/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)

 * All rights reserved.

 *

 * This package is an SSL implementation written

 * by Eric Young (eay@cryptsoft.com).

 * The implementation was written so as to conform with Netscapes SSL.

 *

 * This library is free for commercial and non-commercial use as long as

 * the following conditions are aheared to.  The following conditions

 * apply to all code found in this distribution, be it the RC4, RSA,

 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation

 * included with this distribution is covered by the same copyright terms

 * except that the holder is Tim Hudson (tjh@cryptsoft.com).

 *

 * Copyright remains Eric Young's, and as such any Copyright notices in

 * the code are not to be removed.

 * If this package is used in a product, Eric Young should be given attribution

 * as the author of the parts of the library used.

 * This can be in the form of a textual message at program startup or

 * in documentation (online or textual) provided with the package.

 *

 * 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 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. All advertising materials mentioning features or use of this software

 *    must display the following acknowledgement:

 *    "This product includes cryptographic software written by

 *     Eric Young (eay@cryptsoft.com)"

 *    The word 'cryptographic' can be left out if the rouines from the library

 *    being used are not cryptographic related :-).

 * 4. If you include any Windows specific code (or a derivative thereof) from

 *    the apps directory (application code) you must include an acknowledgement:

 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"

 *

 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``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 AUTHOR 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.

 *

 * The licence and distribution terms for any publically available version or

 * derivative of this code cannot be changed.  i.e. this code cannot simply be

 * copied and put under another distribution licence

 * [including the GNU Public Licence.] */

#include <openssl/buf.h>

#include <string.h>

#include <openssl/mem.h>

#include <openssl/err.h>

#include "../internal.h"

BUF_MEM *BUF_MEM_new(void) {

  BUF_MEM *ret;

  ret = OPENSSL_malloc(sizeof(BUF_MEM));

  if (ret == NULL) {

    return NULL;

  }

  OPENSSL_memset(ret, 0, sizeof(BUF_MEM));

  return ret;

}

void BUF_MEM_free(BUF_MEM *buf) {

  if (buf == NULL) {

    return;

  }

  OPENSSL_free(buf->data);

  OPENSSL_free(buf);

}

int BUF_MEM_reserve(BUF_MEM *buf, size_t cap) {

  if (buf->max >= cap) {

    return 1;

  }

  size_t n = cap + 3;

  if (n < cap) {

    OPENSSL_PUT_ERROR(BUF, ERR_R_OVERFLOW);

    return 0;

  }

  n = n / 3;

  size_t alloc_size = n * 4;

  if (alloc_size / 4 != n) {

    OPENSSL_PUT_ERROR(BUF, ERR_R_OVERFLOW);

    return 0;

  }

  char *new_buf = OPENSSL_realloc(buf->data, alloc_size);

  if (new_buf == NULL) {

    return 0;

  }

  buf->data = new_buf;

  buf->max = alloc_size;

  return 1;

}

size_t BUF_MEM_grow(BUF_MEM *buf, size_t len) {

  if (!BUF_MEM_reserve(buf, len)) {

    return 0;

  }

  if (buf->length < len) {

    OPENSSL_memset(&buf->data[buf->length], 0, len - buf->length);

  }

  buf->length = len;

  return len;

}

size_t BUF_MEM_grow_clean(BUF_MEM *buf, size_t len) {

  return BUF_MEM_grow(buf, len);

}

int BUF_MEM_append(BUF_MEM *buf, const void *in, size_t len) {

  // Work around a C language bug. See https://crbug.com/1019588.

  if (len == 0) {

    return 1;

  }

  size_t new_len = buf->length + len;

  if (new_len < len) {

    OPENSSL_PUT_ERROR(BUF, ERR_R_OVERFLOW);

    return 0;

  }

  if (!BUF_MEM_reserve(buf, new_len)) {

    return 0;

  }

  OPENSSL_memcpy(buf->data + buf->length, in, len);

  buf->length = new_len;

  return 1;

}

char *BUF_strdup(const char *str) { return OPENSSL_strdup(str); }

size_t BUF_strnlen(const char *str, size_t max_len) {

  return OPENSSL_strnlen(str, max_len);

}

char *BUF_strndup(const char *str, size_t size) {

  return OPENSSL_strndup(str, size);

}

size_t BUF_strlcpy(char *dst, const char *src, size_t dst_size) {

  return OPENSSL_strlcpy(dst, src, dst_size);

}

size_t BUF_strlcat(char *dst, const char *src, size_t dst_size) {

  return OPENSSL_strlcat(dst, src, dst_size);

}

void *BUF_memdup(const void *data, size_t size) {

  return OPENSSL_memdup(data, size);

}