cmake_minimum_required(VERSION 2.4.4...3.15.0)
set(CMAKE_ALLOW_LOOSE_LOOP_CONSTRUCTS ON)

project(zlib C)

set(VERSION "1.3.1")

option(ZLIB_BUILD_EXAMPLES "Enable Zlib Examples" ON)

set(INSTALL_BIN_DIR "${CMAKE_INSTALL_PREFIX}/bin" CACHE PATH "Installation directory for executables")
set(INSTALL_LIB_DIR "${CMAKE_INSTALL_PREFIX}/lib" CACHE PATH "Installation directory for libraries")
set(INSTALL_INC_DIR "${CMAKE_INSTALL_PREFIX}/include" CACHE PATH "Installation directory for headers")
set(INSTALL_MAN_DIR "${CMAKE_INSTALL_PREFIX}/share/man" CACHE PATH "Installation directory for manual pages")
set(INSTALL_PKGCONFIG_DIR "${CMAKE_INSTALL_PREFIX}/share/pkgconfig" CACHE PATH "Installation directory for pkgconfig (.pc) files")

                            -I ${CMAKE_CURRENT_BINARY_DIR}
                            -o ${CMAKE_CURRENT_BINARY_DIR}/zlib1rc.obj
                            -i ${CMAKE_CURRENT_SOURCE_DIR}/win32/zlib1.rc)
    set(ZLIB_DLL_SRCS ${CMAKE_CURRENT_BINARY_DIR}/zlib1rc.obj)
endif(MINGW)

add_library(zlib SHARED ${ZLIB_SRCS} ${ZLIB_DLL_SRCS} ${ZLIB_PUBLIC_HDRS} ${ZLIB_PRIVATE_HDRS})
target_include_directories(zlib PUBLIC ${CMAKE_CURRENT_BINARY_DIR} ${CMAKE_CURRENT_SOURCE_DIR})
add_library(zlibstatic STATIC ${ZLIB_SRCS} ${ZLIB_PUBLIC_HDRS} ${ZLIB_PRIVATE_HDRS})
target_include_directories(zlibstatic PUBLIC ${CMAKE_CURRENT_BINARY_DIR} ${CMAKE_CURRENT_SOURCE_DIR})
set_target_properties(zlib PROPERTIES DEFINE_SYMBOL ZLIB_DLL)
set_target_properties(zlib PROPERTIES SOVERSION 1)

if(NOT CYGWIN)
    # This property causes shared libraries on Linux to have the full version
    # encoded into their final filename.  We disable this on Cygwin because
    # it causes cygz-${ZLIB_FULL_VERSION}.dll to be created when cygz.dll
    # seems to be the default.
    #
    # This has no effect with MSVC, on that platform the version info for
    # the DLL comes from the resource file win32/zlib1.rc
    set_target_properties(zlib PROPERTIES VERSION ${ZLIB_FULL_VERSION})
endif()

if(UNIX)
    # On unix-like platforms the library is almost always called libz
   set_target_properties(zlib zlibstatic PROPERTIES OUTPUT_NAME z)
   if(NOT APPLE AND NOT(CMAKE_SYSTEM_NAME STREQUAL AIX))
     set_target_properties(zlib PROPERTIES LINK_FLAGS "-Wl,--version-script,\"${CMAKE_CURRENT_SOURCE_DIR}/zlib.map\"")
   endif()
elseif(BUILD_SHARED_LIBS AND WIN32)
    # Creates zlib1.dll when building shared library version
    set_target_properties(zlib PROPERTIES SUFFIX "1.dll")
endif()

if(NOT SKIP_INSTALL_FILES AND NOT SKIP_INSTALL_ALL )
    install(FILES ${ZLIB_PC} DESTINATION "${INSTALL_PKGCONFIG_DIR}")
endif()

#============================================================================
# Example binaries
#============================================================================
if(ZLIB_BUILD_EXAMPLES)
    add_executable(example test/example.c)
    target_link_libraries(example zlib)
    add_test(example example)

    add_executable(minigzip test/minigzip.c)
    target_link_libraries(minigzip zlib)

    if(HAVE_OFF64_T)
        add_executable(example64 test/example.c)
        target_link_libraries(example64 zlib)
        set_target_properties(example64 PROPERTIES COMPILE_FLAGS "-D_FILE_OFFSET_BITS=64")
        add_test(example64 example64)

        add_executable(minigzip64 test/minigzip.c)
        target_link_libraries(minigzip64 zlib)
        set_target_properties(minigzip64 PROPERTIES COMPILE_FLAGS "-D_FILE_OFFSET_BITS=64")
    endif()
endif()

                ChangeLog file for zlib

Changes in 1.3.1 (22 Jan 2024)
- Reject overflows of zip header fields in minizip
- Fix bug in inflateSync() for data held in bit buffer
- Add LIT_MEM define to use more memory for a small deflate speedup
- Fix decision on the emission of Zip64 end records in minizip
- Add bounds checking to ERR_MSG() macro, used by zError()
- Neutralize zip file traversal attacks in miniunz
- Fix a bug in ZLIB_DEBUG compiles in check_match()
- Various portability and appearance improvements

Changes in 1.3 (18 Aug 2023)
- Remove K&R function definitions and zlib2ansi
- Fix bug in deflateBound() for level 0 and memLevel 9
- Fix bug when gzungetc() is used immediately after gzopen()
- Fix bug when using gzflush() with a very small buffer
- Fix crash when gzsetparams() attempted for transparent write
- Fix test/example.c to work with FORCE_STORED

 1. Is zlib Y2K-compliant?

    Yes. zlib doesn't handle dates.

 2. Where can I get a Windows DLL version?

    The zlib sources can be compiled without change to produce a DLL.  See the
    file win32/DLL_FAQ.txt in the zlib distribution.


 3. Where can I get a Visual Basic interface to zlib?

    See
        * http://marknelson.us/1997/01/01/zlib-engine/
        * win32/DLL_FAQ.txt in the zlib distribution

# Makefile for zlib
# Copyright (C) 1995-2024 Jean-loup Gailly, Mark Adler
# For conditions of distribution and use, see copyright notice in zlib.h

# To compile and test, type:
#    ./configure; make test
# Normally configure builds both a static and a shared library.
# If you want to build just a static library, use: ./configure --static

#CFLAGS=-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7
#CFLAGS=-g -DZLIB_DEBUG
#CFLAGS=-O3 -Wall -Wwrite-strings -Wpointer-arith -Wconversion \
#           -Wstrict-prototypes -Wmissing-prototypes

SFLAGS=-O
LDFLAGS=
TEST_LIBS=-L. libz.a
LDSHARED=$(CC)
CPP=$(CC) -E

STATICLIB=libz.a
SHAREDLIB=libz.so
SHAREDLIBV=libz.so.1.3.1
SHAREDLIBM=libz.so.1
LIBS=$(STATICLIB) $(SHAREDLIBV)

AR=ar
ARFLAGS=rc
RANLIB=ranlib
LDCONFIG=ldconfig

	$(LDSHARED) $(SFLAGS) -o $@ $(PIC_OBJS) $(LDSHAREDLIBC) $(LDFLAGS)
	rm -f $(SHAREDLIB) $(SHAREDLIBM)
	ln -s $@ $(SHAREDLIB)
	ln -s $@ $(SHAREDLIBM)
	-@rmdir objs

example$(EXE): example.o $(STATICLIB)
	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ example.o $(TEST_LIBS)

minigzip$(EXE): minigzip.o $(STATICLIB)
	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ minigzip.o $(TEST_LIBS)

examplesh$(EXE): example.o $(SHAREDLIBV)
	$(CC) $(CFLAGS) -o $@ example.o $(LDFLAGS) -L. $(SHAREDLIBV)

minigzipsh$(EXE): minigzip.o $(SHAREDLIBV)
	$(CC) $(CFLAGS) -o $@ minigzip.o $(LDFLAGS) -L. $(SHAREDLIBV)

example64$(EXE): example64.o $(STATICLIB)
	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ example64.o $(TEST_LIBS)

minigzip64$(EXE): minigzip64.o $(STATICLIB)
	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ minigzip64.o $(TEST_LIBS)

install-libs: $(LIBS)
	-@if [ ! -d $(DESTDIR)$(exec_prefix)  ]; then mkdir -p $(DESTDIR)$(exec_prefix); fi
	-@if [ ! -d $(DESTDIR)$(libdir)       ]; then mkdir -p $(DESTDIR)$(libdir); fi
	-@if [ ! -d $(DESTDIR)$(sharedlibdir) ]; then mkdir -p $(DESTDIR)$(sharedlibdir); fi
	-@if [ ! -d $(DESTDIR)$(man3dir)      ]; then mkdir -p $(DESTDIR)$(man3dir); fi
	-@if [ ! -d $(DESTDIR)$(pkgconfigdir) ]; then mkdir -p $(DESTDIR)$(pkgconfigdir); fi

	touch -r $(SRCDIR)zconf.h.in $@ &&\
	rm $$TEMPFILE

zconf: $(SRCDIR)zconf.h.in
	cp -p $(SRCDIR)zconf.h.in zconf.h

minizip-test: static
	cd contrib/minizip && { CC="$(CC)" CFLAGS="$(CFLAGS)" $(MAKE) test ; cd ../.. ; }

minizip-clean:
	cd contrib/minizip && { $(MAKE) clean ; cd ../.. ; }

mostlyclean: clean
clean: minizip-clean
	rm -f *.o *.lo *~ \

ZLIB DATA COMPRESSION LIBRARY

zlib 1.3.1 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
http://tools.ietf.org/html/rfc1950 (zlib format), rfc1951 (deflate format) and
rfc1952 (gzip format).

All functions of the compression library are documented in the file zlib.h
(volunteer to write man pages welcome, contact zlib@gzip.org).  A usage example

PLEASE read the zlib FAQ http://zlib.net/zlib_faq.html before asking for help.

Mark Nelson <markn@ieee.org> wrote an article about zlib for the Jan.  1997
issue of Dr.  Dobb's Journal; a copy of the article is available at
https://marknelson.us/posts/1997/01/01/zlib-engine.html .

The changes made in version 1.3.1 are documented in the file ChangeLog.

