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/*! # Byte Unit A library for interaction with units of bytes. The units are **B** for 1 byte, **KB** for 1000 bytes, **KiB** for 1024 bytes, **MB** for 1000000 bytes, **MiB** for 1048576 bytes, etc, and up to **PiB** which is 1125899906842624 bytes. The data type for storing the size of bytes is `u128`, so don't worry about the overflow problem. ## Usage ### Macros There are `n_*_bytes` macros can be used. The star `*` means the unit. For example, `n_gb_bytes` can be used to get a **n-GB** value in bytes. ```rust #[macro_use] extern crate byte_unit; let result = n_gb_bytes!(4); assert_eq!(4000000000u128, result); ``` You may need to assign a primitive type if the `n` is not an integer. ```rust #[macro_use] extern crate byte_unit; let result = n_gb_bytes!(2.5, f64); assert_eq!(2500000000u128, result); ``` ### Byte The `Byte` structure can be used for representing a size of bytes. The `from_str` associated function can parse any **SIZE** string and return a `Byte` instance in common usage. The format of a **SIZE** string is like "123", "123KiB" or "50.84 MB". ```rust extern crate byte_unit; use byte_unit::Byte; let result = Byte::from_str("50.84 MB").unwrap(); assert_eq!(50840000u128, result.get_bytes()); ``` You can also use the `from_bytes` and `from_unit` associated functions to create a `Byte` instance. ```rust extern crate byte_unit; use byte_unit::Byte; let result = Byte::from_bytes(1500000u128); assert_eq!(1500000u128, result.get_bytes()); ``` ```rust extern crate byte_unit; use byte_unit::{Byte, ByteUnit}; let result = Byte::from_unit(1500f64, ByteUnit::KB).unwrap(); assert_eq!(1500000u128, result.get_bytes()); ``` ### AdjustedByte To change the unit of a `Byte` instance, you can use the `get_adjusted_unit` method. ```rust extern crate byte_unit; use byte_unit::{Byte, ByteUnit}; let byte = Byte::from_str("123KiB").unwrap(); let adjusted_byte = byte.get_adjusted_unit(ByteUnit::KB); assert_eq!("125.95 KB", adjusted_byte.to_string()); ``` To change the unit of a `Byte` instance automatically and appropriately, you can use the `get_appropriate_unit` method. ```rust extern crate byte_unit; use byte_unit::Byte; let byte = Byte::from_bytes(1500000u128); let adjusted_byte = byte.get_appropriate_unit(false); assert_eq!("1.50 MB", adjusted_byte.to_string()); ``` ```rust extern crate byte_unit; use byte_unit::Byte; let byte = Byte::from_bytes(1500000u128); let adjusted_byte = byte.get_appropriate_unit(true); assert_eq!("1.43 MiB", adjusted_byte.to_string()); ``` The number of fractional digits created by the `to_string` method of a `AdjustedByte` instance is always 2. To change the number of fractional digits in the formatted string, you can use the `format` method instead. ```rust extern crate byte_unit; use byte_unit::Byte; let byte = Byte::from_bytes(1500000u128); let adjusted_byte = byte.get_appropriate_unit(false); assert_eq!("1.5 MB", adjusted_byte.format(1)); ``` */ #![no_std] #[macro_use] extern crate alloc; mod byte_unit; mod macros; pub use crate::byte_unit::ByteUnit; use alloc::fmt::{self, Display, Formatter}; use alloc::str::FromStr; use alloc::string::String; #[derive(Debug, PartialEq, Eq)] /// Different error types for `Byte` and `ByteUnit`. pub enum ByteError { ValueIncorrect(String), UnitIncorrect(String), } #[derive(Debug, Clone, Copy, PartialOrd, Ord, PartialEq, Eq)] /// Represent the n-bytes data. Use associated functions: `from_unit`, `from_bytes`, `from_str`, to create the instance. pub struct Byte { bytes: u128, } impl Display for Byte { #[inline] fn fmt(&self, f: &mut Formatter) -> Result<(), fmt::Error> { f.write_fmt(format_args!