/// <summary>
/// Asynchronous handler for traversing a DICOM element.
/// </summary>
/// <param name="element">Element to traverse.</param>
/// <returns>true if traversing completed without issues, false otherwise.</returns>
public async Task <bool> OnElementAsync(DicomElement element)
{
WriteTagHeader(element.Tag, element.ValueRepresentation, element.Length);
IByteBuffer buffer = element.Buffer;
if (buffer is EndianByteBuffer)
{
EndianByteBuffer ebb = buffer as EndianByteBuffer;
if (ebb.Endian != Endian.LocalMachine && ebb.Endian == _target.Endian)
{
buffer = ebb.Internal;
}
}
else if (_target.Endian != Endian.LocalMachine)
{
if (element.ValueRepresentation.UnitSize > 1)
{
buffer = new SwapByteBuffer(buffer, element.ValueRepresentation.UnitSize);
}
}
if (element.Length < this._options.LargeObjectSize)
{
_target.Write(buffer.Data, 0, buffer.Size);
}
else
{
await _target.WriteAsync(buffer.Data, 0, buffer.Size).ConfigureAwait(false);
}
return(true);
}
private static async Task WriteBufferAsync(IByteTarget target, IByteBuffer buffer, uint largeObjectSize)
{
var offset = 0;
var remainingSize = buffer.Size;
while (remainingSize > largeObjectSize)
{
var range = buffer.GetByteRange(offset, (int)largeObjectSize);
await target.WriteAsync(range, 0, largeObjectSize).ConfigureAwait(false);
offset += (int)largeObjectSize;
remainingSize -= largeObjectSize;
}
await target.WriteAsync(buffer.GetByteRange(offset, (int)remainingSize), 0, (uint)remainingSize).ConfigureAwait(false);
}
/// <summary>
/// Write DICOM file preamble.
/// </summary>
/// <param name="target">Byte target subject to writing.</param>
private static Task WritePreambleAsync(IByteTarget target)
{
var preamble = new byte[132];
preamble[128] = (byte)'D';
preamble[129] = (byte)'I';
preamble[130] = (byte)'C';
preamble[131] = (byte)'M';
return(target.WriteAsync(preamble, 0, 132));
}
/// <summary>
/// Write DICOM file preamble.
/// </summary>
/// <param name="target">Byte target subject to writing.</param>
private static Task WritePreambleAsync(IByteTarget target)
{
var preamble = new byte[132];
preamble[128] = (byte)'D';
preamble[129] = (byte)'I';
preamble[130] = (byte)'C';
preamble[131] = (byte)'M';
return target.WriteAsync(preamble, 0, 132);
}
