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extern crate num_traits; use num_traits::ToPrimitive; use std::fmt; use Unit::*; #[cfg(test)] mod tests; const DEFAULT_BASE: Base = Base::Base2; const DEFAULT_STYLE: Style = Style::Smart; pub const BYTE: usize = 1; pub const KILOBYTE: usize = 1000; pub const MEGABYTE: usize = 1000 * KILOBYTE; pub const GIGABYTE: usize = 1000 * MEGABYTE; pub const TERABYTE: usize = 1000 * MEGABYTE; pub const PETABYTE: usize = 1000 * TERABYTE; pub const EXABYTE: usize = 1000 * PETABYTE; pub const B: usize = BYTE; pub const KB: usize = KILOBYTE; pub const MB: usize = MEGABYTE; pub const GB: usize = GIGABYTE; pub const TB: usize = TERABYTE; pub const PB: usize = PETABYTE; pub const EB: usize = EXABYTE; pub const KIBIBYTE: usize = 1 << 10; pub const MEBIBYTE: usize = 1 << 20; pub const GIBIBYTE: usize = 1 << 30; pub const TEBIBYTE: usize = 1 << 40; pub const PEBIBYTE: usize = 1 << 50; pub const EXBIBYTE: usize = 1 << 60; #[allow(non_upper_case_globals)] pub const KiB: usize = KIBIBYTE; #[allow(non_upper_case_globals)] pub const MiB: usize = MEBIBYTE; #[allow(non_upper_case_globals)] pub const GiB: usize = GIBIBYTE; #[allow(non_upper_case_globals)] pub const TiB: usize = TEBIBYTE; #[allow(non_upper_case_globals)] pub const PiB: usize = PEBIBYTE; #[allow(non_upper_case_globals)] pub const EiB: usize = EXBIBYTE; pub enum Base { Base2, Base10, } pub enum Unit { Byte, Kibibyte, Kilobyte, Mebibyte, Megabyte, Gibibyte, Gigabyte, Tebibyte, Terabyte, Pebibyte, Petabyte, Exbibyte, Exabyte, } impl Unit { fn text(&self) -> (&'static str, &'static str, &'static str, &'static str) { match &self { &Byte => ("byte", "Byte", "b", "B"), &Kilobyte => ("kilobyte", "Kilobyte", "kb", "KB"), &Megabyte => ("megabyte", "Megabyte", "mb", "MB"), &Gigabyte => ("gigabyte", "Gigabyte", "gb", "GB"), &Terabyte => ("terabyte", "Terabyte", "tb", "TB"), &Petabyte => ("petabyte", "Petabyte", "pb", "PB"), &Exabyte => ("exabyte", "Exabyte", "eb", "EB"), &Kibibyte => ("kibibyte", "Kibibyte", "kib", "KiB",), &Mebibyte => ("mebibyte", "Mebibyte", "mib", "MiB",), &Gibibyte => ("gibibyte", "Gibibyte", "gib", "GiB",), &Pebibyte => ("pebibyte", "Pebibyte", "pib", "PiB",), &Tebibyte => ("tebibyte", "Tebibyte", "tib", "TiB",), &Exbibyte => ("exbibyte", "Exbibyte", "eib", "EiB",), } } fn format(&self, mut fmt: &mut fmt::Formatter, bytes: usize, style: &Style) -> fmt::Result { match style { Style::Smart => match &self { &Unit::Byte => self.format(&mut fmt, bytes, &Style::FullLowerCase), _ => self.format(&mut fmt, bytes, &Style::Abbreviated), }, style @ _ => match bytes { 1 => match style { Style::Smart => panic!("already covered above"), Style::FullLowerCase => write!(fmt, " {}", self.text().0), Style::Full => write!(fmt, " {}", self.text().1), Style::AbbreviatedLowerCase => write!