public void TestRational()
{
var defaultRational = new TiffRational();
Assert.Equal((uint)0, defaultRational.Numerator);
Assert.Equal((uint)0, defaultRational.Denominator);
Assert.Equal(0 / 0f, defaultRational.ToSingle());
Assert.Equal(0 / 0d, defaultRational.ToDouble());
var rational1 = new TiffRational(1, 2);
Assert.Equal((uint)1, rational1.Numerator);
Assert.Equal((uint)2, rational1.Denominator);
Assert.False(rational1.Equals(defaultRational));
Assert.False(defaultRational.Equals(rational1));
Assert.False(rational1 == defaultRational);
Assert.False(defaultRational == rational1);
Assert.True(rational1 != defaultRational);
Assert.True(defaultRational != rational1);
Assert.False(rational1.GetHashCode() == defaultRational.GetHashCode());
Assert.Equal(1 / 2f, rational1.ToSingle());
Assert.Equal(1 / 2d, rational1.ToDouble());
var rational2 = new TiffRational(1, 2);
Assert.True(rational1.Equals(rational2));
Assert.True(rational2.Equals(rational1));
Assert.True(rational1 == rational2);
Assert.True(rational2 == rational1);
Assert.False(rational1 != rational2);
Assert.False(rational2 != rational1);
Assert.True(rational1.GetHashCode() == rational2.GetHashCode());
}
/// <summary>
/// Returns the TIFF tag information.
/// </summary>
/// <param name="tagId">The tag identifier.</param>
/// <param name="tagValue">The tag value.</param>
private bool GetTiffTagInfo(out int tagId, out object tagValue)
{
tagId = 0;
tagValue = (int)0;
using (AddTiffTagForm dlg = new AddTiffTagForm())
{
if (dlg.ShowDialog() == DialogResult.OK)
{
tagId = dlg.TagId;
// get the tag data value
switch (dlg.TagDataType)
{
case TiffTagDataType.Ascii:
tagValue = dlg.StringValue;
break;
case TiffTagDataType.Short:
tagValue = (ushort)dlg.IntegerValue;
break;
case TiffTagDataType.SShort:
tagValue = (short)dlg.IntegerValue;
break;
case TiffTagDataType.Long:
tagValue = (uint)dlg.IntegerValue;
break;
case TiffTagDataType.SLong:
tagValue = (int)dlg.IntegerValue;
break;
case TiffTagDataType.Float:
tagValue = (float)dlg.DoubleValue;
break;
case TiffTagDataType.Double:
tagValue = dlg.DoubleValue;
break;
case TiffTagDataType.Rational:
// create long rational value
tagValue = new TiffRational((uint)dlg.NumeratorValue, (uint)dlg.DenominatorValue);
break;
case TiffTagDataType.SRational:
// create short long rational value
tagValue = new TiffSRational((int)dlg.NumeratorValue, (uint)dlg.DenominatorValue);
break;
}
return(true);
}
}
return(false);
}
public async Task TestRationalCompatibility(int length, bool bigTiff)
{
TiffRational[] refData = new TiffRational[length];
new Random(42).NextBytes(MemoryMarshal.AsBytes(refData.AsSpan()));
using Stream stream = await GenerateTiffAsync(bigTiff, async ifd =>
{
await ifd.WriteTagAsync((TiffTag) 0x1234, TiffValueCollection.UnsafeWrap(refData));
});
await using (TiffFileReader reader = await TiffFileReader.OpenAsync(stream, leaveOpen: true))
{
TiffImageFileDirectory ifd = await reader.ReadImageFileDirectoryAsync();
TiffFieldReader fieldReader = await reader.CreateFieldReaderAsync();
TiffImageFileDirectoryEntry entry = ifd.FindEntry((TiffTag)0x1234);
Assert.Equal((TiffTag)0x1234, entry.Tag);
// Byte
await TestInvalidConversionAsync <byte>(fieldReader, entry, nameof(fieldReader.ReadByteFieldAsync), refData.Length);
// SSbyte
await TestInvalidConversionAsync <sbyte>(fieldReader, entry, nameof(fieldReader.ReadSByteFieldAsync), refData.Length);
// Short
await TestInvalidConversionAsync <ushort>(fieldReader, entry, nameof(fieldReader.ReadShortFieldAsync), refData.Length);
// SShort
await TestInvalidConversionAsync <short>(fieldReader, entry, nameof(fieldReader.ReadSShortFieldAsync), refData.Length);
// Long
await TestInvalidConversionAsync <uint>(fieldReader, entry, nameof(fieldReader.ReadLongFieldAsync), refData.Length);
// SLong
await TestInvalidConversionAsync <int>(fieldReader, entry, nameof(fieldReader.ReadSLongFieldAsync), refData.Length);
// Float
await TestInvalidConversionAsync <float>(fieldReader, entry, nameof(fieldReader.ReadFloatFieldAsync), refData.Length);
// Double
await TestInvalidConversionAsync <double>(fieldReader, entry, nameof(fieldReader.ReadDoubleFieldAsync), refData.Length);
// Rational
await TestValidConversionAsync(fieldReader, entry, nameof(fieldReader.ReadRationalFieldAsync), refData);
// SRational
await TestInvalidConversionAsync <TiffSRational>(fieldReader, entry, nameof(fieldReader.ReadSRationalFieldAsync), refData.Length);
}
}
