GeoTIFF Test for Mapnik-Omnivore

testTiff.js

var fs = require('fs');
fs.open('CW.tif', 'r', function(err, fd) {
  var buf = new Buffer(100);
  fs.read(fd, buf, 0, 100, null, function(err, bytesRead, buffer) {
    var head = buffer.slice(0, 100).toString();
    if((head.slice(0,2).toString() === 'II' || head.slice(0,2).toString() == 'MM') && ((buffer[2] === 42) || buffer[3] === 42)) {
      console.log('file matches GeoTiff');
    } else {
      console.log('head-slice is ', head.slice(0,2).toString(), ' and buffer[2] equals ', buffer[2], ' and buffer[3] equals ', buffer[3]);
    }
  });
});