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44 lines
1.2 KiB
44 lines
1.2 KiB
use crate::*;
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/// A streaming kana hash digest.
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///
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/// This type can be used to generate kana mnemonics from any data.
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/// It wraps a type implementing `std::io::Read` and produces a kana mnemonic reading from the stream until its end.
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/// ```
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/// # use khash::Digest;
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/// let input = "Hello world!";
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/// let mnemonic: String = Digest::new(&mut input.as_bytes()).collect(); // Read the bytes from the `input` string and collect the kana mnemonic into a `String`
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/// ```
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pub struct Digest<'a, T>
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where T: Read
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{
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input: &'a mut T,
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}
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impl<'a, T: Read> Digest<'a, T>
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{
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/// Create a new stream digest iterator from the input stream.
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pub fn new(input: &'a mut T) -> Self
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{
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Self{input}
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}
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}
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impl<'a, T: Read> Iterator for Digest<'a, T>
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{
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type Item = String; //TODO: Change this to `char` and keep an internal buffer that we `fmt::write!` the mnemonic digest to instead of `format!`ing it.
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fn next(&mut self) -> Option<Self::Item>
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{
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let mut buffer = [0u8; 2];
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let mut rd =0;
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while rd < 2 {
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match self.input.read(&mut buffer[rd..]) {
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Ok(2) => break,
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Err(_) | Ok(0) => return None,
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Ok(v) => rd+=v,
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}
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}
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Some(format!("{}",mnemonic::Digest::new(&buffer[..])))
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}
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}
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