/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/*
 * item.c
 *
 * This contains some item-manipulation code.
 */

#ifndef BASE_H
#include "base.h"
#endif /* BASE_H */

/*
 * nssItem_Create
 *
 * -- fgmr comments --
 *
 * The error may be one of the following values:
 *  NSS_ERROR_INVALID_ARENA
 *  NSS_ERROR_NO_MEMORY
 *  NSS_ERROR_ARENA_MARKED_BY_ANOTHER_THREAD
 *  NSS_ERROR_INVALID_POINTER
 *
 * Return value:
 *  A pointer to an NSSItem upon success
 *  NULL upon failure
 */

NSS_IMPLEMENT NSSItem *
nssItem_Create(NSSArena *arenaOpt, NSSItem *rvOpt, PRUint32 length,
               const void *data)
{
    NSSItem *rv = (NSSItem *)NULL;

#ifdef DEBUG
    if ((NSSArena *)NULL != arenaOpt) {
        if (PR_SUCCESS != nssArena_verifyPointer(arenaOpt)) {
            return (NSSItem *)NULL;
        }
    }

    if ((const void *)NULL == data) {
        if (length > 0) {
            nss_SetError(NSS_ERROR_INVALID_POINTER);
            return (NSSItem *)NULL;
        }
    }
#endif /* DEBUG */

    if ((NSSItem *)NULL == rvOpt) {
        rv = (NSSItem *)nss_ZNEW(arenaOpt, NSSItem);
        if ((NSSItem *)NULL == rv) {
            goto loser;
        }
    } else {
        rv = rvOpt;
    }

    rv->size = length;
    rv->data = nss_ZAlloc(arenaOpt, length);
    if ((void *)NULL == rv->data) {
        goto loser;
    }

    if (length > 0) {
        (void)nsslibc_memcpy(rv->data, data, length);
    }

    return rv;

loser:
    if (rv != rvOpt) {
        nss_ZFreeIf(rv);
    }

    return (NSSItem *)NULL;
}

NSS_IMPLEMENT void
nssItem_Destroy(NSSItem *item)
{
    nss_ClearErrorStack();

    nss_ZFreeIf(item->data);
    nss_ZFreeIf(item);
}

/*
 * nssItem_Duplicate
 *
 * -- fgmr comments --
 *
 * The error may be one of the following values:
 *  NSS_ERROR_INVALID_ARENA
 *  NSS_ERROR_NO_MEMORY
 *  NSS_ERROR_ARENA_MARKED_BY_ANOTHER_THREAD
 *  NSS_ERROR_INVALID_ITEM
 *
 * Return value:
 *  A pointer to an NSSItem upon success
 *  NULL upon failure
 */

NSS_IMPLEMENT NSSItem *
nssItem_Duplicate(NSSItem *obj, NSSArena *arenaOpt, NSSItem *rvOpt)
{
#ifdef DEBUG
    if ((NSSArena *)NULL != arenaOpt) {
        if (PR_SUCCESS != nssArena_verifyPointer(arenaOpt)) {
            return (NSSItem *)NULL;
        }
    }

    if ((NSSItem *)NULL == obj) {
        nss_SetError(NSS_ERROR_INVALID_ITEM);
        return (NSSItem *)NULL;
    }
#endif /* DEBUG */

    return nssItem_Create(arenaOpt, rvOpt, obj->size, obj->data);
}

#ifdef DEBUG
/*
 * nssItem_verifyPointer
 *
 * -- fgmr comments --
 *
 * The error may be one of the following values:
 *  NSS_ERROR_INVALID_ITEM
 *
 * Return value:
 *  PR_SUCCESS upon success
 *  PR_FAILURE upon failure
 */

NSS_IMPLEMENT PRStatus
nssItem_verifyPointer(const NSSItem *item)
{
    if (((const NSSItem *)NULL == item) ||
        (((void *)NULL == item->data) && (item->size > 0))) {
        nss_SetError(NSS_ERROR_INVALID_ITEM);
        return PR_FAILURE;
    }

    return PR_SUCCESS;
}
#endif /* DEBUG */

/*
 * nssItem_Equal
 *
 * -- fgmr comments --
 *
 * The error may be one of the following values:
 *  NSS_ERROR_INVALID_ITEM
 *
 * Return value:
 *  PR_TRUE if the items are identical
 *  PR_FALSE if they aren't
 *  PR_FALSE upon error
 */

NSS_IMPLEMENT PRBool
nssItem_Equal(const NSSItem *one, const NSSItem *two, PRStatus *statusOpt)
{
    if ((PRStatus *)NULL != statusOpt) {
        *statusOpt = PR_SUCCESS;
    }

    if (((const NSSItem *)NULL == one) && ((const NSSItem *)NULL == two)) {
        return PR_TRUE;
    }

    if (((const NSSItem *)NULL == one) || ((const NSSItem *)NULL == two)) {
        return PR_FALSE;
    }

    if (one->size != two->size) {
        return PR_FALSE;
    }

    return nsslibc_memequal(one->data, two->data, one->size, statusOpt);
}