### Java Hash Function for OSRS Cache Names

Source: https://github.com/runestar/cache-names/blob/master/README.md

This Java function calculates a hash for strings, specifically used for Old School RuneScape cache file names. It converts the string to lowercase, then to bytes using 'windows-1252' encoding, and applies a polynomial rolling hash. It is equivalent to `s.toLowerCase(Locale.ROOT).hashCode()` for ASCII-only inputs.

```java
public static int hash(String s) {
    byte[] bytes = s.toLowerCase(Locale.ROOT).getBytes(Charset.forName("windows-1252"));
    int h = 0;
    for (byte b : bytes) {
        h = h * 31 + b;
    }
    return h;
}
```

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