1 /* crypto/bio/bf_null.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>
63 #include <openssl/evp.h>
65 /* BIO_put and BIO_get both add to the digest,
66 * BIO_gets returns the digest */
68 static int nullf_write(BIO *h,char *buf,int num);
69 static int nullf_read(BIO *h,char *buf,int size);
70 static int nullf_puts(BIO *h,char *str);
71 static int nullf_gets(BIO *h,char *str,int size);
72 static long nullf_ctrl(BIO *h,int cmd,long arg1,char *arg2);
73 static int nullf_new(BIO *h);
74 static int nullf_free(BIO *data);
75 static long nullf_callback_ctrl(BIO *h,int cmd,void (*fp)());
76 static BIO_METHOD methods_nullf=
90 BIO_METHOD *BIO_f_null(void)
92 return(&methods_nullf);
95 static int nullf_new(BIO *bi)
103 static int nullf_free(BIO *a)
105 if (a == NULL) return(0);
112 static int nullf_read(BIO *b, char *out, int outl)
116 if (out == NULL) return(0);
117 if (b->next_bio == NULL) return(0);
118 ret=BIO_read(b->next_bio,out,outl);
119 BIO_clear_retry_flags(b);
120 BIO_copy_next_retry(b);
124 static int nullf_write(BIO *b, char *in, int inl)
128 if ((in == NULL) || (inl <= 0)) return(0);
129 if (b->next_bio == NULL) return(0);
130 ret=BIO_write(b->next_bio,in,inl);
131 BIO_clear_retry_flags(b);
132 BIO_copy_next_retry(b);
136 static long nullf_ctrl(BIO *b, int cmd, long num, char *ptr)
140 if (b->next_bio == NULL) return(0);
143 case BIO_C_DO_STATE_MACHINE:
144 BIO_clear_retry_flags(b);
145 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
146 BIO_copy_next_retry(b);
152 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
157 static long nullf_callback_ctrl(BIO *b, int cmd, void (*fp)())
161 if (b->next_bio == NULL) return(0);
165 ret=BIO_callback_ctrl(b->next_bio,cmd,fp);
171 static int nullf_gets(BIO *bp, char *buf, int size)
173 if (bp->next_bio == NULL) return(0);
174 return(BIO_gets(bp->next_bio,buf,size));
178 static int nullf_puts(BIO *bp, char *str)
180 if (bp->next_bio == NULL) return(0);
181 return(BIO_puts(bp->next_bio,str));