private void Align(BoundedStream stream, long?alignment, bool pad = false)
{
if (alignment == null)
{
throw new ArgumentNullException(nameof(alignment));
}
var position = stream.RelativePosition;
var delta = (alignment.Value - position % alignment.Value) % alignment.Value;
if (delta == 0)
{
return;
}
if (pad)
{
var padding = new byte[delta];
stream.Write(padding, 0, padding.Length);
}
else
{
for (int i = 0; i < delta; i++)
{
if (stream.ReadByte() < 0)
{
break;
}
}
}
}
public void TestPosition()
{
using (MemoryStream baseStream = new MemoryStream(_buff)) {
using (BoundedStream boundedStream = new BoundedStream(baseStream, 10, 100)) {
Assert.AreEqual(0, boundedStream.Position);
boundedStream.ReadByte();
Assert.AreEqual(1, boundedStream.Position);
boundedStream.Position = 0;
Assert.AreEqual(0, boundedStream.Position);
Assert.ThrowsException <IOException>(() => boundedStream.Position = -1);
Assert.AreEqual(0, boundedStream.Position);
Assert.ThrowsException <IOException>(() => boundedStream.Position = boundedStream.UpperBound - boundedStream.LowerBound + 1);
Assert.AreEqual(0, boundedStream.Position);
Assert.ThrowsException <IOException>(() => boundedStream.Seek(-1, SeekOrigin.Begin));
Assert.AreEqual(0, boundedStream.Position);
Assert.ThrowsException <IOException>(() => boundedStream.Seek(-1, SeekOrigin.End));
Assert.AreEqual(0, boundedStream.Position);
Assert.ThrowsException <IOException>(() => boundedStream.Seek(-1, SeekOrigin.Current));
Assert.AreEqual(0, boundedStream.Position);
boundedStream.Seek(1, SeekOrigin.Begin);
Assert.AreEqual(1, boundedStream.Position);
}
}
}
private static void Seek(BoundedStream BoundedStream)
{
while (true)
{
var Byte = BoundedStream.ReadByte();
switch (Byte)
{
case 0b00000000:
return;
case 0b11000000:
BoundedStream.ReadByte();
return;
}
}
}
public void TestReadingWorks()
{
var ms = GetPopulatedMemoryStream(10);
var bs = new BoundedStream(ms, 5, 3);
var b = bs.ReadByte();
Assert.AreEqual(5, b);
}
public void TestSeekFromEnd()
{
var ms = GetPopulatedMemoryStream(10);
var bs = new BoundedStream(ms, 1, 6);
bs.Seek(-2, SeekOrigin.End);
var b = bs.ReadByte();
Assert.AreEqual(5, b);
}
public void TestSeekFromBegining()
{
var ms = GetPopulatedMemoryStream(10);
var bs = new BoundedStream(ms, 1, 6);
bs.Seek(2, SeekOrigin.Begin);
var b = bs.ReadByte();
Assert.AreEqual(3, b);
}
public void TestSeekBackFromCurrent()
{
var ms = GetPopulatedMemoryStream(10);
var bs = new BoundedStream(ms, 1, 6);
bs.Position = 3;
bs.Seek(-1, SeekOrigin.Current);
var b = bs.ReadByte();
Assert.AreEqual(3, b);
}
public void TestRead()
{
using (MemoryStream baseStream = new MemoryStream(_buff)) {
using (BoundedStream boundedStream = new BoundedStream(baseStream, 10, 100)) {
Assert.AreEqual((boundedStream.Position + boundedStream.LowerBound) % 256, boundedStream.ReadByte() % 256);
Assert.AreEqual((boundedStream.Position + boundedStream.LowerBound) % 256, boundedStream.ReadByte() % 256);
// Partial reads to upper bound
boundedStream.Seek(1, SeekOrigin.End);
byte[] buff = new byte[2] {
0, 200
};
byte[] expectedBuff = new byte[2] {
99, 200
};
boundedStream.Read(buff, 0, buff.Length);
CollectionAssert.AreEqual(expectedBuff, buff);
}
}
}
