Fail to untar tesseract language pack files

[iori]

I'm trying to use tesseract library in iOS platform but having some trouble. After downloading any of the language packs (.tar.gz), and successfully ungzip it (become .tar), using the popular Light-Untar-for-iOS couldn't manage to untar the file. 

Does the .tar format in tesseract language packs have special structure? One of the thing I notice is the first block is always a null block, which is not the case for any of the other tar files I tried. I am able to untar other tar files I found on my Mac without issues..

The file is not corrupted because I can untar it on my Mac without issues..

I have posted the more detailed description of my problem at:

https://github.com/mhausherr/Light-Untar-for-iOS/issues/25

[zdenko podobny]

There should be nothing special regarding tar structure - AFAIR language packages were compressed on linux and I have no problem to decompress them on linux or windows...

Zdenko

--
You received this message because you are subscribed to the Google Groups "tesseract-ocr" group.
To unsubscribe from this group and stop receiving emails from it, send an email to tesseract-oc...@googlegroups.com.
To post to this group, send email to tesser...@googlegroups.com.
Visit this group at http://groups.google.com/group/tesseract-ocr.
To view this discussion on the web visit https://groups.google.com/d/msgid/tesseract-ocr/2df9ca8f-cf7b-4373-a8e9-07c0ff3088fb%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

[iori]

I have no problem decompress them on the os level too, just that seems like a few of the TAR libraries I found for iOS platform were all based on Light-Untar-for-iOS and they couldn't untar it due to "invalid block type" error.

[iori]

Seems like the problem is because the library doesn't handle 'L' block type, which means a long file name.

https://github.com/mhausherr/Light-Untar-for-iOS/issues/20

This, together with information I found here: http://stackoverflow.com/questions/2078778/what-exactly-is-the-gnu-tar-longlink-trick

I still doesn't know how to solve the issue..

[Tom Morris]

On Saturday, June 20, 2015 at 12:38:46 AM UTC-4, iori wrote:

Seems like the problem is because the library doesn't handle 'L' block type, which means a long file name.

https://github.com/mhausherr/Light-Untar-for-iOS/issues/20

This, together with information I found here: http://stackoverflow.com/questions/2078778/what-exactly-is-the-gnu-tar-longlink-trick

Good work tracking down the root cause!

 

I still doesn't know how to solve the issue..

Seems like there are few straightforward solutions:

1. Patch the library to handle long names

2. Switch to a different library

3. Recompress/tar the data files to be compatible with the library you are using.

Tom