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# cpl_vsi.h

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    00001 /******************************************************************************
    00002  * $Id: cpl_vsi.h 28476 2015-02-13 14:40:11Z rouault $
    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  * Copyright (c) 2008-2014, Even Rouault <even dot rouault at mines-paris dot org>
    00012  *
    00013  * Permission is hereby granted, free of charge, to any person obtaining a
    00014  * copy of this software and associated documentation files (the "Software"),
    00015  * to deal in the Software without restriction, including without limitation
    00016  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
    00017  * and/or sell copies of the Software, and to permit persons to whom the
    00018  * Software is furnished to do so, subject to the following conditions:
    00019  *
    00020  * The above copyright notice and this permission notice shall be included
    00021  * in all copies or substantial portions of the Software.
    00022  *
    00023  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
    00024  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    00025  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
    00026  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    00027  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
    00028  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
    00029  * DEALINGS IN THE SOFTWARE.
    00030  ****************************************************************************/
    00031
    00032 #ifndef CPL_VSI_H_INCLUDED
    00033 #define CPL_VSI_H_INCLUDED
    00034
    00035 #include "cpl_port.h"
    00055 /* -------------------------------------------------------------------- */
    00056 /*      We need access to ``struct stat''.                              */
    00057 /* -------------------------------------------------------------------- */
    00058
    00059 /* Unix */
    00060 #if !defined(_WIN32) && !defined(_WIN32_WCE)
    00061 #  include <unistd.h>
    00062 #endif
    00063
    00064 /* Windows */
    00065 #if !defined(macos_pre10) && !defined(_WIN32_WCE)
    00066 #  include <sys/stat.h>
    00067 #endif
    00068
    00069 /* Windows CE */
    00070 #if defined(_WIN32_WCE)
    00071 #  include <wce_stat.h>
    00072 #endif
    00073
    00074 CPL_C_START
    00075
    00076 /* ==================================================================== */
    00077 /*      stdio file access functions.  These may not support large       */
    00078 /*      files, and don't necessarily go through the virtualization      */
    00079 /*      API.                                                            */
    00080 /* ==================================================================== */
    00081
    00082 FILE CPL_DLL *  VSIFOpen( const char *, const char * ) CPL_WARN_UNUSED_RESULT;
    00083 int CPL_DLL     VSIFClose( FILE * );
    00084 int CPL_DLL     VSIFSeek( FILE *, long, int );
    00085 long CPL_DLL    VSIFTell( FILE * );
    00086 void CPL_DLL    VSIRewind( FILE * );
    00087 void CPL_DLL    VSIFFlush( FILE * );
    00088
    00089 size_t CPL_DLL  VSIFRead( void *, size_t, size_t, FILE * );
    00090 size_t CPL_DLL  VSIFWrite( const void *, size_t, size_t, FILE * );
    00091 char CPL_DLL   *VSIFGets( char *, int, FILE * );
    00092 int CPL_DLL     VSIFPuts( const char *, FILE * );
    00093 int CPL_DLL     VSIFPrintf( FILE *, const char *, ... ) CPL_PRINT_FUNC_FORMAT(2, 3);
    00094
    00095 int CPL_DLL     VSIFGetc( FILE * );
    00096 int CPL_DLL     VSIFPutc( int, FILE * );
    00097 int CPL_DLL     VSIUngetc( int, FILE * );
    00098 int CPL_DLL     VSIFEof( FILE * );
    00099
    00100 /* ==================================================================== */
    00101 /*      VSIStat() related.                                              */
    00102 /* ==================================================================== */
    00103
    00104 typedef struct stat VSIStatBuf;
    00105 int CPL_DLL VSIStat( const char *, VSIStatBuf * );
    00106
    00107 #ifdef _WIN32
    00108 #  define VSI_ISLNK(x)  ( 0 )            /* N/A on Windows */
