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- /*
- utils.c -- gathering of some stupid small functions
- Copyright (C) 1999-2005 Ivo Timmermans
- 2000-2014 Guus Sliepen <guus@tinc-vpn.org>
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
- You should have received a copy of the GNU General Public License along
- with this program; if not, write to the Free Software Foundation, Inc.,
- 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- */
- #include "system.h"
- #include "../src/logger.h"
- #include "utils.h"
- static const char hexadecimals[] = "0123456789ABCDEF";
- static int charhex2bin(char c) {
- if(isdigit(c)) {
- return c - '0';
- } else {
- return toupper(c) - 'A' + 10;
- }
- }
- bool hex2bin(char *src, char *dst, int length) {
- for(int i = 0; i < length; i++) {
- if(!isxdigit(src[i * 2]) || !isxdigit(src[i * 2 + 1])) {
- return false;
- }
- dst[i] = charhex2bin(src[i * 2]) * 16 + charhex2bin(src[i * 2 + 1]);
- }
- return true;
- }
- void bin2hex(char *src, char *dst, int length) {
- int i;
- for(i = length - 1; i >= 0; i--) {
- dst[i * 2 + 1] = hexadecimals[(unsigned char) src[i] & 15];
- dst[i * 2] = hexadecimals[(unsigned char) src[i] >> 4];
- }
- }
- #if defined(HAVE_MINGW) || defined(HAVE_CYGWIN)
- #ifdef HAVE_CYGWIN
- #include <w32api/windows.h>
- #endif
- const char *winerror(int err) {
- static char buf[1024], *ptr;
- ptr = buf + sprintf(buf, "(%d) ", err);
- if(!FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
- NULL, err, MAKELANGID(LANG_NEUTRAL, SUBLANG_NEUTRAL), ptr, sizeof(buf) - (ptr - buf), NULL)) {
- strcpy(ptr, "(unable to format errormessage)");
- };
- if((ptr = strchr(buf, '\r'))) {
- *ptr = '\0';
- }
- return buf;
- }
- #endif
- unsigned int bitfield_to_int(const void *bitfield, size_t size) {
- unsigned int value = 0;
- if(size > sizeof(value)) {
- size = sizeof(value);
- }
- memcpy(&value, bitfield, size);
- return value;
- }
- /**
- * As memcmp(), but constant-time.
- * Returns 0 when data is equal, non-zero otherwise.
- */
- int memcmp_constant_time(const void *a, const void *b, size_t size) {
- const uint8_t *a1 = a, *b1 = b;
- int ret = 0;
- size_t i;
- for(i = 0; i < size; i++) {
- ret |= *a1++ ^ *b1++;
- }
- return ret;
- }
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