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1195
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"{ Package: 'stx:libbasic2' }"
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1059
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Stream subclass:#CompressionStream
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1193
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instanceVariableNames:'onStream hitEOF binary position readLimit mode inputBytes
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outputBytes zstream'
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classVariableNames:'BlockSize'
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poolDictionaries:''
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category:'System-Compress'
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1059
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!
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1193
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1059
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!CompressionStream class methodsFor:'initialization'!
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initialize
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BlockSize := 6.
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! !
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!CompressionStream class methodsFor:'instance creation'!
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1193
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openWithMode:modeSymbol on:aStream
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"open on aStream with mode modeSymbol (#readonly #writeonly)"
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^ self subclassResponsibility
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!
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1059
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readOpenOn:aStream
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"read data from an compressed stream
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"
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^ self basicNew openWithMode:#readonly on:aStream
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!
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writeOpenOn:aStream
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"write data compressed to stream
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"
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^ self basicNew openWithMode:#writeonly on:aStream
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! !
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!CompressionStream class methodsFor:'test'!
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1082
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doTestNextN
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"
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CompressionStream doTestNextN
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"
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|stream time file zipCont nxtCont|
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file := '/phys/exept/tmp/yyy/201--T22--D.20000415.SAGSA.DE0220523.gz' asFilename.
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file isReadable ifFalse:[^ self error:'not existant'].
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time := Time millisecondsToRun:[ |zipStream|
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1195
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zipStream := stream := zipCont := nil.
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[
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stream := file readStream.
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zipStream := ZipStream readOpenOn:stream.
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zipCont := zipStream contents.
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] valueNowOrOnUnwindDo:[
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zipStream notNil ifTrue:[zipStream close].
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stream notNil ifTrue:[stream close].
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].
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].
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Transcript showCR:('STX Time : %1 Size: %2' bindWith:time with:(zipCont size)).
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time := Time millisecondsToRun:[ |zipStream wstream|
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zipStream := stream := nxtCont := nil.
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[
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stream := file readStream.
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wstream := '' writeStream.
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zipStream := ZipStream readOpenOn:stream.
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1082
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1195
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[zipStream atEnd] whileFalse:[
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wstream nextPutAll:(zipStream next:117)
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].
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nxtCont := wstream contents.
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] valueNowOrOnUnwindDo:[
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zipStream notNil ifTrue:[zipStream close].
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stream notNil ifTrue:[stream close].
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].
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1082
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].
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Transcript showCR:('NEXT Time : %1 Size: %2' bindWith:time with:(nxtCont size)).
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nxtCont = zipCont ifTrue:[ Transcript showCR:'OK' ]
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1195
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ifFalse:[ self error:'contents differs' ].
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1082
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!
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doTestSkipN
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"
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CompressionStream doTestSkipN
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"
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|stream time file skpCont nxtCont skip|
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file := '/phys/exept/tmp/yyy/201--T22--D.20000415.SAGSA.DE0220523.gz' asFilename.
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file isReadable ifFalse:[^ self error:'not existant'].
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skip := 6885379.
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time := Time millisecondsToRun:[ |zipStream wstream|
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zipStream := stream := nxtCont := nil.
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[
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stream := file readStream.
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wstream := '' writeStream.
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zipStream := ZipStream readOpenOn:stream.
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skip timesRepeat:[ zipStream next ].
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1082
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1195
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[zipStream atEnd] whileFalse:[
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wstream nextPutAll:(zipStream next:117)
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].
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nxtCont := wstream contents.
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] valueNowOrOnUnwindDo:[
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zipStream notNil ifTrue:[zipStream close].
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stream notNil ifTrue:[stream close].
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].
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1082
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].
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112 |
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Transcript showCR:('STX Time : %1 Size: %2' bindWith:time with:(nxtCont size)).
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time := Time millisecondsToRun:[ |zipStream wstream|
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zipStream := stream := skpCont := nil.
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[
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stream := file readStream.
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wstream := '' writeStream.
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zipStream := ZipStream readOpenOn:stream.
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zipStream skip:skip.
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[zipStream atEnd] whileFalse:[
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wstream nextPutAll:(zipStream next:117)
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].
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skpCont := wstream contents.
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] valueNowOrOnUnwindDo:[
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zipStream notNil ifTrue:[zipStream close].
