1 /*
2 * Copyright (c) 2018 Yubico AB. All rights reserved.
3 * Use of this source code is governed by a BSD-style
4 * license that can be found in the LICENSE file.
5 */
6
7 #include "fido.h"
8
9 int
fido_buf_read(const unsigned char ** buf,size_t * len,void * dst,size_t count)10 fido_buf_read(const unsigned char **buf, size_t *len, void *dst, size_t count)
11 {
12 if (count > *len)
13 return (-1);
14
15 memcpy(dst, *buf, count);
16 *buf += count;
17 *len -= count;
18
19 return (0);
20 }
21
22 int
fido_buf_write(unsigned char ** buf,size_t * len,const void * src,size_t count)23 fido_buf_write(unsigned char **buf, size_t *len, const void *src, size_t count)
24 {
25 if (count > *len)
26 return (-1);
27
28 memcpy(*buf, src, count);
29 *buf += count;
30 *len -= count;
31
32 return (0);
33 }
34