SHPReadObject()

SHPObject SHPAPI_CALL1 * SHPReadObject	(	SHPHandle	hSHP,
		int	iShape
	)

Definition at line 1841 of file shpopen.c.

{
    int                  nEntitySize, nRequiredSize;
    SHPObject           *psShape;
    char                 szErrorMsg[160];
    int                  nSHPType;
    int                  nBytesRead;
 
/* -------------------------------------------------------------------- */
/*      Validate the record/entity number.                              */
/* -------------------------------------------------------------------- */
    if( hEntity < 0 || hEntity >= psSHP->nRecords )
        return SHPLIB_NULLPTR;
 
/* -------------------------------------------------------------------- */
/*      Read offset/length from SHX loading if necessary.               */
/* -------------------------------------------------------------------- */
    if( psSHP->panRecOffset[hEntity] == 0 && psSHP->fpSHX != SHPLIB_NULLPTR )
    {
        unsigned int       nOffset, nLength;
 
        if( psSHP->sHooks.FSeek( psSHP->fpSHX, 100 + 8 * hEntity, 0 ) != 0 ||
            psSHP->sHooks.FRead( &nOffset, 1, 4, psSHP->fpSHX ) != 4 ||
            psSHP->sHooks.FRead( &nLength, 1, 4, psSHP->fpSHX ) != 4 )
        {
            char str[128];
            snprintf( str, sizeof(str),
                    "Error in fseek()/fread() reading object from .shx file at offset %d",
                    100 + 8 * hEntity);
            str[sizeof(str)-1] = '\0';
 
            psSHP->sHooks.Error( str );
            return SHPLIB_NULLPTR;
        }
        if( !bBigEndian ) SwapWord( 4, &nOffset );
        if( !bBigEndian ) SwapWord( 4, &nLength );
 
        if( nOffset > STATIC_CAST(unsigned int, INT_MAX) )
        {
            char str[128];
            snprintf( str, sizeof(str),
                    "Invalid offset for entity %d", hEntity);
            str[sizeof(str)-1] = '\0';
 
            psSHP->sHooks.Error( str );
            return SHPLIB_NULLPTR;
        }
        if( nLength > STATIC_CAST(unsigned int, INT_MAX / 2 - 4) )
        {
            char str[128];
            snprintf( str, sizeof(str),
                    "Invalid length for entity %d", hEntity);
            str[sizeof(str)-1] = '\0';
 
            psSHP->sHooks.Error( str );
            return SHPLIB_NULLPTR;
        }
 
        psSHP->panRecOffset[hEntity] = nOffset*2;
        psSHP->panRecSize[hEntity] = nLength*2;
    }

References bBigEndian, nBytesRead, nEntitySize, nSHPType, psShape, SHPLIB_NULLPTR, STATIC_CAST, str, and SwapWord().

Referenced by ShpLoaderGenerateSQLRowStatement(), and ShpLoaderOpenShape().

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