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/* crypto/bio/bf_null.c */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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#include <openssl/bio.h>
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/* BIO_put and BIO_get both add to the digest,
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* BIO_gets returns the digest */
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static int nullf_write(BIO *h, const char *buf, int num);
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static int nullf_read(BIO *h, char *buf, int size);
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static int nullf_puts(BIO *h, const char *str);
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static int nullf_gets(BIO *h, char *str, int size);
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static long nullf_ctrl(BIO *h, int cmd, long arg1, void *arg2);
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static int nullf_new(BIO *h);
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static int nullf_free(BIO *data);
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static long nullf_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp);
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static BIO_METHOD methods_nullf=
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BIO_METHOD *BIO_f_null(void)
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return(&methods_nullf);
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static int nullf_new(BIO *bi)
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static int nullf_free(BIO *a)
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if (a == NULL) return(0);
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static int nullf_read(BIO *b, char *out, int outl)
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if (out == NULL) return(0);
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if (b->next_bio == NULL) return(0);
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ret=BIO_read(b->next_bio,out,outl);
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BIO_clear_retry_flags(b);
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BIO_copy_next_retry(b);
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static int nullf_write(BIO *b, const char *in, int inl)
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if ((in == NULL) || (inl <= 0)) return(0);
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if (b->next_bio == NULL) return(0);
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ret=BIO_write(b->next_bio,in,inl);
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BIO_clear_retry_flags(b);
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BIO_copy_next_retry(b);
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static long nullf_ctrl(BIO *b, int cmd, long num, void *ptr)
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if (b->next_bio == NULL) return(0);
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case BIO_C_DO_STATE_MACHINE:
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BIO_clear_retry_flags(b);
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ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
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BIO_copy_next_retry(b);
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ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
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static long nullf_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
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if (b->next_bio == NULL) return(0);
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ret=BIO_callback_ctrl(b->next_bio,cmd,fp);
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static int nullf_gets(BIO *bp, char *buf, int size)
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if (bp->next_bio == NULL) return(0);
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return(BIO_gets(bp->next_bio,buf,size));
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static int nullf_puts(BIO *bp, const char *str)
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if (bp->next_bio == NULL) return(0);
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return(BIO_puts(bp->next_bio,str));