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