8903
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"
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COPYRIGHT (c) 2005 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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"{ NameSpace: CharacterEncoderImplementations }"
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TwoByteEncoder subclass:#ISO10646_to_UTF16BE
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instanceVariableNames:''
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classVariableNames:''
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poolDictionaries:''
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category:'Collections-Text-Encodings'
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!
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!ISO10646_to_UTF16BE class methodsFor:'documentation'!
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copyright
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"
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COPYRIGHT (c) 2005 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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"
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encodes/decodes UTF16 BigEndian (big-end-first)
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"
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!
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examples
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"
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Encoding (unicode to utf16BE)
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ISO10646_to_UTF16BE encodeString:'hello'.
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Decoding (utf16BE to unicode):
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|t|
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t := ISO10646_to_UTF16BE encodeString:''.
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ISO10646_to_UTF16BE decodeString:t.
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Decoding (utf16LE-Bytes to unicode):
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|bytes|
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bytes := #[ 16r40 0 16r41 0 16r42 0 16r43 0 16r44 0 ].
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ISO10646_to_UTF16LE decodeString:bytes.
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"
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! !
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!ISO10646_to_UTF16BE methodsFor:'encoding & decoding'!
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decode:aCode
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^ aCode
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!
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decodeString:aStringOrByteCollection
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"given a byteArray (2-bytes per character) or unsignedShortArra in UTF16 encoding,
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return a new string containing the same characters, in 8, 16bit (or more) encoding.
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Returns either a normal String, a TwoByte- or a FourByte-String instance.
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Only useful, when reading from external sources.
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This only handles up-to 30bit characters."
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|sz nBitsRequired s newString idx bitsPerElementIn nextIn
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codeIn codeIn1 codeIn2 estimatedSize out|
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aStringOrByteCollection isByteArray ifTrue:[
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bitsPerElementIn := 8.
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] ifFalse:[
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aStringOrByteCollection isString ifTrue:[
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bitsPerElementIn := aStringOrByteCollection bitsPerCharacter.
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] ifFalse:[
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bitsPerElementIn := 16.
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].
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].
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estimatedSize := aStringOrByteCollection size * bitsPerElementIn // 16.
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bitsPerElementIn == 8 ifTrue:[
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nextIn := [self nextTwoByteValueFrom:s].
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] ifFalse:[
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nextIn := [s next].
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].
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s := aStringOrByteCollection readStream.
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out := CharacterWriteStream on:(String new:estimatedSize).
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[s atEnd] whileFalse:[
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codeIn := nextIn value.
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codeIn <= 16rFF ifTrue:[
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] ifFalse:[
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(codeIn between:16rD800 and:16rDBFF) ifTrue:[
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codeIn1 := codeIn.
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codeIn2 := nextIn value.
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codeIn := ((codeIn1 - 16rD800) bitShift:10)
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+
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(codeIn2 - 16rDC00)
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+ 16r00010000.
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].
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].
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out nextPut:(Character value:codeIn).
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].
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newString := out contents.
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"/ nBitsRequired := 8.
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"/ sz := 0.
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"/ [s atEnd] whileFalse:[
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"/ codeIn := nextIn value.
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"/ sz := sz + 1.
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"/
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"/ codeIn <= 16rFF ifTrue:[
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"/ ] ifFalse:[
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"/ nBitsRequired := nBitsRequired max:16.
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"/ (codeIn between:16rD800 and:16rDBFF) ifTrue:[
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"/ nBitsRequired := 32.
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"/ codeIn2 := nextIn value.
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"/ ].
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"/ ]
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"/ ].
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"/
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"/ nBitsRequired == 8 ifTrue:[
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"/ newString := String uninitializedNew:sz
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"/ ] ifFalse:[
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"/ nBitsRequired <= 16 ifTrue:[
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"/ newString := Unicode16String new:sz
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"/ ] ifFalse:[
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"/ newString := Unicode32String new:sz
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"/ ]
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"/ ].
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"/
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"/ s := aStringOrByteCollection readStream.
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"/ idx := 1.
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"/ [s atEnd] whileFalse:[
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"/ codeIn := nextIn value.
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"/ codeIn <= 16rFF ifTrue:[
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"/ ] ifFalse:[
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"/ nBitsRequired := nBitsRequired max:16.
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"/ (codeIn between:16rD800 and:16rDBFF) ifTrue:[
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"/ nBitsRequired := 32.
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"/ codeIn1 := codeIn.
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"/ codeIn2 := nextIn value.
