/* zip.c -- IO on .zip files using zlib
   part of the MiniZip project - ( https://www.winimage.com/zLibDll/minizip.html )

         Copyright (C) 1998-2026 Gilles Vollant (minizip) ( https://www.winimage.com/zLibDll/minizip.html )

         Modifications for Zip64 support
         Copyright (C) 2009-2010 Mathias Svensson ( https://result42.com )

         For more info read MiniZip_info.txt

         Changes
   Oct-2009 - Mathias Svensson - Remove old C style function prototypes
   Oct-2009 - Mathias Svensson - Added Zip64 Support when creating new file archives
   Oct-2009 - Mathias Svensson - Did some code cleanup and refactoring to get better overview of some functions.
   Oct-2009 - Mathias Svensson - Added zipRemoveExtraInfoBlock to strip extra field data from its ZIP64 data
                                 It is used when recreating zip archive with RAW when deleting items from a zip.
                                 ZIP64 data is automatically added to items that needs it, and existing ZIP64 data need to be removed.
   Oct-2009 - Mathias Svensson - Added support for BZIP2 as compression mode (bzip2 lib is required)
   Jan-2010 - back to unzip and minizip 1.0 name scheme, with compatibility layer

*/


#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#ifndef ZLIB_CONST
#  define ZLIB_CONST
#endif
#ifdef ZLIB_DLL
#  undef ZLIB_DLL
#endif
#include "zlib.h"
#include "zip.h"

#ifdef STDC
#  include <stddef.h>
#endif
#ifdef NO_ERRNO_H
    extern int errno;
#else
#   include <errno.h>
#endif


#ifndef local
#  define local static
#endif
/* compile with -Dlocal if your debugger can't find static symbols */

#ifndef VERSIONMADEBY
# define VERSIONMADEBY   (0x0) /* platform dependent */
#endif

#ifndef Z_BUFSIZE
#define Z_BUFSIZE (64*1024) /* (16384) */
#endif

#ifndef Z_MAXFILENAMEINZIP
#define Z_MAXFILENAMEINZIP (256)
#endif

#ifndef ALLOC
# define ALLOC(size) (malloc(size))
#endif

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

/* I've found an old Unix (a SunOS 4.1.3_U1) without all SEEK_* defined.... */


/* NOT sure that this work on ALL platform */
#define MAKEULONG64(a, b) ((ZPOS64_T)(((unsigned long)(a)) | ((ZPOS64_T)((unsigned long)(b))) << 32))

#ifndef SEEK_CUR
#define SEEK_CUR    1
#endif

#ifndef SEEK_END
#define SEEK_END    2
#endif

#ifndef SEEK_SET
#define SEEK_SET    0
#endif

#ifndef DEF_MEM_LEVEL
#if MAX_MEM_LEVEL >= 8
#  define DEF_MEM_LEVEL 8
#else
#  define DEF_MEM_LEVEL  MAX_MEM_LEVEL
#endif
#endif
const char zip_copyright[] =" zip 1.01 Copyright 1998-2004 Gilles Vollant - https://www.winimage.com/zLibDll/minizip.html";


#define SIZEDATA_INDATABLOCK (4096-(4*4))

#define LOCALHEADERMAGIC    (0x04034b50)
#define CENTRALHEADERMAGIC  (0x02014b50)
#define ENDHEADERMAGIC      (0x06054b50)
#define ZIP64ENDHEADERMAGIC      (0x6064b50)
#define ZIP64ENDLOCHEADERMAGIC   (0x7064b50)

#define FLAG_LOCALHEADER_OFFSET (0x06)
#define CRC_LOCALHEADER_OFFSET  (0x0e)

#define SIZECENTRALHEADER (0x2e) /* 46 */

typedef struct linkedlist_datablock_internal_s
{
  struct linkedlist_datablock_internal_s* next_datablock;
  uLong  avail_in_this_block;
  uLong  filled_in_this_block;
  uLong  unused; /* for future use and alignment */
  unsigned char data[SIZEDATA_INDATABLOCK];
} linkedlist_datablock_internal;

typedef struct linkedlist_data_s
{
    linkedlist_datablock_internal* first_block;
    linkedlist_datablock_internal* last_block;
} linkedlist_data;


/* zipAlreadyThere() set functions for a set of zero-terminated strings, and
// a block_t type for reading the central directory datablocks. */
typedef char *set_key_t;
#define set_cmp(a, b) strcmp(a, b)
#define set_drop(s, k) set_free(s, k)
#include "skipset.h"
typedef struct {
    unsigned char *next;        /* next byte in datablock data */
    size_t left;                /* number of bytes left in data (at least) */
    linkedlist_datablock_internal *node;    /* current datablock */
} block_t;


typedef struct
{
    z_stream stream;            /* zLib stream structure for inflate */
#ifdef HAVE_BZIP2
    bz_stream bstream;          /* bzLib stream structure for bziped */
#endif

    int  stream_initialised;    /* 1 is stream is initialised */
    uInt pos_in_buffered_data;  /* last written byte in buffered_data */

    ZPOS64_T pos_local_header;     /* offset of the local header of the file
                                     currently writing */
    char* central_header;       /* central header data for the current file */
    uLong size_centralExtra;
    uLong size_centralheader;   /* size of the central header for cur file */
    uLong size_centralExtraFree; /* Extra bytes allocated to the centralheader but that are not used */
    uLong flag;                 /* flag of the file currently writing */

    int  method;                /* compression method of file currently wr.*/
    int  raw;                   /* 1 for directly writing raw data */
    Byte buffered_data[Z_BUFSIZE];/* buffer contain compressed data to be writ*/
    uLong dosDate;
    uLong crc32;
    int  encrypt;
    int  zip64;               /* Add ZIP64 extended information in the extra field */
    ZPOS64_T pos_zip64extrainfo;
    ZPOS64_T totalCompressedData;
    ZPOS64_T totalUncompressedData;
#ifndef NOCRYPT
    unsigned long keys[3];     /* keys defining the pseudo-random sequence */
    const z_crc_t* pcrc_32_tab;
    unsigned crypt_header_size;
#endif
} curfile64_info;

typedef struct
{
    zlib_filefunc64_32_def z_filefunc;
    voidpf filestream;        /* io structure of the zipfile */
    linkedlist_data central_dir;/* datablock with central dir in construction*/
    int  in_opened_file_inzip;  /* 1 if a file in the zip is currently writ.*/
    curfile64_info ci;            /* info on the file currently writing */

    ZPOS64_T begin_pos;            /* position of the beginning of the zipfile */
    ZPOS64_T add_position_when_writing_offset;
    ZPOS64_T number_entry;

#ifndef NO_ADDFILEINEXISTINGZIP
    char *globalcomment;
#endif

    /* Support for zipAlreadyThere(). */
    set_t set;              /* set for detecting name collisions */
    block_t block;          /* block for reading the central directory */

} zip64_internal;


#ifndef NOCRYPT
#define INCLUDECRYPTINGCODE_IFCRYPTALLOWED
#include "crypt.h"
#endif

local linkedlist_datablock_internal* allocate_new_datablock(void) {
    linkedlist_datablock_internal* ldi;
    ldi = (linkedlist_datablock_internal*)
                 ALLOC(sizeof(linkedlist_datablock_internal));
    if (ldi!=NULL)
    {
        ldi->next_datablock = NULL ;
        ldi->filled_in_this_block = 0 ;
        ldi->avail_in_this_block = SIZEDATA_INDATABLOCK ;
    }
    return ldi;
}

local void free_datablock(linkedlist_datablock_internal* ldi) {
    while (ldi!=NULL)
    {
        linkedlist_datablock_internal* ldinext = ldi->next_datablock;
        free(ldi);
        ldi = ldinext;
    }
}

local void init_linkedlist(linkedlist_data* ll) {
    ll->first_block = ll->last_block = NULL;
}

local void free_linkedlist(linkedlist_data* ll) {
    free_datablock(ll->first_block);
    ll->first_block = ll->last_block = NULL;
}


local int add_data_in_datablock(linkedlist_data* ll, const void* buf, uLong len) {
    linkedlist_datablock_internal* ldi;
    const unsigned char* from_copy;

    if (ll==NULL)
        return ZIP_INTERNALERROR;

    if (ll->last_block == NULL)
    {
        ll->first_block = ll->last_block = allocate_new_datablock();
        if (ll->first_block == NULL)
            return ZIP_INTERNALERROR;
    }

    ldi = ll->last_block;
    from_copy = (const unsigned char*)buf;

    while (len>0)
    {
        uInt copy_this;
        uInt i;
        unsigned char* to_copy;

        if (ldi->avail_in_this_block==0)
        {
            ldi->next_datablock = allocate_new_datablock();
            if (ldi->next_datablock == NULL)
                return ZIP_INTERNALERROR;
            ldi = ldi->next_datablock ;
            ll->last_block = ldi;
        }

        if (ldi->avail_in_this_block < len)
            copy_this = (uInt)ldi->avail_in_this_block;
        else
            copy_this = (uInt)len;

        to_copy = &(ldi->data[ldi->filled_in_this_block]);

        for (i=0;i<copy_this;i++)
            *(to_copy+i)=*(from_copy+i);

        ldi->filled_in_this_block += copy_this;
        ldi->avail_in_this_block -= copy_this;
        from_copy += copy_this ;
        len -= copy_this;
    }
    return ZIP_OK;
}

