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ID Category Severity Reproducibility Date Submitted Last Update
0006736 [Squeak] Collections major always 10-19-07 13:28 10-19-07 20:26
Reporter noha View Status public  
Assigned To
Priority normal Resolution open  
Status new   Product Version 3.9
Summary 0006736: PositionableStream>>nextLittleEndianNumber: produces DNU: Character>>bitOr:
Description nextLittleEndianNumber: reads an amount of characters from a stream and converts them to a number. nextNumber: is working. In netLittleEndianNumber: a call to isInteger is missing.
Additional Information
Attached Files  PositionableStream-noha-M6736.1.cs [^] (492 bytes) 10-19-07 13:35

- Relationships

- Notes
(0011357 - 1164 - 1398 - 1398 - 1398 - 1398 - 1398)
nicolas cellier
10-19-07 20:14

 Yes, good catch.
However, this might be a false good idea, because some file stream can groke several bytes with a single #next message (for example transform a CR-LF pair into a single Character cr).

The only safe way is to send #binary to your stream.

Observe typical example of #nextNumber: failure below:


| f n1 n2 |
f := FileStream newFileNamed: 'foo'.
[f binary.
f nextPutAll: #(16r01 16r02 16r0D 16r0A 16r00) asByteArray] ensure: [f close].

f := FileStream oldFileNamed: 'foo'.
n1 := [f binary.
f nextNumber: 4] ensure: [f close].

f := FileStream oldFileNamed: 'foo'.
n2 := [f ascii; wantsLineEndConversion: true.
f nextNumber: 4] ensure: [f close].

^({n1. n2.}) collect: [:e | e printStringBase: 16]


Another case with UTF-8:

| f n1 n2 |
f := FileStream newFileNamed: 'foo'.
[f binary.
f nextPutAll: #(16r01 16r02 16rE0 16r04 16r05 16r06) asByteArray] ensure: [f close].

f := FileStream oldFileNamed: 'foo'.
n1 := [f binary.
f nextNumber: 4] ensure: [f close].

f := FileStream oldFileNamed: 'foo'.
n2 := [f ascii.
f nextNumber: 4] ensure: [f close].

^ ({n1. n2.}) collect: [:e | e printStringBase: 16]
 
(0011358 - 215 - 237 - 237 - 237 - 237 - 237)
nicolas cellier
10-19-07 20:26

 In other words, I would prefer #asInteger to be removed from #nextNumber: rather than added to #nextLittleEndianNumber:

A good exception telling me "hey your stream is not binary" is better than a false result...
 

- Issue History
Date Modified Username Field Change
10-19-07 13:28 noha New Issue
10-19-07 13:35 noha File Added: PositionableStream-noha-M6736.1.cs
10-19-07 13:36 noha Issue Monitored: noha
10-19-07 20:14 nicolas cellier Note Added: 0011357
10-19-07 20:26 nicolas cellier Note Added: 0011358

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