public static async Task <TiffIfd?> ReadNextIfdAsync(TiffIfd ifd, Stream stream, ByteOrder byteOrder)
{
if (ifd.NextIfdReference == null)
{
return(null);
}
var nextIfd = await ReadIfdAsync(ifd.NextIfdReference.Value, stream, byteOrder);
return(nextIfd);
}
private static Task <string> ReadStringAsync(TiffIfd ifd, ushort tag, Stream stream, ByteOrder byteOrder)
{
var entry = TiffReader.GetTiffIfdEntry(ifd, tag);
if (entry == null)
{
return(Task.FromResult <string>(null));
}
else
{
return(entry.Value.ReadStringAsync(stream, byteOrder));
}
}
public static async Task <TiffIfdReference[]> ReadSubIfdReferencesAsync(TiffIfd ifd, Stream stream, ByteOrder byteOrder)
{
var subIfdsEntry = TiffReader.GetTiffIfdEntry(ifd, TiffTags.SubIFDs);
if (subIfdsEntry != null)
{
return(await subIfdsEntry.Value.ReadIfdReferenceArrayAsync(stream, byteOrder));
}
else
{
return(Array.Empty <TiffIfdReference>());
}
}
public static Task <uint[]> ReadBitsPerSampleAsync(this TiffIfd ifd, Stream stream, ByteOrder byteOrder)
{
var entry = TiffReader.GetTiffIfdEntry(ifd, TiffTags.BitsPerSample);
if (entry == null)
{
return(Task.FromResult(new uint[] { 1 }));
}
else
{
return(entry.Value.ReadIntegerArrayAsync(stream, byteOrder));
}
}
private async static Task <Rational?> ReadRationalAsync(TiffIfd ifd, ushort tag, Stream stream, ByteOrder byteOrder)
{
var entry = TiffReader.GetTiffIfdEntry(ifd, tag);
if (entry == null)
{
return(null);
}
else
{
return(await entry.Value.ReadRationalAsync(stream, byteOrder));
}
}
public static double GetGrayResponseUnit(this TiffIfd ifd, ByteOrder byteOrder)
{
var entry = TiffReader.GetTiffIfdEntry(ifd, TiffTags.GrayResponseUnit);
if (entry == null)
{
return(0.01);
}
else
{
var value = entry.Value.GetInteger(byteOrder);
return(Math.Pow(10, -value));
}
}
public async static Task <DateTimeOffset?> ReadDateTimeAsync(this TiffIfd ifd, Stream stream, ByteOrder byteOrder)
{
var entry = TiffReader.GetTiffIfdEntry(ifd, TiffTags.DateTime);
if (entry == null)
{
return(null);
}
else
{
var str = await entry.Value.ReadStringAsync(stream, byteOrder);
return(DateTimeOffset.ParseExact(str, "yyyy:MM:dd HH:mm:ss", CultureInfo.InvariantCulture, DateTimeStyles.AssumeUniversal));
}
}
public async static Task <TiffExtraSamples[]> ReadExtraSamplesAsync(this TiffIfd ifd, Stream stream, ByteOrder byteOrder)
{
var entry = TiffReader.GetTiffIfdEntry(ifd, TiffTags.ExtraSamples);
if (entry == null)
{
return(new TiffExtraSamples[0]);
}
else
{
var values = await entry.Value.ReadIntegerArrayAsync(stream, byteOrder);
var result = new TiffExtraSamples[values.Length];
for (int i = 0; i < values.Length; i++)
{
result[i] = (TiffExtraSamples)values[i];
}
return(result);
}
}
public static Task <string> ReadCopyrightAsync(this TiffIfd ifd, Stream stream, ByteOrder byteOrder) => ReadStringAsync(ifd, TiffTags.Copyright, stream, byteOrder);
public static Task <uint[]> ReadColorMapAsync(this TiffIfd ifd, Stream stream, ByteOrder byteOrder) => ReadIntegerArrayAsync(ifd, TiffTags.ColorMap, stream, byteOrder);
public static TiffCompression GetCompression(this TiffIfd ifd, ByteOrder byteOrder)
{
var entry = TiffReader.GetTiffIfdEntry(ifd, TiffTags.Compression);
return(entry == null ? TiffCompression.None : (TiffCompression)entry.Value.GetInteger(byteOrder));
}
public static Task <uint[]> ReadGrayResponseCurveAsync(this TiffIfd ifd, Stream stream, ByteOrder byteOrder) => ReadIntegerArrayAsync(ifd, TiffTags.GrayResponseCurve, stream, byteOrder);
public static uint GetSamplesPerPixel(this TiffIfd ifd, ByteOrder byteOrder) => GetInteger(ifd, TiffTags.SamplesPerPixel, byteOrder) ?? 1;
