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https://issues.apache.org/jira/browse/FLEX-33560?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Justin Mclean resolved FLEX-33560.
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Resolution: Won't Fix
Sorry but this is an Adobe AIR issue not an Apache Flex SDK issue.
Please report the bug to Adobe here.
https://bugbase.adobe.com
> FileStream position is updated incorrectly in FileMode.APPEND mode
> ------------------------------------------------------------------
>
> Key: FLEX-33560
> URL: https://issues.apache.org/jira/browse/FLEX-33560
> Project: Apache Flex
> Issue Type: Bug
> Affects Versions: Adobe Flex SDK 3.6 (Release)
> Environment: 1. in debugger of FlexBuilder 3
> 2. compiled, with AIR 3.6.0, 3.7.0
> Reporter: Milan Vandrovec
>
> When writing to a FileStream so that the new position would be a multiple of
> 4096, the position is increased twice (writing a byte advances from 4095 to
> 4097, writing 512 bytes advances from 3584 to 4608).
> Sample code:
> var cnt: int;
> var logfile: File=new File("c:/demo.txt");
> var logstream: FileStream=new FileStream();
> logstream.open(logfile, FileMode.WRITE);
> logstream.close();
> logstream.open(logfile, FileMode.APPEND);
> for (cnt=0; cnt<4096-2; cnt++)
> logstream.writeByte(0x41);
> trace(logstream.position);
> logstream.writeByte(0x42);
> trace(logstream.position);
> logstream.writeByte(0x43);
> trace(logstream.position);
> logstream.writeByte(0x44);
> trace(logstream.position);
> logstream.close();
>
> var x512: ByteArray=new ByteArray();
> for (cnt=0; cnt<512; cnt++)
> x512.writeByte(0x41);
> x512.position=0;
> logstream.open(logfile, FileMode.WRITE);
> logstream.close();
> logstream.open(logfile, FileMode.APPEND);
> for (cnt=0; cnt<7; cnt++)
> logstream.writeBytes(x512);
> trace(logstream.position); //now at 4096-512
> logstream.writeBytes(x512);
> trace(logstream.position); //now at 4096+512
> logstream.close();
> Actual output:
> 4094
> 4095
> 4097
> 4098
> ---
> 3584
> 4608
> Expected output:
> 4094
> 4095
> 4096
> 4097
> ---
> 3584
> 4096
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