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67 lines
1.4 KiB
67 lines
1.4 KiB
use crate::*;
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#[derive(Debug,Clone,PartialEq,Eq,Hash)]
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pub struct Digest(Option<char>, Option<char>);
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impl Default for Digest
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{
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fn default() -> Self
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{
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Self(None,None)
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}
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}
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impl Digest {
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/// Create new single 2-byte digest.
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pub fn new(from: &[u8]) -> Self
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{
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let mut d = Self::default();
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if from.len() == 0 {
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return d;
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}
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let sign0 = from[0] & 0x80 != 0;//unsafe { *reinterpret::value::<i8>(from) < 0 };
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let range = &map::KANA_SIGN[sign0 as usize];
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let kana = &map::KANA[range.clone()];
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let oneesan = usize::from(from[0]) % kana.len();
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let xor = if from.len() > 1 {
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from[0] ^ from[1]
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} else {
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from[0]
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} as u32;
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d.0 = Some(match map::KANA_SWAP[range.start()+oneesan] {
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Some(swap) if xor & 2 == 0 => swap,
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Some(_) if xor & 8 == 0 && map::KANA_SWAP2[range.start() + oneesan].is_some() => map::KANA_SWAP2[range.start()+oneesan].unwrap(),
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_ => kana[oneesan],
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});
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if from.len() > 1 {
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if let Some(imoutos) = map::sub(range.start()+oneesan) {
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if let Some(imouto) = imoutos[usize::from(from[1]) % map::KANA_SUB.len()]
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{
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d.1 = Some(imouto);
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return d;
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}
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}
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d.1 = Self::new(&from[1..]).0;
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}
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d
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}
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}
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use std::fmt;
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impl fmt::Display for Digest
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{
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result
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{
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if let Some(oneesan) = self.0 {
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write!(f, "{}", oneesan)?;
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}
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if let Some(imouto) = self.1 {
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write!(f, "{}", imouto)?;
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}
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Ok(())
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}
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}
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