/* zipAlreadyThere() operations. "set" in the zip internal structure keeps the
// set of names that are in the under-construction central directory so far. A
// skipset provides ~O(log n) time insertion and searching. Central directory
// records, stored in a linked list of allocated memory datablocks, is read
// through "block" in the zip internal structure.

// The block_*() functions support extracting the central directory file names
// from the datablocks. They are designed to support a growing directory by
// automatically continuing once more data has been appended to the linked
// datablocks.

// Initialize *block to the head of list. This should only be called once the
// list has at least some data in it, i.e. list->first_block is not NULL. */
local void block_init(block_t *block, linkedlist_data *list) {
    block->node = list->first_block;
    block->next = block->node->data;
    block->left = block->node->filled_in_this_block;
}

/* Mark *block as bad, with all subsequent reads returning end, even if more
// data is added to the datablocks. This is invoked if the central directory is
// invalid, so there is no longer any point in attempting to interpret it. */
local void block_stop(block_t *block) {
    block->left = 0;
    block->next = NULL;
}

/* Return true if *block has reached the end of the data in the datablocks. */
local int block_end(block_t *block) {
    linkedlist_datablock_internal *node = block->node;
    if (node == NULL)
        /* This block was previously terminated with extreme prejudice. */
        return 1;
    if (block->next < node->data + node->filled_in_this_block)
        /* There are more bytes to read in the current datablock. */
        return 0;
    while (node->next_datablock != NULL) {
        if (node->filled_in_this_block != 0)
            /* There are some bytes in a later datablock. */
            return 0;
        node = node->next_datablock;
    }
    /* Reached the end of the list of datablocks. There's nothing. */
    return 1;
}

/* Return one byte from *block, or -1 if the end is reached. */
local int block_get(block_t *block) {
    while (block->left == 0) {
        if (block->node == NULL)
            /* We've been marked bad. Return end. */
            return -1;
        /* Update left in case more was filled in since we were last here. */
        block->left = block->node->filled_in_this_block -
                      (size_t)(block->next - block->node->data);
        if (block->left != 0)
            /* There was indeed more data appended in the current datablock. */
            break;
        if (block->node->next_datablock == NULL)
            /* No more data here, and there is no next datablock. At the end. */
            return -1;
        /* Try the next datablock for more data. */
        block->node = block->node->next_datablock;
        block->next = block->node->data;
        block->left = block->node->filled_in_this_block;
    }
    /* We have a byte to return. */
    block->left--;
    return *block->next++;
}

/* Return a 16-bit unsigned little-endian value from block, or a negative value
// if the end is reached. */
local long block_get2(block_t *block) {
    int low = block_get(block);
    int high = block_get(block);
    return low < 0 || high < 0 ? -1 : low | ((long)high << 8);
}

/* Read up to len bytes from block into buf. Return the number of bytes read. */
local size_t block_read(block_t *block, unsigned char *buf, size_t len) {
    size_t need = len;
    while (need) {
        if (block->left == 0) {
            /* Get a byte to update and step through the linked list as needed. */
            int got = block_get(block);
            if (got == -1)
                /* Reached the end. */
                break;
            *buf++ = (unsigned char)got;
            need--;
            continue;
        }
        size_t take = need > block->left ? block->left : need;
        memcpy(buf, block->next, take);
        block->next += take;
        block->left -= take;
        buf += take;
        need -= take;
    }
    return len - need;      /* return the number of bytes copied */
}

/* Skip n bytes in block. Return 0 on success or -1 if there are less than n
// bytes to the end. */
local int block_skip(block_t *block, size_t n) {
    while (n > block->left) {
        n -= block->left;
        block->next += block->left;
        block->left = 0;
        if (block_get(block) == -1)
            return -1;
        n--;
    }
    block->next += n;
    block->left -= n;
    return 0;
}

/* Process the next central directory record at *block. Return the allocated,
// zero-terminated file name, or NULL for end of input or invalid data. If
// invalid, *block is marked bad. This uses *set for the allocation of memory. */
local char *block_central_name(block_t *block, set_t *set) {
    char *name = NULL;
    for (;;) {
        if (block_end(block))
            /* At the end of the central directory (so far). */
            return NULL;

        /* Check for a central directory record signature. */
        if (block_get2(block) != (CENTRALHEADERMAGIC & 0xffff) ||
            block_get2(block) != (CENTRALHEADERMAGIC >> 16))
            /* Incorrect signature. */
            break;

        /* Go through the remaining fixed-length portion of the record,
        // extracting the lengths of the three variable-length fields. */
        block_skip(block, 24);
        unsigned flen = (unsigned)block_get2(block);    /* file name length */
        unsigned xlen = (unsigned)block_get2(block);    /* extra length */
        unsigned clen = (unsigned)block_get2(block);    /* comment length */
        if (block_skip(block, 12) == -1)
            /* Premature end of the record. */
            break;

        /* Extract the name and skip over the extra and comment fields. */
        name = set_alloc(set, NULL, flen + 1);
        if (block_read(block, (unsigned char *)name, flen) < flen ||
            block_skip(block, xlen + clen) == -1)
            /* Premature end of the record. */
            break;

        /* Check for embedded nuls in the name. */
        if (memchr(name, 0, flen) != NULL) {
            /* This name can never match the zero-terminated name provided to
            // zipAlreadyThere(), so we discard it and go back to get another
            // name. (Who the heck is putting nuls inside their zip file entry
            // names anyway?) */
            set_free(set, name);
            continue;
        }

        /* All good. Return the zero-terminated file name. */
        name[flen] = 0;
        return name;
    }

    /* Invalid signature or premature end of the central directory record.
    // Abandon trying to process the central directory. */
    set_free(set, name);
    block_stop(block);
    return NULL;
}

/* Return 0 if name is not in the central directory so far, 1 if it is, -1 if
// the central directory is invalid, -2 if out of memory, or ZIP_PARAMERROR if
// file is NULL. */
extern int ZEXPORT zipAlreadyThere(zipFile file, char const *name) {
    zip64_internal *zip = file;
    if (zip == NULL)
        return ZIP_PARAMERROR;
    if (zip->central_dir.first_block == NULL)
        /* No central directory yet, so no, name isn't there. */
        return 0;
    if (setjmp(zip->set.env)) {
        /* Memory allocation failure. */
        set_end(&zip->set);
        return -2;
    }
    if (!set_ok(&zip->set)) {
        /* This is the first time here with some central directory content. We
        // construct this set of names only on demand. Prepare set and block. */
        set_start(&zip->set);
        block_init(&zip->block, &zip->central_dir);
    }

    /* Update the set of names from the current central directory contents.
    // This reads any new central directory records since the last time we were
    // here. */
    for (;;) {
        char *there = block_central_name(&zip->block, &zip->set);
        if (there == NULL) {
            if (zip->block.next == NULL)
                /* The central directory is invalid. */
                return -1;
            break;
        }

        /* Add there to the set. */
        if (set_insert(&zip->set, there))
            /* There's already a duplicate in the central directory! We'll just
            // let this be and carry on. */
            set_free(&zip->set, there);
    }

    /* Return true if name is in the central directory. */
    size_t len = strlen(name);
    char *copy = set_alloc(&zip->set, NULL, len + 1);
    memcpy(copy, name, len + 1);
    int found = set_found(&zip->set, copy);
    set_free(&zip->set, copy);
    return found;
}


