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#!/usr/local/bin/php –q
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<?php
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function getmercator($sx,$sy,$ex,$ey) {
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$sx = $sx*6371000.0*M_PI/180;
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$sy = log(tan(M_PI_4+$sy*M_PI/360))*6371000.0;
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$ex = $ex*6371000.0*M_PI/180;
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$ey = log(tan(M_PI_4+$ey*M_PI/360))*6371000.0;
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return array(
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'l' => array(
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'x' => $sx,
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'y' => $sy
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),
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'h' => array(
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'x' => $ex,
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'y' => $ey
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)
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);
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}
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function contains_bbox($c, &$r) {
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if ($c['l']['x'] > $r['h']['x'])
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return false;
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elseif ($c['h']['x'] < $r['l']['x'])
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return false;
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elseif ($c['l']['y'] > $r['h']['y'])
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return false;
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elseif ($c['h']['y'] < $r['l']['y'])
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return false;
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else
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return true;
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}
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$fetch_bbox = getmercator(11.3, 47.9, 11.4, 48.0);
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$files = array();
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$files['input'] = '/home/burner/carputer/navit/src/maps/osm_bbox_11.3,47.9,11.7,48.2.bin';
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$files['output'] = 'myarea.bin';
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$formats = array();
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$formats['ziphpack'] = "lssssslLLSS";
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$formats['zipheader'] = "l" . "ziplocsig"; # Signature (is always the same)
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$formats['zipheader'] .= "/s" . "zipver"; # zip version needed
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$formats['zipheader'] .= "/s" . "zipgenfld";# type of os that generated the file
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$formats['zipheader'] .= "/s" . "zipmthd"; #
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$formats['zipheader'] .= "/s" . "ziptime"; # time
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$formats['zipheader'] .= "/s" . "zipdate"; # date
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$formats['zipheader'] .= "/l" . "zipcrc"; # crc checksum
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$formats['zipheader'] .= "/L" . "zipsize"; # data size
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$formats['zipheader'] .= "/L" . "zipuncmp"; # uncompressed size
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$formats['zipheader'] .= "/S" . "zipfnln"; # length of filename
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$formats['zipheader'] .= "/S" . "zipxtraln";# length of extra data (always 0)
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$formats['zipcd'] = "".
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"i" . "zipcensig/".
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"c" . "zipcver/".
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"c" . "zipcos/".
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"c" . "zipcvxt/".
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"c" . "zipcexos/".
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"s" . "zipcflg/".
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"s" . "zipcmthd/".
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"s" . "ziptim/".
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"s" . "zipdat/".
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"i" . "zipccrc/".
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"I" . "zipcsiz/".
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"I" . "zipcunc/".
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"S" . "zipcfnl/".
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"S" . "zipcxtl/".
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"S" . "zipccml/".
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"S" . "zipdsk/".
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"S" . "zipint/".
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"I" . "zipext/".
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"I" . "zipofst/".
