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
126
127
128
129
130
131
132
133
|
#include <rw.h>
#include <string.h>
#include "vfs.h"
struct FILE_VFS
{
int used;
rw::uint8 *data;
int pos;
int size;
};
FILE_VFS vfsfiles[64];
VFS *globalVFS;
void*
vfs_fopen(const char *path, const char *mode)
{
int flags = 0;
int i, j;
char *r, *w, *plus;
// printf("trying to open <%s> mode <%s>\n", path, mode);
const char *file = strrchr((char*)path, '/');
if(file)
file++;
else
file = path;
for(i = 0; i < nelem(vfsfiles); i++){
if(!vfsfiles[i].used)
goto found;
}
// no file pointer available
return nil;
found:
// why can't we pass const char*? urghhh....
r = strchr((char*)mode, 'r');
w = strchr((char*)mode, 'w');
plus = strchr((char*)mode, '+');
// cannot write files
if(w || plus)
return nil;
for(j = 0; j < globalVFS->numFiles; j++){
if(strcmp(globalVFS->files[j].name, file) == 0)
goto found2;
}
// file not found
return nil;
found2:
vfsfiles[i].used = 1;
vfsfiles[i].data = globalVFS->files[j].data;
vfsfiles[i].pos = 0;
vfsfiles[i].size = globalVFS->files[j].length;
return &vfsfiles[i];
}
int
vfs_fclose(void *fp)
{
FILE_VFS *f = (FILE_VFS*)fp;
if(!f->used)
return EOF;
f->used = 0;
f->data = nil;
return 0;
}
int
vfs_fseek(void *fp, long offset, int whence)
{
FILE_VFS *f = (FILE_VFS*)fp;
switch(whence){
case 0:
f->pos = offset;
break;
case 1:
f->pos += offset;
break;
case 2:
f->pos = f->size - offset;
break;
}
if(f->pos > f->size) f->pos = f->size;
return f->pos;
}
long
vfs_ftell(void *fp)
{
FILE_VFS *f = (FILE_VFS*)fp;
return f->pos;
}
size_t
vfs_fread(void *ptr, size_t size, size_t nmemb, void *fp)
{
FILE_VFS *f = (FILE_VFS*)fp;
size_t sz = size*nmemb;
if(sz > f->size-f->pos)
sz = f->size-f->pos;
memcpy(ptr, f->data+f->pos, sz);
f->pos += sz;
return sz/size;
}
size_t
vfs_fwrite(const void *ptr, size_t size, size_t nmemb, void *fp)
{
return 0;
}
int
vfs_feof(void *fp)
{
FILE_VFS *f = (FILE_VFS*)fp;
return f->pos >= f->size;
}
void
installVFS(VFS *vfs)
{
globalVFS = vfs;
rw::engine->filefuncs.rwfopen = vfs_fopen;
rw::engine->filefuncs.rwfclose = vfs_fclose;
rw::engine->filefuncs.rwfseek = vfs_fseek;
rw::engine->filefuncs.rwftell = vfs_ftell;
rw::engine->filefuncs.rwfread = vfs_fread;
rw::engine->filefuncs.rwfwrite = vfs_fwrite;
rw::engine->filefuncs.rwfeof = vfs_feof;
}
|