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"/ codeIn := ((codeIn1 - 16rD800) bitShift:10)
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"/ +
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"/ (codeIn2 - 16rDC00)
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"/ + 16r00010000.
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"/ ].
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"/ ].
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"/ newString at:idx put:(Character value:codeIn).
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"/ idx := idx + 1.
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"/ ].
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^ newString
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"
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self new decodeString:#[ 16r00 16r42 ]
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self new decodeString:#[ 16r01 16r42 ]
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self new decodeString:#[ 16r00 16r48
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16r00 16r69
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16rD8 16r00
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16rDC 16r00
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16r00 16r21
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16r00 16r21
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]
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self new decodeString:#( 16r0048
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16r0069
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16rD800
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16rDC00
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16r0021
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16r0021
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)
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"
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!
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encode:aCode
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^ aCode
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!
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encodeString:aUnicodeString
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"return the UTF-16 representation of a aUnicodeString.
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The resulting string is only useful to be stored on some external file,
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not for being used inside ST/X."
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|s|
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s := WriteStream on:(ByteArray uninitializedNew:aUnicodeString size).
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aUnicodeString do:[:eachCharacter |
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|codePoint t hi low|
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codePoint := eachCharacter codePoint.
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(codePoint <= 16rFFFF) ifTrue:[
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((codePoint <= 16rD7FF) or:[ codePoint between:16rE000 and:16rFFFF]) ifTrue:[
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self nextPutTwoByteValue:codePoint to:s.
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] ifFalse:[
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"/ unrepresentable: D800..DFFFF
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self error:'unrepresentable value (D800..DFFFF) in utf16Encode'.
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].
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] ifFalse:[
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t := codePoint - 16r00010000.
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hi := t bitShift:-10.
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low := t bitAnd:16r3FF.
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hi > 16r3FF ifTrue:[
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"/ unrepresentable: above 110000
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self error:'unrepresentable value (> 10FFFF) in utf16Encode'.
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].
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self nextPutTwoByteValue:(hi + 16rD800) to:s.
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self nextPutTwoByteValue:(low + 16rDC00) to:s.
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].
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].
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^ s contents
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"
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(self encodeString:'hello') #[0 104 0 101 0 108 0 108 0 111]
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(self encodeString:(Character value:16r40) asString) #[0 64]
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(self encodeString:(Character value:16rFF) asString) #[0 255]
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(self encodeString:(Character value:16r100) asString) #[1 0]
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(self encodeString:(Character value:16r1000) asString) #[16 0]
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(self encodeString:(Character value:16r2000) asString) #[32 0]
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(self encodeString:(Character value:16r4000) asString) #[64 0]
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(self encodeString:(Character value:16r8000) asString) #[128 0]
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(self encodeString:(Character value:16rD7FF) asString) #[215 255]
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(self encodeString:(Character value:16rE000) asString) #[224 0]
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(self encodeString:(Character value:16rFFFF) asString) #[255 255]
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(self encodeString:(Character value:16r10000) asString) #[216 64 220 0]
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(self encodeString:(Character value:16r10FFF) asString) #[216 67 223 255]
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(self encodeString:(Character value:16r1FFFF) asString) #[216 127 223 255]
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(self encodeString:(Character value:16r10FFFF) asString) #[219 255 223 255]
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error cases:
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(self encodeString:(Character value:16rD800) asString)
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(self encodeString:(Character value:16rD801) asString)
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(self encodeString:(Character value:16rDFFF) asString)
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(self encodeString:(Character value:16r110000) asString)
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"
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! !
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!ISO10646_to_UTF16BE methodsFor:'private'!
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nextPutTwoByteValue:anInteger to:aStream
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aStream nextPutShort:anInteger MSB:true
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!
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nextTwoByteValueFrom:aStream
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^ aStream nextUnsignedShortMSB:true
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! !
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!ISO10646_to_UTF16BE methodsFor:'queries'!
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nameOfEncoding
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^ #'utf8be'
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! !
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!ISO10646_to_UTF16BE class methodsFor:'documentation'!
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version
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^ '$Header: /cvs/stx/stx/libbasic/Encoder_ISO10646_to_UTF16BE.st,v 1.3 2009/11/04 00:46:08 cg Exp $'
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!
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version_CVS
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^ '§Header: /cvs/stx/stx/libbasic/Encoder_ISO10646_to_UTF16BE.st,v 1.3 2009/11/04 00:46:08 cg Exp §'
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!
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version_SVN
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^ '$Id: CharacterEncoderImplementations__ISO10646_to_UTF16BE.st 10761 2012-01-19 11:46:00Z vranyj1 $'
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! !
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