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
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
|
#include <winpr/crt.h>
#include <winpr/winpr.h>
#include <winpr/collections.h>
/**
* Ternary Raster Operations:
* See "Windows Graphics Programming: Win32 GDI and DirectDraw", chapter 11. Advanced Bitmap
* Graphics
*
* Operators:
*
* AND & a
* OR | o
* NOT ~ n
* XOR ^ x
*
* Operands:
*
* Pen/Brush P
* Destination D
* Source S
*
* Example:
*
* Raster operation which returns P if S is 1 or D otherwise:
* (rop_S & rop_P) | (~rop_S & rop_D); -> 0xE2 (0x00E20746)
*
* Postfix notation: DSPDxax
* Infix notation: D^(S&(P^D))), (S&P)|(~S&D)
*
* DSPDxax using D^(S&(P^D)):
*
* mov eax, P // P
* xor eax, D // P^D
* and eax, S // S&(P^D)
* xor eax, D // D^(S&(P^D))
* mov D, eax // write result
*
* DSPDxax using (S&P)|(~S&D):
*
* mov eax, S // S
* and eax, P // S&P
* mov ebx, S // S
* not ebx // ~S
* and ebx, D // ~D&D
* or eax, ebx // (S&P)|(~S&D)
* mov D, eax // write result
*
* Raster operation lower word encoding:
*
* _______________________________________________________________________________
* | | | | | | | | | | | | | | | | |
* | Op5 | Op4 | Op3 | Op2 | Op1 | Not| Parse String | Offset |
* |____|____|____|____|____|____|____|____|____|____|____|____|____|____|____|____|
* 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
*
* Operator:
* 0: NOT
* 1: XOR
* 2: OR
* 3: AND
*
* Parse String:
* 0: SPDDDDDD
* 1: SPDSPDSP
* 2: SDPSDPSD
* 3: DDDDDDDD
* 4: DDDDDDDD
* 5: S+SP-DSS
* 6: S+SP-PDS
* 7: S+SD-PDS
*
* The lower word for 0x00E20746 is 0x0746 (00000111 01000110)
*
* 00 Op5 (NOT, n)
* 00 Op4 (NOT, n)
* 01 Op3 (XOR, x)
* 11 Op2 (AND, a)
* 01 Op1 (XOR, x)
* 0 Not (unused)
* 001 String (SPDSPDSP)
* 10 Offset (2)
*
* We shift SPDSPDSP to the left by 2: DSPDSPSP
*
* We have 5 operators: 3 binary operators and the last two are unary operators,
* so only four operands are needed. The parse string is truncated to reflect
* the number of operands we need: DSPD
*
* The operator string (from Op1 to Op5) is xaxnn, which can be simplified to xax
*
* The complete string representing the operation is DSPDxax
*
*/
static char* gdi_convert_postfix_to_infix(const char* postfix)
{
size_t length = 0;
BOOL unary = 0;
wStack* stack = NULL;
size_t al = 0;
size_t bl = 0;
size_t cl = 0;
size_t dl = 0;
char* a = NULL;
char* b = NULL;
char* c = NULL;
char* d = NULL;
bl = cl = dl = 0;
stack = Stack_New(FALSE);
length = strlen(postfix);
for (size_t i = 0; i < length; i++)
{
if ((postfix[i] == 'P') || (postfix[i] == 'D') || (postfix[i] == 'S'))
{
/* token is an operand, push on the stack */
a = malloc(2);
a[0] = postfix[i];
a[1] = '\0';
// printf("Operand: %s\n", a);
Stack_Push(stack, a);
}
else
{
/* token is an operator */
unary = FALSE;
c = malloc(2);
c[0] = postfix[i];
c[1] = '\0';
if (c[0] == 'a')
{
c[0] = '&';
}
else if (c[0] == 'o')
{
c[0] = '|';
}
else if (c[0] == 'n')
{
c[0] = '~';
unary = TRUE;
}
else if (c[0] == 'x')
{
c[0] = '^';
}
else
{
printf("invalid operator: %c\n", c[0]);
}
// printf("Operator: %s\n", c);
a = (char*)Stack_Pop(stack);
if (unary)
b = NULL;
else
b = (char*)Stack_Pop(stack);
al = strlen(a);
if (b)
bl = strlen(b);
cl = 1;
dl = al + bl + cl + 3;
d = malloc(dl + 1);
sprintf_s(d, dl, "(%s%s%s)", b ? b : "", c, a);
Stack_Push(stack, d);
free(a);
free(b);
free(c);
}
}
d = (char*)Stack_Pop(stack);
Stack_Free(stack);
return d;
}
static const char* test_ROP3[] = { "DSPDxax", "PSDPxax", "SPna", "DSna", "DPa",
"PDxn", "DSxn", "PSDnox", "PDSona", "DSPDxox",
"DPSDonox", "SPDSxax", "DPon", "DPna", "Pn",
"PDna", "DPan", "DSan", "DSxn", "DPa",
"D", "DPno", "SDno", "PDno", "DPo" };
int TestGdiRop3(int argc, char* argv[])
{
WINPR_UNUSED(argc);
WINPR_UNUSED(argv);
for (size_t index = 0; index < sizeof(test_ROP3) / sizeof(test_ROP3[0]); index++)
{
const char* postfix = test_ROP3[index];
char* infix = gdi_convert_postfix_to_infix(postfix);
if (!infix)
return -1;
printf("%s\t\t%s\n", postfix, infix);
free(infix);
}
return 0;
}
|
