class HZip: public TObject

_HADES_CLASS_DESCRIPTION

 HZip

 A helper class to read/work with zip file containing
 many root files. Those files can be typically produced
 by :
    zip -j -n root myzipname myrootfiles

 Note: root files will not be compressed, directory names
 ignored. It's a flat files structure. Purpose of the
 ziping of many root files into on zip archive is
 to improve the handling of many small files and reduce
 the load on the file system.

 To make the daily work more easy a command line executable hzip
 is provided to produce and work with those zip files:

 usage: hzip -o zipfile [-i filefilter] [-f filelist] [-u outputdir] [-msth]
	          -f input ascii filelist (1 file per line)
                -h help
                -i input filefilter (like "be*.root")
                -l list file in zip files
	          -m maxsize of file [bytes] (default = 2 Gbyte, will be splitted if larger)
	          -o outputzip file name (required)
                -s save mode. do not overide existing zip files (default is overwrite)
	          -t test. show what would be done
	          -u dir unzip zip files to dir
                -w print in which file membername is contained
	           examples:
                    test zip root files      : hzip -t -o test.zip -i "/mydir/be*.root"
	              zip root files           : hzip -o test.zip -i "/mydir/be*.root"
	              zip root files from list : hzip -o test.zip -f filelist
	              unzip root files to dir  : hzip -i "test_*.zip" -u /mydir
	              list files in zip files  : hzip -i "test_*.zip" -l

 from the normal terminal.
 HZip provides the functionality to access, list and files from
 a root macro.


 examples:

  TChain* chain =  new TChain("myTree");
  HZip::makeChain("my.zip",chain);            // add all root files to chain
  HZip::makeChainGlob("my*.zip",chain);       // add all root files of all matching zip files to chain
  HZip::makeChainList("filelist.txt",chain);  // add all root files of all zip files in filelist to chain

  chain->GetEntries(); // access all files and get number of entries
  chain->ls();         // list all files in chain with number of entries

  Bool_t HZip::isInside("my.zip","my.root"); // is my.root contained in my.zip?
  Int_t  HZip::list("my.zip",".*");          // list all files which match the pattern
  Int_t  HZip::getList("my.zip",list,".*");  // return to TList list all files which match the pattern
  Bool_t HZip::unzip("my.zip","mydir");      // unzip file to directory
  Bool_t HZip::addFile("my.zip","my.root");  // add this root file to the zip file
  Bool_t HZip::addFiles("my.zip",list);      // add all root files from TList list to the zip file