    00109 #  define VSI_ISREG(x)  ((x) & S_IFREG)
    00110 #  define VSI_ISDIR(x)  ((x) & S_IFDIR)
    00111 #  define VSI_ISCHR(x)  ((x) & S_IFCHR)
    00112 #  define VSI_ISBLK(x)  ( 0 )            /* N/A on Windows */
    00113 #else
    00114 #  define VSI_ISLNK(x)  S_ISLNK(x)
    00115 #  define VSI_ISREG(x)  S_ISREG(x)
    00116 #  define VSI_ISDIR(x)  S_ISDIR(x)
    00117 #  define VSI_ISCHR(x)  S_ISCHR(x)
    00118 #  define VSI_ISBLK(x)  S_ISBLK(x)
    00119 #endif
    00120
    00121 /* ==================================================================== */
    00122 /*      64bit stdio file access functions.  If we have a big size       */
    00123 /*      defined, then provide protypes for the large file API,          */
    00124 /*      otherwise redefine to use the regular api.                      */
    00125 /* ==================================================================== */
    00126 typedef GUIntBig vsi_l_offset;
    00127
    00128 /* Make VSIL_STRICT_ENFORCE active in DEBUG builds */
    00129 #ifdef DEBUG
    00130 #define VSIL_STRICT_ENFORCE
    00131 #endif
    00132
    00133 #ifdef VSIL_STRICT_ENFORCE
    00134 typedef struct _VSILFILE VSILFILE;
    00135 #else
    00136 typedef FILE VSILFILE;
    00137 #endif
    00138
    00139 VSILFILE CPL_DLL *  VSIFOpenL( const char *, const char * ) CPL_WARN_UNUSED_RESULT;
    00140 int CPL_DLL     VSIFCloseL( VSILFILE * );
    00141 int CPL_DLL     VSIFSeekL( VSILFILE *, vsi_l_offset, int );
    00142 vsi_l_offset CPL_DLL VSIFTellL( VSILFILE * );
    00143 void CPL_DLL    VSIRewindL( VSILFILE * );
    00144 size_t CPL_DLL  VSIFReadL( void *, size_t, size_t, VSILFILE * );
    00145 int CPL_DLL     VSIFReadMultiRangeL( int nRanges, void ** ppData, const vsi_l_offset* panOffsets, const size_t* panSizes, VSILFILE * );
    00146 size_t CPL_DLL  VSIFWriteL( const void *, size_t, size_t, VSILFILE * );
    00147 int CPL_DLL     VSIFEofL( VSILFILE * );
    00148 int CPL_DLL     VSIFTruncateL( VSILFILE *, vsi_l_offset );
    00149 int CPL_DLL     VSIFFlushL( VSILFILE * );
    00150 int CPL_DLL     VSIFPrintfL( VSILFILE *, const char *, ... ) CPL_PRINT_FUNC_FORMAT(2, 3);
    00151 int CPL_DLL     VSIFPutcL( int, VSILFILE * );
    00152
    00153 int CPL_DLL     VSIIngestFile( VSILFILE* fp,
    00154                                const char* pszFilename,
    00155                                GByte** ppabyRet,
    00156                                vsi_l_offset* pnSize,
    00157                                GIntBig nMaxSize );
    00158
    00159 #if defined(VSI_STAT64_T)
    00160 typedef struct VSI_STAT64_T VSIStatBufL;
    00161 #else
    00162 #define VSIStatBufL    VSIStatBuf
    00163 #endif
    00164
    00165 int CPL_DLL     VSIStatL( const char *, VSIStatBufL * );
    00166
    00167 #define VSI_STAT_EXISTS_FLAG    0x1
    00168 #define VSI_STAT_NATURE_FLAG    0x2
    00169 #define VSI_STAT_SIZE_FLAG      0x4
    00170
    00171 int CPL_DLL     VSIStatExL( const char * pszFilename, VSIStatBufL * psStatBuf, int nFlags );
    00172
    00173 int CPL_DLL     VSIIsCaseSensitiveFS( const char * pszFilename );
    00174
    00175 void CPL_DLL   *VSIFGetNativeFileDescriptorL( VSILFILE* );
    00176
    00177 /* ==================================================================== */
    00178 /*      Memory allocation                                               */
    00179 /* ==================================================================== */
    00180
    00181 void CPL_DLL   *VSICalloc( size_t, size_t ) CPL_WARN_UNUSED_RESULT;
    00182 void CPL_DLL   *VSIMalloc( size_t ) CPL_WARN_UNUSED_RESULT;
    00183 void CPL_DLL    VSIFree( void * );
    00184 void CPL_DLL   *VSIRealloc( void *, size_t ) CPL_WARN_UNUSED_RESULT;
    00185 char CPL_DLL   *VSIStrdup( const char * ) CPL_WARN_UNUSED_RESULT;
    00186
    00194 void CPL_DLL *VSIMalloc2( size_t nSize1, size_t nSize2 ) CPL_WARN_UNUSED_RESULT;
    00195
    00203 void CPL_DLL *VSIMalloc3( size_t nSize1, size_t nSize2, size_t nSize3 ) CPL_WARN_UNUSED_RESULT;
    00204
    00205 GIntBig CPL_DLL CPLGetPhysicalRAM(void);
    00206 GIntBig CPL_DLL CPLGetUsablePhysicalRAM(void);
    00207
    00208 /* ==================================================================== */
