Milan Vandrovec created FLEX-33560:
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Summary: 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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