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$formats['zipcdpack'] = "iccccssssiIISSSSSII";
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$formats['zipcontent'] = "i5x/i5y/ii";
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$world_bbox = array();
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$world_bbox['l']['x'] = -20000000;
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$world_bbox['l']['y'] = -20000000;
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$world_bbox['h']['x'] = 20000000;
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$world_bbox['h']['y'] = 20000000;
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$fp = fopen($files['input'], 'r');
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$sp = fopen($files['output'], 'w');
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$files = array();
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$offset = 0;
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/**
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* Read through zipheaders
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*
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*/
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while (!feof($fp)) {
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$buffer = fread($fp, 30);
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$tileinfo = unpack($formats['zipheader'], $buffer);
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if ($tileinfo['zipfnln'] <= 0)
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break;
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$filename = fread($fp, $tileinfo['zipfnln']);
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$x=0;
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$done=false;
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$r = $world_bbox;
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while (!$done) {
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$c['x'] = floor( ($r['l']['x'] + $r['h']['x'])/2 );
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$c['y'] = floor( ($r['l']['y'] + $r['h']['y'])/2 );
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switch($filename[$x]) {
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case 'a':
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$r['l']['x'] = $c['x'];
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$r['l']['y'] = $c['y'];
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break;
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case 'b':
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$r['h']['x'] = $c['x'];
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$r['l']['y'] = $c['y'];
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break;
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case 'c':
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$r['l']['x'] = $c['x'];
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$r['h']['y'] = $c['y'];
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break;
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case 'd':
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$r['h']['x'] = $c['x'];
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$r['h']['y'] = $c['y'];
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break;
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default:
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$done=true;
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}
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$x++;
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}
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$tilecontent = fread($fp, $tileinfo['zipsize']);
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/* Area inside box, save it! */
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if (contains_bbox($fetch_bbox, $r)) {
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#echo "In box. ";
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#echo $filename . " ";
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$zipheader = $buffer;
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#echo "\n";
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/* Area outside of box, set zipcontent=0 */
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} else {
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$tileinfo['zipmthd'] = $tileinfo['zipcrc'] = $tileinfo['zipsize'] = $tileinfo['zipuncmp'] = 0;
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#echo "Out of box";
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$zipheader = $tileinfo;
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$tilecontent = '';
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$zipheader = pack($formats['ziphpack'],
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$tileinfo['ziplocsig'],
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$tileinfo['zipver'],
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$tileinfo['zipgenfld'],
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$tileinfo['zipmthd'],
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$tileinfo['ziptime'],
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$tileinfo['zipdate'],
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$tileinfo['zipcrc'],
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$tileinfo['zipsize'],
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$tileinfo['zipuncmp'],
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$tileinfo['zipfnln'],
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$tileinfo['zipxtraln']
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);
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}
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$put = $zipheader.$filename.$tilecontent;
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$files[$filename]['header'] = $tileinfo;
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$files[$filename]['size'] = strlen($put);
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$zipcd = array();
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$zipcd['zipcensig'] = 0x02014b50;
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$zipcd['zipcver'] = $tileinfo['zipver'];
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$zipcd['zipcos'] = 0x00;
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$zipcd['zipcvxt'] = 0x0a;
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$zipcd['zipcexos'] = 0x00;
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$zipcd['zipcflg'] = 0x00;
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$zipcd['zipcmthd'] = $tileinfo['zipmthd'];
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$zipcd['ziptim'] = $tileinfo['ziptime'];
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$zipcd['zipdat'] = $tileinfo['zipdate'];
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$zipcd['zipccrc'] = $tileinfo['zipcrc'];
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$zipcd['zipcsiz'] = $tileinfo['zipsize'];
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$zipcd['zipcunc'] = $tileinfo['zipuncmp'];
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$zipcd['zipcfnl'] = $tileinfo['zipfnln'];
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$zipcd['zipcxtl'] = 0x00;
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$zipcd['zipccml'] = 0x00;
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$zipcd['zipdsk'] = 0x00;
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$zipcd['zipint'] = 0x00;
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$zipcd['zipext'] = 0x00;
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$zipcd['zipofst'] = $offset;
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$zipcd_data .= pack($formats['zipcdpack'],
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$zipcd['zipcensig'],
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$zipcd['zipcver'],
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$zipcd['zipcos'],
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$zipcd['zipcvxt'],
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$zipcd['zipcexos'],
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$zipcd['zipcflg'],
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$zipcd['zipcmthd'],
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$zipcd['ziptim'],
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$zipcd['zipdat'],
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$zipcd['zipccrc'],
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$zipcd['zipcsiz'],
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$zipcd['zipcunc'],
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$zipcd['zipcfnl'],
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$zipcd['zipcxtl'],
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$zipcd['zipccml'],
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$zipcd['zipdsk'],
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$zipcd['zipint'],
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$zipcd['zipext'],
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$zipcd['zipofst']
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) . $filename;
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fwrite($sp, $put);
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$offset += strlen($put);
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}
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fwrite($sp, $zipcd_data);
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fclose($fp);
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fclose($sp);
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?>
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