(const char *name);
~VFile();
static void init();
static void deinit();
static bool exist(const char *name);
static const char *next();
long mark();
long size();
long seek(long pos);
};
} // End of namespace CGE
#endif
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