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,\n                                      SSL_EXT_TLS1_3_CERTIFICATE_REQUEST, NULL,\n                                      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_put_bytes__(WPACKET *pkt, unsigned int val, size_t size)\n{\n    unsigned char *data;\n    assert(size <= sizeof(unsigned int));\n    if (size > sizeof(unsigned int)\n            || !WPACKET_allocate_bytes(pkt, size, &data)\n            || !put_value(data, val, size))\n        return 0;\n    return 1;\n}', 'int tls_construct_extensions(SSL *s, WPACKET *pkt, unsigned int context,\n                             X509 *x, size_t chainidx, int *al)\n{\n    size_t i;\n    int min_version, max_version = 0, reason, tmpal;\n    const EXTENSION_DEFINITION *thisexd;\n    tmpal = SSL_AD_INTERNAL_ERROR;\n    if (!WPACKET_start_sub_packet_u16(pkt)\n            || ((context &\n                 (SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO)) != 0\n                && s->version == SSL3_VERSION\n                && !WPACKET_set_flags(pkt,\n                                     WPACKET_FLAGS_ABANDON_ON_ZERO_LENGTH))) {\n        SSLerr(SSL_F_TLS_CONSTRUCT_EXTENSIONS, ERR_R_INTERNAL_ERROR);\n        goto err;\n    }\n    if ((context & SSL_EXT_CLIENT_HELLO) != 0) {\n        reason = ssl_get_client_min_max_version(s, &min_version, &max_version);\n        if (reason != 0) {\n            SSLerr(SSL_F_TLS_CONSTRUCT_EXTENSIONS, reason);\n            goto err;\n        }\n    }\n    if ((context & SSL_EXT_CLIENT_HELLO) != 0) {\n        custom_ext_init(&s->cert->custext);\n    }\n    if (!custom_ext_add(s, context, pkt, x, chainidx, max_version, &tmpal)) {\n        SSLerr(SSL_F_TLS_CONSTRUCT_EXTENSIONS, ERR_R_INTERNAL_ERROR);\n        goto err;\n    }\n    for (i = 0, thisexd = ext_defs; i < OSSL_NELEM(ext_defs); i++, thisexd++) {\n        int (*construct)(SSL *s, WPACKET *pkt, unsigned int context, X509 *x,\n                         size_t chainidx, int *al);\n        if (!should_add_extension(s, thisexd->context, context, max_version))\n            continue;\n        construct = s->server ? thisexd->construct_stoc\n                              : thisexd->construct_ctos;\n        if (construct == NULL)\n            continue;\n        if (!construct(s, pkt, context, x, chainidx, &tmpal))\n            goto err;\n    }\n    if (!WPACKET_close(pkt)) {\n        SSLerr(SSL_F_TLS_CONSTRUCT_EXTENSIONS, ERR_R_INTERNAL_ERROR);\n        goto err;\n    }\n    return 1;\n err:\n    *al = tmpal;\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 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}']