author | Stefan Vogel <sv@exept.de> |
Tue, 30 Mar 2010 15:39:21 +0200 | |
changeset 2439 | 8ef4ad63fb9b |
parent 2438 | 3601d0065aff |
child 2440 | 1460919397a4 |
permissions | -rw-r--r-- |
1925 | 1 |
" |
2 |
COPYRIGHT (c) 2007 by eXept Software AG |
|
3 |
All Rights Reserved |
|
4 |
||
5 |
This software is furnished under a license and may be used |
|
6 |
only in accordance with the terms of that license and with the |
|
7 |
inclusion of the above copyright notice. This software may not |
|
8 |
be provided or otherwise made available to, or used by, any |
|
9 |
other person. No title to or ownership of the software is |
|
10 |
hereby transferred. |
|
11 |
" |
|
1606 | 12 |
"{ Package: 'stx:libbasic2' }" |
13 |
||
14 |
Object subclass:#RandomGenerator |
|
15 |
instanceVariableNames:'' |
|
2432 | 16 |
classVariableNames:'RandFile SharedGenerator' |
1606 | 17 |
poolDictionaries:'' |
18 |
category:'Magnitude-Numbers' |
|
19 |
! |
|
20 |
||
21 |
!RandomGenerator class methodsFor:'documentation'! |
|
22 |
||
1925 | 23 |
copyright |
24 |
" |
|
25 |
COPYRIGHT (c) 2007 by eXept Software AG |
|
26 |
All Rights Reserved |
|
27 |
||
28 |
This software is furnished under a license and may be used |
|
29 |
only in accordance with the terms of that license and with the |
|
30 |
inclusion of the above copyright notice. This software may not |
|
31 |
be provided or otherwise made available to, or used by, any |
|
32 |
other person. No title to or ownership of the software is |
|
33 |
hereby transferred. |
|
34 |
" |
|
35 |
! |
|
36 |
||
1606 | 37 |
documentation |
38 |
" |
|
39 |
This is a Random number generator, which uses either a OS random number generator, |
|
40 |
or a ST/X internal random number generator. |
|
41 |
||
42 |
[author:] |
|
43 |
Stefan Vogel |
|
44 |
||
45 |
[see also:] |
|
46 |
Random HashRandom Rc4Stream |
|
47 |
||
48 |
[instance variables:] |
|
49 |
||
50 |
[class variables:] |
|
51 |
RandFile the FileStream we get random numbers from |
|
52 |
" |
|
53 |
! ! |
|
54 |
||
55 |
!RandomGenerator class methodsFor:'initialization'! |
|
56 |
||
57 |
initialize |
|
58 |
"want to be informed when returning from snapshot" |
|
59 |
||
60 |
ObjectMemory addDependent:self. |
|
61 |
||
62 |
||
63 |
! |
|
64 |
||
65 |
openRandFile |
|
66 |
"try to open a random device" |
|
67 |
||
68 |
|randDevName| |
|
69 |
||
70 |
RandFile isStream ifTrue:[ |
|
71 |
RandFile close. |
|
72 |
]. |
|
73 |
||
74 |
RandFile := false. "prevent retry" |
|
75 |
||
76 |
randDevName := self randPath. |
|
77 |
randDevName notNil ifTrue:[ |
|
78 |
randDevName := randDevName asFilename. |
|
79 |
randDevName isReadable ifTrue:[ |
|
80 |
RandFile := randDevName readStream |
|
81 |
]. |
|
82 |
]. |
|
83 |
! ! |
|
84 |
||
85 |
!RandomGenerator class methodsFor:'instance creation'! |
|
86 |
||
87 |
new |
|
88 |
"return a new random number generator. |
|
89 |
Try to get system random numbers from device (e.g. in LINUX). |
|
90 |
If no system random nubers are available, fall back to |
|
91 |
a cryptographic secure PRNG (part of the extra libcrypt package). |
|
92 |
As last resort fallback to the cryptographic insecure linear builtin PRNG" |
|
93 |
||
2439
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
94 |
|result| |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
95 |
|
2432 | 96 |
SharedGenerator notNil ifTrue:[ |
97 |
"each time, we do an new, add some entropy to the SharedGenerator" |
|
2438
3601d0065aff
changed: #new - use microSecondTime to add entropy
Stefan Vogel <sv@exept.de>
parents:
2432
diff
changeset
|
98 |
SharedGenerator addEntropy:OperatingSystem getMicrosecondTime. |
2432 | 99 |
^ SharedGenerator. |
100 |
]. |
|
101 |
||
2439
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
102 |
[ |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
103 |
result := OperatingSystem randomBytesInto:(ByteArray new:1). |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
104 |
] on:PrimitiveFailure do:[:ex| ]. |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
105 |
|
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
106 |
result notNil ifTrue:[ |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
107 |
"OperatingSystem knows how to get random bytes" |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
108 |
RandFile := true. |
