readme.txt
1
2This directory contains a Pascal (Delphi, Kylix) interface to the
3zlib data compression library.
4
5
6Directory listing
7=================
8
9zlibd32.mak makefile for Borland C++
10example.pas usage example of zlib
11zlibpas.pas the Pascal interface to zlib
12readme.txt this file
13
14
15Compatibility 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
48Legal issues
49============
50
51The 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
56The 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