[3320] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * uuid.c -- utility routines for manipulating UUID's.
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| 4 | */
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| 5 |
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| 6 | #include <stdio.h>
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| 7 | #include <string.h>
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| 8 | #include "../ext2fs/ext2_types.h"
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| 9 |
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| 10 | #include "e2p.h"
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| 11 |
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| 12 | struct uuid {
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| 13 | __u32 time_low;
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| 14 | __u16 time_mid;
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| 15 | __u16 time_hi_and_version;
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| 16 | __u16 clock_seq;
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| 17 | __u8 node[6];
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| 18 | };
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| 19 |
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| 20 | /* Returns 1 if the uuid is the NULL uuid */
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| 21 | int e2p_is_null_uuid(void *uu)
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| 22 | {
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| 23 | __u8 *cp;
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| 24 | int i;
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| 25 |
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| 26 | for (i=0, cp = uu; i < 16; i++)
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| 27 | if (*cp)
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| 28 | return 0;
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| 29 | return 1;
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| 30 | }
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| 31 |
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| 32 | static void e2p_unpack_uuid(void *in, struct uuid *uu)
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| 33 | {
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| 34 | __u8 *ptr = in;
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| 35 | __u32 tmp;
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| 36 |
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| 37 | tmp = *ptr++;
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| 38 | tmp = (tmp << 8) | *ptr++;
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| 39 | tmp = (tmp << 8) | *ptr++;
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| 40 | tmp = (tmp << 8) | *ptr++;
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| 41 | uu->time_low = tmp;
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| 42 |
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| 43 | tmp = *ptr++;
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| 44 | tmp = (tmp << 8) | *ptr++;
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| 45 | uu->time_mid = tmp;
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| 46 |
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| 47 | tmp = *ptr++;
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| 48 | tmp = (tmp << 8) | *ptr++;
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| 49 | uu->time_hi_and_version = tmp;
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| 50 |
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| 51 | tmp = *ptr++;
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| 52 | tmp = (tmp << 8) | *ptr++;
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| 53 | uu->clock_seq = tmp;
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| 54 |
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| 55 | memcpy(uu->node, ptr, 6);
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| 56 | }
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| 57 |
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| 58 | void e2p_uuid_to_str(void *uu, char *out)
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| 59 | {
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| 60 | struct uuid uuid;
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| 61 |
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| 62 | e2p_unpack_uuid(uu, &uuid);
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| 63 | sprintf(out,
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| 64 | "%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
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| 65 | uuid.time_low, uuid.time_mid, uuid.time_hi_and_version,
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| 66 | uuid.clock_seq >> 8, uuid.clock_seq & 0xFF,
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| 67 | uuid.node[0], uuid.node[1], uuid.node[2],
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| 68 | uuid.node[3], uuid.node[4], uuid.node[5]);
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| 69 | }
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| 70 |
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| 71 | const char *e2p_uuid2str(void *uu)
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| 72 | {
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| 73 | static char buf[80];
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| 74 | if (e2p_is_null_uuid(uu))
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| 75 | return "<none>";
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| 76 | e2p_uuid_to_str(uu, buf);
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| 77 | return buf;
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| 78 | }
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