2432 | 109 |
SharedGenerator := self basicNew. |
110 |
^ SharedGenerator. |
|
2439
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
111 |
] ifFalse:[ |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
112 |
RandFile isNil ifTrue:[ |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
113 |
self openRandFile. |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
114 |
]. |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
115 |
RandFile isStream ifTrue:[ |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
116 |
SharedGenerator := self basicNew. |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
117 |
^ SharedGenerator. |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
118 |
]. |
1606 | 119 |
]. |
120 |
||
2432 | 121 |
Rc4Cipher notNil ifTrue:[ |
122 |
SharedGenerator := Rc4Cipher random. |
|
123 |
^ SharedGenerator. |
|
124 |
]. |
|
125 |
||
126 |
SharedGenerator := Random sharedGenerator. |
|
127 |
^ SharedGenerator. |
|
1606 | 128 |
! |
129 |
||
130 |
random |
|
131 |
"alias for new - protocol compatibility with StreamCiphers" |
|
132 |
||
133 |
^ self new |
|
134 |
! ! |
|
135 |
||
2432 | 136 |
!RandomGenerator class methodsFor:'adding entropy'! |
137 |
||
138 |
addEntropy:entropyBytes |
|
139 |
SharedGenerator notNil ifTrue:[ |
|
140 |
SharedGenerator addEntropy:entropyBytes |
|
141 |
]. |
|
142 |
! ! |
|
143 |
||
1606 | 144 |
!RandomGenerator class methodsFor:'change & update'! |
145 |
||
146 |
update:something with:aParameter from:changedObject |
|
147 |
"handle image restarts and flush any device resource handles" |
|
148 |
||
2432 | 149 |
SharedGenerator := nil. |
1606 | 150 |
RandFile notNil ifTrue:[ |
151 |
RandFile := nil. |
|
152 |
self openRandFile. |
|
153 |
]. |
|
154 |
! ! |
|
155 |
||
156 |
!RandomGenerator class methodsFor:'queries'! |
|
157 |
||
158 |
randPath |
|
159 |
"path to a file/device that is a source or random numbers" |
|
160 |
||
161 |
OperatingSystem isUNIXlike ifTrue:[^ '/dev/urandom']. |
|
162 |
^ nil. |
|
163 |
! ! |
|
164 |
||
2432 | 165 |
!RandomGenerator methodsFor:'adding entropy'! |
166 |
||
167 |
addEntropy:entropyBytes |
|
168 |
"add some entropy - ignored here, since I am file based" |
|
169 |
||
170 |
^ self |
|
171 |
! ! |
|
172 |
||
2439
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
173 |
!RandomGenerator methodsFor:'basic reading'! |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
174 |
|
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
175 |
nextByte |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
176 |
"get the next random byte" |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
177 |
|
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
178 |
RandFile == true ifTrue:[ |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
179 |
^ OperatingSystem randomBytesInto:1. |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
180 |
]. |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
181 |
|
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
182 |
^ RandFile nextByte |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
183 |
|
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
184 |
" |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
185 |
RandomGenerator new nextByte |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
186 |
" |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
187 |
|
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
188 |
" |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
189 |
Distribution should be equal: |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
190 |
|
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
191 |
|r bag| |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
192 |
r := RandomGenerator new. |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
193 |
bag := Bag new. |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
194 |
1000000 timesRepeat:[ |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
195 |
bag add:(r nextByte). |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
196 |
]. |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
197 |
bag. |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
198 |
Transcript showCR:bag contents |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
199 |