Unsupported third party contributions are provided in directory contrib/ .

zlib is available in Java using the java.util.zip package. Follow the API
Documentation link at: https://docs.oracle.com/search/?q=java.util.zip .

A Perl interface to zlib and bzip2 written by Paul Marquess <pmqs@cpan.org>

  The deflate format used by zlib was defined by Phil Katz.  The deflate 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.

Copyright notice:

 (C) 1995-2024 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
  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

# get source directory
SRCDIR=`dirname $0`
if test $SRCDIR = "."; then
    ZINC=""
    ZINCOUT="-I."
    SRCDIR=""
else
    ZINC='-I. -include zconf.h'
    ZINCOUT='-I. -I$(SRCDIR)'
    SRCDIR="$SRCDIR/"
fi

# set command prefix for cross-compilation
if [ -n "${CHOST}" ]; then
    uname=${CHOST}
    mname=${CHOST}
    CROSS_PREFIX="${CHOST}-"
else
    mname=`(uname -a || echo unknown) 2>/dev/null`
fi

# destination name for static library
STATICLIB=libz.a

# extract zlib version numbers from zlib.h
VER=`sed -n -e '/VERSION "/s/.*"\(.*\)".*/\1/p' < ${SRCDIR}zlib.h`
VER3=`echo ${VER}|sed -n -e 's/\([0-9]\{1,\}\(\\.[0-9]\{1,\}\)\{1,2\}\).*/\1/p'`
VER1=`echo ${VER}|sed -n -e 's/\([0-9]\{1,\}\)\\..*/\1/p'`

# establish commands for library building
if "${CROSS_PREFIX}ar" --version >/dev/null 2>/dev/null || test $? -lt 126; then
    AR=${AR-"${CROSS_PREFIX}ar"}
    test -n "${CROSS_PREFIX}" && echo Using ${AR} | tee -a configure.log
else
    AR=${AR-"ar"}

  AIX*)
        LDFLAGS="${LDFLAGS} -Wl,-brtl" ;;
  Darwin* | darwin* | *-darwin*)
        shared_ext='.dylib'
        SHAREDLIB=libz$shared_ext
        SHAREDLIBV=libz.$VER$shared_ext
        SHAREDLIBM=libz.$VER1$shared_ext
        LDSHARED=${LDSHARED-"$cc -dynamiclib -install_name $libdir/$SHAREDLIBM -compatibility_version $VER1 -current_version $VER3"}
        if "${CROSS_PREFIX}libtool" -V 2>&1 | grep Apple > /dev/null; then
            AR="${CROSS_PREFIX}libtool"
        elif libtool -V 2>&1 | grep Apple > /dev/null; then
            AR="libtool"
        else
            AR="/usr/bin/libtool"
        fi

cat > $test.c <<EOF
extern int getchar();
int hello() {return getchar();}
EOF
if test $shared -eq 1; then
  echo Checking for shared library support... | tee -a configure.log
  # we must test in two steps (cc then ld), required at least on SunOS 4.x
  if try $CC -c $SFLAGS $test.c &&
     try $LDSHARED $SFLAGS -o $test$shared_ext $test.o; then
    echo Building shared library $SHAREDLIBV with $CC. | tee -a configure.log
  elif test -z "$old_cc" -a -z "$old_cflags"; then
    echo No shared library support. | tee -a configure.log
    shared=0;
  else
    echo 'No shared library support; try without defining CC and CFLAGS' | tee -a configure.log

       InBytes = number of bytes in InBuf
  Out: OutBuf = ptr to user-allocated buffer to contain decompressed data
       BufSize = number of bytes in OutBuf   }
procedure DecompressToUserBuf(const InBuf: Pointer; InBytes: Integer;
  const OutBuf: Pointer; BufSize: Integer);

const
  zlib_version = '1.3.1';

type
  EZlibError = class(Exception);
  ECompressionError = class(EZlibError);
  EDecompressionError = class(EZlibError);

implementation

        /// </summary>
        public ChecksumGeneratorBase()
        {
            _current = 0;
        }

        /// <summary>
        /// Initializes a new instance of the checksum generator base with a specified value
        /// </summary>
        /// <param name="initialValue">The value to set the current checksum to</param>
        public ChecksumGeneratorBase(uint initialValue)
        {
            _current = initialValue;
        }

    public class InfoTests
    {
        #region Info tests
        [Test]
        public void Info_Version()
        {
            Info info = new Info();
            Assert.AreEqual("1.3.1", Info.Version);
            Assert.AreEqual(32, info.SizeOfUInt);
            Assert.AreEqual(32, info.SizeOfULong);
            Assert.AreEqual(32, info.SizeOfPointer);
            Assert.AreEqual(32, info.SizeOfOffset);
        }
        #endregion
    }

/* inftree9.c -- generate Huffman trees for efficient decoding
 * Copyright (C) 1995-2024 Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h
 */

#include "zutil.h"
#include "inftree9.h"

#define MAXBITS 15

const char inflate9_copyright[] =
   " inflate9 1.3.1 Copyright 1995-2024 Mark Adler ";
/*
  If you use the zlib library in a product, an acknowledgment is welcome
  in the documentation of your product. If for some reason you cannot
  include such an acknowledgment, I would appreciate that you keep this
  copyright string in the executable of your product.
 */

    static const unsigned short lbase[31] = { /* Length codes 257..285 base */
        3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17,
        19, 23, 27, 31, 35, 43, 51, 59, 67, 83, 99, 115,
        131, 163, 195, 227, 3, 0, 0};
    static const unsigned short lext[31] = { /* Length codes 257..285 extra */
        128, 128, 128, 128, 128, 128, 128, 128, 129, 129, 129, 129,
        130, 130, 130, 130, 131, 131, 131, 131, 132, 132, 132, 132,
        133, 133, 133, 133, 144, 203, 77};
    static const unsigned short dbase[32] = { /* Distance codes 0..31 base */
        1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49,
        65, 97, 129, 193, 257, 385, 513, 769, 1025, 1537, 2049, 3073,
        4097, 6145, 8193, 12289, 16385, 24577, 32769, 49153};
    static const unsigned short dext[32] = { /* Distance codes 0..31 extra */
        128, 128, 128, 128, 129, 129, 130, 130, 131, 131, 132, 132,
        133, 133, 134, 134, 135, 135, 136, 136, 137, 137, 138, 138,

/* Maximum size of the dynamic table.  The maximum number of code structures is
   1446, which is the sum of 852 for literal/length codes and 594 for distance
   codes.  These values were found by exhaustive searches using the program
   examples/enough.c found in the zlib distribution.  The arguments to that
   program are the number of symbols, the initial root table size, and the
   maximum bit length of a code.  "enough 286 9 15" for literal/length codes
   returns 852, and "enough 32 6 15" for distance codes returns 594. The
   initial root table size (9 or 6) is found in the fifth argument of the
   inflate_table() calls in infback9.c.  If the root table size is changed,
   then these maximum sizes would be need to be recalculated and updated. */
#define ENOUGH_LENS 852
#define ENOUGH_DISTS 594
#define ENOUGH (ENOUGH_LENS+ENOUGH_DISTS)

/* Type of code to build for inflate_table9() */

 *  This class defines a two-argument manipulator for gzofstream. It is used
 *  as base for the setcompression(int,int) manipulator.
*/
template<typename T1, typename T2>
  class gzomanip2
  {
  public:
    // Allows inserter to peek at internals
    template <typename Ta, typename Tb>
      friend gzofstream&
      operator<<(gzofstream&,
                 const gzomanip2<Ta,Tb>&);

    // Constructor
    gzomanip2(gzofstream& (*f)(gzofstream&, T1, T2),

  inline
  gzomanip2<T1,T2>::gzomanip2(gzofstream &(*f)(gzofstream &, T1, T2),
                              T1 v1,
                              T2 v2)
  : func(f), val1(v1), val2(v2)
  { }

// Inserter applies underlying manipulator function to stream
template<typename T1, typename T2>
  inline gzofstream&
  operator<<(gzofstream& s, const gzomanip2<T1,T2>& m)
  { return (*m.func)(s, m.val1, m.val2); }

// Insert this onto stream to simplify setting of compression level
inline gzomanip2<int,int>
setcompression(int l, int s = Z_DEFAULT_STRATEGY)
{ return gzomanip2<int,int>(&setcompression, l, s); }

#endif // ZFSTREAM_H

CC?=cc
CFLAGS := $(CFLAGS) -O -I../..

UNZ_OBJS = miniunz.o unzip.o ioapi.o ../../libz.a
ZIP_OBJS = minizip.o zip.o   ioapi.o ../../libz.a

.c.o:
	$(CC) -c $(CFLAGS) $*.c

#                                               -*- Autoconf -*-
# Process this file with autoconf to produce a configure script.

