/*

 * Copyright 2024 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the Apache License 2.0 (the "License").  You may not use

 * this file except in compliance with the License.  You can obtain a copy

 * in the file LICENSE in the source distribution or at

 * https://www.openssl.org/source/license.html

 */

#include <openssl/crypto.h>

#include <openssl/comp.h>

#include <openssl/obj_mac.h>

#include "internal/cryptlib.h"

#include "internal/comp.h"

#define SSL_COMP_NULL_IDX       0

#define SSL_COMP_ZLIB_IDX       1

#define SSL_COMP_NUM_IDX        2

#ifndef OPENSSL_NO_COMP

static int sk_comp_cmp(const SSL_COMP *const *a, const SSL_COMP *const *b)

{

    return ((*a)->id - (*b)->id);

}

#endif

STACK_OF(SSL_COMP) *ossl_load_builtin_compressions(void)

{

    STACK_OF(SSL_COMP) *comp_methods = NULL;

#ifndef OPENSSL_NO_COMP

    SSL_COMP *comp = NULL;

    COMP_METHOD *method = COMP_zlib();

    comp_methods = sk_SSL_COMP_new(sk_comp_cmp);

    if (COMP_get_type(method) != NID_undef && comp_methods != NULL) {

        comp = OPENSSL_malloc(sizeof(*comp));

        if (comp != NULL) {

            comp->method = method;

            comp->id = SSL_COMP_ZLIB_IDX;

            comp->name = COMP_get_name(method);

            if (!sk_SSL_COMP_push(comp_methods, comp))

                OPENSSL_free(comp);

        }

    }

#endif

    return comp_methods;

}

static void cmeth_free(SSL_COMP *cm)

{

    OPENSSL_free(cm);

}

void ossl_free_compression_methods_int(STACK_OF(SSL_COMP) *methods)

{

    sk_SSL_COMP_pop_free(methods, cmeth_free);

}