projects / apple / hfs.git / blame
| Commit | Line | Data |
|---|---|---|
| de8ee011 A |
1 | /* Copyright © 2017-2018 Apple Inc. All rights reserved. |
| 2 | * | |
| 3 | * lf_hfs_utils.c | |
| 4 | * livefiles_hfs | |
| 5 | * | |
| 6 | * Created by Yakov Ben Zaken on 19/03/2018. | |
| 7 | */ | |
| 8 | ||
| 9 | #include "lf_hfs_utils.h" | |
| 10 | #include "lf_hfs_vfsutils.h" | |
| 11 | ||
| 12 | /* | |
| 13 | * General routine to allocate a hash table. | |
| 14 | */ | |
| 15 | void * | |
| 16 | hashinit(int elements, u_long *hashmask) | |
| 17 | { | |
| 18 | int hashsize = 0; | |
| 19 | LIST_HEAD(generic, generic) *hashtbl; | |
| 20 | int i; | |
| 21 | ||
| 22 | if (elements <= 0) | |
| 23 | return NULL; | |
| 24 | for (hashsize = 1; hashsize <= elements; hashsize <<= 1) | |
| 25 | { | |
| 26 | continue; | |
| 27 | } | |
| 28 | ||
| 29 | hashsize >>= 1; | |
| 30 | hashtbl = hfs_malloc(hashsize * sizeof(*hashtbl)); | |
| 31 | if (hashtbl != NULL) | |
| 32 | { | |
| 33 | for (i = 0; i < hashsize; i++) | |
| 34 | { | |
| 35 | LIST_INIT(&hashtbl[i]); | |
| 36 | } | |
| 37 | *hashmask = hashsize - 1; | |
| 38 | } | |
| 39 | return (hashtbl); | |
| 40 | } | |
| 41 | ||
| 42 | /* | |
| 43 | * General routine to free a hash table. | |
| 44 | */ | |
| 45 | void | |
| 46 | hashDeinit(void* pvHashTbl) | |
| 47 | { | |
| 48 | LIST_HEAD(generic, generic) *hashtbl = pvHashTbl; | |
| 49 | hfs_free(hashtbl); | |
| 50 | } | |
| 51 | ||
| 52 | /* | |
| 53 | * to_bsd_time - convert from Mac OS time (seconds since 1/1/1904) | |
| 54 | * to BSD time (seconds since 1/1/1970) | |
| 55 | */ | |
| 56 | time_t | |
| 57 | to_bsd_time(u_int32_t hfs_time) | |
| 58 | { | |
| 59 | u_int32_t gmt = hfs_time; | |
| 60 | ||
| 61 | if (gmt > MAC_GMT_FACTOR) | |
| 62 | gmt -= MAC_GMT_FACTOR; | |
| 63 | else | |
| 64 | gmt = 0; /* don't let date go negative! */ | |
| 65 | ||
| 66 | return (time_t)gmt; | |
| 67 | } | |
| 68 | ||
| 69 | /* | |
| 70 | * to_hfs_time - convert from BSD time (seconds since 1/1/1970) | |
| 71 | * to Mac OS time (seconds since 1/1/1904) | |
| 72 | */ | |
| 73 | u_int32_t | |
| 74 | to_hfs_time(time_t bsd_time) | |
| 75 | { | |
| 76 | u_int32_t hfs_time = (u_int32_t)bsd_time; | |
| 77 | ||
| 78 | /* don't adjust zero - treat as uninitialzed */ | |
| 79 | if (hfs_time != 0) | |
| 80 | hfs_time += MAC_GMT_FACTOR; | |
| 81 | ||
| 82 | return (hfs_time); | |
| 83 | } | |
| 84 | ||
| 85 | void | |
| 86 | microuptime(struct timeval *tvp) | |
| 87 | { | |
| 88 | struct timespec ts; | |
| 89 | clock_gettime( CLOCK_MONOTONIC, &ts ); | |
| 90 | TIMESPEC_TO_TIMEVAL(tvp, &ts); | |
| 91 | } | |
| 92 | ||
| 93 | void | |
| 94 | microtime(struct timeval *tvp) | |
| 95 | { | |
| 96 | struct timespec ts; | |
| 97 | clock_gettime( CLOCK_REALTIME, &ts ); | |
| 98 | TIMESPEC_TO_TIMEVAL(tvp, &ts); | |
| 99 | } | |
| 100 | ||
| 101 | void* lf_hfs_utils_allocate_and_copy_string( char *pcName, size_t uLen ) | |
| 102 | { | |
| 103 | //Check the validity of the uLen | |
| 104 | if (uLen > kHFSPlusMaxFileNameChars) { | |
| 105 | return NULL; | |
| 106 | } | |
| 107 | ||
| 108 | //Checkk the validity of the pcName | |
| 109 | if (strlen(pcName) != uLen) { | |
| 110 | return NULL; | |
| 111 | } | |
| 112 | ||
| 113 | void *pvTmp = hfs_malloc( uLen+1 ); | |
| 114 | if ( pvTmp == NULL ) { | |
| 115 | return NULL; | |
| 116 | } | |
| 117 | ||
| 118 | memcpy(pvTmp, pcName, uLen); | |
| 119 | //Add Null terminated at the end of the name | |
| 120 | char *pcLastChar = pvTmp + uLen; | |
| 121 | *pcLastChar = '\0'; | |
| 122 | ||
| 123 | return pvTmp; | |
| 124 | } | |
| 125 | ||
| 126 | off_t | |
| 127 | blk_to_bytes(uint32_t blk, uint32_t blk_size) | |
| 128 | { | |
| 129 | return (off_t)blk * blk_size; // Avoid the overflow | |
| 130 | } |