AC_INIT([minizip], [1.3.1], [bugzilla.redhat.com])
AC_CONFIG_SRCDIR([minizip.c])
AM_INIT_AUTOMAKE([foreign])
LT_INIT

AC_MSG_CHECKING([whether to build example programs])
AC_ARG_ENABLE([demos], AC_HELP_STRING([--enable-demos], [build example programs]))
AM_CONDITIONAL([COND_DEMOS], [test "$enable_demos" = yes])

typedef int      (ZCALLBACK *close_file_func)     (voidpf opaque, voidpf stream);
typedef int      (ZCALLBACK *testerror_file_func) (voidpf opaque, voidpf stream);

typedef long     (ZCALLBACK *tell_file_func)      (voidpf opaque, voidpf stream);
typedef long     (ZCALLBACK *seek_file_func)      (voidpf opaque, voidpf stream, uLong offset, int origin);


/* here is the "old" 32 bits structure */
typedef struct zlib_filefunc_def_s
{
    open_file_func      zopen_file;
    read_file_func      zread_file;
    write_file_func     zwrite_file;
    tell_file_func      ztell_file;
    seek_file_func      zseek_file;

  list the file in the zipfile, and print the content of FILE_ID.ZIP or README.TXT
    if it exists
*/


/* change_file_date : change the date/time of a file
    filename : the filename of the file where date/time must be modified
    dosdate : the new date at the MSDOS format (4 bytes)
    tmu_date : the SAME new date at the tm_unz format */
static void change_file_date(const char *filename, uLong dosdate, tm_unz tmu_date) {
#ifdef _WIN32
  HANDLE hFile;
  FILETIME ftm,ftLocal,ftCreate,ftLastAcc,ftLastWrite;

  hFile = CreateFileA(filename,GENERIC_READ | GENERIC_WRITE,

      *p++ = hold;
    }
  free(buffer);
  return 1;
}

static void do_banner(void) {
    printf("MiniUnz 1.1, demo of zLib + Unz package written by Gilles Vollant\n");
    printf("more info at http://www.winimage.com/zLibDll/unzip.html\n\n");
}

static void do_help(void) {
    printf("Usage : miniunz [-e] [-x] [-v] [-l] [-o] [-p password] file.zip [file_to_extr.] [-d extractdir]\n\n" \
           "  -e  Extract without pathname (junk paths)\n" \
           "  -x  Extract with pathname\n" \

        const char* write_filename;
        int skip=0;

        if ((*popt_extract_without_path)==0)
            write_filename = filename_inzip;
        else
            write_filename = filename_withoutpath;

        if (write_filename[0]!='\0')
        {
            const char* relative_check = write_filename;
            while (relative_check[1]!='\0')
            {
                if (relative_check[0]=='.' && relative_check[1]=='.')
                    write_filename = relative_check;
                relative_check++;
            }
        }

        while (write_filename[0]=='/' || write_filename[0]=='.')
            write_filename++;

        err = unzOpenCurrentFilePassword(uf,password);
        if (err!=UNZ_OK)
        {
            printf("error %d with zipfile in unzOpenCurrentFilePassword\n",err);
        }

#define SIZECENTRALDIRITEM (0x2e)
#define SIZEZIPLOCALHEADER (0x1e)


const char unz_copyright[] =
   " unzip 1.01 Copyright 1998-2004 Gilles Vollant - http://www.winimage.com/zLibDll";

/* unz_file_info64_internal contain internal info about a file in zipfile*/
typedef struct unz_file_info64_internal_s
{
    ZPOS64_T offset_curfile;/* relative offset of local header 8 bytes */
} unz_file_info64_internal;


/* file_in_zip_read_info_s contain internal information about a file in zipfile,

    if (ZSEEK64(*pzlib_filefunc_def,filestream, uPosFound,ZLIB_FILEFUNC_SEEK_SET)!=0)
        return CENTRALDIRINVALID;

    /* the signature, already checked */
    if (unz64local_getLong(pzlib_filefunc_def,filestream,&uL)!=UNZ_OK)
        return CENTRALDIRINVALID;

    /* number of the disk with the start of the zip64 end of central directory */
    if (unz64local_getLong(pzlib_filefunc_def,filestream,&uL)!=UNZ_OK)
        return CENTRALDIRINVALID;
    if (uL != 0)
        return CENTRALDIRINVALID;

    /* relative offset of the zip64 end of central directory record */
    if (unz64local_getLong64(pzlib_filefunc_def,filestream,&relativeOffset)!=UNZ_OK)

                              zlib_filefunc64_32_def* pzlib_filefunc64_32_def,
                              int is64bitOpenFunction) {
    unz64_s us;
    unz64_s *s;
    ZPOS64_T central_pos;
    uLong   uL;

    uLong number_disk;          /* number of the current disk, used for
                                   spanning ZIP, unsupported, always 0*/
    uLong number_disk_with_CD;  /* number the disk with central dir, used
                                   for spanning ZIP, unsupported, always 0*/
    ZPOS64_T number_entry_CD;      /* total number of entries in
                                   the central dir
                                   (same than number_entry on nospan) */

    int err=UNZ_OK;

                                         uLong extraFieldBufferSize,
                                         char *szComment,
                                         uLong commentBufferSize);
/*
  Get Info about the current file
  if pfile_info!=NULL, the *pfile_info structure will contain some info about
        the current file
  if szFileName!=NULL, the filename string will be copied in szFileName
            (fileNameBufferSize is the size of the buffer)
  if extraField!=NULL, the extra field information will be copied in extraField
            (extraFieldBufferSize is the size of the buffer).
            This is the Central-header version of the extra field
  if szComment!=NULL, the comment string of the file will be copied in szComment
            (commentBufferSize is the size of the buffer)
*/

  if (ZSEEK64(*pzlib_filefunc_def,filestream, uPosFound,ZLIB_FILEFUNC_SEEK_SET)!=0)
    return 0;

  /* the signature, already checked */
  if (zip64local_getLong(pzlib_filefunc_def,filestream,&uL)!=ZIP_OK)
    return 0;

  /* number of the disk with the start of the zip64 end of central directory */
  if (zip64local_getLong(pzlib_filefunc_def,filestream,&uL)!=ZIP_OK)
    return 0;
  if (uL != 0)
    return 0;

  /* relative offset of the zip64 end of central directory record */
  if (zip64local_getLong64(pzlib_filefunc_def,filestream,&relativeOffset)!=ZIP_OK)

  ZPOS64_T byte_before_the_zipfile;/* byte before the zipfile, (>0 for sfx)*/

  ZPOS64_T size_central_dir;     /* size of the central directory  */
  ZPOS64_T offset_central_dir;   /* offset of start of central directory */
  ZPOS64_T central_pos;
  uLong uL;

  uLong number_disk;          /* number of the current disk, used for
                              spanning ZIP, unsupported, always 0*/
  uLong number_disk_with_CD;  /* number of the disk with central dir, used
                              for spanning ZIP, unsupported, always 0*/
  ZPOS64_T number_entry;
  ZPOS64_T number_entry_CD;      /* total number of entries in
                                the central dir
                                (same than number_entry on nospan) */
  uLong VersionMadeBy;
  uLong VersionNeeded;

#ifdef HAVE_BZIP2
    if ((method!=0) && (method!=Z_DEFLATED) && (method!=Z_BZIP2ED))
      return ZIP_PARAMERROR;
#else
    if ((method!=0) && (method!=Z_DEFLATED))
      return ZIP_PARAMERROR;
#endif

    // The filename and comment length must fit in 16 bits.
    if ((filename!=NULL) && (strlen(filename)>0xffff))
        return ZIP_PARAMERROR;
    if ((comment!=NULL) && (strlen(comment)>0xffff))
        return ZIP_PARAMERROR;
    // The extra field length must fit in 16 bits. If the member also requires
    // a Zip64 extra block, that will also need to fit within that 16-bit
    // length, but that will be checked for later.
    if ((size_extrafield_local>0xffff) || (size_extrafield_global>0xffff))
        return ZIP_PARAMERROR;

    zi = (zip64_internal*)file;

    if (zi->in_opened_file_inzip == 1)
    {
        err = zipCloseFileInZip (file);
        if (err != ZIP_OK)

    if(datasize > 0)
    {
      char* p = NULL;

      if((uLong)(datasize + 4) > zi->ci.size_centralExtraFree)
      {
        // we cannot write more data to the buffer that we have room for.
        return ZIP_BADZIPFILE;
      }

      p = zi->ci.central_header + zi->ci.size_centralheader;

      // Add Extra Information Header for 'ZIP64 information'
      zip64local_putValue_inmemory(p, 0x0001, 2); // HeaderID

            size_centraldir += ldi->filled_in_this_block;
            ldi = ldi->next_datablock;
        }
    }
    free_linkedlist(&(zi->central_dir));

    pos = centraldir_pos_inzip - zi->add_position_when_writing_offset;
    if(pos >= 0xffffffff || zi->number_entry >= 0xFFFF)
    {
      ZPOS64_T Zip64EOCDpos = ZTELL64(zi->z_filefunc,zi->filestream);
      Write_Zip64EndOfCentralDirectoryRecord(zi, size_centraldir, centraldir_pos_inzip);

      Write_Zip64EndOfCentralDirectoryLocator(zi, Zip64EOCDpos);
    }

                                         int zip64);

/*
  Open a file in the ZIP for writing.
  filename : the filename in zip (if NULL, '-' without quote will be used
  *zipfi contain supplemental information
  if extrafield_local!=NULL and size_extrafield_local>0, extrafield_local
    contains the extrafield data for the local header
  if extrafield_global!=NULL and size_extrafield_global>0, extrafield_global
    contains the extrafield data for the global header
  if comment != NULL, comment contain the comment string
  method contain the compression method (0 for store, Z_DEFLATED for deflate)
  level contain the level of compression (can be Z_DEFAULT_COMPRESSION)
  zip64 is set to 1 if a zip64 extended information block should be added to the local file header.
                    this MUST be '1' if the uncompressed size is >= 0xffffffff.

*/

(* zlibpas -- Pascal interface to the zlib data compression library
 *
 * Copyright (C) 2003 Cosmin Truta.
 * Derived from original sources by Bob Dellaca.
 * For conditions of distribution and use, see copyright notice in readme.txt
 *)

unit zlibpas;

interface

const
  ZLIB_VERSION = '1.3.1';
  ZLIB_VERNUM  = $12a0;

type
  alloc_func = function(opaque: Pointer; items, size: Integer): Pointer;
                 cdecl;
  free_func  = procedure(opaque, address: Pointer);
                 cdecl;

 *   from the number of bits in each code.  Therefore the code descriptions
 *   are simply a list of code lengths for each symbol.
 *
 * - The code lengths are stored in order for the symbols, so lengths are
 *   provided for each of the literal/length symbols, and for each of the
 *   distance symbols.
 *
 * - If a symbol is not used in the block, this is represented by a zero as the
 *   code length.  This does not mean a zero-length code, but rather that no
 *   code should be created for this symbol.  There is no way in the deflate
 *   format to represent a zero-length code.
 *
 * - The maximum number of bits in a code is 15, so the possible lengths for
 *   any code are 1..15.
 *
 * - The fact that a length of zero is not permitted for a code has an
 *   interesting consequence.  Normally if only one symbol is used for a given
 *   code, then in fact that code could be represented with zero bits.  However

Building instructions for the DLL versions of Zlib 1.3.1
========================================================

This directory contains projects that build zlib and minizip using
Microsoft Visual C++ 9.0/10.0.

