SHPWriteHeader()

void SHPAPI_CALL SHPWriteHeader

(

SHPHandle

hSHP

)

Definition at line 147 of file shpopen.c.

{
    uchar       abyHeader[100] = { 0 };
    int         i;
    int32       i32;
    double      dValue;
    int32       *panSHX;
 
    if (psSHP->fpSHX == SHPLIB_NULLPTR)
    {
        psSHP->sHooks.Error( "SHPWriteHeader failed : SHX file is closed");
        return;
    }
 
/* -------------------------------------------------------------------- */
/*      Prepare header block for .shp file.                             */
/* -------------------------------------------------------------------- */
 
    abyHeader[2] = 0x27;                                /* magic cookie */
    abyHeader[3] = 0x0a;
 
    i32 = psSHP->nFileSize/2;                           /* file size */
    ByteCopy( &i32, abyHeader+24, 4 );
    if( !bBigEndian ) SwapWord( 4, abyHeader+24 );
 
    i32 = 1000;                                         /* version */
    ByteCopy( &i32, abyHeader+28, 4 );
    if( bBigEndian ) SwapWord( 4, abyHeader+28 );
 
    i32 = psSHP->nShapeType;                            /* shape type */
    ByteCopy( &i32, abyHeader+32, 4 );
    if( bBigEndian ) SwapWord( 4, abyHeader+32 );
 
    dValue = psSHP->adBoundsMin[0];                     /* set bounds */
    ByteCopy( &dValue, abyHeader+36, 8 );
    if( bBigEndian ) SwapWord( 8, abyHeader+36 );
 
    dValue = psSHP->adBoundsMin[1];
    ByteCopy( &dValue, abyHeader+44, 8 );
    if( bBigEndian ) SwapWord( 8, abyHeader+44 );
 
    dValue = psSHP->adBoundsMax[0];
    ByteCopy( &dValue, abyHeader+52, 8 );
    if( bBigEndian ) SwapWord( 8, abyHeader+52 );
 
    dValue = psSHP->adBoundsMax[1];
    ByteCopy( &dValue, abyHeader+60, 8 );
    if( bBigEndian ) SwapWord( 8, abyHeader+60 );
 
    dValue = psSHP->adBoundsMin[2];                     /* z */
    ByteCopy( &dValue, abyHeader+68, 8 );
    if( bBigEndian ) SwapWord( 8, abyHeader+68 );
 
    dValue = psSHP->adBoundsMax[2];
    ByteCopy( &dValue, abyHeader+76, 8 );
    if( bBigEndian ) SwapWord( 8, abyHeader+76 );
 
    dValue = psSHP->adBoundsMin[3];                     /* m */
    ByteCopy( &dValue, abyHeader+84, 8 );
    if( bBigEndian ) SwapWord( 8, abyHeader+84 );
 
    dValue = psSHP->adBoundsMax[3];
    ByteCopy( &dValue, abyHeader+92, 8 );
    if( bBigEndian ) SwapWord( 8, abyHeader+92 );
 
/* -------------------------------------------------------------------- */
/*      Write .shp file header.                                         */
/* -------------------------------------------------------------------- */
    if( psSHP->sHooks.FSeek( psSHP->fpSHP, 0, 0 ) != 0
        || psSHP->sHooks.FWrite( abyHeader, 100, 1, psSHP->fpSHP ) != 1 )
    {
        char szErrorMsg[200];
 
        snprintf( szErrorMsg, sizeof(szErrorMsg),
                 "Failure writing .shp header: %s", strerror(errno) );
        szErrorMsg[sizeof(szErrorMsg)-1] = '\0';
        psSHP->sHooks.Error( szErrorMsg );
        return;
    }
 
/* -------------------------------------------------------------------- */
/*      Prepare, and write .shx file header.                            */
/* -------------------------------------------------------------------- */
    i32 = (psSHP->nRecords * 2 * sizeof(int32) + 100)/2;   /* file size */
    ByteCopy( &i32, abyHeader+24, 4 );
    if( !bBigEndian ) SwapWord( 4, abyHeader+24 );
 
    if( psSHP->sHooks.FSeek( psSHP->fpSHX, 0, 0 ) != 0
        || psSHP->sHooks.FWrite( abyHeader, 100, 1, psSHP->fpSHX ) != 1 )
    {
        char szErrorMsg[200];
 
        snprintf( szErrorMsg, sizeof(szErrorMsg),
                 "Failure writing .shx header: %s", strerror(errno) );
        szErrorMsg[sizeof(szErrorMsg)-1] = '\0';
        psSHP->sHooks.Error( szErrorMsg );
 
        return;
    }
 
/* -------------------------------------------------------------------- */
/*      Write out the .shx contents.                                    */
/* -------------------------------------------------------------------- */
    panSHX = STATIC_CAST(int32 *, malloc(sizeof(int32) * 2 * psSHP->nRecords));
    if( panSHX == SHPLIB_NULLPTR )
    {
        psSHP->sHooks.Error( "Failure allocating panSHX" );
        return;
    }
 
    for( i = 0; i < psSHP->nRecords; i++ )
    {
        panSHX[i*2  ] = psSHP->panRecOffset[i]/2;
        panSHX[i*2+1] = psSHP->panRecSize[i]/2;
        if( !bBigEndian ) SwapWord( 4, panSHX+i*2 );
        if( !bBigEndian ) SwapWord( 4, panSHX+i*2+1 );
    }
 
    if( STATIC_CAST(int, psSHP->sHooks.FWrite( panSHX, sizeof(int32)*2, psSHP->nRecords, psSHP->fpSHX ))
        != psSHP->nRecords )
    {
        char szErrorMsg[200];
 
        snprintf( szErrorMsg, sizeof(szErrorMsg),
                 "Failure writing .shx contents: %s", strerror(errno) );
        szErrorMsg[sizeof(szErrorMsg)-1] = '\0';
        psSHP->sHooks.Error( szErrorMsg );
    }
 
    free( panSHX );
 
/* -------------------------------------------------------------------- */
/*      Flush to disk.                                                  */
/* -------------------------------------------------------------------- */
    psSHP->sHooks.FFlush( psSHP->fpSHP );
    psSHP->sHooks.FFlush( psSHP->fpSHX );
}

References SHPInfo::adBoundsMax, SHPInfo::adBoundsMin, bBigEndian, ByteCopy, SAHooks::Error, SAHooks::FFlush, SHPInfo::fpSHP, SHPInfo::fpSHX, free(), SAHooks::FSeek, SAHooks::FWrite, malloc(), SHPInfo::nFileSize, SHPInfo::nRecords, SHPInfo::nShapeType, SHPInfo::panRecOffset, SHPInfo::panRecSize, SHPInfo::sHooks, SHPLIB_NULLPTR, STATIC_CAST, and SwapWord().

Referenced by SHPClose().

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