public void SetReader(BinaryReader jpegFileReader)
{
TiffHeaderOffset = 12;
_jpegFileReader = jpegFileReader;
_binaryReader = new BigEndianBinaryReader(_jpegFileReader);
}
public ExifPhoto GetPhotoInfo()
{
var fileHeader = _jpegFileReader.ReadBytes(2);
if (!IsJpeg(fileHeader))
{
throw new InvalidDataException("File is not a recognisable jpeg file");
}
var nextHeader = _jpegFileReader.ReadBytes(2);
if (!IsExif(nextHeader))
{
if (!IsJfif(nextHeader))
{
throw new InvalidDataException("File does not start with JPEG Exif header");
}
var jfifLength = _binaryReader.ReadUInt16();
_jpegFileReader.BaseStream.Seek(jfifLength - 2, SeekOrigin.Current);
nextHeader = _jpegFileReader.ReadBytes(2);
if (!IsExif(nextHeader))
{
throw new InvalidDataException("Could not find Exif header");
}
TiffHeaderOffset = _jpegFileReader.BaseStream.Position + 8;
}
if (!IsBigEndian())
{
_binaryReader = new LittleEndianBinaryReader(_jpegFileReader);
}
var photo = new ExifPhoto();
ReadIFDHeader(ExifHeader.IFD0, 8, photo);
if (photo.SubIFDPosition == 0)
{
throw new InvalidDataException("Have not found ExifSubIdTag inside the file");
}
ReadIFDHeader(ExifHeader.SubIFD, photo.SubIFDPosition, photo);
if (photo.Manufacturer == null || photo.Model == null)
{
throw new InvalidDataException("Could not read photo manufacturer or model from the Exif header");
}
return(photo);
}
public void SetReader(BinaryReader jpegFileReader)
{
TiffHeaderOffset = 12;
_jpegFileReader = jpegFileReader;
_binaryReader = new BigEndianBinaryReader(_jpegFileReader);
}
public ExifPhoto GetPhotoInfo()
{
var fileHeader = _jpegFileReader.ReadBytes(2);
if (!IsJpeg(fileHeader)) throw new InvalidDataException("File is not a recognisable jpeg file");
var nextHeader = _jpegFileReader.ReadBytes(2);
if (!IsExif(nextHeader)) {
if (!IsJfif(nextHeader))
throw new InvalidDataException("File does not start with JPEG Exif header");
var jfifLength = _binaryReader.ReadUInt16();
_jpegFileReader.BaseStream.Seek(jfifLength - 2, SeekOrigin.Current);
nextHeader = _jpegFileReader.ReadBytes(2);
if (!IsExif(nextHeader)) throw new InvalidDataException("Could not find Exif header");
TiffHeaderOffset = _jpegFileReader.BaseStream.Position + 8;
}
if (!IsBigEndian()) _binaryReader = new LittleEndianBinaryReader(_jpegFileReader);
var photo = new ExifPhoto();
ReadIFDHeader(ExifHeader.IFD0, 8, photo);
if (photo.SubIFDPosition == 0)
throw new InvalidDataException("Have not found ExifSubIdTag inside the file");
ReadIFDHeader(ExifHeader.SubIFD, photo.SubIFDPosition, photo);
if (photo.Manufacturer == null || photo.Model == null)
throw new InvalidDataException("Could not read photo manufacturer or model from the Exif header");
return photo;
}