You don't need to build these projects yourself. You can download the
binaries from:

- Open contrib\vstudio\vc12\zlibvc.sln with Microsoft Visual C++ 2013

Build instructions for Visual Studio 2015 (32 bits or 64 bits)
--------------------------------------------------------------
- Decompress current zlib, including all contrib/* files
- Open contrib\vstudio\vc14\zlibvc.sln with Microsoft Visual C++ 2015

Build instructions for Visual Studio 2022 (64 bits)
--------------------------------------------------------------
- Decompress current zlib, including all contrib/* files
- Open contrib\vstudio\vc143\zlibvc.sln with Microsoft Visual C++ 2022



Important
---------
- To use zlibwapi.dll in your application, you must define the
  macro ZLIB_WINAPI when compiling your application's source files.

  has a slightly different effect. To avoid compatibility problems, do
  not define it here.


Gilles Vollant
info@winimage.com

Visual Studio 2013, 2015, and 2022 Projects from Sean Hunt
seandhunt_7@yahoo.com

#include <windows.h>

#define IDR_VERSION1  1
IDR_VERSION1	VERSIONINFO	MOVEABLE IMPURE LOADONCALL DISCARDABLE
  FILEVERSION	 1, 3, 1, 0
  PRODUCTVERSION 1, 3, 1, 0
  FILEFLAGSMASK	VS_FFI_FILEFLAGSMASK
  FILEFLAGS	0
  FILEOS	VOS_DOS_WINDOWS32
  FILETYPE	VFT_DLL
  FILESUBTYPE	0	// not used
BEGIN
  BLOCK "StringFileInfo"
  BEGIN
    BLOCK "040904E4"
    //language ID = U.S. English, char set = Windows, Multilingual

    BEGIN
      VALUE "FileDescription", "zlib data compression and ZIP file I/O library\0"
      VALUE "FileVersion",	"1.3.1\0"
      VALUE "InternalName",	"zlib\0"
      VALUE "OriginalFilename",	"zlibwapi.dll\0"
      VALUE "ProductName",	"ZLib.DLL\0"
      VALUE "Comments","DLL support by Alessandro Iacopetti & Gilles Vollant\0"
      VALUE "LegalCopyright", "(C) 1995-2024 Jean-loup Gailly & Mark Adler\0"
    END
  END
  BLOCK "VarFileInfo"
  BEGIN
    VALUE "Translation", 0x0409, 1252
  END
END

LIBRARY
; zlib data compression and ZIP file I/O library

VERSION		1.3.1

EXPORTS
        adler32                                  @1
        compress                                 @2
        crc32                                    @3
        deflate                                  @4
        deflateCopy                              @5

#include <windows.h>

#define IDR_VERSION1  1
IDR_VERSION1	VERSIONINFO	MOVEABLE IMPURE LOADONCALL DISCARDABLE
  FILEVERSION	 1, 3, 1, 0
  PRODUCTVERSION 1, 3, 1, 0
  FILEFLAGSMASK	VS_FFI_FILEFLAGSMASK
  FILEFLAGS	0
  FILEOS	VOS_DOS_WINDOWS32
  FILETYPE	VFT_DLL
  FILESUBTYPE	0	// not used
BEGIN
  BLOCK "StringFileInfo"
  BEGIN
    BLOCK "040904E4"
    //language ID = U.S. English, char set = Windows, Multilingual

    BEGIN
      VALUE "FileDescription", "zlib data compression and ZIP file I/O library\0"
      VALUE "FileVersion",	"1.3.1\0"
      VALUE "InternalName",	"zlib\0"
      VALUE "OriginalFilename",	"zlibwapi.dll\0"
      VALUE "ProductName",	"ZLib.DLL\0"
      VALUE "Comments","DLL support by Alessandro Iacopetti & Gilles Vollant\0"
      VALUE "LegalCopyright", "(C) 1995-2024 Jean-loup Gailly & Mark Adler\0"
    END
  END
  BLOCK "VarFileInfo"
  BEGIN
    VALUE "Translation", 0x0409, 1252
  END
END

LIBRARY
; zlib data compression and ZIP file I/O library

VERSION		1.3.1

EXPORTS
        adler32                                  @1
        compress                                 @2
        crc32                                    @3
        deflate                                  @4
        deflateCopy                              @5

#include <windows.h>

#define IDR_VERSION1  1
IDR_VERSION1	VERSIONINFO	MOVEABLE IMPURE LOADONCALL DISCARDABLE
  FILEVERSION	 1, 3, 1, 0
  PRODUCTVERSION 1, 3, 1, 0
  FILEFLAGSMASK	VS_FFI_FILEFLAGSMASK
  FILEFLAGS	0
  FILEOS	VOS_DOS_WINDOWS32
  FILETYPE	VFT_DLL
  FILESUBTYPE	0	// not used
BEGIN
  BLOCK "StringFileInfo"
  BEGIN
    BLOCK "040904E4"
    //language ID = U.S. English, char set = Windows, Multilingual

    BEGIN
      VALUE "FileDescription", "zlib data compression and ZIP file I/O library\0"
      VALUE "FileVersion",	"1.3.1\0"
      VALUE "InternalName",	"zlib\0"
      VALUE "OriginalFilename",	"zlibwapi.dll\0"
      VALUE "ProductName",	"ZLib.DLL\0"
      VALUE "Comments","DLL support by Alessandro Iacopetti & Gilles Vollant\0"
      VALUE "LegalCopyright", "(C) 1995-2024 Jean-loup Gailly & Mark Adler\0"
    END
  END
  BLOCK "VarFileInfo"
  BEGIN
    VALUE "Translation", 0x0409, 1252
  END
END

LIBRARY
; zlib data compression and ZIP file I/O library

VERSION		1.3.1

EXPORTS
        adler32                                  @1
        compress                                 @2
        crc32                                    @3
        deflate                                  @4
        deflateCopy                              @5

#include <windows.h>

#define IDR_VERSION1  1
IDR_VERSION1	VERSIONINFO	MOVEABLE IMPURE LOADONCALL DISCARDABLE
  FILEVERSION	 1, 3, 1, 0
  PRODUCTVERSION 1, 3, 1, 0
  FILEFLAGSMASK	VS_FFI_FILEFLAGSMASK
  FILEFLAGS	0
  FILEOS	VOS_DOS_WINDOWS32
  FILETYPE	VFT_DLL
  FILESUBTYPE	0	// not used
BEGIN
  BLOCK "StringFileInfo"
  BEGIN
    BLOCK "040904E4"
    //language ID = U.S. English, char set = Windows, Multilingual

    BEGIN
      VALUE "FileDescription", "zlib data compression and ZIP file I/O library\0"
      VALUE "FileVersion",	"1.3.1\0"
      VALUE "InternalName",	"zlib\0"
      VALUE "OriginalFilename",	"zlibwapi.dll\0"
      VALUE "ProductName",	"ZLib.DLL\0"
      VALUE "Comments","DLL support by Alessandro Iacopetti & Gilles Vollant\0"
      VALUE "LegalCopyright", "(C) 1995-2024 Jean-loup Gailly & Mark Adler\0"
    END
  END
  BLOCK "VarFileInfo"
  BEGIN
    VALUE "Translation", 0x0409, 1252
  END
END

LIBRARY
; zlib data compression and ZIP file I/O library

VERSION		1.3.1

EXPORTS
        adler32                                  @1
        compress                                 @2
        crc32                                    @3
        deflate                                  @4
        deflateCopy                              @5

#include <windows.h>

#define IDR_VERSION1  1
IDR_VERSION1	VERSIONINFO	MOVEABLE IMPURE LOADONCALL DISCARDABLE
  FILEVERSION	 1, 3, 1, 0
  PRODUCTVERSION 1, 3, 1, 0
  FILEFLAGSMASK	VS_FFI_FILEFLAGSMASK
  FILEFLAGS	0
  FILEOS	VOS_DOS_WINDOWS32
  FILETYPE	VFT_DLL
  FILESUBTYPE	0	// not used
BEGIN
  BLOCK "StringFileInfo"
  BEGIN
    BLOCK "040904E4"
    //language ID = U.S. English, char set = Windows, Multilingual

    BEGIN
      VALUE "FileDescription", "zlib data compression and ZIP file I/O library\0"
      VALUE "FileVersion",	"1.3.1\0"
      VALUE "InternalName",	"zlib\0"
      VALUE "OriginalFilename",	"zlibwapi.dll\0"
      VALUE "ProductName",	"ZLib.DLL\0"
      VALUE "Comments","DLL support by Alessandro Iacopetti & Gilles Vollant\0"
      VALUE "LegalCopyright", "(C) 1995-2024 Jean-loup Gailly & Mark Adler\0"
    END
  END
  BLOCK "VarFileInfo"
  BEGIN
    VALUE "Translation", 0x0409, 1252
  END
END

LIBRARY
; zlib data compression and ZIP file I/O library

VERSION		1.3.1

EXPORTS
        adler32                                  @1
        compress                                 @2
        crc32                                    @3
        deflate                                  @4
        deflateCopy                              @5

/* deflate.c -- compress data using the deflation algorithm
 * Copyright (C) 1995-2024 Jean-loup Gailly and Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h
 */

/*
 *  ALGORITHM
 *
 *      The "deflation" process depends on being able to identify portions

 */

/* @(#) $Id$ */

#include "deflate.h"

const char deflate_copyright[] =
   " deflate 1.3.1 Copyright 1995-2024 Jean-loup Gailly and Mark Adler ";
/*
  If you use the zlib library in a product, an acknowledgment is welcome
  in the documentation of your product. If for some reason you cannot
  include such an acknowledgment, I would appreciate that you keep this
  copyright string in the executable of your product.
 */

     * blocks. A dynamic-code block will only be chosen to be emitted if it has
     * fewer bits than a fixed-code block would for the same set of symbols.
     * Therefore its average symbol length is assured to be less than 31. So
     * the compressed data for a dynamic block also cannot overwrite the
     * symbols from which it is being constructed.
     */

    s->pending_buf = (uchf *) ZALLOC(strm, s->lit_bufsize, LIT_BUFS);
    s->pending_buf_size = (ulg)s->lit_bufsize * 4;

    if (s->window == Z_NULL || s->prev == Z_NULL || s->head == Z_NULL ||
        s->pending_buf == Z_NULL) {
        s->status = FINISH_STATE;
        strm->msg = ERR_MSG(Z_MEM_ERROR);
        deflateEnd (strm);
        return Z_MEM_ERROR;
    }
#ifdef LIT_MEM
    s->d_buf = (ushf *)(s->pending_buf + (s->lit_bufsize << 1));
    s->l_buf = s->pending_buf + (s->lit_bufsize << 2);
    s->sym_end = s->lit_bufsize - 1;
#else
    s->sym_buf = s->pending_buf + s->lit_bufsize;
    s->sym_end = (s->lit_bufsize - 1) * 3;
#endif
    /* We avoid equality with lit_bufsize*3 because of wraparound at 64K
     * on 16 bit machines and because stored blocks are restricted to
     * 64K-1 bytes.
     */

    s->level = level;
    s->strategy = strategy;

