DBFOpenLL()

DBFHandle SHPAPI_CALL DBFOpenLL	(	const char *	pszFilename,
		const char *	pszAccess,
		SAHooks *	psHooks
	)

Definition at line 388 of file dbfopen.c.

{
    DBFHandle           psDBF;
    SAFile              pfCPG;
    unsigned char       *pabyBuf;
    int                 nFields, nHeadLen, iField;
    char                *pszFullname;
    int                 nBufSize = 500;
    int                 nLenWithoutExtension;
 
/* -------------------------------------------------------------------- */
/*      We only allow the access strings "rb" and "r+".                  */
/* -------------------------------------------------------------------- */
    if( strcmp(pszAccess,"r") != 0 && strcmp(pszAccess,"r+") != 0
        && strcmp(pszAccess,"rb") != 0 && strcmp(pszAccess,"rb+") != 0
        && strcmp(pszAccess,"r+b") != 0 )
        return SHPLIB_NULLPTR;
 
    if( strcmp(pszAccess,"r") == 0 )
        pszAccess = "rb";
 
    if( strcmp(pszAccess,"r+") == 0 )
        pszAccess = "rb+";
 
/* -------------------------------------------------------------------- */
/*      Compute the base (layer) name.  If there is any extension       */
/*      on the passed in filename we will strip it off.                 */
/* -------------------------------------------------------------------- */
    nLenWithoutExtension = DBFGetLenWithoutExtension(pszFilename);
    pszFullname = STATIC_CAST(char *, malloc(nLenWithoutExtension + 5));
    if( pszFullname == SHPLIB_NULLPTR )
        return SHPLIB_NULLPTR;
    memcpy(pszFullname, pszFilename, nLenWithoutExtension);
    memcpy(pszFullname + nLenWithoutExtension, ".dbf", 5);
 
    psDBF = STATIC_CAST(DBFHandle, calloc( 1, sizeof(DBFInfo) ));
    if( psDBF == SHPLIB_NULLPTR )
    {
        free( pszFullname );
        return SHPLIB_NULLPTR;
    }
    psDBF->fp = psHooks->FOpen( pszFullname, pszAccess );
    memcpy( &(psDBF->sHooks), psHooks, sizeof(SAHooks) );
 
    if( psDBF->fp == SHPLIB_NULLPTR )
    {
        memcpy(pszFullname + nLenWithoutExtension, ".DBF", 5);
        psDBF->fp = psDBF->sHooks.FOpen(pszFullname, pszAccess );
    }
 
    memcpy(pszFullname + nLenWithoutExtension, ".cpg", 5);
    pfCPG = psHooks->FOpen( pszFullname, "r" );
    if( pfCPG == SHPLIB_NULLPTR )
    {
        memcpy(pszFullname + nLenWithoutExtension, ".CPG", 5);
        pfCPG = psHooks->FOpen( pszFullname, "r" );
    }
 
    free( pszFullname );
 
    if( psDBF->fp == SHPLIB_NULLPTR )
    {
        free( psDBF );
        if( pfCPG ) psHooks->FClose( pfCPG );
        return SHPLIB_NULLPTR;
    }
 
    psDBF->bNoHeader = FALSE;
    psDBF->nCurrentRecord = -1;
    psDBF->bCurrentRecordModified = FALSE;
 
/* -------------------------------------------------------------------- */
/*  Read Table Header info                                              */
/* -------------------------------------------------------------------- */
    pabyBuf = STATIC_CAST(unsigned char *, malloc(nBufSize));
    if( psDBF->sHooks.FRead( pabyBuf, XBASE_FILEHDR_SZ, 1, psDBF->fp ) != 1 )
    {
        psDBF->sHooks.FClose( psDBF->fp );
        if( pfCPG ) psDBF->sHooks.FClose( pfCPG );
        free( pabyBuf );
        free( psDBF );
        return SHPLIB_NULLPTR;
    }
 
    DBFSetLastModifiedDate(psDBF, pabyBuf[1], pabyBuf[2], pabyBuf[3]);
 
    psDBF->nRecords =
     pabyBuf[4]|(pabyBuf[5]<<8)|(pabyBuf[6]<<16)|((pabyBuf[7]&0x7f)<<24);
 
    psDBF->nHeaderLength = nHeadLen = pabyBuf[8]|(pabyBuf[9]<<8);
    psDBF->nRecordLength = pabyBuf[10]|(pabyBuf[11]<<8);
    psDBF->iLanguageDriver = pabyBuf[29];
 
    if (psDBF->nRecordLength == 0 || nHeadLen < XBASE_FILEHDR_SZ)
    {
        psDBF->sHooks.FClose( psDBF->fp );
        if( pfCPG ) psDBF->sHooks.FClose( pfCPG );
        free( pabyBuf );
        free( psDBF );
        return SHPLIB_NULLPTR;
    }
 
    psDBF->nFields = nFields = (nHeadLen - XBASE_FILEHDR_SZ) / XBASE_FLDHDR_SZ;
 
    /* coverity[tainted_data] */
    psDBF->pszCurrentRecord = STATIC_CAST(char *, malloc(psDBF->nRecordLength));
 
