text: (function() {
  
      var debug = false;
  
      var root = this;
  
      var EXIF = function(obj) {
          if (obj instanceof EXIF) return obj;
          if (!(this instanceof EXIF)) return new EXIF(obj);
          this.EXIFwrapped = obj;
      };
  
      if (typeof exports !== 'undefined') {
          if (typeof module !== 'undefined' && module.exports) {
              exports = module.exports = EXIF;
          }
          exports.EXIF = EXIF;
      } else {
          root.EXIF = EXIF;
      }
  
      var ExifTags = EXIF.Tags = {
  
          // version tags
          0x9000 : "ExifVersion",             // EXIF version
          0xA000 : "FlashpixVersion",         // Flashpix format version
  
          // colorspace tags
          0xA001 : "ColorSpace",              // Color space information tag
  
          // image configuration
          0xA002 : "PixelXDimension",         // Valid width of meaningful image
          0xA003 : "PixelYDimension",         // Valid height of meaningful image
          0x9101 : "ComponentsConfiguration", // Information about channels
          0x9102 : "CompressedBitsPerPixel",  // Compressed bits per pixel
  
          // user information
          0x927C : "MakerNote",               // Any desired information written by the manufacturer
          0x9286 : "UserComment",             // Comments by user
  
          // related file
          0xA004 : "RelatedSoundFile",        // Name of related sound file
  
          // date and time
          0x9003 : "DateTimeOriginal",        // Date and time when the original image was generated
          0x9004 : "DateTimeDigitized",       // Date and time when the image was stored digitally
          0x9290 : "SubsecTime",              // Fractions of seconds for DateTime
          0x9291 : "SubsecTimeOriginal",      // Fractions of seconds for DateTimeOriginal
          0x9292 : "SubsecTimeDigitized",     // Fractions of seconds for DateTimeDigitized
  
          // picture-taking conditions
          0x829A : "ExposureTime",            // Exposure time (in seconds)
          0x829D : "FNumber",                 // F number
          0x8822 : "ExposureProgram",         // Exposure program
          0x8824 : "SpectralSensitivity",     // Spectral sensitivity
          0x8827 : "ISOSpeedRatings",         // ISO speed rating
          0x8828 : "OECF",                    // Optoelectric conversion factor
          0x9201 : "ShutterSpeedValue",       // Shutter speed
          0x9202 : "ApertureValue",           // Lens aperture
          0x9203 : "BrightnessValue",         // Value of brightness
          0x9204 : "ExposureBias",            // Exposure bias
          0x9205 : "MaxApertureValue",        // Smallest F number of lens
          0x9206 : "SubjectDistance",         // Distance to subject in meters
          0x9207 : "MeteringMode",            // Metering mode
          0x9208 : "LightSource",             // Kind of light source
          0x9209 : "Flash",                   // Flash status
          0x9214 : "SubjectArea",             // Location and area of main subject
          0x920A : "FocalLength",             // Focal length of the lens in mm
          0xA20B : "FlashEnergy",             // Strobe energy in BCPS
          0xA20C : "SpatialFrequencyResponse",    //
          0xA20E : "FocalPlaneXResolution",   // Number of pixels in width direction per FocalPlaneResolutionUnit
          0xA20F : "FocalPlaneYResolution",   // Number of pixels in height direction per FocalPlaneResolutionUnit
          0xA210 : "FocalPlaneResolutionUnit",    // Unit for measuring FocalPlaneXResolution and FocalPlaneYResolution
          0xA214 : "SubjectLocation",         // Location of subject in image
          0xA215 : "ExposureIndex",           // Exposure index selected on camera
          0xA217 : "SensingMethod",           // Image sensor type
          0xA300 : "FileSource",              // Image source (3 == DSC)
          0xA301 : "SceneType",               // Scene type (1 == directly photographed)
          0xA302 : "CFAPattern",              // Color filter array geometric pattern
          0xA401 : "CustomRendered",          // Special processing
          0xA402 : "ExposureMode",            // Exposure mode
          0xA403 : "WhiteBalance",            // 1 = auto white balance, 2 = manual
          0xA404 : "DigitalZoomRation",       // Digital zoom ratio
          0xA405 : "FocalLengthIn35mmFilm",   // Equivalent foacl length assuming 35mm film camera (in mm)
          0xA406 : "SceneCaptureType",        // Type of scene
          0xA407 : "GainControl",             // Degree of overall image gain adjustment
          0xA408 : "Contrast",                // Direction of contrast processing applied by camera
          0xA409 : "Saturation",              // Direction of saturation processing applied by camera
          0xA40A : "Sharpness",               // Direction of sharpness processing applied by camera
          0xA40B : "DeviceSettingDescription",    //
          0xA40C : "SubjectDistanceRange",    // Distance to subject
  
