/*
 *	PROGRAM:	JRD Access Method
 *	MODULE:		guid.cpp
 *	DESCRIPTION:	Portable GUID (posix)
 *
 *  The contents of this file are subject to the Initial
 *  Developer's Public License Version 1.0 (the "License");
 *  you may not use this file except in compliance with the
 *  License. You may obtain a copy of the License at
 *  http://www.ibphoenix.com/main.nfs?a=ibphoenix&page=ibp_idpl.
 *
 *  Software distributed under the License is distributed AS IS,
 *  WITHOUT WARRANTY OF ANY KIND, either express or implied.
 *  See the License for the specific language governing rights
 *  and limitations under the License.
 *
 *  The Original Code was created by Nickolay Samofatov
 *  for the Firebird Open Source RDBMS project.
 *
 *  Copyright (c) 2004 Nickolay Samofatov <nickolay@broadviewsoftware.com>
 *  and all contributors signed below.
 *
 *  All Rights Reserved.
 *  Contributor(s): ______________________________________.
 *
 *
 *  $Id: guid.cpp,v 1.8 2005-05-27 22:44:32 asfernandes Exp $
 *
 */

#include "../jrd/os/guid.h"

#include "firebird.h"
#include "fb_exception.h"
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>

void GenerateRandomBytes(void* buffer, size_t size)
{
	// do not use /dev/random because it may return lesser data than we need.
	int fd = open("/dev/urandom", O_RDONLY);
	if (fd < 0)
		Firebird::system_call_failed::raise("open");
	if (read(fd, buffer, size) != static_cast<int>(size))
		Firebird::system_call_failed::raise("read");
	close(fd);
}

void GenerateGuid(FB_GUID* guid) {
	GenerateRandomBytes(guid, sizeof(FB_GUID));
}

void GuidToString(char* buffer, const FB_GUID* guid) {
	sprintf(buffer, "{%04hX%04hX-%04hX-%04hX-%04hX-%04hX%04hX%04hX}", 
		guid->data[0], guid->data[1], guid->data[2], guid->data[3],
		guid->data[4], guid->data[5], guid->data[6], guid->data[7]);
}

void StringToGuid(FB_GUID* guid, const char* buffer) {
	sscanf(buffer, "{%04hX%04hX-%04hX-%04hX-%04hX-%04hX%04hX%04hX}", 
		&guid->data[0], &guid->data[1], &guid->data[2], &guid->data[3],
		&guid->data[4], &guid->data[5], &guid->data[6], &guid->data[7]);
}