/src/samba/third_party/heimdal/lib/roken/hex.c
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1 | | /* |
2 | | * Copyright (c) 2004-2005 Kungliga Tekniska Högskolan |
3 | | * (Royal Institute of Technology, Stockholm, Sweden). |
4 | | * All rights reserved. |
5 | | * |
6 | | * Redistribution and use in source and binary forms, with or without |
7 | | * modification, are permitted provided that the following conditions |
8 | | * are met: |
9 | | * |
10 | | * 1. Redistributions of source code must retain the above copyright |
11 | | * notice, this list of conditions and the following disclaimer. |
12 | | * |
13 | | * 2. Redistributions in binary form must reproduce the above copyright |
14 | | * notice, this list of conditions and the following disclaimer in the |
15 | | * documentation and/or other materials provided with the distribution. |
16 | | * |
17 | | * 3. Neither the name of the Institute nor the names of its contributors |
18 | | * may be used to endorse or promote products derived from this software |
19 | | * without specific prior written permission. |
20 | | * |
21 | | * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND |
22 | | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
23 | | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
24 | | * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE |
25 | | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
26 | | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
27 | | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
28 | | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
29 | | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
30 | | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
31 | | * SUCH DAMAGE. |
32 | | */ |
33 | | |
34 | | |
35 | | #include <config.h> |
36 | | #include "roken.h" |
37 | | #include <ctype.h> |
38 | | #include "hex.h" |
39 | | |
40 | | static const char hexchar[16] = "0123456789ABCDEF"; |
41 | | |
42 | | static inline int |
43 | | pos(char c) |
44 | 0 | { |
45 | 0 | if (c >= '0' && c <= '9') |
46 | 0 | return c - '0'; |
47 | 0 | if (c >= 'A' && c <= 'F') |
48 | 0 | return 10 + c - 'A'; |
49 | 0 | if (c >= 'a' && c <= 'f') |
50 | 0 | return 10 + c - 'a'; |
51 | 0 | return -1; |
52 | 0 | } |
53 | | |
54 | | ROKEN_LIB_FUNCTION ssize_t ROKEN_LIB_CALL |
55 | | hex_encode(const void *data, size_t size, char **str) |
56 | 0 | { |
57 | 0 | const unsigned char *q = data; |
58 | 0 | size_t i; |
59 | 0 | char *p; |
60 | |
|
61 | 0 | p = calloc(size + 1, 2); |
62 | 0 | if (p == NULL) { |
63 | 0 | *str = NULL; |
64 | 0 | return -1; |
65 | 0 | } |
66 | | |
67 | 0 | for (i = 0; i < size; i++) { |
68 | 0 | p[i * 2] = hexchar[(*q >> 4) & 0xf]; |
69 | 0 | p[i * 2 + 1] = hexchar[*q & 0xf]; |
70 | 0 | q++; |
71 | 0 | } |
72 | 0 | p[i * 2] = '\0'; |
73 | 0 | *str = p; |
74 | |
|
75 | 0 | return i * 2; |
76 | 0 | } |
77 | | |
78 | | ROKEN_LIB_FUNCTION ssize_t ROKEN_LIB_CALL |
79 | | hex_decode(const char *str, void *data, size_t len) |
80 | 0 | { |
81 | 0 | size_t l; |
82 | 0 | unsigned char *p = data; |
83 | 0 | size_t i; |
84 | 0 | int d; |
85 | |
|
86 | 0 | l = strlen(str); |
87 | | |
88 | | /* check for overflow, same as (l+1)/2 but overflow safe */ |
89 | 0 | if ((l/2) + (l&1) > len) |
90 | 0 | return -1; |
91 | | |
92 | 0 | if (l & 1) { |
93 | 0 | if ((d = pos(str[0])) == -1) |
94 | 0 | return -1; |
95 | 0 | p[0] = d; |
96 | 0 | str++; |
97 | 0 | p++; |
98 | 0 | } |
99 | 0 | for (i = 0; i < l / 2; i++) { |
100 | 0 | if ((d = pos(str[i * 2])) == -1) |
101 | 0 | return -1; |
102 | 0 | p[i] = d << 4; |
103 | 0 | if ((d = pos(str[(i * 2) + 1])) == -1) |
104 | 0 | return -1; |
105 | 0 | p[i] |= d; |
106 | 0 | } |
107 | 0 | return i + (l & 1); |
108 | 0 | } |