          // other tags
          0xA005 : "InteroperabilityIFDPointer",
          0xA420 : "ImageUniqueID"            // Identifier assigned uniquely to each image
      };
  
      var TiffTags = EXIF.TiffTags = {
          0x0100 : "ImageWidth",
          0x0101 : "ImageHeight",
          0x8769 : "ExifIFDPointer",
          0x8825 : "GPSInfoIFDPointer",
          0xA005 : "InteroperabilityIFDPointer",
          0x0102 : "BitsPerSample",
          0x0103 : "Compression",
          0x0106 : "PhotometricInterpretation",
          0x0112 : "Orientation",
          0x0115 : "SamplesPerPixel",
          0x011C : "PlanarConfiguration",
          0x0212 : "YCbCrSubSampling",
          0x0213 : "YCbCrPositioning",
          0x011A : "XResolution",
          0x011B : "YResolution",
          0x0128 : "ResolutionUnit",
          0x0111 : "StripOffsets",
          0x0116 : "RowsPerStrip",
          0x0117 : "StripByteCounts",
          0x0201 : "JPEGInterchangeFormat",
          0x0202 : "JPEGInterchangeFormatLength",
          0x012D : "TransferFunction",
          0x013E : "WhitePoint",
          0x013F : "PrimaryChromaticities",
          0x0211 : "YCbCrCoefficients",
          0x0214 : "ReferenceBlackWhite",
          0x0132 : "DateTime",
          0x010E : "ImageDescription",
          0x010F : "Make",
          0x0110 : "Model",
          0x0131 : "Software",
          0x013B : "Artist",
          0x8298 : "Copyright"
      };
  
      var GPSTags = EXIF.GPSTags = {
          0x0000 : "GPSVersionID",
          0x0001 : "GPSLatitudeRef",
          0x0002 : "GPSLatitude",
          0x0003 : "GPSLongitudeRef",
          0x0004 : "GPSLongitude",
          0x0005 : "GPSAltitudeRef",
          0x0006 : "GPSAltitude",
          0x0007 : "GPSTimeStamp",
          0x0008 : "GPSSatellites",
          0x0009 : "GPSStatus",
          0x000A : "GPSMeasureMode",
          0x000B : "GPSDOP",
          0x000C : "GPSSpeedRef",
          0x000D : "GPSSpeed",
          0x000E : "GPSTrackRef",
          0x000F : "GPSTrack",
          0x0010 : "GPSImgDirectionRef",
          0x0011 : "GPSImgDirection",
          0x0012 : "GPSMapDatum",
          0x0013 : "GPSDestLatitudeRef",
          0x0014 : "GPSDestLatitude",
          0x0015 : "GPSDestLongitudeRef",
          0x0016 : "GPSDestLongitude",
          0x0017 : "GPSDestBearingRef",
          0x0018 : "GPSDestBearing",
          0x0019 : "GPSDestDistanceRef",
          0x001A : "GPSDestDistance",
          0x001B : "GPSProcessingMethod",
          0x001C : "GPSAreaInformation",
          0x001D : "GPSDateStamp",
          0x001E : "GPSDifferential"
      };
  
       // EXIF 2.3 Spec
      var IFD1Tags = EXIF.IFD1Tags = {
          0x0100: "ImageWidth",
          0x0101: "ImageHeight",
          0x0102: "BitsPerSample",
          0x0103: "Compression",
          0x0106: "PhotometricInterpretation",
          0x0111: "StripOffsets",
          0x0112: "Orientation",
          0x0115: "SamplesPerPixel",
          0x0116: "RowsPerStrip",
          0x0117: "StripByteCounts",
          0x011A: "XResolution",
          0x011B: "YResolution",
          0x011C: "PlanarConfiguration",
          0x0128: "ResolutionUnit",
          0x0201: "JpegIFOffset",    // When image format is JPEG, this value show offset to JPEG data stored.(aka "ThumbnailOffset" or "JPEGInterchangeFormat")
          0x0202: "JpegIFByteCount", // When image format is JPEG, this value shows data size of JPEG image (aka "ThumbnailLength" or "JPEGInterchangeFormatLength")
          0x0211: "YCbCrCoefficients",
          0x0212: "YCbCrSubSampling",
          0x0213: "YCbCrPositioning",
          0x0214: "ReferenceBlackWhite"
      };
  
