mirror of https://github.com/emojisum/emojisum.git
100 lines
2.6 KiB
Rust
100 lines
2.6 KiB
Rust
// Copyright 2018 Stichting Organism
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//! Emojisum
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//External Crates
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extern crate blake2_rfc;
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extern crate serde;
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extern crate serde_json;
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#[macro_use] extern crate serde_derive;
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//Imports
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use std::fs::File;
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use std::path::Path;
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use blake2_rfc::blake2b::{blake2b};
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//Holds main info parsed from standard
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#[derive(Deserialize, Debug)]
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pub struct Emojisum {
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version: String,
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description: String,
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// these are an ordered list, referened by a byte (each byte of a checksum digest)
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emojiwords: Vec<Vec<String>>
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}
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// Words are a set of options to represent an emoji.
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// Possible options could be the ":colon_notation:" or a "U+26CF" style codepoint.
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//pub type Word = String;
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impl Emojisum {
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//Pass a emojimapping JSON to start
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pub fn init(file_path: &str) -> Emojisum {
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let json_file_path = Path::new(file_path);
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let json_file = File::open(json_file_path).expect("file not found");
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let deserialized: Emojisum =
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serde_json::from_reader(json_file).expect("error while reading json");
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return deserialized;
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}
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//given a series of bytes match emojis
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pub fn from_bytes(&self, tosum: &[u8]) -> Option<String> {
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//check that it is 32bytes
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if tosum.len() < 32 { return None }
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let mut result = String::new();
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for byte in tosum {
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result.push_str(&(self.emojiwords[*byte as usize])[0])
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}
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return Some(result);
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}
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//given a vector of bytes, we hash and return checksum
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pub fn hash_to_emojisum(&self, data: Vec<u8>) -> Option<String> {
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//get 256bit hash of given data
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let hash = blake2b(32, &[], &data);
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return self.from_bytes(hash.as_bytes())
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn it_works() {
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let e = Emojisum::init("./src/emojimap.json");
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//println!("{:?}", e);
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println!("{:?}", e.hash_to_emojisum("dog".as_bytes().to_vec()));
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println!("{:?}", e.hash_to_emojisum("cat".as_bytes().to_vec()));
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assert_eq!(2 + 2, 4);
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}
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}
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