/* ========================================================================= */
int ZEXPORT deflatePrime(z_streamp strm, int bits, int value) {
    deflate_state *s;
    int put;

    if (deflateStateCheck(strm)) return Z_STREAM_ERROR;
    s = strm->state;
#ifdef LIT_MEM
    if (bits < 0 || bits > 16 ||
        (uchf *)s->d_buf < s->pending_out + ((Buf_size + 7) >> 3))
        return Z_BUF_ERROR;
#else
    if (bits < 0 || bits > 16 ||
        s->sym_buf < s->pending_out + ((Buf_size + 7) >> 3))
        return Z_BUF_ERROR;
#endif
    do {
        put = Buf_size - s->bi_valid;
        if (put > bits)
            put = bits;
        s->bi_buf |= (ush)((value & ((1 << put) - 1)) << s->bi_valid);
        s->bi_valid += put;
        _tr_flush_bits(s);

    dest->state = (struct internal_state FAR *) ds;
    zmemcpy((voidpf)ds, (voidpf)ss, sizeof(deflate_state));
    ds->strm = dest;

    ds->window = (Bytef *) ZALLOC(dest, ds->w_size, 2*sizeof(Byte));
    ds->prev   = (Posf *)  ZALLOC(dest, ds->w_size, sizeof(Pos));
    ds->head   = (Posf *)  ZALLOC(dest, ds->hash_size, sizeof(Pos));
    ds->pending_buf = (uchf *) ZALLOC(dest, ds->lit_bufsize, LIT_BUFS);

    if (ds->window == Z_NULL || ds->prev == Z_NULL || ds->head == Z_NULL ||
        ds->pending_buf == Z_NULL) {
        deflateEnd (dest);
        return Z_MEM_ERROR;
    }
    /* following zmemcpy do not work for 16-bit MSDOS */
    zmemcpy(ds->window, ss->window, ds->w_size * 2 * sizeof(Byte));
    zmemcpy((voidpf)ds->prev, (voidpf)ss->prev, ds->w_size * sizeof(Pos));
    zmemcpy((voidpf)ds->head, (voidpf)ss->head, ds->hash_size * sizeof(Pos));
    zmemcpy(ds->pending_buf, ss->pending_buf, ds->lit_bufsize * LIT_BUFS);

    ds->pending_out = ds->pending_buf + (ss->pending_out - ss->pending_buf);
#ifdef LIT_MEM
    ds->d_buf = (ushf *)(ds->pending_buf + (ds->lit_bufsize << 1));
    ds->l_buf = ds->pending_buf + (ds->lit_bufsize << 2);
#else
    ds->sym_buf = ds->pending_buf + ds->lit_bufsize;
#endif

    ds->l_desc.dyn_tree = ds->dyn_ltree;
    ds->d_desc.dyn_tree = ds->dyn_dtree;
    ds->bl_desc.dyn_tree = ds->bl_tree;

    return Z_OK;
#endif /* MAXSEG_64K */

/* result of memcmp for equal strings */

/* ===========================================================================
 * Check that the match at match_start is indeed a match.
 */
local void check_match(deflate_state *s, IPos start, IPos match, int length) {
    /* check that the match is indeed a match */
    Bytef *back = s->window + (int)match, *here = s->window + start;
    IPos len = length;
    if (match == (IPos)-1) {
        /* match starts one byte before the current window -- just compare the
           subsequent length-1 bytes */
        back++;
        here++;
        len--;
    }
    if (zmemcmp(back, here, len) != EQUAL) {
        fprintf(stderr, " start %u, match %d, length %d\n",
                start, (int)match, length);
        do {
            fprintf(stderr, "(%02x %02x)", *back++, *here++);
        } while (--len != 0);
        z_error("invalid match");
    }
    if (z_verbose > 1) {
        fprintf(stderr,"\\[%d,%d]", start - match, length);
        do { putc(s->window[start++], stderr); } while (--length != 0);
    }
}

/* deflate.h -- internal compression state
 * Copyright (C) 1995-2024 Jean-loup Gailly
 * For conditions of distribution and use, see copyright notice in zlib.h
 */

/* WARNING: this file should *not* be used by applications. It is
   part of the implementation of the compression library and is
   subject to change. Applications should only use zlib.h.
 */

/* define NO_GZIP when compiling if you want to disable gzip header and
   trailer creation by deflate().  NO_GZIP would be used to avoid linking in
   the crc code when it is not needed.  For shared libraries, gzip encoding
   should be left enabled. */
#ifndef NO_GZIP
#  define GZIP
#endif

/* define LIT_MEM to slightly increase the speed of deflate (order 1% to 2%) at
   the cost of a larger memory footprint */
/* #define LIT_MEM */

/* ===========================================================================
 * Internal compression state.
 */

#define LENGTH_CODES 29
/* number of length codes, not counting the special END_BLOCK code */

     * The same heap array is used to build all trees.
     */

    uch depth[2*L_CODES+1];
    /* Depth of each subtree used as tie breaker for trees of equal frequency
     */

#ifdef LIT_MEM
#   define LIT_BUFS 5
    ushf *d_buf;          /* buffer for distances */
    uchf *l_buf;          /* buffer for literals/lengths */
#else
#   define LIT_BUFS 4
    uchf *sym_buf;        /* buffer for distances and literals/lengths */
#endif

    uInt  lit_bufsize;
    /* Size of match buffer for literals/lengths.  There are 4 reasons for
     * limiting lit_bufsize to 64K:
     *   - frequencies can be kept in 16 bit counters
     *   - if compression is not successful for the first block, all input
     *     data is still in the window so we can still emit a stored block even

     *     example a binary file with poorly compressible code followed by
     *     a highly compressible string table.) Smaller buffer sizes give
     *     fast adaptation but have of course the overhead of transmitting
     *     trees more frequently.
     *   - I can't count above 4
     */

    uInt sym_next;      /* running index in symbol buffer */
    uInt sym_end;       /* symbol table full when sym_next reaches this */

    ulg opt_len;        /* bit length of current block with optimal trees */
    ulg static_len;     /* bit length of current block with static trees */
    uInt matches;       /* number of string matches in current block */
    uInt insert;        /* bytes at end of window left to insert */

  extern uch ZLIB_INTERNAL _length_code[];
  extern uch ZLIB_INTERNAL _dist_code[];
#else
  extern const uch ZLIB_INTERNAL _length_code[];
  extern const uch ZLIB_INTERNAL _dist_code[];
#endif

#ifdef LIT_MEM
# define _tr_tally_lit(s, c, flush) \
  { uch cc = (c); \
    s->d_buf[s->sym_next] = 0; \
    s->l_buf[s->sym_next++] = cc; \
    s->dyn_ltree[cc].Freq++; \
    flush = (s->sym_next == s->sym_end); \
   }
# define _tr_tally_dist(s, distance, length, flush) \
  { uch len = (uch)(length); \
    ush dist = (ush)(distance); \
    s->d_buf[s->sym_next] = dist; \
    s->l_buf[s->sym_next++] = len; \
    dist--; \
    s->dyn_ltree[_length_code[len]+LITERALS+1].Freq++; \
    s->dyn_dtree[d_code(dist)].Freq++; \
    flush = (s->sym_next == s->sym_end); \
  }
#else
# define _tr_tally_lit(s, c, flush) \
  { uch cc = (c); \
    s->sym_buf[s->sym_next++] = 0; \
    s->sym_buf[s->sym_next++] = 0; \
    s->sym_buf[s->sym_next++] = cc; \
    s->dyn_ltree[cc].Freq++; \
    flush = (s->sym_next == s->sym_end); \
   }
# define _tr_tally_dist(s, distance, length, flush) \
  { uch len = (uch)(length); \
    ush dist = (ush)(distance); \
    s->sym_buf[s->sym_next++] = (uch)dist; \
    s->sym_buf[s->sym_next++] = (uch)(dist >> 8); \
    s->sym_buf[s->sym_next++] = len; \
    dist--; \
    s->dyn_ltree[_length_code[len]+LITERALS+1].Freq++; \
    s->dyn_dtree[d_code(dist)].Freq++; \
    flush = (s->sym_next == s->sym_end); \
  }
#endif
#else
# define _tr_tally_lit(s, c, flush) flush = _tr_tally(s, 0, c)
# define _tr_tally_dist(s, distance, length, flush) \
              flush = _tr_tally(s, distance, length)
#endif

#endif /* DEFLATE_H */

   - Write over the extra field, marking foo.gz as complete.

   Recovery procedure:
   - If not a replace recovery, read in the foo.add file, and provide that data
     to the appropriate recovery below.  If there is no foo.add file, provide
     a zero data length to the recovery.  In that case, the append recovery
     restores the foo.gz to the previous compressed + uncompressed data state.
     For the compress recovery, a missing foo.add file results in foo.gz being
     restored to the previous compressed-only data state.
   - Append recovery:
     - Pick up append at + step above
   - Compress recovery:
     - Pick up compress at * step above
   - Replace recovery:
     - Pick up compress at @ step above
   - Log the repair with a date stamp in foo.repairs

        value >>= k;            // drop the bits appended
        bits -= k;
        k = 8;                  // now at a byte boundary
        *++in = value;
    }
}

// Insert enough bits in the form of empty deflate blocks in front of the
// low bits bits of value, in order to bring the sequence to a byte boundary.
// Then feed that to inflate(). This does what inflatePrime() does, except that
// a negative value of bits is not supported. bits must be in 0..16. If the
// arguments are invalid, Z_STREAM_ERROR is returned. Otherwise the return
// value from inflate() is returned.
static int inflatePreface(z_stream *strm, int bits, int value) {
    // Check input.

