public async Task CopyToStreamAsync_ShouldWorkCorrectly(int length)
{
// Arrange
var bytes = new byte[length];
var expected = new byte[length];
for (int i = 0; i < length; i++)
{
bytes[i] = (byte)i;
expected[i] = i % 2 == 0
? (byte)(i + 1)
: (byte)(i - 1);
}
var buffer = new SwapByteBuffer(new MemoryByteBuffer(bytes), 2);
using var ms = new MemoryStream(length);
// Act
await buffer.CopyToStreamAsync(ms, CancellationToken.None).ConfigureAwait(false);
var actual = ms.ToArray();
// Assert
Assert.Equal(expected, actual);
}
/// <summary>
/// Handler for traversing a DICOM element.
/// </summary>
/// <param name="element">Element to traverse.</param>
/// <returns>true if traversing completed without issues, false otherwise.</returns>
/// <remarks>On false return value, the method will invoke the callback method passed in <see cref="IDicomDatasetWalker.OnBeginWalk"/> before returning.</remarks>
public bool OnElement(DicomElement element)
{
WriteTagHeader(element.Tag, element.ValueRepresentation, element.Length);
var buffer = element.Buffer;
if (buffer is EndianByteBuffer)
{
var ebb = (EndianByteBuffer)buffer;
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);
}
}
WriteBuffer(_target, buffer, _options.LargeObjectSize);
return(true);
}
/// <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);
var buffer = element.Buffer;
if (buffer is EndianByteBuffer ebb)
{
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);
}
}
await WriteBufferAsync(_target, buffer, _options.LargeObjectSize).ConfigureAwait(false);
return(true);
}
public void CopyToStream_ShouldWorkCorrectly(int length)
{
// Arrange
var bytes = new byte[length];
var expected = new byte[length];
for (int i = 0; i < length; i++)
{
bytes[i] = (byte)i;
expected[i] = i % 2 == 0
? (byte)(i + 1)
: (byte)(i - 1);
}
var buffer = new SwapByteBuffer(new MemoryByteBuffer(bytes), 2);
using var ms = new MemoryStream(length);
// Act
buffer.CopyToStream(ms);
var actual = ms.ToArray();
// Assert
Assert.Equal(expected, actual);
}
public bool OnElement(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 >= _options.LargeObjectSize)
{
_target.Write(buffer.Data, 0, buffer.Size, OnEndWriteBuffer, null);
return(false);
}
else
{
_target.Write(buffer.Data);
return(true);
}
}
/// <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);
}
/// <inheritdoc />
public override void AddFrame(IByteBuffer data)
{
var buffer = (_element.Buffer as CompositeByteBuffer)
?? throw new DicomImagingException("Expected pixel data element to have a CompositeByteBuffer.");
if (Syntax.SwapPixelData)
{
data = new SwapByteBuffer(data, 2);
}
buffer.Buffers.Add(data);
NumberOfFrames++;
}
public void Data_CompareWithInitializer_ExactMatch()
{
// Arrange
var bytes = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8 };
var expected = new byte[] { 2, 1, 4, 3, 6, 5, 8, 7 };
var buffer = new SwapByteBuffer(new MemoryByteBuffer(bytes), 2);
// Act
var actual = buffer.Data;
// Assert
Assert.Equal(expected.Length, actual.Length);
Assert.Equal(expected, actual);
}
public void GetByteRange_WithOffset_ToEnd_ShouldReturnValidArray(int offset, int count)
{
// Arrange
var bytes = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8 };
var expected = new byte[] { 2, 1, 4, 3, 6, 5, 8, 7 };
var buffer = new SwapByteBuffer(new MemoryByteBuffer(bytes), 2);
// Act
var actual = new byte[count];
buffer.GetByteRange(offset, count, actual);
// Assert
Assert.Equal(count, actual.Length);
Assert.Equal(expected.Skip(offset).Take(count).ToArray(), actual);
}
public override IByteBuffer GetFrame(int frame)
{
int offset = UncompressedFrameSize * frame;
IByteBuffer buffer = new RangeByteBuffer(Element.Buffer, (uint)offset, (uint)UncompressedFrameSize);
if (BytesAllocated == 1 && Syntax.Endian == Endian.Little)
{
buffer = new SwapByteBuffer(buffer, 2);
}
else if (Syntax.Endian == Endian.Big)
{
buffer = new SwapByteBuffer(buffer, 2);
}
return(buffer);
}
public override void AddFrame(IByteBuffer data)
{
if (!(Element.Buffer is CompositeByteBuffer))
{
throw new DicomImagingException("Expected pixel data element to have a CompositeByteBuffer.");
}
CompositeByteBuffer buffer = Element.Buffer as CompositeByteBuffer;
if (BytesAllocated == 1)
{
data = new SwapByteBuffer(data, 2);
}
buffer.Buffers.Add(data);
NumberOfFrames++;
}
public override IByteBuffer GetFrame(int frame)
{
if (frame < 0 || frame >= NumberOfFrames)
{
throw new IndexOutOfRangeException("Requested frame out of range!");
}
