internal async Task <TiffStreamRegion> WriteAlignedValues(TiffValueCollection <TiffSRational> values, CancellationToken cancellationToken)
{
EnsureNotDisposed();
cancellationToken.ThrowIfCancellationRequested();
Debug.Assert(_writer != null);
long position = await AlignToWordBoundaryAsync(cancellationToken).ConfigureAwait(false);
const int ElementSize = 2 * sizeof(int);
int byteCount = ElementSize * values.Count;
byte[] buffer = ArrayPool <byte> .Shared.Rent(byteCount);
try
{
MemoryMarshal.AsBytes(values.GetOrCreateArray().AsSpan()).CopyTo(buffer);
await _writer !.WriteAsync(position, new ArraySegment <byte>(buffer, 0, byteCount), cancellationToken).ConfigureAwait(false);
AdvancePosition(byteCount);
}
finally
{
ArrayPool <byte> .Shared.Return(buffer);
}
return(new TiffStreamRegion(position, byteCount));
}
/// <summary>
/// Read the values of <see cref="TiffTag.WhitePoint"/>.
/// </summary>
/// <param name="tagReader">The tag reader to use.</param>
/// <param name="cancellationToken">The <see cref="CancellationToken"/> that fires if the user want to stop the current task.</param>
/// <returns>A <see cref="ValueTask{TiffValueCollection}"/> that completes when the value of the tag is read and return the read values.</returns>
public static ValueTask <TiffRational[]> ReadWhitePointAsync(this TiffTagReader tagReader, CancellationToken cancellationToken = default)
{
ValueTask <TiffValueCollection <TiffRational> > valueTask = tagReader.ReadRationalFieldAsync(TiffTag.WhitePoint, sizeLimit: -1, cancellationToken);
if (valueTask.IsCompletedSuccessfully)
{
TiffValueCollection <TiffRational> result = valueTask.GetAwaiter().GetResult();
return(new ValueTask <TiffRational[]>(result.GetOrCreateArray()));
}
return(new ValueTask <TiffRational[]>(TransformValueTaskAsync(valueTask)));
/// <summary>
/// Read the values of <see cref="TiffTag.JPEGTables"/>.
/// </summary>
/// <param name="tagReader">The tag reader to use.</param>
/// <param name="cancellationToken">The <see cref="CancellationToken"/> that fires if the user want to stop the current task.</param>
/// <returns>A <see cref="ValueTask{TiffValueCollection}"/> that completes when the value of the tag is read and return the read values.</returns>
public static ValueTask <byte[]> ReadJPEGTablesAsync(this TiffTagReader tagReader, CancellationToken cancellationToken = default)
{
ValueTask <TiffValueCollection <byte> > valueTask = tagReader.ReadByteFieldAsync(TiffTag.JPEGTables, sizeLimit: -1, cancellationToken);
if (valueTask.IsCompletedSuccessfully)
{
TiffValueCollection <byte> result = valueTask.GetAwaiter().GetResult();
return(new ValueTask <byte[]>(result.GetOrCreateArray()));
}
return(new ValueTask <byte[]>(TransformValueTaskAsync(valueTask)));
/// <summary>
/// Read the values of <see cref="TiffTag.HalftoneHints"/>.
/// </summary>
/// <param name="tagReader">The tag reader to use.</param>
/// <param name="cancellationToken">The <see cref="CancellationToken"/> that fires if the user want to stop the current task.</param>
/// <returns>A <see cref="ValueTask{TiffValueCollection}"/> that completes when the value of the tag is read and return the read values.</returns>
public static ValueTask <ushort[]> ReadHalftoneHintsAsync(this TiffTagReader tagReader, CancellationToken cancellationToken = default)
{
ValueTask <TiffValueCollection <ushort> > valueTask = tagReader.ReadShortFieldAsync(TiffTag.HalftoneHints, sizeLimit: -1, cancellationToken);
if (valueTask.IsCompletedSuccessfully)
{
TiffValueCollection <ushort> result = valueTask.GetAwaiter().GetResult();
return(new ValueTask <ushort[]>(result.GetOrCreateArray()));
}
return(new ValueTask <ushort[]>(TransformValueTaskAsync(valueTask)));
static async Task <TiffRational[]> TransformValueTaskAsync(ValueTask <TiffValueCollection <TiffRational> > valueTask)
{
TiffValueCollection <TiffRational> result = await valueTask.ConfigureAwait(false);
return(result.GetOrCreateArray());
}