" |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
200 |
|
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
201 |
"Created: / 11.11.1999 / 09:25:39 / stefan" |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
202 |
! |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
203 |
|
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
204 |
nextBytes:cnt |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
205 |
"get the next cnt random bytes" |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
206 |
|
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
207 |
RandFile == true ifTrue:[ |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
208 |
^ OperatingSystem randomBytesInto:(ByteArray new:cnt). |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
209 |
]. |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
210 |
^ RandFile nextBytes:cnt. |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
211 |
|
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
212 |
" |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
213 |
RandomGenerator new nextBytes:4 |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
214 |
" |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
215 |
|
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
216 |
"Created: / 11.11.1999 / 09:25:39 / stefan" |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
217 |
"Modified: / 11.11.1999 / 09:52:26 / stefan" |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
218 |
! |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
219 |
|
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
220 |
nextInteger |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
221 |
"return the next integral random number, |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
222 |
in the range 0 .. 16r3FFFFFFF." |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
223 |
|
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
224 |
|res| |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
225 |
|
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
226 |
RandFile == true ifTrue:[ |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
227 |
^ OperatingSystem randomBytesInto:4. |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
228 |
]. |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
229 |
|
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
230 |
res := self nextBytes:4. |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
231 |
^ ((((((res at:1) bitAnd:16r3F) * 256) + (res at:2)) * 256) + (res at:3)) * 256 + (res at:4) |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
232 |
|
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
233 |
|
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
234 |
|
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
235 |
" |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
236 |
|r| |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
237 |
r := RandomGenerator new. |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
238 |
Transcript showCR:r nextInteger. |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
239 |
Transcript showCR:r nextInteger. |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
240 |
Transcript showCR:r nextInteger. |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
241 |
Transcript showCR:r nextInteger. |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
242 |
" |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
243 |
|
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
244 |
"Modified: / 11.11.1999 / 10:08:10 / stefan" |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
245 |
! ! |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
246 |
|
1606 | 247 |
!RandomGenerator methodsFor:'reading'! |
248 |
||
249 |
next |
|
250 |
"return the next random number in the range 0..1" |
|
251 |
||
252 |
^ self nextInteger / 16r3fffffff asFloat |
|
253 |
||
254 |
" |
|
255 |
|r| |
|
256 |
r := RandomGenerator new. |
|
257 |
Transcript showCR:r next. |
|
258 |
Transcript showCR:r next. |
|
259 |
Transcript showCR:r next. |
|
260 |
Transcript showCR:r next. |
|
261 |
" |
|
262 |
||
263 |
"Modified: / 11.11.1999 / 10:31:35 / stefan" |
|
264 |
! |
|
265 |
||
266 |
nextBetween:start and:stop |
|
267 |
"return a random number between start and stop." |
|
268 |
||