      var StringValues = EXIF.StringValues = {
          ExposureProgram : {
              0 : "Not defined",
              1 : "Manual",
              2 : "Normal program",
              3 : "Aperture priority",
              4 : "Shutter priority",
              5 : "Creative program",
              6 : "Action program",
              7 : "Portrait mode",
              8 : "Landscape mode"
          },
          MeteringMode : {
              0 : "Unknown",
              1 : "Average",
              2 : "CenterWeightedAverage",
              3 : "Spot",
              4 : "MultiSpot",
              5 : "Pattern",
              6 : "Partial",
              255 : "Other"
          },
          LightSource : {
              0 : "Unknown",
              1 : "Daylight",
              2 : "Fluorescent",
              3 : "Tungsten (incandescent light)",
              4 : "Flash",
              9 : "Fine weather",
              10 : "Cloudy weather",
              11 : "Shade",
              12 : "Daylight fluorescent (D 5700 - 7100K)",
              13 : "Day white fluorescent (N 4600 - 5400K)",
              14 : "Cool white fluorescent (W 3900 - 4500K)",
              15 : "White fluorescent (WW 3200 - 3700K)",
              17 : "Standard light A",
              18 : "Standard light B",
              19 : "Standard light C",
              20 : "D55",
              21 : "D65",
              22 : "D75",
              23 : "D50",
              24 : "ISO studio tungsten",
              255 : "Other"
          },
          Flash : {
              0x0000 : "Flash did not fire",
              0x0001 : "Flash fired",
              0x0005 : "Strobe return light not detected",
              0x0007 : "Strobe return light detected",
              0x0009 : "Flash fired, compulsory flash mode",
              0x000D : "Flash fired, compulsory flash mode, return light not detected",
              0x000F : "Flash fired, compulsory flash mode, return light detected",
              0x0010 : "Flash did not fire, compulsory flash mode",
              0x0018 : "Flash did not fire, auto mode",
              0x0019 : "Flash fired, auto mode",
              0x001D : "Flash fired, auto mode, return light not detected",
              0x001F : "Flash fired, auto mode, return light detected",
              0x0020 : "No flash function",
              0x0041 : "Flash fired, red-eye reduction mode",
              0x0045 : "Flash fired, red-eye reduction mode, return light not detected",
              0x0047 : "Flash fired, red-eye reduction mode, return light detected",
              0x0049 : "Flash fired, compulsory flash mode, red-eye reduction mode",
              0x004D : "Flash fired, compulsory flash mode, red-eye reduction mode, return light not detected",
              0x004F : "Flash fired, compulsory flash mode, red-eye reduction mode, return light detected",
              0x0059 : "Flash fired, auto mode, red-eye reduction mode",
              0x005D : "Flash fired, auto mode, return light not detected, red-eye reduction mode",
              0x005F : "Flash fired, auto mode, return light detected, red-eye reduction mode"
          },
          SensingMethod : {
              1 : "Not defined",
              2 : "One-chip color area sensor",
              3 : "Two-chip color area sensor",
              4 : "Three-chip color area sensor",
              5 : "Color sequential area sensor",
              7 : "Trilinear sensor",
              8 : "Color sequential linear sensor"
          },
          SceneCaptureType : {
              0 : "Standard",
              1 : "Landscape",
              2 : "Portrait",
              3 : "Night scene"
          },
          SceneType : {
              1 : "Directly photographed"
          },
          CustomRendered : {
              0 : "Normal process",
              1 : "Custom process"
          },
          WhiteBalance : {
              0 : "Auto white balance",
              1 : "Manual white balance"
          },
          GainControl : {
              0 : "None",
              1 : "Low gain up",
              2 : "High gain up",
              3 : "Low gain down",
              4 : "High gain down"
          },
          Contrast : {
              0 : "Normal",
              1 : "Soft",
              2 : "Hard"
          },
          Saturation : {
              0 : "Normal",
              1 : "Low saturation",
              2 : "High saturation"
          },
          Sharpness : {
              0 : "Normal",
              1 : "Soft",
              2 : "Hard"
          },
          SubjectDistanceRange : {
              0 : "Unknown",
              1 : "Macro",
              2 : "Close view",
              3 : "Distant view"
          },
          FileSource : {
              3 : "DSC"
          },
  
          Components : {
              0 : "",
              1 : "Y",
              2 : "Cb",
              3 : "Cr",
              4 : "R",
              5 : "G",
              6 : "B"
          }
      };
  
      function addEvent(element, event, handler) {
          if (element.addEventListener) {
              element.addEventListener(event, handler, false);
          } else if (element.attachEvent) {
              element.attachEvent("on" + event, handler);
          }
      }
  
      function imageHasData(img) {
          return !!(img.exifdata);
      }
  
  
      function base64ToArrayBuffer(base64, contentType) {
          contentType = contentType || base64.match(/^data\:([^\;]+)\;base64,/mi)[1] || ''; // e.g. 'data:image/jpeg;base64,...' => 'image/jpeg'
          base64 = base64.replace(/^data\:([^\;]+)\;base64,/gmi, '');
          var binary = atob(base64);
          var len = binary.length;
          var buffer = new ArrayBuffer(len);
          var view = new Uint8Array(buffer);
          for (var i = 0; i < len; i++) {
              view[i] = binary.charCodeAt(i);
          }
          return buffer;
      }
  
      function objectURLToBlob(url, callback) {
          var http = new XMLHttpRequest();
          http.open("GET", url, true);
          http.responseType = "blob";
          http.onload = function(e) {
              if (this.status == 200 || this.status === 0) {
                  callback(this.response);
              }
          };
          http.send();
      }
  
      function getImageData(img, callback) {
          function handleBinaryFile(binFile) {
              var data = findEXIFinJPEG(binFile);
              img.exifdata = data || {};
              var iptcdata = findIPTCinJPEG(binFile);
              img.iptcdata = iptcdata || {};
              if (EXIF.isXmpEnabled) {
                 var xmpdata= findXMPinJPEG(binFile);
                 img.xmpdata = xmpdata || {};               
              }
              if (callback) {
                  callback.call(img);
              }
          }
  
          if (img.src) {
              if (/^data\:/i.test(img.src)) { // Data URI
                  var arrayBuffer = base64ToArrayBuffer(img.src);
                  handleBinaryFile(arrayBuffer);
  
