1 /* 2 * uuid.c -- utility routines for manipulating UUID's. 3 * 4 * %Begin-Header% 5 * This file may be redistributed under the terms of the GNU Library 6 * General Public License, version 2. 7 * %End-Header% 8 */ 9 10 #include "config.h" 11 #include <stdio.h> 12 #include <string.h> 13 #include <ext2fs/ext2_types.h> 14 15 #include "e2p.h" 16 17 struct uuid { 18 __u32 time_low; 19 __u16 time_mid; 20 __u16 time_hi_and_version; 21 __u16 clock_seq; 22 __u8 node[6]; 23 }; 24 25 /* Returns 1 if the uuid is the NULL uuid */ 26 int e2p_is_null_uuid(void *uu) 27 { 28 __u8 *cp; 29 int i; 30 31 for (i=0, cp = uu; i < 16; i++) 32 if (*cp++) 33 return 0; 34 return 1; 35 } 36 37 static void e2p_unpack_uuid(void *in, struct uuid *uu) 38 { 39 __u8 *ptr = in; 40 __u32 tmp; 41 42 tmp = *ptr++; 43 tmp = (tmp << 8) | *ptr++; 44 tmp = (tmp << 8) | *ptr++; 45 tmp = (tmp << 8) | *ptr++; 46 uu->time_low = tmp; 47 48 tmp = *ptr++; 49 tmp = (tmp << 8) | *ptr++; 50 uu->time_mid = tmp; 51 52 tmp = *ptr++; 53 tmp = (tmp << 8) | *ptr++; 54 uu->time_hi_and_version = tmp; 55 56 tmp = *ptr++; 57 tmp = (tmp << 8) | *ptr++; 58 uu->clock_seq = tmp; 59 60 memcpy(uu->node, ptr, 6); 61 } 62 63 void e2p_uuid_to_str(void *uu, char *out) 64 { 65 struct uuid uuid; 66 67 e2p_unpack_uuid(uu, &uuid); 68 sprintf(out, 69 "%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x", 70 uuid.time_low, uuid.time_mid, uuid.time_hi_and_version, 71 uuid.clock_seq >> 8, uuid.clock_seq & 0xFF, 72 uuid.node[0], uuid.node[1], uuid.node[2], 73 uuid.node[3], uuid.node[4], uuid.node[5]); 74 } 75 76 const char *e2p_uuid2str(void *uu) 77 { 78 static char buf[80]; 79 80 if (e2p_is_null_uuid(uu)) 81 return "<none>"; 82 e2p_uuid_to_str(uu, buf); 83 return buf; 84 } 85 86
