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readme.txt

      1 
      2 This directory contains a Pascal (Delphi, Kylix) interface to the
      3 zlib data compression library.
      4 
      5 
      6 Directory listing
      7 =================
      8 
      9 zlibd32.mak     makefile for Borland C++
     10 example.pas     usage example of zlib
     11 zlibpas.pas     the Pascal interface to zlib
     12 readme.txt      this file
     13 
     14 
     15 Compatibility notes
     16 ===================
     17 
     18 - Although the name "zlib" would have been more normal for the
     19   zlibpas unit, this name is already taken by Borland's ZLib unit.
     20   This is somehow unfortunate, because that unit is not a genuine
     21   interface to the full-fledged zlib functionality, but a suite of
     22   class wrappers around zlib streams.  Other essential features,
     23   such as checksums, are missing.
     24   It would have been more appropriate for that unit to have a name
     25   like "ZStreams", or something similar.
     26 
     27 - The C and zlib-supplied types int, uInt, long, uLong, etc. are
     28   translated directly into Pascal types of similar sizes (Integer,
     29   LongInt, etc.), to avoid namespace pollution.  In particular,
     30   there is no conversion of unsigned int into a Pascal unsigned
     31   integer.  The Word type is non-portable and has the same size
     32   (16 bits) both in a 16-bit and in a 32-bit environment, unlike
     33   Integer.  Even if there is a 32-bit Cardinal type, there is no
     34   real need for unsigned int in zlib under a 32-bit environment.
     35 
     36 - Except for the callbacks, the zlib function interfaces are
     37   assuming the calling convention normally used in Pascal
     38   (__pascal for DOS and Windows16, __fastcall for Windows32).
     39   Since the cdecl keyword is used, the old Turbo Pascal does
     40   not work with this interface.
     41 
     42 - The gz* function interfaces are not translated, to avoid
     43   interfacing problems with the C runtime library.  Besides,
     44     gzprintf(gzFile file, const char *format, ...)
     45   cannot be translated into Pascal.
     46 
     47 
     48 Legal issues
     49 ============
     50 
     51 The zlibpas interface is:
     52   Copyright (C) 1995-2003 Jean-loup Gailly and Mark Adler.
     53   Copyright (C) 1998 by Bob Dellaca.
     54   Copyright (C) 2003 by Cosmin Truta.
     55 
     56 The example program is:
     57   Copyright (C) 1995-2003 by Jean-loup Gailly.
     58   Copyright (C) 1998,1999,2000 by Jacques Nomssi Nzali.
     59   Copyright (C) 2003 by Cosmin Truta.
     60 
     61   This software is provided 'as-is', without any express or implied
     62   warranty.  In no event will the author be held liable for any damages
     63   arising from the use of this software.
     64 
     65   Permission is granted to anyone to use this software for any purpose,
     66   including commercial applications, and to alter it and redistribute it
     67   freely, subject to the following restrictions:
     68 
     69   1. The origin of this software must not be misrepresented; you must not
     70      claim that you wrote the original software. If you use this software
     71      in a product, an acknowledgment in the product documentation would be
     72      appreciated but is not required.
     73   2. Altered source versions must be plainly marked as such, and must not be
     74      misrepresented as being the original software.
     75   3. This notice may not be removed or altered from any source distribution.
     76 
     77