int WPACKET_reserve_bytes(WPACKET *pkt, size_t len, unsigned char **allocbytes)
{
    assert(pkt->subs != NULL && len != 0);
    if (pkt->subs == NULL || len == 0)
        return 0;
    if (pkt->maxsize - pkt->written < len)
        return 0;
    if (pkt->staticbuf == NULL && (pkt->buf->length - pkt->written < len)) {
        size_t newlen;
        size_t reflen;
        reflen = (len > pkt->buf->length) ? len : pkt->buf->length;
        if (reflen > SIZE_MAX / 2) {
            newlen = SIZE_MAX;
        } else {
            newlen = reflen * 2;
            if (newlen < DEFAULT_BUF_SIZE)
                newlen = DEFAULT_BUF_SIZE;
        }
        if (BUF_MEM_grow(pkt->buf, newlen) == 0)
            return 0;
    }
    if (allocbytes != NULL)
        *allocbytes = WPACKET_get_curr(pkt);
    return 1;
}
['int tls_construct_certificate_request(SSL *s, WPACKET *pkt)\n{\n    int al = SSL_AD_INTERNAL_ERROR;\n    if (SSL_IS_TLS13(s)) {\n        if (!WPACKET_put_bytes_u8(pkt, 0)) {\n            SSLerr(SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST,\n                   ERR_R_INTERNAL_ERROR);\n            goto err;\n        }\n        if (!tls_construct_extensions(s, pkt, EXT_TLS1_3_CERTIFICATE_REQUEST,\n                                      NULL, 0, &al)) {\n            SSLerr(SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST,\n                   ERR_R_INTERNAL_ERROR);\n            goto err;\n        }\n        goto done;\n    }\n    if (!WPACKET_start_sub_packet_u8(pkt)\n        || !ssl3_get_req_cert_type(s, pkt) || !WPACKET_close(pkt)) {\n        SSLerr(SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST, ERR_R_INTERNAL_ERROR);\n        goto err;\n    }\n    if (SSL_USE_SIGALGS(s)) {\n        const uint16_t *psigs;\n        size_t nl = tls12_get_psigalgs(s, 1, &psigs);\n        if (!WPACKET_start_sub_packet_u16(pkt)\n                || !WPACKET_set_flags(pkt, WPACKET_FLAGS_NON_ZERO_LENGTH)\n                || !tls12_copy_sigalgs(s, pkt, psigs, nl)\n                || !WPACKET_close(pkt)) {\n            SSLerr(SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST,\n                   ERR_R_INTERNAL_ERROR);\n            goto err;\n        }\n    }\n    if (!construct_ca_names(s, pkt)) {\n        SSLerr(SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST, ERR_R_INTERNAL_ERROR);\n        goto err;\n    }\n done:\n    s->s3->tmp.cert_request = 1;\n    return 1;\n err:\n    ssl3_send_alert(s, SSL3_AL_FATAL, al);\n    return 0;\n}', 'int WPACKET_start_sub_packet_len__(WPACKET *pkt, size_t lenbytes)\n{\n    WPACKET_SUB *sub;\n    unsigned char *lenchars;\n    assert(pkt->subs != NULL);\n    if (pkt->subs == NULL)\n        return 0;\n    sub = OPENSSL_zalloc(sizeof(*sub));\n    if (sub == NULL)\n        return 0;\n    sub->parent = pkt->subs;\n    pkt->subs = sub;\n    sub->pwritten = pkt->written + lenbytes;\n    sub->lenbytes = lenbytes;\n    if (lenbytes == 