/****************************************************************************/

#ifndef NO_ADDFILEINEXISTINGZIP
/* ===========================================================================
   Inputs a long in LSB order to the given file
   nbByte == 1, 2 ,4 or 8 (byte, short or long, ZPOS64_T)
*/

local int zip64local_putValue(const zlib_filefunc64_32_def* pzlib_filefunc_def, voidpf filestream, ZPOS64_T x, int nbByte) {
    unsigned char buf[8];
    int n;
    for (n = 0; n < nbByte; n++)
    {
        buf[n] = (unsigned char)(x & 0xff);
        x >>= 8;
    }
    if (x != 0)
      {     /* data overflow - hack for ZIP64 (X Roche) */
      for (n = 0; n < nbByte; n++)
        {
          buf[n] = 0xff;
        }
      }

    if (ZWRITE64(*pzlib_filefunc_def,filestream,buf,(uLong)nbByte)!=(uLong)nbByte)
        return ZIP_ERRNO;
    else
        return ZIP_OK;
}

local void zip64local_putValue_inmemory (void* dest, ZPOS64_T x, int nbByte) {
    unsigned char* buf=(unsigned char*)dest;
    int n;
    for (n = 0; n < nbByte; n++) {
        buf[n] = (unsigned char)(x & 0xff);
        x >>= 8;
    }

    if (x != 0)
    {     /* data overflow - hack for ZIP64 */
       for (n = 0; n < nbByte; n++)
       {
          buf[n] = 0xff;
       }
    }
}

/****************************************************************************/


local uLong zip64local_TmzDateToDosDate(const tm_zip* ptm) {
    uLong year = (uLong)ptm->tm_year;
    if (year>=1980)
        year-=1980;
    else if (year>=80)
        year-=80;
    return
      (uLong) (((uLong)(ptm->tm_mday) + (32 * (uLong)(ptm->tm_mon+1)) + (512 * year)) << 16) |
        (((uLong)ptm->tm_sec/2) + (32 * (uLong)ptm->tm_min) + (2048 * (uLong)ptm->tm_hour));
}


/****************************************************************************/

local int zip64local_getByte(const zlib_filefunc64_32_def* pzlib_filefunc_def, voidpf filestream, int* pi) {
    unsigned char c;
    int err = (int)ZREAD64(*pzlib_filefunc_def,filestream,&c,1);
    if (err==1)
    {
        *pi = (int)c;
        return ZIP_OK;
    }
    else
    {
        if (ZERROR64(*pzlib_filefunc_def,filestream))
            return ZIP_ERRNO;
        else
            return ZIP_EOF;
    }
}


/* ===========================================================================
   Reads a long in LSB order from the given gz_stream. Sets
*/
local int zip64local_getShort(const zlib_filefunc64_32_def* pzlib_filefunc_def, voidpf filestream, uLong* pX) {
    uLong x ;
    int i = 0;
    int err;

    err = zip64local_getByte(pzlib_filefunc_def,filestream,&i);
    x = (uLong)i;

    if (err==ZIP_OK)
        err = zip64local_getByte(pzlib_filefunc_def,filestream,&i);
    x += ((uLong)i)<<8;

    if (err==ZIP_OK)
        *pX = x;
    else
        *pX = 0;
    return err;
}

local int zip64local_getLong(const zlib_filefunc64_32_def* pzlib_filefunc_def, voidpf filestream, uLong* pX) {
    uLong x ;
    int i = 0;
    int err;

    err = zip64local_getByte(pzlib_filefunc_def,filestream,&i);
    x = (uLong)i;

    if (err==ZIP_OK)
        err = zip64local_getByte(pzlib_filefunc_def,filestream,&i);
    x += ((uLong)i)<<8;

    if (err==ZIP_OK)
        err = zip64local_getByte(pzlib_filefunc_def,filestream,&i);
    x += ((uLong)i)<<16;

    if (err==ZIP_OK)
        err = zip64local_getByte(pzlib_filefunc_def,filestream,&i);
    x += ((uLong)i)<<24;

    if (err==ZIP_OK)
        *pX = x;
    else
        *pX = 0;
    return err;
}


local int zip64local_getLong64(const zlib_filefunc64_32_def* pzlib_filefunc_def, voidpf filestream, ZPOS64_T *pX) {
  ZPOS64_T x;
  int i = 0;
  int err;

  err = zip64local_getByte(pzlib_filefunc_def,filestream,&i);
  x = (ZPOS64_T)i;

  if (err==ZIP_OK)
    err = zip64local_getByte(pzlib_filefunc_def,filestream,&i);
  x += ((ZPOS64_T)i)<<8;

  if (err==ZIP_OK)
    err = zip64local_getByte(pzlib_filefunc_def,filestream,&i);
  x += ((ZPOS64_T)i)<<16;

  if (err==ZIP_OK)
    err = zip64local_getByte(pzlib_filefunc_def,filestream,&i);
  x += ((ZPOS64_T)i)<<24;

  if (err==ZIP_OK)
    err = zip64local_getByte(pzlib_filefunc_def,filestream,&i);
  x += ((ZPOS64_T)i)<<32;

  if (err==ZIP_OK)
    err = zip64local_getByte(pzlib_filefunc_def,filestream,&i);
  x += ((ZPOS64_T)i)<<40;

  if (err==ZIP_OK)
    err = zip64local_getByte(pzlib_filefunc_def,filestream,&i);
  x += ((ZPOS64_T)i)<<48;

  if (err==ZIP_OK)
    err = zip64local_getByte(pzlib_filefunc_def,filestream,&i);
  x += ((ZPOS64_T)i)<<56;

  if (err==ZIP_OK)
    *pX = x;
  else
    *pX = 0;

  return err;
}

#ifndef BUFREADCOMMENT
#define BUFREADCOMMENT (0x400)
#endif
/*
  Locate the Central directory of a zipfile (at the end, just before
    the global comment)
*/
local ZPOS64_T zip64local_SearchCentralDir(const zlib_filefunc64_32_def* pzlib_filefunc_def, voidpf filestream) {
  unsigned char* buf;
  ZPOS64_T uSizeFile;
  ZPOS64_T uBackRead;
  ZPOS64_T uMaxBack=0xffff; /* maximum size of global comment */
  ZPOS64_T uPosFound=0;

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


  uSizeFile = ZTELL64(*pzlib_filefunc_def,filestream);

  if (uMaxBack>uSizeFile)
    uMaxBack = uSizeFile;

  buf = (unsigned char*)ALLOC(BUFREADCOMMENT+4);
  if (buf==NULL)
    return 0;

  uBackRead = 4;
  while (uBackRead<uMaxBack)
  {
    uLong uReadSize;
    ZPOS64_T uReadPos ;
    int i;
    if (uBackRead+BUFREADCOMMENT>uMaxBack)
      uBackRead = uMaxBack;
    else
      uBackRead+=BUFREADCOMMENT;
    uReadPos = uSizeFile-uBackRead ;

    uReadSize = ((BUFREADCOMMENT+4) < (uSizeFile-uReadPos)) ?
      (BUFREADCOMMENT+4) : (uLong)(uSizeFile-uReadPos);
    if (ZSEEK64(*pzlib_filefunc_def,filestream,uReadPos,ZLIB_FILEFUNC_SEEK_SET)!=0)
      break;

    if (ZREAD64(*pzlib_filefunc_def,filestream,buf,uReadSize)!=uReadSize)
      break;

    for (i=(int)uReadSize-3; (i--)>0;)
      if (((*(buf+i))==0x50) && ((*(buf+i+1))==0x4b) &&
        ((*(buf+i+2))==0x05) && ((*(buf+i+3))==0x06))
      {
        uPosFound = uReadPos+(unsigned)i;
        break;
      }

    if (uPosFound!=0)
      break;
  }
  free(buf);
  return uPosFound;
}

/*
Locate the End of Zip64 Central directory locator and from there find the CD of a zipfile (at the end, just before
the global comment)
*/
local ZPOS64_T zip64local_SearchCentralDir64(const zlib_filefunc64_32_def* pzlib_filefunc_def, voidpf filestream) {
  unsigned char* buf;
  ZPOS64_T uSizeFile;
  ZPOS64_T uBackRead;
  ZPOS64_T uMaxBack=0xffff; /* maximum size of global comment */
  ZPOS64_T uPosFound=0;
  uLong uL;
  ZPOS64_T relativeOffset;