269 |
|rnd| |
|
270 |
||
271 |
rnd := self next. |
|
272 |
rnd := rnd * (stop - start) asFloat. |
|
273 |
rnd := rnd + start asFloat. |
|
274 |
^ rnd |
|
275 |
||
276 |
" |
|
277 |
|r| |
|
278 |
r := RandomGenerator new. |
|
279 |
Transcript showCR:(r nextBetween:1 and:10). |
|
280 |
Transcript showCR:(r nextBetween:1 and:10). |
|
281 |
Transcript showCR:(r nextBetween:1 and:10). |
|
282 |
Transcript showCR:(r nextBetween:1 and:10). |
|
283 |
" |
|
284 |
||
285 |
"Created: / 11.11.1999 / 10:27:56 / stefan" |
|
286 |
! |
|
287 |
||
288 |
nextBoolean |
|
289 |
"return true or false by random" |
|
290 |
||
291 |
^ self nextByte <= 127 |
|
292 |
||
293 |
" |
|
294 |
|r| |
|
295 |
r := RandomGenerator new. |
|
296 |
Transcript showCR:r nextBoolean. |
|
297 |
Transcript showCR:r nextBoolean. |
|
298 |
Transcript showCR:r nextBoolean. |
|
299 |
Transcript showCR:r nextBoolean. |
|
300 |
" |
|
301 |
||
302 |
" |
|
2439
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
303 |
Distribution should approach 50/50: |
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
304 |
|
1606 | 305 |
|r bag| |
306 |
r := RandomGenerator new. |
|
307 |
bag := Bag new. |
|
308 |
1000000 timesRepeat:[ |
|
309 |
bag add:(r nextBoolean). |
|
310 |
]. |
|
311 |
Transcript showCR:bag contents |
|
312 |
" |
|
313 |
||
314 |
"Created: / 11.11.1999 / 09:25:39 / stefan" |
|
315 |
"Modified: / 12.11.1999 / 17:22:01 / stefan" |
|
316 |
! |
|
317 |
||
1640 | 318 |
nextCharacters:cnt |
319 |
"get the next cnt printable characters. |
|
320 |
We answer characters in the ascii range (codepoints 32 - 127)" |
|
321 |
||
322 |
|bytes string| |
|
323 |
||
324 |
bytes := self nextBytes:cnt. |
|
325 |
string := String new:cnt. |
|
326 |
||
327 |
bytes keysAndValuesDo:[:eachIndex :eachByte| |
|
328 |
string at:eachIndex put:(Character value:(eachByte \\ 95 + 32)). |
|
329 |
]. |
|
330 |
||
331 |
^ string |
|
332 |
||
333 |
||
334 |
" |
|
335 |
RandomGenerator new nextCharacters:8 |
|
336 |
" |
|
337 |
! |
|
338 |
||
1606 | 339 |
nextIntegerBetween:start and:stop |
340 |
"return an integral random number between start and stop" |
|
341 |
||
342 |
|rnd| |
|
343 |
||
344 |
rnd := self next. |
|
345 |
rnd := rnd * ((stop - start) asFloat + 1.0). |
|
346 |
^ rnd truncated + start |
|
347 |
||
348 |
" |
|
349 |
|r| |
|
350 |
r := RandomGenerator new. |
|
351 |
Transcript showCR:(r nextIntegerBetween:1 and:10). |
|
352 |
Transcript showCR:(r nextIntegerBetween:1 and:10). |
|
353 |
Transcript showCR:(r nextIntegerBetween:1 and:10). |
|
354 |
Transcript showCR:(r nextIntegerBetween:1 and:10). |
|
355 |
" |
|
356 |
||
357 |
" |
|
358 |
|r bag| |
|
359 |
r := RandomGenerator new. |
|
360 |
bag := Bag new. |
|
361 |
1000000 timesRepeat:[ |
|
362 |
bag add:(r nextIntegerBetween:-1 and:1). |
|
363 |
]. |
|
364 |
Transcript showCR:bag contents |
|
365 |
" |
|
366 |
||
367 |
"Created: / 11.11.1999 / 10:28:36 / stefan" |
|
368 |
! |
|
369 |
||
370 |
nextMatchFor: aNumber |
|
371 |
"generate the next random, return true iff it has the same |
|
372 |
value as aNumber. Redefined to avoid endless reading." |
|
373 |
||
1840 | 374 |
^ self next = aNumber |
1606 | 375 |
|
376 |
"Created: / 11.11.1999 / 10:29:32 / stefan" |
|
377 |
! ! |
|
378 |
||
379 |
!RandomGenerator methodsFor:'writing'! |
|
380 |
||
381 |
nextPut:something |
|
382 |
"change the random pool by feeding in something. |
|
383 |
Something should be some unpredictable, random event. |
|
384 |
Ignored here" |
|
385 |
||
386 |
||
387 |
! |
|
388 |
||
389 |
nextPutAll:something |
|
390 |
"change the random pool by feeding in something. |
|
391 |
Something should be some unpredictable, random event. |
|
392 |
Ignored here" |
|
393 |
||
394 |
! ! |
|
395 |
||
396 |
!RandomGenerator class methodsFor:'documentation'! |
|
397 |
||
398 |
version |
|
2439
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
399 |
^ '$Header: /cvs/stx/stx/libbasic2/RandomGenerator.st,v 1.7 2010-03-30 13:39:21 stefan Exp $' |
2432 | 400 |
! |
401 |
||
402 |
version_CVS |
|
2439
8ef4ad63fb9b
comment/format in: #nextBoolean
Stefan Vogel <sv@exept.de>
parents:
2438
diff
changeset
|
403 |
^ '$Header: /cvs/stx/stx/libbasic2/RandomGenerator.st,v 1.7 2010-03-30 13:39:21 stefan Exp $' |
1606 | 404 |
! ! |
405 |
||
406 |
RandomGenerator initialize! |