public void TestUnalignedRead()
{
BitStreamList lst = new BitStreamList();
var bs1 = new BitStream();
bs1.WriteBits(0xaa, 12);
lst.Add(bs1);
var bs2a = new BitStream();
bs2a.WriteBits(0x7, 3);
lst.Add(bs2a);
var bs2b = new BitStream();
bs2b.WriteBits(0x7, 4);
lst.Add(bs2b);
var bs3 = new BitStream();
bs3.WriteBits(0x10a, 18);
lst.Add(bs3);
lst.SeekBits(10, SeekOrigin.Begin);
Assert.AreEqual(37, lst.LengthBits);
var buf = new byte[4];
int len = lst.Read(buf, 0, buf.Length);
Assert.AreEqual(3, len); // 2bit + 7bit + 18bit = 27bit = 3 bytes
Assert.AreEqual(37, lst.LengthBits);
Assert.AreEqual(34, lst.PositionBits);
Assert.AreEqual(4, lst.Length);
Assert.AreEqual(4, lst.Position);
// 00 00 10 10 10 10 11 10 11 10 00 00 00 00 10 00 01 01 0
// 10 11 10 11 10 00 00 00 00 10 00 01
// 0xbb 0x80 0x21
Assert.AreEqual(new byte[] { 0xbb, 0x80, 0x21, 0x00 }, buf);
lst.SeekBits(0, SeekOrigin.Begin);
int bits = (int)lst[0].LengthBits + 1;
ulong tmp;
int cnt = lst.ReadBits(out tmp, bits);
Assert.AreEqual(bits, cnt);
}
public void TestList()
{
BitStreamList lst = new BitStreamList();
lst.Add(new BitStream(new MemoryStream(Encoding.ASCII.GetBytes("Hello"))));
lst.Add(new BitStream(new MemoryStream(Encoding.ASCII.GetBytes("World"))));
Assert.AreEqual(0, lst.Position);
Assert.AreEqual(0, lst.PositionBits);
Assert.AreEqual(10, lst.Length);
Assert.AreEqual(80, lst.LengthBits);
long ret = lst.SeekBits(12, SeekOrigin.Begin);
Assert.AreEqual(12, ret);
Assert.AreEqual(1, lst.Position);
Assert.AreEqual(12, lst.PositionBits);
ret = lst.Seek(2, SeekOrigin.Current);
Assert.AreEqual(3, ret);
Assert.AreEqual(3, lst.Position);
Assert.AreEqual(28, lst.PositionBits);
ret = lst.SeekBits(-12, SeekOrigin.End);
Assert.AreEqual(68, ret);
Assert.AreEqual(8, lst.Position);
Assert.AreEqual(68, lst.PositionBits);
ulong bits;
int b = lst.ReadBits(out bits, 15);
Assert.AreEqual(12, b);
Assert.AreEqual(0xc64, bits);
Assert.AreEqual(lst.Length, lst.Position);
Assert.AreEqual(lst.LengthBits, lst.PositionBits);
lst.Add(new BitStream(new MemoryStream(Encoding.ASCII.GetBytes("!"))));
Assert.AreEqual(10, lst.Position);
Assert.AreEqual(80, lst.PositionBits);
Assert.AreEqual(11, lst.Length);
Assert.AreEqual(88, lst.LengthBits);
ret = lst.SeekBits(-12, SeekOrigin.End);
Assert.AreEqual(76, ret);
Assert.AreEqual(9, lst.Position);
Assert.AreEqual(76, lst.PositionBits);
b = lst.ReadBits(out bits, 15);
Assert.AreEqual(12, b);
Assert.AreEqual(lst.Length, lst.Position);
Assert.AreEqual(lst.LengthBits, lst.PositionBits);
Assert.AreEqual(0x421, bits);
var buf = new byte[3];
b = lst.Read(buf, 0, buf.Length);
Assert.AreEqual(0, b);
Assert.AreEqual(lst.Length, lst.Position);
Assert.AreEqual(lst.LengthBits, lst.PositionBits);
lst.Seek(-3, SeekOrigin.End);
b = lst.Read(buf, 0, buf.Length);
Assert.AreEqual(3, b);
Assert.AreEqual(Encoding.ASCII.GetBytes("ld!"), buf);
Assert.AreEqual(lst.Length, lst.Position);
Assert.AreEqual(lst.LengthBits, lst.PositionBits);
}
