Method sanitizeFilename

app/src/main/java/eu/faircode/email/Helper.java:2901–2909

(String name)

    }

    static String sanitizeFilename(String name) {
        if (name == null)
            return null;

        return name
                // Canonical files names cannot contain NUL
                .replace("\0", "")
                .replaceAll("[?:\"*|/\\\\<>]", "_");
    }

    static String getExtension(String filename) {
        if (filename == null)