public override int Read(Span <byte> buffer)
{
EnsureNotDisposed();
var output = new ZSTD_outBuffer_s {
pos = 0, size = (nuint)buffer.Length
};
while (output.pos < output.size)
{
if (input.pos >= input.size)
{
int bytesRead;
if ((bytesRead = innerStream.Read(inputBuffer, 0, inputBufferSize)) == 0)
{
break;
}
input.size = (nuint)bytesRead;
input.pos = 0;
}
lastDecompressResult = DecompressStream(ref output, buffer);
}
return((int)output.pos);
}
public override async ValueTask <int> ReadAsync(Memory <byte> buffer,
CancellationToken cancellationToken = default)
{
EnsureNotDisposed();
var output = new ZSTD_outBuffer_s {
pos = 0, size = (nuint)buffer.Length
};
while (output.pos < output.size)
{
if (input.pos >= input.size)
{
int bytesRead;
if ((bytesRead = await innerStream.ReadAsync(inputBuffer, 0, inputBufferSize, cancellationToken)
.ConfigureAwait(false)) == 0)
{
break;
}
input.size = (nuint)bytesRead;
input.pos = 0;
}
lastDecompressResult = DecompressStream(ref output, buffer.Span);
}
return((int)output.pos);
}
public CompressionStream(Stream stream, int level = Compressor.DefaultCompressionLevel,
int bufferSize = 0)
{
if (stream == null)
{
throw new ArgumentNullException(nameof(stream));
}
if (!stream.CanWrite)
{
throw new ArgumentException("Stream is not writable", nameof(stream));
}
if (bufferSize < 0)
{
throw new ArgumentOutOfRangeException(nameof(bufferSize));
}
innerStream = stream;
compressor = new Compressor(level);
var outputBufferSize =
bufferSize > 0 ? bufferSize : (int)Methods.ZSTD_CStreamOutSize().EnsureZstdSuccess();
outputBuffer = ArrayPool <byte> .Shared.Rent(outputBufferSize);
output = new ZSTD_outBuffer_s {
pos = 0, size = (nuint)outputBufferSize
};
}
internal nuint DecompressStream(ref ZSTD_inBuffer_s input, ref ZSTD_outBuffer_s output)
{
fixed(ZSTD_inBuffer_s *inputPtr = &input)
fixed(ZSTD_outBuffer_s * outputPtr = &output)
{
return(Methods.ZSTD_decompressStream(dctx, outputPtr, inputPtr).EnsureZstdSuccess());
}
}
private unsafe nuint DecompressStream(ref ZSTD_outBuffer_s output, Span <byte> outputBuffer)
{
fixed(byte *inputBufferPtr = inputBuffer)
fixed(byte *outputBufferPtr = outputBuffer)
{
input.src = inputBufferPtr;
output.dst = outputBufferPtr;
return(decompressor.DecompressStream(ref input, ref output));
}
}