              } else if (/^blob\:/i.test(img.src)) { // Object URL
                  var fileReader = new FileReader();
                  fileReader.onload = function(e) {
                      handleBinaryFile(e.target.result);
                  };
                  objectURLToBlob(img.src, function (blob) {
                      fileReader.readAsArrayBuffer(blob);
                  });
              } else {
                  var isCorsStrict = ((img.crossOrigin || imageElement.crossorigin) === 'use-credentials');
  
                  var http = new XMLHttpRequest();
                  http.onload = function() {
                      if (this.status == 200 || this.status === 0) {
                          handleBinaryFile(http.response);
                      } else {
                          throw "Could not load image";
                      }
                      http = null;
                  };
                  if (isCorsStrict) { http.withCredentials = true; }
                  http.open("GET", img.src, true);
                  http.responseType = "arraybuffer";
                  http.send(null);
              }
          } else if (self.FileReader && (img instanceof self.Blob || img instanceof self.File)) {
              var fileReader = new FileReader();
              fileReader.onload = function(e) {
                  if (debug) console.log("Got file of length " + e.target.result.byteLength);
                  handleBinaryFile(e.target.result);
              };
  
              fileReader.readAsArrayBuffer(img);
          }
      }
  
      function findEXIFinJPEG(file) {
          var dataView = new DataView(file);
  
          if (debug) console.log("Got file of length " + file.byteLength);
          if ((dataView.getUint8(0) != 0xFF) || (dataView.getUint8(1) != 0xD8)) {
              if (debug) console.log("Not a valid JPEG");
              return false; // not a valid jpeg
          }
  
          var offset = 2,
              length = file.byteLength,
              marker;
  
          while (offset < length) {
              if (dataView.getUint8(offset) != 0xFF) {
                  if (debug) console.log("Not a valid marker at offset " + offset + ", found: " + dataView.getUint8(offset));
                  return false; // not a valid marker, something is wrong
              }
  
              marker = dataView.getUint8(offset + 1);
              if (debug) console.log(marker);
  
              // we could implement handling for other markers here,
              // but we're only looking for 0xFFE1 for EXIF data
  
              if (marker == 225) {
                  if (debug) console.log("Found 0xFFE1 marker");
  
                  return readEXIFData(dataView, offset + 4, dataView.getUint16(offset + 2) - 2);
  
                  // offset += 2 + file.getShortAt(offset+2, true);
  
              } else {
                  offset += 2 + dataView.getUint16(offset+2);
              }
  
          }
  
      }
  
      function findIPTCinJPEG(file) {
          var dataView = new DataView(file);
  
          if (debug) console.log("Got file of length " + file.byteLength);
          if ((dataView.getUint8(0) != 0xFF) || (dataView.getUint8(1) != 0xD8)) {
              if (debug) console.log("Not a valid JPEG");
              return false; // not a valid jpeg
          }
  
          var offset = 2,
              length = file.byteLength;
  
  
          var isFieldSegmentStart = function(dataView, offset){
              return (
                  dataView.getUint8(offset) === 0x38 &&
                  dataView.getUint8(offset+1) === 0x42 &&
                  dataView.getUint8(offset+2) === 0x49 &&
                  dataView.getUint8(offset+3) === 0x4D &&
                  dataView.getUint8(offset+4) === 0x04 &&
                  dataView.getUint8(offset+5) === 0x04
              );
          };
  
          while (offset < length) {
  
              if ( isFieldSegmentStart(dataView, offset )){
  
                  // Get the length of the name header (which is padded to an even number of bytes)
                  var nameHeaderLength = dataView.getUint8(offset+7);
                  if(nameHeaderLength % 2 !== 0) nameHeaderLength += 1;
                  // Check for pre photoshop 6 format
                  if(nameHeaderLength === 0) {
                      // Always 4
                      nameHeaderLength = 4;
                  }
  
                  var startOffset = offset + 8 + nameHeaderLength;
                  var sectionLength = dataView.getUint16(offset + 6 + nameHeaderLength);
  
                  return readIPTCData(file, startOffset, sectionLength);
  
                  break;
  
              }
  
  
              // Not the marker, continue searching
              offset++;
  
