source: trunk/minix/commands/i386/mtools-3.9.7/msdos.h@ 20

Last change on this file since 20 was 9, checked in by Mattia Monga, 14 years ago

Minix 3.1.2a
File size: 7.3 KB
Line 
1#ifndef MTOOLS_MSDOS_H
2#define MTOOLS_MSDOS_H
3
4/*
5 * msdos common header file
6 */
7
8#define MAX_SECTOR 8192 /* largest sector size */
9#define MDIR_SIZE 32 /* MSDOS directory entry size in bytes*/
10#define MAX_CLUSTER 8192 /* largest cluster size */
11#define MAX_PATH 128 /* largest MSDOS path length */
12#define MAX_DIR_SECS 64 /* largest directory (in sectors) */
13#define MSECTOR_SIZE msector_size
14
15#define NEW 1
16#define OLD 0
17
18#define _WORD(x) ((unsigned char)(x)[0] + (((unsigned char)(x)[1]) << 8))
19#define _DWORD(x) (_WORD(x) + (_WORD((x)+2) << 16))
20
21#define DELMARK ((char) 0xe5)
22
23struct directory {
24 char name[8]; /* 0 file name */
25 char ext[3]; /* 8 file extension */
26 unsigned char attr; /* 11 attribute byte */
27 unsigned char Case; /* 12 case of short filename */
28 unsigned char ctime_ms; /* 13 creation time, milliseconds (?) */
29 unsigned char ctime[2]; /* 14 creation time */
30 unsigned char cdate[2]; /* 16 creation date */
31 unsigned char adate[2]; /* 18 last access date */
32 unsigned char startHi[2]; /* 20 start cluster, Hi */
33 unsigned char time[2]; /* 22 time stamp */
34 unsigned char date[2]; /* 24 date stamp */
35 unsigned char start[2]; /* 26 starting cluster number */
36 unsigned char size[4]; /* 28 size of the file */
37};
38
39#define EXTCASE 0x10
40#define BASECASE 0x8
41
42#define MAX32 0xffffffff
43#define MAX_SIZE 0x7fffffff
44
45#define FILE_SIZE(dir) (_DWORD((dir)->size))
46#define START(dir) (_WORD((dir)->start))
47#define STARTHI(dir) (_WORD((dir)->startHi))
48
49/* ASSUMPTION: long is at least 32 bits */
50UNUSED(static inline void set_dword(unsigned char *data, unsigned long value))
51{
52 data[3] = (value >> 24) & 0xff;
53 data[2] = (value >> 16) & 0xff;
54 data[1] = (value >> 8) & 0xff;
55 data[0] = (value >> 0) & 0xff;
56}
57
58
59/* ASSUMPTION: short is at least 16 bits */
60UNUSED(static inline void set_word(unsigned char *data, unsigned short value))
61{
62 data[1] = (value >> 8) & 0xff;
63 data[0] = (value >> 0) & 0xff;
64}
65
66
67/*
68 * hi byte | low byte
69 * |7|6|5|4|3|2|1|0|7|6|5|4|3|2|1|0|
70 * | | | | | | | | | | | | | | | | |
71 * \ 7 bits /\4 bits/\ 5 bits /
72 * year +80 month day
73 */
74#define DOS_YEAR(dir) (((dir)->date[1] >> 1) + 1980)
75#define DOS_MONTH(dir) (((((dir)->date[1]&0x1) << 3) + ((dir)->date[0] >> 5)))
76#define DOS_DAY(dir) ((dir)->date[0] & 0x1f)
77
78/*
79 * hi byte | low byte
80 * |7|6|5|4|3|2|1|0|7|6|5|4|3|2|1|0|
81 * | | | | | | | | | | | | | | | | |
82 * \ 5 bits /\ 6 bits /\ 5 bits /
83 * hour minutes sec*2
84 */
85#define DOS_HOUR(dir) ((dir)->time[1] >> 3)
86#define DOS_MINUTE(dir) (((((dir)->time[1]&0x7) << 3) + ((dir)->time[0] >> 5)))
87#define DOS_SEC(dir) (((dir)->time[0] & 0x1f) * 2)
88
89
90typedef struct InfoSector_t {
91 unsigned char signature1[4];
92 unsigned char filler1[0x1e0];
93 unsigned char signature2[4];
94 unsigned char count[4];
95 unsigned char pos[4];
96 unsigned char filler2[14];
97 unsigned char signature3[2];
98} InfoSector_t;
99
100#define INFOSECT_SIGNATURE1 0x41615252
101#define INFOSECT_SIGNATURE2 0x61417272
102
103
104typedef struct label_blk_t {
105 unsigned char physdrive; /* 36 physical drive ? */
106 unsigned char reserved; /* 37 reserved */
107 unsigned char dos4; /* 38 dos > 4.0 diskette */
108 unsigned char serial[4]; /* 39 serial number */
109 char label[11]; /* 43 disk label */
110 char fat_type[8]; /* 54 FAT type */
111} label_blk_t;
112
113/* FAT32 specific info in the bootsector */
114typedef struct fat32_t {
115 unsigned char bigFat[4]; /* 36 nb of sectors per FAT */
116 unsigned char extFlags[2]; /* 40 extension flags */
117 unsigned char fsVersion[2]; /* 42 ? */
118 unsigned char rootCluster[4]; /* 44 start cluster of root dir */
119 unsigned char infoSector[2]; /* 48 changeable global info */
120 unsigned char backupBoot[2]; /* 50 back up boot sector */
121 unsigned char reserved[6]; /* 52 ? */
