in hpack/src/main/java/com/twitter/hpack/HuffmanEncoder.java [98:107]
public int getEncodedLength(byte[] data) {
if (data == null) {
throw new NullPointerException("data");
}
long len = 0;
for (byte b : data) {
len += lengths[b & 0xFF];
}
return (int)((len + 7) >> 3);
}