assert i <= ((1 << numBits)-1): String.format("Trying to write a value bigger (%s) than the number bits (%s) allows. " +
"Please mask the value before writing it and make your code is really working as intended.", i, (1<<numBits)-1);
int left = 8 - position % 8;
if (numBits <= left) {
int current = (buffer.get(initialPos + position / 8));
current = current < 0 ? current + 256 : current;
current += i << (left - numBits);
buffer.put(initialPos + position / 8, (byte) (current > 127 ? current - 256 : current));
position += numBits;
} else {
int bitsSecondWrite = numBits - left;
writeBits(i >> bitsSecondWrite, left);
writeBits(i & (1 << bitsSecondWrite) - 1, bitsSecondWrite);
}
buffer.position(initialPos + position / 8 + ((position % 8 > 0) ? 1 : 0));