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

  uSizeFile = ZTELL64(*pzlib_filefunc_def,filestream);

  if (uMaxBack>uSizeFile)
    uMaxBack = uSizeFile;

  buf = (unsigned char*)ALLOC(BUFREADCOMMENT+4);
  if (buf==NULL)
    return 0;

  uBackRead = 4;
  while (uBackRead<uMaxBack)
  {
    uLong uReadSize;
    ZPOS64_T uReadPos;
    int i;
    if (uBackRead+BUFREADCOMMENT>uMaxBack)
      uBackRead = uMaxBack;
    else
      uBackRead+=BUFREADCOMMENT;
    uReadPos = uSizeFile-uBackRead ;

    uReadSize = ((BUFREADCOMMENT+4) < (uSizeFile-uReadPos)) ?
      (BUFREADCOMMENT+4) : (uLong)(uSizeFile-uReadPos);
    if (ZSEEK64(*pzlib_filefunc_def,filestream,uReadPos,ZLIB_FILEFUNC_SEEK_SET)!=0)
      break;

    if (ZREAD64(*pzlib_filefunc_def,filestream,buf,uReadSize)!=uReadSize)
      break;

    for (i=(int)uReadSize-3; (i--)>0;)
    {
      /* Signature "0x07064b50" Zip64 end of central directory locator */
      if (((*(buf+i))==0x50) && ((*(buf+i+1))==0x4b) && ((*(buf+i+2))==0x06) && ((*(buf+i+3))==0x07))
      {
        uPosFound = uReadPos+(unsigned)i;
        break;
      }
    }

      if (uPosFound!=0)
        break;
  }

  free(buf);
  if (uPosFound == 0)
    return 0;

  /* Zip64 end of central directory locator */
  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)
    return 0;

  /* total number of disks */
  if (zip64local_getLong(pzlib_filefunc_def,filestream,&uL)!=ZIP_OK)
    return 0;
  if (uL != 1)
    return 0;

  /* Goto Zip64 end of central directory record */
  if (ZSEEK64(*pzlib_filefunc_def,filestream, relativeOffset,ZLIB_FILEFUNC_SEEK_SET)!=0)
    return 0;

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

  if (uL != 0x06064b50) /* signature of 'Zip64 end of central directory' */
    return 0;

  return relativeOffset;
}

local int LoadCentralDirectoryRecord(zip64_internal* pziinit) {
  int err=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;
  uLong size_comment;

  int hasZIP64Record = 0;

  /* check first if we find a ZIP64 record */
  central_pos = zip64local_SearchCentralDir64(&pziinit->z_filefunc,pziinit->filestream);
  if(central_pos > 0)
  {
    hasZIP64Record = 1;
  }
  else if(central_pos == 0)
  {
    central_pos = zip64local_SearchCentralDir(&pziinit->z_filefunc,pziinit->filestream);
  }

/* disable to allow appending to empty ZIP archive
        if (central_pos==0)
            err=ZIP_ERRNO;
*/

  if(hasZIP64Record)
  {
    ZPOS64_T sizeEndOfCentralDirectory;
    if (ZSEEK64(pziinit->z_filefunc, pziinit->filestream, central_pos, ZLIB_FILEFUNC_SEEK_SET) != 0)
      err=ZIP_ERRNO;

    /* the signature, already checked */
    if (zip64local_getLong(&pziinit->z_filefunc, pziinit->filestream,&uL)!=ZIP_OK)
      err=ZIP_ERRNO;

    /* size of zip64 end of central directory record */
    if (zip64local_getLong64(&pziinit->z_filefunc, pziinit->filestream, &sizeEndOfCentralDirectory)!=ZIP_OK)
      err=ZIP_ERRNO;

    /* version made by */
    if (zip64local_getShort(&pziinit->z_filefunc, pziinit->filestream, &VersionMadeBy)!=ZIP_OK)
      err=ZIP_ERRNO;

    /* version needed to extract */
    if (zip64local_getShort(&pziinit->z_filefunc, pziinit->filestream, &VersionNeeded)!=ZIP_OK)
      err=ZIP_ERRNO;

    /* number of this disk */
    if (zip64local_getLong(&pziinit->z_filefunc, pziinit->filestream,&number_disk)!=ZIP_OK)
      err=ZIP_ERRNO;

    /* number of the disk with the start of the central directory */
    if (zip64local_getLong(&pziinit->z_filefunc, pziinit->filestream,&number_disk_with_CD)!=ZIP_OK)
      err=ZIP_ERRNO;

    /* total number of entries in the central directory on this disk */
    if (zip64local_getLong64(&pziinit->z_filefunc, pziinit->filestream, &number_entry)!=ZIP_OK)
      err=ZIP_ERRNO;

    /* total number of entries in the central directory */
    if (zip64local_getLong64(&pziinit->z_filefunc, pziinit->filestream,&number_entry_CD)!=ZIP_OK)
      err=ZIP_ERRNO;

    if ((number_entry_CD!=number_entry) || (number_disk_with_CD!=0) || (number_disk!=0))
      err=ZIP_BADZIPFILE;

    /* size of the central directory */
    if (zip64local_getLong64(&pziinit->z_filefunc, pziinit->filestream,&size_central_dir)!=ZIP_OK)
      err=ZIP_ERRNO;

    /* offset of start of central directory with respect to the
    starting disk number */
    if (zip64local_getLong64(&pziinit->z_filefunc, pziinit->filestream,&offset_central_dir)!=ZIP_OK)
      err=ZIP_ERRNO;

    /* TODO..
    // read the comment from the standard central header. */
    size_comment = 0;
  }
  else
  {
    /* Read End of central Directory info */
    if (ZSEEK64(pziinit->z_filefunc, pziinit->filestream, central_pos,ZLIB_FILEFUNC_SEEK_SET)!=0)
      err=ZIP_ERRNO;

    /* the signature, already checked */
    if (zip64local_getLong(&pziinit->z_filefunc, pziinit->filestream,&uL)!=ZIP_OK)
      err=ZIP_ERRNO;

    /* number of this disk */
    if (zip64local_getShort(&pziinit->z_filefunc, pziinit->filestream,&number_disk)!=ZIP_OK)
      err=ZIP_ERRNO;

    /* number of the disk with the start of the central directory */
    if (zip64local_getShort(&pziinit->z_filefunc, pziinit->filestream,&number_disk_with_CD)!=ZIP_OK)
      err=ZIP_ERRNO;

    /* total number of entries in the central dir on this disk */
    number_entry = 0;
    if (zip64local_getShort(&pziinit->z_filefunc, pziinit->filestream, &uL)!=ZIP_OK)
      err=ZIP_ERRNO;
    else
      number_entry = uL;

    /* total number of entries in the central dir */
    number_entry_CD = 0;
    if (zip64local_getShort(&pziinit->z_filefunc, pziinit->filestream, &uL)!=ZIP_OK)
      err=ZIP_ERRNO;
    else
      number_entry_CD = uL;

    if ((number_entry_CD!=number_entry) || (number_disk_with_CD!=0) || (number_disk!=0))
      err=ZIP_BADZIPFILE;

    /* size of the central directory */
    size_central_dir = 0;
    if (zip64local_getLong(&pziinit->z_filefunc, pziinit->filestream, &uL)!=ZIP_OK)
      err=ZIP_ERRNO;
    else
      size_central_dir = uL;

    /* offset of start of central directory with respect to the starting disk number */
    offset_central_dir = 0;
    if (zip64local_getLong(&pziinit->z_filefunc, pziinit->filestream, &uL)!=ZIP_OK)
      err=ZIP_ERRNO;
    else
      offset_central_dir = uL;


    /* zipfile global comment length */
    if (zip64local_getShort(&pziinit->z_filefunc, pziinit->filestream, &size_comment)!=ZIP_OK)
      err=ZIP_ERRNO;
  }

  if ((central_pos<offset_central_dir+size_central_dir) &&
    (err==ZIP_OK))
    err=ZIP_BADZIPFILE;

  if (err!=ZIP_OK)
  {
    ZCLOSE64(pziinit->z_filefunc, pziinit->filestream);
    return ZIP_ERRNO;
  }

  if (size_comment>0)
  {
    pziinit->globalcomment = (char*)ALLOC(size_comment+1);
    if (pziinit->globalcomment)
    {
      size_comment = ZREAD64(pziinit->z_filefunc, pziinit->filestream, pziinit->globalcomment,size_comment);
      pziinit->globalcomment[size_comment]=0;
    }
  }

  byte_before_the_zipfile = central_pos - (offset_central_dir+size_central_dir);
  pziinit->add_position_when_writing_offset = byte_before_the_zipfile;

