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dos_system.h

/*
 *  Copyright (C) 2002-2004  The DOSBox Team
 *
 *  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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

/* $Id: dos_system.h,v 1.28 2004/11/13 12:08:42 qbix79 Exp $ */

#ifndef DOSSYSTEM_H_
#define DOSSYSTEM_H_

#include <string.h>
#include <vector>
#include "dosbox.h"
#include "cross.h"

#define DOS_NAMELENGTH 12
#define DOS_NAMELENGTH_ASCII (DOS_NAMELENGTH+1)
#define DOS_FCBNAME 15
#define DOS_DIRDEPTH 8
#define DOS_PATHLENGTH 80
#define DOS_TEMPSIZE 1024

enum {
      DOS_ATTR_READ_ONLY=     0x01,
      DOS_ATTR_HIDDEN=  0x02,
      DOS_ATTR_SYSTEM=  0x04,
      DOS_ATTR_VOLUME=  0x08,
      DOS_ATTR_DIRECTORY=     0x10,
      DOS_ATTR_ARCHIVE= 0x20
};

struct FileStat_Block {
      Bit32u size;
      Bit16u time;
      Bit16u date;
      Bit16u attr;
};

class DOS_DTA;

class DOS_File {
public:
      DOS_File():flags(0)           { name=0; refCtr = 0; };
      DOS_File(const DOS_File& orig);
      DOS_File & operator= (const DOS_File & orig);
      virtual     ~DOS_File(){if(name) delete [] name;};
      virtual bool      Read(Bit8u * data,Bit16u * size)=0;
      virtual bool      Write(Bit8u * data,Bit16u * size)=0;
      virtual bool      Seek(Bit32u * pos,Bit32u type)=0;
      virtual bool      Close()=0;
      virtual Bit16u    GetInformation(void)=0;
      virtual void      SetName(const char* _name)    { if (name) delete[] name; name = new char[strlen(_name)+1]; strcpy(name,_name); }
      virtual char*     GetName(void)                       { return name; };
      virtual bool      IsOpen()                            { return open; };
      virtual bool      IsName(const char* _name)     { if (!name) return false; return strcmp(name,_name)==0; };
      virtual void      AddRef()                            { refCtr++; };
      virtual Bits      RemoveRef()                         { return --refCtr; };
      virtual bool      UpdateDateTimeFromHost()      { return true; }
      Bit8u type;
      Bit32u flags;
      Bit16u time;
      Bit16u date;
      Bit16u attr;
      Bit32u size;
      Bits refCtr;
      bool open;
      char* name;
/* Some Device Specific Stuff */
};

class DOS_Device : public DOS_File {
public:
      DOS_Device(const DOS_Device& orig):DOS_File(orig) {devnum=orig.devnum; }
      DOS_Device & operator= (const DOS_Device & orig) {
            DOS_File::operator=(orig);
            devnum=orig.devnum;
            return *this;
      }
      DOS_Device():DOS_File(),devnum(0){};   
      virtual bool      Read(Bit8u * data,Bit16u * size);
      virtual bool      Write(Bit8u * data,Bit16u * size);
      virtual bool      Seek(Bit32u * pos,Bit32u type);
      virtual bool      Close();
      virtual Bit16u    GetInformation(void);   
      void SetDeviceNumber(Bitu num) { devnum=num;}
private:
      Bitu devnum;
};

#define MAX_OPENDIRS 2048
//Can be high as it's only storage (16 bit variable)
class DOS_Drive_Cache {
public:
      DOS_Drive_Cache                           (void);
      DOS_Drive_Cache                           (const char* path);
      ~DOS_Drive_Cache                    (void);

      typedef enum TDirSort { NOSORT, ALPHABETICAL, DIRALPHABETICAL, ALPHABETICALREV, DIRALPHABETICALREV };

      void        SetBaseDir              (const char* path);
      void        SetDirSort              (TDirSort sort) { sortDirType = sort; };
      bool        OpenDir                       (const char* path, Bit16u& id);
      bool        ReadDir                       (Bit16u id, char* &result);

      void        ExpandName              (char* path);
      char*       GetExpandName           (const char* path);
      bool        GetShortName            (const char* fullname, char* shortname);
      
      bool        FindFirst               (char* path, Bitu& id);
      bool        FindNext                (Bitu id, char* &result);

      void        CacheOut                (const char* path, bool ignoreLastDir = false);
      void        AddEntry                (const char* path, bool checkExist = false);
      void        DeleteEntry             (const char* path, bool ignoreLastDir = false);

      void        EmptyCache              (void);
      void        SetLabel                (const char* name,bool allowupdate=true);
      char*       GetLabel                (void) { return label; };

      class CFileInfo {
      public:     
            CFileInfo(void) {
                  orgname[0] = shortname[0] = 0;
                  nextEntry = shortNr = 0;
                  isDir = false;
            }
            ~CFileInfo(void) {
                  for (Bit32u i=0; i<fileList.size(); i++) delete fileList[i];
                  fileList.clear();
                  longNameList.clear();
            };
            char        orgname           [CROSS_LEN];
            char        shortname   [DOS_NAMELENGTH_ASCII];
            bool        isDir;
            Bitu        nextEntry;
            Bitu        shortNr;
            // contents
            std::vector<CFileInfo*> fileList;
            std::vector<CFileInfo*> longNameList;
      };

