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Posted to issues@commons.apache.org by "Matthijs Laan (Jira)" <ji...@apache.org> on 2021/08/03 08:47:00 UTC

[jira] [Updated] (COMPRESS-584) IOUtils.readRange() can read more from a channel than asked for

     [ https://issues.apache.org/jira/browse/COMPRESS-584?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Matthijs Laan updated COMPRESS-584:
-----------------------------------
    Summary: IOUtils.readRange() can read more from a channel than asked for  (was: IOUtils.readRange(ReadableByteChannel) can read more than asked for)

> IOUtils.readRange() can read more from a channel than asked for
> ---------------------------------------------------------------
>
>                 Key: COMPRESS-584
>                 URL: https://issues.apache.org/jira/browse/COMPRESS-584
>             Project: Commons Compress
>          Issue Type: Bug
>          Components: Archivers
>    Affects Versions: 1.21
>            Reporter: Matthijs Laan
>            Priority: Major
>
> When {{IOUtils.readRange(ReadableByteChannel)}} gets less than the number of bytes asked for in the first read call it does not reduce the buffer size for the next read call and may read more than asked for.
> This situation is rare when using a {{FileChannel}} but I wrote a {{SeekableByteChannel}} backed by a URI using HTTP range requests and reading from a socket can often return less bytes than asked for. When I used this channel to read a {{ZipFile}} it only read the ZIP central partially sometimes because {{IOUtils.readRange()}} called {{ZipFile.fromreadCentralDirectoryEntry()}} can read more bytes than asked for.



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