EDI LZSSLib

EDI LZSSLib is a file compression library for Windows 3.x, by Eschalon Development Inc. It includes an LZSSTEST.EXE utility that can compress and decompress files.

The shareware version of LZSSLib has one variant of the library: EDILZSSA.DLL. The registered version has two more, EDILZSSB.DLL and EDILZSSC.DLL, with different speed/size trade-offs. Only EDILZSSA.DLL has been evaluated for this article.

File structure
The EDILZSSA.DLL file format consists of:
 * 8-byte signature: " ".
 * Compressed data. The format is possibly identical to that of Okumura's LZSS software.

Identification
Files start with ASCII "". Unfortunately, this does not distinguish them from EDI Install packed file. There seems to be no simple way to do that.