1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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.
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).
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.
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
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)"
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
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.]
60 #include "internal/cryptlib.h"
61 #include <openssl/bio.h>
64 * BIO_put and BIO_get both add to the digest, BIO_gets returns the digest
67 static int nullf_write(BIO *h, const char *buf, int num);
68 static int nullf_read(BIO *h, char *buf, int size);
69 static int nullf_puts(BIO *h, const char *str);
70 static int nullf_gets(BIO *h, char *str, int size);
71 static long nullf_ctrl(BIO *h, int cmd, long arg1, void *arg2);
72 static int nullf_new(BIO *h);
73 static int nullf_free(BIO *data);
74 static long nullf_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp);
75 static const BIO_METHOD methods_nullf = {
88 const BIO_METHOD *BIO_f_null(void)
90 return (&methods_nullf);
93 static int nullf_new(BIO *bi)
101 static int nullf_free(BIO *a)
113 static int nullf_read(BIO *b, char *out, int outl)
119 if (b->next_bio == NULL)
121 ret = BIO_read(b->next_bio, out, outl);
122 BIO_clear_retry_flags(b);
123 BIO_copy_next_retry(b);
127 static int nullf_write(BIO *b, const char *in, int inl)
131 if ((in == NULL) || (inl <= 0))
133 if (b->next_bio == NULL)
135 ret = BIO_write(b->next_bio, in, inl);
136 BIO_clear_retry_flags(b);
137 BIO_copy_next_retry(b);
141 static long nullf_ctrl(BIO *b, int cmd, long num, void *ptr)
145 if (b->next_bio == NULL)
148 case BIO_C_DO_STATE_MACHINE:
149 BIO_clear_retry_flags(b);
150 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
151 BIO_copy_next_retry(b);
157 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
162 static long nullf_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
166 if (b->next_bio == NULL)
170 ret = BIO_callback_ctrl(b->next_bio, cmd, fp);
176 static int nullf_gets(BIO *bp, char *buf, int size)
178 if (bp->next_bio == NULL)
180 return (BIO_gets(bp->next_bio, buf, size));
183 static int nullf_puts(BIO *bp, const char *str)
185 if (bp->next_bio == NULL)
187 return (BIO_puts(bp->next_bio, str));