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Date: Tue, 5 Aug 2014 05:46:13 +0000 (UTC)
From: "Lukasz Lenart (JIRA)" <jira@apache.org>
To: issues@struts.apache.org
Message-ID: <JIRA.12731931.1407217161917.14523.1407217573065@arcas>
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References: <JIRA.12731931.1407217161917@arcas>
Subject: [jira] [Updated] (WW-4383) An infinite loop occurs in
 FastByteArrayOutputStream.java.
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     [ https://issues.apache.org/jira/browse/WW-4383?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Lukasz Lenart updated WW-4383:
------------------------------

    Description: 
An infinite loop occurs in FastByteArrayOutputStream.java. 
The conditions which an infinite loop generates are as follows. 
- The character code of input data is UTF-8. 
- The length of input data is longer than 16 KB. 
- There is a character of a surrogate pair after 16 KB of input data. 

- Example of input data:
The input data to reproduce repeats 3 bytes of character 5462 times, and the character of a surrogate pair appears behind that.

- Cause
Is clean of the out buffer necessary for decodeAndWritw method after the output in an out buffer?

{code:java}  
private static CoderResult decodeAndWrite(Writer writer, ByteBuffer in, CharBuffer out, CharsetDecoder decoder, boolean endOfInput) throws IOException {
    CoderResult result = decoder.decode(in, out, endOfInput);
    // To begin of decoded data
    out.flip();
    // Output
    writer.write(out.toString());
    return result;
}
{code}

  was:
An infinite loop occurs in FastByteArrayOutputStream.java. 
The conditions which an infinite loop generates are as follows. 
- The character code of input data is UTF-8. 
- The length of input data is longer than 16 KB. 
- There is a character of a surrogate pair after 16 KB of input data. 

- Example of input data:
The input data to reproduce repeats 3 bytes of character 5462 times, 
and the character of a surrogate pair appears behind that.

- Cause
Is clean of the out buffer necessary for decodeAndWritw method after the output in an out buffer?

{code:java}  
private static CoderResult decodeAndWrite(Writer writer, ByteBuffer in, CharBuffer out, CharsetDecoder decoder, boolean endOfInput) throws IOException {
    CoderResult result = decoder.decode(in, out, endOfInput);
    // To begin of decoded data
    out.flip();
    // Output
    writer.write(out.toString());
    return result;
}
{code}


> An infinite loop occurs in FastByteArrayOutputStream.java. 
> -----------------------------------------------------------
>
>                 Key: WW-4383
>                 URL: https://issues.apache.org/jira/browse/WW-4383
>             Project: Struts 2
>          Issue Type: Bug
>          Components: Core Actions
>    Affects Versions: 2.3.16.3
>            Reporter: Suzuki Yoshifumi
>            Priority: Minor
>   Original Estimate: 672h
>  Remaining Estimate: 672h
>
> An infinite loop occurs in FastByteArrayOutputStream.java. 
> The conditions which an infinite loop generates are as follows. 
> - The character code of input data is UTF-8. 
> - The length of input data is longer than 16 KB. 
> - There is a character of a surrogate pair after 16 KB of input data. 
> - Example of input data:
> The input data to reproduce repeats 3 bytes of character 5462 times, and the character of a surrogate pair appears behind that.
> - Cause
> Is clean of the out buffer necessary for decodeAndWritw method after the output in an out buffer?
> {code:java}  
> private static CoderResult decodeAndWrite(Writer writer, ByteBuffer in, CharBuffer out, CharsetDecoder decoder, boolean endOfInput) throws IOException {
>     CoderResult result = decoder.decode(in, out, endOfInput);
>     // To begin of decoded data
>     out.flip();
>     // Output
>     writer.write(out.toString());
>     return result;
> }
> {code}


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