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RJCRUSH
RJCRUSH is an executable compressor with the ability to compress overlays. RJCRUSH only supports EXE-files; it is the author's opinion that EXE-files are superior to COM-files. The ability to compress overlays is aimed at the developer-level. Without having the source code to a program, an attempt to make it aware of compressed overlays would be futile.
RJCRUSH supports the VROOM overlay engine of Borland International. Currently, only the Turbo and Borland Pascal compilers are supported; versions 5.5 through 7.0 are supported. Once the overlay engine of Borland C++ has been investigated, and the correct point from where to patch in to the engine has been identified, RJCRUSH will support that compiler. (At this point in time the author has very little time for such an endeavour, due to time constraints imposed by his MSc research. If the need arises, and is large enough, this will become a priority.)
RJCRUSH is a DOS-based application, and will run under Windows and OS/2.
Even though RJCRUSH is primarily aimed at the developer, users may also benefit by using RJCRUSH. Compared with the end-results of many competing executable compressors, RJCRUSH often creates smaller executables. RJCRUSH is based on an LZ77 compression technique and utilizes a superior two-pass executable relocation table compression techique. This technique involves an initial transformation of the relocation table into a form that is more suitable to compression by the LZ77-based compression algorithm. The end-result is far smaller executables - often by as much as a few 100 bytes.
The overlay compression algorithm is similar to that used for executables, except that it performs extra checks to ensure safe decompression during the run-time of the application.
RJCRUSH does not compress Windows executables. Furthermore it is a real-mode DOS executable compressor. This means that protected mode DOS executables or OS/2 executables are also not supported.
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