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stream notNil ifTrue:[stream close].
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].
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1082
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].
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Transcript showCR:('NEXT Time : %1 Size: %2' bindWith:time with:(skpCont size)).
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nxtCont = skpCont ifTrue:[ Transcript showCR:'OK' ]
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1195
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ifFalse:[ self error:'contents differs' ].
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1082
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135 |
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!
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doTestUnixAgainstClass
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"
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CompressionStream doTestUnixAgainstClass
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"
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1080
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|stream time file zipCont cmdCont|
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143 |
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file := '/phys/exept/tmp/yyy/201--T22--D.20000415.SAGSA.DE0220523.gz' asFilename.
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file isReadable ifFalse:[^ self error:'not existant'].
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146 |
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time := Time millisecondsToRun:[ |zipStream|
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1195
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148 |
zipStream := stream := zipCont := nil.
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[
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stream := file readStream.
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zipStream := ZipStream readOpenOn:stream.
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zipCont := zipStream contents.
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] valueNowOrOnUnwindDo:[
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zipStream notNil ifTrue:[zipStream close].
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stream notNil ifTrue:[stream close].
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].
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1080
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].
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Transcript showCR:('STX Time : %1 Size: %2' bindWith:time with:(zipCont size)).
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159 |
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time := Time millisecondsToRun:[ |command|
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1195
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161 |
cmdCont := stream := nil.
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162 |
[
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command := 'gunzip < ' , file pathName.
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stream := PipeStream readingFrom:command.
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cmdCont := stream contentsOfEntireFile.
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1080
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166 |
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1195
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167 |
] valueNowOrOnUnwindDo:[
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stream notNil ifTrue:[stream close].
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]
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1080
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].
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Transcript showCR:('UNIX Time : %1 Size: %2' bindWith:time with:(cmdCont size)).
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172 |
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cmdCont = zipCont ifTrue:[ Transcript showCR:'OK' ]
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1195
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ifFalse:[ self error:'contents differs' ].
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1080
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175 |
!
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176 |
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1059
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177 |
test
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178 |
"
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179 |
CompressionStream test
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180 |
"
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181 |
|original compressed contents in out zip|
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182 |
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original := 'smalltalk.rc' asFilename contentsOfEntireFile.
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184 |
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in := original readStream.
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186 |
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[ |b|
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1195
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out := #[] writeStream.
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zip := self writeOpenOn:out.
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1059
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190 |
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1195
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[in atEnd] whileFalse:[
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(b := in next) ifNotNil:[zip nextPut:b]
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]
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1059
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] valueNowOrOnUnwindDo:[ zip ifNotNil:[ zip close ] ].
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195 |
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196 |
compressed := out contents.
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197 |
[ |b|
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1195
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zip := self readOpenOn:(compressed readStream).
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out := '' writeStream.
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1059
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200 |
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1195
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[ (b := zip next) notNil ] whileTrue:[ out nextPut:b ]
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1059
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202 |
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203 |
] valueNowOrOnUnwindDo:[
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1195
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zip ifNotNil:[ zip close ].
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205 |
contents := out contents.
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1059
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206 |
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1195
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207 |
Transcript showCR:(contents size).
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208 |
Transcript showCR:(compressed size).
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1059
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].
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210 |
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original = contents ifFalse:[
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1195
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self halt:'contents differs'.
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1059
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^ self
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].
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215 |
Transcript showCR:'OK'.
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!
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217 |
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218 |
testFile
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"
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220 |
CompressionStream testFile
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221 |
"
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222 |
|fileContents in zip out gzipCmd|
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223 |
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fileContents := 'smalltalk.rc' asFilename contentsOfEntireFile.
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225 |
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in := fileContents readStream.
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out := FileStream newFileNamed:'YYY.gz'.
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out ifNil:[ ^ self ].
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229 |
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230 |
[ zip := self writeOpenOn:out.
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231 |
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232 |
[in atEnd] whileFalse:[ |buf|
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1195
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buf := in nextAvailable:512.
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234 |
buf do:[:n|
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zip nextPut:n
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]
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1059
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].
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] valueNowOrOnUnwindDo:[
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1195
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239 |
zip ifNotNil:[ zip close ].
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out close.
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1059
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].
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gzipCmd := 'gzip -dc YYY.gz > YYY; diff YYY smalltalk.rc'.
