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Class: Base32Coder
Object
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+--Visitor
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+--AspectVisitor
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+--ObjectCoder
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+--BaseNCoder
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+--Base32Coder
- Package:
- stx:libbasic2
- Category:
- System-Storage
- Version:
- rev:
1.7
date: 2018/09/30 13:55:17
- user: cg
- file: Base32Coder.st directory: libbasic2
- module: stx stc-classLibrary: libbasic2
- Author:
- Stefan Vogel
Instances of this class perform Base32 en- and decoding as defined in RFC 3548
5 bytes are mapped to 8 characters, representing 5 bits each.
[instance variables:]
[class variables:]
Base32Mapping String Mapping from bytes (with 5 valid bits)
to Base32 characters
Base32ReverseMapping Array Mapping from Base32 characters to 5-bit-Bytes
initialization
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initializeMappings
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initialize class variables
usage example(s):
Base32Mapping := nil.
self initializeMappings
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mapping
-
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reverseMapping
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encoding
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nextPutByte: aByte
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encode aByte on the output stream
misc
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flush
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flush the remaining bits of buffer.
The number of bits in buffer is not a multiple of 6, so we pad
the buffer and signal that padding has been done via $= characters.
private
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fillBuffer
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fill buffer with next 8 characters each representing 5 bits
|data1 text data2|
data1 := #[0 1 16r7F 16r80 16r81 16rFE 16rFF].
text := Base32Coder encode:data1.
data2 := Base32Coder decode:text.
self assert:(data2 = data1)
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|coder|
coder := Base32Coder on:'' writeStream.
coder nextPutAll:#[0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19].
coder flush.
coder contents inspect.
coder reset.
coder nextPut:254.
coder contents inspect.
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|coder decoder|
coder := Base32Coder on:'' writeStream.
coder nextPutAll:#[0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20].
coder flush.
decoder := Base32Coder on:(coder contents readStream).
[decoder atEnd] whileFalse:[
Transcript show:decoder next
].
Transcript cr.
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|coder|
coder := Base32Coder on:'' writeStream.
coder nextPutAll:(0 to:200) asByteArray.
coder flush.
Transcript showCR:(coder contents).
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|bytes encoded decoded|
bytes := #[0 0 0] copy.
0 to:255 do:[:b1 |
Transcript showCR:b1.
bytes at:1 put:b1.
0 to:255 do:[:b2 |
bytes at:2 put:b2.
0 to:255 do:[:b3 |
bytes at:3 put:b3.
encoded := Base32Coder encode:bytes.
decoded := Base32Coder decode:encoded.
self assert:(decoded = bytes).
]
]
].
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