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Commit	Line	Data
	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	}