public void TryCopyTo_Empty()
{
var reader = new ByteBufferReader(ReadOnlySequence <byte> .Empty);
// Nothing to nothing is always possible
Assert.True(reader.TryCopyTo(Span <byte> .Empty));
// Nothing to something doesn't work
Assert.False(reader.TryCopyTo(new byte[1]));
}
public void TryCopyTo_Multisegment()
{
ReadOnlySequence <byte> chars = SequenceFactory.Create(new byte[][] {
new byte[] { (byte)'A' },
new byte[] { (byte)'B', (byte)'C' },
new byte[] { (byte)'D', (byte)'E', (byte)'F' }
});
ReadOnlySpan <byte> linear = new byte[] { (byte)'A', (byte)'B', (byte)'C', (byte)'D', (byte)'E', (byte)'F' };
var reader = new ByteBufferReader(chars);
// Something to nothing is always possible
Assert.True(reader.TryCopyTo(Span <byte> .Empty));
Span <byte> buffer;
// Read out ABCDEF, ABCDE, etc.
for (int i = linear.Length; i > 0; i--)
{
buffer = new byte[i];
Assert.True(reader.TryCopyTo(buffer));
Assert.True(buffer.SequenceEqual(linear.Slice(0, i)));
}
buffer = new byte[1];
// Read out one at a time and move through
for (int i = 0; i < linear.Length; i++)
{
Assert.True(reader.TryCopyTo(buffer));
Assert.True(reader.TryRead(out byte value));
Assert.Equal(buffer[0], value);
}
// Trying to get more data than there is will fail
Assert.False(reader.TryCopyTo(new byte[reader.Remaining + 1]));
}