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- GT for DOS Evaluation Pack - README.TXT
- ==========================================
-
- Thanks for your interest in GT. This file contains instructions
- for the GT for DOS evaluation.
-
- If you're reading this, you've probably already unpacked the archive
- file, and you should have the following programs:
-
- * GT32.EXE (32-bit GT Compressor)
- * UNGT32.EXE (32-bit GT Decompressor)
- * DOS4GW.EXE (32-bit DOS Extender for the above programs)
-
-
- GT is a PKZIP-like utility used to compress files to a fraction of their
- original size. GT is optimised for maximum decompression speed, and is
- particularly useful for developers of CD-based products.
-
- It also features a very simple API (just two functions) and a unique
- memory-saving decompression process which avoids the need for separate data
- buffers. Note that, for simplicity, GT doesn't generate archive files - it
- just concentrates on squashing individual files as much as possible.
-
- This evaluation pack provides all you need to test GT on a PC - to use GT
- in a retail product, you need to purchase a GT decompression library
- (DOS / Win 3.1 / Win 95 / Win NT / PSX / Saturn). 'C' and assembler
- source code versions are also available - contact ATD for pricing and
- ordering information.
-
- Note that the GT utilities supplied are 32-bit; i.e. they require at least
- a 80386 processor in order to run.
-
-
- GT32 Command Line Parameters
- ============================
-
- ATD GT32 File Compressor Version 2.11 - (C) 1995,1996
-
- Usage: GT32 <filespec> [-b|l] [-p#] [-x] [-h]
- <filespec> may include wildcards
- -b - Output file in big endian format
- -l - Output file in little endian format (default)
- -p# - Pad data at front so file is multiple of # bytes
- -x - Maximum compression
- -h - Display this help screen
-
-
- <filespec>
- ----------
-
- This specifies the files you wish to compress - wildcards are accepted.
- The output file name(s) are the same as the input one, except that the file
- extention is .GTO - take care to ensure that no two input files have the
- same first 8 characters!
-
-
- -b - Output file in big endian format
- --------------------------------------
-
- The compressed files will be output in 'big endian' or Motorola format,
- storing the most significant byte first, and least significant byte last.
- This is the native format for the Mac, and most games consoles.
-
-
- -l - Output file in little endian format (default)
- -----------------------------------------
-
- The compressed files will be output in 'little endian' or Intel format,
- storing the least significant byte first, and most significant byte last.
- This is the native format for the PC.
-
-
- -p# - Pad data at front so file is multiple of # bytes
- ------------------------------------------------------
-
- In order to optimise loading from CD (which tend to load data in fixed
- sized chunks), unused data can be placed at the start of the file so that
- the file size becomes a multiple of # bytes. For PC CD-ROMs, # = 2048 bytes.
-
-
- -x - Maximum compression
- -------------------------
-
- Maximum compression may be gained by specifying this switch. Note that
- although this may increase compression time, decompression time will not
- rise - indeed, if the resultant file size is smaller with maximum
- compression, the decompression time should be reduced.
-
-
-
- UNGT32 Command Line Parameters
- ==============================
-
- ATD GT32 File Decompressor Version 2.11 - (C) 1995,1996
-
- Usage: UNGT32 <filespec> [-c] [-p#] [-o] [-h]
- <filespec> may include wildcards
- -c - Decompresses using C rather than pure 80386
- -p# - Pentium timings where # is processor speed in MHz
- -o - Test overlapped decompression
- -h - Display this help screen
-
-
- <filespec>
- ----------
-
- This specifies the files you wish to decompress - wildcards are accepted.
- These files should be .GTO files, produced by the GT32 compressor. The
- output file name(s) are the same as the input one, except that the file
- extention is .TST - take care to ensure that no two input files have
- the same first 8 characters!
-
-
- -c - Decompresses using C rather than pure 80386
- -------------------------------------------------
-
- UNGT32 contains two separate but functionally equivalent decompression
- routines - one written in 'C', the other in assembler. This switch (when
- used in conjunction with -p#) allows you to monitor the decompression
- performance using the 'C' code (which is available separately).
-
-
- -p# - Pentium timings where # is processor speed in MHz
- -------------------------------------------------------
-
- Allows you to monitor the decompression performance (for Pentium machines
- only!) by counting the number of cycles that the processor takes inside the
- decompression routine.
-
-
- -o - Test overlapped decompression
- -----------------------------------
-
- Overlapped decompression is when the compressed data is decompressed 'over
- itself' in order to minimise memory requirements. This option allows you to
- make sure that decompressing in this manner is successful.
-
-
- Attention To Detail Ltd
- Unit 3
- Nunhold Business Centre
- Dark Lane
- Hatton
- Warwickshire
- CV35 8XB
- United Kingdom
-
- Tel: +44 (0) 1926 843444
- Fax: +44 (0) 1926 843363
- E-mail: info@atd.co.uk
-