public static int computeRawVarint64Size(final long value)
    {
        if ((value & (0xffffffffffffffffL << 7)) == 0)
            return 1;
        if ((value & (0xffffffffffffffffL << 14)) == 0)
            return 2;
        if ((value & (0xffffffffffffffffL << 21)) == 0)
            return 3;
        if ((value & (0xffffffffffffffffL << 28)) == 0)
            return 4;
        if ((value & (0xffffffffffffffffL << 35)) == 0)
            return 5;
        if ((value & (0xffffffffffffffffL << 42)) == 0)
            return 6;
        if ((value & (0xffffffffffffffffL << 49)) == 0)
            return 7;
        if ((value & (0xffffffffffffffffL << 56)) == 0)
            return 8;
        if ((value & (0xffffffffffffffffL << 63)) == 0)
            return 9;
        return 10;
    }
Compute the number of bytes that would be needed to encode a varint.
protostuff-core/src/main/java/io/protostuff/ProtobufOutput.java