private Inspector find_field(int pos, int len, int sym) {
        for (int i = 0; i < len; ++i) {
            int idx = byte_offset(pos + i);
            if (peek_cmpr_int(idx - (ext_bits(pos + i) + 1)) == sym) {
                return new BinaryView(data, names, index, pos + i);
            }
        }
        return NixValue.invalid();
    }
A read-only view of a Slime value that is stored in binary format.
vespajlib/src/main/java/com/yahoo/slime/BinaryView.java