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"{ Package: 'stx:libbasic2' }"
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Object subclass:#WindowsCompoundBinaryFileReader
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instanceVariableNames:'inStream fileType streamTypes client msb'
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classVariableNames:'UnsupportedFormatErrorSignal'
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poolDictionaries:''
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category:'System-Support-FileFormats'
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!
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!WindowsCompoundBinaryFileReader class methodsFor:'documentation'!
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documentation
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"
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compoundBinary is actually (kind of) the FAT Disk format in a file.
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It is very old, but still used by visio (vsd) files.
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CompoundBinary is actually a container format.
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Warning:
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ongoing, unfinished work.
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"
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! !
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!WindowsCompoundBinaryFileReader class methodsFor:'instance creation'!
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fromFile:aFilename
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|s reader|
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s := aFilename asFilename readStream.
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reader := self new fromStream:s.
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s close.
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^ reader
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! !
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!WindowsCompoundBinaryFileReader methodsFor:'reading from stream'!
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fromStream:aStream
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"read a stream from aStream."
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client := self.
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self processStream:aStream
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"
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WindowsCompoundBinaryFileReader fromFile:'C:\Users\cg\Downloads\vsdump\examples\Ian\Arrow & Text samples.vsd'
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"
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!
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processStream:aStream
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"process a stream."
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inStream := aStream.
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self readHeaderSector.
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"
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WindowsCompoundBinaryFileReader fromFile:'C:\Users\cg\Downloads\vsdump\examples\Ian\Arrow & Text samples.vsd'
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"
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!
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readHeaderSector
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"sector 0 is a header sector:
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_abSig = DOCF 11E0 A1B1 1AE1
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_clid = 0000 0000 0000 0000 0000 0000 0000 0000
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_uMinorVersion = 003B
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_uDllVersion = 3
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_uByteOrder = FFFE (Intel byte order)
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_uSectorShift = 9 (512 bytes)
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_uMiniSectorShift = 6 (64 bytes)
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_usReserved = 0000
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_ulReserved1 = 00000000
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_ulReserved2 = 00000000
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_csectFat = 00000001
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_sectDirStart = 00000001
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_signature = 00000000
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_ulMiniSectorCutoff = 00001000 (4096 bytes)
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_sectMiniFatStart = 00000002
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_csectMiniFat = 00000001
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_sectDifStart = FFFFFFFE (no DIF, file is < 7Mb)
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_csectDIF = 00000000 _sectFat[] = 00000000 FFFFFFFF . . . (continues with FFFFFFFF)
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"
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|sector sectorStream sig clsid uMinorVersion uDllVersion uByteOrder uSectorShift uMiniSectorShift usReserved ulReserved1 ulReserved2 csectFat sectDirStart signature ulMiniSectorCutoff sectMiniFatStart csectMiniFat sectDifStart csectDIF sectFat|
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sector := inStream nextBytes:512.
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sectorStream := sector readStream.
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sig := sectorStream nextBytes:8.
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sig = #[ 16rD0 16rCF 16r11 16rE0 16rA1 16rB1 16r1A 16rE1 ] ifFalse:[
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self error.
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].
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clsid := sectorStream nextBytes:16.
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uMinorVersion := sectorStream nextUnsignedShortMSB:false. "/ = 003B
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uDllVersion := sectorStream nextUnsignedShortMSB:false. "/ 3
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uByteOrder := sectorStream nextUnsignedShortMSB:false. "/ = FFFE (Intel byte order)
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uByteOrder == 16rFFFE ifTrue:[
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msb := false.
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] ifFalse:[
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uByteOrder == 16rFEFF ifTrue:[
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msb := true.
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] ifFalse:[
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self error
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]
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].
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uSectorShift := sectorStream nextUnsignedShortMSB:msb. "/ = 9 (sector size 512 bytes)
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uMiniSectorShift := sectorStream nextUnsignedShortMSB:msb. "/ = 6 (mini sector size 64 bytes)
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usReserved := sectorStream nextUnsignedShortMSB:msb.
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ulReserved1 := sectorStream nextUnsignedLongMSB:msb.
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ulReserved2 := sectorStream nextUnsignedLongMSB:msb.
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csectFat := sectorStream nextUnsignedLongMSB:msb. "/ number of sectors in FAT chain
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sectDirStart := sectorStream nextUnsignedLongMSB:msb. "/ first sector in directory chain
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signature := sectorStream nextUnsignedLongMSB:msb.
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ulMiniSectorCutoff := sectorStream nextUnsignedLongMSB:msb. "/ max size of ministreams (4096 bytes)
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sectMiniFatStart := sectorStream nextUnsignedLongMSB:msb. "/ first sect in mini-FAT = 00000002
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csectMiniFat := sectorStream nextUnsignedLongMSB:msb. "/ # of sects in mini-FAT chain = 00000001
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sectDifStart := sectorStream nextUnsignedLongMSB:msb. "/ first sect in DIF chain
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csectDIF := sectorStream nextUnsignedLongMSB:msb. "/ # of sects in DIF chain = FFFFFFFE (no DIF, file is < 7Mb)
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sectFat := OrderedCollection new.
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109 timesRepeat:[ "/ followed by first 109 FAT sectors.
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sectFat add:(sectorStream nextUnsignedLongMSB:msb). "/ 00000000
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].
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"/ ... FFFFFFFF
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self halt.
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"
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WindowsCompoundBinaryFileReader fromFile:'C:\Users\cg\Downloads\vsdump\examples\Ian\Arrow & Text samples.vsd'
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"
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! !
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!WindowsCompoundBinaryFileReader class methodsFor:'documentation'!
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version
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^ '$Header: /cvs/stx/stx/libbasic2/WindowsCompoundBinaryFileReader.st,v 1.1 2009-04-30 21:20:57 cg Exp $'
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! !
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