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# cpl_vsi.h

Go to the documentation of this file.

    00001 /******************************************************************************
    00002  * $Id: cpl_vsi.h,v 1.31 2006/03/27 15:24:41 fwarmerdam Exp $
    00003  *
    00004  * Project:  CPL - Common Portability Library
    00005  * Author:   Frank Warmerdam, warmerdam@pobox.com
    00006  * Purpose:  Include file defining Virtual File System (VSI) functions, a
    00007  *           layer over POSIX file and other system services.
    00008  *
    00009  ******************************************************************************
    00010  * Copyright (c) 1998, Frank Warmerdam
    00011  *
    00012  * Permission is hereby granted, free of charge, to any person obtaining a
    00013  * copy of this software and associated documentation files (the "Software"),
    00014  * to deal in the Software without restriction, including without limitation
    00015  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
    00016  * and/or sell copies of the Software, and to permit persons to whom the
    00017  * Software is furnished to do so, subject to the following conditions:
    00018  *
    00019  * The above copyright notice and this permission notice shall be included
    00020  * in all copies or substantial portions of the Software.
    00021  *
    00022  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
    00023  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    00024  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
    00025  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    00026  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
    00027  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
    00028  * DEALINGS IN THE SOFTWARE.
    00029  ******************************************************************************
    00030  *
    00031  * $Log: cpl_vsi.h,v $
    00032  * Revision 1.31  2006/03/27 15:24:41  fwarmerdam
    00033  * buffer in FWrite is const
    00034  *
    00035  * Revision 1.30  2006/03/21 20:11:54  fwarmerdam
    00036  * fixup headers a bit
    00037  *
    00038  * Revision 1.29  2006/02/19 21:54:34  mloskot
    00039  * [WINCE] Changes related to Windows CE port of CPL. Most changes are #ifdef wrappers.
    00040  *
    00041  * Revision 1.28  2006/01/10 17:03:56  fwarmerdam
    00042  * added VSI Rename support
    00043  *
    00044  * Revision 1.27  2005/10/07 00:26:27  fwarmerdam
    00045  * add documentation
    00046  *
    00047  * Revision 1.26  2005/10/03 18:56:40  fwarmerdam
    00048  * always define large file api - cygwin fix
    00049  *
    00050  * Revision 1.25  2005/09/15 18:32:35  fwarmerdam
    00051  * added VSICleanupFileManager
    00052  *
    00053  * Revision 1.24  2005/09/12 16:53:33  fwarmerdam
    00054  * fixed VSIGetMemFileBuffer declaration
    00055  *
    00056  * Revision 1.23  2005/09/12 16:50:37  fwarmerdam
    00057  * added VSIMemFile buffer fetcher
    00058  *
    00059  * Revision 1.22  2005/09/11 18:31:41  fwarmerdam
    00060  * ensure a distinct VSIStatL() exists on win32
    00061  *
    00062  * Revision 1.21  2005/09/11 18:01:28  fwarmerdam
    00063  * preliminary implementatin of fully virtualized large file api
    00064  *
    00065  * Revision 1.20  2005/04/12 03:51:11  fwarmerdam
    00066  * Fixed stat64 problem.
    00067  *
    00068  * Revision 1.19  2005/04/12 00:27:39  fwarmerdam
    00069  * added macos large file support
    00070  *
    00071  * Revision 1.18  2003/09/10 19:44:36  warmerda
    00072  * added VSIStrerrno()
    00073  *
    00074  * Revision 1.17  2003/09/08 08:11:40  dron
    00075  * Added VSIGMTime() and VSILocalTime().
    00076  *
    00077  * Revision 1.16  2003/05/27 20:44:40  warmerda
    00078  * added VSI io debugging macros
    00079  */
    00080
    00081 #ifndef CPL_VSI_H_INCLUDED
    00082 #define CPL_VSI_H_INCLUDED
    00083
    00084 #include "cpl_port.h"
    00104 /* -------------------------------------------------------------------- */
    00105 /*      We need access to ``struct stat''.                              */
    00106 /* -------------------------------------------------------------------- */
    00107
    00108 /* Unix */
    00109 #if !defined(_WIN32) && !defined(_WIN32_WCE)
    00110 #  include <unistd.h>
    00111 #endif
    00112
    00113 /* Windows */
    00114 #if !defined(macos_pre10) && !defined(_WIN32_WCE)
    00115 #  include <sys/stat.h>
    00116 #endif
    00117
    00118 /* Windows CE */
    00119 #if defined(_WIN32_WCE)
    00120 #  include <wce_stat.h>
    00121 #endif
    00122
    00123 CPL_C_START
    00124
    00125 /* ==================================================================== */
    00126 /*      stdio file access functions.  These may not support large       */
    00127 /*      files, and don't necessarily go through the virtualization      */
    00128 /*      API.                                                            */
    00129 /* ==================================================================== */
    00130
    00131 FILE CPL_DLL *  VSIFOpen( const char *, const char * );
    00132 int CPL_DLL     VSIFClose( FILE * );
    00133 int CPL_DLL     VSIFSeek( FILE *, long, int );
    00134 long CPL_DLL    VSIFTell( FILE * );
    00135 void CPL_DLL    VSIRewind( FILE * );
    00136 void CPL_DLL    VSIFFlush( FILE * );
    00137
    00138 size_t CPL_DLL  VSIFRead( void *, size_t, size_t, FILE * );
    00139 size_t CPL_DLL  VSIFWrite( const void *, size_t, size_t, FILE * );
    00140 char CPL_DLL   *VSIFGets( char *, int, FILE * );
    00141 int CPL_DLL     VSIFPuts( const char *, FILE * );
    00142 int CPL_DLL     VSIFPrintf( FILE *, const char *, ... );
    00143
    00144 int CPL_DLL     VSIFGetc( FILE * );
    00145 int CPL_DLL     VSIFPutc( int, FILE * );
    00146 int CPL_DLL     VSIUngetc( int, FILE * );
    00147 int CPL_DLL     VSIFEof( FILE * );
    00148
    00149 /* ==================================================================== */
    00150 /*      VSIStat() related.                                              */
    00151 /* ==================================================================== */
    00152
    00153 typedef struct stat VSIStatBuf;
    00154 int CPL_DLL VSIStat( const char *, VSIStatBuf * );
    00155
    00156 #ifdef _WIN32
    00157 #  define VSI_ISLNK(x)  ( 0 )            /* N/A on Windows */
    00158 #  define VSI_ISREG(x)  ((x) & S_IFREG)
    00159 #  define VSI_ISDIR(x)  ((x) & S_IFDIR)
    00160 #  define VSI_ISCHR(x)  ((x) & S_IFCHR)
    00161 #  define VSI_ISBLK(x)  ( 0 )            /* N/A on Windows */
    00162 #else
    00163 #  define VSI_ISLNK(x)  S_ISLNK(x)
    00164 #  define VSI_ISREG(x)  S_ISREG(x)
    00165 #  define VSI_ISDIR(x)  S_ISDIR(x)
    00166 #  define VSI_ISCHR(x)  S_ISCHR(x)
    00167 #  define VSI_ISBLK(x)  S_ISBLK(x)
    00168 #endif
    00169
    00170 /* ==================================================================== */
    00171 /*      64bit stdio file access functions.  If we have a big size       */
    00172 /*      defined, then provide protypes for the large file API,          */
    00173 /*      otherwise redefine to use the regular api.                      */
    00174 /* ==================================================================== */
    00175 typedef GUIntBig vsi_l_offset;
    00176
    00177 FILE CPL_DLL *  VSIFOpenL( const char *, const char * );
    00178 int CPL_DLL     VSIFCloseL( FILE * );
    00179 int CPL_DLL     VSIFSeekL( FILE *, vsi_l_offset, int );
    00180 vsi_l_offset CPL_DLL VSIFTellL( FILE * );
    00181 void CPL_DLL    VSIRewindL( FILE * );
    00182 size_t CPL_DLL  VSIFReadL( void *, size_t, size_t, FILE * );
    00183 size_t CPL_DLL  VSIFWriteL( const void *, size_t, size_t, FILE * );
    00184 int CPL_DLL     VSIFEofL( FILE * );
    00185 int CPL_DLL    VSIFFlushL( FILE * );
    00186
    00187 #if defined(VSI_STAT64_T)
    00188 typedef struct VSI_STAT64_T VSIStatBufL;
    00189 #else
    00190 #define VSIStatBufL    VSIStatBuf
    00191 #endif
    00192
    00193 int CPL_DLL     VSIStatL( const char *, VSIStatBufL * );
    00194
    00195 /* ==================================================================== */
    00196 /*      Memory allocation                                               */
    00197 /* ==================================================================== */
    00198
    00199 void CPL_DLL   *VSICalloc( size_t, size_t );
    00200 void CPL_DLL   *VSIMalloc( size_t );
    00201 void CPL_DLL    VSIFree( void * );
    00202 void CPL_DLL   *VSIRealloc( void *, size_t );
    00203 char CPL_DLL   *VSIStrdup( const char * );
    00204
    00205 /* ==================================================================== */
    00206 /*      Other...                                                        */
    00207 /* ==================================================================== */
    00208
    00209 int CPL_DLL VSIMkdir( const char * pathname, long mode );
    00210 int CPL_DLL VSIRmdir( const char * pathname );
    00211 int CPL_DLL VSIUnlink( const char * pathname );
    00212 int CPL_DLL VSIRename( const char * oldpath, const char * newpath );
    00213 char CPL_DLL *VSIStrerror( int );
    00214
    00215 /* ==================================================================== */
    00216 /*      Install special file access handlers.                           */
    00217 /* ==================================================================== */
    00218 void CPL_DLL VSIInstallMemFileHandler(void);
    00219 void CPL_DLL VSIInstallLargeFileHandler(void);
    00220 void CPL_DLL VSICleanupFileManager(void);
    00221
    00222 FILE CPL_DLL *VSIFileFromMemBuffer( const char *pszFilename,
    00223                                     GByte *pabyData,
    00224                                     vsi_l_offset nDataLength,
    00225                                     int bTakeOwnership );
    00226 GByte CPL_DLL *VSIGetMemFileBuffer( const char *pszFilename,
    00227                                     vsi_l_offset *pnDataLength,
    00228                                     int bUnlinkAndSeize );
    00229
    00230 /* ==================================================================== */
    00231 /*      Time quering.                                                   */
    00232 /* ==================================================================== */
    00233
    00234 unsigned long CPL_DLL VSITime( unsigned long * );
    00235 const char CPL_DLL *VSICTime( unsigned long );
    00236 struct tm CPL_DLL *VSIGMTime( const time_t *pnTime,
    00237                               struct tm *poBrokenTime );
    00238 struct tm CPL_DLL *VSILocalTime( const time_t *pnTime,
    00239                                  struct tm *poBrokenTime );
    00240
    00241 /* -------------------------------------------------------------------- */
    00242 /*      the following can be turned on for detailed logging of          */
    00243 /*      almost all IO calls.                                            */
    00244 /* -------------------------------------------------------------------- */
    00245 #ifdef VSI_DEBUG
    00246
    00247 #ifndef DEBUG
    00248 #  define DEBUG
    00249 #endif
    00250
    00251 #include "cpl_error.h"
    00252
    00253 #define VSIDebug4(f,a1,a2,a3,a4)   CPLDebug( "VSI", f, a1, a2, a3, a4 );
    00254 #define VSIDebug3( f, a1, a2, a3 ) CPLDebug( "VSI", f, a1, a2, a3 );
    00255 #define VSIDebug2( f, a1, a2 )     CPLDebug( "VSI", f, a1, a2 );
    00256 #define VSIDebug1( f, a1 )         CPLDebug( "VSI", f, a1 );
    00257 #else
    00258 #define VSIDebug4( f, a1, a2, a3, a4 ) {}
    00259 #define VSIDebug3( f, a1, a2, a3 ) {}
    00260 #define VSIDebug2( f, a1, a2 )     {}
    00261 #define VSIDebug1( f, a1 )         {}
    00262 #endif
    00263
    00264 CPL_C_END
    00265
    00266 #endif /* ndef CPL_VSI_H_INCLUDED */

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