Initial import of zlib-1.1.1

PR:		5869
Reviewed by:	jdp

1 files changed, 57 insertions, 29 deletions

diff --git a/lib/libz/README b/lib/libz/README
index 28adc90..acaea4f 100644
--- a/lib/libz/README
+++ b/lib/libz/README
@@ -1,15 +1,16 @@
-zlib 1.0.4 is a general purpose data compression library.  All the code
-is reentrant (thread safe).  The data format used by the zlib library
+zlib 1.1.1 is a general purpose data compression library.  All the code
+is thread safe.  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
 
-All functions of the compression library are documented in the file
-zlib.h. A usage example of the library is given in the file example.c
-which also tests that the library is working correctly. Another
-example is given in the file minigzip.c. The compression library itself
-is composed of all source files except example.c and minigzip.c.
+All functions of the compression library are documented in the file zlib.h
+(volunteer to write man pages welcome, contact jloup@gzip.org). A usage
+example of the library is given in the file example.c which also tests that
+the library is working correctly. Another example is given in the file
+minigzip.c. The compression library itself is composed of all source files
+except example.c and minigzip.c.
 
 To compile all files and run the test program, follow the instructions
 given at the top of Makefile. In short "make test; make install"
@@ -18,45 +19,72 @@ makefiles such as Makefile.msc; for VMS, use Make_vms.com or descrip.mms.
 
 Questions about zlib should be sent to <zlib@quest.jpl.nasa.gov> or,
 if this fails, to the addresses given below in the Copyright section.
-The zlib home page is http://quest.jpl.nasa.gov/zlib/
+The zlib home page is http://www.cdrom.com/pub/infozip/zlib/
+The official zlib ftp site is ftp://ftp.cdrom.com/pub/infozip/zlib/
+Mark Nelson wrote an article about zlib for the Jan. 1997 issue of 
+Dr. Dobb's Journal; a copy of the article is available in
+http://web2.airmail.net/markn/articles/zlibtool/zlibtool.htm
 
-The changes made in version 1.0.4 are documented in the file ChangeLog.
-The main changes since 1.0.3 are:
+The changes made in version 1.1.1 are documented in the file ChangeLog.
+The main changes since 1.1.0 are:
 
-- In very rare conditions, deflate(s, Z_FINISH) could fail to produce an EOF
-  bit, so the decompressor could decompress all the correct data but went
-  on to attempt decompressing extra garbage data. This affected minigzip too.
-- zlibVersion and gzerror return const char* (needed for DLL)
-- port to RISCOS (no fdopen, no multiple dots, no unlink, no fileno)
+- fix macros _tr_tally_* in deflate.h for debug mode  (Glenn Randers-Pehrson)
+- remove block truncation heuristic which had very marginal effect for zlib
+  (smaller lit_bufsize than in gzip 1.2.4) and degraded a little the
+  compression ratio on some files. This also allows inlining _tr_tally for
+  matches in deflate_slow.
 
 
+Unsupported third party contributions are provided in directory "contrib".
+
+A Java implementation of zlib is available in the Java Development Kit 1.1
+http://www.javasoft.com/products/JDK/1.1/docs/api/Package-java.util.zip.html
+See the zlib home page http://www.cdrom.com/pub/infozip/zlib/ for details.
+
 A Perl interface to zlib written by Paul Marquess <pmarquess@bfsec.bt.co.uk>
 is in the CPAN (Comprehensive Perl Archive Network) sites, such as:
 ftp://ftp.cis.ufl.edu/pub/perl/CPAN/modules/by-module/Compress/Compress-Zlib*
 
+A Python interface to zlib written by A.M. Kuchling <amk@magnet.com>
+is available from the Python Software Association sites, such as:
+ftp://ftp.python.org/pub/python/contrib/Encoding/zlib*.tar.gz
+
+An experimental package to read files in .zip format, written on top of
+zlib by Gilles Vollant <info@winimage.com>, is available at
+http://www.winimage.com/zLibDll/unzip.html
+
 
 Notes for some targets:
 
-- For Turbo C the small model is supported only with reduced performance to
-  avoid any far allocation; it was tested with -DMAX_WBITS=11 -DMAX_MEM_LEVEL=3
+- To build a Windows DLL version, include in a DLL project zlib.def, zlib.rc
+  and all .c files except example.c and minigzip.c; compile with -DZLIB_DLL
+  The zlib DLL support was initially done by Alessandro Iacopetti and is
+  now maintained by Gilles Vollant <info@winimage.com>. Check the zlib DLL
+  home page at http://www.winimage.com/zLibDll
+
+  From Visual Basic, you can call the DLL functions which do not take
+  a structure as argument: compress, uncompress and all gz* functions.
+  See contrib/visual-basic.txt for more information.
+  I don't know how to handle structures in Visual Basic, sorry.
 
-- For 64-bit Iris, deflate.c must be compiled without any optimization.
+- For 64-bit Irix, deflate.c must be compiled without any optimization.
   With -O, one libpng test fails. The test works in 32 bit mode (with
-  the -32 compiler flag). The compiler bug has been reported to SGI.
+  the -n32 compiler flag). The compiler bug has been reported to SGI.
 
 - zlib doesn't work with gcc 2.6.3 on a DEC 3000/300LX under OSF/1 2.1   
   it works when compiled with cc.
 
-- zlib doesn't work on HP-UX 9.05 with one cc compiler (the one not
-  accepting the -O option). It works with the other cc compiler.
+- zlib doesn't work on HP-UX 9.05 with some versions of /bin/cc. It works
+  with other compilers. Use "make test" to check your compiler.
 
-- To build a Windows DLL version, include in a DLL project zlib.def, zlib.rc
-  and all .c files except example.c and minigzip.c; compile with -DZLIB_DLL
-  For help on building a zlib DLL, contact Alessandro Iacopetti
-  <iaco@email.alessandria.alpcom.it>  http://lisa.unial.it/iaco ,
-  or contact Brad Clarke <bclarke@cyberus.ca>.
+- For shared memory multiprocessors, the decompression code assumes that
+  writes to pointers are atomic. Also the functions zalloc and zfree passed
+  to deflateInit must be multi-threaded in this case.
 
-- gzdopen is not supported on RISCOS
+- gzdopen is not supported on RISCOS, BEOS and by some Mac compilers.
+
+- For Turbo C the small model is supported only with reduced performance to
+  avoid any far allocation; it was tested with -DMAX_WBITS=11 -DMAX_MEM_LEVEL=3
 
 
 Acknowledgments:
@@ -68,7 +96,7 @@ Acknowledgments:
 
 Copyright notice:
 
- (C) 1995-1996 Jean-loup Gailly and Mark Adler
+ (C) 1995-1998 Jean-loup Gailly and Mark Adler
 
   This software is provided 'as-is', without any express or implied
   warranty.  In no event will the authors be held liable for any damages
@@ -87,7 +115,7 @@ Copyright notice:
   3. This notice may not be removed or altered from any source distribution.
 
   Jean-loup Gailly        Mark Adler
-  gzip@prep.ai.mit.edu    madler@alumni.caltech.edu
+  jloup@gzip.org          madler@alumni.caltech.edu
 
 If you use the zlib library in a product, we would appreciate *not*
 receiving lengthy legal documents to sign. The sources are provided