129 lines
5.1 KiB
Plaintext
129 lines
5.1 KiB
Plaintext
_____________________________________________________________________________
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PASZLIB 1.0 May 11th, 1998
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Based on the zlib 1.1.2, a general purpose data compression library.
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Copyright (C) 1998,1999,2000 by NOMSSI NZALI Jacques H. C.
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[kn&n DES] See "Legal issues" for conditions of distribution and use.
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_____________________________________________________________________________
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Introduction
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============
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The 'zlib' compression library provides in-memory compression and
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decompression functions, including integrity checks of the uncompressed
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data. This version of the library supports only one compression method
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(deflation) but other algorithms will be added later and will have the same
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stream interface.
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Compression can be done in a single step if the buffers are large
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enough (for example if an input file is mmap'ed), or can be done by
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repeated calls of the compression function. In the latter case, the
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application must provide more input and/or consume the output
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(providing more output space) before each call.
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The default memory requirements for deflate are 256K plus a few kilobytes
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for small objects. The default memory requirements for inflate are 32K
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plus a few kilobytes for small objects.
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Change Log
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==========
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March 24th 2000 - minizip code by Gilles Vollant ported to Pascal.
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z_stream.msg defined as string[255] to avoid problems
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with Delphi 2+ dynamic string handling.
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changes to silence Delphi 5 compiler warning. If you
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have Delphi 5, defines Delphi5 in zconf.inc
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May 7th 1999 - Some changes for FPC
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deflateCopy() has new parameters
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trees.pas - record constant definition
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June 17th 1998 - Applied official 1.1.2 patch.
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Memcheck turned off by default.
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zutil.pas patch for Delphi 1 memory allocation corrected.
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dzlib.txt file added.
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compress2() is now exported
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June 25th 1998 - fixed a conversion bug: in inftrees.pas, ZFREE(z, v) was
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missing in line 574;
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File list
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=========
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Here is a road map to the files in the Paszlib distribution.
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readme.txt Introduction, Documentation
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dzlib.txt Changes to Delphi sources for Paszlib stream classes
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include file
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zconf.inc Configuration declarations.
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Pascal source code files:
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adler.pas compute the Adler-32 checksum of a data stream
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crc.pas compute the CRC-32 of a data stream
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gzio.pas IO on .gz files
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infblock.pas interpret and process block types to last block
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infcodes.pas process literals and length/distance pairs
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inffast.pas process literals and length/distance pairs fast
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inftrees.pas generate Huffman trees for efficient decoding
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infutil.pas types and macros common to blocks and codes
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strutils.pas string utilities
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trees.pas output deflated data using Huffman coding
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zcompres.pas compress a memory buffer
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zdeflate.pas compress data using the deflation algorithm
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zinflate.pas zlib interface to inflate modules
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zlib.pas zlib data structures. read the comments there!
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zuncompr.pas decompress a memory buffer
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zutil.pas
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minizip/ziputils.pas data structure and IO on .zip file
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minizip/unzip.pas
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minizip/zip.pas
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Test applications
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example.pas usage example of the zlib compression library
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minigzip.pas simulate gzip using the zlib compression library
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minizip/miniunz.pas simulates unzip using the zlib compression library
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minizip/minizip.pas simulates zip using the zlib compression library
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Legal issues
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============
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Copyright (C) 1998,1999,2000 by Jacques Nomssi Nzali
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the author be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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Archive Locations:
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==================
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Check the Paszlib home page with links
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http://www.tu-chemnitz.de/~nomssi/paszlib.html
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The data format used by the zlib library is described by RFCs (Request for
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Comments) 1950 to 1952 in the files ftp://ds.internic.net/rfc/rfc1950.txt
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(zlib format), rfc1951.txt (deflate format) and rfc1952.txt (gzip format).
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These documents are also available in other formats from
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ftp://ftp.uu.net/graphics/png/documents/zlib/zdoc-index.html.
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____________________________________________________________________________
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Jacques Nomssi Nzali <mailto:nomssi@physik.tu-chemnitz.de> March 24th, 2000 |