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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HARMONY-6393) fix "new byte[in.available()]" anti-pattern
Date Fri, 04 Dec 2009 18:41:20 GMT

    [ https://issues.apache.org/jira/browse/HARMONY-6393?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12786062#action_12786062
] 

Hudson commented on HARMONY-6393:
---------------------------------

Integrated in Harmony-1.5-head-linux-x86_64 #577 (See [http://hudson.zones.apache.org/hudson/job/Harmony-1.5-head-linux-x86_64/577/])
    Move readFullyAndClose method into LUNI utils' InputStreamHelper, and roll the input stream
exposer code into there too.
Replace a number of places that read the full stream with calls to the new helper.
Part of  (fix "new byte[in.available()]" anti-pattern)


> fix "new byte[in.available()]" anti-pattern
> -------------------------------------------
>
>                 Key: HARMONY-6393
>                 URL: https://issues.apache.org/jira/browse/HARMONY-6393
>             Project: Harmony
>          Issue Type: Bug
>          Components: Classlib
>            Reporter: Elliott Hughes
>
> there are a number of places where it's assumed that you can read a file in its entirety
by allocating a byte[] corresponding to the size reported by InputStream.available. using
a ByteArrayOutputStream and reading until EOF (rather than any assumed length) is the best
choice (because it works for files where stat(2) doesn't report the size correctly, such as
in Linux's /proc), but even File.length would be good enough.
> here are all the matches for "new byte.*available". this may miss cases ("int len = in.available();
... new byte[len]", say), but it doesn't appear to contain any false positives.
> ./rmi/src/main/java/java/rmi/server/RMIClassLoader.java:214: byte[] buf = new byte[in.available()];
> ./luni/src/main/java/org/apache/harmony/luni/util/InputStreamExposer.java:86:       
      buffer = new byte[available];
> ./luni/src/main/java/org/apache/harmony/luni/util/ExposedByteArrayInputStream.java:52:
     final byte[] buffer = new byte[available];
> ./luni/src/test/api/common/org/apache/harmony/luni/tests/java/io/SerializationStressTest.java:670:
            byte[] input = new byte[dis.available()];
> ./print/src/test/api/java/common/javax/print/ValueTests.java:562: res = new byte [iStream.available()];
> ./security/src/main/java/common/org/apache/harmony/security/utils/JarUtils.java:147:
     byte[] sfBytes = new byte[signature.available()];
> ./swing/src/main/java/common/javax/swing/plaf/basic/BasicLookAndFeel.java:1022:     
                byte[] data = new
> byte[audioStream.available()];
> ./swing/src/main/java/common/javax/swing/text/html/parser/DTD.java:145:      byte[] enc
= new byte[stream.available()];

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