[Libcdio-help] incorrect iso-read from larger than 4G DVD .iso files

[Ireadso]

2010-08-28 Kamil Ignacak wrote:
> Reading large ISO 9660 file systems (over 4GB)
> results in a file that
>     has ISO header at the beginning of file, and a copy of it right
> after
>     (2^32 - 1)th byte.
>     

Indeed a problem.  Here is a test case.  Grab the 4.1G file
  
http://ftp.scientificlinux.org/linux/scientific/6.1/x86_64/iso/SL-61-x86_64-2011-11-09-Install-DVD.iso
  
Use other tools and see an OK XML file at repodata/repomd.xml
  
Then do
  
iso-read -i
/drive/builtinhdd03/stuff/leo/Downloads/SL-61-x86_64-2011-11-09-Install-DVD.iso
 -e repodata/repomd.xml -o ~/test.txt ; more ~/test.txt
  
and see bad data.
  
Apparently Kamil was right with his analysis:
> You need to be careful when reading ISO 9660 file
> systems from DVDs.
>     If the file system is larger than 4GB, libiso9660 can't handle it
>     properly. One of library functions (iso9660_iso_seek_read()?) uses
> byte
>     offset parameter, and that offset is wrapped back to zero when it
>     reaches 2^32 bytes.
  
Tried with libcdio 0.81, 0.82 and today's git 0.84.  Running on a couple
 64 bit Enterprise Linux flavors, i.e. Fedora 14 and SL 6.1.
  
Could someone fix this or give a hint, so we can pull something from git that
works?
  
These >4G DVD .iso are here to stay.