("{}", self.bytes)) } } impl FromStr for Byte { type Err = ByteError; #[inline] fn from_str(s: &str) -> Result<Self, Self::Err> { Byte::from_str(s) } } impl Byte { /// Create a new `Byte` object from a specified value and a unit. **Accuracy** should be taken care of. /// /// ## Examples /// /// ``` /// extern crate byte_unit; /// /// use byte_unit::{Byte, ByteUnit}; /// /// let result = Byte::from_unit(1500f64, ByteUnit::KB).unwrap(); /// /// assert_eq!(result.get_bytes(), 1500000u128); /// ``` #[inline] pub fn from_unit(value: f64, unit: ByteUnit) -> Result<Byte, ByteError> { if value < 0f64 { return Err(ByteError::ValueIncorrect(format!( "The value `{}` for creating a `Byte` instance is negative.", value ))); } let bytes = get_bytes(value, unit); Ok(Byte { bytes, }) } /// Create a new `Byte` object from bytes. /// /// ## Examples /// /// ``` /// extern crate byte_unit; /// /// use byte_unit::{Byte, ByteUnit}; /// /// let result = Byte::from_bytes(1500000u128); /// /// assert_eq!(result.get_bytes(), 1500000u128); /// ``` #[inline] pub fn from_bytes(bytes: u128) -> Byte { Byte { bytes, } } /// Create a new `Byte` object from string. **Accuracy** should be taken care of. /// /// ## Examples /// /// ``` /// extern crate byte_unit; /// /// use byte_unit::{Byte, ByteUnit}; /// /// let result = Byte::from_str("123KiB").unwrap(); /// /// assert_eq!(result, Byte::from_unit(123f64, ByteUnit::KiB).unwrap()); /// ``` /// /// ``` /// extern crate byte_unit; /// /// use byte_unit::{Byte, ByteUnit}; /// /// let result = Byte::from_str("50.84 MB").unwrap(); /// /// assert_eq!(result, Byte::from_unit(50.84f64, ByteUnit::MB).unwrap()); /// ``` /// /// ``` /// extern crate byte_unit; /// /// use byte_unit::{Byte, ByteUnit}; /// /// let result = Byte::from_str("8 B").unwrap(); // 8 bytes /// /// assert_eq!(result.get_bytes(), 8u128); /// ``` /// /// ``` /// extern crate byte_unit; /// /// use byte_unit::{Byte, ByteUnit}; /// /// let result = Byte::from_str("8").unwrap(); // 8 bytes /// /// assert_eq!(result.get_bytes(), 8u128); /// ``` /// /// ``` /// extern crate byte_unit; /// /// use byte_unit::{Byte, ByteUnit}; /// /// let result = Byte::from_str("8 b").unwrap(); // 8 bytes /// /// assert_eq!(result.get_bytes(), 8u128); /// ``` /// /// ``` /// extern crate byte_unit; /// /// use byte_unit::{Byte, ByteUnit}; /// /// let result = Byte::from_str("8 kb").unwrap(); // 8K bytes /// /// assert_eq!(result.get_bytes(), 8000u128); /// ``` /// /// ``` /// extern crate byte_unit; /// /// use byte_unit::{Byte, ByteUnit}; /// /// let result = Byte::from_str("8 kib").unwrap(); // 8Ki bytes /// /// assert_eq!(result.get_bytes(), 8192u128); /// ``` /// /// ``` /// extern crate byte_unit; /// /// use byte_unit::{Byte, ByteUnit}; /// /// let result = Byte::from_str("8 k").unwrap(); // 8K bytes /// /// assert_eq!(result.get_bytes(), 8000u128); /// ``` #[allow(clippy::should_implement_trait)] pub fn from_str<S: AsRef<str>>(s: S) -> Result<Byte, ByteError> { let s = s.as_ref().trim(); let mut chars = s.chars(); let mut value = match chars.next() { Some(c) => { match c { '0'..='9' => f64::from(c as u8 - b'0'), _ => { return Err(ByteError::ValueIncorrect(format!( "The character {:?} is not a number.", c ))) } } } None => return Err(ByteError::ValueIncorrect(String::from("No value."))), }; let c = 'outer: loop { match chars.next() { Some(c) => { match c { '0'..