/* gzguts.h -- zlib internal header definitions for gz* operations
 * Copyright (C) 2004-2024 Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h
 */

#ifdef _LARGEFILE64_SOURCE
#  ifndef _LARGEFILE_SOURCE
#    define _LARGEFILE_SOURCE 1
#  endif

#if defined UNDER_CE
char ZLIB_INTERNAL *gz_strwinerror(DWORD error);
#endif

/* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t
   value -- needed when comparing unsigned to z_off64_t, which is signed
   (possible z_off64_t types off_t, off64_t, and long are all signed) */



unsigned ZLIB_INTERNAL gz_intmax(void);
#define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax())

/* gzlib.c -- zlib functions common to reading and writing gzip files
 * Copyright (C) 2004-2024 Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h
 */

#include "gzguts.h"

#if defined(_WIN32) && !defined(__BORLANDC__)
#  define LSEEK _lseeki64

#else
    strcpy(state->msg, state->path);
    strcat(state->msg, ": ");
    strcat(state->msg, msg);
#endif
}


/* portably return maximum value for an int (when limits.h presumed not
   available) -- we need to do this to cover cases where 2's complement not
   used, since C standard permits 1's complement and sign-bit representations,
   otherwise we could just use ((unsigned)-1) >> 1 */
unsigned ZLIB_INTERNAL gz_intmax(void) {
#ifdef INT_MAX
    return INT_MAX;
#else
    unsigned p = 1, q;


    do {
        q = p;
        p <<= 1;
        p++;
    } while (p > q);
    return q >> 1;

#endif
}

    if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
    state = (struct inflate_state FAR *)strm->state;
    if (strm->avail_in == 0 && state->bits < 8) return Z_BUF_ERROR;

    /* if first time, start search in bit buffer */
    if (state->mode != SYNC) {
        state->mode = SYNC;
        state->hold >>= state->bits & 7;
        state->bits -= state->bits & 7;
        len = 0;
        while (state->bits >= 8) {
            buf[len++] = (unsigned char)(state->hold);
            state->hold >>= 8;
            state->bits -= 8;
        }

/* inftrees.c -- generate Huffman trees for efficient decoding
 * Copyright (C) 1995-2024 Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h
 */

#include "zutil.h"
#include "inftrees.h"

#define MAXBITS 15

const char inflate_copyright[] =
   " inflate 1.3.1 Copyright 1995-2024 Mark Adler ";
/*
  If you use the zlib library in a product, an acknowledgment is welcome
  in the documentation of your product. If for some reason you cannot
  include such an acknowledgment, I would appreciate that you keep this
  copyright string in the executable of your product.
 */

    unsigned short count[MAXBITS+1];    /* number of codes of each length */
    unsigned short offs[MAXBITS+1];     /* offsets in table for each length */
    static const unsigned short lbase[31] = { /* Length codes 257..285 base */
        3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31,
        35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258, 0, 0};
    static const unsigned short lext[31] = { /* Length codes 257..285 extra */
        16, 16, 16, 16, 16, 16, 16, 16, 17, 17, 17, 17, 18, 18, 18, 18,
        19, 19, 19, 19, 20, 20, 20, 20, 21, 21, 21, 21, 16, 203, 77};
    static const unsigned short dbase[32] = { /* Distance codes 0..29 base */
        1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193,
        257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145,
        8193, 12289, 16385, 24577, 0, 0};
    static const unsigned short dext[32] = { /* Distance codes 0..29 extra */
        16, 16, 16, 16, 17, 17, 18, 18, 19, 19, 20, 20, 21, 21, 22, 22,
        23, 23, 24, 24, 25, 25, 26, 26, 27, 27,

/* Maximum size of the dynamic table.  The maximum number of code structures is
   1444, which is the sum of 852 for literal/length codes and 592 for distance
   codes.  These values were found by exhaustive searches using the program
   examples/enough.c found in the zlib distribution.  The arguments to that
   program are the number of symbols, the initial root table size, and the
   maximum bit length of a code.  "enough 286 9 15" for literal/length codes
   returns 852, and "enough 30 6 15" for distance codes returns 592. The
   initial root table size (9 or 6) is found in the fifth argument of the
   inflate_table() calls in inflate.c and infback.c.  If the root table size is
   changed, then these maximum sizes would be need to be recalculated and
   updated. */
#define ENOUGH_LENS 852
#define ENOUGH_DISTS 592
#define ENOUGH (ENOUGH_LENS+ENOUGH_DISTS)

    ReDim bytaryCpr(lngCprSiz - 1)
    If lngfncCpr(bytaryCpr(0), lngCprSiz, bytaryOri(0), lngOriSiz, intLvl) =
SUCCESS Then
        lngpvtPcnSml = (1# - (lngCprSiz / lngOriSiz)) * 100
        ReDim Preserve bytaryCpr(lngCprSiz - 1)
        Open strCprPth For Binary Access Write As #1
            Put #1, , bytaryCpr()
            Put #1, , lngOriSiz 'Add the original size value to the end
(last 4 bytes)
        Close #1
    Else
        MsgBox "Compression error"
    End If
    Erase bytaryCpr
    Erase bytaryOri

        ZLIB version 1.3.1 for OS/400 installation instructions

1) Download and unpack the zlib tarball to some IFS directory.
   (i.e.: /path/to/the/zlib/ifs/source/directory)

   If the installed IFS command supports gzip format, this is straightforward,
else you have to unpack first to some directory on a system supporting it,
then move the whole directory to the IFS via the network (via SMB or FTP).

      *  ZLIB.INC - Interface to the general purpose compression library
      *
      *  ILE RPG400 version by Patrick Monnerat, DATASPHERE.
      *  Version 1.3.1
      *
      *
      *  WARNING:
      *     Procedures inflateInit(), inflateInit2(), deflateInit(),
      *         deflateInit2() and inflateBackInit() need to be called with
      *         two additional arguments:
      *         the package version string and the stream control structure.
      *         size. This is needed because RPG lacks some macro feature.
      *         Call these procedures as:
      *             inflateInit(...: ZLIB_VERSION: %size(z_stream))
      *
      /if not defined(ZLIB_H_)
      /define ZLIB_H_
      *
      **************************************************************************
      *                               Constants
      **************************************************************************
      *
      *  Versioning information.
      *
     D ZLIB_VERSION    C                   '1.3.1'
     D ZLIB_VERNUM     C                   X'12a0'
     D ZLIB_VER_MAJOR  C                   1
     D ZLIB_VER_MINOR  C                   3
     D ZLIB_VER_REVISION...
     D                 C                   1
     D ZLIB_VER_SUBREVISION...
     D                 C                   0
      *
      *  Other equates.
      *
     D Z_NO_FLUSH      C                   0
     D Z_PARTIAL_FLUSH...

      <QPG:EmailAddress></QPG:EmailAddress>
   </QPG:Responsible>

   <QPG:Values>
      <QPG:Files>
         <QPG:Add file="../zconf.h" install="/opt/include/" user="root:sys" permission="644"/>
         <QPG:Add file="../zlib.h" install="/opt/include/" user="root:sys" permission="644"/>
         <QPG:Add file="../libz.so.1.3.1" install="/opt/lib/" user="root:bin" permission="644"/>
         <QPG:Add file="libz.so" install="/opt/lib/" component="dev" filetype="symlink" linkto="libz.so.1.3.1"/>
         <QPG:Add file="libz.so.1" install="/opt/lib/" filetype="symlink" linkto="libz.so.1.3.1"/>
         <QPG:Add file="../libz.so.1.3.1" install="/opt/lib/" component="slib"/>
      </QPG:Files>

      <QPG:PackageFilter>
         <QPM:PackageManifest>
            <QPM:PackageDescription>
               <QPM:PackageType>Library</QPM:PackageType>
               <QPM:PackageReleaseNotes></QPM:PackageReleaseNotes>

               <QPM:ProductDescriptionShort>A massively spiffy yet delicately unobtrusive compression library.</QPM:ProductDescriptionShort>
               <QPM:ProductDescriptionLong>zlib is designed to be a free, general-purpose, legally unencumbered, lossless data compression library for use on virtually any computer hardware and operating system.</QPM:ProductDescriptionLong>
               <QPM:ProductDescriptionURL>http://www.gzip.org/zlib</QPM:ProductDescriptionURL>
               <QPM:ProductDescriptionEmbedURL></QPM:ProductDescriptionEmbedURL>
            </QPM:ProductDescription>

            <QPM:ReleaseDescription>
               <QPM:ReleaseVersion>1.3.1</QPM:ReleaseVersion>
               <QPM:ReleaseUrgency>Medium</QPM:ReleaseUrgency>
               <QPM:ReleaseStability>Stable</QPM:ReleaseStability>
               <QPM:ReleaseNoteMinor></QPM:ReleaseNoteMinor>
               <QPM:ReleaseNoteMajor></QPM:ReleaseNoteMajor>
               <QPM:ExcludeCountries>
                  <QPM:Country></QPM:Country>
               </QPM:ExcludeCountries>

 */

static const char dictionary[] = "hello";
static uLong dictId;    /* Adler32 value of the dictionary */

#ifdef Z_SOLO

static void *myalloc(void *q, unsigned n, unsigned m) {
    (void)q;
    return calloc(n, m);
}

static void myfree(void *q, void *p) {
    (void)q;
    free(p);
}

static alloc_func zalloc = myalloc;
static free_func zfree = myfree;

#else /* !Z_SOLO */

static alloc_func zalloc = (alloc_func)0;
static free_func zfree = (free_func)0;

/* ===========================================================================
 * Test compress() and uncompress()
 */
static void test_compress(Byte *compr, uLong comprLen, Byte *uncompr,
                   uLong uncomprLen) {
    int err;
    uLong len = (uLong)strlen(hello)+1;

    err = compress(compr, &comprLen, (const Bytef*)hello, len);
    CHECK_ERR(err, "compress");

        printf("uncompress(): %s\n", (char *)uncompr);
    }
}

/* ===========================================================================
 * Test read/write of .gz files
 */
static void test_gzio(const char *fname, Byte *uncompr, uLong uncomprLen) {
#ifdef NO_GZCOMPRESS
    fprintf(stderr, "NO_GZCOMPRESS -- gz* functions cannot compress\n");
#else
    int err;
    int len = (int)strlen(hello)+1;
    gzFile file;
    z_off_t pos;

