public int IntegerValue(ImageFileDirectory ifd, int tag)
{
if (TIFFData == null || ifd == null)
{
return(0);
}
var field = ifd.GetTag(tag);
if (field == null || field.Count < 1)
{
return(0);
}
if (field.Type == 3)
{
return(field.AsShort());
}
if (field.Type == 4)
{
return(LongValue(ifd, tag));
}
return(0);
}
/// <summary>
/// Returns the number of times the shutter has opened on the camera.
/// </summary>
/// <returns>The number of times the camera's shutter has opened.</returns>
public int ShutterCount()
{
// 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...
var 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);
var tiff_header = new TIFFHeader();
if (tiff_header.FromBytes(maker_note_buffer, 0) == true)
{
var maker_note = new ImageFileDirectory();
if (maker_note.FromBytes(maker_note_buffer, tiff_header.OffsetToZerothIFD, tiff_header.LittleEndian) == true)
{
return(IntegerValue(maker_note, Exif_MakerNote_Nikon3_ShutterCount));
}
}
}
}
return(0);
}
/// <summary>
/// The default constructor.
/// </summary>
public Exif()
{
Header = new TIFFHeader();
IFD0 = new ImageFileDirectory();
IFD0.InitializeIFD0TagNames();
ExifIFD = null;
GPSIFD = null;
TIFFData = null;
}
public string StringValue(ImageFileDirectory ifd, int tag)
{
if (TIFFData == null || ifd == null)
{
return(string.Empty);
}
return(StringValue(ifd, tag, TIFFData));
}
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);
}
public DateTime Date(ImageFileDirectory ifd, int tag)
{
string date_string = StringValue(ifd, tag);
if (string.IsNullOrEmpty(date_string) == true)
{
return(DateTime.MinValue);
}
if (date_string.Length != 10)
{
return(DateTime.MinValue);
}
if (date_string[4] != ':' || date_string[7] != ':')
{
return(DateTime.MinValue);
}
int year = 0;
int month = 0;
int day = 0;
string string_to_parse = date_string.Substring(0, 4);
if (Int32.TryParse(string_to_parse, out year) == false)
{
return(DateTime.MinValue);
}
string_to_parse = date_string.Substring(5, 2);
if (Int32.TryParse(string_to_parse, out month) == false)
{
return(DateTime.MinValue);
}
string_to_parse = date_string.Substring(8, 2);
if (Int32.TryParse(string_to_parse, out day) == false)
{
return(DateTime.MinValue);
}
return(new DateTime(year, month, day));
}
public double DecimalValue(ImageFileDirectory ifd, int tag, byte[] buffer)
{
if (buffer == null || ifd == null)
{
return(0.0D);
}
var field = ifd.GetTag(tag);
if (field == null || field.Type != 5)
{
return(0.0D);
}
int numerator = TIFFHeader.ToInt32(buffer, field.OffsetToValue, Header.LittleEndian);
int denominator = TIFFHeader.ToInt32(buffer, field.OffsetToValue + 4, Header.LittleEndian);
double return_value = Rational(numerator, denominator);
return(return_value);
}
public bool GPSTime(ImageFileDirectory ifd, int tag, out double hours, out double minutes, out double seconds)
{
hours = 0.0D;
minutes = 0.0D;
seconds = 0.0D;
if (TIFFData == null || ifd == null)
{
return(false);
}
var field = ifd.GetTag(tag);
if (field == null || field.Type != 5)
{
return(false);
}
if (field.Count < 3)
{
return(false);
}
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++;
}
hours = Rational(integer_array[0], integer_array[1]);
minutes = Rational(integer_array[2], integer_array[3]);
seconds = Rational(integer_array[4], integer_array[5]);
return(true);
}
public int LongValue(ImageFileDirectory ifd, int tag)
{
if (TIFFData == null || ifd == null)
{
return(0);
}
var field = ifd.GetTag(tag);
if (field == null || field.Type != 4 || field.Count < 1)
{
return(0);
}
// Lookout for values less than 4...
if (field.Count <= 1)
{
return(field.OffsetToValue);
}
return(0);
}
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);
}
/// <summary>
/// This parses the given bytes as EXIF information.