(fmt, " {}", self.text().2), Style::Abbreviated => write!(fmt, " {}", self.text().3), }, _ => match style { Style::Smart => panic!("already covered above"), Style::FullLowerCase => write!(fmt, " {}s", self.text().0), Style::Full => write!(fmt, " {}s", self.text().1), Style::AbbreviatedLowerCase => write!(fmt, " {}", self.text().2), Style::Abbreviated => write!(fmt, " {}", self.text().3), }, }, } } } pub enum Size<T: ToPrimitive> { Bytes(T), Kibibytes(T), Kilobytes(T), Mebibytes(T), Megabytes(T), Gibibytes(T), Gigabytes(T), Tebibytes(T), Terabytes(T), Pebibytes(T), Petabytes(T), Exbibytes(T), Exabytes(T), } pub enum Style { Abbreviated, AbbreviatedLowerCase, Full, Smart, FullLowerCase, } impl<T> std::fmt::Display for Size<T> where T: ToPrimitive, { fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result { self.format(fmt, &DEFAULT_BASE, &DEFAULT_STYLE) } } struct Fmt<F>(pub F) where F: Fn(&mut fmt::Formatter) -> fmt::Result; impl<F> fmt::Debug for Fmt<F> where F: Fn(&mut fmt::Formatter) -> fmt::Result { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { (self.0)(f) } } impl<T> Size<T> where T: ToPrimitive, { pub fn bytes(&self) -> usize { use Size::*; match &self { &Bytes(x) => x.to_f64().unwrap(), &Kilobytes(x) => x.to_f64().unwrap() * KILOBYTE as f64, &Megabytes(x) => x.to_f64().unwrap() * MEGABYTE as f64, &Gigabytes(x) => x.to_f64().unwrap() * GIGABYTE as f64, &Terabytes(x) => x.to_f64().unwrap() * TERABYTE as f64, &Petabytes(x) => x.to_f64().unwrap() * PETABYTE as f64, &Exabytes(x) => x.to_f64().unwrap() * EXABYTE as f64, &Kibibytes(x) => x.to_f64().unwrap() * KIBIBYTE as f64, &Mebibytes(x) => x.to_f64().unwrap() * MEBIBYTE as f64, &Gibibytes(x) => x.to_f64().unwrap() * GIBIBYTE as f64, &Tebibytes(x) => x.to_f64().unwrap() * TEBIBYTE as f64, &Pebibytes(x) => x.to_f64().unwrap() * PEBIBYTE as f64, &Exbibytes(x) => x.to_f64().unwrap() * EXBIBYTE as f64, }.to_usize() .unwrap() } pub fn to_string(&self, base: Base, style: Style) -> String { return format!("{:?}", Fmt(|f| self.format(f, &base, &style))); } fn format(&self, mut fmt: &mut fmt::Formatter, base: &Base, style: &Style) -> fmt::Result { let bytes = self.bytes(); let rule = match base { Base::Base2 => match BASE2_RULES.binary_search_by_key(&bytes, |rule| rule.less_than) { Ok(index) => &BASE2_RULES[index + 1], Err(index) => &BASE2_RULES[index], }, Base::Base10 => { match BASE10_RULES.binary_search_by_key(&bytes, |rule| rule.less_than) { Ok(index) => &BASE10_RULES[index + 1], Err(index) => &BASE10_RULES[index], } } }; (rule.formatter)(&mut fmt, bytes)?; rule.unit.format(&mut fmt, bytes, &style)?; return Ok(()); } } struct FormatRule { less_than: usize, formatter: fn(&mut fmt::Formatter, bytes: usize) -> fmt::Result, unit: Unit, } const BASE10_RULES: [FormatRule; 20] = [ FormatRule { less_than: 0, formatter: |_, _| panic!