1#ifndef MTOOLS_LLONG_H
2#define MTOOLS_LLONG_H
3
4/*  Copyright 1999,2001-2004,2007-2009 Alain Knaff.
5 *  This file is part of mtools.
6 *
7 *  Mtools is free software: you can redistribute it and/or modify
8 *  it under the terms of the GNU General Public License as published by
9 *  the Free Software Foundation, either version 3 of the License, or
10 *  (at your option) any later version.
11 *
12 *  Mtools is distributed in the hope that it will be useful,
13 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
14 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 *  GNU General Public License for more details.
16 *
17 *  You should have received a copy of the GNU General Public License
18 *  along with Mtools.  If not, see <http://www.gnu.org/licenses/>.
19 */
20
21#if 1
22
23
24#ifdef HAVE_OFF_T_64
25/* if off_t is already 64 bits, be happy, and don't worry about the
26 * loff_t and llseek stuff */
27#define MT_OFF_T off_t
28#define MT_SIZE_T size_t
29#endif
30
31#ifndef MT_OFF_T
32# if defined(HAVE_LLSEEK) || defined(HAVE_LSEEK64)
33/* we have llseek. Now, what's its type called? loff_t or offset_t ? */
34#  ifdef HAVE_LOFF_T
35#   define MT_OFF_T loff_t
36/* use the same type for size. Better to get signedness wrong than width */
37#   define MT_SIZE_T loff_t
38#  else
39#   ifdef HAVE_OFFSET_T
40#    define MT_OFF_T offset_t
41/* use the same type for size. Better to get signedness wrong than width */
42#    define MT_SIZE_T offset_t
43#   endif
44#  endif
45# endif
46#endif
47
48#ifndef MT_OFF_T
49/* we still don't have a suitable mt_off_t type...*/
50# ifdef HAVE_LONG_LONG
51/* ... first try long long ... */
52#  define MT_OFF_T long long
53#  define MT_SIZE_T unsigned long long
54# else
55#  ifdef HAVE_OFF64_T
56#   define MT_OFF_T off64_t
57#   define MT_SIZE_T off64_t
58#  else
59/* ... and if that fails, fall back on good ole' off_t */
60#   define MT_OFF_T off_t
61#   define MT_SIZE_T size_t
62#  endif
63# endif
64#endif
65
66typedef MT_OFF_T mt_off_t;
67typedef MT_SIZE_T mt_size_t;
68
69#else
70/* testing: meant to flag dubious assignments between 32 bit length types
71 * and 64 bit ones */
72typedef struct {
73	unsigned int lo;
74	int high;
75} *mt_off_t;
76
77typedef struct {
78	unsigned int lo;
79	unsigned int high;
80} *mt_size_t;
81
82#endif
83
84#define min(a,b) ((a) < (b) ? (a) : (b))
85#define MAX_OFF_T_B(bits) \
86	((((mt_off_t) 1 << min(bits-1, sizeof(mt_off_t)*8 - 2)) -1) << 1 | 1)
87
88#if defined(HAVE_LLSEEK) || defined(HAVE_LSEEK64)
89# define SEEK_BITS 63
90#else
91# define SEEK_BITS (sizeof(off_t) * 8 - 1)
92#endif
93
94extern const mt_off_t max_off_t_31;
95extern const mt_off_t max_off_t_41;
96extern const mt_off_t max_off_t_seek;
97
98extern off_t truncBytes32(mt_off_t off);
99extern int fileTooBig(mt_off_t off);
100mt_off_t sectorsToBytes(Stream_t *This, off_t off);
101
102mt_size_t getfree(Stream_t *Stream);
103int getfreeMinBytes(Stream_t *Stream, mt_size_t ref);
104
105Stream_t *find_device(char drive, int mode, struct device *out_dev,
106		      struct bootsector *boot,
107		      char *name, int *media, mt_size_t *maxSize,
108		      int *isRop);
109
110int mt_lseek(int fd, mt_off_t where, int whence);
111
112
113unsigned int log_2(int);
114
115#endif
116