public DecompressionSegment Add(ReadOnlyMemory <byte> memory)
{
var segment = new DecompressionSegment(memory);
segment.RunningIndex = RunningIndex + Memory.Length;
Next = segment;
return(segment);
}
/// <inheritdoc />
public override unsafe ReadOnlySequence <byte> Decompress(ReadOnlySpan <byte> compressedCiphertext)
{
fixed(byte *pinnedCompressedCiphertext = compressedCiphertext)
{
using var inputStream = new UnmanagedMemoryStream(pinnedCompressedCiphertext, compressedCiphertext.Length, compressedCiphertext.Length, FileAccess.Read);
using var compressionStream = CreateDecompressionStream(inputStream);
var buffer = new byte[Constants.DecompressionBufferLength];
DecompressionSegment?firstSegment = null;
DecompressionSegment?segment = null;
int uncompressedLength = 0;
int readData;
while ((readData = compressionStream.Read(buffer, 0, Constants.DecompressionBufferLength)) != 0)
{
uncompressedLength += readData;
if (firstSegment is null)
{
firstSegment = new DecompressionSegment(buffer.AsMemory(0, readData));
}
else
{
segment = (segment ?? firstSegment).Add(buffer.AsMemory(0, readData));
}
if (readData < Constants.DecompressionBufferLength)
{
break;
}
buffer = new byte[Constants.DecompressionBufferLength];
}
if (segment is null)
{
return(new ReadOnlySequence <byte>(buffer.AsMemory(0, readData)));
}
else
{
return(new ReadOnlySequence <byte>(firstSegment !, 0, segment, readData));
}
}
}
