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use core::str::{Chars, FromStr};
use alloc::fmt::{self, Display, Formatter};
use crate::ByteError;
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
/// The unit of bytes.
pub enum ByteUnit {
/// 1 B = 1 byte
B,
/// 1 KB = 1000 bytes (10<sup>3</sup>)
KB,
/// 1 KiB = 1024 bytes (2<sup>10</sup>)
KiB,
/// 1 MB = 1000000 bytes (10<sup>6</sup>)
MB,
/// 1 MiB = 1048576 bytes (2<sup>20</sup>)
MiB,
/// 1 GB = 1000000000 bytes (10<sup>9</sup>)
GB,
/// 1 GiB = 1073741824 bytes (2<sup>30</sup>)
GiB,
/// 1 TB = 1000000000000 bytes (10<sup>12</sup>)
TB,
/// 1 TiB = 1099511627776 bytes (2<sup>40</sup>)
TiB,
/// 1 PB = 1000000000000000 bytes (10<sup>15</sup>)
PB,
/// 1 PiB = 1125899906842624 bytes (2<sup>50</sup>)
PiB,
#[cfg(feature = "u128")]
/// 1 EB = 1000000000000000000 bytes (10<sup>18</sup>)
EB,
#[cfg(feature = "u128")]
/// 1 EiB = 1152921504606846976 bytes (2<sup>60</sup>)
EiB,
#[cfg(feature = "u128")]
/// 1 ZB = 1000000000000000000000 bytes (10<sup>21</sup>)
ZB,
#[cfg(feature = "u128")]
/// 1 ZiB = 1180591620717411303424 bytes (2<sup>70</sup>)
ZiB,
}
impl ByteUnit {
/// Get an instance of `ByteUnit` from a string slice.
///
/// ```
/// extern crate byte_unit;
///
/// use byte_unit::ByteUnit;
///
/// assert_eq!(ByteUnit::B, ByteUnit::from_str("").unwrap());
/// assert_eq!(ByteUnit::B, ByteUnit::from_str("b").unwrap());
/// assert_eq!(ByteUnit::B, ByteUnit::from_str("B").unwrap());
/// assert_eq!(ByteUnit::KB, ByteUnit::from_str("k").unwrap());
/// assert_eq!(ByteUnit::KB, ByteUnit::from_str("K").unwrap());
/// assert_eq!(ByteUnit::KiB, ByteUnit::from_str("Kib").unwrap());
/// assert_eq!(ByteUnit::MB, ByteUnit::from_str("mb").unwrap());
/// assert_eq!(ByteUnit::MiB, ByteUnit::from_str("mib").unwrap());
/// assert_eq!(ByteUnit::GB, ByteUnit::from_str("GB").unwrap());
/// assert_eq!(ByteUnit::GiB, ByteUnit::from_str("GiB").unwrap());
/// assert_eq!(ByteUnit::TB, ByteUnit::from_str("TB").unwrap());
/// assert_eq!(ByteUnit::TiB, ByteUnit::from_str("TIB").unwrap());
/// assert_eq!(ByteUnit::PB, ByteUnit::from_str("PB").unwrap());
/// assert_eq!(ByteUnit::PiB, ByteUnit::from_str("PiB").unwrap());
/// ```
#[allow(clippy::should_implement_trait)]
pub fn from_str<S: AsRef<str>>(unit: S) -> Result<ByteUnit, ByteError> {
let s = unit.as_ref().trim();
let mut chars = s.chars();
read_xib(chars.next(), chars)
}
/// Use string slice to represent this `ByteUnit`.
///
/// ```
/// extern crate byte_unit;
///
/// use byte_unit::ByteUnit;
///
/// assert_eq!("B", ByteUnit::B.as_str());
/// assert_eq!("KB", ByteUnit::KB.as_str());
/// assert_eq!("KiB", ByteUnit::KiB.as_str());
/// assert_eq!("MB", ByteUnit::MB.as_str());
/// assert_eq!("MiB", ByteUnit::MiB.as_str());
/// assert_eq!("GB", ByteUnit::GB.as_str());
/// assert_eq!("GiB", ByteUnit::GiB.as_str());
/// assert_eq!("TB", ByteUnit::TB.as_str());
/// assert_eq!("TiB", ByteUnit::TiB.as_str());
/// assert_eq!("PB", ByteUnit::PB.as_str());
/// assert_eq!("PiB", ByteUnit::PiB.as_str());
/// ```
#[inline]
pub fn as_str(self) -> &'static str {
match self {
ByteUnit::B => "B",
ByteUnit::KB => "KB",
ByteUnit::KiB => "KiB",
ByteUnit::MB => "MB",
ByteUnit::MiB => "MiB",
ByteUnit::GB => "GB",
ByteUnit::GiB => "GiB",
ByteUnit::TB => "TB",
ByteUnit::TiB => "TiB",
ByteUnit::PB => "PB",
ByteUnit::PiB => "PiB",
#[cfg(feature = "u128")]
ByteUnit::EB => "EB",
#[cfg(feature = "u128")]
ByteUnit::EiB => "EiB",
#[cfg(feature = "u128")]
ByteUnit::ZB => "ZB",
#[cfg(feature = "u128")]
ByteUnit::ZiB => "ZiB",
}
}
/// Get bytes represented by this `ByteUnit`.
