2 * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (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
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 = {
38 const BIO_METHOD *BIO_f_null(void)
40 return (&methods_nullf);
43 static int nullf_read(BIO *b, char *out, int outl)
49 if (b->next_bio == NULL)
51 ret = BIO_read(b->next_bio, out, outl);
52 BIO_clear_retry_flags(b);
53 BIO_copy_next_retry(b);
57 static int nullf_write(BIO *b, const char *in, int inl)
61 if ((in == NULL) || (inl <= 0))
63 if (b->next_bio == NULL)
65 ret = BIO_write(b->next_bio, in, inl);
66 BIO_clear_retry_flags(b);
67 BIO_copy_next_retry(b);
71 static long nullf_ctrl(BIO *b, int cmd, long num, void *ptr)
75 if (b->next_bio == NULL)
78 case BIO_C_DO_STATE_MACHINE:
79 BIO_clear_retry_flags(b);
80 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
81 BIO_copy_next_retry(b);
87 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
92 static long nullf_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp)
96 if (b->next_bio == NULL)
100 ret = BIO_callback_ctrl(b->next_bio, cmd, fp);
106 static int nullf_gets(BIO *bp, char *buf, int size)
108 if (bp->next_bio == NULL)
110 return (BIO_gets(bp->next_bio, buf, size));
113 static int nullf_puts(BIO *bp, const char *str)
115 if (bp->next_bio == NULL)
117 return (BIO_puts(bp->next_bio, str));