='9' => { value = value * 10.0 + f64::from(c as u8 - b'0'); } '.' => { let mut i = 0.1; loop { match chars.next() { Some(c) => { if c >= '0' && c <= '9' { value += f64::from(c as u8 - b'0') * i; i /= 10.0; } else { if (i * 10.0) as u8 == 1 { return Err(ByteError::ValueIncorrect(format!( "The character {:?} is not a number.", c ))); } match c { ' ' => { loop { match chars.next() { Some(c) => { match c { ' ' => (), _ => break 'outer Some(c), } } None => break 'outer None, } } } _ => break 'outer Some(c), } } } None => { if (i * 10.0) as u8 == 1 { return Err(ByteError::ValueIncorrect(format!( "The character {:?} is not a number.", c ))); } break 'outer None; } } } } ' ' => { loop { match chars.next() { Some(c) => { match c { ' ' => (), _ => break 'outer Some(c), } } None => break 'outer None, } } } _ => break 'outer Some(c), } } None => break None, } }; let unit = match c { Some(c) => { match c.to_ascii_uppercase() { 'B' => if chars.next().is_some() { return Err(ByteError::UnitIncorrect(format!("The character {:?} is incorrect. No character is expected.", c))); } else { ByteUnit::B } 'K' => match chars.next() { Some(c) => match c.to_ascii_uppercase() { 'I' => match chars.next() { Some(c) => match c.to_ascii_uppercase() { 'B' => ByteUnit::KiB, _ => return Err(ByteError::UnitIncorrect(format!("The character {:?} is incorrect. A 'B' is expected.", c))) } None => ByteUnit::KiB } 'B' => if chars.next().is_some() { return Err(ByteError::UnitIncorrect(format!("The character {:?} is incorrect. No character is expected.", c))); } else { ByteUnit::KB } _ => return Err(ByteError::UnitIncorrect(format!("The character {:?} is incorrect. A 'B' or an 'i' is expected.", c))) } None => ByteUnit::KB } 'M' => match chars.next() { Some(c) => match c.to_ascii_uppercase() { 'I' => match chars.next() { Some(c) => match c.to_ascii_uppercase() { 'B' => ByteUnit::MiB, _ => return Err(ByteError::UnitIncorrect(format!("The character {:?} is incorrect. A 'B' is expected.", c))) } None => ByteUnit::MiB } 'B' => if chars.next().is_some() { return Err(ByteError::UnitIncorrect(format!("The character {:?} is incorrect. No character is expected.", c))); } else { ByteUnit::MB }, _ => return Err(ByteError::UnitIncorrect(format!("The character {:?} is incorrect. A 'B' or an 'i' is expected.", c))) } None => ByteUnit::MB }, 'G' => match chars.next() { Some(c) => match c.to_ascii_uppercase() { 'I' => match chars.next() { Some(c) => match c.to_ascii_uppercase() { 'B' => ByteUnit::GiB, _ => return Err(ByteError::UnitIncorrect(format!("The character {:?} is incorrect. A 'B' is expected.", c))) } None => ByteUnit::GiB } 'B' => if chars.next().is_some() { return Err(ByteError::UnitIncorrect(format!("The character {:?} is incorrect. No character is expected.", c))); } else { ByteUnit::GB }, _ => return Err(ByteError::UnitIncorrect(format!("The character {:?} is incorrect. A 'B' or an 'i' is expected.", c))) } None => ByteUnit::GB }, 'T' => match chars.next() { Some(c) => match c.to_ascii_uppercase() { 'I' => match chars.next() { Some(c) => match c.to_ascii_uppercase() { 'B' => ByteUnit::TiB, _ => return Err(ByteError::UnitIncorrect(format!("The character {:?} is incorrect. A 'B' is expected.", c))) } None => ByteUnit::TiB } 'B' => if chars.next().is_some() { return Err(ByteError::UnitIncorrect(format!("The character {:?} is incorrect. No character is expected.", c))); } else { ByteUnit::TB }, _ => return Err(ByteError::UnitIncorrect(format!("The character {:?} is incorrect. A 'B' or an 'i' is expected.", c))) } None => ByteUnit::TB }, 'P' => match chars.next() { Some(c) => match c.to_ascii_uppercase() { 'I' => match chars.next() { Some(c) => match c.to_ascii_uppercase() { 'B' => ByteUnit::PiB, _ => return Err(ByteError::UnitIncorrect(format!