public static CodePoint Decode(byte[] buffer, Index index)
{
var i = index.index;
uint x = buffer[i];
uint code = 0;
switch (index.byteCount)
{
case 1:
return new CodePoint(x);
case 2:
code = x & 0b1_1111;
code = (code << 6) | (uint)(buffer[++i] & 0b0011_1111);
return new CodePoint(code);
case 3:
code = x & 0b1111;
code = (code << 6) | (uint)(buffer[++i] & 0b0011_1111);
code = (code << 6) | (uint)(buffer[++i] & 0b0011_1111);
return new CodePoint(code);
case 4:
code = x & 0b0111;
code = (code << 6) | (uint)(buffer[++i] & 0b0011_1111);
code = (code << 6) | (uint)(buffer[++i] & 0b0011_1111);
code = (code << 6) | (uint)(buffer[++i] & 0b0011_1111);
return new CodePoint(code);
default:
throw new IndexOutOfRangeException();
}
}