  {
    ZPOS64_T size_central_dir_to_read = size_central_dir;
    size_t buf_size = SIZEDATA_INDATABLOCK;
    void* buf_read = (void*)ALLOC(buf_size);
    if (ZSEEK64(pziinit->z_filefunc, pziinit->filestream, offset_central_dir + byte_before_the_zipfile, ZLIB_FILEFUNC_SEEK_SET) != 0)
      err=ZIP_ERRNO;

    while ((size_central_dir_to_read>0) && (err==ZIP_OK))
    {
      ZPOS64_T read_this = SIZEDATA_INDATABLOCK;
      if (read_this > size_central_dir_to_read)
        read_this = size_central_dir_to_read;

      if (ZREAD64(pziinit->z_filefunc, pziinit->filestream,buf_read,(uLong)read_this) != read_this)
        err=ZIP_ERRNO;

      if (err==ZIP_OK)
        err = add_data_in_datablock(&pziinit->central_dir,buf_read, (uLong)read_this);

      size_central_dir_to_read-=read_this;
    }
    free(buf_read);
  }
  pziinit->begin_pos = byte_before_the_zipfile;
  pziinit->number_entry = number_entry_CD;

  if (ZSEEK64(pziinit->z_filefunc, pziinit->filestream, offset_central_dir+byte_before_the_zipfile,ZLIB_FILEFUNC_SEEK_SET) != 0)
    err=ZIP_ERRNO;

  return err;
}


#endif /* !NO_ADDFILEINEXISTINGZIP*/


/************************************************************/
extern zipFile ZEXPORT zipOpen3(const void *pathname, int append, zipcharpc* globalcomment, zlib_filefunc64_32_def* pzlib_filefunc64_32_def) {
    zip64_internal* zi;
    int err=ZIP_OK;

    if (!(zi = (zip64_internal*)ALLOC(sizeof(zip64_internal))))
      return NULL;

    zi->z_filefunc.zseek32_file = NULL;
    zi->z_filefunc.ztell32_file = NULL;
    if (pzlib_filefunc64_32_def==NULL)
        fill_fopen64_filefunc(&zi->z_filefunc.zfile_func64);
    else
        zi->z_filefunc = *pzlib_filefunc64_32_def;

    zi->filestream = ZOPEN64(zi->z_filefunc,
                  pathname,
                  (append == APPEND_STATUS_CREATE) ?
                  (ZLIB_FILEFUNC_MODE_READ | ZLIB_FILEFUNC_MODE_WRITE | ZLIB_FILEFUNC_MODE_CREATE) :
                    (ZLIB_FILEFUNC_MODE_READ | ZLIB_FILEFUNC_MODE_WRITE | ZLIB_FILEFUNC_MODE_EXISTING));

    if (zi->filestream == NULL)
    {
        free(zi);
        return NULL;
    }

    if (append == APPEND_STATUS_CREATEAFTER)
        ZSEEK64(zi->z_filefunc,zi->filestream,0,SEEK_END);

    zi->begin_pos = ZTELL64(zi->z_filefunc,zi->filestream);
    zi->in_opened_file_inzip = 0;
    zi->ci.stream_initialised = 0;
    zi->number_entry = 0;
    zi->add_position_when_writing_offset = 0;
    init_linkedlist(&(zi->central_dir));
    memset(&(zi->set), 0, sizeof(set_t));  /* make sure set appears dormant */

    /* now we add file in a zipfile */
#    ifndef NO_ADDFILEINEXISTINGZIP
    zi->globalcomment = NULL;
    if (append == APPEND_STATUS_ADDINZIP)
    {
      /* Read and Cache Central Directory Records */
      err = LoadCentralDirectoryRecord(zi);
    }

    if (globalcomment)
    {
      *globalcomment = zi->globalcomment;
    }
#    endif /* !NO_ADDFILEINEXISTINGZIP*/

    if (err != ZIP_OK)
    {
#    ifndef NO_ADDFILEINEXISTINGZIP
        free(zi->globalcomment);
#    endif /* !NO_ADDFILEINEXISTINGZIP*/
        free(zi);
        return NULL;
    }
    else
    {
        return (zipFile)zi;
    }
}

extern zipFile ZEXPORT zipOpen2(const char *pathname, int append, zipcharpc* globalcomment, zlib_filefunc_def* pzlib_filefunc32_def) {
    if (pzlib_filefunc32_def != NULL)
    {
        zlib_filefunc64_32_def zlib_filefunc64_32_def_fill;
        fill_zlib_filefunc64_32_def_from_filefunc32(&zlib_filefunc64_32_def_fill,pzlib_filefunc32_def);
        return zipOpen3(pathname, append, globalcomment, &zlib_filefunc64_32_def_fill);
    }
    else
        return zipOpen3(pathname, append, globalcomment, NULL);
}

extern zipFile ZEXPORT zipOpen2_64(const void *pathname, int append, zipcharpc* globalcomment, zlib_filefunc64_def* pzlib_filefunc_def) {
    if (pzlib_filefunc_def != NULL)
    {
        zlib_filefunc64_32_def zlib_filefunc64_32_def_fill;
        zlib_filefunc64_32_def_fill.zfile_func64 = *pzlib_filefunc_def;
        zlib_filefunc64_32_def_fill.zopen32_file = NULL;
        zlib_filefunc64_32_def_fill.ztell32_file = NULL;
        zlib_filefunc64_32_def_fill.zseek32_file = NULL;
        return zipOpen3(pathname, append, globalcomment, &zlib_filefunc64_32_def_fill);
    }
    else
        return zipOpen3(pathname, append, globalcomment, NULL);
}



extern zipFile ZEXPORT zipOpen(const char* pathname, int append) {
    return zipOpen3((const void*)pathname,append,NULL,NULL);
}

extern zipFile ZEXPORT zipOpen64(const void* pathname, int append) {
    return zipOpen3(pathname,append,NULL,NULL);
}

local int Write_LocalFileHeader(zip64_internal* zi, const char* filename, uInt size_extrafield_local, const void* extrafield_local) {
  /* write the local header */
  int err;
  uInt size_filename = (uInt)strlen(filename);
  uInt size_extrafield = size_extrafield_local;

  err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)LOCALHEADERMAGIC, 4);

  if (err==ZIP_OK)
  {
    if(zi->ci.zip64)
      err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)45,2);/* version needed to extract */
    else
      err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)20,2);/* version needed to extract */
  }

  if (err==ZIP_OK)
    err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)zi->ci.flag,2);

  if (err==ZIP_OK)
    err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)zi->ci.method,2);

  if (err==ZIP_OK)
    err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)zi->ci.dosDate,4);

  /* CRC / Compressed size / Uncompressed size will be filled in later and rewritten later */
  if (err==ZIP_OK)
    err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)0,4); /* crc 32, unknown */
  if (err==ZIP_OK)
  {
    if(zi->ci.zip64)
      err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)0xFFFFFFFF,4); /* compressed size, unknown */
    else
      err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)0,4); /* compressed size, unknown */
  }
  if (err==ZIP_OK)
  {
    if(zi->ci.zip64)
      err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)0xFFFFFFFF,4); /* uncompressed size, unknown */
    else
      err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)0,4); /* uncompressed size, unknown */
  }

  if (err==ZIP_OK)
    err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)size_filename,2);

  if(zi->ci.zip64)
  {
    size_extrafield += 20;
  }

  if (err==ZIP_OK)
    err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)size_extrafield,2);

  if ((err==ZIP_OK) && (size_filename > 0))
  {
    if (ZWRITE64(zi->z_filefunc,zi->filestream,filename,size_filename)!=size_filename)
      err = ZIP_ERRNO;
  }

  if ((err==ZIP_OK) && (size_extrafield_local > 0))
  {
    if (ZWRITE64(zi->z_filefunc, zi->filestream, extrafield_local, size_extrafield_local) != size_extrafield_local)
      err = ZIP_ERRNO;
  }


  if ((err==ZIP_OK) && (zi->ci.zip64))
  {
      /* write the Zip64 extended info */
      short HeaderID = 1;
      short DataSize = 16;
      ZPOS64_T CompressedSize = 0;
      ZPOS64_T UncompressedSize = 0;

