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util/pack/xpkRAKE_V1.7.lha

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Short:A packer for the xpk-package, V1.7
Author:dagefoer at ibr.cs.tu-bs.de (K. Dagefoerde)
Uploader:dagefoer ibr cs tu-bs de (K Dagefoerde)
Type:util/pack
Architecture:m68k-amigaos
Date:1995-09-07
Download:http://aminet.net/util/pack/xpkRAKE_V1.7.lha - View contents
Readme:http://aminet.net/util/pack/xpkRAKE_V1.7.readme
Downloads:366
---------------------------------------------------------------------------

                                    RAKE

                         A cruncher of the LZ77 family
                             for the XPK-package
                                Version 1.7
                     Copyright 1995 by Karsten Dageförde

                              Status: FREEWARE



                             License/Disclaimer
                             ------------------

   This  library  may  be  freely  distributed, as long as it is kept in its
original,  complete,  and  unmodified  form.  It may NOT be distributed in a
commercial package of any kind without my permission.

   This  program  is  distributed  in  the  hope that it will be useful, but
WITHOUT  ANY  WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE.



                                Installation
                                ------------

    You'll  need  to install the XPK package first to use this library.  The
XPK  package  should  be available on most Bulletin Board Systems, so try to
get it there.

    If  you  already have the  XPK package  installed, add  this  library to
your system simply by copying the xpkRAKE.library  to your LIBS:Compressors/
directory. The library can be found in xpkRAKE_68000/ or if you have a 68020
(or greater) processor, take the library placed in xpkRAKE_68020/.



                                Description
                                -----------

    RAKE is an  XPK packer sublibrary  which  implements a highly  optimized
form  of  the popular  LZ77 compression  algorithm. It  uses  static huffman
coding   for   the  'len'   and  a  three-step  coding  for   the   'offset'
information.  The  major  feature   of this packer  is the  highly optimized
algorithm for tracking down redundant data.

    RAKE  supports  four  modes  at  compression (see below).
      - Scanner & Coder together fit in 68020 instruction cache
      - Hashbuffer-size will be reduced downto 0.5Kb, if memory is short


-----------------------------------------------------------------------------
    NOTE: There is no need to repack  files packed  with  RAKE  V1.0 - V1.6
          (68000 or 68020 version), because RAKE V1.7 is totally compatible
          with older versions and vice versa, it just works faster.
-----------------------------------------------------------------------------

                                 Statistics
                                 ----------

    Following  is  a table  briefly listing some statistics for RAKE.  They
were  generated  by  xBench  on  an  A3000/25  with  2+8 MB Mem,  using the
AmigaVision  executable  as  data  (standard  xpk benchmark configuration).
Note that memory needs don't include xpkmaster.library's buffers.


68020 version:                                                      Mem usage
[Kb] Packer      UComp   Comp    CF     CTime    CSpd     UTime    USpd 
Pack/Unpacking
--------------------------------------------------------------------------------
--
rake.100   594712 322872 45.8%      6.64   89565      0.90  660791   256   0
rake.075   594712 324964 45.4%      5.73  103789      0.91  653529   256   0
rake.050   594712 326908 45.1%      5.13  115928      0.91  653529   256   0
rake.025   594712 328796 44.8%      4.77  124677      0.92  646426   256   0


68000 version:                                                      Mem usage
[Kb] Packer      UComp   Comp    CF     CTime    CSpd     UTime    USpd 
Pack/Unpacking
--------------------------------------------------------------------------------
--
rake.100   594712 322872 45.8%      7.07   84117      1.16  512682   256   0
rake.075   594712 324964 45.4%      6.16   96544      1.17  508300   256   0
rake.050   594712 326908 45.1%      5.56  106962      1.17  508300   256   0
rake.025   594712 328796 44.8%      5.20  114367      1.18  503993   256   0



                                  History
                                 ---------

Sep-9-94   V1.0 First public release (68000,68020)

           [...]

Jul-1-95   V1.6 - Scanning algorithm improved.

Sep-6-95   V1.7 - 68020 version now checks if there is an appropriate
                  processor (68020 or better)



                              Contact Addresses
                              -----------------

                      dagefoer at ibr.cs.tu-bs.de (preferred)
                                     OR
                          dagefoer at rob.cs.tu-bs.de
                                     OR
                           K.Dagefoerde at tu-bs.de


  \\//_ Live long and prosper


Contents of util/pack/xpkRAKE_V1.7.lha
 PERMSSN    UID  GID    PACKED    SIZE  RATIO     CRC       STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic]                 1746    4575  38.2% -lh5- 8cc2 Sep  6  1995 xpkRAKE_V1.7/xpkRAKE.doc
[generic]                 3785    6604  57.3% -lh5- 07a2 Sep  6  1995 xpkRAKE_V1.7/xpkRAKE_68000/xpkRAKE.library
[generic]                 3832    7108  53.9% -lh5- 619b Sep  6  1995 xpkRAKE_V1.7/xpkRAKE_68020/xpkRAKE.library
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total         3 files    9363   18287  51.2%            Sep  7  1995

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