122 unsigned char reserved2[6]; /* 52 ? */
123 struct label_blk_t labelBlock;
124} fat32; /* ends at 58 */
125
126typedef struct oldboot_t {
127 struct label_blk_t labelBlock;
128 unsigned char res_2m; /* 62 reserved by 2M */
129 unsigned char CheckSum; /* 63 2M checksum (not used) */
130 unsigned char fmt_2mf; /* 64 2MF format version */
131 unsigned char wt; /* 65 1 if write track after format */
132 unsigned char rate_0; /* 66 data transfer rate on track 0 */
133 unsigned char rate_any; /* 67 data transfer rate on track<>0 */
134 unsigned char BootP[2]; /* 68 offset to boot program */
135 unsigned char Infp0[2]; /* 70 T1: information for track 0 */
136 unsigned char InfpX[2]; /* 72 T2: information for track<>0 */
137 unsigned char InfTm[2]; /* 74 T3: track sectors size table */
138 unsigned char DateF[2]; /* 76 Format date */
139 unsigned char TimeF[2]; /* 78 Format time */
140 unsigned char junk[1024 - 80]; /* 80 remaining data */
141} oldboot_t;
142
143struct bootsector {
144 unsigned char jump[3]; /* 0 Jump to boot code */
145 char banner[8] PACKED; /* 3 OEM name & version */
146 unsigned char secsiz[2] PACKED; /* 11 Bytes per sector hopefully 512 */
147 unsigned char clsiz; /* 13 Cluster size in sectors */
148 unsigned char nrsvsect[2]; /* 14 Number of reserved (boot) sectors */
149 unsigned char nfat; /* 16 Number of FAT tables hopefully 2 */
150 unsigned char dirents[2] PACKED;/* 17 Number of directory slots */
151 unsigned char psect[2] PACKED; /* 19 Total sectors on disk */
152 unsigned char descr; /* 21 Media descriptor=first byte of FAT */
153 unsigned char fatlen[2]; /* 22 Sectors in FAT */
154 unsigned char nsect[2]; /* 24 Sectors/track */
155 unsigned char nheads[2]; /* 26 Heads */
156 unsigned char nhs[4]; /* 28 number of hidden sectors */
157 unsigned char bigsect[4]; /* 32 big total sectors */
158
159 union {
160 struct fat32_t fat32;
161 struct oldboot_t old;
162 } ext;
163};
164
165#define CHAR(x) (boot->x[0])
166#define WORD(x) (_WORD(boot->x))
167#define DWORD(x) (_DWORD(boot->x))
168#define OFFSET(x) (((char *) (boot->x)) - ((char *)(boot->jump)))
169
170
171extern struct OldDos_t {
172 int tracks;
173 int sectors;
174 int heads;
175
176 int dir_len;
177 int cluster_size;
178 int fat_len;
179
180 int media;
181} old_dos[];
182
183#define FAT12 4085 /* max. number of clusters described by a 12 bit FAT */
184#define FAT16 65525
185
186#define ATTR_ARCHIVE 0x20
187#define ATTR_DIR 0x10
188#define ATTR_LABEL 0x8
189#define ATTR_SYSTEM 0x4
190#define ATTR_HIDDEN 0x2
191#define ATTR_READONLY 0x1
192
193#define HAS_BIT(entry,x) ((entry)->dir.attr & (x))
194
195#define IS_ARCHIVE(entry) (HAS_BIT((entry),ATTR_ARCHIVE))
196#define IS_DIR(entry) (HAS_BIT((entry),ATTR_DIR))
197#define IS_LABEL(entry) (HAS_BIT((entry),ATTR_LABEL))
198#define IS_SYSTEM(entry) (HAS_BIT((entry),ATTR_SYSTEM))
199#define IS_HIDDEN(entry) (HAS_BIT((entry),ATTR_HIDDEN))
200#define IS_READONLY(entry) (HAS_BIT((entry),ATTR_READONLY))
201
202
203#define MAX_SECT_PER_CLUSTER 64
204/* Experimentally, it turns out that DOS only accepts cluster sizes
205 * which are powers of two, and less than 128 sectors (else it gets a
206 * divide overflow) */
207
208
209#define FAT_SIZE(bits, sec_siz, clusters) \
210 ((((clusters)+2) * ((bits)/4) - 1) / 2 / (sec_siz) + 1)
211
212#define NEEDED_FAT_SIZE(x) FAT_SIZE((x)->fat_bits, (x)->sector_size, \
213 (x)->num_clus)
214
215/* disk size taken by FAT and clusters */
216#define DISK_SIZE(bits, sec_siz, clusters, n, cluster_size) \
217 ((n) * FAT_SIZE(bits, sec_siz, clusters) + \
218 (clusters) * (cluster_size))
219
220#define TOTAL_DISK_SIZE(bits, sec_siz, clusters, n, cluster_size) \
221 (DISK_SIZE(bits, sec_siz, clusters, n, cluster_size) + 2)
222/* approx. total disk size: assume 1 boot sector and one directory sector */
223
224extern const char *mversion;
225extern const char *mdate;
226
227extern char *Version;
228extern char *Date;
229
230
231int init(char drive, int mode);
232
233#define MT_READ 1
234#define MT_WRITE 2
235
236#endif
237
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