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243 |
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Transcript showCR:gzipCmd.
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gzipCmd printCR.
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! !
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247 |
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248 |
!CompressionStream methodsFor:'accessing'!
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249 |
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binary
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"switch to binary mode - default is text
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"
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binary := true.
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!
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255 |
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256 |
text
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1193
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257 |
"switch to text mode - default is text"
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258 |
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1059
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259 |
binary := false.
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260 |
! !
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261 |
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!CompressionStream methodsFor:'error handling'!
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263 |
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264 |
errorNotOpen
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1193
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265 |
"report an error, that the stream has not been opened"
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266 |
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1059
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267 |
self zerror:'not open'.
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268 |
!
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269 |
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270 |
errorReadOnly
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1193
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271 |
"report an error, that the stream is a readOnly stream"
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272 |
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1059
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273 |
self zerror:'is readonly'
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!
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275 |
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276 |
errorWriteOnly
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1193
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277 |
"report an error, that the stream is a writeOnly stream"
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278 |
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1059
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279 |
self zerror:'is writeonly'
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280 |
!
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281 |
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282 |
invalidArgument
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1193
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283 |
"called if a method is invoked with invalid parameters"
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284 |
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1059
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285 |
self zerror:'invalid arguments'.
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286 |
!
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287 |
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288 |
pastEnd
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self zerror:'end of stream'.
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290 |
!
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291 |
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zerror:anError
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293 |
|error|
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294 |
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295 |
zstream isNil ifTrue:[
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1195
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296 |
error := 'not open'.
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1059
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297 |
] ifFalse:[
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1195
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298 |
anError isNumber ifTrue:[
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299 |
anError == 1 ifTrue:[ error := 'stream at end' ]
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300 |
ifFalse:[anError == -1 ifTrue:[ error := 'processing error: ', anError printString ]
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301 |
ifFalse:[anError == -2 ifTrue:[ error := 'processing error' ]
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302 |
ifFalse:[anError == -3 ifTrue:[ error := 'input data are corrupted' ]
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303 |
ifFalse:[anError == -4 ifTrue:[ error := 'not enough memory' ]
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304 |
ifFalse:[anError == -5 ifTrue:[ error := 'not enough memory in the output stream' ]
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305 |
ifFalse:[anError == -6 ifTrue:[ error := 'version error' ]
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306 |
ifFalse:[
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307 |
error := 'compressing error: ', anError printString
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|
308 |
]]]]]]].
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309 |
] ifFalse:[
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310 |
error := anError printString
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311 |
].
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1059
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312 |
].
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1061
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313 |
self closeZStream.
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1059
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314 |
Stream streamErrorSignal raiseErrorString:(self class name , ': ', error).
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315 |
! !
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316 |
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317 |
!CompressionStream methodsFor:'finalization'!
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318 |
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319 |
executor
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320 |
"redefined to return a lightweight copy
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1193
|
321 |
- all we need is the memory handle"
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322 |
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1059
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323 |
^ self class basicNew finalizeCopy:zstream.
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324 |
!
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325 |
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326 |
finalize
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1061
|
327 |
"the compressin-stream was garbage collected;
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1193
|
328 |
close the underlying zip-stream"
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329 |
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1061
|
330 |
self closeZStream.
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1059
|
331 |
!
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|
332 |
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333 |
finalizeCopy:aZStream
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1193
|
334 |
"used for finalization to close the underlying zip-stream"
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|
335 |
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1059
|
336 |
zstream := aZStream.
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|
337 |
! !
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|
338 |
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|
339 |
!CompressionStream methodsFor:'low level'!
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|
340 |
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1079
|
341 |
z_nextAvailableInto:aCollection startingAt:offset
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|
342 |
"read the next available bytes into a collection, a string or byteArray;
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1193
|
343 |
returns the size read"
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|
344 |
|
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1079
|
345 |
|start count avail|
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346 |
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|
347 |
avail := readLimit - position.
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|
348 |
avail > 0 ifFalse:[^ 0].
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|
349 |
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|
350 |
count := aCollection size - offset + 1.
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|
351 |
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|
352 |
count > 0 ifFalse:[
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1195
|
353 |
count < 0 ifTrue:[
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|
354 |
self zerror:'invalid arguments'
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|
355 |
].
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|
356 |
^ 0
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|
1079
|
357 |
].
