crypto/bio/bf_null.c

   1 /* crypto/bio/bf_null.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   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.
   8  *
   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).
  15  *
  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.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  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)"
  40  *
  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
  51  * SUCH DAMAGE.
  52  *
  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.]
  57  */
  58
  59 #include <stdio.h>
  60 #include <errno.h>
  61 #include "cryptlib.h"
  62 #include "bio.h"
  63 #include "evp.h"
  64
  65 /* BIO_put and BIO_get both add to the digest,
  66  * BIO_gets returns the digest */
  67
  68 #ifndef NOPROTO
  69 static int nullf_write(BIO *h,char *buf,int num);
  70 static int nullf_read(BIO *h,char *buf,int size);
  71 static int nullf_puts(BIO *h,char *str);
  72 static int nullf_gets(BIO *h,char *str,int size);
  73 static long nullf_ctrl(BIO *h,int cmd,long arg1,char *arg2);
  74 static int nullf_new(BIO *h);
  75 static int nullf_free(BIO *data);
  76 #else
  77 static int nullf_write();
  78 static int nullf_read();
  79 static int nullf_puts();
  80 static int nullf_gets();
  81 static long nullf_ctrl();
  82 static int nullf_new();
  83 static int nullf_free();
  84 #endif
  85
  86 static BIO_METHOD methods_nullf=
  87         {
  88         BIO_TYPE_NULL_FILTER,
  89         "NULL filter",
  90         nullf_write,
  91         nullf_read,
  92         nullf_puts,
  93         nullf_gets,
  94         nullf_ctrl,
  95         nullf_new,
  96         nullf_free,
  97         };
  98
  99 BIO_METHOD *BIO_f_null()
 100         {
 101         return(&methods_nullf);
 102         }
 103
 104 static int nullf_new(bi)
 105 BIO *bi;
 106         {
 107         bi->init=1;
 108         bi->ptr=NULL;
 109         bi->flags=0;
 110         return(1);
 111         }
 112
 113 static int nullf_free(a)
 114 BIO *a;
 115         {
 116         if (a == NULL) return(0);
 117 /*      a->ptr=NULL;
 118         a->init=0;
 119         a->flags=0;*/
 120         return(1);
 121         }
 122
 123 static int nullf_read(b,out,outl)
 124 BIO *b;
 125 char *out;
 126 int outl;
 127         {
 128         int ret=0;
 129
 130         if (out == NULL) return(0);
 131         if (b->next_bio == NULL) return(0);
 132         ret=BIO_read(b->next_bio,out,outl);
 133         BIO_clear_retry_flags(b);
 134         BIO_copy_next_retry(b);
 135         return(ret);
 136         }
 137
 138 static int nullf_write(b,in,inl)
 139 BIO *b;
 140 char *in;
 141 int inl;
 142         {
 143         int ret=0;
 144
 145         if ((in == NULL) || (inl <= 0)) return(0);
 146         if (b->next_bio == NULL) return(0);
 147         ret=BIO_write(b->next_bio,in,inl);
 148         BIO_clear_retry_flags(b);
 149         BIO_copy_next_retry(b);
 150         return(ret);
 151         }
 152
 153 static long nullf_ctrl(b,cmd,num,ptr)
 154 BIO *b;
 155 int cmd;
 156 long num;
 157 char *ptr;
 158         {
 159         long ret;
 160
 161         if (b->next_bio == NULL) return(0);
 162         switch(cmd)
 163                 {
 164         case BIO_C_DO_STATE_MACHINE:
 165                 BIO_clear_retry_flags(b);
 166                 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
 167                 BIO_copy_next_retry(b);
 168                 break;
 169         case BIO_CTRL_DUP:
 170                 ret=0L;
 171                 break;
 172         default:
 173                 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
 174                 }
 175         return(ret);
 176         }
 177
 178 static int nullf_gets(bp,buf,size)
 179 BIO *bp;
 180 char *buf;
 181 int size;
 182         {
 183         if (bp->next_bio == NULL) return(0);
 184         return(BIO_gets(bp->next_bio,buf,size));
 185         }
 186
 187
 188 static int nullf_puts(bp,str)
 189 BIO *bp;
 190 char *str;
 191         {
 192         if (bp->next_bio == NULL) return(0);
 193         return(BIO_puts(bp->next_bio,str));
 194         }
 195
 196