1 /* crypto/bio/bss_mem.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
62 #include <openssl/bio.h>
64 static int mem_write(BIO *h, const char *buf, int num);
65 static int mem_read(BIO *h, char *buf, int size);
66 static int mem_puts(BIO *h, const char *str);
67 static int mem_gets(BIO *h, char *str, int size);
68 static long mem_ctrl(BIO *h, int cmd, long arg1, void *arg2);
69 static int mem_new(BIO *h);
70 static int mem_free(BIO *data);
71 static BIO_METHOD mem_method = {
85 * bio->num is used to hold the value to return on 'empty', if it is 0,
86 * should_retry is not set
89 BIO_METHOD *BIO_s_mem(void)
95 BIO *BIO_new_mem_buf(const void *buf, int len)
102 BIOerr(BIO_F_BIO_NEW_MEM_BUF, BIO_R_NULL_PARAMETER);
105 sz = (len < 0) ? strlen(buf) : (size_t)len;
106 if (!(ret = BIO_new(BIO_s_mem())))
108 b = (BUF_MEM *)ret->ptr;
109 /* Cast away const and trust in the MEM_RDONLY flag. */
110 b->data = (void *)buf;
113 ret->flags |= BIO_FLAGS_MEM_RDONLY;
114 /* Since this is static data retrying wont help */
119 static int mem_new(BIO *bi)
123 if ((b = BUF_MEM_new()) == NULL)
132 static int mem_free(BIO *a)
137 if ((a->init) && (a->ptr != NULL)) {
139 b = (BUF_MEM *)a->ptr;
140 if (a->flags & BIO_FLAGS_MEM_RDONLY)
149 static int mem_read(BIO *b, char *out, int outl)
154 bm = (BUF_MEM *)b->ptr;
155 BIO_clear_retry_flags(b);
156 ret = (outl >= 0 && (size_t)outl > bm->length) ? (int)bm->length : outl;
157 if ((out != NULL) && (ret > 0)) {
158 memcpy(out, bm->data, ret);
160 if (b->flags & BIO_FLAGS_MEM_RDONLY)
163 memmove(&(bm->data[0]), &(bm->data[ret]), bm->length);
165 } else if (bm->length == 0) {
168 BIO_set_retry_read(b);
173 static int mem_write(BIO *b, const char *in, int inl)
179 bm = (BUF_MEM *)b->ptr;
181 BIOerr(BIO_F_MEM_WRITE, BIO_R_NULL_PARAMETER);
185 if (b->flags & BIO_FLAGS_MEM_RDONLY) {
186 BIOerr(BIO_F_MEM_WRITE, BIO_R_WRITE_TO_READ_ONLY_BIO);
190 BIO_clear_retry_flags(b);
192 if (BUF_MEM_grow_clean(bm, blen + inl) != (blen + inl))
194 memcpy(&(bm->data[blen]), in, inl);
200 static long mem_ctrl(BIO *b, int cmd, long num, void *ptr)
205 BUF_MEM *bm = (BUF_MEM *)b->ptr;
209 if (bm->data != NULL) {
210 /* For read only case reset to the start again */
211 if (b->flags & BIO_FLAGS_MEM_RDONLY) {
212 bm->data -= bm->max - bm->length;
213 bm->length = bm->max;
215 memset(bm->data, 0, bm->max);
221 ret = (long)(bm->length == 0);
223 case BIO_C_SET_BUF_MEM_EOF_RETURN:
227 ret = (long)bm->length;
230 *pptr = (char *)&(bm->data[0]);
233 case BIO_C_SET_BUF_MEM:
235 b->shutdown = (int)num;
238 case BIO_C_GET_BUF_MEM_PTR:
244 case BIO_CTRL_GET_CLOSE:
245 ret = (long)b->shutdown;
247 case BIO_CTRL_SET_CLOSE:
248 b->shutdown = (int)num;
251 case BIO_CTRL_WPENDING:
254 case BIO_CTRL_PENDING:
255 ret = (long)bm->length;
270 static int mem_gets(BIO *bp, char *buf, int size)
275 BUF_MEM *bm = (BUF_MEM *)bp->ptr;
277 BIO_clear_retry_flags(bp);
286 for (i = 0; i < j; i++) {
294 * i is now the max num of bytes to copy, either j or up to
295 * and including the first newline
298 i = mem_read(bp, buf, i);
305 static int mem_puts(BIO *bp, const char *str)
310 ret = mem_write(bp, str, n);
311 /* memory semantics is that it will always work */