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Posted to issues@commons.apache.org by "Sebb (JIRA)" <ji...@apache.org> on 2013/06/02 14:22:20 UTC

[jira] [Created] (IO-385) FileUtils.doCopyFile can potentially loop for ever

Sebb created IO-385:
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             Summary: FileUtils.doCopyFile can potentially loop for ever
                 Key: IO-385
                 URL: https://issues.apache.org/jira/browse/IO-385
             Project: Commons IO
          Issue Type: New Feature
            Reporter: Sebb


FileUtils.doCopyFile caches the input file size and only exits the loop once it has read sufficient bytes.

If the input file is truncated after obtaining the file size, the loop might never exit.

One possible way round this might be to check whether anything has been transferred. However, I don't know if it's possible for FileChannel.transferFrom() to temporarily return 0 when there is data available; if so that could cause some existing applications to break.

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