}

#endif /* Z_SOLO */

/* ===========================================================================
 * Test deflate() with small buffers
 */
static void test_deflate(Byte *compr, uLong comprLen) {
    z_stream c_stream; /* compression stream */
    int err;
    uLong len = (uLong)strlen(hello)+1;

    c_stream.zalloc = zalloc;
    c_stream.zfree = zfree;
    c_stream.opaque = (voidpf)0;

    err = deflateEnd(&c_stream);
    CHECK_ERR(err, "deflateEnd");
}

/* ===========================================================================
 * Test inflate() with small buffers
 */
static void test_inflate(Byte *compr, uLong comprLen, Byte *uncompr,
                  uLong uncomprLen) {
    int err;
    z_stream d_stream; /* decompression stream */

    strcpy((char*)uncompr, "garbage");

    d_stream.zalloc = zalloc;

        printf("inflate(): %s\n", (char *)uncompr);
    }
}

/* ===========================================================================
 * Test deflate() with large buffers and dynamic change of compression level
 */
static void test_large_deflate(Byte *compr, uLong comprLen, Byte *uncompr,
                        uLong uncomprLen) {
    z_stream c_stream; /* compression stream */
    int err;

    c_stream.zalloc = zalloc;
    c_stream.zfree = zfree;
    c_stream.opaque = (voidpf)0;

    err = deflateEnd(&c_stream);
    CHECK_ERR(err, "deflateEnd");
}

/* ===========================================================================
 * Test inflate() with large buffers
 */
static void test_large_inflate(Byte *compr, uLong comprLen, Byte *uncompr,
                        uLong uncomprLen) {
    int err;
    z_stream d_stream; /* decompression stream */

    strcpy((char*)uncompr, "garbage");

    d_stream.zalloc = zalloc;

        printf("large_inflate(): OK\n");
    }
}

/* ===========================================================================
 * Test deflate() with full flush
 */
static void test_flush(Byte *compr, uLong *comprLen) {
    z_stream c_stream; /* compression stream */
    int err;
    uInt len = (uInt)strlen(hello)+1;

    c_stream.zalloc = zalloc;
    c_stream.zfree = zfree;
    c_stream.opaque = (voidpf)0;

    *comprLen = c_stream.total_out;
}

/* ===========================================================================
 * Test inflateSync()
 */
static void test_sync(Byte *compr, uLong comprLen, Byte *uncompr,
                      uLong uncomprLen) {
    int err;
    z_stream d_stream; /* decompression stream */

    strcpy((char*)uncompr, "garbage");

    d_stream.zalloc = zalloc;
    d_stream.zfree = zfree;

    printf("after inflateSync(): hel%s\n", (char *)uncompr);
}

/* ===========================================================================
 * Test deflate() with preset dictionary
 */
static void test_dict_deflate(Byte *compr, uLong comprLen) {
    z_stream c_stream; /* compression stream */
    int err;

    c_stream.zalloc = zalloc;
    c_stream.zfree = zfree;
    c_stream.opaque = (voidpf)0;

    err = deflateEnd(&c_stream);
    CHECK_ERR(err, "deflateEnd");
}

/* ===========================================================================
 * Test inflate() with a preset dictionary
 */
static void test_dict_inflate(Byte *compr, uLong comprLen, Byte *uncompr,
                       uLong uncomprLen) {
    int err;
    z_stream d_stream; /* decompression stream */

    strcpy((char*)uncompr, "garbage");

    d_stream.zalloc = zalloc;

#ifdef Z_SOLO
/* for Z_SOLO, create simplified gz* functions using deflate and inflate */

#if defined(Z_HAVE_UNISTD_H) || defined(Z_LARGE)
#  include <unistd.h>       /* for unlink() */
#endif

static void *myalloc(void *q, unsigned n, unsigned m) {
    (void)q;
    return calloc(n, m);
}

static void myfree(void *q, void *p) {
    (void)q;
    free(p);
}

typedef struct gzFile_s {
    FILE *file;
    int write;
    int err;
    char *msg;
    z_stream strm;
} *gzFile;

static gzFile gz_open(const char *path, int fd, const char *mode) {
    gzFile gz;
    int ret;

    gz = malloc(sizeof(struct gzFile_s));
    if (gz == NULL)
        return NULL;
    gz->write = strchr(mode, 'w') != NULL;

        return NULL;
    }
    gz->err = 0;
    gz->msg = "";
    return gz;
}

static gzFile gzopen(const char *path, const char *mode) {
    return gz_open(path, -1, mode);
}

static gzFile gzdopen(int fd, const char *mode) {
    return gz_open(NULL, fd, mode);
}

static int gzwrite(gzFile gz, const void *buf, unsigned len) {
    z_stream *strm;
    unsigned char out[BUFLEN];

    if (gz == NULL || !gz->write)
        return 0;
    strm = &(gz->strm);
    strm->next_in = (void *)buf;
    strm->avail_in = len;
    do {
        strm->next_out = out;
        strm->avail_out = BUFLEN;
        (void)deflate(strm, Z_NO_FLUSH);
        fwrite(out, 1, BUFLEN - strm->avail_out, gz->file);
    } while (strm->avail_out == 0);
    return len;
}

static int gzread(gzFile gz, void *buf, unsigned len) {
    int ret;
    unsigned got;
    unsigned char in[1];
    z_stream *strm;

    if (gz == NULL || gz->write)
        return 0;

        }
        if (ret == Z_STREAM_END)
            inflateReset(strm);
    } while (strm->avail_out);
    return len - strm->avail_out;
}

static int gzclose(gzFile gz) {
    z_stream *strm;
    unsigned char out[BUFLEN];

    if (gz == NULL)
        return Z_STREAM_ERROR;
    strm = &(gz->strm);
    if (gz->write) {

    else
        inflateEnd(strm);
    fclose(gz->file);
    free(gz);
    return Z_OK;
}

static const char *gzerror(gzFile gz, int *err) {
    *err = gz->err;
    return gz->msg;
}

#endif

static char *prog;

/* ===========================================================================
 * Display error message and exit
 */
static void error(const char *msg) {
    fprintf(stderr, "%s: %s\n", prog, msg);
    exit(1);
}

#ifdef USE_MMAP /* MMAP version, Miguel Albrecht <malbrech@eso.org> */

/* Try compressing the input file at once using mmap. Return Z_OK if
 * success, Z_ERRNO otherwise.
 */
static int gz_compress_mmap(FILE *in, gzFile out) {
    int len;
    int err;
    int ifd = fileno(in);
    caddr_t buf;    /* mmap'ed buffer for the entire input file */
    off_t buf_len;  /* length of the input file */
    struct stat sb;

}
#endif /* USE_MMAP */

/* ===========================================================================
 * Compress input to output then close both files.
 */

static void gz_compress(FILE *in, gzFile out) {
    local char buf[BUFLEN];
    int len;
    int err;

#ifdef USE_MMAP
    /* Try first compressing with mmap. If mmap fails (minigzip used in a
     * pipe), use the normal fread loop.

    fclose(in);
    if (gzclose(out) != Z_OK) error("failed gzclose");
}

/* ===========================================================================
 * Uncompress input to output then close both files.
 */
static void gz_uncompress(gzFile in, FILE *out) {
    local char buf[BUFLEN];
    int len;
    int err;

    for (;;) {
        len = gzread(in, buf, sizeof(buf));
        if (len < 0) error (gzerror(in, &err));

}


/* ===========================================================================
 * Compress the given file: create a corresponding .gz file and remove the
 * original.
 */
static void file_compress(char *file, char *mode) {
    local char outfile[MAX_NAME_LEN];
    FILE  *in;
    gzFile out;

    if (strlen(file) + strlen(GZ_SUFFIX) >= sizeof(outfile)) {
        fprintf(stderr, "%s: filename too long\n", prog);
        exit(1);

    unlink(file);
}


/* ===========================================================================
 * Uncompress the given file and remove the original.
 */
static void file_uncompress(char *file) {
    local char buf[MAX_NAME_LEN];
    char *infile, *outfile;
    FILE  *out;
    gzFile in;
    z_size_t len = strlen(file);

    if (len + strlen(GZ_SUFFIX) >= sizeof(buf)) {

<?xml version="1.0" ?>
<package name="zlib" version="1.3.1">
    <library name="zlib" dlversion="1.3.1" dlname="z">
	<property name="description"> zip compression library </property>
	<property name="include-target-dir" value="$(@PACKAGE/install-includedir)" />

	<!-- fixme: not implemented yet -->
	<property name="compiler/c/inline" value="yes" />

	<include-file name="zlib.h" scope="public" mode="644" />

/* trees.c -- output deflated data using Huffman coding
 * Copyright (C) 1995-2024 Jean-loup Gailly
 * detect_data_type() function provided freely by Cosmin Truta, 2006
 * For conditions of distribution and use, see copyright notice in zlib.h
 */

/*
 *  ALGORITHM
 *

/* ===========================================================================
 * Send the block data compressed using the given Huffman trees
 */
local void compress_block(deflate_state *s, const ct_data *ltree,
                          const ct_data *dtree) {
    unsigned dist;      /* distance of matched string */
    int lc;             /* match length or unmatched char (if dist == 0) */
    unsigned sx = 0;    /* running index in symbol buffers */
    unsigned code;      /* the code to send */
    int extra;          /* number of extra bits to send */

    if (s->sym_next != 0) do {
#ifdef LIT_MEM
        dist = s->d_buf[sx];
        lc = s->l_buf[sx++];
#else
        dist = s->sym_buf[sx++] & 0xff;
        dist += (unsigned)(s->sym_buf[sx++] & 0xff) << 8;
        lc = s->sym_buf[sx++];
#endif
        if (dist == 0) {
            send_code(s, lc, ltree); /* send a literal byte */
            Tracecv(isgraph(lc), (stderr," '%c' ", lc));
        } else {
            /* Here, lc is the match length - MIN_MATCH */
            code = _length_code[lc];
            send_code(s, code + LITERALS + 1, ltree);   /* send length code */

            extra = extra_dbits[code];
            if (extra != 0) {
                dist -= (unsigned)base_dist[code];
                send_bits(s, dist, extra);   /* send the extra distance bits */
            }
        } /* literal or match pair ? */