          }
  
      }
      var IptcFieldMap = {
          0x78 : 'caption',
          0x6E : 'credit',
          0x19 : 'keywords',
          0x37 : 'dateCreated',
          0x50 : 'byline',
          0x55 : 'bylineTitle',
          0x7A : 'captionWriter',
          0x69 : 'headline',
          0x74 : 'copyright',
          0x0F : 'category'
      };
      function readIPTCData(file, startOffset, sectionLength){
          var dataView = new DataView(file);
          var data = {};
          var fieldValue, fieldName, dataSize, segmentType, segmentSize;
          var segmentStartPos = startOffset;
          while(segmentStartPos < startOffset+sectionLength) {
              if(dataView.getUint8(segmentStartPos) === 0x1C && dataView.getUint8(segmentStartPos+1) === 0x02){
                  segmentType = dataView.getUint8(segmentStartPos+2);
                  if(segmentType in IptcFieldMap) {
                      dataSize = dataView.getInt16(segmentStartPos+3);
                      segmentSize = dataSize + 5;
                      fieldName = IptcFieldMap[segmentType];
                      fieldValue = getStringFromDB(dataView, segmentStartPos+5, dataSize);
                      // Check if we already stored a value with this name
                      if(data.hasOwnProperty(fieldName)) {
                          // Value already stored with this name, create multivalue field
                          if(data[fieldName] instanceof Array) {
                              data[fieldName].push(fieldValue);
                          }
                          else {
                              data[fieldName] = [data[fieldName], fieldValue];
                          }
                      }
                      else {
                          data[fieldName] = fieldValue;
                      }
                  }
  
              }
              segmentStartPos++;
          }
          return data;
      }
  
  
  
      function readTags(file, tiffStart, dirStart, strings, bigEnd) {
          var entries = file.getUint16(dirStart, !bigEnd),
              tags = {},
              entryOffset, tag,
              i;
  
          for (i=0;i<entries;i++) {
              entryOffset = dirStart + i*12 + 2;
              tag = strings[file.getUint16(entryOffset, !bigEnd)];
              if (!tag && debug) console.log("Unknown tag: " + file.getUint16(entryOffset, !bigEnd));
              tags[tag] = readTagValue(file, entryOffset, tiffStart, dirStart, bigEnd);
          }
          return tags;
      }
  
  
      function readTagValue(file, entryOffset, tiffStart, dirStart, bigEnd) {
          var type = file.getUint16(entryOffset+2, !bigEnd),
              numValues = file.getUint32(entryOffset+4, !bigEnd),
              valueOffset = file.getUint32(entryOffset+8, !bigEnd) + tiffStart,
              offset,
              vals, val, n,
              numerator, denominator;
  
          switch (type) {
              case 1: // byte, 8-bit unsigned int
              case 7: // undefined, 8-bit byte, value depending on field
                  if (numValues == 1) {
                      return file.getUint8(entryOffset + 8, !bigEnd);
                  } else {
                      offset = numValues > 4 ? valueOffset : (entryOffset + 8);
                      vals = [];
                      for (n=0;n<numValues;n++) {
                          vals[n] = file.getUint8(offset + n);
                      }
                      return vals;
                  }
  
              case 2: // ascii, 8-bit byte
                  offset = numValues > 4 ? valueOffset : (entryOffset + 8);
                  return getStringFromDB(file, offset, numValues-1);
  
              case 3: // short, 16 bit int
                  if (numValues == 1) {
                      return file.getUint16(entryOffset + 8, !bigEnd);
                  } else {
                      offset = numValues > 2 ? valueOffset : (entryOffset + 8);
                      vals = [];
                      for (n=0;n<numValues;n++) {
                          vals[n] = file.getUint16(offset + 2*n, !bigEnd);
                      }
                      return vals;
                  }
  
              case 4: // long, 32 bit int
                  if (numValues == 1) {
                      return file.getUint32(entryOffset + 8, !bigEnd);
                  } else {
                      vals = [];
                      for (n=0;n<numValues;n++) {
                          vals[n] = file.getUint32(valueOffset + 4*n, !bigEnd);
                      }
                      return vals;
                  }
  
              case 5:    // rational = two long values, first is numerator, second is denominator
                  if (numValues == 1) {
                      numerator = file.getUint32(valueOffset, !bigEnd);
                      denominator = file.getUint32(valueOffset+4, !bigEnd);
                      val = new Number(numerator / denominator);
                      val.numerator = numerator;
                      val.denominator = denominator;
                      return val;
                  } else {
                      vals = [];
                      for (n=0;n<numValues;n++) {
                          numerator = file.getUint32(valueOffset + 8*n, !bigEnd);
                          denominator = file.getUint32(valueOffset+4 + 8*n, !bigEnd);
                          vals[n] = new Number(numerator / denominator);
                          vals[n].numerator = numerator;
                          vals[n].denominator = denominator;
                      }
                      return vals;
                  }
  
