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/*
* 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%
* This file may be redistributed under the terms of the GNU
* Library General Public License.
* %End-Header%
*/
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/time.h>
#include <time.h>
#include "uuidP.h"
time_t uuid_time(const uuid_t uu, struct timeval *ret_tv)
{
struct uuid uuid;
__u32 high;
struct timeval tv;
unsigned longlong clock_reg;
uuid_unpack(uu, &uuid);
high = uuid.time_mid | ((uuid.time_hi_and_version & 0xFFF) << 16);
clock_reg = uuid.time_low | ((unsigned longlong) high << 32);
clock_reg -= (((unsigned longlong) 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 DEBUG
static 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";
}
}
int
main(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:
printf("\n");
}
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
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