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|
358 |
count := avail min:count.
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|
359 |
start := position.
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|
360 |
position := position + count.
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|
361 |
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|
362 |
%{ unsigned char * _dstPt;
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|
363 |
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|
364 |
if( __isBytes(aCollection) ) {
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1195
|
365 |
_dstPt = (unsigned char *) (__ByteArrayInstPtr(aCollection)->ba_element);
|
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1079
|
366 |
} else if (__isString(aCollection)) {
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1195
|
367 |
_dstPt = (unsigned char *) (__stringVal( aCollection));
|
|
1079
|
368 |
} else
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1195
|
369 |
_dstPt = (unsigned char *) 0;
|
|
1079
|
370 |
|
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|
371 |
if( _dstPt )
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|
372 |
{
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1195
|
373 |
int _loop, _count, _offset;
|
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|
374 |
unsigned char * _srcPt;
|
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|
375 |
OBJ _srcObj = __INST( outputBytes );
|
|
1079
|
376 |
|
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1195
|
377 |
_offset = __intVal( offset );
|
|
|
378 |
_dstPt = _dstPt + _offset - 1;
|
|
1079
|
379 |
|
|
1195
|
380 |
_srcPt = (unsigned char *) __externalBytesAddress( _srcObj );
|
|
|
381 |
_srcPt += __intVal( start );
|
|
|
382 |
_count = __intVal( count );
|
|
1079
|
383 |
|
|
1195
|
384 |
for( _loop = 0; _loop < _count; ++_loop )
|
|
|
385 |
* _dstPt++ = * _srcPt++;
|
|
1079
|
386 |
|
|
1195
|
387 |
RETURN(__MKSMALLINT(_count));
|
|
1079
|
388 |
}
|
|
|
389 |
%}.
|
|
|
390 |
|
|
|
391 |
^ self zerror:'invalid argument'
|
|
|
392 |
!
|
|
|
393 |
|
|
1193
|
394 |
zclose
|
|
|
395 |
"low level close of the zip stream"
|
|
|
396 |
|
|
|
397 |
^ self subclassResponsibility
|
|
|
398 |
!
|
|
|
399 |
|
|
|
400 |
zdeflate
|
|
|
401 |
"low level - deflate
|
|
|
402 |
returns false if the deflate operation is finished otherwise true"
|
|
|
403 |
|
|
|
404 |
^ self subclassResponsibility
|
|
|
405 |
!
|
|
|
406 |
|
|
|
407 |
zdeflateInit
|
|
|
408 |
"low level - deflateInit
|
|
|
409 |
initialize the deflate mode, write header"
|
|
|
410 |
|
|
|
411 |
^ self subclassResponsibility
|
|
|
412 |
!
|
|
|
413 |
|
|
|
414 |
zget_avail_out
|
|
|
415 |
"low level - get the number of available out bytes"
|
|
|
416 |
|
|
|
417 |
^ self subclassResponsibility
|
|
|
418 |
!
|
|
|
419 |
|
|
|
420 |
zinflate
|
|
|
421 |
"low level - inflate
|
|
|
422 |
returns nil if at uncompress is finished, or the number of
|
|
|
423 |
available bytes in the output-buffer"
|
|
|
424 |
|
|
|
425 |
^ self subclassResponsibility
|
|
|
426 |
!
|
|
|
427 |
|
|
|
428 |
zinflateInit
|
|
|
429 |
"low level - inflateInit
|
|
|
430 |
initialize the inflate mode, read and check header"
|
|
|
431 |
|
|
|
432 |
^ self subclassResponsibility
|
|
|
433 |
!
|
|
|
434 |
|
|
1059
|
435 |
zopen
|
|
|
436 |
"low level - opens the zip stream
|
|
1193
|
437 |
create the resources"
|
|
|
438 |
|
|
1059
|
439 |
^ self subclassResponsibility
|
|
|
440 |
!
|
|
|
441 |
|
|
|
442 |
zset_avail_in:count
|
|
1193
|
443 |
"set the 'avail_in' and compute the crc"
|
|
|
444 |
|
|
1059
|
445 |
^ self subclassResponsibility
|
|
|
446 |
! !
|
|
|
447 |
|
|
|
448 |
!CompressionStream methodsFor:'private'!
