/* vi: set sw=4 ts=4: *//* * uuid_time.c --- Interpret the time field from a uuid.  This program *	violates the UUID abstraction barrier by reaching into the guts *	of a UUID and interpreting it. * * Copyright (C) 1998, 1999 Theodore Ts'o. * * %Begin-Header% * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright *    notice, and the entire permission notice in its entirety, *    including the disclaimer of warranties. * 2. Redistributions in binary form must reproduce the above copyright *    notice, this list of conditions and the following disclaimer in the *    documentation and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote *    products derived from this software without specific prior *    written permission. * * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ALL OF * WHICH ARE HEREBY DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE * USE OF THIS SOFTWARE, EVEN IF NOT ADVISED OF THE POSSIBILITY OF SUCH * DAMAGE. * %End-Header% */#include <stdio.h>#include <unistd.h>#include <stdlib.h>#include <sys/types.h>#include <time.h>#include "uuidP.h"time_t uuid_time(const uuid_t uu, struct timeval *ret_tv){	struct uuid		uuid;	uint32_t			high;	struct timeval		tv;	unsigned long long	clock_reg;	uuid_unpack(uu, &uuid);	high = uuid.time_mid | ((uuid.time_hi_and_version & 0xFFF) << 16);	clock_reg = uuid.time_low | ((unsigned long long) high << 32);	clock_reg -= (((unsigned long long) 0x01B21DD2) << 32) + 0x13814000;	tv.tv_sec = clock_reg / 10000000;	tv.tv_usec = (clock_reg % 10000000) / 10;	if (ret_tv)		*ret_tv = tv;	return tv.tv_sec;}int uuid_type(const uuid_t uu){	struct uuid		uuid;	uuid_unpack(uu, &uuid);	return ((uuid.time_hi_and_version >> 12) & 0xF);}int uuid_variant(const uuid_t uu){	struct uuid		uuid;	int			var;	uuid_unpack(uu, &uuid);	var = uuid.clock_seq;	if ((var & 0x8000) == 0)		return UUID_VARIANT_NCS;	if ((var & 0x4000) == 0)		return UUID_VARIANT_DCE;	if ((var & 0x2000) == 0)		return UUID_VARIANT_MICROSOFT;	return UUID_VARIANT_OTHER;}#ifdef DEBUGstatic const char *variant_string(int variant){	switch (variant) {	case UUID_VARIANT_NCS:		return "NCS";	case UUID_VARIANT_DCE:		return "DCE";	case UUID_VARIANT_MICROSOFT:		return "Microsoft";	default:		return "Other";	}}intmain(int argc, char **argv){	uuid_t		buf;	time_t		time_reg;	struct timeval	tv;	int		type, variant;	if (argc != 2) {		fprintf(stderr, "Usage: %s uuid\n", argv[0]);		exit(1);	}	if (uuid_parse(argv[1], buf)) {		fprintf(stderr, "Invalid UUID: %s\n", argv[1]);		exit(1);	}	variant = uuid_variant(buf);	type = uuid_type(buf);	time_reg = uuid_time(buf, &tv);	printf("UUID variant is %d (%s)\n", variant, variant_string(variant));	if (variant != UUID_VARIANT_DCE) {		printf("Warning: This program only knows how to interpret "		       "DCE UUIDs.\n\tThe rest of the output is likely "		       "to be incorrect!!\n");	}	printf("UUID type is %d", type);	switch (type) {	case 1:		printf(" (time based)\n");		break;	case 2:		printf(" (DCE)\n");		break;	case 3:		printf(" (name-based)\n");		break;	case 4:		printf(" (random)\n");		break;	default:		puts("");	}	if (type != 1) {		printf("Warning: not a time-based UUID, so UUID time "		       "decoding will likely not work!\n");	}	printf("UUID time is: (%ld, %ld): %s\n", tv.tv_sec, tv.tv_usec,	       ctime(&time_reg));	return 0;}#endif