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https://issues.apache.org/jira/browse/COMPRESS-26?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dennis Lundberg moved SANDBOX-284 to COMPRESS-26:
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Component/s: (was: Compress)
Affects Version/s: (was: Nightly Builds)
Key: COMPRESS-26 (was: SANDBOX-284)
Project: Commons Compress (was: Commons Sandbox)
> TarArchiveEntry(File) now crashes on file system roots
> ------------------------------------------------------
>
> Key: COMPRESS-26
> URL: https://issues.apache.org/jira/browse/COMPRESS-26
> Project: Commons Compress
> Issue Type: Bug
> Environment: win xp sp3, but this is probably irrelevant
> Reporter: Sam Smith
> Assignee: Stefan Bodewig
> Priority: Blocker
> Attachments: patch-filerootcrash.txt
>
>
> The TarArchiveEntry(File) constructor now crashes if the File argument is a
> file system root.
> For example, on my windows box, I want to backup the entire contents of my F
> drive, so I am supplying a File argument that is constructed as
> new File("F:\\")
> That particular file causes the TarArchiveEntry(File) constructor to fail as
> follows:
> Caused by: java.lang.StringIndexOutOfBoundsException: String index out
> of range: -1
> at java.lang.StringBuffer.charAt(StringBuffer.java:162)
> at
> org.apache.commons.compress.archivers.tar.TarArchiveEntry.<init>(TarArchiveEntry.java:245)
> Looking at the code (I downloaded revision 743098 yesterday), it is easy to
> see why this occured:
> 1) the
> if (osname != null) {
> logic will strip the "F:" from my path name of "F:\", leaving just the "\"
> 2) that "\" will then be turned into a single "/" by the
> fileName = fileName.replace(File.separatorChar, '/');
> line
> 3) that single "/" will then be removed by the
> while (fileName.startsWith("/")) {
> logic, leaving the empty string "".
> 4) then line #245
> if (this.name.charAt(this.name.length() - 1) != '/') {
> must crash, because it falsely assumes that fileName has content.
> THIS IS A SHOW STOPPER BUG FOR ME.
> I am not sure when this current behavior of TarArchiveEntry was introduced; a
> very old codebase (from 2+ years ago) of compress that I used to use handled
> file system roots just fine.
> There are many ways to fix this. For instance, if it is, in fact, OK for the
> name field to be empty, then you can simply put a check on line #245 as
> follows:
> if ( (name.length() > 0) && (name.charAt(name.length() - 1) !=
> '/') ) {
> (NOTE on coding style: do you really need to use "this." in the constructor
> when there is no possible ambiguity? Makes your code wordier and therefore
> harder to read.)
> My guess, not knowing your full codebase well, is that it is NOT OK for name
> to be blank. For example, you seem to want directories to end with a '/'
> char, and file ssystem roots are always directories.
> Therefore, you have some decisions to make:
> a) is it OK for the name field to simply be "/" in the case of file system
> roots?
> b) if a) is not good for some reason, then you must introduce an artificial
> root name, so that name takes on a value like
> "filesystemRoot/"
> or
> "filesystemRoot_F/"
> or whatever.
> This bug, by the way, brings up another issue: there currently are no
> javadocs regarding field contracts. Every field's javadocs needs its
> constraints to be specified as a contract, for example,
> /**
> * The entry's name.
> * <p>
> * Contract: is never null (and never empty?).
> * Contains (only ASCII chars? any Unicode chars?).
> * Must be (<= 100 chars? unlimited number of chars?).
> * If {...@link #file} is a directory, then must end in a '/' char.
> * etc...
> */
> private StringBuffer name;
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