public void BufferListStreamTest()
{
byte[] buffer = new byte[256];
for (int i = 0; i < buffer.Length; i++)
{
buffer[i] = (byte)i;
}
ArraySegment <byte>[] segments = new ArraySegment <byte>[]
{
new ArraySegment <byte>(buffer, 0, 7),
new ArraySegment <byte>(buffer, 7, 14),
new ArraySegment <byte>(buffer, 21, 28),
new ArraySegment <byte>(buffer, 49, 62),
new ArraySegment <byte>(buffer, 111, 88),
new ArraySegment <byte>(buffer, 199, 55),
new ArraySegment <byte>(buffer, 254, 2),
};
BufferListStream stream = new BufferListStream(segments);
Assert.True(stream.CanRead);
Assert.True(stream.CanSeek);
Assert.True(!stream.CanWrite);
Assert.Equal(buffer.Length, stream.Length);
stream.Seek(119, SeekOrigin.Begin);
Assert.Equal(119, stream.Position);
Assert.Equal(119, stream.ReadByte());
stream.Seek(256, SeekOrigin.Begin);
Assert.Equal(-1, stream.ReadByte());
stream.Seek(-1, SeekOrigin.Current);
Assert.Equal(255, stream.ReadByte());
stream.Seek(-256, SeekOrigin.End);
Assert.Equal(0, stream.ReadByte());
try
{
stream.Seek(-198, SeekOrigin.Current);
Assert.True(false, "Seek should fail with argument out of range exception");
}
catch (ArgumentOutOfRangeException)
{
}
stream.Position = 120;
// The position is 120 now
stream.Seek(99, SeekOrigin.Current);
Assert.Equal(219, stream.Position);
Assert.Equal(219, stream.ReadByte());
// The position is 220 now
stream.Seek(-177, SeekOrigin.Current);
Assert.Equal(43, stream.Position);
Assert.Equal(43, stream.ReadByte());
stream.Seek(0, SeekOrigin.Begin);
for (int i = 0; i < buffer.Length; i++)
{
Assert.Equal(i, stream.Position);
Assert.Equal(i, stream.ReadByte());
}
Assert.Equal(-1, stream.ReadByte());
stream.Seek(25, SeekOrigin.Begin);
byte[] tempBuffer = new byte[86];
int count = stream.Read(tempBuffer, 0, tempBuffer.Length);
Assert.Equal(tempBuffer.Length, count);
Assert.Equal(111, stream.Position);
Assert.Equal(111, stream.ReadByte());
for (int i = 0; i < tempBuffer.Length; i++)
{
Assert.Equal(i + 25, tempBuffer[i]);
}
stream.Seek(25, SeekOrigin.Begin);
tempBuffer = new byte[255];
count = stream.Read(tempBuffer, 0, tempBuffer.Length);
Assert.Equal(231, count);
Assert.Equal(-1, stream.ReadByte());
stream.Seek(25, SeekOrigin.Begin);
bool more = false;
ArraySegment <byte>[] buffers = stream.ReadBuffers(229, true, out more);
Assert.True(more);
Assert.Equal(4, buffers.Length);
Assert.Equal(24, buffers[0].Count);
Assert.Equal(62, buffers[1].Count);
Assert.Equal(88, buffers[2].Count);
Assert.Equal(55, buffers[3].Count);
Assert.Equal(254, stream.Position);
stream.Seek(25, SeekOrigin.Begin);
more = false;
buffers = stream.ReadBuffers(int.MaxValue, true, out more);
Assert.False(more);
Assert.Equal(5, buffers.Length);
Assert.Equal(24, buffers[0].Count);
Assert.Equal(62, buffers[1].Count);
Assert.Equal(88, buffers[2].Count);
Assert.Equal(55, buffers[3].Count);
Assert.Equal(2, buffers[4].Count);
Assert.Equal(256, stream.Position);
stream.Seek(25, SeekOrigin.Begin);
more = false;
buffers = stream.ReadBuffers(231, false, out more);
Assert.False(more);
Assert.Equal(25, stream.Position);
stream.Dispose();
try
{
stream.Position = 100;
Assert.True(false, "Stream is disposed!!");
}
catch (ObjectDisposedException)
{
}
}