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// Copyright (C) 2010 David Sugar, Tycho Softworks.
//
// This file is part of GNU uCommon C++.
//
// GNU uCommon C++ is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// GNU uCommon C++ 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 Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with GNU uCommon C++. If not, see <http://www.gnu.org/licenses/>.
#include "local.h"
#ifndef _MSWINDOWS_
#include <fcntl.h>
#endif
void Random::seed(void)
{
time_t now;
time(&now);
srand((int)now);
}
bool Random::seed(const unsigned char *buf, size_t size)
{
#ifdef _MSWINDOWS_
return false;
#else
int fd = open("/dev/random", O_WRONLY);
bool result = false;
if(fd > -1) {
if(write(fd, buf, size) > 0)
result = true;
close(fd);
}
return result;
#endif
}
size_t Random::key(unsigned char *buf, size_t size)
{
#ifdef _MSWINDOWS_
if(_handle != NULL && CryptGenRandom(_handle, size, buf))
return size;
return 0;
#else
int fd = open("/dev/random", O_RDONLY);
ssize_t result = 0;
if(fd > -1) {
result = read(fd, buf, size);
close(fd);
}
if(result < 0)
result = 0;
return (size_t)result;
#endif
}
size_t Random::fill(unsigned char *buf, size_t size)
{
#ifdef _MSWINDOWS_
return key(buf, size);
#else
int fd = open("/dev/urandom", O_RDONLY);
ssize_t result = 0;
if(fd > -1) {
result = read(fd, buf, size);
close(fd);
}
// ugly...would not trust it
else {
result = 0;
while(result++ < (ssize_t)size)
*(buf++) = rand() & 0xff;
}
if(result < 0)
result = 0;
return (size_t)result;
#endif
}
int Random::get(void)
{
uint16_t v;;
fill((unsigned char *)&v, sizeof(v));
v /= 2;
return (int)v;
}
int Random::get(int min, int max)
{
unsigned rand;
int range = max - min + 1;
unsigned umax;
if(max < min)
return 0;
memset(&umax, 0xff, sizeof(umax));
do {
fill((unsigned char *)&rand, sizeof(rand));
} while(rand > umax - (umax % range));
return min + (rand % range);
}
double Random::real(void)
{
unsigned umax;
unsigned rand;
memset(&umax, 0xff, sizeof(umax));
fill((unsigned char *)&rand, sizeof(rand));
return ((double)rand) / ((double)umax);
}
double Random::real(double min, double max)
{
return real() * (max - min) + min;
}
bool Random::status(void)
{
#ifdef _MSWINDOWS_
return true;
#else
if(fsys::isfile("/dev/random"))
return true;
return false;
#endif
}
void Random::uuid(char *str)
{
unsigned char buf[16];
fill(buf, sizeof(buf));
buf[6] &= 0x0f;
buf[6] |= 0x40;
buf[8] &= 0x3f;
buf[8] |= 0x80;
String::hexdump(buf, str, "4-2-2-2-6");
}
String Random::uuid(void)
{
char buf[38];
uuid(buf);
return String(buf);
}
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