private:

      bool        RemoveTrailingDot (char* shortname);
      Bits        GetLongName       (CFileInfo* info, char* shortname);
      void        CreateShortName         (CFileInfo* dir, CFileInfo* info);
      Bit16u            CreateShortNameID (CFileInfo* dir, const char* name);
      int         CompareShortname  (const char* compareName, const char* shortName);
      bool        SetResult         (CFileInfo* dir, char * &result, Bit16u entryNr);
      bool        IsCachedIn        (CFileInfo* dir);
      CFileInfo*  FindDirInfo       (const char* path, char* expandedPath);
      bool        RemoveSpaces            (char* str);
      bool        OpenDir                 (CFileInfo* dir, const char* path, Bit16u& id);
      void        CreateEntry       (CFileInfo* dir, const char* name);
      Bit16u            GetFreeID         (CFileInfo* dir);
      void        Clear             (void);

      CFileInfo*  dirBase;
      char        dirPath                       [CROSS_LEN];
      char        basePath                [CROSS_LEN];
      bool        dirFirstTime;
      TDirSort    sortDirType;
      CFileInfo*  save_dir;
      char        save_path               [CROSS_LEN];
      char        save_expanded           [CROSS_LEN];

      Bit16u            srchNr;
      CFileInfo*  dirSearch               [MAX_OPENDIRS];
      char        dirSearchName           [MAX_OPENDIRS];
      bool        free                    [MAX_OPENDIRS];
      CFileInfo*  dirFindFirst            [MAX_OPENDIRS];
      Bitu        nextFreeFindFirst;

      char        label                   [CROSS_LEN];
      bool        updatelabel;
};

class DOS_No_Drive_Cache {
public:
      DOS_No_Drive_Cache                        (void) {};
      DOS_No_Drive_Cache                        (const char* path);
      ~DOS_No_Drive_Cache                       (void) {};

      typedef enum TDirSort { NOSORT, ALPHABETICAL, DIRALPHABETICAL, ALPHABETICALREV, DIRALPHABETICALREV };

      void        SetBaseDir              (const char* path);
      void        SetDirSort              (TDirSort sort) {};
      bool        OpenDir                       (const char* path, Bit16u& id);
      bool        ReadDir                       (Bit16u id, char * &result);

      void        ExpandName              (char* path) {};
      char*       GetExpandName           (const char* path) { return (char*)path; };
      bool        GetShortName            (const char* fullname, char* shortname) { return false; };
      
      void        CacheOut                (const char* path, bool ignoreLastDir = false) {};
      void        AddEntry                (const char* path, bool checkExists = false) {};
      void        DeleteEntry             (const char* path, bool ignoreLastDir = false) {};

      void        SetCurrentEntry         (Bit16u entry) {};
      Bit16u            GetCurrentEntry         (void) { return 0; };

      void        EmptyCache              (void) {};
      
      void        SetLabel                (const char* name)      {};
      char*       GetLabel                (void)                        {return "";};

public:
      char        basePath                [CROSS_LEN];
      char        dirPath                       [CROSS_LEN];
};

class DOS_Drive {
public:
      DOS_Drive();
      virtual ~DOS_Drive(){};
      virtual bool FileOpen(DOS_File * * file,char * name,Bit32u flags)=0;
      virtual bool FileCreate(DOS_File * * file,char * name,Bit16u attributes)=0;
      virtual bool FileUnlink(char * _name)=0;
      virtual bool RemoveDir(char * _dir)=0;
      virtual bool MakeDir(char * _dir)=0;
      virtual bool TestDir(char * _dir)=0;
      virtual bool FindFirst(char * _dir,DOS_DTA & dta,bool fcb_findfirst=false)=0;
      virtual bool FindNext(DOS_DTA & dta)=0;
      virtual bool GetFileAttr(char * name,Bit16u * attr)=0;
      virtual bool Rename(char * oldname,char * newname)=0;
      virtual bool AllocationInfo(Bit16u * _bytes_sector,Bit8u * _sectors_cluster,Bit16u * _total_clusters,Bit16u * _free_clusters)=0;
      virtual bool FileExists(const char* name)=0;
      virtual bool FileStat(const char* name, FileStat_Block * const stat_block)=0;
      virtual Bit8u GetMediaByte(void)=0;
      virtual void SetDir(const char* path) { strcpy(curdir,path); };
      virtual void EmptyCache(void) { dirCache.EmptyCache(); };
      virtual bool isRemote(void)=0;
      virtual bool isRemovable(void)=0;
      char * GetInfo(void);
      char curdir[DOS_PATHLENGTH];
      char info[256];

      DOS_Drive_Cache dirCache;
};

enum { OPEN_READ=0,OPEN_WRITE=1,OPEN_READWRITE=2, DOS_NOT_INHERIT=128};
enum { DOS_SEEK_SET=0,DOS_SEEK_CUR=1,DOS_SEEK_END=2};


/*
 A multiplex handler should read the registers to check what function is being called 
 If the handler returns false dos will stop checking other handlers 
*/

typedef bool (MultiplexHandler)(void);
void DOS_AddMultiplexHandler(MultiplexHandler * handler);

void DOS_AddDevice(DOS_Device * adddev);
void VFILE_Register(const char * name,Bit8u * data,Bit32u size);
#endif


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