public static byte[] Decode(byte[] data, int from, int to, int bitsInterval)
{
var copiedData = new byte[to - from + 1];
Array.Copy(data, from, copiedData, 0, copiedData.Length);
byte[] reverseBytes = Convert.ReverseBitsInBytes(copiedData);
using (var s = new MemoryStream(reverseBytes))
using (var reader = new BitReader(s))
{
using (var decoded = new MemoryStream())
using (var writer = new BitWriter(decoded))
{
int counter = 0;
while (reader.CanRead)
{
byte bit = reader.ReadBits(1);
writer.WriteBit(bit);
counter = (bit == 1) ? counter + 1 : 0;
if (counter == bitsInterval)
{
reader.ReadBits(1); // skip next 0 bit
counter = 0;
}
}
// !! do not flush last bits
return(Convert.ReverseBitsInBytes(decoded.ToArray()));
}
}
}
public static byte[] Encode(byte[] data, int bitsInterval)
{
byte[] reverseBytes = Convert.ReverseBitsInBytes(data);
using (var s = new MemoryStream(reverseBytes))
using (var reader = new BitReader(s))
{
using (var encoded = new MemoryStream())
using (var writer = new BitWriter(encoded))
{
int counter = 0;
while (reader.CanRead)
{
byte bit = reader.ReadBits(1);
writer.WriteBit(bit);
counter = (bit == 1) ? counter + 1 : 0;
if (counter == bitsInterval)
{
writer.WriteBit(0);
counter = 0;
}
}
writer.FlushBits();
return(Convert.ReverseBitsInBytes(encoded.ToArray()));
}
}
}