2 * Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
12 #include "bio_local.h"
13 #include "internal/cryptlib.h"
16 * BIO_put and BIO_get both add to the digest, BIO_gets returns the digest
19 static int nullf_write(BIO *h, const char *buf, int num);
20 static int nullf_read(BIO *h, char *buf, int size);
21 static int nullf_puts(BIO *h, const char *str);
22 static int nullf_gets(BIO *h, char *str, int size);
23 static long nullf_ctrl(BIO *h, int cmd, long arg1, void *arg2);
24 static long nullf_callback_ctrl(BIO *h, int cmd, BIO_info_cb *fp);
25 static const BIO_METHOD methods_nullf = {
40 const BIO_METHOD *BIO_f_null(void)
42 return &methods_nullf;
45 static int nullf_read(BIO *b, char *out, int outl)
51 if (b->next_bio == NULL)
53 ret = BIO_read(b->next_bio, out, outl);
54 BIO_clear_retry_flags(b);
55 BIO_copy_next_retry(b);
59 static int nullf_write(BIO *b, const char *in, int inl)
63 if ((in == NULL) || (inl <= 0))
65 if (b->next_bio == NULL)
67 ret = BIO_write(b->next_bio, in, inl);
68 BIO_clear_retry_flags(b);
69 BIO_copy_next_retry(b);
73 static long nullf_ctrl(BIO *b, int cmd, long num, void *ptr)
77 if (b->next_bio == NULL)
80 case BIO_C_DO_STATE_MACHINE:
81 BIO_clear_retry_flags(b);
82 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
83 BIO_copy_next_retry(b);
89 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
94 static long nullf_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp)
96 if (b->next_bio == NULL)
98 return BIO_callback_ctrl(b->next_bio, cmd, fp);
101 static int nullf_gets(BIO *bp, char *buf, int size)
103 if (bp->next_bio == NULL)
105 return BIO_gets(bp->next_bio, buf, size);
108 static int nullf_puts(BIO *bp, const char *str)
110 if (bp->next_bio == NULL)
112 return BIO_puts(bp->next_bio, str);