    00209 /*      Other...                                                        */
    00210 /* ==================================================================== */
    00211
    00212 #define CPLReadDir VSIReadDir
    00213 char CPL_DLL **VSIReadDir( const char * );
    00214 char CPL_DLL **VSIReadDirRecursive( const char *pszPath );
    00215 int CPL_DLL VSIMkdir( const char * pathname, long mode );
    00216 int CPL_DLL VSIRmdir( const char * pathname );
    00217 int CPL_DLL VSIUnlink( const char * pathname );
    00218 int CPL_DLL VSIRename( const char * oldpath, const char * newpath );
    00219 char CPL_DLL *VSIStrerror( int );
    00220
    00221 /* ==================================================================== */
    00222 /*      Install special file access handlers.                           */
    00223 /* ==================================================================== */
    00224 void CPL_DLL VSIInstallMemFileHandler(void);
    00225 void CPL_DLL VSIInstallLargeFileHandler(void);
    00226 void CPL_DLL VSIInstallSubFileHandler(void);
    00227 void VSIInstallCurlFileHandler(void);
    00228 void VSIInstallCurlStreamingFileHandler(void);
    00229 void VSIInstallGZipFileHandler(void); /* No reason to export that */
    00230 void VSIInstallZipFileHandler(void); /* No reason to export that */
    00231 void VSIInstallStdinHandler(void); /* No reason to export that */
    00232 void VSIInstallStdoutHandler(void); /* No reason to export that */
    00233 void CPL_DLL VSIInstallSparseFileHandler(void);
    00234 void VSIInstallTarFileHandler(void); /* No reason to export that */
    00235 void CPL_DLL VSICleanupFileManager(void);
    00236
    00237 VSILFILE CPL_DLL *VSIFileFromMemBuffer( const char *pszFilename,
    00238                                     GByte *pabyData,
    00239                                     vsi_l_offset nDataLength,
    00240                                     int bTakeOwnership );
    00241 GByte CPL_DLL *VSIGetMemFileBuffer( const char *pszFilename,
    00242                                     vsi_l_offset *pnDataLength,
    00243                                     int bUnlinkAndSeize );
    00244
    00245 typedef size_t (*VSIWriteFunction)(const void* ptr, size_t size, size_t nmemb, FILE* stream);
    00246 void CPL_DLL VSIStdoutSetRedirection( VSIWriteFunction pFct, FILE* stream );
    00247
    00248 /* ==================================================================== */
    00249 /*      Time quering.                                                   */
    00250 /* ==================================================================== */
    00251
    00252 unsigned long CPL_DLL VSITime( unsigned long * );
    00253 const char CPL_DLL *VSICTime( unsigned long );
    00254 struct tm CPL_DLL *VSIGMTime( const time_t *pnTime,
    00255                               struct tm *poBrokenTime );
    00256 struct tm CPL_DLL *VSILocalTime( const time_t *pnTime,
    00257                                  struct tm *poBrokenTime );
    00258
    00259 /* -------------------------------------------------------------------- */
    00260 /*      the following can be turned on for detailed logging of          */
    00261 /*      almost all IO calls.                                            */
    00262 /* -------------------------------------------------------------------- */
    00263 #ifdef VSI_DEBUG
    00264
    00265 #ifndef DEBUG
    00266 #  define DEBUG
    00267 #endif
    00268
    00269 #include "cpl_error.h"
    00270
    00271 #define VSIDebug4(f,a1,a2,a3,a4)   CPLDebug( "VSI", f, a1, a2, a3, a4 );
    00272 #define VSIDebug3( f, a1, a2, a3 ) CPLDebug( "VSI", f, a1, a2, a3 );
    00273 #define VSIDebug2( f, a1, a2 )     CPLDebug( "VSI", f, a1, a2 );
    00274 #define VSIDebug1( f, a1 )         CPLDebug( "VSI", f, a1 );
    00275 #else
    00276 #define VSIDebug4( f, a1, a2, a3, a4 ) {}
    00277 #define VSIDebug3( f, a1, a2, a3 ) {}
    00278 #define VSIDebug2( f, a1, a2 )     {}
    00279 #define VSIDebug1( f, a1 )         {}
    00280 #endif
    00281
    00282 CPL_C_END
    00283
    00284 #endif /* ndef CPL_VSI_H_INCLUDED */

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