      /* Remember position of Zip64 extended info for the local file header. (needed when we update size after done with file) */
      zi->ci.pos_zip64extrainfo = ZTELL64(zi->z_filefunc,zi->filestream);

      err = zip64local_putValue(&zi->z_filefunc, zi->filestream, (ZPOS64_T)HeaderID,2);
      err = zip64local_putValue(&zi->z_filefunc, zi->filestream, (ZPOS64_T)DataSize,2);

      err = zip64local_putValue(&zi->z_filefunc, zi->filestream, (ZPOS64_T)UncompressedSize,8);
      err = zip64local_putValue(&zi->z_filefunc, zi->filestream, (ZPOS64_T)CompressedSize,8);
  }

  return err;
}

/* Return the length of the UTF-8 code at str[0..len-1] in [1..4], or negative
   if there is no valid UTF-8 code there. If negative, it is minus the number
   of bytes examined in order to determine it was bad. Or if minus the return
   code is one less than len, then at least one more byte than provided would
   be needed to complete the code. */
local int utf8len(unsigned char const *str, size_t len) {
    return
        len == 0 ? -1 :                         /* empty input */
        str[0] < 0x80 ? 1 :                     /* good one-byte */
        str[0] < 0xc0 ? -1 :                    /* bad first byte */
        len < 2 || (str[1] >> 6) != 2 ? -2 :    /* missing or bad 2nd byte */
        str[0] < 0xc2 ? -2 :                    /* overlong code */
        str[0] < 0xe0 ? 2 :                     /* good two-byte */
        len < 3 || (str[2] >> 6) != 2 ? -3 :    /* missing or bad 3rd byte */
        str[0] == 0xe0 && str[1] < 0xa0 ? -3 :  /* overlong code */
        str[0] < 0xf0 ? 3 :                     /* good three-byte */
        len < 4 || (str[3] >> 6) != 2 ? -4 :    /* missing or bad 4th byte */
        str[0] == 0xf0 && str[1] < 0x90 ? -4 :  /* overlong code */
        str[0] < 0xf4 ||
        (str[0] == 0xf4 && str[1] < 0x90) ? 4 : /* good four-byte */
        -4;                                     /* code > 0x10ffff */
}

/* Return true if str[0..len-1] is valid UTF-8 *and* it contains at least one
   code of two or more bytes. This is used to determine whether or not to set
   bit 11 in the zip header flags. */
local int isutf8(char const *str, size_t len) {
    int utf8 = 0;
    while (len) {
        int code = utf8len((unsigned char const *)str, len);
        if (code < 0)
            return 0;
        if (code > 1)
            utf8 = 1;
        str += code;
        len -= (unsigned)code;
    }
    return utf8;
}

/*
 NOTE.
 When writing RAW the ZIP64 extended information in extrafield_local and extrafield_global needs to be stripped
 before calling this function it can be done with zipRemoveExtraInfoBlock

 It is not done here because then we need to realloc a new buffer since parameters are 'const' and I want to minimize
 unnecessary allocations.
 */
extern int ZEXPORT zipOpenNewFileInZip4_64(zipFile file, const char* filename, const zip_fileinfo* zipfi,
                                           const void* extrafield_local, uInt size_extrafield_local,
                                           const void* extrafield_global, uInt size_extrafield_global,
                                           const char* comment, int method, int level, int raw,
                                           int windowBits,int memLevel, int strategy,
                                           const char* password, uLong crcForCrypting,
                                           uLong versionMadeBy, uLong flagBase, int zip64) {
    zip64_internal* zi;
    uInt size_filename;
    uInt size_comment;
    uInt i;
    int err = ZIP_OK;

#    ifdef NOCRYPT
    if (password != NULL)
        return ZIP_PARAMERROR;
#    endif

    if (file == NULL)
        return ZIP_PARAMERROR;

#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)
            return err;
    }

    if (filename==NULL)
        filename="-";

    if (comment==NULL)
        size_comment = 0;
    else
        size_comment = (uInt)strlen(comment);

    size_filename = (uInt)strlen(filename);

    if (zipfi == NULL)
        zi->ci.dosDate = 0;
    else
    {
        if (zipfi->dosDate != 0)
            zi->ci.dosDate = zipfi->dosDate;
        else
          zi->ci.dosDate = zip64local_TmzDateToDosDate(&zipfi->tmz_date);
    }

    zi->ci.flag = flagBase;
    if ((level==8) || (level==9))
      zi->ci.flag |= 2;
    if (level==2)
      zi->ci.flag |= 4;
    if (level==1)
      zi->ci.flag |= 6;
    if (password != NULL)
      zi->ci.flag |= 1;
    if (isutf8(filename, size_filename) &&
        (size_comment == 0 || isutf8(comment, size_comment)))
      zi->ci.flag |= (1 << 11);

    zi->ci.crc32 = 0;
    zi->ci.method = method;
    zi->ci.encrypt = 0;
    zi->ci.stream_initialised = 0;
    zi->ci.pos_in_buffered_data = 0;
    zi->ci.raw = raw;
    zi->ci.pos_local_header = ZTELL64(zi->z_filefunc,zi->filestream);

    zi->ci.size_centralheader = SIZECENTRALHEADER + size_filename + size_extrafield_global + size_comment;
    zi->ci.size_centralExtraFree = 32; /* Extra space we have reserved in case we need to add ZIP64 extra info data */

    zi->ci.central_header = (char*)ALLOC((uInt)zi->ci.size_centralheader + zi->ci.size_centralExtraFree);

    zi->ci.size_centralExtra = size_extrafield_global;
    zip64local_putValue_inmemory(zi->ci.central_header,(uLong)CENTRALHEADERMAGIC,4);
    /* version info */
    zip64local_putValue_inmemory(zi->ci.central_header+4,(uLong)versionMadeBy,2);
    zip64local_putValue_inmemory(zi->ci.central_header+6,(uLong)20,2);
    zip64local_putValue_inmemory(zi->ci.central_header+8,(uLong)zi->ci.flag,2);
    zip64local_putValue_inmemory(zi->ci.central_header+10,(uLong)zi->ci.method,2);
    zip64local_putValue_inmemory(zi->ci.central_header+12,(uLong)zi->ci.dosDate,4);
    zip64local_putValue_inmemory(zi->ci.central_header+16,(uLong)0,4); /*crc*/
    zip64local_putValue_inmemory(zi->ci.central_header+20,(uLong)0,4); /*compr size*/
    zip64local_putValue_inmemory(zi->ci.central_header+24,(uLong)0,4); /*uncompr size*/
    zip64local_putValue_inmemory(zi->ci.central_header+28,(uLong)size_filename,2);
    zip64local_putValue_inmemory(zi->ci.central_header+30,(uLong)size_extrafield_global,2);
    zip64local_putValue_inmemory(zi->ci.central_header+32,(uLong)size_comment,2);
    zip64local_putValue_inmemory(zi->ci.central_header+34,(uLong)0,2); /*disk nm start*/

    if (zipfi==NULL)
        zip64local_putValue_inmemory(zi->ci.central_header+36,(uLong)0,2);
    else
        zip64local_putValue_inmemory(zi->ci.central_header+36,(uLong)zipfi->internal_fa,2);

    if (zipfi==NULL)
        zip64local_putValue_inmemory(zi->ci.central_header+38,(uLong)0,4);
    else
        zip64local_putValue_inmemory(zi->ci.central_header+38,(uLong)zipfi->external_fa,4);

    if(zi->ci.pos_local_header >= 0xffffffff)
      zip64local_putValue_inmemory(zi->ci.central_header+42,(uLong)0xffffffff,4);
    else
      zip64local_putValue_inmemory(zi->ci.central_header+42,(uLong)zi->ci.pos_local_header - zi->add_position_when_writing_offset,4);

    for (i=0;i<size_filename;i++)
        *(zi->ci.central_header+SIZECENTRALHEADER+i) = *(filename+i);

    for (i=0;i<size_extrafield_global;i++)
        *(zi->ci.central_header+SIZECENTRALHEADER+size_filename+i) =
              *(((const char*)extrafield_global)+i);

    for (i=0;i<size_comment;i++)
        *(zi->ci.central_header+SIZECENTRALHEADER+size_filename+
              size_extrafield_global+i) = *(comment+i);
    if (zi->ci.central_header == NULL)
        return ZIP_INTERNALERROR;

    zi->ci.zip64 = zip64;
    zi->ci.totalCompressedData = 0;
    zi->ci.totalUncompressedData = 0;
    zi->ci.pos_zip64extrainfo = 0;

    err = Write_LocalFileHeader(zi, filename, size_extrafield_local, extrafield_local);

