bf_null.c
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/*
* Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <stdio.h>
#include <errno.h>
#include "bio_lcl.h"
#include "internal/cryptlib.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 long nullf_callback_ctrl(BIO *h, int cmd, BIO_info_cb *fp);
static const BIO_METHOD methods_nullf = {
BIO_TYPE_NULL_FILTER,
"NULL filter",
/* TODO: Convert to new style write function */
bwrite_conv,
nullf_write,
/* TODO: Convert to new style read function */
bread_conv,
nullf_read,
nullf_puts,
nullf_gets,
nullf_ctrl,
NULL,
NULL,
nullf_callback_ctrl,
};
const BIO_METHOD *BIO_f_null(void)
{
return &methods_nullf;
}
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);
}