cpl_vsi.h

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/******************************************************************************
 * $Id: cpl_vsi.h 7b937306fdeb31f6adefa6675d83ccd60f99e619 2018-11-25 23:10:44 +0100 Even Rouault $
 *
 * Project:  CPL - Common Portability Library
 * Author:   Frank Warmerdam, warmerdam@pobox.com
 * Purpose:  Include file defining Virtual File System (VSI) functions, a
 *           layer over POSIX file and other system services.
 *
 ******************************************************************************
 * Copyright (c) 1998, Frank Warmerdam
 * Copyright (c) 2008-2014, Even Rouault <even dot rouault at mines-paris dot org>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 ****************************************************************************/

#ifndef CPL_VSI_H_INCLUDED
#define CPL_VSI_H_INCLUDED

#include "cpl_port.h"
#include "cpl_progress.h"

/* -------------------------------------------------------------------- */
/*      We need access to ``struct stat''.                              */
/* -------------------------------------------------------------------- */

/* Unix */
#if !defined(_WIN32)
#  include <unistd.h>
#endif

/* Windows */
#include <sys/stat.h>

CPL_C_START

#ifdef ENABLE_EXPERIMENTAL_CPL_WARN_UNUSED_RESULT
#define EXPERIMENTAL_CPL_WARN_UNUSED_RESULT CPL_WARN_UNUSED_RESULT
#else
#define EXPERIMENTAL_CPL_WARN_UNUSED_RESULT
#endif

/* ==================================================================== */
/*      stdio file access functions.  These do not support large       */
/*      files, and do not go through the virtualization API.           */
/* ==================================================================== */

FILE CPL_DLL *  VSIFOpen( const char *, const char * ) CPL_WARN_UNUSED_RESULT;
int CPL_DLL     VSIFClose( FILE * );
int CPL_DLL     VSIFSeek( FILE *, long, int ) EXPERIMENTAL_CPL_WARN_UNUSED_RESULT;
long CPL_DLL    VSIFTell( FILE * ) CPL_WARN_UNUSED_RESULT;
void CPL_DLL    VSIRewind( FILE * );
void CPL_DLL    VSIFFlush( FILE * );

size_t CPL_DLL  VSIFRead( void *, size_t, size_t, FILE * ) EXPERIMENTAL_CPL_WARN_UNUSED_RESULT;
size_t CPL_DLL  VSIFWrite( const void *, size_t, size_t, FILE * ) EXPERIMENTAL_CPL_WARN_UNUSED_RESULT;
char CPL_DLL   *VSIFGets( char *, int, FILE * ) EXPERIMENTAL_CPL_WARN_UNUSED_RESULT;
int CPL_DLL     VSIFPuts( const char *, FILE * ) EXPERIMENTAL_CPL_WARN_UNUSED_RESULT;
int CPL_DLL     VSIFPrintf( FILE *, CPL_FORMAT_STRING(const char *), ... ) EXPERIMENTAL_CPL_WARN_UNUSED_RESULT CPL_PRINT_FUNC_FORMAT(2, 3);

int CPL_DLL     VSIFGetc( FILE * ) EXPERIMENTAL_CPL_WARN_UNUSED_RESULT;
int CPL_DLL     VSIFPutc( int, FILE * ) EXPERIMENTAL_CPL_WARN_UNUSED_RESULT;
int CPL_DLL     VSIUngetc( int, FILE * ) EXPERIMENTAL_CPL_WARN_UNUSED_RESULT;
int CPL_DLL     VSIFEof( FILE * ) EXPERIMENTAL_CPL_WARN_UNUSED_RESULT;

