uuencode.c revision 295367 
1/* $OpenBSD: uuencode.c,v 1.28 2015/04/24 01:36:24 deraadt Exp $ */
2/*
3 * Copyright (c) 2000 Markus Friedl.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT 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 OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "includes.h"
27
28#include <sys/types.h>
29#include <netinet/in.h>
30#include <resolv.h>
31#include <stdio.h>
32#include <stdlib.h>
33
34#include "xmalloc.h"
35#include "uuencode.h"
36
37/*
38 * Encode binary 'src' of length 'srclength', writing base64-encoded text
39 * to 'target' of size 'targsize'. Will always nul-terminate 'target'.
40 * Returns the number of bytes stored in 'target' or -1 on error (inc.
41 * 'targsize' too small).
42 */
43int
44uuencode(const u_char *src, u_int srclength,
45    char *target, size_t targsize)
46{
47	return __b64_ntop(src, srclength, target, targsize);
48}
49
50/*
51 * Decode base64-encoded 'src' into buffer 'target' of 'targsize' bytes.
52 * Will skip leading and trailing whitespace. Returns the number of bytes
53 * stored in 'target' or -1 on error (inc. targsize too small).
54 */
55int
56uudecode(const char *src, u_char *target, size_t targsize)
57{
58	int len;
59	char *encoded, *p;
60
61	/* copy the 'readonly' source */
62	encoded = xstrdup(src);
63	/* skip whitespace and data */
64	for (p = encoded; *p == ' ' || *p == '\t'; p++)
65		;
66	for (; *p != '\0' && *p != ' ' && *p != '\t'; p++)
67		;
68	/* and remove trailing whitespace because __b64_pton needs this */
69	*p = '\0';
70	len = __b64_pton(encoded, target, targsize);
71	free(encoded);
72	return len;
73}
74
75void
76dump_base64(FILE *fp, const u_char *data, u_int len)
77{
78	char *buf;
79	int i, n;
80
81	if (len > 65536) {
82		fprintf(fp, "dump_base64: len > 65536\n");
83		return;
84	}
85	buf = xreallocarray(NULL, 2, len);
86	n = uuencode(data, len, buf, 2*len);
87	for (i = 0; i < n; i++) {
88		fprintf(fp, "%c", buf[i]);
89		if (i % 70 == 69)
90			fprintf(fp, "\n");
91	}
92	if (i % 70 != 69)
93		fprintf(fp, "\n");
94	free(buf);
95}
96