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/*
* Copyright (C) 2001 Sistina Software (UK) Limited.
*
* This file is released under the LGPL.
*/
#include "lib.h"
#include "uuid.h"
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <assert.h>
static unsigned char _c[] =
"0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
static int _built_inverse;
static unsigned char _inverse_c[256];
int lvid_create(union lvid *lvid, struct id *vgid)
{
memcpy(lvid->id, vgid, sizeof(*lvid->id));
id_create(&lvid->id[1]);
return 1;
}
int lvid_from_lvnum(union lvid *lvid, struct id *vgid, int lv_num)
{
int i;
memcpy(lvid->id, vgid, sizeof(*lvid->id));
for (i = ID_LEN; i; i--) {
lvid->id[1].uuid[i - 1] = _c[lv_num % (sizeof(_c) - 1)];
lv_num /= sizeof(_c) - 1;
}
lvid->s[sizeof(lvid->s) - 1] = '\0';
return 1;
}
int lvnum_from_lvid(union lvid *lvid)
{
int i, lv_num = 0;
unsigned char *c;
for (i = 0; i < ID_LEN; i++) {
lv_num *= sizeof(_c) - 1;
if ((c = strchr(_c, lvid->id[1].uuid[i])))
lv_num += (int) (c - _c);
}
return lv_num;
}
int id_create(struct id *id)
{
int random, i, len = sizeof(id->uuid);
memset(id->uuid, 0, len);
if ((random = open("/dev/urandom", O_RDONLY)) < 0) {
log_sys_error("open", "id_create");
return 0;
}
if (read(random, id->uuid, len) != len) {
log_sys_error("read", "id_create");
close(random);
return 0;
}
close(random);
for (i = 0; i < len; i++)
id->uuid[i] = _c[id->uuid[i] % (sizeof(_c) - 1)];
return 1;
}
/*
* The only validity check we have is that
* the uuid just contains characters from
* '_c'. A checksum would have been nice :(
*/
void _build_inverse(void)
{
char *ptr;
if (_built_inverse)
return;
memset(_inverse_c, 0, sizeof(_inverse_c));
for (ptr = _c; *ptr; ptr++)
_inverse_c[(int) *ptr] = (char) 0x1;
}
int id_valid(struct id *id)
{
int i;
_build_inverse();
for (i = 0; i < ID_LEN; i++)
if (!_inverse_c[id->uuid[i]]) {
log_err("UUID contains invalid character");
return 0;
}
return 1;
}
int id_equal(struct id *lhs, struct id *rhs)
{
return !memcmp(lhs->uuid, rhs->uuid, sizeof(lhs->uuid));
}
#define GROUPS (ID_LEN / 4)
int id_write_format(struct id *id, char *buffer, size_t size)
{
int i, tot;
static int group_size[] = { 6, 4, 4, 4, 4, 4, 6 };
assert(ID_LEN == 32);
/* split into groups seperated by dashes */
if (size < (32 + 6 + 1)) {
log_err("Couldn't write uuid, buffer too small.");
return 0;
}
for (i = 0, tot = 0; i < 7; i++) {
memcpy(buffer, id->uuid + tot, group_size[i]);
buffer += group_size[i];
tot += group_size[i];
*buffer++ = '-';
}
*--buffer = '\0';
return 1;
}
int id_read_format(struct id *id, char *buffer)
{
int out = 0;
/* just strip out any dashes */
while (*buffer) {
if (*buffer == '-') {
buffer++;
continue;
}
if (out >= ID_LEN) {
log_err("Too many characters to be uuid.");
return 0;
}
id->uuid[out++] = *buffer++;
}
if (out != ID_LEN) {
log_err("Couldn't read uuid, incorrect number of characters.");
return 0;
}
return id_valid(id);
}
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