/* ==================================================================== */
/*      VSIStat() related.                                              */
/* ==================================================================== */

typedef struct stat VSIStatBuf;
int CPL_DLL VSIStat( const char *, VSIStatBuf * ) CPL_WARN_UNUSED_RESULT;
#ifdef _WIN32
#  define VSI_ISLNK(x)  ( 0 )            /* N/A on Windows */
#  define VSI_ISREG(x)  ((x) & S_IFREG)
#  define VSI_ISDIR(x)  ((x) & S_IFDIR)
#  define VSI_ISCHR(x)  ((x) & S_IFCHR)
#  define VSI_ISBLK(x)  ( 0 )            /* N/A on Windows */
#else

#  define VSI_ISLNK(x)  S_ISLNK(x)

#  define VSI_ISREG(x)  S_ISREG(x)

#  define VSI_ISDIR(x)  S_ISDIR(x)

#  define VSI_ISCHR(x)  S_ISCHR(x)
#  define VSI_ISBLK(x)  S_ISBLK(x)

#endif

/* ==================================================================== */
/*      64bit stdio file access functions.  If we have a big size       */
/*      defined, then provide prototypes for the large file API,        */
/*      otherwise redefine to use the regular api.                      */
/* ==================================================================== */

typedef GUIntBig vsi_l_offset;
#define VSI_L_OFFSET_MAX GUINTBIG_MAX

/* Make VSIL_STRICT_ENFORCE active in DEBUG builds */
#ifdef DEBUG
#define VSIL_STRICT_ENFORCE
#endif

#ifdef VSIL_STRICT_ENFORCE

typedef struct _VSILFILE VSILFILE;
#else

typedef FILE VSILFILE;
#endif

VSILFILE CPL_DLL *  VSIFOpenL( const char *, const char * ) CPL_WARN_UNUSED_RESULT;
VSILFILE CPL_DLL *  VSIFOpenExL( const char *, const char *, int ) CPL_WARN_UNUSED_RESULT;
int CPL_DLL     VSIFCloseL( VSILFILE * ) EXPERIMENTAL_CPL_WARN_UNUSED_RESULT;
int CPL_DLL     VSIFSeekL( VSILFILE *, vsi_l_offset, int ) EXPERIMENTAL_CPL_WARN_UNUSED_RESULT;
vsi_l_offset CPL_DLL VSIFTellL( VSILFILE * ) CPL_WARN_UNUSED_RESULT;
void CPL_DLL    VSIRewindL( VSILFILE * );
size_t CPL_DLL  VSIFReadL( void *, size_t, size_t, VSILFILE * ) EXPERIMENTAL_CPL_WARN_UNUSED_RESULT;
int CPL_DLL     VSIFReadMultiRangeL( int nRanges, void ** ppData, const vsi_l_offset* panOffsets, const size_t* panSizes, VSILFILE * ) EXPERIMENTAL_CPL_WARN_UNUSED_RESULT;
size_t CPL_DLL  VSIFWriteL( const void *, size_t, size_t, VSILFILE * ) EXPERIMENTAL_CPL_WARN_UNUSED_RESULT;
int CPL_DLL     VSIFEofL( VSILFILE * ) EXPERIMENTAL_CPL_WARN_UNUSED_RESULT;
int CPL_DLL     VSIFTruncateL( VSILFILE *, vsi_l_offset ) EXPERIMENTAL_CPL_WARN_UNUSED_RESULT;
int CPL_DLL     VSIFFlushL( VSILFILE * ) EXPERIMENTAL_CPL_WARN_UNUSED_RESULT;
int CPL_DLL     VSIFPrintfL( VSILFILE *, CPL_FORMAT_STRING(const char *), ... ) EXPERIMENTAL_CPL_WARN_UNUSED_RESULT CPL_PRINT_FUNC_FORMAT(2, 3);
int CPL_DLL     VSIFPutcL( int, VSILFILE * ) EXPERIMENTAL_CPL_WARN_UNUSED_RESULT;

typedef enum
{
    VSI_RANGE_STATUS_UNKNOWN, 
    VSI_RANGE_STATUS_DATA,    
    VSI_RANGE_STATUS_HOLE     
} VSIRangeStatus;

