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<?php // $Id: geo.wkb.inc,v 1.10 2009/06/18 01:24:11 vauxia Exp $
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function geo_wkb_types($key = NULL) {
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$geo_types = array(
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1 => 'point',
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2 => 'linestring',
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3 => 'polygon',
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4 => 'multipoint',
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5 => 'multilinestring',
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6 => 'multipolygon',
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);
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if ($key) return $geo_types[$key];
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return $geo_types;
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}
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function _geo_wkb_get_data($wkb = NULL, $format = 'text', $fp = NULL, $type = NULL, $byte_order = NULL) {
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static $local_byte_order;
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if (!isset($local_byte_order)) {
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$local_byte_order = current(unpack('c', pack('S', 1)));
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}
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$data = array();
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if (!$fp) {
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if (empty($wkb)) return;
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// Put our WKB data into memory so we can cruise around with fread.
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$fp = fopen("php://memory", 'r+');
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fputs($fp, $wkb);
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fseek($fp, 0);
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// Fetch the byte order (0 = Big Endian, 1 = Little Endian) and geo type.
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$data = unpack('cbyte_order', fread($fp, 1));
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$byte_order = $data['byte_order'];
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$data = array_merge($data, unpack(($byte_order ? 'Vtype' : 'Ntype'), fread($fp, 4)));
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// Set the geometry type
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$data['type'] = geo_wkb_types($data['type']);
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}
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$func = 'geo_wkb_get_'. $format;
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if (!isset($type)) $type = $data['type'];
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switch($type) {
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case 'point': // Contains x, y decimal values.
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$tmp = fread($fp, 16);
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// Check whether the data's byte order matches the machine's byte order.
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// If not, we need to reverse the data before PHP can unpack it.
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if ($byte_order != $local_byte_order) {
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$tmp = strrev(substr($tmp, 0, 8)) . strrev(substr($tmp, 8));
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}
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$data = array_merge($data, unpack('dx/dy', $tmp));
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$data['value'] = $func($data);
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if (function_exists($post = $func .'_post')) $data = $post($data);
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return $data;
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case 'linestring': // Contains count * (point) values.
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$data['count'] = current(unpack(($byte_order ? 'V' : 'N'), fread($fp, 4)));
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for ($i = 1; $i <= $data['count']; $i++) {
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$point = _geo_wkb_get_data(NULL, $format, $fp, 'point', $byte_order);
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$data['value'] = $func($point, $data['value']);
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}
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if (function_exists($post = $func .'_post')) $data = $post($data);
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return $data;
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case 'polygon': // Contains count * (linestring) items.
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$data['count'] = current(unpack(($byte_order ? 'V' : 'N'), fread($fp, 4)));
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for ($i = 1; $i <= $data['count']; $i++) {
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$line = _geo_wkb_get_data(NULL, $format, $fp, 'linestring', $byte_order);
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$data['value'] = $func($line, $data['value']);
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}
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if (function_exists($post = $func .'_post')) $data = $post($data);
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return $data;
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}
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}
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/**
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* WKT format.
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*/
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function geo_wkb_get_wkt($data, $items = NULL) {
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$out = '';
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if (isset($data['x']) && isset($data['y'])) {
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$out = $data['x'] .' '. $data['y'];
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if (isset($data['z'])) $out .= ' '. $data['z'];
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}
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elseif (isset($data['value'])) {
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$out = $data['value'];
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}
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if (isset($items)) {
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return $items .= ', '. $out;
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}
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return $out;
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}
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function geo_wkb_get_wkt_post($data) {
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if (isset($data['value'])) {
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$value = '';
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if (isset($data['type'])) $value = strtoupper($data['type']);
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$data['value'] = $value .'('. $data['value'] .')';
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}
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return $data;
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}
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/**
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* Text format is suitable for many outputs, such as SVG, GeoRSS, etc.
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*/
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function geo_wkb_get_text($data, $items = NULL) {
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$out = '';
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if (isset($data['x']) && isset($data['y'])) {
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$out = $data['y'] .' '. $data['x'];
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if (isset($data['z'])) $out .= ' '. $data['z'];
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}
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elseif (isset($data['value'])) {
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$out = $data['value'];
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}
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if (isset($items)) {
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return $items .= ' '. $out;
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}
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return $out;
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}
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/**
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* Array, in case that's all you wanted.
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*/
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function geo_wkb_get_array($data, $items = NULL) {
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if (isset($data['x']) && isset($data['y'])) {
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$ret = array('lon' => $data['x'], 'lat' => $data['y']);
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}
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elseif (isset($data['value'])) {
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$ret = $data['value'];
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}
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if (isset($items)) {
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return array_merge($items, array($ret));
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}
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return array($ret);
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}
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function geo_wkb_get_array_post($data, $items = NULL) {
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if ($data['type'] == 'point') {
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$data['value'] = $data['value'][0];
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$data['lat'] = $data['value']['lat'];
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$data['lon'] = $data['value']['lon'];
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}
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return $data;
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}
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/**
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* KML format.
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* It's actually the same thing as WKT with no post-process.
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*/
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function geo_wkb_get_kml($data, $items = NULL) {
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$out = '';
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if (isset($data['x']) && isset($data['y'])) {
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$out = $data['x'] .','. $data['y'];
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if (isset($data['z'])) $out .= ','. $data['z'];
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}
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elseif (isset($data['value'])) {
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$out = $data['value'];
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}
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if (isset($items)) {
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return $items .= "\n". $out;
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}
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return $out;
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}
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