public void FixedBufferCanAdjustReadOffsetOnOverwrite()
{
int dataLength = 100;
int bufferLength = 30;
int readOffset = 10;
int writeInitial = 10;
int readInitial = 5;
FixedSizeBuffer <int> fixedSizeBuffer = new FixedSizeBuffer <int>(bufferLength);
var numbers = Enumerable.Range(0, dataLength).ToArray();
var readData = new int[numbers.Length + readOffset];
fixedSizeBuffer.Write(Enumerable.Range(5000, writeInitial).ToArray(), 0, writeInitial);
fixedSizeBuffer.Read(readData, 0, readInitial);
Array.Clear(readData, 0, readData.Length);
int written = fixedSizeBuffer.Write(numbers, 0, numbers.Length);
Assert.AreEqual(numbers.Length, written);
Assert.AreEqual(fixedSizeBuffer.Buffered, bufferLength);
int read = fixedSizeBuffer.Read(readData, readOffset, readData.Length);
Assert.AreEqual(read, bufferLength);
Assert.AreEqual(fixedSizeBuffer.Buffered, 0);
Array.Copy(readData, readOffset, readData, 0, dataLength);
Array.Copy(numbers, dataLength - bufferLength, numbers, 0, bufferLength);
for (int i = 0; i < bufferLength; i++)
{
Assert.AreEqual(readData[i], numbers[i]);
}
}
public override int Read(byte[] buffer, int offset, int count)
{
int read0 = 0;
int read1 = 0;
Array.Clear(buffer, offset, count - offset);
do
{
read1 = _buffer.Read(buffer, offset + read0, count - read0);
read0 += read1;
} while (read0 < count /* && (read1 != 0 && Position == Length)*/); //todo: abort if read1 = 0?
return(read0);
}
/// <summary>
/// Reads a sequence of bytes from the internal buffer of the <see cref="WriteableBufferingSource" /> and advances the position within the internal buffer by the
/// number of bytes read.
/// </summary>
/// <param name="buffer">
/// An array of bytes. When this method returns, the <paramref name="buffer" /> contains the specified
/// byte array with the values between <paramref name="offset" /> and (<paramref name="offset" /> +
/// <paramref name="count" /> - 1) replaced by the bytes read from the internal buffer.
/// </param>
/// <param name="offset">
/// The zero-based byte offset in the <paramref name="buffer" /> at which to begin storing the data
/// read from the internal buffer.
/// </param>
/// <param name="count">The maximum number of bytes to read from the internal buffer.</param>
/// <returns>The total number of bytes read into the <paramref name="buffer"/>.</returns>
public int Read(byte[] buffer, int offset, int count)
{
lock (_bufferlock)
{
int read = _buffer.Read(buffer, offset, count);
if (FillWithZeros)
{
if (read < count)
{
Array.Clear(buffer, offset + read, count - read);
}
return(count);
}
return(read);
}
}
public int Read(byte[] buffer, int offset, int count)
{
int read = 0;
Array.Clear(buffer, offset, count - offset);
if (_buffer.Buffered < _buffer.Length / 2)
{
return(count);
}
else
{
do
{
read += _buffer.Read(buffer, offset + read, count - read);
} while (read < count);
return(read);
}
}
/// <summary>
/// Reads a sequence of bytes from internal buffer and advances the position by the
/// number of bytes read.
/// </summary>
/// <param name="buffer">
/// An array of bytes. When this method returns, the <paramref name="buffer" /> contains the specified
/// byte array with the values between <paramref name="offset" /> and (<paramref name="offset" /> +
/// <paramref name="count" /> - 1) replaced by the bytes read from the <see cref="BufferSource"/>.
/// </param>
/// <param name="offset">
/// The zero-based byte offset in the <paramref name="buffer" /> at which to begin storing the data
/// read from the current stream.
/// </param>
/// <param name="count">The maximum number of bytes to read from the <see cref="BufferSource"/>.</param>
/// <returns>The total number of bytes read into the buffer.</returns>
/// <exception cref="ObjectDisposedException">BufferSource</exception>
public override int Read(byte[] buffer, int offset, int count)
{
if (_disposing)
{
throw new ObjectDisposedException("BufferSource");
}
int read0 = 0, read1;
Array.Clear(buffer, offset, count - offset);
do
{
read1 = _buffer.Read(buffer, offset + read0, count - read0);
read0 += read1;
} while (read0 < count &&
!(read1 <= 0 && _eofCounter >= 5)); //if the buffering thread could not read any data for 5 times, we abort here
return(read0);
}
public void FixedBufferCanReadWrite()
{
int length = 100;
int readOffset = 10;
FixedSizeBuffer <int> fixedSizeBuffer = new FixedSizeBuffer <int>(length);
var numbers = Enumerable.Range(0, length).ToArray();
var readData = new int[numbers.Length + readOffset];
int written = fixedSizeBuffer.Write(numbers, 0, numbers.Length);
Assert.AreEqual(numbers.Length, written);
Assert.AreEqual(fixedSizeBuffer.Buffered, numbers.Length);
fixedSizeBuffer.Read(readData, readOffset, length);
Assert.AreEqual(fixedSizeBuffer.Buffered, 0);
Array.Copy(readData, readOffset, readData, 0, length);
for (int i = 0; i < length; i++)
{
Assert.AreEqual(readData[i], numbers[i]);
}
}
