ASE2 CARD CATALOG ENTRY
What is it ? UnZip-Ada is a decompression library for zipped files, i.e. files compressed by PKZIP (PKWARE Inc.) or a compatible file compressor. The full source is in Ada - pure Ada, not even a single OS-dependent or compiler-dependent package. Its "historical" origin is the C Info-Zip source, then a Pascal version. For details, read the file unzip.ads from the submission.
Why not just interface with C unzip code ? The idea is to have a pure Ada unzipping kernel, platform independent; no near-portable code with conditional defines. In addition it's very fun to code it in Ada. E.g. the generics allowed to half the original code in the Explode method. Exception handling is omnipresent and save lots of code: plenty of result variables in C / Pascal are saved, so, when a normal, non-corrupt archive is handled, the execution is much more straightforward.
Why not just call unzip / pkunzip ? This tool allows you to unzip data without resorting to making an OS-dependent external call.
September 1999 Gautier de Montmollin Initial Release to the ASE Library
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