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/*
 * Copyright 2001-2018 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 "internal/cryptlib.h"
#include <openssl/evp.h>
#include <openssl/lhash.h>
#include <openssl/trace.h>
#include "eng_local.h"

/* The type of the items in the table */
struct st_engine_pile {
    /* The 'nid' of this algorithm/mode */
    int nid;
    /* ENGINEs that implement this algorithm/mode. */
    STACK_OF(ENGINE) *sk;
    /* The default ENGINE to perform this algorithm/mode. */
    ENGINE *funct;
    /*
     * Zero if 'sk' is newer than the cached 'funct', non-zero otherwise
     */
    int uptodate;
};

/* The type exposed in eng_local.h */
struct st_engine_table {
    LHASH_OF(ENGINE_PILE) piles;
};                              /* ENGINE_TABLE */

typedef struct st_engine_pile_doall {
    engine_table_doall_cb *cb;
    void *arg;
} ENGINE_PILE_DOALL;

/* Global flags (ENGINE_TABLE_FLAG_***). */
static unsigned int table_flags = 0;

/* API function manipulating 'table_flags' */
unsigned int ENGINE_get_table_flags(void)
{
    return table_flags;
}

void ENGINE_set_table_flags(unsigned int flags)
{
    table_flags = flags;
}

/* Internal functions for the "piles" hash table */
static unsigned long engine_pile_hash(const ENGINE_PILE *c)
{
    return c->nid;
}

static int engine_pile_cmp(const ENGINE_PILE *a, const ENGINE_PILE *b)
{
    return a->nid - b->nid;
}

static int int_table_check(ENGINE_TABLE **t, int create)
{
    LHASH_OF(ENGINE_PILE) *lh;

    if (*t)
        return 1;
    if (!create)
        return 0;
    if ((lh = lh_ENGINE_PILE_new(engine_pile_hash, engine_pile_cmp)) == NULL)
        return 0;
    *t = (ENGINE_TABLE *)lh;
    return 1;
}

/*
 * Privately exposed (via eng_local.h) functions for adding and/or removing
 * ENGINEs from the implementation table
 */
int engine_table_register(ENGINE_TABLE **table, ENGINE_CLEANUP_CB *cleanup,
                          ENGINE *e, const int *nids, int num_nids,
                          int setdefault)
{
    int ret = 0, added = 0;
    ENGINE_PILE tmplate, *fnd;
    CRYPTO_THREAD_write_lock(global_engine_lock);


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