FIZ(1)							      General Commands Manual							    FIZ(1)

NAME

       fiz - analyze damaged zoo archive for data recovery

SYNOPSIS

       fiz archive[.zoo]

DESCRIPTION

       Fiz  is	used to analyze damaged zoo archives and locate directory entries and file data in them.  The current version of fiz is 2.0 and it
       is meant to be used in conjunction with zoo version 2.0.  Fiz makes no assumptions about archive structure.  Instead,  it  simply  searches
       the  entire subject archive for tag values that mark the locations of directory entries and file data.  In a zoo archive, a directory entry
       contains information about a stored file such as its name, whether compressed or not, and its timestamp.  The file data are the actual data
       for the archived file, and may be either the original data, or the result of compressing the file.

       For  each directory entry found, fiz prints where in the archive it is located, the directory path and filename(s) found in it, whether the
       directory entry appears to be corrupted (indicated by [*CRC Error*]), and the value of the pointer to the file data that is  found  in  the
       directory  entry.   For	each block of file data found in the archive, fiz prints where in the archive the block begins.  In the case of an
       undamaged archive, the pointer to file data found in a directory entry will correspond to where fiz actually locates  the  data.   Here	is
       some sample output from fiz:

       ****************
	   2526: DIR  [changes] ==>   95
	   2587: DATA
       ****************
	   3909: DIR  [copyrite] ==> 1478
	   3970: DATA
	   4769: DATA
       ****************

       In  such  output,  DIR  indicates where fiz found a directory entry in the archive, and DATA indicates where fiz found file data in the ar-
       chive.  Filenames located by fiz are enclosed in square brackets, and the notation "==>	 95" indicates that the directory entry  found	by
       fiz  at	position 2526 has a file data pointer to position 95.  In actuality, fiz found file data at positions 2587, 3970, and 4769.  Since
       fiz found only two directory entries, and each directory entry corresponds to one file, one of the file data positions is an artifact.

       Once the locations of directory entries and file data are found, the @ modifier to zoo's archive list and extract commands can be used  and
       the  archive  contents  selectively  listed or extracted, skipping the damaged portion.	This is further described in the documentation for
       zoo(1).

       In the above case, commands to try giving to zoo might be x@2526,2587 (extract beginning at position 2526, and get file data from  position
       2587),  x@3090,3970  (extract at 3090, get data from 3970) and x@3909,4769 (extract at 3909, get data from 4769).  Once a correctly-matched
       directory entry/file data pair is found, zoo will in most cases synchronize with and correctly extract all files subsequently found in  the
       archive.  Trial and error should allow all undamaged files to be extracted.  Also note that self-extracting archives created using sez (the
       Self-Extracting Zoo utility for MS-DOS), which are normally executed on an MS-DOS system for extraction, can be extracted on non-MSDOS sys-
       tems in a similar way.

SEE ALSO

       zoo(1)

BUGS

       Random  byte patterns can occasionally be incorrectly recognized as tag values.	This occurs very rarely, however, and trial and error will
       usually permit all undamaged data to be extracted.

DIAGNOSTICS

       Fiz always exits with a status code of 0.

FUTURE DIRECTIONS

       Automation of data recovery from a damaged archive is potentially achievable.  However, since damaged archives occur only rarely, fiz as it
       currently stands is unlikely to change much in the near future.

AUTHOR

       Rahul Dhesi

								   Jan 31, 1988 							    FIZ(1)