("The character {:?} is incorrect. A 'B' is expected.", c))) } None => ByteUnit::PiB } 'B' => if chars.next().is_some() { return Err(ByteError::UnitIncorrect(format!("The character {:?} is incorrect. No character is expected.", c))); } else { ByteUnit::PB }, _ => return Err(ByteError::UnitIncorrect(format!("The character {:?} is incorrect. A 'B' or an 'i' is expected.", c))) } None => ByteUnit::PB }, _ => return 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 => ByteUnit::B }; let bytes = get_bytes(value, unit); Ok(Byte { bytes, }) } /// Get bytes represented by a `Byte` object. /// /// ## Examples /// /// ``` /// extern crate byte_unit; /// /// use byte_unit::Byte; /// /// let byte = Byte::from_str("123KiB").unwrap(); /// /// let result = byte.get_bytes(); /// /// assert_eq!(result, 125952); /// ``` /// /// ``` /// extern crate byte_unit; /// /// use byte_unit::Byte; /// /// let byte = Byte::from_str("50.84 MB").unwrap(); /// /// let result = byte.get_bytes(); /// /// assert_eq!(result, 50840000); /// ``` #[inline] pub fn get_bytes(&self) -> u128 { self.bytes } /// Find the appropriate unit and value for `Byte` object. **Accuracy** should be taken care of. /// /// ## Examples /// /// ``` /// extern crate byte_unit; /// /// use byte_unit::Byte; /// /// let byte = Byte::from_str("123KiB").unwrap(); /// /// let adjusted_byte = byte.get_appropriate_unit(false); /// /// assert_eq!(adjusted_byte.to_string(), "125.95 KB"); /// ``` /// /// ``` /// extern crate byte_unit; /// /// use byte_unit::Byte; /// /// let byte = Byte::from_str("50.84 MB").unwrap(); /// /// let adjusted_byte = byte.get_appropriate_unit(true); /// /// assert_eq!(adjusted_byte.to_string(), "48.48 MiB"); /// ``` #[allow(clippy::unnecessary_cast)] pub fn get_appropriate_unit(&self, binary_multiples: bool) -> AdjustedByte { let bytes = self.bytes; if binary_multiples { if bytes > n_pib_bytes!() { AdjustedByte { value: bytes as f64 / n_pib_bytes!() as f64, unit: ByteUnit::PiB, } } else if bytes > n_tib_bytes!() { AdjustedByte { value: bytes as f64 / n_tib_bytes!() as f64, unit: ByteUnit::TiB, } } else if bytes > n_gib_bytes!() { AdjustedByte { value: bytes as f64 / n_gib_bytes!() as f64, unit: ByteUnit::GiB, } } else if bytes > n_mib_bytes!() { AdjustedByte { value: bytes as f64 / n_mib_bytes!() as f64, unit: ByteUnit::MiB, } } else if bytes > n_kib_bytes!() { AdjustedByte { value: bytes as f64 / n_kib_bytes!() as f64, unit: ByteUnit::KiB, } } else { AdjustedByte { value: bytes as f64, unit: ByteUnit::B, } } } else if bytes > n_pb_bytes!() { AdjustedByte { value: bytes as f64 / n_pb_bytes!() as f64, unit: ByteUnit::PB, } } else if bytes > n_tb_bytes!() { AdjustedByte { value: bytes as f64 / n_tb_bytes!() as f64, unit: ByteUnit::TB, } } else if bytes > n_gb_bytes!() { AdjustedByte { value: bytes as f64 / n_gb_bytes!() as f64, unit: ByteUnit::GB, } } else if bytes > n_mb_bytes!() { AdjustedByte { value: bytes as f64 / n_mb_bytes!() as f64, unit: ByteUnit::MB, } } else if bytes > n_kb_bytes!() { AdjustedByte { value: bytes as f64 / n_kb_bytes!() as f64, unit: ByteUnit::KB, } } else { AdjustedByte { value: bytes as f64, unit: ByteUnit::B, } } } /// Adjust the unit and value for `Byte` object. **Accuracy** should be taken care of. /// /// ## Examples /// /// ``` /// extern crate byte_unit; /// /// use byte_unit::{Byte, ByteUnit}; /// /// let byte = Byte::from_str("123KiB").unwrap(); /// /// let adjusted_byte = byte.get_adjusted_unit(ByteUnit::KB); /// /// assert_eq!