sl@0: This is an epoc port of zlib (http://www.cdrom.com/pub/infozip/zlib/)
sl@0: 
sl@0: Changes made in getting zlib lib to compile.
sl@0: 
sl@0: General Changes:
sl@0: ------------------
sl@0: 
sl@0: All .c files renamed to .cpp
sl@0: 
sl@0: K&R function defintions are rewritten to conform with ansi C.
sl@0: 
sl@0: 
sl@0: 
sl@0: ZLib.h:
sl@0: ---------
sl@0: Since all our files are going to be .cpp files we don't need the extern c stuff so thats been commented out.
sl@0: At the start of zlib.h, the macros ZEXPORT, ZEXPORTVA are set to nothing.  ZEXTERN is set to IMPORT_C.
sl@0: At the end of zlib.h ZEXTERN is set to nothing.  This is nasty and hacky but it involes the least
sl@0: amount of changes to the zlib code.  Anyway it can go if we decide not to export to c interface.
sl@0: Every exported function has had EXPORT_C appended to its definition.  This affects many files.  Again
sl@0: if we decide not to export the c interface these changes can be reversed.
sl@0: 
sl@0: 
sl@0: ZUtil.h:
sl@0: -----------
sl@0: Includes <e32std.h> at the top.
sl@0: Commented out bit of code which checks moew msvc and messes redefines fdopen as _fdopen.  Lines 139
sl@0: 
sl@0: 
sl@0: 
sl@0: deflate.h:
sl@0: ------------
sl@0: 
sl@0: Added a STATIC_CAST to first two lines of _tr_tally_dist
sl@0: 
sl@0: delate.cpp:
sl@0: ----------
sl@0: 
sl@0: #included <e32def.h>
sl@0: 
sl@0: Altered C style casts in INSERT_STRING macro to STATIC_CAST and added some more casts
sl@0: 
sl@0: Lines 1041 & 1211 commented out.  They contained trhe name of a macro in a piece of code which was
sl@0: #defed out of the compliation process.  Unforntately makmake didn't like it.
sl@0: 
sl@0: MSDOS & MACOS? specific stuff has been commented out.  I guess this should be replace with an appropriate
sl@0: #ifdef but I'm not sure what this should be yet.
sl@0: 
sl@0: Added line 284 
sl@0: s->status = INIT_STATE;
sl@0: to fix zlib bug where a memory leak can occur when zalloc fails
sl@0: 
sl@0: 
sl@0: infblock.cpp
sl@0: -------------
sl@0: 
sl@0: This file has been modified to fix a bug in zlib 1.1.3 which can cause a crash when ZALLOC fails.
sl@0: Essentially what happens is that in certain circumstances s->sub.trees.blens can be deleted twice.
sl@0: I have altered infblock.cpp with a patch sent to me by jloup@gzip.org which fixes this problem.  I guess
sl@0: this fix will appear in zlib 1.1.4.
sl@0: 
sl@0: trees.h:
sl@0: ----------
sl@0: The array sizes specified for _dist_code & _length_code have been removed from the square brackets as
sl@0: it conflicts with another extern definition which appears elsewhere in the code.
sl@0: 
sl@0: trees.cpp:
sl@0: ------------
sl@0: 
sl@0: #included <e32def.h>
sl@0: 
sl@0: STATIC_CASTS added on lines 594, 607, 679, 730, 225
sl@0: 
sl@0: 
sl@0: inftrees.cpp:
sl@0: --------------
sl@0: commented out unused formal parameter z in inflate_trees_fixed at line 399.  Seems to be some global
sl@0: data in here.  Something is going to have to be done about it.
sl@0: 
sl@0: 
sl@0: gzio.cpp:
sl@0: ----------
sl@0: Swapped around includes for zconf.h and stdio.h so we don't get warnings about multiple defintions of 
sl@0: NULL.
sl@0: gzprintf uses to much stack for epoc.  Compliation gives a failure to link with _chkstk.  Rather than 
sl@0: reducing the size of the buffer, I'm going to allocate the buffer on the heap.
sl@0: 
sl@0: 
sl@0: zconf.h
sl@0: -----------
sl@0: Commented out lines that include unistd.h
sl@0: 
sl@0: Global Variables:
sl@0: -------------------
sl@0: Since EPOC cannot support writeable global data some modifications were required to the global variables
sl@0: in zlib.  Conveniently, however, all of the global variables which were no const did not need to be so
sl@0: and I believe their non const status was dues to backward compatibility with older compilers.  The 
sl@0: following global variables were made read only to facilitate a marm build.
sl@0: 
sl@0: inftrees.cpp:
sl@0: -------------
sl@0: 
sl@0: fixed_td
sl@0: fixed_tl
sl@0: inflate_mask
sl@0: 
sl@0: trees.cpp:
sl@0: ----------
sl@0: 
sl@0: static_bl_desc
sl@0: static_d_desc
sl@0: static_l_desc
sl@0: table	
sl@0: z_verbose	
sl@0: 
sl@0: 
sl@0: deflate.cpp:
sl@0: -------------
sl@0: delateInit2::my_version
sl@0: 
sl@0: 
sl@0: Changes made to remove dependency on the c standard library.
sl@0: -------------------------------------------------------------
sl@0: 
sl@0: zutil.h 
sl@0: ----------
sl@0: the following macros are redefined to make use of the Epoc32 Mem class, zmemcpy, zmemcmp,
sl@0: zmemzero.
sl@0: 
sl@0: zutil.cpp
sl@0: ----------
sl@0: zcalloc and zfree now call memory functions defined in User.
sl@0: 
sl@0: 
sl@0: 
sl@0: 
sl@0: