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# cpl_vsi.h

Go to the documentation of this file.

    00001 /******************************************************************************
    00002  * $Id: cpl_vsi.h 10646 2007-01-18 02:38:10Z warmerdam $
    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 #ifndef CPL_VSI_H_INCLUDED
    00032 #define CPL_VSI_H_INCLUDED
    00033
    00034 #include "cpl_port.h"
    00054 /* -------------------------------------------------------------------- */
    00055 /*      We need access to ``struct stat''.                              */
    00056 /* -------------------------------------------------------------------- */
    00057
    00058 /* Unix */
    00059 #if !defined(_WIN32) && !defined(_WIN32_WCE)
    00060 #  include <unistd.h>
    00061 #endif
    00062
    00063 /* Windows */
    00064 #if !defined(macos_pre10) && !defined(_WIN32_WCE)
    00065 #  include <sys/stat.h>
    00066 #endif
    00067
    00068 /* Windows CE */
    00069 #if defined(_WIN32_WCE)
    00070 #  include <wce_stat.h>
    00071 #endif
    00072
    00073 CPL_C_START
    00074
    00075 /* ==================================================================== */
    00076 /*      stdio file access functions.  These may not support large       */
    00077 /*      files, and don't necessarily go through the virtualization      */
    00078 /*      API.                                                            */
    00079 /* ==================================================================== */
    00080
    00081 FILE CPL_DLL *  VSIFOpen( const char *, const char * );
    00082 int CPL_DLL     VSIFClose( FILE * );
    00083 int CPL_DLL     VSIFSeek( FILE *, long, int );
    00084 long CPL_DLL    VSIFTell( FILE * );
    00085 void CPL_DLL    VSIRewind( FILE * );
    00086 void CPL_DLL    VSIFFlush( FILE * );
    00087
    00088 size_t CPL_DLL  VSIFRead( void *, size_t, size_t, FILE * );
    00089 size_t CPL_DLL  VSIFWrite( const void *, size_t, size_t, FILE * );
    00090 char CPL_DLL   *VSIFGets( char *, int, FILE * );
    00091 int CPL_DLL     VSIFPuts( const char *, FILE * );
    00092 int CPL_DLL     VSIFPrintf( FILE *, const char *, ... );
    00093
    00094 int CPL_DLL     VSIFGetc( FILE * );
    00095 int CPL_DLL     VSIFPutc( int, FILE * );
    00096 int CPL_DLL     VSIUngetc( int, FILE * );
    00097 int CPL_DLL     VSIFEof( FILE * );
    00098
    00099 /* ==================================================================== */
    00100 /*      VSIStat() related.                                              */
    00101 /* ==================================================================== */
    00102
    00103 typedef struct stat VSIStatBuf;
    00104 int CPL_DLL VSIStat( const char *, VSIStatBuf * );
    00105
    00106 #ifdef _WIN32
    00107 #  define VSI_ISLNK(x)  ( 0 )            /* N/A on Windows */
    00108 #  define VSI_ISREG(x)  ((x) & S_IFREG)
    00109 #  define VSI_ISDIR(x)  ((x) & S_IFDIR)
    00110 #  define VSI_ISCHR(x)  ((x) & S_IFCHR)
    00111 #  define VSI_ISBLK(x)  ( 0 )            /* N/A on Windows */
    00112 #else
    00113 #  define VSI_ISLNK(x)  S_ISLNK(x)
    00114 #  define VSI_ISREG(x)  S_ISREG(x)
    00115 #  define VSI_ISDIR(x)  S_ISDIR(x)
    00116 #  define VSI_ISCHR(x)  S_ISCHR(x)
    00117 #  define VSI_ISBLK(x)  S_ISBLK(x)
    00118 #endif
    00119
    00120 /* ==================================================================== */
    00121 /*      64bit stdio file access functions.  If we have a big size       */
    00122 /*      defined, then provide protypes for the large file API,          */
    00123 /*      otherwise redefine to use the regular api.                      */
    00124 /* ==================================================================== */
    00125 typedef GUIntBig vsi_l_offset;
    00126
    00127 FILE CPL_DLL *  VSIFOpenL( const char *, const char * );
    00128 int CPL_DLL     VSIFCloseL( FILE * );
    00129 int CPL_DLL     VSIFSeekL( FILE *, vsi_l_offset, int );
    00130 vsi_l_offset CPL_DLL VSIFTellL( FILE * );
    00131 void CPL_DLL    VSIRewindL( FILE * );
    00132 size_t CPL_DLL  VSIFReadL( void *, size_t, size_t, FILE * );
    00133 size_t CPL_DLL  VSIFWriteL( const void *, size_t, size_t, FILE * );