int offset = UncompressedFrameSize * frame;
IByteBuffer buffer = new RangeByteBuffer(Element.Buffer, (uint)offset, (uint)UncompressedFrameSize);
// mainly for GE Private Implicit VR Big Endian
if (Syntax.SwapPixelData)
{
buffer = new SwapByteBuffer(buffer, 2);
}
return(buffer);
}
public override IByteBuffer GetFrame(int frame)
{
if (frame < 0 || frame >= NumberOfFrames)
{
throw new IndexOutOfRangeException("Requested frame out of range!");
}
int offset = UncompressedFrameSize * frame;
IByteBuffer buffer = new RangeByteBuffer(Element.Buffer, (uint)offset, (uint)UncompressedFrameSize);
//TODO: trace down the need for this additional byte swap
if (Syntax.Endian == Endian.Big && !Syntax.SwapPixelData)
{
buffer = new SwapByteBuffer(buffer, 2);
}
// mainly for GE Private Implicit VR Little Endian
if (Syntax.SwapPixelData)
{
buffer = new SwapByteBuffer(buffer, 2);
}
return(buffer);
}
public override IByteBuffer GetFrame(int frame)
{
if (frame < 0 || frame >= NumberOfFrames)
{
throw new IndexOutOfRangeException("Requested frame out of range!");
}
IByteBuffer buffer = null;
if (NumberOfFrames == 1)
{
if (Element.Fragments.Count == 1)
{
buffer = Element.Fragments[0];
}
else
{
buffer = new CompositeByteBuffer(Element.Fragments.ToArray());
}
}
else if (Element.Fragments.Count == NumberOfFrames)
{
buffer = Element.Fragments[frame];
}
else if (Element.OffsetTable.Count == NumberOfFrames)
{
uint start = Element.OffsetTable[frame];
uint stop = (Element.OffsetTable.Count == (frame + 1))
? uint.MaxValue
: Element.OffsetTable[frame + 1];
var composite = new CompositeByteBuffer();
uint pos = 0;
int frag = 0;
while (pos < start && frag < Element.Fragments.Count)
{
pos += 8;
pos += Element.Fragments[frag].Size;
frag++;
}
if (pos != start)
{
throw new DicomImagingException("Fragment start position does not match offset table.");
}
while (pos < stop && frag < Element.Fragments.Count)
{
composite.Buffers.Add(Element.Fragments[frag]);
pos += 8;
pos += Element.Fragments[frag].Size;
frag++;
}
if (pos < stop && stop != uint.MaxValue)
{
throw new DicomImagingException(
"Image frame truncated while reading fragments from offset table.");
}
buffer = composite;
}
else
{
throw new DicomImagingException(
"Support for multi-frame images with varying fragment sizes and no offset table has not been implemented.");
}
// mainly for GE Private Implicit VR Little Endian
if (!Syntax.IsEncapsulated && BitsAllocated == 16 && Syntax.SwapPixelData)
{
buffer = new SwapByteBuffer(buffer, 2);
}
return(EndianByteBuffer.Create(buffer, Syntax.Endian, BytesAllocated));
}
/// <summary>
/// Handler for traversing a DICOM element.
/// </summary>
/// <param name="element">Element to traverse.</param>
/// <returns>true if traversing completed without issues, false otherwise.</returns>
/// <remarks>On false return value, the method will invoke the callback method passed in <see cref="IDicomDatasetWalker.OnBeginWalk"/> before returning.</remarks>
public bool OnElement(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 (buffer is CompositeByteBuffer || buffer is StreamByteBuffer || buffer is FileByteBuffer || buffer is PInvokeByteBuffer)
{
buffer.writeToTarget(_target, buffer);
}
else
{
_target.Write(buffer.Data, 0, buffer.Size);
}
//if (buffer is CompositeByteBuffer)// 对CompositeByteBuffer避免调用buffer.Data 以降低内存占用
//{
// var tmpbuffer = buffer as CompositeByteBuffer;
// tmpbuffer.writeToTarget(_target);
//}
//else if (buffer is StreamByteBuffer)
//{
// var tmpbuffer = buffer as StreamByteBuffer;
// tmpbuffer.writeToTarget(_target);
//}
//else if (buffer is FileByteBuffer)
//{
// var fb = buffer as FileByteBuffer;
// const int seg = 4096000;
// int gcd = (int)(fb.Size / seg);
// int gcf = (int)(fb.Size % seg);
// if (gcd == 0)
// {
// _target.Write(fb.Data, 0, fb.Size);
// }
// else
// {
// for (int i = 0; i < gcd; i++)
// {
// var rgBuffer = fb.GetByteRange(i * seg, seg);
// _target.Write(rgBuffer, 0, seg);
// rgBuffer = null;
// }
// if (gcf > 0)
// {
// var rgBuffer = fb.GetByteRange(gcd * seg, gcf);
// _target.Write(rgBuffer, 0, (uint)gcf);
// rgBuffer = null;
// }
// }
//}
//else if (buffer is PInvokeByteBuffer)
//{
// var pb = buffer as PInvokeByteBuffer;
// var rowBuffer = new byte[pb.RowBufferSize];
// for (int i = 0; i < pb.Height; i++)
// {
// pb.GetByteRange(i, rowBuffer);
// _target.Write(rowBuffer, 0, (uint)rowBuffer.Length);
// }
// rowBuffer = null;
//}
//else
//{
// _target.Write(buffer.Data, 0, buffer.Size);
//}
return(true);
}