static void ssl_check_for_safari(SSL *s, const PACKET *pkt)
{
    unsigned int type;
    PACKET sni, tmppkt;
    size_t ext_len;

    static const unsigned char kSafariExtensionsBlock[] = {
        0x00, 0x0a,             /* elliptic_curves extension */
        0x00, 0x08,             /* 8 bytes */
        0x00, 0x06,             /* 6 bytes of curve ids */
        0x00, 0x17,             /* P-256 */
        0x00, 0x18,             /* P-384 */
        0x00, 0x19,             /* P-521 */

        0x00, 0x0b,             /* ec_point_formats */
        0x00, 0x02,             /* 2 bytes */
        0x01,                   /* 1 point format */
        0x00,                   /* uncompressed */
        /* The following is only present in TLS 1.2 */
        0x00, 0x0d,             /* signature_algorithms */
        0x00, 0x0c,             /* 12 bytes */
        0x00, 0x0a,             /* 10 bytes */
        0x05, 0x01,             /* SHA-384/RSA */
        0x04, 0x01,             /* SHA-256/RSA */
        0x02, 0x01,             /* SHA-1/RSA */
        0x04, 0x03,             /* SHA-256/ECDSA */
        0x02, 0x03,             /* SHA-1/ECDSA */
    };

    /* Length of the common prefix (first two extensions). */
    static const size_t kSafariCommonExtensionsLength = 18;

    tmppkt = *pkt;

    if (!PACKET_forward(&tmppkt, 2)
        || !PACKET_get_net_2(&tmppkt, &type)
        || !PACKET_get_length_prefixed_2(&tmppkt, &sni)) {
        return;
    }

    if (type != TLSEXT_TYPE_server_name)
        return;

    ext_len = TLS1_get_client_version(s) >= TLS1_2_VERSION ?
        sizeof(kSafariExtensionsBlock) : kSafariCommonExtensionsLength;

    s->s3->is_probably_safari = PACKET_equal(&tmppkt, kSafariExtensionsBlock,
                                             ext_len);
}

static void ssl_check_for_safari(SSL *s, const PACKET *pkt)
{
    unsigned int type;
    PACKET sni, tmppkt;
    size_t ext_len;

    static const unsigned char kSafariExtensionsBlock[] = {
        0x00, 0x0a,             /* elliptic_curves extension */
        0x00, 0x08,             /* 8 bytes */
        0x00, 0x06,             /* 6 bytes of curve ids */
        0x00, 0x17,             /* P-256 */
        0x00, 0x18,             /* P-384 */
        0x00, 0x19,             /* P-521 */

        0x00, 0x0b,             /* ec_point_formats */
        0x00, 0x02,             /* 2 bytes */
        0x01,                   /* 1 point format */
        0x00,                   /* uncompressed */
        /* The following is only present in TLS 1.2 */
        0x00, 0x0d,             /* signature_algorithms */
        0x00, 0x0c,             /* 12 bytes */
        0x00, 0x0a,             /* 10 bytes */
        0x05, 0x01,             /* SHA-384/RSA */
        0x04, 0x01,             /* SHA-256/RSA */
        0x02, 0x01,             /* SHA-1/RSA */
        0x04, 0x03,             /* SHA-256/ECDSA */
        0x02, 0x03,             /* SHA-1/ECDSA */
    };

    /* Length of the common prefix (first two extensions). */
    static const size_t kSafariCommonExtensionsLength = 18;

    tmppkt = *pkt;

    if (!PACKET_forward(&tmppkt, 2)
        || !PACKET_get_net_2(&tmppkt, &type)
        || !PACKET_get_length_prefixed_2(&tmppkt, &sni)) {
        return;
    }

    if (type != TLSEXT_TYPE_server_name)
        return;

    ext_len = TLS1_get_client_version(s) >= TLS1_2_VERSION ?
        sizeof(kSafariExtensionsBlock) : kSafariCommonExtensionsLength;

    s->s3->is_probably_safari = PACKET_equal(&tmppkt, kSafariExtensionsBlock,
                                             ext_len);
}