|
|
|
449 |
|
|
1061
|
450 |
closeZStream
|
|
1193
|
451 |
"close the zip-stream"
|
|
|
452 |
|
|
1061
|
453 |
onStream := mode := nil.
|
|
|
454 |
hitEOF := true.
|
|
|
455 |
|
|
|
456 |
zstream ifNotNil:[
|
|
1195
|
457 |
self unregisterForFinalization.
|
|
|
458 |
self zclose.
|
|
|
459 |
zstream := nil.
|
|
1061
|
460 |
].
|
|
|
461 |
!
|
|
|
462 |
|
|
1081
|
463 |
contentsSpecies
|
|
1193
|
464 |
"return the kind of object to be returned by sub-collection builders"
|
|
|
465 |
|
|
|
466 |
binary == true ifTrue:[^ ByteArray].
|
|
|
467 |
^ String
|
|
1081
|
468 |
!
|
|
|
469 |
|
|
1059
|
470 |
onStreamPutBytes:count from:data
|
|
1193
|
471 |
"write compressed data to the (output) stream"
|
|
|
472 |
|
|
|
473 |
onStream isNil ifTrue:[self errorNotOpen].
|
|
1059
|
474 |
onStream nextPutBytes:count from:data startingAt:1
|
|
|
475 |
! !
|
|
|
476 |
|
|
|
477 |
!CompressionStream methodsFor:'queries'!
|
|
|
478 |
|
|
|
479 |
atEnd
|
|
1193
|
480 |
"return true if the end of the compressed input stream has been reached"
|
|
|
481 |
|
|
1059
|
482 |
^ hitEOF ~~ false
|
|
|
483 |
!
|
|
|
484 |
|
|
1062
|
485 |
canReadWithoutBlocking
|
|
|
486 |
"returns true if data are available for reading;
|
|
|
487 |
false if the stream is at end.
|
|
1193
|
488 |
updates the readLimit and position"
|
|
|
489 |
|
|
1062
|
490 |
mode == #readonly ifFalse:[
|
|
1195
|
491 |
self errorReadOnly
|
|
1062
|
492 |
].
|
|
|
493 |
hitEOF == true ifTrue:[ ^ false ].
|
|
|
494 |
|
|
|
495 |
position >= readLimit ifTrue:[
|
|
1195
|
496 |
[ (readLimit := self zinflate) == 0 ] whileTrue:[ |n|
|
|
|
497 |
n := onStream nextBytes:(inputBytes size) into:inputBytes startingAt:1.
|
|
1062
|
498 |
|
|
1195
|
499 |
(n notNil and:[n > 0]) ifFalse:[
|
|
|
500 |
self pastEnd
|
|
|
501 |
].
|
|
|
502 |
self zset_avail_in:n.
|
|
|
503 |
].
|
|
|
504 |
readLimit ifNil:[
|
|
|
505 |
hitEOF := true.
|
|
|
506 |
^ false
|
|
|
507 |
].
|
|
|
508 |
position := 0.
|
|
1062
|
509 |
].
|
|
|
510 |
^ true
|
|
|
511 |
!
|
|
|
512 |
|
|
1059
|
513 |
isBinary
|
|
|
514 |
"return true, if the stream is in binary (as opposed to text-) mode.
|
|
1193
|
515 |
The default when created is false"
|
|
|
516 |
|
|
1059
|
517 |
^ binary
|
|
|
518 |
!
|
|
|
519 |
|
|
|
520 |
isOpen
|
|
1193
|
521 |
"return true, if this stream is open"
|
|
|
522 |
|
|
1059
|
523 |
^ onStream notNil
|
|
|
524 |
!
|
|
|
525 |
|
|
1193
|
526 |
isReadable
|
|
|
527 |
"return true, if this stream can be read from"
|
|
|
528 |
|
|
1059
|
529 |
^ mode == #readonly
|
|
|
530 |
!
|
|
|
531 |
|
|
1193
|
532 |
isWritable
|
|
|
533 |
"return true, if this stream can be written to"
|
|
|
534 |
|
|
1059
|
535 |
^ mode == #writeonly
|
|
|
536 |
! !
|
|
|
537 |
|
|
|
538 |
!CompressionStream methodsFor:'reading'!
