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1 _____________________________________________________________________________
2
3 PASZLIB 1.0 May 11th, 1998
4
5 Based on the zlib 1.1.2, a general purpose data compression library.
6
7 Copyright (C) 1998,1999,2000 by NOMSSI NZALI Jacques H. C.
8 [kn&n DES] See "Legal issues" for conditions of distribution and use.
9 _____________________________________________________________________________
10
11
12 Introduction
13 ============
14
15 The 'zlib' compression library provides in-memory compression and
16 decompression functions, including integrity checks of the uncompressed
17 data. This version of the library supports only one compression method
18 (deflation) but other algorithms will be added later and will have the same
19 stream interface.
20
21 Compression can be done in a single step if the buffers are large
22 enough (for example if an input file is mmap'ed), or can be done by
23 repeated calls of the compression function. In the latter case, the
24 application must provide more input and/or consume the output
25 (providing more output space) before each call.
26
27 The default memory requirements for deflate are 256K plus a few kilobytes
28 for small objects. The default memory requirements for inflate are 32K
29 plus a few kilobytes for small objects.
30
31 Change Log
32 ==========
33
34 March 24th 2000 - minizip code by Gilles Vollant ported to Pascal.
35 z_stream.msg defined as string[255] to avoid problems
36 with Delphi 2+ dynamic string handling.
37 changes to silence Delphi 5 compiler warning. If you
38 have Delphi 5, defines Delphi5 in zconf.inc
39
40 May 7th 1999 - Some changes for FPC
41 deflateCopy() has new parameters
42 trees.pas - record constant definition
43 June 17th 1998 - Applied official 1.1.2 patch.
44 Memcheck turned off by default.
45 zutil.pas patch for Delphi 1 memory allocation corrected.
46 dzlib.txt file added.
47 compress2() is now exported
48
49 June 25th 1998 - fixed a conversion bug: in inftrees.pas, ZFREE(z, v) was
50 missing in line 574;
51
52 File list
53 =========
54
55 Here is a road map to the files in the Paszlib distribution.
56
57 readme.txt Introduction, Documentation
58 dzlib.txt Changes to Delphi sources for Paszlib stream classes
59
60 include file
61
62 zconf.inc Configuration declarations.
63
64 Pascal source code files:
65
66 adler.pas compute the Adler-32 checksum of a data stream
67 crc.pas compute the CRC-32 of a data stream
68 gzio.pas IO on .gz files
69 infblock.pas interpret and process block types to last block
70 infcodes.pas process literals and length/distance pairs
71 inffast.pas process literals and length/distance pairs fast
72 inftrees.pas generate Huffman trees for efficient decoding
73 infutil.pas types and macros common to blocks and codes
74 strutils.pas string utilities
75 trees.pas output deflated data using Huffman coding
76 zcompres.pas compress a memory buffer
77 zdeflate.pas compress data using the deflation algorithm
78 zinflate.pas zlib interface to inflate modules
79 zlib.pas zlib data structures. read the comments there!
80 zuncompr.pas decompress a memory buffer
81 zutil.pas
82
83 minizip/ziputils.pas data structure and IO on .zip file
84 minizip/unzip.pas
85 minizip/zip.pas
86
87 Test applications
88
89 example.pas usage example of the zlib compression library
90 minigzip.pas simulate gzip using the zlib compression library
91 minizip/miniunz.pas simulates unzip using the zlib compression library
92 minizip/minizip.pas simulates zip using the zlib compression library
93
94 Legal issues
95 ============
96
97 Copyright (C) 1998,1999,2000 by Jacques Nomssi Nzali
98
99 This software is provided 'as-is', without any express or implied
100 warranty. In no event will the author be held liable for any damages
101 arising from the use of this software.
102
103 Permission is granted to anyone to use this software for any purpose,
104 including commercial applications, and to alter it and redistribute it
105 freely, subject to the following restrictions:
106
107 1. The origin of this software must not be misrepresented; you must not
108 claim that you wrote the original software. If you use this software
109 in a product, an acknowledgment in the product documentation would be
110 appreciated but is not required.
111 2. Altered source versions must be plainly marked as such, and must not be
112 misrepresented as being the original software.
113 3. This notice may not be removed or altered from any source distribution.
114
115
116 Archive Locations:
117 ==================
118
119 Check the Paszlib home page with links
120
121 http://www.tu-chemnitz.de/~nomssi/paszlib.html
122
123 The data format used by the zlib library is described by RFCs (Request for
124 Comments) 1950 to 1952 in the files ftp://ds.internic.net/rfc/rfc1950.txt
125 (zlib format), rfc1951.txt (deflate format) and rfc1952.txt (gzip format).
126 These documents are also available in other formats from
127 ftp://ftp.uu.net/graphics/png/documents/zlib/zdoc-index.html.
128 ____________________________________________________________________________
129 Jacques Nomssi Nzali <mailto:nomssi@physik.tu-chemnitz.de> March 24th, 2000

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