              case 9: // slong, 32 bit signed int
                  if (numValues == 1) {
                      return file.getInt32(entryOffset + 8, !bigEnd);
                  } else {
                      vals = [];
                      for (n=0;n<numValues;n++) {
                          vals[n] = file.getInt32(valueOffset + 4*n, !bigEnd);
                      }
                      return vals;
                  }
  
              case 10: // signed rational, two slongs, first is numerator, second is denominator
                  if (numValues == 1) {
                      return file.getInt32(valueOffset, !bigEnd) / file.getInt32(valueOffset+4, !bigEnd);
                  } else {
                      vals = [];
                      for (n=0;n<numValues;n++) {
                          vals[n] = file.getInt32(valueOffset + 8*n, !bigEnd) / file.getInt32(valueOffset+4 + 8*n, !bigEnd);
                      }
                      return vals;
                  }
          }
      }
  
      /**
      * Given an IFD (Image File Directory) start offset
      * returns an offset to next IFD or 0 if it's the last IFD.
      */
      function getNextIFDOffset(dataView, dirStart, bigEnd){
          //the first 2bytes means the number of directory entries contains in this IFD
          var entries = dataView.getUint16(dirStart, !bigEnd);
  
          // After last directory entry, there is a 4bytes of data,
          // it means an offset to next IFD.
          // If its value is '0x00000000', it means this is the last IFD and there is no linked IFD.
  
          return dataView.getUint32(dirStart + 2 + entries * 12, !bigEnd); // each entry is 12 bytes long
      }
  
      function readThumbnailImage(dataView, tiffStart, firstIFDOffset, bigEnd){
          // get the IFD1 offset
          var IFD1OffsetPointer = getNextIFDOffset(dataView, tiffStart+firstIFDOffset, bigEnd);
  
          if (!IFD1OffsetPointer) {
              // console.log('******** IFD1Offset is empty, image thumb not found ********');
              return {};
          }
          else if (IFD1OffsetPointer > dataView.byteLength) { // this should not happen
              // console.log('******** IFD1Offset is outside the bounds of the DataView ********');
              return {};
          }
          // console.log('*******  thumbnail IFD offset (IFD1) is: %s', IFD1OffsetPointer);
  
          var thumbTags = readTags(dataView, tiffStart, tiffStart + IFD1OffsetPointer, IFD1Tags, bigEnd)
  
          // EXIF 2.3 specification for JPEG format thumbnail
  
          // If the value of Compression(0x0103) Tag in IFD1 is '6', thumbnail image format is JPEG.
          // Most of Exif image uses JPEG format for thumbnail. In that case, you can get offset of thumbnail
          // by JpegIFOffset(0x0201) Tag in IFD1, size of thumbnail by JpegIFByteCount(0x0202) Tag.
          // Data format is ordinary JPEG format, starts from 0xFFD8 and ends by 0xFFD9. It seems that
          // JPEG format and 160x120pixels of size are recommended thumbnail format for Exif2.1 or later.
  
          if (thumbTags['Compression']) {
              // console.log('Thumbnail image found!');
  
              switch (thumbTags['Compression']) {
                  case 6:
                      // console.log('Thumbnail image format is JPEG');
                      if (thumbTags.JpegIFOffset && thumbTags.JpegIFByteCount) {
                      // extract the thumbnail
                          var tOffset = tiffStart + thumbTags.JpegIFOffset;
                          var tLength = thumbTags.JpegIFByteCount;
                          thumbTags['blob'] = new Blob([new Uint8Array(dataView.buffer, tOffset, tLength)], {
                              type: 'image/jpeg'
                          });
                      }
                  break;
  
              case 1:
                  console.log("Thumbnail image format is TIFF, which is not implemented.");
                  break;
              default:
                  console.log("Unknown thumbnail image format '%s'", thumbTags['Compression']);
              }
          }
          else if (thumbTags['PhotometricInterpretation'] == 2) {
              console.log("Thumbnail image format is RGB, which is not implemented.");
          }
          return thumbTags;
      }
  
      function getStringFromDB(buffer, start, length) {
          var outstr = "";
          for (var n = start; n < start+length; n++) {
              outstr += String.fromCharCode(buffer.getUint8(n));
          }
          return outstr;
      }
  
      function readEXIFData(file, start) {
          if (getStringFromDB(file, start, 4) != "Exif") {
              if (debug) console.log("Not valid EXIF data! " + getStringFromDB(file, start, 4));
              return false;
          }
  
          var bigEnd,
              tags, tag,
              exifData, gpsData,
              tiffOffset = start + 6;
  
