forked from lino/radar-wp
97 lines
2.3 KiB
PHP
97 lines
2.3 KiB
PHP
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<?php
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/**
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* EWKB (Extended Well Known Binary) Adapter
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*/
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class EWKB extends WKB
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{
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/**
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* Read WKB binary string into geometry objects
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*
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* @param string $wkb An Extended-WKB binary string
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*
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* @return Geometry
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*/
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public function read($wkb, $is_hex_string = FALSE) {
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if ($is_hex_string) {
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$wkb = pack('H*',$wkb);
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}
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// Open the wkb up in memory so we can examine the SRID
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$mem = fopen('php://memory', 'r+');
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fwrite($mem, $wkb);
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fseek($mem, 0);
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$base_info = unpack("corder/ctype/cz/cm/cs", fread($mem, 5));
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if ($base_info['s']) {
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$srid = current(unpack("Lsrid", fread($mem, 4)));
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}
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else {
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$srid = NULL;
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}
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fclose($mem);
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// Run the wkb through the normal WKB reader to get the geometry
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$wkb_reader = new WKB();
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$geom = $wkb_reader->read($wkb);
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// If there is an SRID, add it to the geometry
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if ($srid) {
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$geom->setSRID($srid);
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}
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return $geom;
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}
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/**
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* Serialize geometries into an EWKB binary string.
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*
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* @param Geometry $geometry
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*
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* @return string The Extended-WKB binary string representation of the input geometries
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*/
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public function write(Geometry $geometry, $write_as_hex = FALSE) {
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// We always write into NDR (little endian)
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$wkb = pack('c',1);
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switch ($geometry->getGeomType()) {
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case 'Point';
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$wkb .= pack('L',1);
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$wkb .= $this->writePoint($geometry);
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break;
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case 'LineString';
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$wkb .= pack('L',2);
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$wkb .= $this->writeLineString($geometry);
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break;
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case 'Polygon';
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$wkb .= pack('L',3);
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$wkb .= $this->writePolygon($geometry);
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break;
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case 'MultiPoint';
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$wkb .= pack('L',4);
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$wkb .= $this->writeMulti($geometry);
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break;
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case 'MultiLineString';
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$wkb .= pack('L',5);
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$wkb .= $this->writeMulti($geometry);
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break;
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case 'MultiPolygon';
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$wkb .= pack('L',6);
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$wkb .= $this->writeMulti($geometry);
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break;
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case 'GeometryCollection';
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$wkb .= pack('L',7);
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$wkb .= $this->writeMulti($geometry);
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break;
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}
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if ($write_as_hex) {
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$unpacked = unpack('H*',$wkb);
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return $unpacked[1];
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}
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else {
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return $wkb;
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}
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}
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}
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