[jira] [Updated] (COMPRESS-459) CPIO fails decoding multibyte name entries

["Stefan Bodewig (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/COMPRESS-459?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Stefan Bodewig updated COMPRESS-459:
------------------------------------
    Labels: patch-available  (was: )

> CPIO fails decoding multibyte name entries
> ------------------------------------------
>
>                 Key: COMPRESS-459
>                 URL: https://issues.apache.org/jira/browse/COMPRESS-459
>             Project: Commons Compress
>          Issue Type: Bug
>          Components: Archivers
>    Affects Versions: 1.9, 1.17
>            Reporter: Jens Reimann
>            Priority: Major
>              Labels: patch-available
>             Fix For: 1.18
>
>
> Having a CPIO archive in (e.g. UTF-8) mode and having a name entry with a name containing multi-byte characters the decoder fails.
> The problem IMHO is the "getHeaderPadCount" method, which assumes a single byte per character:
>  
> {code:java}
>     public int getHeaderPadCount(){
>         if (this.alignmentBoundary == 0) { return 0; }
>         int size = this.headerSize + 1;  // Name has terminating null
>         if (name != null) {
>             size += name.length();
>         }
>         final int remain = size % this.alignmentBoundary;
>         if (remain > 0){
>             return this.alignmentBoundary - remain;
>         }
>         return 0;
>     }
> {code}
> However this may (or may not) be true for UTF-8.
>  
> Also it wouldn't be enough to call "String#getBytes(…)" as this might already transform the underlying bytes.
> The proper solution would be to provide the name size, as read from the CPIO stream, and pass it to the entry.



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