/// </summary>
/// <param name="bytes">The bytes to parse.</param>
/// <returns>True on success, false otherwise.</returns>
public bool FromBytes(byte[] bytes)
{
if (bytes == null || bytes.Length < 16)
{
return(false);
}
// Find the Exif signature...
int array_index = 0;
int exif_signature_offset = -1;
int tiff_offset = -1;
while (array_index < (bytes.Length - 6))
{
if (bytes[array_index] == 'E' &&
bytes[array_index + 1] == 'x' &&
bytes[array_index + 2] == 'i' &&
bytes[array_index + 3] == 'f' &&
bytes[array_index + 4] == 0 &&
bytes[array_index + 5] == 0)
{
exif_signature_offset = array_index;
array_index = bytes.Length; // Exit the loop
}
array_index++;
}
if (exif_signature_offset < 0)
{
// Let's try to find the TIFF Header
array_index = 0;
while (array_index < (bytes.Length - 4))
{
if (((bytes[array_index] == 'M' && bytes[array_index + 1] == 'M') ||
(bytes[array_index] == 'I' && bytes[array_index + 1] == 'I')) &&
bytes[array_index + 2] == 0x00 &&
bytes[array_index + 3] == 0x2A)
{
exif_signature_offset = array_index;
array_index = bytes.Length; // Exit the loop
}
array_index++;
}
if (exif_signature_offset < 0)
{
// Can't find the TIFF signature either
return(false);
}
tiff_offset = exif_signature_offset;
}
else
{
tiff_offset = exif_signature_offset + 6;
}
if (Header.FromBytes(bytes, tiff_offset) == false)
{
return(false);
}
int tiff_data_length = bytes.Length - tiff_offset;
if (tiff_data_length > Program.OneMegabyte)
{
tiff_data_length = Program.OneMegabyte;
}
TIFFData = new byte[tiff_data_length];
Array.Copy(bytes, tiff_offset, TIFFData, 0, tiff_data_length);
IFD0.FromBytes(TIFFData, Header.OffsetToZerothIFD, Header.LittleEndian);
var exif_field = IFD0.GetTag(ExifIFDPointer);
if (exif_field != null)
{
ExifIFD = new ImageFileDirectory();
ExifIFD.InitializeExifTagNames();
ExifIFD.FromBytes(TIFFData, exif_field.OffsetToValue, Header.LittleEndian);
}
var gps_field = IFD0.GetTag(GpsIFDPointer);
if (gps_field != null)
{
GPSIFD = new ImageFileDirectory();
GPSIFD.InitializeGPSTagNames();
GPSIFD.FromBytes(TIFFData, gps_field.OffsetToValue, Header.LittleEndian);
}
return(true);
}
public string StringValue(ImageFileDirectory ifd, int tag, byte[] buffer)
{
if (buffer == null || ifd == null)
{
return(string.Empty);
}
var field = ifd.GetTag(tag);
if (field == null || (field.Type != 2 && field.Type != 1) || field.Count < 2)
{
return(string.Empty);
}
// Lookout for values less than 4...
if (field.Count <= 4)
{
byte[] bytes = new byte[4];
bytes[0] = (field.Count > 0) ? field.Byte0 : (byte)0;
bytes[1] = (field.Count > 1) ? field.Byte1 : (byte)0;
bytes[2] = (field.Count > 2) ? field.Byte2 : (byte)0;
bytes[3] = (field.Count > 3) ? field.Byte3 : (byte)0;
if (field.Count >= 1)
{
return(System.Text.Encoding.ASCII.GetString(bytes, 0, field.Count).Trim("\0".ToCharArray()));
}
else
{
return(string.Empty);
}
}
if (field.OffsetToValue > 0 && field.Count > 1 && buffer.Length > (field.OffsetToValue + field.Count))
{
// last check...
if (field.Type == 2)
{
return(System.Text.Encoding.ASCII.GetString(buffer, field.OffsetToValue, field.Count).Trim("\0".ToCharArray()));
}
else if (field.Type == 1)
{
// Could be ASCII or Unicode
if (buffer[field.OffsetToValue] != 0x00 && buffer[field.OffsetToValue + 1] == 0x00)
{
// Little Endian Unicode
return(System.Text.Encoding.Unicode.GetString(buffer, field.OffsetToValue, field.Count).Trim("\0".ToCharArray()));
}
else if (buffer[field.OffsetToValue] == 0x00 && buffer[field.OffsetToValue + 1] != 0x00)
{
// Big Endian Unicode
return(System.Text.Encoding.BigEndianUnicode.GetString(buffer, field.OffsetToValue, field.Count).Trim("\0".ToCharArray()));
}
else if (buffer[field.OffsetToValue] != 0x00 && buffer[field.OffsetToValue + 1] != 0x00)
{
return(System.Text.Encoding.UTF8.GetString(buffer, field.OffsetToValue, field.Count).Trim("\0".ToCharArray()));
}
}
}
return(string.Empty);
}
public double DecimalValue(ImageFileDirectory ifd, int tag)
{
return(DecimalValue(ifd, tag, TIFFData));
}
