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
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
|
#include <stdio.h>
#include <objc/Object.h>
#include <Foundation/Foundation.h>
@interface Fsm : NSObject
{
@public
int cs;
};
// Initialize the machine. Invokes any init statement blocks. Returns 0
// if the machine begins in a non-accepting state and 1 if the machine
// begins in an accepting state.
- (int) initFsm;
// Execute the machine on a block of data. Returns -1 if after processing
// the data, the machine is in the error state and can never accept, 0 if
// the machine is in a non-accepting state and 1 if the machine is in an
// accepting state.
- (void) executeWithData:(const unsigned char *)data len:(int)len;
// Indicate that there is no more data. Returns -1 if the machine finishes
// in the error state and does not accept, 0 if the machine finishes
// in any other non-accepting state and 1 if the machine finishes in an
// accepting state.
- (int) finish;
@end
@implementation Fsm
static const char _Fsm_actions [] = { 0, 1, 0, 0 , };
static const unsigned char _Fsm_trans_keys [] = { 1u, 0u, 2u, 2u, 0u, 0u, 1u, 0u, 0u, };
static const char _Fsm_char_class [] = { 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 0 , };
static const char _Fsm_index_offsets [] = { 0, 0, 1, 2, 0 , };
static const char _Fsm_indices [] = { 0, 2, 0 , };
static const char _Fsm_index_defaults [] = { 0, 1, 1, 1, 0 , };
static const char _Fsm_trans_cond_spaces [] = { -1, -1, -1, 0 , };
static const char _Fsm_cond_targs [] = { 2, 0, 3, 0 , };
static const char _Fsm_cond_actions [] = { 1, 0, 0, 0 , };
static const char _Fsm_nfa_targs [] = { 0, 0 , };
static const char _Fsm_nfa_offsets [] = { 0, 0, 0, 0, 0 , };
static const char _Fsm_nfa_push_actions [] = { 0, 0 , };
static const char _Fsm_nfa_pop_trans [] = { 0, 0 , };
static const int Fsm_start = 1;
static const int Fsm_first_final = 3;
static const int Fsm_error = 0;
static const int Fsm_en_main = 1;
- (int) initFsm;
{
{
cs = ( int ) Fsm_start;
}
return 1;
}
- (void) executeWithData:(const unsigned char *)_data len:(int)_len;
{
const unsigned char *p = _data;
const unsigned char *pe = _data + _len;
{
int _trans = 0;
const char *_acts;
unsigned int _nacts;
const unsigned char *_keys;
const char *_inds;
if ( p == pe )
goto _test_eof;
if ( cs == 0 )
goto _out;
_resume :
_keys = _Fsm_trans_keys + (cs<<1);
_inds = _Fsm_indices + _Fsm_index_offsets[cs];
if ( ((*( p ))
)<= 232 && ((*( p ))
)>= 10 )
{
int _ic = ( int ) _Fsm_char_class[( int ) ((*( p ))
)- 10];
if ( _ic <= ( int ) (*( _keys+1 ))
&& _ic >= ( int ) (*( _keys ))
)
_trans = ( int ) (*( _inds + ( int ) (_ic - ( int ) (*( _keys ))
) ))
;
else
_trans = ( int ) _Fsm_index_defaults[cs];
}
else
{
_trans = ( int ) _Fsm_index_defaults[cs];
}
goto _match_cond;
_match_cond :
cs = ( int ) _Fsm_cond_targs[_trans];
if ( _Fsm_cond_actions[_trans]== 0 )
goto _again;
_acts = _Fsm_actions + _Fsm_cond_actions[_trans];
_nacts = ( unsigned int ) (*( _acts ))
;
_acts += 1;
while ( _nacts > 0 )
{
switch ( (*( _acts ))
) {
case 0 :
{
printf("yes\n");
}
break;
}
_nacts -= 1;
_acts += 1;
}
_again :
if ( cs == 0 )
goto _out;
p += 1;
if ( p != pe )
goto _resume;
_test_eof :
{}
_out :
{}
}
}
- (int) finish;
{
if ( cs == Fsm_error )
return -1;
else if ( cs >= Fsm_first_final )
return 1;
return 0;
}
@end
#define BUFSIZE 2048
Fsm *fsm;
unsigned char buf[BUFSIZE];
void test( unsigned char *buf, int len )
{
fsm = [[Fsm alloc] init];
[fsm initFsm];
[fsm executeWithData:buf len:len];
if ( [fsm finish] > 0 )
printf("ACCEPT\n");
else
printf("FAIL\n");
}
unsigned char data1[] = { 0xe8, 10 };
unsigned char data2[] = { 0xf8, 10 };
int main()
{
test( data1, 2 );
test( data2, 2 );
return 0;
}
|
