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From "Gary Gregory (JIRA)" <j...@apache.org>
Subject [jira] Updated: (CODEC-105) ArrayIndexOutOfBoundsException when doing multiple reads() on encoding Base64InputStream
Date Wed, 09 Mar 2011 03:53:59 GMT

     [ https://issues.apache.org/jira/browse/CODEC-105?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Gary Gregory updated CODEC-105:
-------------------------------

    Summary: ArrayIndexOutOfBoundsException when doing multiple reads() on encoding Base64InputStream
 (was: ArrayIndexOutOfBoundsException when doing multiple reads() on encoding b64InputStream)

> ArrayIndexOutOfBoundsException when doing multiple reads() on encoding Base64InputStream
> ----------------------------------------------------------------------------------------
>
>                 Key: CODEC-105
>                 URL: https://issues.apache.org/jira/browse/CODEC-105
>             Project: Commons Codec
>          Issue Type: Bug
>    Affects Versions: 1.4
>         Environment: 64-bit Linux
>            Reporter: ZAK Magnus
>            Assignee: Julius Davies
>             Fix For: 1.5
>
>         Attachments: codec-105-junit-including-ASL2-license.patch, codec-105.patch
>
>
> When encoding a sizable stream byte by byte (so, just calling Base64InputStream.read()),
after 10920 successful read()s, this happens: 
> java.lang.ArrayIndexOutOfBoundsException: 2
>         at org.apache.commons.codec.binary.Base64.encode(Base64.java:502)
>         at org.apache.commons.codec.binary.Base64InputStream.read(Base64InputStream.java:157)
>         at org.apache.commons.codec.binary.Base64InputStream.read(Base64InputStream.java:109)
> Based on this, the necessary conditions seem to be that buffer = null and modulus = 2.
Then, if a read() is done, a single-byte buffer is used, whose length is doubled by resizeBuffer(),
but that still doesn't make it big enough to hold the 4 bytes written to it because modulus
was just incremented to 0. 
> Here's some sample code:
> import org.apache.commons.codec.binary.Base64InputStream;
> public class TestReads {
>     public static void main(String[] args) {
>         Base64InputStream b64stream = new Base64InputStream(System.in, true, 0, null);
>         int n = 0;
>         try {
>             while (b64stream.read() != -1) n++;
>         } catch (Exception x) {
>             System.out.println(n);
>             x.printStackTrace();
>         }
>     }
> }

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