module WebSocket::Mask

Public Class Methods

mask(p1, p2) click to toggle source
VALUE method_websocket_mask(VALUE self, VALUE payload, VALUE mask)
{
    char *payload_s, *mask_s, *unmasked_s;
    long i, n;
    VALUE unmasked;

    if (mask == Qnil || RSTRING_LEN(mask) != 4) {
        return payload;
    }

    payload_s = RSTRING_PTR(payload);
    mask_s    = RSTRING_PTR(mask);
    n         = RSTRING_LEN(payload);

    unmasked   = rb_str_new(0, n);
    unmasked_s = RSTRING_PTR(unmasked);

    for (i = 0; i < n; i++) {
        unmasked_s[i] = payload_s[i] ^ mask_s[i % 4];
    }
    return unmasked;
}