public void MoveForward_shifts_index_for_byte_retrieval()
{
int window = 100;
var buffer = new byte[window * 2];
for (int i = 0; i < buffer.Length; ++i)
{
buffer[i] = (byte)(200 - i);
}
var streamMock = new Mock <MemoryStream>(MockBehavior.Strict);
SetupMockStreamRead(streamMock)
.Returns((byte[] s, int o, int l) =>
{
int actualLength = MathEx.Bounded(0, Math.Min(l, buffer.Length), buffer.Length);
Array.Copy(buffer, 0, s, o, actualLength);
return(actualLength);
});
var buf = new SlidingStreamBuffer(streamMock.Object, window);
buf.Warmup();
Assert.AreEqual(buffer[5], buf[5]);
buf.MoveForward(1);
buf.MoveForward(3);
Assert.AreEqual(buffer[9], buf[5]);
}
private void SendByteDelta(ByteDelta delta, Stream inputStream, Stream outputStream)
{
outputStream.WriteByte(DeltaStreamConstants.NEW_BLOCK_START_MARKER);
outputStream.WriteInt(delta.Length);
var buffer = new byte[delta.Length];
inputStream.Seek(delta.Offset, SeekOrigin.Begin);
long totalRead = 0;
while (totalRead < delta.Length)
{
var toRead = (int)MathEx.Bounded(0, StreamChunkSize, delta.Length - totalRead);
int readLength = inputStream.Read(buffer, 0, toRead);
if (readLength == 0 && totalRead < delta.Length)
{
throw new IOException("Input stream offset out of bounds, or not enough data available");
}
outputStream.Write(buffer, 0, readLength);
totalRead += readLength;
}
}
public void GetBuffer_returns_a_buffer_with_valid_data()
{
int window = 100;
var buffer = new byte[window * 2];
for (int i = 0; i < buffer.Length; ++i)
{
buffer[i] = (byte)(200 - i);
}
var streamMock = new Mock <MemoryStream>(MockBehavior.Strict);
SetupMockStreamRead(streamMock)
.Returns((byte[] s, int o, int l) =>
{
int actualLength = MathEx.Bounded(0, Math.Min(l, buffer.Length), buffer.Length);
Array.Copy(buffer, 0, s, o, actualLength);
return(actualLength);
});
var buf = new SlidingStreamBuffer(streamMock.Object, window);
buf.Warmup();
VerifyBufferPartialEquality(buffer, buf.GetBuffer());
}
public void GetByteAt_retrieves_correct_byte()
{
int window = 100;
var buffer = new byte[window];
for (int i = 0; i < buffer.Length; ++i)
{
buffer[i] = (byte)(200 - i);
}
var streamMock = new Mock <MemoryStream>(MockBehavior.Strict);
SetupMockStreamRead(streamMock)
.Returns((byte[] s, int o, int l) =>
{
int actualLength = MathEx.Bounded(0, Math.Min(l, buffer.Length), buffer.Length);
Array.Copy(buffer, 0, s, o, actualLength);
return(actualLength);
});
var buf = new SlidingStreamBuffer(streamMock.Object, window);
buf.Warmup();
Assert.AreEqual(buffer[5], buf.GetByteAt(5));
}
/// <summary>
/// Returns value between [0, window]
/// </summary>
/// <returns></returns>
public long GetNumBytesAvailable()
{
return(MathEx.Bounded(0, _window, _totalValidBytesInBuffer - _bufferPosition));
}