DBFGetCodePage()

const char SHPAPI_CALL1* DBFGetCodePage

(

DBFHandle

psDBF

)

Definition at line 1799 of file dbfopen.c.

References DBFDeleteField(), DBFFlushRecord(), DBFUpdateHeader(), FALSE, free(), malloc(), SfRealloc(), SHPAPI_CALL, and TRUE.

{
    if( psDBF == NULL )
        return NULL;
    return psDBF->pszCodePage;
}

/************************************************************************/
/*                          DBFDeleteField()                            */
/*                                                                      */
/*      Remove a field from a .dbf file                                 */
/************************************************************************/

int SHPAPI_CALL
DBFDeleteField(DBFHandle psDBF, int iField)
{
    int nOldRecordLength, nOldHeaderLength;
    int nDeletedFieldOffset, nDeletedFieldSize;
    SAOffset nRecordOffset;
    char* pszRecord;
    int i, iRecord;

    if (iField < 0 || iField >= psDBF->nFields)
        return FALSE;

    /* make sure that everything is written in .dbf */
    if( !DBFFlushRecord( psDBF ) )
        return FALSE;

    /* get information about field to be deleted */
    nOldRecordLength = psDBF->nRecordLength;
    nOldHeaderLength = psDBF->nHeaderLength;
    nDeletedFieldOffset = psDBF->panFieldOffset[iField];
    nDeletedFieldSize = psDBF->panFieldSize[iField];

    /* update fields info */
    for (i = iField + 1; i < psDBF->nFields; i++)
    {
        psDBF->panFieldOffset[i-1] = psDBF->panFieldOffset[i] - nDeletedFieldSize;
        psDBF->panFieldSize[i-1] = psDBF->panFieldSize[i];
        psDBF->panFieldDecimals[i-1] = psDBF->panFieldDecimals[i];
        psDBF->pachFieldType[i-1] = psDBF->pachFieldType[i];
    }

    /* resize fields arrays */
    psDBF->nFields--;

    psDBF->panFieldOffset = (int *)
        SfRealloc( psDBF->panFieldOffset, sizeof(int) * psDBF->nFields );

    psDBF->panFieldSize = (int *)
        SfRealloc( psDBF->panFieldSize, sizeof(int) * psDBF->nFields );

    psDBF->panFieldDecimals = (int *)
        SfRealloc( psDBF->panFieldDecimals, sizeof(int) * psDBF->nFields );

    psDBF->pachFieldType = (char *)
        SfRealloc( psDBF->pachFieldType, sizeof(char) * psDBF->nFields );

    /* update header information */
    psDBF->nHeaderLength -= 32;
    psDBF->nRecordLength -= nDeletedFieldSize;

    /* overwrite field information in header */
    memmove(psDBF->pszHeader + iField*32,
           psDBF->pszHeader + (iField+1)*32,
           sizeof(char) * (psDBF->nFields - iField)*32);

    psDBF->pszHeader = (char *) SfRealloc(psDBF->pszHeader,psDBF->nFields*32);

    /* update size of current record appropriately */
    psDBF->pszCurrentRecord = (char *) SfRealloc(psDBF->pszCurrentRecord,
                                                 psDBF->nRecordLength);

    /* we're done if we're dealing with not yet created .dbf */
    if ( psDBF->bNoHeader && psDBF->nRecords == 0 )
        return TRUE;

    /* force update of header with new header and record length */
    psDBF->bNoHeader = TRUE;
    DBFUpdateHeader( psDBF );

    /* alloc record */
    pszRecord = (char *) malloc(sizeof(char) * nOldRecordLength);

    /* shift records to their new positions */
    for (iRecord = 0; iRecord < psDBF->nRecords; iRecord++)
    {
        nRecordOffset =
            nOldRecordLength * (SAOffset) iRecord + nOldHeaderLength;

        /* load record */
        psDBF->sHooks.FSeek( psDBF->fp, nRecordOffset, 0 );
        psDBF->sHooks.FRead( pszRecord, nOldRecordLength, 1, psDBF->fp );

        nRecordOffset =
            psDBF->nRecordLength * (SAOffset) iRecord + psDBF->nHeaderLength;

        /* move record in two steps */
        psDBF->sHooks.FSeek( psDBF->fp, nRecordOffset, 0 );
        psDBF->sHooks.FWrite( pszRecord, nDeletedFieldOffset, 1, psDBF->fp );
        psDBF->sHooks.FWrite( pszRecord + nDeletedFieldOffset + nDeletedFieldSize,
                              nOldRecordLength - nDeletedFieldOffset - nDeletedFieldSize,
                              1, psDBF->fp );

    }

    /* TODO: truncate file */

    /* free record */
    free(pszRecord);

    psDBF->nCurrentRecord = -1;
    psDBF->bCurrentRecordModified = FALSE;

    return TRUE;
}

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