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57 lines
1.5 KiB
57 lines
1.5 KiB
use std::collections::HashMap;
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use std::fs::File;
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use std::io::{BufRead, BufReader, Error};
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use num_bigint::BigUint;
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use num_traits::identities::Zero;
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/// Compute the weird hash for a string. Same mechanic since DeS.
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#[allow(dead_code)]
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pub fn hash(s: &str) -> u32 {
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let s = s.to_lowercase();
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let mut val = BigUint::zero();
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for c in s.chars() {
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val *= 37u8;
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val += c as u32;
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}
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val.to_u32_digits()[0]
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}
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/// Get the string representation for this hash.
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pub fn hash_as_string(h: u32) -> String {
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format!("{:08X}", h)
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}
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/// Load a namelist file into a map.
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///
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/// Format for the input file should be the following for every line:
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/// CAFECAFE: /chr/whatever.ext
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pub fn load_name_map(path: &str) -> Result<HashMap<String, String>, Error> {
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let mut names = HashMap::new();
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let namefile = File::open(path)?;
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for line_ in BufReader::new(namefile).lines() {
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if let Ok(line) = line_ {
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let (hash, name) = line.split_at(8);
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names.insert(hash.to_string(), name[2..].to_string());
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}
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}
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Ok(names)
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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 test_hash() {
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assert_eq!(hash("/chr/c0000.anibnd.dcx"), 0xF8630FB1);
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assert_eq!(hash("/param/DrawParam/default_DrawParam.parambnd.dcx"), 0xD9209D30);
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}
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#[test]
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fn test_hash_as_string() {
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assert_eq!(hash_as_string(0xCAFECAFE), "CAFECAFE");
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assert_eq!(hash_as_string(0xDECE), "0000DECE");
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}
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}
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