2 utils.c -- gathering of some stupid small functions
3 Copyright (C) 1999-2005 Ivo Timmermans
4 2000-2009 Guus Sliepen <guus@tinc-vpn.org>
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License along
17 with this program; if not, write to the Free Software Foundation, Inc.,
18 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
23 #include "../src/logger.h"
26 static const char hexadecimals[] = "0123456789ABCDEF";
27 static const char base64imals[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
29 static int charhex2bin(char c) {
33 return toupper(c) - 'A' + 10;
36 static int charb64decode(char c) {
49 int hex2bin(const char *src, char *dst, int length) {
51 for(i = 0; i < length && isxdigit(src[i * 2]) && isxdigit(src[i * 2 + 1]); i++)
52 dst[i] = charhex2bin(src[i * 2]) * 16 + charhex2bin(src[i * 2 + 1]);
56 int bin2hex(const char *src, char *dst, int length) {
57 for(int i = length - 1; i >= 0; i--) {
58 dst[i * 2 + 1] = hexadecimals[(unsigned char) src[i] & 15];
59 dst[i * 2] = hexadecimals[(unsigned char) src[i] >> 4];
65 int b64decode(const char *src, char *dst, int length) {
68 unsigned char *udst = (unsigned char *)dst;
70 for(i = 0; i < length / 3 * 4 && src[i]; i++) {
71 triplet |= charb64decode(src[i]) << (6 * (i & 3));
73 udst[0] = triplet & 0xff; triplet >>= 8;
74 udst[1] = triplet & 0xff; triplet >>= 8;
81 udst[0] = triplet & 0xff; triplet >>= 8;
82 udst[1] = triplet & 0xff;
84 } else if((i & 3) == 2) {
85 udst[0] = triplet & 0xff;
92 int b64encode(const char *src, char *dst, int length) {
94 const unsigned char *usrc = (unsigned char *)src;
95 int si = length / 3 * 3;
96 int di = length / 3 * 4;
100 triplet = usrc[si] | usrc[si + 1] << 8;
101 dst[di] = base64imals[triplet & 63]; triplet >>= 6;
102 dst[di + 1] = base64imals[triplet & 63]; triplet >>= 6;
103 dst[di + 2] = base64imals[triplet];
109 dst[di] = base64imals[triplet & 63]; triplet >>= 6;
110 dst[di + 1] = base64imals[triplet];
123 triplet = usrc[si] | usrc[si + 1] << 8 | usrc[si + 2] << 16;
124 dst[di] = base64imals[triplet & 63]; triplet >>= 6;
125 dst[di + 1] = base64imals[triplet & 63]; triplet >>= 6;
126 dst[di + 2] = base64imals[triplet & 63]; triplet >>= 6;
127 dst[di + 3] = base64imals[triplet];
133 #if defined(HAVE_MINGW) || defined(HAVE_CYGWIN)
135 #include <w32api/windows.h>
138 const char *winerror(int err) {
139 static char buf[1024], *ptr;
141 ptr = buf + sprintf(buf, "(%d) ", err);
143 if (!FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
144 NULL, err, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), ptr, sizeof(buf) - (ptr - buf), NULL)) {
145 strncpy(buf, "(unable to format errormessage)", sizeof(buf));
148 if((ptr = strchr(buf, '\r')))
155 unsigned int bitfield_to_int(const void *bitfield, size_t size) {
156 unsigned int value = 0;
157 if(size > sizeof value)
159 memcpy(&value, bitfield, size);