Struct varuint::Varuint

pub struct Varuint(pub u128);

Variable length unsigned integer.

Examples

use std::mem;
 
use varuint::{Varuint, Serializable, Deserializable};
use std::io::Read;
 
 
fn test_varuint(v: u128, size: usize) {
 let v = Varuint(v);
 assert_eq!(size, v.size_hint());
 let mut arr: [u8; 17] = unsafe { mem::uninitialized() };
 {
     let mut buf = &mut arr as &mut [u8];
     assert_eq!(size, v.serialize(&mut buf).unwrap());
 }
 let mut buf: &[u8] = &arr;
 let mut read: &mut Read = &mut buf;
 assert_eq!(v, Varuint::deserialize(read).unwrap());
}
 
test_varuint(0, 1);
test_varuint(240, 1);
 
test_varuint(241, 2);
test_varuint(2031, 2);
 
test_varuint(2032, 3);
test_varuint(67567, 3);
 
test_varuint(67568, 4);
test_varuint(16777215, 4);
 
test_varuint(16777216, 5);
test_varuint(4294967295, 5);
 
test_varuint(4294967296, 6);
test_varuint(1099511627775, 6);
 
test_varuint(1099511627776, 7);
test_varuint(281474976710655, 7);
 
test_varuint(281474976710656, 8);
test_varuint(72057594037927935, 8);
 
test_varuint(72057594037927936, 9);
test_varuint(u64::max_value().into(), 9);

test_varuint(u64::max_value() as u128 + 1, 17);
test_varuint(u128::max_value(), 17);

Methods from Deref<Target = u128>

Trait Implementations

impl Copy for Varuint

impl Clone for Varuint

fn clone(&self) -> Varuint

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl PartialEq for Varuint

fn eq(&self, other: &Varuint) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Varuint) -> bool

This method tests for !=.

impl Eq for Varuint

impl Hash for Varuint

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given [Hasher].

fn hash_slice<H>(data: &[Self], state: &mut H) where     H: Hasher,

Feeds a slice of this type into the given [Hasher].

impl PartialOrd for Varuint

fn partial_cmp(&self, other: &Varuint) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Varuint) -> bool

This method tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Varuint) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Varuint) -> bool

This method tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Varuint) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl Ord for Varuint

fn cmp(&self, other: &Varuint) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

Compares and returns the minimum of two values.

impl Debug for Varuint

fn fmt(&self, f: &mut Formatter) -> Result

Formats the value using the given formatter.

impl Display for Varuint

fn fmt(&self, f: &mut Formatter) -> Result

Formats the value using the given formatter.

impl Deref for Varuint

type Target = u128

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl DerefMut for Varuint

fn deref_mut(&mut self) -> &mut Self::Target

Mutably dereferences the value.

impl From<u8> for Varuint

fn from(v: u8) -> Self

Performs the conversion.

impl From<u16> for Varuint

fn from(v: u16) -> Self

Performs the conversion.

impl From<u32> for Varuint

fn from(v: u32) -> Self

Performs the conversion.

impl From<u64> for Varuint

fn from(v: u64) -> Self

Performs the conversion.

impl From<u128> for Varuint

fn from(v: u128) -> Self

Performs the conversion.

impl Default for Varuint

fn default() -> Self

Returns the "default value" for a type.

impl Deserializable for Varuint

fn deserialize(r: &mut Read) -> Result<Varuint>

Deserialize value from a Read

impl Serializable for Varuint

fn size_hint(&self) -> usize

Get a hint of encoded value byte-length

fn serialize(&self, w: &mut Write) -> Result<usize>

Serialize a value, returns bytes written