/***************************************************************************

 *                                  _   _ ____  _

 *  Project                     ___| | | |  _ \| |

 *                             / __| | | | |_) | |

 *                            | (__| |_| |  _ <| |___

 *                             \___|\___/|_| \_\_____|

 *

 * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.

 *

 * This software is licensed as described in the file COPYING, which

 * you should have received as part of this distribution. The terms

 * are also available at https://curl.se/docs/copyright.html.

 *

 * You may opt to use, copy, modify, merge, publish, distribute and/or sell

 * copies of the Software, and permit persons to whom the Software is

 * furnished to do so, under the terms of the COPYING file.

 *

 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY

 * KIND, either express or implied.

 *

 * SPDX-License-Identifier: curl

 *

 ***************************************************************************/

#include "curl_setup.h"

#include "urldata.h"

#include "bufref.h"

#include "strdup.h"

#include "curl_memory.h"

#include "memdebug.h"

#define SIGNATURE 0x5c48e9b2    /* Random pattern. */

/*

 * Init a bufref struct.

 */

void Curl_bufref_init(struct bufref *br)

{

  DEBUGASSERT(br);

  br->dtor = NULL;

  br->ptr = NULL;

  br->len = 0;

#ifdef DEBUGBUILD

  br->signature = SIGNATURE;

#endif

}

/*

 * Free the buffer and re-init the necessary fields. It doesn't touch the

 * 'signature' field and thus this buffer reference can be reused.

 */

void Curl_bufref_free(struct bufref *br)

{

  DEBUGASSERT(br);

  DEBUGASSERT(br->signature == SIGNATURE);

  DEBUGASSERT(br->ptr || !br->len);

  if(br->ptr && br->dtor)

    br->dtor((void *) br->ptr);

  br->dtor = NULL;

  br->ptr = NULL;

  br->len = 0;

}

/*

 * Set the buffer reference to new values. The previously referenced buffer

 * is released before assignment.

 */

void Curl_bufref_set(struct bufref *br, const void *ptr, size_t len,

                     void (*dtor)(void *))

{

  DEBUGASSERT(ptr || !len);

  DEBUGASSERT(len <= CURL_MAX_INPUT_LENGTH);

  Curl_bufref_free(br);

  br->ptr = (const unsigned char *) ptr;

  br->len = len;

  br->dtor = dtor;

}

/*

 * Get a pointer to the referenced buffer.

 */

const unsigned char *Curl_bufref_ptr(const struct bufref *br)

{

  DEBUGASSERT(br);

  DEBUGASSERT(br->signature == SIGNATURE);

  DEBUGASSERT(br->ptr || !br->len);

  return br->ptr;

}

/*

 * Get the length of the referenced buffer data.

 */

size_t Curl_bufref_len(const struct bufref *br)

{

  DEBUGASSERT(br);

  DEBUGASSERT(br->signature == SIGNATURE);

  DEBUGASSERT(br->ptr || !br->len);

  return br->len;

}

CURLcode Curl_bufref_memdup(struct bufref *br, const void *ptr, size_t len)

{

  unsigned char *cpy = NULL;

  DEBUGASSERT(br);

  DEBUGASSERT(br->signature == SIGNATURE);

  DEBUGASSERT(br->ptr || !br->len);

  DEBUGASSERT(ptr || !len);

  DEBUGASSERT(len <= CURL_MAX_INPUT_LENGTH);

  if(ptr) {

    cpy = Curl_memdup0(ptr, len);

    if(!cpy)

      return CURLE_OUT_OF_MEMORY;

  }

  Curl_bufref_set(br, cpy, len, curl_free);

  return CURLE_OK;

}