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