          // test for TIFF validity and endianness
          if (file.getUint16(tiffOffset) == 0x4949) {
              bigEnd = false;
          } else if (file.getUint16(tiffOffset) == 0x4D4D) {
              bigEnd = true;
          } else {
              if (debug) console.log("Not valid TIFF data! (no 0x4949 or 0x4D4D)");
              return false;
          }
  
          if (file.getUint16(tiffOffset+2, !bigEnd) != 0x002A) {
              if (debug) console.log("Not valid TIFF data! (no 0x002A)");
              return false;
          }
  
          var firstIFDOffset = file.getUint32(tiffOffset+4, !bigEnd);
  
          if (firstIFDOffset < 0x00000008) {
              if (debug) console.log("Not valid TIFF data! (First offset less than 8)", file.getUint32(tiffOffset+4, !bigEnd));
              return false;
          }
  
          tags = readTags(file, tiffOffset, tiffOffset + firstIFDOffset, TiffTags, bigEnd);
  
          if (tags.ExifIFDPointer) {
              exifData = readTags(file, tiffOffset, tiffOffset + tags.ExifIFDPointer, ExifTags, bigEnd);
              for (tag in exifData) {
                  switch (tag) {
                      case "LightSource" :
                      case "Flash" :
                      case "MeteringMode" :
                      case "ExposureProgram" :
                      case "SensingMethod" :
                      case "SceneCaptureType" :
                      case "SceneType" :
                      case "CustomRendered" :
                      case "WhiteBalance" :
                      case "GainControl" :
                      case "Contrast" :
                      case "Saturation" :
                      case "Sharpness" :
                      case "SubjectDistanceRange" :
                      case "FileSource" :
                          exifData[tag] = StringValues[tag][exifData[tag]];
                          break;
  
                      case "ExifVersion" :
                      case "FlashpixVersion" :
                          exifData[tag] = String.fromCharCode(exifData[tag][0], exifData[tag][1], exifData[tag][2], exifData[tag][3]);
                          break;
  
                      case "ComponentsConfiguration" :
                          exifData[tag] =
                              StringValues.Components[exifData[tag][0]] +
                              StringValues.Components[exifData[tag][1]] +
                              StringValues.Components[exifData[tag][2]] +
                              StringValues.Components[exifData[tag][3]];
                          break;
                  }
                  tags[tag] = exifData[tag];
              }
          }
  
          if (tags.GPSInfoIFDPointer) {
              gpsData = readTags(file, tiffOffset, tiffOffset + tags.GPSInfoIFDPointer, GPSTags, bigEnd);
              for (tag in gpsData) {
                  switch (tag) {
                      case "GPSVersionID" :
                          gpsData[tag] = gpsData[tag][0] +
                              "." + gpsData[tag][1] +
                              "." + gpsData[tag][2] +
                              "." + gpsData[tag][3];
                          break;
                  }
                  tags[tag] = gpsData[tag];
              }
          }
  
          // extract thumbnail
          tags['thumbnail'] = readThumbnailImage(file, tiffOffset, firstIFDOffset, bigEnd);
  
          return tags;
      }
  
     function findXMPinJPEG(file) {
  
          if (!('DOMParser' in self)) {
              // console.warn('XML parsing not supported without DOMParser');
              return;
          }
          var dataView = new DataView(file);
  
          if (debug) console.log("Got file of length " + file.byteLength);
          if ((dataView.getUint8(0) != 0xFF) || (dataView.getUint8(1) != 0xD8)) {
             if (debug) console.log("Not a valid JPEG");
             return false; // not a valid jpeg
          }
  
          var offset = 2,
              length = file.byteLength,
              dom = new DOMParser();
  
          while (offset < (length-4)) {
              if (getStringFromDB(dataView, offset, 4) == "http") {
                  var startOffset = offset - 1;
                  var sectionLength = dataView.getUint16(offset - 2) - 1;
                  var xmpString = getStringFromDB(dataView, startOffset, sectionLength)
                  var xmpEndIndex = xmpString.indexOf('xmpmeta>') + 8;
                  xmpString = xmpString.substring( xmpString.indexOf( '<x:xmpmeta' ), xmpEndIndex );
  
                  var indexOfXmp = xmpString.indexOf('x:xmpmeta') + 10
                  //Many custom written programs embed xmp/xml without any namespace. Following are some of them.
                  //Without these namespaces, XML is thought to be invalid by parsers
                  xmpString = xmpString.slice(0, indexOfXmp)
                              + 'xmlns:Iptc4xmpCore="http://iptc.org/std/Iptc4xmpCore/1.0/xmlns/" '
                              + 'xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" '
                              + 'xmlns:tiff="http://ns.adobe.com/tiff/1.0/" '
                              + 'xmlns:plus="http://schemas.android.com/apk/lib/com.google.android.gms.plus" '
                              + 'xmlns:ext="http://www.gettyimages.com/xsltExtension/1.0" '
                              + 'xmlns:exif="http://ns.adobe.com/exif/1.0/" '
                              + 'xmlns:stEvt="http://ns.adobe.com/xap/1.0/sType/ResourceEvent#" '
                              + 'xmlns:stRef="http://ns.adobe.com/xap/1.0/sType/ResourceRef#" '
                              + 'xmlns:crs="http://ns.adobe.com/camera-raw-settings/1.0/" '
                              + 'xmlns:xapGImg="http://ns.adobe.com/xap/1.0/g/img/" '
                              + 'xmlns:Iptc4xmpExt="http://iptc.org/std/Iptc4xmpExt/2008-02-29/" '
                              + xmpString.slice(indexOfXmp)
  
