/// <summary>
/// Returns the EXIF data.
/// </summary>
/// <returns>
/// The <see cref="T:byte[]"/>.
/// </returns>
public byte[] GetData()
{
const uint startIndex = 0;
IExifValue exifOffset = GetOffsetValue(this.ifdValues, this.exifValues, ExifTag.SubIFDOffset);
IExifValue gpsOffset = GetOffsetValue(this.ifdValues, this.gpsValues, ExifTag.GPSIFDOffset);
uint ifdLength = this.GetLength(this.ifdValues);
uint exifLength = this.GetLength(this.exifValues);
uint gpsLength = this.GetLength(this.gpsValues);
uint length = ifdLength + exifLength + gpsLength;
if (length == 0)
{
return(Array.Empty <byte>());
}
// two bytes for the byte Order marker 'II' or 'MM', followed by the number 42 (0x2A) and a 0, making 4 bytes total
length += (uint)ExifConstants.LittleEndianByteOrderMarker.Length;
// first IFD offset
length += 4;
byte[] result = new byte[length];
int i = 0;
// The byte order marker for little-endian, followed by the number 42 and a 0
ExifConstants.LittleEndianByteOrderMarker.CopyTo(result.AsSpan(start: i));
i += ExifConstants.LittleEndianByteOrderMarker.Length;
uint ifdOffset = (uint)i - startIndex + 4U;
exifOffset?.TrySetValue(ifdOffset + ifdLength);
gpsOffset?.TrySetValue(ifdOffset + ifdLength + exifLength);
i = WriteUInt32(ifdOffset, result, i);
i = this.WriteHeaders(this.ifdValues, result, i);
i = this.WriteData(startIndex, this.ifdValues, result, i);
if (exifLength > 0)
{
i = this.WriteHeaders(this.exifValues, result, i);
i = this.WriteData(startIndex, this.exifValues, result, i);
}
if (gpsLength > 0)
{
i = this.WriteHeaders(this.gpsValues, result, i);
i = this.WriteData(startIndex, this.gpsValues, result, i);
}
return(result);
}
public void SetValue(TestImageWriteFormat imageFormat)
{
Image <Rgba32> image = TestFile.Create(TestImages.Jpeg.Baseline.Floorplan).CreateRgba32Image();
image.Metadata.ExifProfile.SetValue(ExifTag.Software, "ImageSharp");
IExifValue <string> software = image.Metadata.ExifProfile.GetValue(ExifTag.Software);
Assert.Equal("ImageSharp", software.Value);
// ExifString can set integer values.
Assert.True(software.TrySetValue(15));
Assert.False(software.TrySetValue(15F));
image.Metadata.ExifProfile.SetValue(ExifTag.ShutterSpeedValue, new SignedRational(75.55));
IExifValue <SignedRational> shutterSpeed = image.Metadata.ExifProfile.GetValue(ExifTag.ShutterSpeedValue);
Assert.Equal(new SignedRational(7555, 100), shutterSpeed.Value);
Assert.False(shutterSpeed.TrySetValue(75));
image.Metadata.ExifProfile.SetValue(ExifTag.XResolution, new Rational(150.0));
// We also need to change this value because this overrides XResolution when the image is written.
image.Metadata.HorizontalResolution = 150.0;
IExifValue <Rational> xResolution = image.Metadata.ExifProfile.GetValue(ExifTag.XResolution);
Assert.Equal(new Rational(150, 1), xResolution.Value);
Assert.False(xResolution.TrySetValue("ImageSharp"));
image.Metadata.ExifProfile.SetValue(ExifTag.ReferenceBlackWhite, null);
IExifValue <Rational[]> referenceBlackWhite = image.Metadata.ExifProfile.GetValue(ExifTag.ReferenceBlackWhite);
Assert.Null(referenceBlackWhite.Value);
var expectedLatitude = new Rational[] { new Rational(12.3), new Rational(4.56), new Rational(789.0) };
image.Metadata.ExifProfile.SetValue(ExifTag.GPSLatitude, expectedLatitude);
IExifValue <Rational[]> latitude = image.Metadata.ExifProfile.GetValue(ExifTag.GPSLatitude);
Assert.Equal(expectedLatitude, latitude.Value);
int profileCount = image.Metadata.ExifProfile.Values.Count;
image = WriteAndRead(image, imageFormat);
Assert.NotNull(image.Metadata.ExifProfile);
// Should be 3 less.
// 1 x due to setting of null "ReferenceBlackWhite" value.
