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FIZ(1) General Commands Manual FIZ(1) NAME fiz - analyze damaged zoo archive for data revovery 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 time- stamp. 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 lo- cated, the directory path and filename(s) found in it, whether the direc- tory 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 actu- ally 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 archive. 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 en- tries, 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 @ mod- ifier to zoo's archive list and extract commands can be used and the archive contents selectively listed or extracted, skipping the damaged por- tion. 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 (ex- tract 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 en- try/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 extrac- tion, can be extracted on non-MSDOS systems in a similar way. SEE ALSO zoo(1) BUGS Random byte patterns can occasionally be incorrectly recognized as tag val- ues. 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 achiev- able. However, since damaged archives occur only rarely, fiz as it cur- rently stands is unlikely to change much in the near future. AUTHOR Rahul Dhesi Jan 31, 1988 FIZ(1)
NAME | SYNOPSIS | DESCRIPTION | SEE ALSO | BUGS | DIAGNOSTICS | FUTURE DIRECTIONS | AUTHOR
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