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filemgr.h

00001 /******************************************************************************
00002  *  filemgr.h   - definition of class FileMgr used for pooling file handles
00003  *
00004  * $Id: filemgr_8h-source.html,v 1.4 2002/01/22 14:20:27 jansorg Exp $
00005  *
00006  * Copyright 1998 CrossWire Bible Society (http://www.crosswire.org)
00007  *      CrossWire Bible Society
00008  *      P. O. Box 2528
00009  *      Tempe, AZ  85280-2528
00010  *
00011  * This program is free software; you can redistribute it and/or modify it
00012  * under the terms of the GNU General Public License as published by the
00013  * Free Software Foundation version 2.
00014  *
00015  * This program is distributed in the hope that it will be useful, but
00016  * WITHOUT ANY WARRANTY; without even the implied warranty of
00017  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00018  * General Public License for more details.
00019  *
00020  */
00021 
00022 #ifndef FILEMGR_H
00023 #define FILEMGR_H
00024 
00025 #include <sys/stat.h>
00026 #ifdef BEOS
00027 #include <fcntl.h>
00028 #endif
00029 
00030 #include <defs.h>
00031 
00032 class SWDLLEXPORT FileMgr;
00033 
00034 class SWDLLEXPORT FileDesc
00035 {
00036 
00037   friend class FileMgr;
00038 
00039   char *path;
00040   int mode;
00041   int perms;
00042   long offset;
00043   int fd;                       // -77 closed;
00044   FileMgr *parent;
00045   FileDesc *next;
00046 
00047 public:
00048    FileDesc (FileMgr * parent, char *path, int mode, int perms);
00049    virtual ~FileDesc ();
00050   int getFd ();
00051 };
00052 
00053 
00054 class FileMgr
00055 {
00056 
00057   friend class FileDesc;
00058 
00059   FileDesc *files;
00060   int sysOpen (FileDesc * file);
00061 public:
00062 
00063     FileMgr (int maxFiles = 35);
00064    ~FileMgr ();
00065   FileDesc *open (char *path, int mode, int perms = S_IREAD | S_IWRITE);
00066   void close (FileDesc *);
00067 
00068   static signed char existsFile (const char *ipath, const char *ifileName = 0);
00069   static signed char existsDir (const char *ipath, const char *idirName = 0);
00070   // to truncate a file at its current position
00071   // leaving byte at current possition intact
00072   // deleting everything afterward.
00073   signed char trunc (FileDesc *);
00074 
00075   int maxFiles;
00076   static FileMgr systemFileMgr;
00077 };
00078 
00079 
00080 
00081 
00082 #endif

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