///
/// ```
/// extern crate byte_unit;
///
/// use byte_unit::ByteUnit;
///
/// assert_eq!(1000000000000000000000, ByteUnit::ZB.get_unit_bytes());
/// assert_eq!(1152921504606846976, ByteUnit::EiB.get_unit_bytes());
/// ```
#[cfg(feature = "u128")]
#[inline]
pub fn get_unit_bytes(self) -> u128 {
match self {
ByteUnit::B => 1,
ByteUnit::KB => n_kb_bytes!(),
ByteUnit::KiB => n_kib_bytes!(),
ByteUnit::MB => n_mb_bytes!(),
ByteUnit::MiB => n_mib_bytes!(),
ByteUnit::GB => n_gb_bytes!(),
ByteUnit::GiB => n_gib_bytes!(),
ByteUnit::TB => n_tb_bytes!(),
ByteUnit::TiB => n_tib_bytes!(),
ByteUnit::PB => n_pb_bytes!(),
ByteUnit::PiB => n_pib_bytes!(),
ByteUnit::EB => n_eb_bytes!(),
ByteUnit::EiB => n_eib_bytes!(),
ByteUnit::ZB => n_zb_bytes!(),
ByteUnit::ZiB => n_zib_bytes!(),
}
}
/// Get bytes represented by this `ByteUnit`.
///
/// ```
/// extern crate byte_unit;
///
/// use byte_unit::ByteUnit;
///
/// assert_eq!(1024, ByteUnit::KiB.get_unit_bytes());
/// assert_eq!(1000000000, ByteUnit::GB.get_unit_bytes());
/// ```
#[cfg(not(feature = "u128"))]
#[inline]
pub fn get_unit_bytes(self) -> u64 {
match self {
ByteUnit::B => 1,
ByteUnit::KB => n_kb_bytes!(),
ByteUnit::KiB => n_kib_bytes!(),
ByteUnit::MB => n_mb_bytes!(),
ByteUnit::MiB => n_mib_bytes!(),
ByteUnit::GB => n_gb_bytes!(),
ByteUnit::GiB => n_gib_bytes!(),
ByteUnit::TB => n_tb_bytes!(),
ByteUnit::TiB => n_tib_bytes!(),
ByteUnit::PB => n_pb_bytes!(),
ByteUnit::PiB => n_pib_bytes!(),
}
}
}
impl Display for ByteUnit {
#[inline]
fn fmt(&self, f: &mut Formatter) -> Result<(), fmt::Error> {
f.write_str(self.as_str())
}
}
impl AsRef<str> for ByteUnit {
#[inline]
fn as_ref(&self) -> &str {
self.as_str()
}
}
impl FromStr for ByteUnit {
type Err = ByteError;
#[inline]
fn from_str(s: &str) -> Result<Self, Self::Err> {
ByteUnit::from_str(s)
}
}
pub(crate) fn read_xib(c: Option<char>, mut chars: Chars) -> Result<ByteUnit, ByteError> {
match c {
Some(c) => {
match c.to_ascii_uppercase() {
'B' => {
if chars.next().is_some() {
Err(ByteError::UnitIncorrect(format!(
"The character {:?} is incorrect. No character is expected.",
c
)))
} else {
Ok(ByteUnit::B)
}
}
'K' => {
if read_ib(chars)? {
Ok(ByteUnit::KiB)
} else {
Ok(ByteUnit::KB)
}
}
'M' => {
if read_ib(chars)? {
Ok(ByteUnit::MiB)
} else {
Ok(ByteUnit::MB)
}
}
'G' => {
if read_ib(chars)? {
Ok(ByteUnit::GiB)
} else {
Ok(ByteUnit::GB)
}
}
'T' => {
if read_ib(chars)? {
Ok(ByteUnit::TiB)
} else {
Ok(ByteUnit::TB)
}
}
'P' => {
if read_ib(chars)? {
Ok(ByteUnit::PiB)
} else {
Ok(ByteUnit::PB)
}
}
#[cfg(feature = "u128")]
'E' => {
if read_ib(chars)? {
Ok(ByteUnit::EiB)
} else {
Ok(ByteUnit::EB)
}
}
#[cfg(feature = "u128")]
'Z' => {
if read_ib(chars)? {
Ok(ByteUnit::ZiB)
} else {
Ok(ByteUnit::ZB)
}
}
_ => {
#[cfg(feature = "u128")]
{
Err(ByteError::UnitIncorrect(format!("The character {:?} is incorrect. A 'B', a 'K', a 'M', a 'G', a 'T', a 'P', a 'E' or no character is expected.", c)))
}
#[cfg(not(feature = "u128"))]
{
Err(ByteError::UnitIncorrect(format!("The character {:?} is incorrect. A 'B', a 'K', a 'M', a 'G', a 'T', a 'P' or no character is expected.", c)))
}
}
}
}
None => Ok(ByteUnit::B),
}
}
fn read_ib(mut chars: Chars) -> Result<bool, ByteError> {
match chars.next() {
Some(c) => {
match c.to_ascii_uppercase() {
'I' => {
match chars.next() {
Some(c) => {
match c.to_ascii_uppercase() {
'B' => Ok(true),
_ => {
Err(ByteError::UnitIncorrect(format!(
"The character {:?} is incorrect. A 'B' is expected.",
c
)))
}
}
}
None => Ok(true),
}
}
'B' => {
if chars.next().is_some() {
Err(ByteError::UnitIncorrect(format!(
"The character {:?} is incorrect. No character is expected.",
c
)))
} else {
Ok(false)
}
}
_ => {
Err(ByteError::UnitIncorrect(format!(
"The character {:?} is incorrect. A 'B' or an 'i' is expected.",
c
)))
}
}
}
None => Ok(false),
}
}