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filemgr.h

00001 /******************************************************************************
00002  *  filemgr.h   - definition of class FileMgr used for pooling file handles
00003  *
00004  * $Id: filemgr_h-source.html,v 1.4 2001/10/05 20:45:21 mgruner 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 
00027 #include <defs.h>
00028 
00029 class SWDLLEXPORT FileMgr;
00030 
00031 class SWDLLEXPORT FileDesc
00032 {
00033 
00034   friend class FileMgr;
00035 
00036   char *path;
00037   int mode;
00038   int perms;
00039   long offset;
00040   int fd;                       // -77 closed;
00041   FileMgr *parent;
00042   FileDesc *next;
00043 
00044 public:
00045    FileDesc (FileMgr * parent, char *path, int mode, int perms);
00046    virtual ~FileDesc ();
00047   int getFd ();
00048 };
00049 
00050 
00051 class FileMgr
00052 {
00053 
00054   friend class FileDesc;
00055 
00056   FileDesc *files;
00057   int sysOpen (FileDesc * file);
00058 public:
00059 
00060     FileMgr (int maxFiles = 35);
00061    ~FileMgr ();
00062   FileDesc *open (char *path, int mode, int perms = S_IREAD | S_IWRITE);
00063   void close (FileDesc *);
00064 
00065   static char existsFile (const char *ipath, const char *ifileName = 0);
00066   static char existsDir (const char *ipath, const char *idirName = 0);
00067   // to truncate a file at its current position
00068   // leaving byte at current possition intact
00069   // deleting everything afterward.
00070   char trunc (FileDesc *);
00071 
00072   int maxFiles;
00073   static FileMgr systemFileMgr;
00074 };
00075 
00076 
00077 
00078 
00079 #endif

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