("usize less than zero!"), unit: Byte, }, FormatRule { less_than: 1 * KILOBYTE, formatter: |fmt, bytes| write!(fmt, "{:.0}", bytes), unit: Byte, }, FormatRule { less_than: 10 * KILOBYTE, formatter: |fmt, bytes| write!(fmt, "{:.2}", bytes as f64 / ((1usize * KILOBYTE) as f64)), unit: Kilobyte, }, FormatRule { less_than: 100 * KILOBYTE, formatter: |fmt, bytes| write!(fmt, "{:.1}", bytes as f64 / ((1usize * KILOBYTE) as f64)), unit: Kilobyte, }, FormatRule { less_than: 1 * MEGABYTE, formatter: |fmt, bytes| write!(fmt, "{:.0}", bytes as f64 / ((1usize * KILOBYTE) as f64)), unit: Kilobyte, }, FormatRule { less_than: 10 * MEGABYTE, formatter: |fmt, bytes| write!(fmt, "{:.2}", bytes as f64 / ((1usize * MEGABYTE) as f64)), unit: Megabyte, }, FormatRule { less_than: 100 * MEGABYTE, formatter: |fmt, bytes| write!(fmt, "{:.1}", bytes as f64 / ((1usize * MEGABYTE) as f64)), unit: Megabyte, }, FormatRule { less_than: 1 * GIGABYTE, formatter: |fmt, bytes| write!(fmt, "{:.0}", bytes as f64 / ((1usize * MEGABYTE) as f64)), unit: Megabyte, }, FormatRule { less_than: 10 * GIGABYTE, formatter: |fmt, bytes| write!(fmt, "{:.2}", bytes as f64 / ((1usize * GIGABYTE) as f64)), unit: Gigabyte, }, FormatRule { less_than: 100 * GIGABYTE, formatter: |fmt, bytes| write!(fmt, "{:.1}", bytes as f64 / ((1usize * GIGABYTE) as f64)), unit: Gigabyte, }, FormatRule { less_than: 1 * TERABYTE, formatter: |fmt, bytes| write!(fmt, "{:.0}", bytes as f64 / ((1usize * GIGABYTE) as f64)), unit: Gigabyte, }, FormatRule { less_than: 10 * TERABYTE, formatter: |fmt, bytes| write!(fmt, "{:.2}", bytes as f64 / ((1usize * TERABYTE) as f64)), unit: Terabyte, }, FormatRule { less_than: 100 * TERABYTE, formatter: |fmt, bytes| write!(fmt, "{:.1}", bytes as f64 / ((1usize * TERABYTE) as f64)), unit: Terabyte, }, FormatRule { less_than: 1 * PETABYTE, formatter: |fmt, bytes| write!(fmt, "{:.0}", bytes as f64 / ((1usize * TERABYTE) as f64)), unit: Terabyte, }, FormatRule { less_than: 10 * PETABYTE, formatter: |fmt, bytes| write!(fmt, "{:.2}", bytes as f64 / ((1usize * PETABYTE) as f64)), unit: Petabyte, }, FormatRule { less_than: 100 * PETABYTE, formatter: |fmt, bytes| write!(fmt, "{:.1}", bytes as f64 / ((1usize * PETABYTE) as f64)), unit: Petabyte, }, FormatRule { less_than: 1 * EXABYTE, formatter: |fmt, bytes| write!(fmt, "{:.0}", bytes as f64 / ((1usize * PETABYTE) as f64)), unit: Petabyte, }, FormatRule { less_than: 10 * EXABYTE, formatter: |fmt, bytes| write!(fmt, "{:.2}", bytes as f64 / ((1usize * EXABYTE) as f64)), unit: Exabyte, }, FormatRule { less_than: 100 * EXABYTE, formatter: |fmt, bytes| write!(fmt, "{:.1}", bytes as f64 / ((1usize * EXABYTE) as f64)), unit: Exabyte, }, FormatRule { less_than: usize::max_value(), formatter: |fmt, bytes| write!