(adjusted_byte.to_string(), "125.95 KB"); /// ``` /// /// ``` /// extern crate byte_unit; /// /// use byte_unit::{Byte, ByteUnit}; /// /// let byte = Byte::from_str("50.84 MB").unwrap(); /// /// let adjusted_byte = byte.get_adjusted_unit(ByteUnit::MiB); /// /// assert_eq!(adjusted_byte.to_string(), "48.48 MiB"); /// ``` #[allow(clippy::unnecessary_cast)] pub fn get_adjusted_unit(&self, unit: ByteUnit) -> AdjustedByte { let bytes = self.bytes; let value = match unit { ByteUnit::B => bytes as f64, ByteUnit::KB => bytes as f64 / n_kb_bytes!() as f64, ByteUnit::KiB => bytes as f64 / n_kib_bytes!() as f64, ByteUnit::MB => bytes as f64 / n_mb_bytes!() as f64, ByteUnit::MiB => bytes as f64 / n_mib_bytes!() as f64, ByteUnit::GB => bytes as f64 / n_gb_bytes!() as f64, ByteUnit::GiB => bytes as f64 / n_gib_bytes!() as f64, ByteUnit::TB => bytes as f64 / n_tb_bytes!() as f64, ByteUnit::TiB => bytes as f64 / n_tib_bytes!() as f64, ByteUnit::PB => bytes as f64 / n_pb_bytes!() as f64, ByteUnit::PiB => bytes as f64 / n_pib_bytes!() as f64, }; AdjustedByte { value, unit, } } } #[derive(Debug, Clone, Copy)] /// Generated from the `get_appropriate_unit` and `get_adjusted_unit` methods of a `Byte` object. pub struct AdjustedByte { value: f64, unit: ByteUnit, } impl PartialEq for AdjustedByte { /// Deal with the logical numeric equivalent. /// /// # Examples /// /// ``` /// extern crate byte_unit; /// /// use byte_unit::{Byte, ByteUnit}; /// /// let byte1 = Byte::from_unit(1024f64, ByteUnit::KiB).unwrap(); /// let byte2 = Byte::from_unit(1024f64, ByteUnit::KiB).unwrap(); /// /// assert_eq!(byte1.get_appropriate_unit(false), byte2.get_appropriate_unit(true)); /// ``` /// /// ``` /// extern crate byte_unit; /// /// use byte_unit::{Byte, ByteUnit}; /// /// let byte1 = Byte::from_unit(1024f64, ByteUnit::KiB).unwrap(); /// let byte2 = Byte::from_unit(1f64, ByteUnit::MiB).unwrap(); /// /// assert_eq!(byte1.get_appropriate_unit(true), byte2.get_appropriate_unit(false)); /// ``` #[inline] fn eq(&self, other: &AdjustedByte) -> bool { if self.value == other.value && self.unit == other.unit { return true; } let self_value = get_bytes(self.value, self.unit); let other_value = get_bytes(other.value, other.unit); self_value == other_value } } impl Eq for AdjustedByte {} impl AdjustedByte { /// Format the `AdjustedByte` object to string. /// /// # Examples /// /// ``` /// extern crate byte_unit; /// /// use byte_unit::{Byte, ByteUnit}; /// /// let byte = Byte::from_unit(1555f64, ByteUnit::KB).unwrap(); /// /// let result = byte.get_appropriate_unit(false).format(3); /// /// assert_eq!(result, "1.555 MB"); /// ``` #[inline] pub fn format(&self, fractional_digits: usize) -> String { format!("{:.*} {}", fractional_digits, self.value, self.unit) } #[inline] pub fn get_value(&self) -> f64 { self.value } #[inline] pub fn get_unit(&self) -> ByteUnit { self.unit } } impl Display for AdjustedByte { fn fmt(&self, f: &mut Formatter) -> Result<(), fmt::Error> { f.write_fmt(format_args!("{:.2} ", self.value))?; Display::fmt(&self.unit, f) } } fn get_bytes(value: f64, unit: ByteUnit) -> u128 { match unit { ByteUnit::B => value as u128, ByteUnit::KB => n_kb_bytes!(value, f64), ByteUnit::KiB => n_kib_bytes!(value, f64), ByteUnit::MB => n_mb_bytes!(value, f64), ByteUnit::MiB => n_mib_bytes!(value, f64), ByteUnit::GB => n_gb_bytes!(value, f64), ByteUnit::GiB => n_gib_bytes!(value, f64), ByteUnit::TB => n_tb_bytes!(value, f64), ByteUnit::TiB => n_gib_bytes!(value, f64), ByteUnit::PB => n_pb_bytes!(value, f64), ByteUnit::PiB => n_pib_bytes!(value, f64), } }