#ifdef HAVE_BZIP2
    zi->ci.bstream.avail_in = (uInt)0;
    zi->ci.bstream.avail_out = (uInt)Z_BUFSIZE;
    zi->ci.bstream.next_out = (char*)zi->ci.buffered_data;
    zi->ci.bstream.total_in_hi32 = 0;
    zi->ci.bstream.total_in_lo32 = 0;
    zi->ci.bstream.total_out_hi32 = 0;
    zi->ci.bstream.total_out_lo32 = 0;
#endif

    zi->ci.stream.avail_in = (uInt)0;
    zi->ci.stream.avail_out = (uInt)Z_BUFSIZE;
    zi->ci.stream.next_out = zi->ci.buffered_data;
    zi->ci.stream.total_in = 0;
    zi->ci.stream.total_out = 0;
    zi->ci.stream.data_type = Z_BINARY;

#ifdef HAVE_BZIP2
    if ((err==ZIP_OK) && (zi->ci.method == Z_DEFLATED || zi->ci.method == Z_BZIP2ED) && (!zi->ci.raw))
#else
    if ((err==ZIP_OK) && (zi->ci.method == Z_DEFLATED) && (!zi->ci.raw))
#endif
    {
        if(zi->ci.method == Z_DEFLATED)
        {
          zi->ci.stream.zalloc = (alloc_func)0;
          zi->ci.stream.zfree = (free_func)0;
          zi->ci.stream.opaque = (voidpf)0;

          if (windowBits>0)
              windowBits = -windowBits;

          err = deflateInit2(&zi->ci.stream, level, Z_DEFLATED, windowBits, memLevel, strategy);

          if (err==Z_OK)
              zi->ci.stream_initialised = Z_DEFLATED;
        }
        else if(zi->ci.method == Z_BZIP2ED)
        {
#ifdef HAVE_BZIP2
            /* Init BZip stuff here */
          zi->ci.bstream.bzalloc = 0;
          zi->ci.bstream.bzfree = 0;
          zi->ci.bstream.opaque = (voidpf)0;

          err = BZ2_bzCompressInit(&zi->ci.bstream, level, 0,35);
          if(err == BZ_OK)
            zi->ci.stream_initialised = Z_BZIP2ED;
#endif
        }

    }

#    ifndef NOCRYPT
    zi->ci.crypt_header_size = 0;
    if ((err==Z_OK) && (password != NULL))
    {
        unsigned char bufHead[RAND_HEAD_LEN];
        unsigned int sizeHead;
        zi->ci.encrypt = 1;
        zi->ci.pcrc_32_tab = get_crc_table();
        /*init_keys(password,zi->ci.keys,zi->ci.pcrc_32_tab);*/

        sizeHead=crypthead(password,bufHead,RAND_HEAD_LEN,zi->ci.keys,zi->ci.pcrc_32_tab,crcForCrypting);
        zi->ci.crypt_header_size = sizeHead;

        if (ZWRITE64(zi->z_filefunc,zi->filestream,bufHead,sizeHead) != sizeHead)
                err = ZIP_ERRNO;
    }
#    endif

    if (err==Z_OK)
        zi->in_opened_file_inzip = 1;
    return err;
}

extern int ZEXPORT zipOpenNewFileInZip4(zipFile file, const char* filename, const zip_fileinfo* zipfi,
                                        const void* extrafield_local, uInt size_extrafield_local,
                                        const void* extrafield_global, uInt size_extrafield_global,
                                        const char* comment, int method, int level, int raw,
                                        int windowBits,int memLevel, int strategy,
                                        const char* password, uLong crcForCrypting,
                                        uLong versionMadeBy, uLong flagBase) {
    return zipOpenNewFileInZip4_64(file, filename, zipfi,
                                   extrafield_local, size_extrafield_local,
                                   extrafield_global, size_extrafield_global,
                                   comment, method, level, raw,
                                   windowBits, memLevel, strategy,
                                   password, crcForCrypting, versionMadeBy, flagBase, 0);
}

extern int ZEXPORT zipOpenNewFileInZip3(zipFile file, const char* filename, const zip_fileinfo* zipfi,
                                        const void* extrafield_local, uInt size_extrafield_local,
                                        const void* extrafield_global, uInt size_extrafield_global,
                                        const char* comment, int method, int level, int raw,
                                        int windowBits,int memLevel, int strategy,
                                        const char* password, uLong crcForCrypting) {
    return zipOpenNewFileInZip4_64(file, filename, zipfi,
                                   extrafield_local, size_extrafield_local,
                                   extrafield_global, size_extrafield_global,
                                   comment, method, level, raw,
                                   windowBits, memLevel, strategy,
                                   password, crcForCrypting, VERSIONMADEBY, 0, 0);
}

extern int ZEXPORT zipOpenNewFileInZip3_64(zipFile file, const char* filename, const zip_fileinfo* zipfi,
                                         const void* extrafield_local, uInt size_extrafield_local,
                                         const void* extrafield_global, uInt size_extrafield_global,
                                         const char* comment, int method, int level, int raw,
                                         int windowBits,int memLevel, int strategy,
                                         const char* password, uLong crcForCrypting, int zip64) {
    return zipOpenNewFileInZip4_64(file, filename, zipfi,
                                   extrafield_local, size_extrafield_local,
                                   extrafield_global, size_extrafield_global,
                                   comment, method, level, raw,
                                   windowBits, memLevel, strategy,
                                   password, crcForCrypting, VERSIONMADEBY, 0, zip64);
}

extern int ZEXPORT zipOpenNewFileInZip2(zipFile file, const char* filename, const zip_fileinfo* zipfi,
                                        const void* extrafield_local, uInt size_extrafield_local,
                                        const void* extrafield_global, uInt size_extrafield_global,
                                        const char* comment, int method, int level, int raw) {
    return zipOpenNewFileInZip4_64(file, filename, zipfi,
                                   extrafield_local, size_extrafield_local,
                                   extrafield_global, size_extrafield_global,
                                   comment, method, level, raw,
                                   -MAX_WBITS, DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY,
                                   NULL, 0, VERSIONMADEBY, 0, 0);
}

extern int ZEXPORT zipOpenNewFileInZip2_64(zipFile file, const char* filename, const zip_fileinfo* zipfi,
                                           const void* extrafield_local, uInt size_extrafield_local,
                                           const void* extrafield_global, uInt size_extrafield_global,
                                           const char* comment, int method, int level, int raw, int zip64) {
    return zipOpenNewFileInZip4_64(file, filename, zipfi,
                                   extrafield_local, size_extrafield_local,
                                   extrafield_global, size_extrafield_global,
                                   comment, method, level, raw,
                                   -MAX_WBITS, DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY,
                                   NULL, 0, VERSIONMADEBY, 0, zip64);
}

extern int ZEXPORT zipOpenNewFileInZip64(zipFile file, const char* filename, const zip_fileinfo* zipfi,
                                         const void* extrafield_local, uInt size_extrafield_local,
                                         const void*extrafield_global, uInt size_extrafield_global,
                                         const char* comment, int method, int level, int zip64) {
    return zipOpenNewFileInZip4_64(file, filename, zipfi,
                                   extrafield_local, size_extrafield_local,
                                   extrafield_global, size_extrafield_global,
                                   comment, method, level, 0,
                                   -MAX_WBITS, DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY,
                                   NULL, 0, VERSIONMADEBY, 0, zip64);
}

extern int ZEXPORT zipOpenNewFileInZip(zipFile file, const char* filename, const zip_fileinfo* zipfi,
                                       const void* extrafield_local, uInt size_extrafield_local,
                                       const void*extrafield_global, uInt size_extrafield_global,
                                       const char* comment, int method, int level) {
    return zipOpenNewFileInZip4_64(file, filename, zipfi,
                                   extrafield_local, size_extrafield_local,
                                   extrafield_global, size_extrafield_global,
                                   comment, method, level, 0,
                                   -MAX_WBITS, DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY,
                                   NULL, 0, VERSIONMADEBY, 0, 0);
}

local int zip64FlushWriteBuffer(zip64_internal* zi) {
    int err=ZIP_OK;

    if (zi->ci.encrypt != 0)
    {
#ifndef NOCRYPT
        uInt i;
        int t;
        for (i=0;i<zi->ci.pos_in_buffered_data;i++)
            zi->ci.buffered_data[i] = zencode(zi->ci.keys, zi->ci.pcrc_32_tab, zi->ci.buffered_data[i],t);
#endif
    }

    if (ZWRITE64(zi->z_filefunc,zi->filestream,zi->ci.buffered_data,zi->ci.pos_in_buffered_data) != zi->ci.pos_in_buffered_data)
      err = ZIP_ERRNO;

    zi->ci.totalCompressedData += zi->ci.pos_in_buffered_data;

