author | Jan Vrany <jan.vrany@fit.cvut.cz> |
Sat, 24 Oct 2009 16:48:19 +0100 | |
branch | jv |
changeset 17732 | a1892eeca6c0 |
parent 17728 | bbc5fa73dfab |
child 17734 | 406b1590afe8 |
permissions | -rw-r--r-- |
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" |
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COPYRIGHT (c) 1999 by eXept Software AG |
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All Rights Reserved |
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This software is furnished under a license and may be used |
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only in accordance with the terms of that license and with the |
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inclusion of the above copyright notice. This software may not |
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be provided or otherwise made available to, or used by, any |
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other person. No title to or ownership of the software is |
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hereby transferred. |
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" |
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"{ Package: 'stx:libbasic' }" |
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Stream subclass:#HashStream |
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instanceVariableNames:'' |
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classVariableNames:'' |
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poolDictionaries:'' |
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category:'System-Crypt-Streams' |
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! |
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!HashStream class methodsFor:'documentation'! |
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copyright |
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" |
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COPYRIGHT (c) 1999 by eXept Software AG |
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All Rights Reserved |
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This software is furnished under a license and may be used |
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only in accordance with the terms of that license and with the |
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inclusion of the above copyright notice. This software may not |
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be provided or otherwise made available to, or used by, any |
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other person. No title to or ownership of the software is |
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hereby transferred. |
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" |
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! |
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documentation |
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Abstract class. Subclasses generate hash values used as checksums |
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or for generating cryptographic signatures. |
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[author:] |
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Stefan Vogel |
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[see also:] |
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SHA1Stream MD5Stream |
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! ! |
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!HashStream class methodsFor:'instance creation'! |
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new |
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"have to re-allow new - it was disabled in Stream" |
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^ self basicNew initialize |
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! |
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random |
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"create a random number generator using myself" |
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^ HashRandom with:self |
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SHA1Stream random next |
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"Modified: / 12.11.1999 / 17:21:17 / stefan" |
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! ! |
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!HashStream class methodsFor:'compatibility - squeak'! |
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hashMessage:aStringOrByteArrayOrStream |
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"SQUEAK compatibility |
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- but this is a bad choice - squeak uses #digestMessage: at the instance side" |
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^ self hashValueOf:aStringOrByteArrayOrStream |
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! ! |
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!HashStream class methodsFor:'queries'! |
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canStream |
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"simple hash functions (squeak-ported) cannot stream. |
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Use hashFunction: there" |
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^ true |
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! ! |
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!HashStream class methodsFor:'self tests'! |
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test |
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"test against testVector" |
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self testVector do:[:pair | |
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|data expectedHash hashStream| |
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data := pair first. |
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expectedHash := pair second. |
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self canStream ifTrue:[ |
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hashStream := self new. |
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hashStream nextPut:data. |
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hashStream hashValue ~= expectedHash ifTrue:[ |
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self error:'Test failed' |
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]. |
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]. |
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"/ non-stream interface must be implemented by all |
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(self hashValueOf:data) ~= expectedHash ifTrue:[ |
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self error:'Test failed' |
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]. |
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]. |
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" |
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MD5Stream test. |
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SHA1Stream test. |
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RipeMD160Stream test. |
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! |
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testVector |
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"define a testvector to test the implementation" |
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^ self subclassResponsibility |
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! ! |
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!HashStream class methodsFor:'utilities'! |
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digestMessage:aStringOrByteArrayOrStream |
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^ self hashValueOf:aStringOrByteArrayOrStream |
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! |
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hashValueOf:aStringOrByteArrayOrStream |
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|hashStream| |
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hashStream := self new. |
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aStringOrByteArrayOrStream readStream copyToEndInto:hashStream. |
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^ hashStream hashValue |
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MD5Stream hashValueOf:'BlaBlaBla' |
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MD5Stream hashValueOf:('makefile' asFilename readStream) |
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MD5Stream hashValueOf:('BlaBlaBla' readStream) |
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hashValueOfFile:aFilename |
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|hash| |
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aFilename asFilename readingFileDo:[:readStream| |
