Ios exif is null but work on android with same jpg file

[alainib]

Hello.
I use this lib to read exif from jpg, thanks for the nice work.
It work very well on android but not on IOS (tested with iphone 5)

I use the same JPG file with exif inside with same code on android and Ios

the JS code to Test if exif where readed good is :

  const prefixe = "data:image/jpeg;base64,";
  const srcdata = await RNFS.readFile(image.path, "base64");
  var exifObj = piexif.load(prefixe + srcdata); 
  for (var ifd in exifObj) {
     if (ifd == "thumbnail") {
     continue;
     }
     console.log("-" + ifd);
     for (var tag in exifObj[ifd]) {
     console.log("  " + piexif.TAGS[ifd][tag]["name"] + ":" + exifObj[ifd][tag]);
     }
  }

1. IOS results :

If i log exif from piexifjs this is what i get :

  -0th
     Orientation:1
     ExifTag:38
  -Exif
     ColorSpace:1
     PixelXDimension:2448
     PixelYDimension:3264
  -GPS
  -Interop
  -1st 

If i use react-native-image-crop-picker i get good exif on Android and Ios but i need piexifs because i want to read exif, compress jpg then re write exif

log from react-native-image-crop-picker on Ios

   {Exif}:
	  ApertureValue:2.52606882168926
	  BrightnessValue:3.343102774521297
	  ColorSpace:1
	  ComponentsConfiguration:(4) [1, 2, 3, 0]
	  DateTimeDigitized:"2018:09:28 10:34:06"
	  DateTimeOriginal:"2018:09:28 10:34:06"
	  ExifVersion:(3) [2, 2, 1]
	  ExposureBiasValue:0
	  ExposureMode:0
	  ExposureProgram:2
	  ExposureTime:0.05
	  FNumber:2.4
	  Flash:24
	  FlashPixVersion:(2) [1, 0]
	  FocalLenIn35mmFilm:33
	  FocalLength:4.12
	  ISOSpeedRatings:[64]
	  LensMake:"Apple"
	  LensModel:"iPhone 5c back camera 4.12mm f/2.4"
	  ... 

2. Android results with same jpg file with piexif

   -0th
   Make:Apple
   Model:iPhone 5c
   Orientation:1
   XResolution:72,1
   YResolution:72,1
   ResolutionUnit:2
   Software:Photos 3.0
   DateTime:2018:09:28 10:34:06
   ExifTag:198
   GPSTag:1010
   -Exif
   ExposureTime:1,20
   FNumber:12,5
   ExposureProgram:2
   ISOSpeedRatings:64
   ExifVersion:0221
   DateTimeOriginal:2018:09:28 10:34:06
   DateTimeDigitized:2018:09:28 10:34:06
   FlashpixVersion:0100
   ColorSpace:1
   PixelXDimension:2448
   PixelYDimension:3264
   SensingMethod:2
   ExposureMode:0
   WhiteBalance:0
   FocalLengthIn35mmFilm:33
   SceneCaptureType:0
   LensSpecification:103,25,103,25,12,5,12,5
   LensMake:Apple
   LensModel:iPhone 5c back camera 4.12mm f/2.4
   -GPS
   GPSLatitudeRef:N
   GPSLatitude:43,1,39,1,619,100
   GPSLongitudeRef:E
   GPSLongitude:3,1,51,1,4265,100
   GPSAltitudeRef:0
   GPSAltitude:45,1
   GPSTimeStamp:8,1,34,1,4,1
   GPSSpeedRef:K
   GPSSpeed:183,100
   GPSImgDirectionRef:T
   GPSImgDirection:21788,115
   GPSDestBearingRef:T
   GPSDestBearing:21788,115
   GPSDateStamp:2018:09:28
   GPSHPositioningError:100,1
   -Interop
   -1st

Did you think there is a fix ?

EDIT : this is my "transplante" function

  // RNFS is react-native-fs
  const srcdata = await RNFS.readFile(image.path, "base64");
  
  var srcexifs = piexif.load(prefixe + srcdata);

  //compress image
  const compressedImage = await ImageResizer.createResizedImage(image.path, 900, 900, "JPEG", 72);

  const compressedImageb64 = await RNFS.readFile(compressedImage.uri, "base64");
  // get exif to write them 
  const _zero = srcexifs["0th"];
  const _first = srcexifs["1st"];
  const _Exif = srcexifs["Exif"];
  const _GPS = srcexifs["GPS"];

  var exifObj = { "0th": _zero, "1st": _first, Exif: _Exif, GPS: _GPS };
  var exifbytes = piexif.dump(exifObj);
  //  write the exif in base64 image
  var bs64Exif = piexif.insert(exifbytes, prefixe + compressedImageb64).substring(prefixe.length);
  // write the file
  await RNFS.writeFile(compressedImage.uri, bs64Exif, "base64");

[HarelM]

I have a similar issue, i think, with version 2.0.
when using from web browser it works as expected, but when using this library from cordova as which i think is similar to react native, it fails when using load.
I think reverting to 1.4 is my best bet...?