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id128: move make_v4_uuid into id128-util.h to make it generally useful

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This commit is contained in:
Lennart Poettering 2019-12-10 11:32:59 +01:00
parent 449d530700
commit 1293a168f1
3 changed files with 17 additions and 15 deletions
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13
src/libsystemd/sd-id128/id128-util.c
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@ -190,4 +190,17 @@ int id128_compare_func(const sd_id128_t *a, const sd_id128_t *b) {
return memcmp(a, b, 16); return memcmp(a, b, 16);
} }
sd_id128_t id128_make_v4_uuid(sd_id128_t id) {
/* Stolen from generate_random_uuid() of drivers/char/random.c
* in the kernel sources */
/* Set UUID version to 4 --- truly random generation */
id.bytes[6] = (id.bytes[6] & 0x0F) | 0x40;
/* Set the UUID variant to DCE */
id.bytes[8] = (id.bytes[8] & 0x3F) | 0x80;
return id;
}
DEFINE_HASH_OPS(id128_hash_ops, sd_id128_t, id128_hash_func, id128_compare_func); DEFINE_HASH_OPS(id128_hash_ops, sd_id128_t, id128_hash_func, id128_compare_func);

2
src/libsystemd/sd-id128/id128-util.h
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@ -30,3 +30,5 @@ int id128_write(const char *p, Id128Format f, sd_id128_t id, bool do_sync);
void id128_hash_func(const sd_id128_t *p, struct siphash *state); void id128_hash_func(const sd_id128_t *p, struct siphash *state);
int id128_compare_func(const sd_id128_t *a, const sd_id128_t *b) _pure_; int id128_compare_func(const sd_id128_t *a, const sd_id128_t *b) _pure_;
extern const struct hash_ops id128_hash_ops; extern const struct hash_ops id128_hash_ops;
sd_id128_t id128_make_v4_uuid(sd_id128_t id);

17
src/libsystemd/sd-id128/sd-id128.c
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@ -250,19 +250,6 @@ _public_ int sd_id128_get_invocation(sd_id128_t *ret) {
return 0; return 0;
} }
static sd_id128_t make_v4_uuid(sd_id128_t id) {
/* Stolen from generate_random_uuid() of drivers/char/random.c
* in the kernel sources */
/* Set UUID version to 4 --- truly random generation */
id.bytes[6] = (id.bytes[6] & 0x0F) | 0x40;
/* Set the UUID variant to DCE */
id.bytes[8] = (id.bytes[8] & 0x3F) | 0x80;
return id;
}
_public_ int sd_id128_randomize(sd_id128_t *ret) { _public_ int sd_id128_randomize(sd_id128_t *ret) {
sd_id128_t t; sd_id128_t t;
int r; int r;
@ -279,7 +266,7 @@ _public_ int sd_id128_randomize(sd_id128_t *ret) {
* only guarantee this for newly generated UUIDs, not for * only guarantee this for newly generated UUIDs, not for
* pre-existing ones. */ * pre-existing ones. */
*ret = make_v4_uuid(t); *ret = id128_make_v4_uuid(t);
return 0; return 0;
} }
@ -306,7 +293,7 @@ static int get_app_specific(sd_id128_t base, sd_id128_t app_id, sd_id128_t *ret)
/* We chop off the trailing 16 bytes */ /* We chop off the trailing 16 bytes */
memcpy(&result, p, MIN(khash_get_size(h), sizeof(result))); memcpy(&result, p, MIN(khash_get_size(h), sizeof(result)));
*ret = make_v4_uuid(result); *ret = id128_make_v4_uuid(result);
return 0; return 0;
} }