public double CompassDirection()
{
if (GPSIFD == null)
{
return(0.0D);
}
InteroperabilityField field = GPSIFD.GetTag(Exif_GPS_Image_Direction);
if (field == null || field.Type != 5)
{
return(0.0D);
}
if (field.Count == 3)
{
double degrees = 0.0D;
double minutes = 0.0D;
double seconds = 0.0D;
GPSTime(GPSIFD, Exif_GPS_Image_Direction, out degrees, out minutes, out seconds);
double return_value = ConvertDegreesMinutesSecondsCoordinateToDecimalDegrees(degrees, minutes, seconds);
if (return_value >= 360.0D)
{
return_value = 0.0D;
}
return(return_value);
}
return(DecimalValue(GPSIFD, Exif_GPS_Image_Direction));
}
public string SerialNumber()
{
string return_value = StringValue(Exif_Photo_BodySerialNumber);
if (string.IsNullOrEmpty(return_value) == false)
{
return(return_value);
}
// See if we can pull the data from a makernote.
string make = Make().ToLowerInvariant();
if (make.Contains("nikon") == true && ExifIFD != null)
{
// Find the maker note...
InteroperabilityField maker_note_field = ExifIFD.GetTag(MakerNote);
if (maker_note_field != null)
{
byte[] maker_note_buffer = new byte[maker_note_field.Count - 10];
Array.Copy(TIFFData, maker_note_field.OffsetToValue + 10, maker_note_buffer, 0, maker_note_field.Count - 10);
TIFFHeader th = new TIFFHeader();
if (th.FromBytes(maker_note_buffer, 0) == true)
{
ImageFileDirectory maker_note = new ImageFileDirectory();
if (maker_note.FromBytes(maker_note_buffer, th.OffsetToZerothIFD, th.LittleEndian) == true)
{
// Now read from the Maker Note Buffer!
return_value = StringValue(maker_note, Exif_MakerNote_Nikon3_SerialNumber, maker_note_buffer);
if (string.IsNullOrEmpty(return_value) == true)
{
return_value = StringValue(maker_note, Exif_MakerNote_Nikon3_SerialNO, maker_note_buffer);
if (return_value.StartsWith("NO=") == true)
{
return(return_value.Substring(3, return_value.Length - 3).Trim());
}
}
}
}
return(return_value);
}
}
return(string.Empty);
}
/// <summary>
/// Parses the bytes specified as an InteroperabilityField.
/// </summary>
/// <param name="buffer">The buffer containing the data.</param>
/// <param name="offset">The offset into the buffer to begin parsing.</param>
/// <param name="little_endian">When true, integers are in little endian format, when false integers are in big endian format.</param>
/// <returns>An InteroperabilityField object.</returns>
public static InteroperabilityField FromBytes(byte[] buffer, int offset, bool little_endian)
{
var return_value = new InteroperabilityField();
return_value.IsLittleEndian = little_endian;
return_value.Tag = TIFFHeader.ToUInt16(buffer, offset, little_endian);
return_value.Type = TIFFHeader.ToUInt16(buffer, offset + 2, little_endian);
return_value.Count = TIFFHeader.ToInt32(buffer, offset + 4, little_endian);
return_value.OffsetToValue = TIFFHeader.ToInt32(buffer, offset + 8, little_endian);
return_value.Byte0 = buffer[offset + 8];
return_value.Byte1 = buffer[offset + 9];
return_value.Byte2 = buffer[offset + 10];
return_value.Byte3 = buffer[offset + 11];
return_value.Buffer = buffer;
return(return_value);
}
public bool FromBytes(byte[] buffer, int offset, bool little_endian)
{
Empty();
if (buffer == null || offset < 0 || buffer.Length < 6)
{
return(false);
}
int number_of_entries = TIFFHeader.ToUInt16(buffer, offset, little_endian);
if (number_of_entries > 5460) // 5461 entries in 64KB buffer
{
return(false);
}
Fields = new InteroperabilityField[number_of_entries];
string tag_name = string.Empty;
int entry_index = 0;
while (entry_index < number_of_entries)
{
Fields[entry_index] = InteroperabilityField.FromBytes(buffer, offset + 2 + (entry_index * 12), little_endian);
if (TagNames != null && TagNames.TryGetValue(Fields[entry_index].Tag, out tag_name) == true)
{
Fields[entry_index].TagName = tag_name;
}
entry_index++;
}
NextOffset = TIFFHeader.ToInt32(buffer, offset + 2 + (number_of_entries * 12), little_endian);
return(true);
}
public double DegreesValue(ImageFileDirectory ifd, int tag)
{
if (TIFFData == null || ifd == null)
{
return(0.0D);
}
InteroperabilityField field = ifd.GetTag(tag);
if (field == null || (field.Type != 5 && field.Type != 10))
{
return(0.0D);
}
if (field.Count < 3)
{
return(0.0D);
}
int[] integer_array = new int[field.Count * 2]; // Rationals are two integers each
int array_index = 0;
while (array_index < integer_array.Length)
{
integer_array[array_index] = TIFFHeader.ToInt32(TIFFData, field.OffsetToValue + (array_index * 4), Header.LittleEndian);
array_index++;
}
double degrees = Rational(integer_array[0], integer_array[1]);
double minutes = Rational(integer_array[2], integer_array[3]);
double seconds = Rational(integer_array[4], integer_array[5]);
double return_value = ConvertDegreesMinutesSecondsCoordinateToDecimalDegrees(degrees, minutes, seconds);
return(return_value);
}