    00134 int CPL_DLL     VSIFEofL( FILE * );
    00135 int CPL_DLL    VSIFFlushL( FILE * );
    00136
    00137 #if defined(VSI_STAT64_T)
    00138 typedef struct VSI_STAT64_T VSIStatBufL;
    00139 #else
    00140 #define VSIStatBufL    VSIStatBuf
    00141 #endif
    00142
    00143 int CPL_DLL     VSIStatL( const char *, VSIStatBufL * );
    00144
    00145 /* ==================================================================== */
    00146 /*      Memory allocation                                               */
    00147 /* ==================================================================== */
    00148
    00149 void CPL_DLL   *VSICalloc( size_t, size_t );
    00150 void CPL_DLL   *VSIMalloc( size_t );
    00151 void CPL_DLL    VSIFree( void * );
    00152 void CPL_DLL   *VSIRealloc( void *, size_t );
    00153 char CPL_DLL   *VSIStrdup( const char * );
    00154
    00155 /* ==================================================================== */
    00156 /*      Other...                                                        */
    00157 /* ==================================================================== */
    00158
    00159 int CPL_DLL VSIMkdir( const char * pathname, long mode );
    00160 int CPL_DLL VSIRmdir( const char * pathname );
    00161 int CPL_DLL VSIUnlink( const char * pathname );
    00162 int CPL_DLL VSIRename( const char * oldpath, const char * newpath );
    00163 char CPL_DLL *VSIStrerror( int );
    00164
    00165 /* ==================================================================== */
    00166 /*      Install special file access handlers.                           */
    00167 /* ==================================================================== */
    00168 void CPL_DLL VSIInstallMemFileHandler(void);
    00169 void CPL_DLL VSIInstallLargeFileHandler(void);
    00170 void CPL_DLL VSICleanupFileManager(void);
    00171
    00172 FILE CPL_DLL *VSIFileFromMemBuffer( const char *pszFilename,
    00173                                     GByte *pabyData,
    00174                                     vsi_l_offset nDataLength,
    00175                                     int bTakeOwnership );
    00176 GByte CPL_DLL *VSIGetMemFileBuffer( const char *pszFilename,
    00177                                     vsi_l_offset *pnDataLength,
    00178                                     int bUnlinkAndSeize );
    00179
    00180 /* ==================================================================== */
    00181 /*      Time quering.                                                   */
    00182 /* ==================================================================== */
    00183
    00184 unsigned long CPL_DLL VSITime( unsigned long * );
    00185 const char CPL_DLL *VSICTime( unsigned long );
    00186 struct tm CPL_DLL *VSIGMTime( const time_t *pnTime,
    00187                               struct tm *poBrokenTime );
    00188 struct tm CPL_DLL *VSILocalTime( const time_t *pnTime,
    00189                                  struct tm *poBrokenTime );
    00190
    00191 /* -------------------------------------------------------------------- */
    00192 /*      the following can be turned on for detailed logging of          */
    00193 /*      almost all IO calls.                                            */
    00194 /* -------------------------------------------------------------------- */
    00195 #ifdef VSI_DEBUG
    00196
    00197 #ifndef DEBUG
    00198 #  define DEBUG
    00199 #endif
    00200
    00201 #include "cpl_error.h"
    00202
    00203 #define VSIDebug4(f,a1,a2,a3,a4)   CPLDebug( "VSI", f, a1, a2, a3, a4 );
    00204 #define VSIDebug3( f, a1, a2, a3 ) CPLDebug( "VSI", f, a1, a2, a3 );
    00205 #define VSIDebug2( f, a1, a2 )     CPLDebug( "VSI", f, a1, a2 );
    00206 #define VSIDebug1( f, a1 )         CPLDebug( "VSI", f, a1 );
    00207 #else
    00208 #define VSIDebug4( f, a1, a2, a3, a4 ) {}
    00209 #define VSIDebug3( f, a1, a2, a3 ) {}
    00210 #define VSIDebug2( f, a1, a2 )     {}
    00211 #define VSIDebug1( f, a1 )         {}
    00212 #endif
    00213
    00214 CPL_C_END
    00215
    00216 #endif /* ndef CPL_VSI_H_INCLUDED */

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