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Some files in the Old School RuneScape cache contain a hash of their name. The only way to find out the names of these files is to reverse the hashes.

The following hash function is used:

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;
}

It is equivalent to s.toLowerCase(Locale.ROOT).hashCode() for ASCII-only inputs