1/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
2 * All rights reserved.
3 *
4 * This package is an SSL implementation written
5 * by Eric Young (eay@cryptsoft.com).
6 * The implementation was written so as to conform with Netscapes SSL.
7 *
8 * This library is free for commercial and non-commercial use as long as
9 * the following conditions are aheared to.  The following conditions
10 * apply to all code found in this distribution, be it the RC4, RSA,
11 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
12 * included with this distribution is covered by the same copyright terms
13 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
14 *
15 * Copyright remains Eric Young's, and as such any Copyright notices in
16 * the code are not to be removed.
17 * If this package is used in a product, Eric Young should be given attribution
18 * as the author of the parts of the library used.
19 * This can be in the form of a textual message at program startup or
20 * in documentation (online or textual) provided with the package.
21 *
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
24 * are met:
25 * 1. Redistributions of source code must retain the copyright
26 *    notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 *    notice, this list of conditions and the following disclaimer in the
29 *    documentation and/or other materials provided with the distribution.
30 * 3. All advertising materials mentioning features or use of this software
31 *    must display the following acknowledgement:
32 *    "This product includes cryptographic software written by
33 *     Eric Young (eay@cryptsoft.com)"
34 *    The word 'cryptographic' can be left out if the rouines from the library
35 *    being used are not cryptographic related :-).
36 * 4. If you include any Windows specific code (or a derivative thereof) from
37 *    the apps directory (application code) you must include an acknowledgement:
38 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
50 * SUCH DAMAGE.
51 *
52 * The licence and distribution terms for any publically available version or
53 * derivative of this code cannot be changed.  i.e. this code cannot simply be
54 * copied and put under another distribution licence
55 * [including the GNU Public Licence.] */
56
57#include <openssl/buf.h>
58
59#include <openssl/mem.h>
60#include <openssl/err.h>
61
62
63BUF_MEM *BUF_MEM_new(void) {
64  BUF_MEM *ret;
65
66  ret = OPENSSL_malloc(sizeof(BUF_MEM));
67  if (ret == NULL) {
68    OPENSSL_PUT_ERROR(BUF, BUF_MEM_new, ERR_R_MALLOC_FAILURE);
69    return NULL;
70  }
71
72  memset(ret, 0, sizeof(BUF_MEM));
73  return ret;
74}
75
76void BUF_MEM_free(BUF_MEM *buf) {
77  if (buf == NULL) {
78    return;
79  }
80
81  if (buf->data != NULL) {
82    OPENSSL_cleanse(buf->data, buf->max);
83    OPENSSL_free(buf->data);
84  }
85
86  OPENSSL_free(buf);
87}
88
89static size_t buf_mem_grow(BUF_MEM *buf, size_t len, char clean) {
90  char *new_buf;
91  size_t n, alloc_size;
92
93  if (buf->length >= len) {
94    buf->length = len;
95    return len;
96  }
97  if (buf->max >= len) {
98    memset(&buf->data[buf->length], 0, len - buf->length);
99    buf->length = len;
100    return len;
101  }
102
103  n = len + 3;
104  if (n < len) {
105    /* overflow */
106    OPENSSL_PUT_ERROR(BUF, buf_mem_grow, ERR_R_MALLOC_FAILURE);
107    return 0;
108  }
109  n = n / 3;
110  alloc_size = n * 4;
111  if (alloc_size / 4 != n) {
112    /* overflow */
113    OPENSSL_PUT_ERROR(BUF, buf_mem_grow, ERR_R_MALLOC_FAILURE);
114    return 0;
115  }
116
117  if (buf->data == NULL) {
118    new_buf = OPENSSL_malloc(alloc_size);
119  } else {
120    if (clean) {
121      new_buf = OPENSSL_realloc_clean(buf->data, buf->max, alloc_size);
122    } else {
123      new_buf = OPENSSL_realloc(buf->data, alloc_size);
124    }
125  }
126
127  if (new_buf == NULL) {
128    OPENSSL_PUT_ERROR(BUF, buf_mem_grow, ERR_R_MALLOC_FAILURE);
129    len = 0;
130  } else {
131    buf->data = new_buf;
132    buf->max = alloc_size;
133    memset(&buf->data[buf->length], 0, len - buf->length);
134    buf->length = len;
135  }
136
137  return len;
138}
139
140size_t BUF_MEM_grow(BUF_MEM *buf, size_t len) {
141  return buf_mem_grow(buf, len, 0 /* don't clear old buffer contents. */);
142}
143
144size_t BUF_MEM_grow_clean(BUF_MEM *buf, size_t len) {
145  return buf_mem_grow(buf, len, 1 /* clear old buffer contents. */);
146}
147
148char *BUF_strdup(const char *buf) {
149  if (buf == NULL) {
150    return NULL;
151  }
152
153  return BUF_strndup(buf, strlen(buf));
154}
155
156size_t BUF_strnlen(const char *str, size_t max_len) {
157  size_t i;
158
159  for (i = 0; i < max_len; i++) {
160    if (str[i] == 0) {
161      break;
162    }
163  }
164
165  return i;
166}
167
168char *BUF_strndup(const char *buf, size_t size) {
169  char *ret;
170  size_t alloc_size;
171
172  if (buf == NULL) {
173    return NULL;
174  }
175
176  size = BUF_strnlen(buf, size);
177
178  alloc_size = size + 1;
179  if (alloc_size < size) {
180    /* overflow */
181    OPENSSL_PUT_ERROR(BUF, BUF_strndup, ERR_R_MALLOC_FAILURE);
182    return NULL;
183  }
184  ret = OPENSSL_malloc(alloc_size);
185  if (ret == NULL) {
186    OPENSSL_PUT_ERROR(BUF, BUF_strndup, ERR_R_MALLOC_FAILURE);
187    return NULL;
188  }
189
190  BUF_strlcpy(ret, buf, alloc_size);
191  return ret;
192}
193
194size_t BUF_strlcpy(char *dst, const char *src, size_t dst_size) {
195  size_t l = 0;
196
197  for (; dst_size > 1 && *src; dst_size--) {
198    *dst++ = *src++;
199    l++;
200  }
201
202  if (dst_size) {
203    *dst = 0;
204  }
205
206  return l + strlen(src);
207}
208
209size_t BUF_strlcat(char *dst, const char *src, size_t dst_size) {
210  size_t l = 0;
211  for (; dst_size > 0 && *dst; dst_size--, dst++) {
212    l++;
213  }
214  return l + BUF_strlcpy(dst, src, dst_size);
215}
216
217void *BUF_memdup(const void *data, size_t dst_size) {
218  void *ret;
219
220  if (data == NULL) {
221    return NULL;
222  }
223
224  ret = OPENSSL_malloc(dst_size);
225  if (ret == NULL) {
226    OPENSSL_PUT_ERROR(BUF, BUF_memdup, ERR_R_MALLOC_FAILURE);
227    return NULL;
228  }
229
230  memcpy(ret, data, dst_size);
231  return ret;
232}
233