                  var domDocument = dom.parseFromString( xmpString, 'text/xml' );
                  return xml2Object(domDocument);
              } else{
               offset++;
              }
          }
      }
  
      function xml2json(xml) {
          var json = {};
        
          if (xml.nodeType == 1) { // element node
            if (xml.attributes.length > 0) {
              json['@attributes'] = {};
              for (var j = 0; j < xml.attributes.length; j++) {
                var attribute = xml.attributes.item(j);
                json['@attributes'][attribute.nodeName] = attribute.nodeValue;
              }
            }
          } else if (xml.nodeType == 3) { // text node
            return xml.nodeValue;
          }
        
          // deal with children
          if (xml.hasChildNodes()) {
            for(var i = 0; i < xml.childNodes.length; i++) {
              var child = xml.childNodes.item(i);
              var nodeName = child.nodeName;
              if (json[nodeName] == null) {
                json[nodeName] = xml2json(child);
              } else {
                if (json[nodeName].push == null) {
                  var old = json[nodeName];
                  json[nodeName] = [];
                  json[nodeName].push(old);
                }
                json[nodeName].push(xml2json(child));
              }
            }
          }
          
          return json;
      }
  
      function xml2Object(xml) {
          try {
              var obj = {};
              if (xml.children.length > 0) {
                for (var i = 0; i < xml.children.length; i++) {
                  var item = xml.children.item(i);
                  var attributes = item.attributes;
                  for(var idx in attributes) {
                      var itemAtt = attributes[idx];
                      var dataKey = itemAtt.nodeName;
                      var dataValue = itemAtt.nodeValue;
  
                      if(dataKey !== undefined) {
                          obj[dataKey] = dataValue;
                      }
                  }
                  var nodeName = item.nodeName;
  
                  if (typeof (obj[nodeName]) == "undefined") {
                    obj[nodeName] = xml2json(item);
                  } else {
                    if (typeof (obj[nodeName].push) == "undefined") {
                      var old = obj[nodeName];
  
                      obj[nodeName] = [];
                      obj[nodeName].push(old);
                    }
                    obj[nodeName].push(xml2json(item));
                  }
                }
              } else {
                obj = xml.textContent;
              }
              return obj;
            } catch (e) {
                console.log(e.message);
            }
      }
  
      EXIF.enableXmp = function() {
          EXIF.isXmpEnabled = true;
      }
  
      EXIF.disableXmp = function() {
          EXIF.isXmpEnabled = false;
      }
  
      EXIF.getData = function(img, callback) {
          if (((self.Image && img instanceof self.Image)
              || (self.HTMLImageElement && img instanceof self.HTMLImageElement))
              && !img.complete)
              return false;
  
          if (!imageHasData(img)) {
              getImageData(img, callback);
          } else {
              if (callback) {
                  callback.call(img);
              }
          }
          return true;
      }
  
      EXIF.getTag = function(img, tag) {
          if (!imageHasData(img)) return;
          return img.exifdata[tag];
      }
      
      EXIF.getIptcTag = function(img, tag) {
          if (!imageHasData(img)) return;
          return img.iptcdata[tag];
      }
  
      EXIF.getAllTags = function(img) {
          if (!imageHasData(img)) return {};
          var a,
              data = img.exifdata,
              tags = {};
          for (a in data) {
              if (data.hasOwnProperty(a)) {
                  tags[a] = data[a];
              }
          }
          return tags;
      }
      
      EXIF.getAllIptcTags = function(img) {
          if (!imageHasData(img)) return {};
          var a,
              data = img.iptcdata,
              tags = {};
          for (a in data) {
              if (data.hasOwnProperty(a)) {
                  tags[a] = data[a];
              }
          }
          return tags;
      }
  
      EXIF.pretty = function(img) {
          if (!imageHasData(img)) return "";
          var a,
              data = img.exifdata,
              strPretty = "";
          for (a in data) {
              if (data.hasOwnProperty(a)) {
                  if (typeof data[a] == "object") {
                      if (data[a] instanceof Number) {
                          strPretty += a + " : " + data[a] + " [" + data[a].numerator + "/" + data[a].denominator + "]\r\n";
                      } else {
                          strPretty += a + " : [" + data[a].length + " values]\r\n";
                      }
                  } else {
                      strPretty += a + " : " + data[a] + "\r\n";
                  }
              }
          }
          return strPretty;
      }
  
      EXIF.readFromBinaryFile = function(file) {
          return findEXIFinJPEG(file);
      }
  
      if (typeof define === 'function' && define.amd) {
          define('exif-js', [], function() {
              return EXIF;
          });
      }
  }.call(this));
  
  