(fmt, "{:0}", bytes as f64 / ((1usize * EXABYTE) as f64)), unit: Exabyte, }, ]; const BASE2_RULES: [FormatRule; 19] = [ FormatRule { less_than: 0, formatter: |_, _| panic!("usize less than zero!"), unit: Byte, }, FormatRule { less_than: 1 * KIBIBYTE, formatter: |fmt, bytes| write!(fmt, "{:.0}", bytes), unit: Byte, }, FormatRule { less_than: 10 * KIBIBYTE, formatter: |fmt, bytes| write!(fmt, "{:.2}", bytes as f64 / ((1usize * KIBIBYTE) as f64)), unit: Kibibyte, }, FormatRule { less_than: 100 * KIBIBYTE, formatter: |fmt, bytes| write!(fmt, "{:.1}", bytes as f64 / ((1usize * KIBIBYTE) as f64)), unit: Kibibyte, }, FormatRule { less_than: 1 * MEBIBYTE, formatter: |fmt, bytes| write!(fmt, "{:.0}", bytes as f64 / ((1usize * KIBIBYTE) as f64)), unit: Kibibyte, }, FormatRule { less_than: 10 * MEBIBYTE, formatter: |fmt, bytes| write!(fmt, "{:.2}", bytes as f64 / ((1usize * MEBIBYTE) as f64)), unit: Mebibyte, }, FormatRule { less_than: 100 * MEBIBYTE, formatter: |fmt, bytes| write!(fmt, "{:.1}", bytes as f64 / ((1usize * MEBIBYTE) as f64)), unit: Mebibyte, }, FormatRule { less_than: 1 * GIBIBYTE, formatter: |fmt, bytes| write!(fmt, "{:.0}", bytes as f64 / ((1usize * MEBIBYTE) as f64)), unit: Mebibyte, }, FormatRule { less_than: 10 * GIBIBYTE, formatter: |fmt, bytes| write!(fmt, "{:.2}", bytes as f64 / ((1usize * GIBIBYTE) as f64)), unit: Gibibyte, }, FormatRule { less_than: 100 * GIBIBYTE, formatter: |fmt, bytes| write!(fmt, "{:.1}", bytes as f64 / ((1usize * GIBIBYTE) as f64)), unit: Gibibyte, }, FormatRule { less_than: 1 * TEBIBYTE, formatter: |fmt, bytes| write!(fmt, "{:.0}", bytes as f64 / ((1usize * GIBIBYTE) as f64)), unit: Gibibyte, }, FormatRule { less_than: 10 * TEBIBYTE, formatter: |fmt, bytes| write!(fmt, "{:.2}", bytes as f64 / ((1usize * TEBIBYTE) as f64)), unit: Tebibyte, }, FormatRule { less_than: 100 * TEBIBYTE, formatter: |fmt, bytes| write!(fmt, "{:.1}", bytes as f64 / ((1usize * TEBIBYTE) as f64)), unit: Tebibyte, }, FormatRule { less_than: 1 * PEBIBYTE, formatter: |fmt, bytes| write!(fmt, "{:.0}", bytes as f64 / ((1usize * TEBIBYTE) as f64)), unit: Tebibyte, }, FormatRule { less_than: 10 * PEBIBYTE, formatter: |fmt, bytes| write!(fmt, "{:.2}", bytes as f64 / ((1usize * PEBIBYTE) as f64)), unit: Pebibyte, }, FormatRule { less_than: 100 * PEBIBYTE, formatter: |fmt, bytes| write!(fmt, "{:.1}", bytes as f64 / ((1usize * PEBIBYTE) as f64)), unit: Pebibyte, }, FormatRule { less_than: 1 * EXBIBYTE, formatter: |fmt, bytes| write!(fmt, "{:.0}", bytes as f64 / ((1usize * PEBIBYTE) as f64)), unit: Pebibyte, }, FormatRule { less_than: 10 * EXBIBYTE, formatter: |fmt, bytes| write!(fmt, "{:.2}", bytes as f64 / ((1usize * EXBIBYTE) as f64)), unit: Exbibyte, }, FormatRule { less_than: usize::max_value(), formatter: |fmt, bytes| write!(fmt, "{:0}", bytes as f64 / ((1usize * EXBIBYTE) as f64)), unit: Exbibyte, }, ];