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https://issues.apache.org/jira/browse/LUCENE-4439?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Adrien Grand closed LUCENE-4439.
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Resolution: Invalid
> IOUtils.copy stops copying when InputStream.read returns 0
> ----------------------------------------------------------
>
> Key: LUCENE-4439
> URL: https://issues.apache.org/jira/browse/LUCENE-4439
> Project: Lucene - Core
> Issue Type: Bug
> Affects Versions: 4.0
> Reporter: Adrien Grand
> Priority: Minor
> Fix For: 4.1, 5.0
>
>
> IOUtils.copy has the following lines of code:
> {noformat}
> while ((len = fis.read(buffer)) > 0) {
> fos.write(buffer, 0, len);
> }
> {noformat}
> The problem is that the fact that {{InputStream.read}} returns 0 does not
> mean that it reached the end of the stream (there is -1 for this), so this
> method might not copy the whole file in rare cases.
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