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readStream binary. |
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hash := self hashValueOf:readStream. |
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]. |
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^ hash |
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MD5Stream hashValueOfFile:'makefile' |
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! ! |
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!HashStream methodsFor:'accessing'! |
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contents |
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"return the entire contents of the stream |
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- this is our hashValue." |
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^ self hashValue |
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"Created: / 17.3.1999 / 15:10:03 / stefan" |
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! ! |
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!HashStream methodsFor:'not implemented'! |
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next |
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^ self shouldNotImplement |
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"Created: / 17.3.1999 / 15:11:03 / stefan" |
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! ! |
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!HashStream methodsFor:'operations'! |
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digestMessage:bytes |
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"answer the digest of bytes" |
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self reset. |
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self nextPutAll:bytes. |
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^ self contents. |
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" |
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SHA1Stream new |
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digestMessage:'123456789abcdefg'; |
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digestMessage:'123456789abcdefg' |
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(SHA1Stream new hmac key:'123456') |
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digestMessage:'123456789abcdefg'; |
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digestMessage:'123456789abcdefg' |
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(SHA1Stream new hmac key:'123456') |
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nextPutAll:'123456789abcdefg'; |
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contents |
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" |
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! |
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hmac |
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"answer a hmac stream with myself" |
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^ HmacStream on:self |
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" |
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(SHA1Stream new hmac key:'exampleKey') digestMessage:'message to generate MAC of' |
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" |
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! |
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reset |
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"initialize to a clean state" |
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^ self subclassResponsibility |
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! ! |
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!HashStream methodsFor:'queries'! |
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blockSize |
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"the class knows about the basic block size" |
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^ self class blockSize |
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"Created: / 18.3.1999 / 10:17:02 / stefan" |
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! |
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hashSize |
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"the class knows about the basic hash size" |
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^ self class hashSize |
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"Created: / 18.3.1999 / 10:17:12 / stefan" |
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"Modified: / 15.10.1999 / 11:53:20 / stefan" |
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! |
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hashValue |
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"retunr the value of the computeted hash" |
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^ self subclassResponsibility |
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! |
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isReadable |
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"return true, if reading is supported by the recevier. |
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Always return false here" |
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^ false |
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"Modified: / 17.3.1999 / 15:06:09 / stefan" |
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! |
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isWritable |
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"return true, if writing is supported by the recevier. |
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Always return true here" |
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^ true |
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"Created: / 17.3.1999 / 15:05:49 / stefan" |
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! ! |
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!HashStream methodsFor:'testing'! |
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atEnd |
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"return true if the end of the stream has been reached; |
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this is never reached" |
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^ false |
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"Created: / 17.3.1999 / 15:08:55 / stefan" |
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! ! |
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!HashStream methodsFor:'writing'! |
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7042 | 278 |
nextPut:anObject |
279 |
"add the hash of anObject to the computed hash so far. |
|
280 |
anObject can be a Character, SmallInteger, or Character-, Byte- |
|
281 |
Integer-Array" |
|
282 |
||
283 |
^ self subclassResponsibility |
|
284 |
! |
|
285 |
||
6864 | 286 |
nextPutAll:aCollection |
287 |
"Hash streams handle Strings and ByteArrays in nextPut:" |
|
288 |
||
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289 |
aCollection isByteCollection ifTrue:[ |
6864 | 290 |
self nextPut:aCollection. |
291 |
] ifFalse:[ |
|
292 |
super nextPutAll:aCollection |
|
293 |
]. |
|
294 |
||
295 |
"Created: / 14.10.1999 / 11:22:50 / stefan" |
|
7042 | 296 |
! |
297 |
||
298 |
nextPutBytes:count from:anObject startingAt:start |
|
299 |
"write count bytes from an object starting at index start. |
|
300 |
Return the number of bytes written. |
|
301 |
The object must have non-pointer indexed instvars |
|
302 |
(i.e. be a ByteArray, String, Float- or DoubleArray). |
|
303 |
Use with care - non object oriented i/o. |
|
304 |
This is provided for compatibility with externalStream; |
|
305 |
to support binary storage. |
|
306 |
||
7251 | 307 |
Redefined, because HashStream encodes integers as 4 bytes. |
7042 | 308 |
You should implement this method in subclasses" |
309 |
||
310 |
|idx| |
|
311 |
||
312 |
"self subclassResponsibility" |
|
313 |
||
314 |
idx := start. |
|
315 |
1 to:count do:[:i | |
|
316 |
self nextPut:(anObject byteAt:idx) asCharacter. |
|
317 |
idx := idx + 1 |
|
318 |
]. |
|
319 |
^ count |
|
6864 | 320 |
! ! |
321 |
||
322 |
!HashStream class methodsFor:'documentation'! |
|
323 |
||
324 |
version |
|
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|
325 |
^ '$Id: HashStream.st 10473 2009-10-24 15:48:19Z vranyj1 $' |
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|
326 |
! |
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|
327 |
|
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parents:
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|
328 |
version_CVS |
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329 |
^ '§Header: /cvs/stx/stx/libbasic/HashStream.st,v 1.11 2009/10/14 12:12:40 stefan Exp §' |
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! ! |
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|
331 |