/*

 * Copyright (c) 2011 Kungliga Tekniska Högskolan

 * (Royal Institute of Technology, Stockholm, Sweden).

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 *

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 *

 * 3. Neither the name of the Institute nor the names of its contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 */

#include "baselocl.h"

#include <string.h>

static void HEIM_CALLCONV

data_dealloc(void *ptr)

{

    heim_data_t d = ptr;

    heim_octet_string *os = (heim_octet_string *)d;

    heim_data_free_f_t *deallocp;

    heim_data_free_f_t dealloc;

    if (os->data == NULL)

  return;

    /* Possible string ref */

    deallocp = _heim_get_isaextra(os, 0);

    dealloc = *deallocp;

    if (dealloc != NULL)

  dealloc(os->data);

}

static int

data_cmp(void *a, void *b)

{

    heim_octet_string *osa = a, *osb = b;

    if (osa->length != osb->length)

  return osa->length - osb->length;

    return memcmp(osa->data, osb->data, osa->length);

}

static uintptr_t

data_hash(void *ptr)

{

    heim_octet_string *os = ptr;

    const unsigned char *s = os->data;

    if (os->length < 4)

  return os->length;

    return ((unsigned long)s[os->length - 1] << 24)

  | (s[os->length - 2] << 16) | (s[1] << 8) | s[0];

}

struct heim_type_data _heim_data_object = {

    HEIM_TID_DATA,

    "data-object",

    NULL,

    data_dealloc,

    NULL,

    data_cmp,

    data_hash,

    NULL

};

/**

 * Create a data object

 *

 * @param string the string to create, must be an utf8 string

 *

 * @return string object

 */

heim_data_t

heim_data_create(const void *data, size_t length)

{

    heim_octet_string *os;

    os = _heim_alloc_object(&_heim_data_object, sizeof(*os) + length);

    if (os) {

  os->data = (uint8_t *)os + sizeof(*os);

  os->length = length;

  memcpy(os->data, data, length);

    }

    return (heim_data_t)os;

}

heim_data_t

heim_data_ref_create(const void *data, size_t length,

         heim_data_free_f_t dealloc)

{

    heim_octet_string *os;

    heim_data_free_f_t *deallocp;

    os = _heim_alloc_object(&_heim_data_object, sizeof(*os) + length);

    if (os) {

  os->data = (void *)data;

  os->length = length;

  deallocp = _heim_get_isaextra(os, 0);

  *deallocp = dealloc;

    }

    return (heim_data_t)os;

}

/**

 * Return the type ID of data objects

 *

 * @return type id of data objects

 */

heim_tid_t

heim_data_get_type_id(void)

{

    return HEIM_TID_DATA;

}

/**

 * Get the data value of the content.

 *

 * @param data the data object to get the value from

 *

 * @return a heim_octet_string

 */

const heim_octet_string *

heim_data_get_data(heim_data_t data)

{

    /* Note that this works for data and data_ref objects */

    return (const heim_octet_string *)data;

}

const void *

heim_data_get_ptr(heim_data_t data)

{

    /* Note that this works for data and data_ref objects */

    return ((const heim_octet_string *)data)->data;

}

size_t  heim_data_get_length(heim_data_t data)

{

    /* Note that this works for data and data_ref objects */

    return ((const heim_octet_string *)data)->length;

}