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
|
// variation.cpp
// this file is part of Context Free
// ---------------------
// Copyright (C) 2005-2008 Mark Lentczner - markl@glyphic.com
// Copyright (C) 2005-2008 John Horigan - john@glyphic.com
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//
// John Horigan can be contacted at john@glyphic.com or at
// John Horigan, 1209 Villa St., Mountain View, CA 94041-1123, USA
//
// Mark Lentczner can be contacted at markl@glyphic.com or at
// Mark Lentczner, 1209 Villa St., Mountain View, CA 94041-1123, USA
//
//
#include "variation.h"
#include <stdlib.h>
#include <time.h>
#include <fstream>
#include "Rand48.h"
#ifdef _WIN32
#include <windows.h>
#include <Wincrypt.h>
#endif
template<class T> static int
fromString(T* str)
{
int value = 0;
int offset = 0;
int range = 1;
while (T c = *str++) {
offset += range;
value *= 26;
if ((T)'A' <= c && c <= (T)'Z') { value += c - (T)'A'; }
else if ((T)'a' <= c && c <= (T)'z') { value += c - (T)'a'; }
else return -1;
range *= 26;
}
return offset + value;
}
template<class T> static void
toString(int var, T* str, bool lowerCase)
{
int length = 0;
int range = 1;
while (var >= range) {
length += 1;
var -= range;
range *= 26;
}
str[length--] = (T)'\0';
while (length >= 0) {
T v = (T)(var % 26);
var = (var - v) / 26;
str[length--] = (T)(lowerCase ? 'a' : 'A') + v;
}
}
int Variation::fromString(const char* str) { return ::fromString(str); }
int Variation::fromString(const WinTcharType* str) { return ::fromString(str); }
void Variation::toString(int var, char* str, bool lowerCase) { ::toString(var, str, lowerCase); }
void Variation::toString(int var, WinTcharType* str, bool lowerCase) { ::toString(var, str, lowerCase); }
int Variation::recommendedMin() { return 1; }
int Variation::recommendedMax(int letters)
{
int range = 0;
int value = 26;
for (int i = 0; i < letters; i++) {
range += value;
value *= 26;
}
return range;
}
int Variation::random(int letters)
{
static bool seeded = false;
if (!seeded) {
#ifdef WIN32
HCRYPTPROV csphandle;
unsigned short randomSeed[3];
CryptAcquireContext(&csphandle, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT);
CryptGenRandom(csphandle, 6, (BYTE*)randomSeed);
CryptReleaseContext(csphandle, 0);
Rand48::Common.seed(randomSeed);
#else
/* [AMS] 2/13/2007 -- Added seeding from /dev/urandom */
unsigned short urandomSeed[3];
std::ifstream urand("/dev/urandom", std::ios::in | std::ios::binary);
if (urand.is_open()) {
urand.read((char*)urandomSeed, 3 * sizeof(unsigned short));
urand.close();
Rand48::Common.seed(urandomSeed);
} else {
Rand48::Common.setRand((long)time(0));
}
#endif
seeded = true;
}
int min = recommendedMin();
int max = recommendedMax(letters);
return min + Rand48::Common.getUnsigned() % (max - min + 1);
}
#ifdef TEST_MAIN
#include <iostream>
using namespace std;
int
main(int argc, char* argv[])
{
cout << "Variation recommended range: "
<< Variation::recommendedMin() << ","
<< Variation::recommendedMax() << endl;
char buf[100];
while (!cin.bad()) {
cin.getline(buf, sizeof(buf)/sizeof(buf[0]));
char c = buf[0];
if (c == '.') {
int v = Variation::random();
char codeUpper[Variation::maxStringLength];
char codeLower[Variation::maxStringLength];
Variation::toString(v, codeUpper, false);
Variation::toString(v, codeLower, true);
cout << "random picked " << v << endl;
cout << " or >" << codeUpper << "<" << endl;
cout << " or >" << codeLower << "<" << endl;
}
else if ('0' <= c && c <= '9') {
int v = atoi(buf);
char code[Variation::maxStringLength];
Variation::toString(v, code, false);
int v2 = Variation::fromString(code);
cout << v << " converted to >" << code << "<" << endl;
cout << " which converted back to " << v2 << endl;
}
else {
int v = Variation::fromString(buf);
char code[Variation::maxStringLength];
Variation::toString(v, code, false);
cout << ">" << buf << "< converted to " << v << endl;
cout << " which converted back to >" << code << "<" << endl;
}
}
return 0;
}
#endif
|
