1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
|
// license:BSD-3-Clause
// copyright-holders:Aaron Giles
/***************************************************************************
hardisk.c
Generic MAME hard disk implementation, with differencing files
***************************************************************************/
#include "harddisk.h"
#include <stdlib.h>
/***************************************************************************
TYPE DEFINITIONS
***************************************************************************/
struct hard_disk_file
{
chd_file * chd; /* CHD file */
hard_disk_info info; /* hard disk info */
};
/***************************************************************************
CORE IMPLEMENTATION
***************************************************************************/
/*-------------------------------------------------
hard_disk_open - open a hard disk handle,
given a chd_file
-------------------------------------------------*/
hard_disk_file *hard_disk_open(chd_file *chd)
{
int cylinders, heads, sectors, sectorbytes;
hard_disk_file *file;
astring metadata;
chd_error err;
/* punt if no CHD */
if (chd == NULL)
return NULL;
/* read the hard disk metadata */
err = chd->read_metadata(HARD_DISK_METADATA_TAG, 0, metadata);
if (err != CHDERR_NONE)
return NULL;
/* parse the metadata */
if (sscanf(metadata, HARD_DISK_METADATA_FORMAT, &cylinders, &heads, §ors, §orbytes) != 4)
return NULL;
/* allocate memory for the hard disk file */
file = (hard_disk_file *)malloc(sizeof(hard_disk_file));
if (file == NULL)
return NULL;
/* fill in the data */
file->chd = chd;
file->info.cylinders = cylinders;
file->info.heads = heads;
file->info.sectors = sectors;
file->info.sectorbytes = sectorbytes;
return file;
}
/*-------------------------------------------------
hard_disk_close - close a hard disk handle
-------------------------------------------------*/
void hard_disk_close(hard_disk_file *file)
{
free(file);
}
/*-------------------------------------------------
hard_disk_get_chd - get a handle to a CHD
from a hard disk
-------------------------------------------------*/
chd_file *hard_disk_get_chd(hard_disk_file *file)
{
return file->chd;
}
/*-------------------------------------------------
hard_disk_get_info - return information about
a hard disk
-------------------------------------------------*/
hard_disk_info *hard_disk_get_info(hard_disk_file *file)
{
return &file->info;
}
/*-------------------------------------------------
hard_disk_read - read sectors from a hard
disk
-------------------------------------------------*/
UINT32 hard_disk_read(hard_disk_file *file, UINT32 lbasector, void *buffer)
{
chd_error err = file->chd->read_units(lbasector, buffer);
return (err == CHDERR_NONE);
}
/*-------------------------------------------------
hard_disk_write - write sectors to a hard
disk
-------------------------------------------------*/
UINT32 hard_disk_write(hard_disk_file *file, UINT32 lbasector, const void *buffer)
{
chd_error err = file->chd->write_units(lbasector, buffer);
return (err == CHDERR_NONE);
}
|