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 <string.h>
60
61#include <openssl/mem.h>
62#include <openssl/err.h>
63
64
65BUF_MEM *BUF_MEM_new(void) {
66  BUF_MEM *ret;
67
68  ret = OPENSSL_malloc(sizeof(BUF_MEM));
69  if (ret == NULL) {
70    OPENSSL_PUT_ERROR(BUF, ERR_R_MALLOC_FAILURE);
71    return NULL;
72  }
73
74  memset(ret, 0, sizeof(BUF_MEM));
75  return ret;
76}
77
78void BUF_MEM_free(BUF_MEM *buf) {
79  if (buf == NULL) {
80    return;
81  }
82
83  if (buf->data != NULL) {
84    OPENSSL_cleanse(buf->data, buf->max);
85    OPENSSL_free(buf->data);
86  }
87
88  OPENSSL_free(buf);
89}
90
91static size_t buf_mem_grow(BUF_MEM *buf, size_t len, char clean) {
92  char *new_buf;
93  size_t n, alloc_size;
94
95  if (buf->length >= len) {
96    buf->length = len;
97    return len;
98  }
99  if (buf->max >= len) {
100    memset(&buf->data[buf->length], 0, len - buf->length);
101    buf->length = len;
102    return len;
103  }
104
105  n = len + 3;
106  if (n < len) {
107    /* overflow */
108    OPENSSL_PUT_ERROR(BUF, ERR_R_MALLOC_FAILURE);
109    return 0;
110  }
111  n = n / 3;
112  alloc_size = n * 4;
113  if (alloc_size / 4 != n) {
114    /* overflow */
115    OPENSSL_PUT_ERROR(BUF, ERR_R_MALLOC_FAILURE);
116    return 0;
117  }
118
119  if (buf->data == NULL) {
120    new_buf = OPENSSL_malloc(alloc_size);
121  } else {
122    if (clean) {
123      new_buf = OPENSSL_realloc_clean(buf->data, buf->max, alloc_size);
124    } else {
125      new_buf = OPENSSL_realloc(buf->data, alloc_size);
126    }
127  }
128
129  if (new_buf == NULL) {
130    OPENSSL_PUT_ERROR(BUF, ERR_R_MALLOC_FAILURE);
131    len = 0;
132  } else {
133    buf->data = new_buf;
134    buf->max = alloc_size;
135    memset(&buf->data[buf->length], 0, len - buf->length);
136    buf->length = len;
137  }
138
139  return len;
140}
141
142size_t BUF_MEM_grow(BUF_MEM *buf, size_t len) {
143  return buf_mem_grow(buf, len, 0 /* don't clear old buffer contents. */);
144}
145
146size_t BUF_MEM_grow_clean(BUF_MEM *buf, size_t len) {
147  return buf_mem_grow(buf, len, 1 /* clear old buffer contents. */);
148}
149
150char *BUF_strdup(const char *buf) {
151  if (buf == NULL) {
152    return NULL;
153  }
154
155  return BUF_strndup(buf, strlen(buf));
156}
157
158size_t BUF_strnlen(const char *str, size_t max_len) {
159  size_t i;
160
161  for (i = 0; i < max_len; i++) {
162    if (str[i] == 0) {
163      break;
164    }
165  }
166
167  return i;
168}
169
170char *BUF_strndup(const char *buf, size_t size) {
171  char *ret;
172  size_t alloc_size;
173
174  if (buf == NULL) {
175    return NULL;
176  }
177
178  size = BUF_strnlen(buf, size);
179
180  alloc_size = size + 1;
181  if (alloc_size < size) {
182    /* overflow */
183    OPENSSL_PUT_ERROR(BUF, ERR_R_MALLOC_FAILURE);
184    return NULL;
185  }
186  ret = OPENSSL_malloc(alloc_size);
187  if (ret == NULL) {
188    OPENSSL_PUT_ERROR(BUF, ERR_R_MALLOC_FAILURE);
189    return NULL;
190  }
191
192  memcpy(ret, buf, size);
193  ret[size] = '\0';
194  return ret;
195}
196
197size_t BUF_strlcpy(char *dst, const char *src, size_t dst_size) {
198  size_t l = 0;
199
200  for (; dst_size > 1 && *src; dst_size--) {
201    *dst++ = *src++;
202    l++;
203  }
204
205  if (dst_size) {
206    *dst = 0;
207  }
208
209  return l + strlen(src);
210}
211
212size_t BUF_strlcat(char *dst, const char *src, size_t dst_size) {
213  size_t l = 0;
214  for (; dst_size > 0 && *dst; dst_size--, dst++) {
215    l++;
216  }
217  return l + BUF_strlcpy(dst, src, dst_size);
218}
219
220void *BUF_memdup(const void *data, size_t dst_size) {
221  void *ret;
222
223  if (dst_size == 0) {
224    return NULL;
225  }
226
227  ret = OPENSSL_malloc(dst_size);
228  if (ret == NULL) {
229    OPENSSL_PUT_ERROR(BUF, ERR_R_MALLOC_FAILURE);
230    return NULL;
231  }
232
233  memcpy(ret, data, dst_size);
234  return ret;
235}
236