0) {\n        sub->packet_len = 0;\n        return 1;\n    }\n    if (!WPACKET_allocate_bytes(pkt, lenbytes, &lenchars))\n        return 0;\n    sub->packet_len = lenchars - GETBUF(pkt);\n    return 1;\n}', 'int ssl3_get_req_cert_type(SSL *s, WPACKET *pkt)\n{\n    uint32_t alg_k, alg_a = 0;\n    if (s->cert->ctype)\n        return WPACKET_memcpy(pkt, s->cert->ctype, s->cert->ctype_len);\n    ssl_set_sig_mask(&alg_a, s, SSL_SECOP_SIGALG_MASK);\n    alg_k = s->s3->tmp.new_cipher->algorithm_mkey;\n#ifndef OPENSSL_NO_GOST\n    if (s->version >= TLS1_VERSION && (alg_k & SSL_kGOST))\n            return WPACKET_put_bytes_u8(pkt, TLS_CT_GOST01_SIGN)\n                    && WPACKET_put_bytes_u8(pkt, TLS_CT_GOST12_SIGN)\n                    && WPACKET_put_bytes_u8(pkt, TLS_CT_GOST12_512_SIGN);\n#endif\n    if ((s->version == SSL3_VERSION) && (alg_k & SSL_kDHE)) {\n#ifndef OPENSSL_NO_DH\n# ifndef OPENSSL_NO_RSA\n        if (!WPACKET_put_bytes_u8(pkt, SSL3_CT_RSA_EPHEMERAL_DH))\n            return 0;\n# endif\n# ifndef OPENSSL_NO_DSA\n        if (!WPACKET_put_bytes_u8(pkt, SSL3_CT_DSS_EPHEMERAL_DH))\n            return 0;\n# endif\n#endif\n    }\n#ifndef OPENSSL_NO_RSA\n    if (!(alg_a & SSL_aRSA) && !WPACKET_put_bytes_u8(pkt, SSL3_CT_RSA_SIGN))\n        return 0;\n#endif\n#ifndef OPENSSL_NO_DSA\n    if (!(alg_a & SSL_aDSS) && !WPACKET_put_bytes_u8(pkt, SSL3_CT_DSS_SIGN))\n        return 0;\n#endif\n#ifndef OPENSSL_NO_EC\n    if (s->version >= TLS1_VERSION\n            && !(alg_a & SSL_aECDSA)\n            && !WPACKET_put_bytes_u8(pkt, TLS_CT_ECDSA_SIGN))\n        return 0;\n#endif\n    return 1;\n}', 'int WPACKET_memcpy(WPACKET *pkt, const void *src, size_t len)\n{\n    unsigned char *dest;\n    if (len == 0)\n        return 1;\n    if (!WPACKET_allocate_bytes(pkt, len, &dest))\n        return 0;\n    memcpy(dest, src, len);\n    return 1;\n}', 'int WPACKET_allocate_bytes(WPACKET *pkt, size_t len, unsigned char **allocbytes)\n{\n    if (!WPACKET_reserve_bytes(pkt, len, allocbytes))\n        return 0;\n    pkt->written += len;\n    pkt->curr += len;\n    return 1;\n}', 'int WPACKET_reserve_bytes(WPACKET *pkt, size_t len, unsigned char **allocbytes)\n{\n    assert(pkt->subs != NULL && len != 0);\n    if (pkt->subs == NULL || len == 0)\n        return 0;\n    if (pkt->maxsize - pkt->written < len)\n        return 0;\n    if (pkt->staticbuf == NULL && (pkt->buf->length - pkt->written < len)) {\n        size_t newlen;\n        size_t reflen;\n        reflen = (len > pkt->buf->length) ? len : pkt->buf->length;\n        if (reflen > SIZE_MAX / 2) {\n            newlen = SIZE_MAX;\n        } else {\n            newlen = reflen * 2;\n            if (newlen < DEFAULT_BUF_SIZE)\n                newlen = DEFAULT_BUF_SIZE;\n        }\n        if (BUF_MEM_grow(pkt->buf, newlen) == 0)\n            return 0;\n    }\n    if (allocbytes != NULL)\n        *allocbytes = WPACKET_get_curr(pkt);\n    return 1;\n}']