1/*-
2 * Copyright (c) 2017-2018, Juniper Networks, Inc.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
14 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
15 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
16 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
17 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
18 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
19 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25#include <sys/cdefs.h>
26#include <libsecureboot.h>
27
28unsigned char *
29read_fd(int fd, size_t len)
30{
31	int m, n, x;
32	unsigned char *buf;
33
34	buf = malloc(len + 1);
35	if (buf != NULL) {
36		for (x = 0, m = len; m > 0; ) {
37			n = read(fd, &buf[x], m);
38			if (n < 0)
39				break;
40			if (n > 0) {
41				m -= n;
42				x += n;
43			}
44		}
45		if (m == 0) {
46			buf[len] = '\0';
47			return (buf);
48		}
49		free(buf);
50	}
51	return (NULL);
52}
53
54unsigned char *
55read_file(const char *path, size_t *len)
56{
57	struct stat st;
58	unsigned char *ucp;
59	int fd;
60
61    	if (len)
62		*len = 0;
63	if ((fd = open(path, O_RDONLY)) < 0)
64		return (NULL);
65	fstat(fd, &st);
66	ucp = read_fd(fd, st.st_size);
67	close(fd);
68	if (ucp != NULL) {
69		if (len != NULL)
70			*len = st.st_size;
71	}
72#ifdef _STANDALONE
73	else
74		printf("%s: out of memory! %lu\n", __func__,
75		    (unsigned long)len);
76#endif
77
78	return (ucp);
79}
80
81