        /* Check for no overlay of pending_buf on needed symbols */
#ifdef LIT_MEM
        Assert(s->pending < 2 * (s->lit_bufsize + sx), "pendingBuf overflow");
#else
        Assert(s->pending < s->lit_bufsize + sx, "pendingBuf overflow");
#endif

    } while (sx < s->sym_next);

    send_code(s, END_BLOCK, ltree);
}

/* ===========================================================================

}

/* ===========================================================================
 * Save the match info and tally the frequency counts. Return true if
 * the current block must be flushed.
 */
int ZLIB_INTERNAL _tr_tally(deflate_state *s, unsigned dist, unsigned lc) {
#ifdef LIT_MEM
    s->d_buf[s->sym_next] = (ush)dist;
    s->l_buf[s->sym_next++] = (uch)lc;
#else
    s->sym_buf[s->sym_next++] = (uch)dist;
    s->sym_buf[s->sym_next++] = (uch)(dist >> 8);
    s->sym_buf[s->sym_next++] = (uch)lc;
#endif
    if (dist == 0) {
        /* lc is the unmatched char */
        s->dyn_ltree[lc].Freq++;
    } else {
        s->matches++;
        /* Here, lc is the match length - MIN_MATCH */
        dist--;             /* dist = match distance - 1 */

            Frequently Asked Questions about ZLIB1.DLL


This document describes the design, the rationale, and the usage
of the common DLL build of zlib, named ZLIB1.DLL.  If you have
general questions about zlib, you should see the file "FAQ" found
in the zlib distribution, or at the following location:
  http://www.gzip.org/zlib/zlib_faq.html


 1. What is ZLIB1.DLL, and how can I get it?

  - ZLIB1.DLL is the common build of zlib as a DLL.
    (Please remark the character '1' in the name.)





    Applications that link to ZLIB1.DLL can rely on the following
    specification:

    * The exported symbols are exclusively defined in the source
      files "zlib.h" and "zlib.def", found in an official zlib
      source distribution.
    * The symbols are exported by name, not by ordinal.

    macros like NO_GZCOMPRESS or NO_GZIP at compile time?

  - No.  A legitimate build of ZLIB1.DLL must provide the complete
    zlib functionality, as implemented in the official zlib source
    code.  But you can make your own private DLL build, under a
    different file name, as suggested in the previous answer.













**

This document is written and maintained by
Cosmin Truta <cosmint@cs.ubbcluj.ro>

ZLIB DATA COMPRESSION LIBRARY

zlib 1.3.1 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
http://www.ietf.org/rfc/rfc1950.txt (zlib format), rfc1951.txt (deflate format)
and rfc1952.txt (gzip format).

All functions of the compression library are documented in the file zlib.h
(volunteer to write man pages welcome, contact zlib@gzip.org).  Two compiled
examples are distributed in this package, example and minigzip.  The example_d
and minigzip_d flavors validate that the zlib1.dll file is working correctly.

Questions about zlib should be sent to <zlib@gzip.org>.  The zlib home page
is http://zlib.net/ .  Before reporting a problem, please check this site to
verify that you have the latest version of zlib; otherwise get the latest
version and check whether the problem still exists or not.

PLEASE read DLL_FAQ.txt, and the zlib FAQ http://zlib.net/zlib_faq.html before
asking for help.


Manifest:

The package zlib-1.3.1-win32-x86.zip will contain the following files:

  README-WIN32.txt This document
  ChangeLog        Changes since previous zlib packages
  DLL_FAQ.txt      Frequently asked questions about zlib1.dll
  zlib.3.pdf       Documentation of this library in Adobe Acrobat format

  example.exe      A statically-bound example (using zlib.lib, not the dll)

/* zconf.h -- configuration of the zlib compression library
 * Copyright (C) 1995-2024 Jean-loup Gailly, Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h
 */

/* @(#) $Id$ */

#ifndef ZCONF_H
#define ZCONF_H

#  ifdef STDC
#    define OF(args)  args
#  else
#    define OF(args)  ()
#  endif
#endif









/* The following definitions for FAR are needed only for MSDOS mixed
 * model programming (small or medium model with some far allocations).
 * This was tested only with MSC; for other MSDOS compilers you may have
 * to define NO_MEMCPY in zutil.h.  If you don't need the mixed model,
 * just define FAR to be empty.
 */
#ifdef SYS16BIT

/* zconf.h -- configuration of the zlib compression library
 * Copyright (C) 1995-2024 Jean-loup Gailly, Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h
 */

/* @(#) $Id$ */

#ifndef ZCONF_H
#define ZCONF_H

#  ifdef STDC
#    define OF(args)  args
#  else
#    define OF(args)  ()
#  endif
#endif









/* The following definitions for FAR are needed only for MSDOS mixed
 * model programming (small or medium model with some far allocations).
 * This was tested only with MSC; for other MSDOS compilers you may have
 * to define NO_MEMCPY in zutil.h.  If you don't need the mixed model,
 * just define FAR to be empty.
 */
#ifdef SYS16BIT

/* zconf.h -- configuration of the zlib compression library
 * Copyright (C) 1995-2024 Jean-loup Gailly, Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h
 */

/* @(#) $Id$ */

#ifndef ZCONF_H
#define ZCONF_H

#  ifdef STDC
#    define OF(args)  args
#  else
#    define OF(args)  ()
#  endif
#endif









/* The following definitions for FAR are needed only for MSDOS mixed
 * model programming (small or medium model with some far allocations).
 * This was tested only with MSC; for other MSDOS compilers you may have
 * to define NO_MEMCPY in zutil.h.  If you don't need the mixed model,
 * just define FAR to be empty.
 */
#ifdef SYS16BIT

.TH ZLIB 3 "22 Jan 2024"
.SH NAME
zlib \- compression/decompression library
.SH SYNOPSIS
[see
.I zlib.h
for full description]
.SH DESCRIPTION

.IP
http://zlib.net/zlib_faq.html
.LP
before asking for help.
Send questions and/or comments to zlib@gzip.org,
or (for the Windows DLL version) to Gilles Vollant (info@winimage.com).
.SH AUTHORS AND LICENSE
Version 1.3.1
.LP
Copyright (C) 1995-2024 Jean-loup Gailly and Mark Adler
.LP
This software is provided 'as-is', without any express or implied
warranty.  In no event will the authors be held liable for any damages
arising from the use of this software.
.LP
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it

/* zlib.h -- interface of the 'zlib' general purpose compression library
  version 1.3.1, January 22nd, 2024

  Copyright (C) 1995-2024 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
  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

#include "zconf.h"

#ifdef __cplusplus
extern "C" {
#endif

#define ZLIB_VERSION "1.3.1"
#define ZLIB_VERNUM 0x1310
#define ZLIB_VER_MAJOR 1
#define ZLIB_VER_MINOR 3
#define ZLIB_VER_REVISION 1
#define ZLIB_VER_SUBREVISION 0

/*
    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

     inflateSync searches for a 00 00 FF FF pattern in the compressed data.
   All full flush points have this pattern, but not all occurrences of this
   pattern are full flush points.

     inflateSync returns Z_OK if a possible full flush point has been found,
   Z_BUF_ERROR if no more input was provided, Z_DATA_ERROR if no flush point
   has been found, or Z_STREAM_ERROR if the stream structure was inconsistent.
   In the success case, the application may save the current value of total_in
   which indicates where valid compressed data was found.  In the error case,
   the application may repeatedly call inflateSync, providing more input each
   time, until success or end of the input data.
*/

ZEXTERN int ZEXPORT inflateCopy(z_streamp dest,
                                z_streamp source);
/*
     Sets the destination stream as a complete copy of the source stream.

/*
ZEXTERN uLong ZEXPORT crc32_combine(uLong crc1, uLong crc2, z_off_t len2);

     Combine two CRC-32 check values into one.  For two sequences of bytes,
   seq1 and seq2 with lengths len1 and len2, CRC-32 check values were
   calculated for each, crc1 and crc2.  crc32_combine() returns the CRC-32
   check value of seq1 and seq2 concatenated, requiring only crc1, crc2, and
   len2. len2 must be non-negative.
*/

/*
ZEXTERN uLong ZEXPORT crc32_combine_gen(z_off_t len2);

     Return the operator corresponding to length len2, to be used with
   crc32_combine_op(). len2 must be non-negative.
*/

ZEXTERN uLong ZEXPORT crc32_combine_op(uLong crc1, uLong crc2, uLong op);
/*
     Give the same result as crc32_combine(), using op in place of len2. op is
   is generated from len2 by crc32_combine_gen(). This will be faster than
   crc32_combine() if the generated op is used more than once.

/* zutil.h -- internal interface and configuration of the compression library
 * Copyright (C) 1995-2024 Jean-loup Gailly, Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h
 */

/* WARNING: this file should *not* be used by applications. It is
   part of the implementation of the compression library and is
   subject to change. Applications should only use zlib.h.
 */

#    define Z_U8 unsigned
#  endif
#endif

extern z_const char * const z_errmsg[10]; /* indexed by 2-zlib_error */
/* (size given to avoid silly warnings with Visual C++) */

#define ERR_MSG(err) z_errmsg[(err) < -6 || (err) > 2 ? 9 : 2 - (err)]

#define ERR_RETURN(strm,err) \
  return (strm->msg = ERR_MSG(err), (err))
/* To be used only when the state is known to be valid */

        /* common constants */

#ifdef OS2
#  define OS_CODE  6
#  if defined(M_I86) && !defined(Z_SOLO)
#    include <malloc.h>
#  endif
#endif

#if defined(MACOS)
#  define OS_CODE  7









#endif

#ifdef __acorn
#  define OS_CODE 13
#endif

#if defined(WIN32) && !defined(__CYGWIN__)

#  define OS_CODE 18
#endif

#ifdef __APPLE__
#  define OS_CODE 19
#endif













#if defined(__BORLANDC__) && !defined(MSDOS)
  #pragma warn -8004
  #pragma warn -8008
  #pragma warn -8066
#endif

/* provide prototypes for these when building zlib without LFS */