Import zlib 1.1.3 onto the vendor branch.

Obtained from: ftp.cdrom.com:/pub/infozip/zlib

1 files changed, 49 insertions, 28 deletions

diff --git a/lib/libz/README b/lib/libz/README
index acaea4f..8ff4587 100644
--- a/lib/libz/README
+++ b/lib/libz/README
@@ -1,4 +1,4 @@
-zlib 1.1.1 is a general purpose data compression library.  All the code
+zlib 1.1.3 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
@@ -14,26 +14,41 @@ 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"
-should work for most machines.  For MSDOS, use one of the special
-makefiles such as Makefile.msc; for VMS, use Make_vms.com or descrip.mms.
+should work for most machines. For Unix: "configure; make test; make install"
+For MSDOS, use one of the special 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.
+Questions about zlib should be sent to <zlib@quest.jpl.nasa.gov>, or to
+Gilles Vollant <info@winimage.com> for the Windows DLL version.
 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 1.1.1 are documented in the file ChangeLog.
-The main changes since 1.1.0 are:
+Before reporting a problem, please check those sites to verify that
+you have the latest version of zlib; otherwise get the latest version and
+check whether the problem still exists or not.
 
-- 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.
+Mark Nelson <markn@tiny.com> 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 1.1.3 are documented in the file ChangeLog.
+The main changes since 1.1.2 are:
+
+- fix "an inflate input buffer bug that shows up on rare but persistent
+  occasions" (Mark)
+- fix gzread and gztell for concatenated .gz files (Didier Le Botlan)
+- fix gzseek(..., SEEK_SET) in write mode
+- fix crc check after a gzeek (Frank Faubert)
+- fix miniunzip when the last entry in a zip file is itself a zip file
+  (J Lillge)
+- add contrib/asm586 and contrib/asm686 (Brian Raiter)
+  See http://www.muppetlabs.com/~breadbox/software/assembly.html
+- add support for Delphi 3 in contrib/delphi (Bob Dellaca)
+- add support for C++Builder 3 and Delphi 3 in contrib/delphi2 (Davide Moretti)
+- do not exit prematurely in untgz if 0 at start of block (Magnus Holmgren)
+- use macro EXTERN instead of extern to support DLL for BeOS (Sander Stoks)
+- added a FAQ file
+
+plus many changes for portability.
 
 Unsupported third party contributions are provided in directory "contrib".
 
@@ -46,12 +61,16 @@ 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
+is available in Python 1.5 and later versions, see
+http://www.python.org/doc/lib/module-zlib.html
+
+A zlib binding for TCL written by Andreas Kupries <a.kupries@westend.com>
+is availlable at http://www.westend.com/~kupries/doc/trf/man/man.html
 
-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
+An experimental package to read and write 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
+and also in the contrib/minizip directory of zlib.
 
 
 Notes for some targets:
@@ -64,8 +83,8 @@ Notes for some targets:
 
   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.
+  See contrib/visual-basic.txt for more information, or get
+  http://www.tcfb.com/dowseware/cmp-z-it.zip
 
 - 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
@@ -74,23 +93,25 @@ Notes for some targets:
 - 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.
 
+- on Digital Unix 4.0D (formely OSF/1) on AlphaServer, the cc option -std1
+  is necessary to get gzprintf working correctly. This is done by configure.
+
 - 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.
 
-- 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, 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
 
+- For PalmOs, see http://www.cs.uit.no/~perm/PASTA/pilot/software.html
+  Per Harald Myrvang <perm@stud.cs.uit.no>
+
 
 Acknowledgments:
 
   The deflate format used by zlib was defined by Phil Katz. The deflate
-  and zlib specifications were written by Peter Deutsch. Thanks to all the
+  and zlib specifications were written by L. Peter Deutsch. Thanks to all the
   people who reported problems and suggested various improvements in zlib;
   they are too numerous to cite here.