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