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