private static void AddBytes(ref List <byte> result, int count, byte val)
{
if (count == 1)
{
BitWise.SetBit(ref val, 7);
result.Add(val);
}
else
{
result.Add(val);
if (count <= 0x7F)
{
//Always keep first bit as 0
result.Add((byte)count);
}
else
{
if (count > 0x7FFF)
{
throw new ArithmeticException("Длина не может превышать 32767");
}
byte[] _bytes = BitConverter.GetBytes((UInt16)count);
BitWise.SetBit(ref _bytes[1], 7);
result.Add(_bytes[1]);
result.Add(_bytes[0]);
}
}
}
private static byte CreateByte(List <bool> controlBits, int index)
{
byte b = 0;
for (int i = 0; i < 7; i++)
{
if (index * 7 + i < controlBits.Count)
{
BitWise.SSetBit(ref b, i, controlBits[index * 7 + i] ? 1 : 0);
}
}
return(b);
}
public static void Decode(List <byte> bytes, int offset, int count,
Action <bool> bitProceed)
{
for (int i = 0; i < count;)
{
byte leadB = bytes[offset + i];
if (BitWise.Bit(leadB, 7) == 1)
{
for (int b = 0; b < 7; b++)
{
bitProceed(BitWise.Bit(leadB, b) == 1);
}
i++;
}
else
{
byte indexLB = bytes[offset + i + 1];
if (BitWise.Bit(indexLB, 7) == 0)
{
for (int cnt = 0; cnt < indexLB; cnt++)
{
for (int b = 0; b < 7; b++)
{
bitProceed(BitWise.Bit(leadB, b) == 1);
}
}
i += 2;
}
else
{
byte indexHB = bytes[offset + i + 2];
BitWise.ClearBit(ref indexLB, 7);
var l = BitConverter.ToUInt16(new byte[] { indexLB, indexHB }, 0);
for (int cnt = 0; cnt < l; cnt++)
{
for (int b = 0; b < 7; b++)
{
bitProceed(BitWise.Bit(leadB, b) == 1);
}
}
i += 3;
}
}
}
}
public List <byte> ToBytes()
{
List <byte> result = new List <byte>();
result.AddRange(BitConverter.GetBytes(Offset));
var len = Length;
if (EncodeSymbol)
{
BitWise.SetBit(ref len, 15);
}
else
{
BitWise.ClearBit(ref len, 15);
}
result.AddRange(BitConverter.GetBytes(len));
return(result);
}
public static List <byte> Encode(List <byte> bytes, int offset, int count)
{
List <byte> result = new List <byte>();
List <bool> controlBits = new List <bool>();
for (int i = 0; i < count; i++)
{
for (int b = 0; b < 8; b++)
{
controlBits.Add(BitWise.Bit(bytes[i + offset], b) == 1);
}
}
var newByteCount = (int)Math.Ceiling(controlBits.Count / 7f);
List <byte> controlBytes = Program.CreateSequence(p => CreateByte(controlBits, p),
newByteCount).ToList();
byte last = controlBytes[0];
int cnt = 0;
for (int i = 0; i < newByteCount; i++)
{
if (last == controlBytes[i])
{
cnt++;
}
else
{
AddBytes(ref result, cnt, last);
last = controlBytes[i];
cnt = 1;
}
}
AddBytes(ref result, cnt, last);
return(result);
}