|
|
|
539 |
|
|
|
540 |
contents
|
|
1193
|
541 |
"return the entire contents of and close the stream"
|
|
|
542 |
|
|
1081
|
543 |
|species stream bfsize buffer count|
|
|
1059
|
544 |
|
|
|
545 |
mode == #readonly ifFalse:[ self errorReadOnly ].
|
|
1062
|
546 |
bfsize := outputBytes size.
|
|
1059
|
547 |
|
|
1081
|
548 |
species := self contentsSpecies.
|
|
|
549 |
buffer := species new:bfsize.
|
|
|
550 |
stream := (species new:bfsize) writeStream.
|
|
1079
|
551 |
|
|
|
552 |
[ self canReadWithoutBlocking ] whileTrue:[
|
|
1195
|
553 |
count := self z_nextAvailableInto:buffer startingAt:1.
|
|
1079
|
554 |
|
|
1195
|
555 |
count == bfsize ifTrue:[
|
|
|
556 |
stream nextPutAll:buffer.
|
|
|
557 |
] ifFalse:[
|
|
|
558 |
count > 0 ifTrue:[
|
|
|
559 |
stream nextPutAll:(buffer copyFrom:1 to:count)
|
|
|
560 |
]
|
|
|
561 |
].
|
|
1059
|
562 |
].
|
|
1062
|
563 |
self close.
|
|
1193
|
564 |
^ stream contents
|
|
1059
|
565 |
!
|
|
|
566 |
|
|
|
567 |
next
|
|
|
568 |
"return the next element, a character or byte (textmode)
|
|
1193
|
569 |
return nil, if there are no more elements"
|
|
|
570 |
|
|
1059
|
571 |
|byte|
|
|
|
572 |
|
|
1062
|
573 |
self canReadWithoutBlocking ifFalse:[
|
|
1195
|
574 |
"there is no more element; the stream is at end"
|
|
|
575 |
^ nil
|
|
1059
|
576 |
].
|
|
|
577 |
position := position + 1.
|
|
|
578 |
byte := outputBytes at:position.
|
|
|
579 |
|
|
|
580 |
binary ifTrue:[^ byte ].
|
|
1193
|
581 |
^ Character value:byte
|
|
1082
|
582 |
!
|
|
|
583 |
|
|
|
584 |
next:n
|
|
|
585 |
"return the next count elements of the stream as a collection.
|
|
1193
|
586 |
Redefined to return a String or ByteArray and for optimization"
|
|
|
587 |
|
|
1082
|
588 |
|data count offset species|
|
|
|
589 |
|
|
|
590 |
species := self contentsSpecies.
|
|
|
591 |
|
|
|
592 |
self canReadWithoutBlocking ifFalse:[
|
|
1195
|
593 |
^ species new
|
|
1082
|
594 |
].
|
|
|
595 |
data := species new:n.
|
|
|
596 |
offset := 1.
|
|
|
597 |
|
|
1193
|
598 |
[self canReadWithoutBlocking] whileTrue:[
|
|
1195
|
599 |
count := self z_nextAvailableInto:data startingAt:offset.
|
|
|
600 |
offset := count + offset.
|
|
|
601 |
offset > n ifTrue:[^ data]
|
|
1082
|
602 |
].
|
|
|
603 |
^ data copyFrom:1 to:(offset - 1)
|
|
|
604 |
!
|
|
|
605 |
|
|
|
606 |
skip:count
|
|
|
607 |
"skip count objects, return the receiver
|
|
1193
|
608 |
redefined for optimization"
|
|
|
609 |
|
|
1082
|
610 |
|n avail|
|
|
|
611 |
|
|
|
612 |
n := count.
|
|
|
613 |
|
|
1193
|
614 |
n <= 0 ifTrue:[
|
|
1195
|
615 |
n ~~ 0 ifTrue:[
|
|
|
616 |
"dont know how to unread ..."
|
|
|
617 |
PositionErrorSignal raiseRequest
|
|
|
618 |
].
|
|
|
619 |
^ self
|
|
1083
|
620 |
].
|
|
|
621 |
|
|
1193
|
622 |
[self canReadWithoutBlocking] whileTrue:[
|
|
1195
|
623 |
avail := readLimit - position.
|
|
1082
|
624 |
|
|
1195
|
625 |
avail >= n ifTrue:[
|
|
|
626 |
position := position + n.
|
|
|
627 |
^ self
|
|
|
628 |
].