// 2 x due to use of non-standard padding tag 0xEA1C listed in EXIF Tool. We can read those values but adhere
// strictly to the 2.3.1 specification when writing. (TODO: Support 2.3.2)
// https://exiftool.org/TagNames/EXIF.html
Assert.Equal(profileCount - 3, image.Metadata.ExifProfile.Values.Count);
software = image.Metadata.ExifProfile.GetValue(ExifTag.Software);
Assert.Equal("15", software.Value);
shutterSpeed = image.Metadata.ExifProfile.GetValue(ExifTag.ShutterSpeedValue);
Assert.Equal(new SignedRational(75.55), shutterSpeed.Value);
xResolution = image.Metadata.ExifProfile.GetValue(ExifTag.XResolution);
Assert.Equal(new Rational(150.0), xResolution.Value);
referenceBlackWhite = image.Metadata.ExifProfile.GetValue(ExifTag.ReferenceBlackWhite);
Assert.Null(referenceBlackWhite);
latitude = image.Metadata.ExifProfile.GetValue(ExifTag.GPSLatitude);
Assert.Equal(expectedLatitude, latitude.Value);
image.Metadata.ExifProfile.Parts = ExifParts.ExifTags;
image = WriteAndRead(image, imageFormat);
Assert.NotNull(image.Metadata.ExifProfile);
Assert.Equal(8, image.Metadata.ExifProfile.Values.Count);
Assert.NotNull(image.Metadata.ExifProfile.GetValue(ExifTag.ColorSpace));
Assert.True(image.Metadata.ExifProfile.RemoveValue(ExifTag.ColorSpace));
Assert.False(image.Metadata.ExifProfile.RemoveValue(ExifTag.ColorSpace));
Assert.Null(image.Metadata.ExifProfile.GetValue(ExifTag.ColorSpace));
Assert.Equal(7, image.Metadata.ExifProfile.Values.Count);
}
public void SetValue(TestImageWriteFormat imageFormat, int expectedProfileValueCount)
{
Image <Rgba32> image = TestFile.Create(TestImages.Jpeg.Baseline.Floorplan).CreateRgba32Image();
image.Metadata.ExifProfile.SetValue(ExifTag.Software, "ImageSharp");
IExifValue <string> software = image.Metadata.ExifProfile.GetValue(ExifTag.Software);
Assert.Equal("ImageSharp", software.Value);
// ExifString can set integer values.
Assert.True(software.TrySetValue(15));
Assert.False(software.TrySetValue(15F));
image.Metadata.ExifProfile.SetValue(ExifTag.ShutterSpeedValue, new SignedRational(75.55));
IExifValue <SignedRational> shutterSpeed = image.Metadata.ExifProfile.GetValue(ExifTag.ShutterSpeedValue);
Assert.Equal(new SignedRational(7555, 100), shutterSpeed.Value);
Assert.False(shutterSpeed.TrySetValue(75));
image.Metadata.ExifProfile.SetValue(ExifTag.XResolution, new Rational(150.0));
// We also need to change this value because this overrides XResolution when the image is written.
image.Metadata.HorizontalResolution = 150.0;
IExifValue <Rational> xResolution = image.Metadata.ExifProfile.GetValue(ExifTag.XResolution);
Assert.Equal(new Rational(150, 1), xResolution.Value);
Assert.False(xResolution.TrySetValue("ImageSharp"));
image.Metadata.ExifProfile.SetValue(ExifTag.ReferenceBlackWhite, null);
IExifValue <Rational[]> referenceBlackWhite = image.Metadata.ExifProfile.GetValue(ExifTag.ReferenceBlackWhite);
Assert.Null(referenceBlackWhite.Value);
var expectedLatitude = new Rational[] { new Rational(12.3), new Rational(4.56), new Rational(789.0) };
image.Metadata.ExifProfile.SetValue(ExifTag.GPSLatitude, expectedLatitude);
IExifValue <Rational[]> latitude = image.Metadata.ExifProfile.GetValue(ExifTag.GPSLatitude);
Assert.Equal(expectedLatitude, latitude.Value);
// todo: duplicate tags
Assert.Equal(2, image.Metadata.ExifProfile.Values.Count(v => (ushort)v.Tag == 59932));
image = WriteAndRead(image, imageFormat);
Assert.NotNull(image.Metadata.ExifProfile);
Assert.Equal(0, image.Metadata.ExifProfile.Values.Count(v => (ushort)v.Tag == 59932));
Assert.Equal(expectedProfileValueCount, image.Metadata.ExifProfile.Values.Count);
software = image.Metadata.ExifProfile.GetValue(ExifTag.Software);
Assert.Equal("15", software.Value);
shutterSpeed = image.Metadata.ExifProfile.GetValue(ExifTag.ShutterSpeedValue);
Assert.Equal(new SignedRational(75.55), shutterSpeed.Value);
xResolution = image.Metadata.ExifProfile.GetValue(ExifTag.XResolution);
Assert.Equal(new Rational(150.0), xResolution.Value);
referenceBlackWhite = image.Metadata.ExifProfile.GetValue(ExifTag.ReferenceBlackWhite);
Assert.Null(referenceBlackWhite);
latitude = image.Metadata.ExifProfile.GetValue(ExifTag.GPSLatitude);
Assert.Equal(expectedLatitude, latitude.Value);
image.Dispose();
}