/* -------------------------------------------------------------------- */
/*  Figure out the code page from the LDID and CPG                      */
/* -------------------------------------------------------------------- */
 
    psDBF->pszCodePage = SHPLIB_NULLPTR;
    if( pfCPG )
    {
        size_t n;
        memset( pabyBuf, 0, nBufSize);
        psDBF->sHooks.FRead( pabyBuf, nBufSize - 1, 1, pfCPG );
        n = strcspn( REINTERPRET_CAST(char *, pabyBuf), "\n\r" );
        if( n > 0 )
        {
            pabyBuf[n] = '\0';
            psDBF->pszCodePage = STATIC_CAST(char *, malloc(n + 1));
            memcpy( psDBF->pszCodePage, pabyBuf, n + 1 );
        }
                psDBF->sHooks.FClose( pfCPG );
    }
    if( psDBF->pszCodePage == SHPLIB_NULLPTR && pabyBuf[29] != 0 )
    {
        snprintf( REINTERPRET_CAST(char *, pabyBuf), nBufSize, "LDID/%d", psDBF->iLanguageDriver );
        psDBF->pszCodePage = STATIC_CAST(char *, malloc(strlen(REINTERPRET_CAST(char*, pabyBuf)) + 1));
        strcpy( psDBF->pszCodePage, REINTERPRET_CAST(char *, pabyBuf) );
    }
 
/* -------------------------------------------------------------------- */
/*  Read in Field Definitions                                           */
/* -------------------------------------------------------------------- */
 
    pabyBuf = STATIC_CAST(unsigned char *, SfRealloc(pabyBuf,nHeadLen));
    psDBF->pszHeader = REINTERPRET_CAST(char *, pabyBuf);
 
    psDBF->sHooks.FSeek( psDBF->fp, XBASE_FILEHDR_SZ, 0 );
    if( psDBF->sHooks.FRead( pabyBuf, nHeadLen-XBASE_FILEHDR_SZ, 1,
                             psDBF->fp ) != 1 )
    {
        psDBF->sHooks.FClose( psDBF->fp );
        free( pabyBuf );
        free( psDBF->pszCurrentRecord );
        free( psDBF->pszCodePage );
        free( psDBF );
        return SHPLIB_NULLPTR;
    }
 
    psDBF->panFieldOffset = STATIC_CAST(int *, malloc(sizeof(int) * nFields));
    psDBF->panFieldSize = STATIC_CAST(int *, malloc(sizeof(int) * nFields));
    psDBF->panFieldDecimals = STATIC_CAST(int *, malloc(sizeof(int) * nFields));
    psDBF->pachFieldType = STATIC_CAST(char *, malloc(sizeof(char) * nFields));
 
    for( iField = 0; iField < nFields; iField++ )
    {
        unsigned char           *pabyFInfo;
 
        pabyFInfo = pabyBuf+iField*XBASE_FLDHDR_SZ;
        if( pabyFInfo[0] == HEADER_RECORD_TERMINATOR )
        {
            psDBF->nFields = iField;
            break;
        }
 
        if( pabyFInfo[11] == 'N' || pabyFInfo[11] == 'F' )
        {
            psDBF->panFieldSize[iField] = pabyFInfo[16];
            psDBF->panFieldDecimals[iField] = pabyFInfo[17];
        }
        else
        {
            psDBF->panFieldSize[iField] = pabyFInfo[16];
            psDBF->panFieldDecimals[iField] = 0;
 
/*
** The following seemed to be used sometimes to handle files with long
** string fields, but in other cases (such as bug 1202) the decimals field
** just seems to indicate some sort of preferred formatting, not very
** wide fields.  So I have disabled this code.  FrankW.
            psDBF->panFieldSize[iField] = pabyFInfo[16] + pabyFInfo[17]*256;
            psDBF->panFieldDecimals[iField] = 0;
*/
        }
 
        psDBF->pachFieldType[iField] = STATIC_CAST(char, pabyFInfo[11]);
        if( iField == 0 )
            psDBF->panFieldOffset[iField] = 1;
        else
            psDBF->panFieldOffset[iField] =
              psDBF->panFieldOffset[iField-1] + psDBF->panFieldSize[iField-1];
    }
 
    /* Check that the total width of fields does not exceed the record width */
    if( psDBF->nFields > 0 &&
        psDBF->panFieldOffset[psDBF->nFields-1] +
            psDBF->panFieldSize[psDBF->nFields-1] > psDBF->nRecordLength )
    {
        DBFClose( psDBF );
        return SHPLIB_NULLPTR;
    }
 
    DBFSetWriteEndOfFileChar( psDBF, TRUE );
 
    psDBF->bRequireNextWriteSeek = TRUE;
 
    return( psDBF );
}

References DBFInfo::bCurrentRecordModified, DBFInfo::bNoHeader, DBFInfo::bRequireNextWriteSeek, DBFClose(), DBFGetLenWithoutExtension(), DBFSetLastModifiedDate(), DBFSetWriteEndOfFileChar(), FALSE, SAHooks::FClose, SAHooks::FOpen, DBFInfo::fp, SAHooks::FRead, free(), SAHooks::FSeek, HEADER_RECORD_TERMINATOR, DBFInfo::iLanguageDriver, malloc(), DBFInfo::nCurrentRecord, DBFInfo::nFields, DBFInfo::nHeaderLength, DBFInfo::nRecordLength, DBFInfo::nRecords, DBFInfo::pachFieldType, DBFInfo::panFieldDecimals, DBFInfo::panFieldOffset, DBFInfo::panFieldSize, DBFInfo::pszCodePage, DBFInfo::pszCurrentRecord, DBFInfo::pszHeader, REINTERPRET_CAST, SfRealloc(), DBFInfo::sHooks, SHPLIB_NULLPTR, STATIC_CAST, TRUE, XBASE_FILEHDR_SZ, and XBASE_FLDHDR_SZ.

Referenced by DBFOpen().

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