VSIRangeStatus CPL_DLL VSIFGetRangeStatusL( VSILFILE * fp, vsi_l_offset nStart, vsi_l_offset nLength );

int CPL_DLL     VSIIngestFile( VSILFILE* fp,
                               const char* pszFilename,
                               GByte** ppabyRet,
                               vsi_l_offset* pnSize,
                               GIntBig nMaxSize ) CPL_WARN_UNUSED_RESULT;

#if defined(VSI_STAT64_T)

typedef struct VSI_STAT64_T VSIStatBufL;
#else

#define VSIStatBufL    VSIStatBuf
#endif

int CPL_DLL     VSIStatL( const char *, VSIStatBufL * ) CPL_WARN_UNUSED_RESULT;

#define VSI_STAT_EXISTS_FLAG         0x1

#define VSI_STAT_NATURE_FLAG         0x2

#define VSI_STAT_SIZE_FLAG           0x4

#define VSI_STAT_SET_ERROR_FLAG      0x8

int CPL_DLL     VSIStatExL( const char * pszFilename, VSIStatBufL * psStatBuf, int nFlags ) CPL_WARN_UNUSED_RESULT;

int CPL_DLL     VSIIsCaseSensitiveFS( const char * pszFilename );

int CPL_DLL     VSISupportsSparseFiles( const char* pszPath );

int CPL_DLL     VSIHasOptimizedReadMultiRange( const char* pszPath );

const char CPL_DLL *VSIGetActualURL( const char* pszFilename );

char CPL_DLL *VSIGetSignedURL( const char* pszFilename, CSLConstList papszOptions );

const char CPL_DLL *VSIGetFileSystemOptions( const char* pszFilename );

char CPL_DLL **VSIGetFileSystemsPrefixes( void );

void CPL_DLL   *VSIFGetNativeFileDescriptorL( VSILFILE* );

/* ==================================================================== */
/*      Memory allocation                                               */
/* ==================================================================== */

void CPL_DLL   *VSICalloc( size_t, size_t ) CPL_WARN_UNUSED_RESULT;
void CPL_DLL   *VSIMalloc( size_t ) CPL_WARN_UNUSED_RESULT;
void CPL_DLL    VSIFree( void * );
void CPL_DLL   *VSIRealloc( void *, size_t ) CPL_WARN_UNUSED_RESULT;
char CPL_DLL   *VSIStrdup( const char * ) CPL_WARN_UNUSED_RESULT;

void CPL_DLL   *VSIMallocAligned( size_t nAlignment, size_t nSize ) CPL_WARN_UNUSED_RESULT;
void CPL_DLL   *VSIMallocAlignedAuto( size_t nSize ) CPL_WARN_UNUSED_RESULT;
void CPL_DLL    VSIFreeAligned( void* ptr );

void CPL_DLL   *VSIMallocAlignedAutoVerbose( size_t nSize, const char* pszFile, int nLine ) CPL_WARN_UNUSED_RESULT;
#define VSI_MALLOC_ALIGNED_AUTO_VERBOSE( size ) VSIMallocAlignedAutoVerbose(size,__FILE__,__LINE__)

void CPL_DLL *VSIMalloc2( size_t nSize1, size_t nSize2 ) CPL_WARN_UNUSED_RESULT;

void CPL_DLL *VSIMalloc3( size_t nSize1, size_t nSize2, size_t nSize3 ) CPL_WARN_UNUSED_RESULT;

void CPL_DLL   *VSIMallocVerbose( size_t nSize, const char* pszFile, int nLine ) CPL_WARN_UNUSED_RESULT;
#define VSI_MALLOC_VERBOSE( size ) VSIMallocVerbose(size,__FILE__,__LINE__)

void CPL_DLL   *VSIMalloc2Verbose( size_t nSize1, size_t nSize2, const char* pszFile, int nLine ) CPL_WARN_UNUSED_RESULT;
#define VSI_MALLOC2_VERBOSE( nSize1, nSize2 ) VSIMalloc2Verbose(nSize1,nSize2,__FILE__,__LINE__)

