Sunzip
From Just Solve the File Format Problem
- Not related to the sunzip utility by Mark Adler [1].
Szip, AKA Sunzip[2], is a file compression utility and compressed file format. It was written by Michael Schindler. Due to changes in the program, there are actually 3 incompatible Szip formats[3]:
- the format used from v. 1.00 to v. 1.04;
- then, the format used in version 1.05X and its subversions (the "X" does not stand for anything; this is actually part of the version number[1]);
- and then, the format used for version 1.10 (which came immediately after the 1.05Xs[1]) and above.
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Extensions
The author "recommend[s] using .sz for szipped files and .tar.sz or .tsz for szipped tarfiles".[3]
Identification
For v1.10+, Szip files start with 0x53 0x5a 0x0a 0x04.[4]
The older versions of the format have no obvious signature, and are probably not easy to identify.