|
|
|
629 |
position := readLimit := 0. "/ reset input
|
|
|
630 |
n := n - avail.
|
|
1082
|
631 |
].
|
|
1059
|
632 |
! !
|
|
|
633 |
|
|
|
634 |
!CompressionStream methodsFor:'startup & release'!
|
|
|
635 |
|
|
|
636 |
close
|
|
1193
|
637 |
"close the zip-stream"
|
|
|
638 |
|
|
1059
|
639 |
hitEOF := true.
|
|
1193
|
640 |
zstream notNil ifTrue:[
|
|
1195
|
641 |
self flush.
|
|
|
642 |
self closeZStream.
|
|
1059
|
643 |
].
|
|
|
644 |
!
|
|
|
645 |
|
|
|
646 |
openWithMode:aMode on:aStream
|
|
1061
|
647 |
"open the zip-stream on a stream
|
|
1195
|
648 |
#readonly uncompress the data derived from the read-stream, aStream
|
|
|
649 |
#writeonly compress the data and write to the write-stream, aStream
|
|
1061
|
650 |
"
|
|
1059
|
651 |
(onStream := aStream) ifNil:[ self errorNotOpen ].
|
|
|
652 |
|
|
|
653 |
mode := aMode.
|
|
|
654 |
outputBytes := ExternalBytes unprotectedNew:8192.
|
|
|
655 |
inputBytes := ExternalBytes unprotectedNew:8192.
|
|
|
656 |
readLimit := position := 0.
|
|
|
657 |
binary := false.
|
|
|
658 |
|
|
|
659 |
self zopen.
|
|
|
660 |
self registerForFinalization.
|
|
|
661 |
|
|
|
662 |
hitEOF := false.
|
|
|
663 |
|
|
|
664 |
aMode == #readonly ifTrue:[
|
|
1195
|
665 |
self zinflateInit.
|
|
1059
|
666 |
] ifFalse:[
|
|
1195
|
667 |
self zdeflateInit
|
|
1059
|
668 |
].
|
|
|
669 |
! !
|
|
|
670 |
|
|
|
671 |
!CompressionStream methodsFor:'writing'!
|
|
|
672 |
|
|
1062
|
673 |
contents:contents
|
|
1193
|
674 |
"write the entire contents to and close the stream"
|
|
|
675 |
|
|
|
676 |
contents do:[:c| self nextPut:c].
|
|
1062
|
677 |
self close.
|
|
|
678 |
!
|
|
|
679 |
|
|
1059
|
680 |
flush
|
|
1193
|
681 |
"flush the input and output buffer"
|
|
|
682 |
|
|
1059
|
683 |
|continue|
|
|
|
684 |
|
|
1193
|
685 |
self isWritable ifFalse:[ ^ self ].
|
|
1059
|
686 |
self zset_avail_in:position.
|
|
|
687 |
|
|
|
688 |
position := 0.
|
|
|
689 |
continue := true.
|
|
|
690 |
|
|
|
691 |
[continue] whileTrue:[ |count|
|
|
1195
|
692 |
count := self zget_avail_out.
|
|
1059
|
693 |
|
|
1195
|
694 |
count > 0 ifTrue:[
|
|
|
695 |
self onStreamPutBytes:count from:outputBytes
|
|
|
696 |
].
|
|
|
697 |
continue := self zdeflate.
|
|
1059
|
698 |
].
|
|
|
699 |
!
|
|
|
700 |
|
|
1193
|
701 |
nextPut:aByteOrCharacter
|
|
|
702 |
"write the argument, aByteOrCharacter"
|
|
1059
|
703 |
|
|
1193
|
704 |
position == inputBytes size ifTrue:[self flush].
|
|
|
705 |
position := position + 1.
|
|
|
706 |
inputBytes at:position put:aByteOrCharacter asInteger.
|
|
|
707 |
! !
|
|
1059
|
708 |
|
|
1193
|
709 |
!CompressionStream class methodsFor:'documentation'!
|
|
1059
|
710 |
|
|
1193
|
711 |
version
|
|
1195
|
712 |
^ '$Header: /cvs/stx/stx/libbasic2/CompressionStream.st,v 1.10 2003-05-06 16:19:20 stefan Exp $'
|
|
1059
|
713 |
! !
|
|
|
714 |
|
|
|
715 |
CompressionStream initialize!
|