void CPL_DLL   *VSIMalloc3Verbose( size_t nSize1, size_t nSize2, size_t nSize3, const char* pszFile, int nLine ) CPL_WARN_UNUSED_RESULT;
#define VSI_MALLOC3_VERBOSE( nSize1, nSize2, nSize3 ) VSIMalloc3Verbose(nSize1,nSize2,nSize3,__FILE__,__LINE__)

void CPL_DLL   *VSICallocVerbose(  size_t nCount, size_t nSize, const char* pszFile, int nLine ) CPL_WARN_UNUSED_RESULT;
#define VSI_CALLOC_VERBOSE( nCount, nSize ) VSICallocVerbose(nCount,nSize,__FILE__,__LINE__)

void CPL_DLL   *VSIReallocVerbose(  void* pOldPtr, size_t nNewSize, const char* pszFile, int nLine ) CPL_WARN_UNUSED_RESULT;
#define VSI_REALLOC_VERBOSE( pOldPtr, nNewSize ) VSIReallocVerbose(pOldPtr,nNewSize,__FILE__,__LINE__)

char CPL_DLL   *VSIStrdupVerbose(  const char* pszStr, const char* pszFile, int nLine ) CPL_WARN_UNUSED_RESULT;
#define VSI_STRDUP_VERBOSE( pszStr ) VSIStrdupVerbose(pszStr,__FILE__,__LINE__)

GIntBig CPL_DLL CPLGetPhysicalRAM(void);
GIntBig CPL_DLL CPLGetUsablePhysicalRAM(void);

/* ==================================================================== */
/*      Other...                                                        */
/* ==================================================================== */

#define CPLReadDir VSIReadDir
char CPL_DLL **VSIReadDir( const char * );
char CPL_DLL **VSIReadDirRecursive( const char *pszPath );
char CPL_DLL **VSIReadDirEx( const char *pszPath, int nMaxFiles );

typedef struct VSIDIR VSIDIR;

VSIDIR CPL_DLL *VSIOpenDir( const char *pszPath,
                            int nRecurseDepth,
                            const char* const *papszOptions);

typedef struct VSIDIREntry
{
    char*        pszName;
    int          nMode;
    vsi_l_offset nSize;
    GIntBig      nMTime;
    char         bModeKnown;
    char         bSizeKnown;
    char         bMTimeKnown;
    char**       papszExtra;

#ifdef __cplusplus

    VSIDIREntry();
    ~VSIDIREntry();
    VSIDIREntry(const VSIDIREntry&) = delete;
    VSIDIREntry& operator=(VSIDIREntry&) = delete;
#endif
} VSIDIREntry;

const VSIDIREntry CPL_DLL *VSIGetNextDirEntry(VSIDIR* dir);
void CPL_DLL VSICloseDir(VSIDIR* dir);

int CPL_DLL VSIMkdir( const char * pszPathname, long mode );
int CPL_DLL VSIMkdirRecursive( const char * pszPathname, long mode );
int CPL_DLL VSIRmdir( const char * pszDirname );
int CPL_DLL VSIRmdirRecursive( const char * pszDirname );
int CPL_DLL VSIUnlink( const char * pszFilename );
int CPL_DLL VSIRename( const char * oldpath, const char * newpath );
int CPL_DLL VSISync( const char* pszSource, const char* pszTarget,
                      const char* const * papszOptions,
                      GDALProgressFunc pProgressFunc,
                      void *pProgressData,
                      char*** ppapszOutputs );

char CPL_DLL *VSIStrerror( int );
GIntBig CPL_DLL VSIGetDiskFreeSpace(const char *pszDirname);

