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1 /*  Copyright 1995 David C. Niemi
2  *  Copyright 1996-2002,2008,2009 Alain Knaff.
3  *  This file is part of mtools.
4  *
5  *  Mtools is free software: you can redistribute it and/or modify
6  *  it under the terms of the GNU General Public License as published by
7  *  the Free Software Foundation, either version 3 of the License, or
8  *  (at your option) any later version.
9  *
10  *  Mtools is distributed in the hope that it will be useful,
11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13  *  GNU General Public License for more details.
14  *
15  *  You should have received a copy of the GNU General Public License
16  *  along with Mtools.  If not, see <http://www.gnu.org/licenses/>.
17  */
18 #include "sysincludes.h"
19 #include "msdos.h"
20 #include "stream.h"
21 #include "mtools.h"
22 #include "file.h"
23 #include "fs.h"
24 #include "file_name.h"
25 
26 /* #define DEBUG */
27 
28 /*
29  * Read a directory entry into caller supplied buffer
30  */
dir_read(direntry_t * entry,int * error)31 struct directory *dir_read(direntry_t *entry, int *error)
32 {
33 	int n;
34 	*error = 0;
35 	if((n=force_read(entry->Dir, (char *) (&entry->dir),
36 			 (mt_off_t) entry->entry * MDIR_SIZE,
37 			 MDIR_SIZE)) != MDIR_SIZE) {
38 		if (n < 0) {
39 			*error = -1;
40 		}
41 		return NULL;
42 	}
43 	return &entry->dir;
44 }
45 
46 /*
47  * Make a subdirectory grow in length.  Only subdirectories (not root)
48  * may grow.  Returns a 0 on success, 1 on failure (disk full), or -1
49  * on error.
50  */
51 
dir_grow(Stream_t * Dir,int size)52 int dir_grow(Stream_t *Dir, int size)
53 {
54 	Stream_t *Stream = GetFs(Dir);
55 	DeclareThis(FsPublic_t);
56 	int ret;
57 	unsigned int buflen;
58 	char *buffer;
59 
60 	if (!getfreeMinClusters(Dir, 1))
61 		return -1;
62 
63 	buflen = This->cluster_size * This->sector_size;
64 
65 	if(! (buffer=malloc(buflen)) ){
66 		perror("dir_grow: malloc");
67 		return -1;
68 	}
69 
70 	memset((char *) buffer, '\0', buflen);
71 	ret = force_write(Dir, buffer, (mt_off_t) size * MDIR_SIZE, buflen);
72 	free(buffer);
73 	if(ret < (int) buflen)
74 		return -1;
75 	return 0;
76 }
77 
78 
low_level_dir_write(direntry_t * entry)79 void low_level_dir_write(direntry_t *entry)
80 {
81 	force_write(entry->Dir,
82 		    (char *) (&entry->dir),
83 		    (mt_off_t) entry->entry * MDIR_SIZE, MDIR_SIZE);
84 }
85 
low_level_dir_write_end(Stream_t * Dir,int entry)86 void low_level_dir_write_end(Stream_t *Dir, int entry)
87 {
88 	char zero = ENDMARK;
89 	force_write(Dir, &zero, (mt_off_t) entry * MDIR_SIZE, 1);
90 }
91 
92 /*
93  * Make a directory entry.  Builds a directory entry based on the
94  * name, attribute, starting cluster number, and size.  Returns a pointer
95  * to a static directory structure.
96  */
97 
mk_entry(const dos_name_t * dn,unsigned char attr,unsigned int fat,size_t size,time_t date,struct directory * ndir)98 struct directory *mk_entry(const dos_name_t *dn, unsigned char attr,
99 			   unsigned int fat, size_t size, time_t date,
100 			   struct directory *ndir)
101 {
102 	struct tm *now;
103 	time_t date2 = date;
104 	unsigned char hour, min_hi, min_low, sec;
105 	unsigned char year, month_hi, month_low, day;
106 
107 	now = localtime(&date2);
108 	dosnameToDirentry(dn, ndir);
109 	ndir->attr = attr;
110 	ndir->ctime_ms = 0;
111 	hour = now->tm_hour << 3;
112 	min_hi = now->tm_min >> 3;
113 	min_low = now->tm_min << 5;
114 	sec = now->tm_sec / 2;
115 	ndir->ctime[1] = ndir->time[1] = hour + min_hi;
116 	ndir->ctime[0] = ndir->time[0] = min_low + sec;
117 	year = (now->tm_year - 80) << 1;
118 	month_hi = (now->tm_mon + 1) >> 3;
119 	month_low = (now->tm_mon + 1) << 5;
120 	day = now->tm_mday;
121 	ndir -> adate[1] = ndir->cdate[1] = ndir->date[1] = year + month_hi;
122 	ndir -> adate[0] = ndir->cdate[0] = ndir->date[0] = month_low + day;
123 
124 	set_word(ndir->start, fat & 0xffff);
125 	set_word(ndir->startHi, fat >> 16);
126 	set_dword(ndir->size, size);
127 	return ndir;
128 }
129 
130 /*
131  * Make a directory entry from base name. This is supposed to be used
132  * from places such as mmd for making special entries (".", "..", "/", ...)
133  * Thus it doesn't bother with character set conversions
134  */
mk_entry_from_base(const char * base,unsigned char attr,unsigned int fat,size_t size,time_t date,struct directory * ndir)135 struct directory *mk_entry_from_base(const char *base, unsigned char attr,
136 				     unsigned int fat, size_t size, time_t date,
137 				     struct directory *ndir)
138 {
139 	struct dos_name_t dn;
140 	strncpy(dn.base, base, 8);
141 	strncpy(dn.ext, "   ", 3);
142 	return mk_entry(&dn, attr, fat, size, date, ndir);
143 }
144