// Helper functions
private static uint?GetInteger(TiffIfd ifd, ushort tag, ByteOrder byteOrder)
{
var entry = TiffReader.GetTiffIfdEntry(ifd, tag);
return(entry?.GetInteger(byteOrder));
}
public static int SizeOfIfd(TiffIfd ifd) => ifd.Entries.Length * SIZEOF_IFDENTRY + 6;
public static TiffThreshholding GetThreshholding(this TiffIfd ifd, ByteOrder byteOrder)
{
var entry = TiffReader.GetTiffIfdEntry(ifd, TiffTags.Threshholding);
return(entry == null ? TiffThreshholding.None : (TiffThreshholding)entry.Value.GetInteger(byteOrder));
}
public static Task <Rational?> ReadYResolutionAsync(this TiffIfd ifd, Stream stream, ByteOrder byteOrder) => ReadRationalAsync(ifd, TiffTags.YResolution, stream, byteOrder);
public static TiffSubfileType?GetSubfileType(this TiffIfd ifd, ByteOrder byteOrder)
{
var entry = TiffReader.GetTiffIfdEntry(ifd, TiffTags.SubfileType);
return(entry == null ? null : (TiffSubfileType?)entry.Value.GetInteger(byteOrder));
}
public static Task <uint[]> ReadStripByteCountsAsync(this TiffIfd ifd, Stream stream, ByteOrder byteOrder) => ReadIntegerArrayAsync(ifd, TiffTags.StripByteCounts, stream, byteOrder);
public static Task <string> ReadSoftwareAsync(this TiffIfd ifd, Stream stream, ByteOrder byteOrder) => ReadStringAsync(ifd, TiffTags.Software, stream, byteOrder);
public static TiffFillOrder GetFillOrder(this TiffIfd ifd, ByteOrder byteOrder)
{
var entry = TiffReader.GetTiffIfdEntry(ifd, TiffTags.FillOrder);
return(entry == null ? TiffFillOrder.MostSignificantBitFirst : (TiffFillOrder)entry.Value.GetInteger(byteOrder));
}
public static TiffPhotometricInterpretation?GetPhotometricInterpretation(this TiffIfd ifd, ByteOrder byteOrder)
{
var entry = TiffReader.GetTiffIfdEntry(ifd, TiffTags.PhotometricInterpretation);
return(entry == null ? null : (TiffPhotometricInterpretation?)entry.Value.GetInteger(byteOrder));
}
public static Task <uint[]> ReadFreeOffsetsAsync(this TiffIfd ifd, Stream stream, ByteOrder byteOrder) => ReadIntegerArrayAsync(ifd, TiffTags.FreeOffsets, stream, byteOrder);
public static TiffResolutionUnit GetResolutionUnit(this TiffIfd ifd, ByteOrder byteOrder)
{
var entry = TiffReader.GetTiffIfdEntry(ifd, TiffTags.ResolutionUnit);
return(entry == null ? TiffResolutionUnit.Inch : (TiffResolutionUnit)entry.Value.GetInteger(byteOrder));
}
public static TiffOrientation GetOrientation(this TiffIfd ifd, ByteOrder byteOrder)
{
var entry = TiffReader.GetTiffIfdEntry(ifd, TiffTags.Orientation);
return(entry == null ? TiffOrientation.TopLeft : (TiffOrientation)entry.Value.GetInteger(byteOrder));
}
public static uint GetRowsPerStrip(this TiffIfd ifd, ByteOrder byteOrder) => GetInteger(ifd, TiffTags.RowsPerStrip, byteOrder) ?? UInt32.MaxValue;
public static TiffIfdEntry?GetTiffIfdEntry(TiffIfd ifd, ushort tag)
{
var entry = ifd.Entries.FirstOrDefault <TiffIfdEntry>(e => e.Tag == tag);
return(entry.Tag == 0 ? (TiffIfdEntry?)null : entry);
}
public static uint?GetCellWidth(this TiffIfd ifd, ByteOrder byteOrder) => GetInteger(ifd, TiffTags.CellWidth, byteOrder);
// Baseline TIFF fields
public static Task <string> ReadArtistAsync(this TiffIfd ifd, Stream stream, ByteOrder byteOrder) => ReadStringAsync(ifd, TiffTags.Artist, stream, byteOrder);
public static TiffPlanarConfiguration GetPlanarConfiguration(this TiffIfd ifd, ByteOrder byteOrder)
{
var entry = TiffReader.GetTiffIfdEntry(ifd, TiffTags.PlanarConfiguration);
return(entry == null ? TiffPlanarConfiguration.Chunky : (TiffPlanarConfiguration)entry.Value.GetInteger(byteOrder));
}