/* ==================================================================== */
/*      Install special file access handlers.                           */
/* ==================================================================== */
void CPL_DLL VSIInstallMemFileHandler(void);
void CPL_DLL VSIInstallLargeFileHandler(void);
void CPL_DLL VSIInstallSubFileHandler(void);
void VSIInstallCurlFileHandler(void);
void CPL_DLL VSICurlClearCache(void);
void CPL_DLL VSICurlPartialClearCache(const char* pszFilenamePrefix);
void VSIInstallCurlStreamingFileHandler(void);
void VSIInstallS3FileHandler(void);
void VSIInstallS3StreamingFileHandler(void);
void VSIInstallGSFileHandler(void);
void VSIInstallGSStreamingFileHandler(void);
void VSIInstallAzureFileHandler(void);
void VSIInstallAzureStreamingFileHandler(void);
void VSIInstallOSSFileHandler(void);
void VSIInstallOSSStreamingFileHandler(void);
void VSIInstallSwiftFileHandler(void);
void VSIInstallSwiftStreamingFileHandler(void);
void VSIInstallGZipFileHandler(void); /* No reason to export that */
void VSIInstallZipFileHandler(void); /* No reason to export that */
void VSIInstallStdinHandler(void); /* No reason to export that */
void VSIInstallHdfsHandler(void); /* No reason to export that */
void VSIInstallWebHdfsHandler(void); /* No reason to export that */
void VSIInstallStdoutHandler(void); /* No reason to export that */
void CPL_DLL VSIInstallSparseFileHandler(void);
void VSIInstallTarFileHandler(void); /* No reason to export that */
void CPL_DLL VSIInstallCryptFileHandler(void);
void CPL_DLL VSISetCryptKey(const GByte* pabyKey, int nKeySize);
void CPL_DLL VSICleanupFileManager(void);
VSILFILE CPL_DLL *VSIFileFromMemBuffer( const char *pszFilename,
                                    GByte *pabyData,
                                    vsi_l_offset nDataLength,
                                    int bTakeOwnership ) CPL_WARN_UNUSED_RESULT;
GByte CPL_DLL *VSIGetMemFileBuffer( const char *pszFilename,
                                    vsi_l_offset *pnDataLength,
                                    int bUnlinkAndSeize );

typedef size_t (*VSIWriteFunction)(const void* ptr, size_t size, size_t nmemb, FILE* stream);
void CPL_DLL VSIStdoutSetRedirection( VSIWriteFunction pFct, FILE* stream );

/* ==================================================================== */
/*      Time querying.                                                  */
/* ==================================================================== */

unsigned long CPL_DLL VSITime( unsigned long * );
const char CPL_DLL *VSICTime( unsigned long );
struct tm CPL_DLL *VSIGMTime( const time_t *pnTime,
                              struct tm *poBrokenTime );
struct tm CPL_DLL *VSILocalTime( const time_t *pnTime,
                                 struct tm *poBrokenTime );
/* -------------------------------------------------------------------- */
/*      the following can be turned on for detailed logging of          */
/*      almost all IO calls.                                            */
/* -------------------------------------------------------------------- */
#ifdef VSI_DEBUG

#ifndef DEBUG
#  define DEBUG
#endif

#include "cpl_error.h"

#define VSIDebug4(f,a1,a2,a3,a4)   CPLDebug( "VSI", f, a1, a2, a3, a4 );
#define VSIDebug3( f, a1, a2, a3 ) CPLDebug( "VSI", f, a1, a2, a3 );
#define VSIDebug2( f, a1, a2 )     CPLDebug( "VSI", f, a1, a2 );
#define VSIDebug1( f, a1 )         CPLDebug( "VSI", f, a1 );
#else
#define VSIDebug4( f, a1, a2, a3, a4 ) {}
#define VSIDebug3( f, a1, a2, a3 ) {}
#define VSIDebug2( f, a1, a2 )     {}
#define VSIDebug1( f, a1 )         {}
#endif

CPL_C_END

#endif /* ndef CPL_VSI_H_INCLUDED */