#ifdef HAVE_BZIP2
    if(zi->ci.method == Z_BZIP2ED)
    {
      zi->ci.totalUncompressedData += zi->ci.bstream.total_in_lo32;
      zi->ci.bstream.total_in_lo32 = 0;
      zi->ci.bstream.total_in_hi32 = 0;
    }
    else
#endif
    {
      zi->ci.totalUncompressedData += zi->ci.stream.total_in;
      zi->ci.stream.total_in = 0;
    }


    zi->ci.pos_in_buffered_data = 0;

    return err;
}

extern int ZEXPORT zipWriteInFileInZip(zipFile file, const void* buf, unsigned int len) {
    zip64_internal* zi;
    int err=ZIP_OK;

    if (file == NULL)
        return ZIP_PARAMERROR;
    zi = (zip64_internal*)file;

    if (zi->in_opened_file_inzip == 0)
        return ZIP_PARAMERROR;

    zi->ci.crc32 = crc32(zi->ci.crc32,buf,(uInt)len);

#ifdef HAVE_BZIP2
    if(zi->ci.method == Z_BZIP2ED && (!zi->ci.raw))
    {
      zi->ci.bstream.next_in = (void*)buf;
      zi->ci.bstream.avail_in = len;
      err = BZ_RUN_OK;

      while ((err==BZ_RUN_OK) && (zi->ci.bstream.avail_in>0))
      {
        if (zi->ci.bstream.avail_out == 0)
        {
          if (zip64FlushWriteBuffer(zi) == ZIP_ERRNO)
            err = ZIP_ERRNO;
          zi->ci.bstream.avail_out = (uInt)Z_BUFSIZE;
          zi->ci.bstream.next_out = (char*)zi->ci.buffered_data;
        }


        if(err != BZ_RUN_OK)
          break;

        if ((zi->ci.method == Z_BZIP2ED) && (!zi->ci.raw))
        {
          uLong uTotalOutBefore_lo = zi->ci.bstream.total_out_lo32;
/*          uLong uTotalOutBefore_hi = zi->ci.bstream.total_out_hi32; */
          err=BZ2_bzCompress(&zi->ci.bstream,  BZ_RUN);

          zi->ci.pos_in_buffered_data += (uInt)(zi->ci.bstream.total_out_lo32 - uTotalOutBefore_lo) ;
        }
      }

      if(err == BZ_RUN_OK)
        err = ZIP_OK;
    }
    else
#endif
    {
      zi->ci.stream.next_in = buf;
      zi->ci.stream.avail_in = len;

      while ((err==ZIP_OK) && (zi->ci.stream.avail_in>0))
      {
          if (zi->ci.stream.avail_out == 0)
          {
              if (zip64FlushWriteBuffer(zi) == ZIP_ERRNO)
                  err = ZIP_ERRNO;
              zi->ci.stream.avail_out = (uInt)Z_BUFSIZE;
              zi->ci.stream.next_out = zi->ci.buffered_data;
          }


          if(err != ZIP_OK)
              break;

          if ((zi->ci.method == Z_DEFLATED) && (!zi->ci.raw))
          {
              uLong uTotalOutBefore = zi->ci.stream.total_out;
              err=deflate(&zi->ci.stream,  Z_NO_FLUSH);

              zi->ci.pos_in_buffered_data += (uInt)(zi->ci.stream.total_out - uTotalOutBefore) ;
          }
          else
          {
              uInt copy_this,i;
              if (zi->ci.stream.avail_in < zi->ci.stream.avail_out)
                  copy_this = zi->ci.stream.avail_in;
              else
                  copy_this = zi->ci.stream.avail_out;

              for (i = 0; i < copy_this; i++)
                  *(((char*)zi->ci.stream.next_out)+i) =
                      *(((const char*)zi->ci.stream.next_in)+i);
              {
                  zi->ci.stream.avail_in -= copy_this;
                  zi->ci.stream.avail_out-= copy_this;
                  zi->ci.stream.next_in+= copy_this;
                  zi->ci.stream.next_out+= copy_this;
                  zi->ci.stream.total_in+= copy_this;
                  zi->ci.stream.total_out+= copy_this;
                  zi->ci.pos_in_buffered_data += copy_this;
              }
          }
      }/* while(...) */
    }

    return err;
}

extern int ZEXPORT zipCloseFileInZipRaw(zipFile file, uLong uncompressed_size, uLong crc32) {
    return zipCloseFileInZipRaw64 (file, uncompressed_size, crc32);
}

extern int ZEXPORT zipCloseFileInZipRaw64(zipFile file, ZPOS64_T uncompressed_size, uLong crc32) {
    zip64_internal* zi;
    ZPOS64_T compressed_size;
    uLong invalidValue = 0xffffffff;
    unsigned datasize = 0;
    int err=ZIP_OK;

    if (file == NULL)
        return ZIP_PARAMERROR;
    zi = (zip64_internal*)file;

    if (zi->in_opened_file_inzip == 0)
        return ZIP_PARAMERROR;
    zi->ci.stream.avail_in = 0;

    if ((zi->ci.method == Z_DEFLATED) && (!zi->ci.raw))
                {
                        while (err==ZIP_OK)
                        {
                                uLong uTotalOutBefore;
                                if (zi->ci.stream.avail_out == 0)
                                {
                                        if (zip64FlushWriteBuffer(zi) == ZIP_ERRNO)
                                                err = ZIP_ERRNO;
                                        zi->ci.stream.avail_out = (uInt)Z_BUFSIZE;
                                        zi->ci.stream.next_out = zi->ci.buffered_data;
                                }
                                uTotalOutBefore = zi->ci.stream.total_out;
                                err=deflate(&zi->ci.stream,  Z_FINISH);
                                zi->ci.pos_in_buffered_data += (uInt)(zi->ci.stream.total_out - uTotalOutBefore) ;
                        }
                }
    else if ((zi->ci.method == Z_BZIP2ED) && (!zi->ci.raw))
    {
#ifdef HAVE_BZIP2
      err = BZ_FINISH_OK;
      while (err==BZ_FINISH_OK)
      {
        uLong uTotalOutBefore;
        if (zi->ci.bstream.avail_out == 0)
        {
          if (zip64FlushWriteBuffer(zi) == ZIP_ERRNO)
            err = ZIP_ERRNO;
          zi->ci.bstream.avail_out = (uInt)Z_BUFSIZE;
          zi->ci.bstream.next_out = (char*)zi->ci.buffered_data;
        }
        uTotalOutBefore = zi->ci.bstream.total_out_lo32;
        err=BZ2_bzCompress(&zi->ci.bstream,  BZ_FINISH);
        if(err == BZ_STREAM_END)
          err = Z_STREAM_END;

        zi->ci.pos_in_buffered_data += (uInt)(zi->ci.bstream.total_out_lo32 - uTotalOutBefore);
      }

      if(err == BZ_FINISH_OK)
        err = ZIP_OK;
#endif
    }

    if (err==Z_STREAM_END)
        err=ZIP_OK; /* this is normal */

    if ((zi->ci.pos_in_buffered_data>0) && (err==ZIP_OK))
                {
        if (zip64FlushWriteBuffer(zi)==ZIP_ERRNO)
            err = ZIP_ERRNO;
                }

    if ((zi->ci.method == Z_DEFLATED) && (!zi->ci.raw))
    {
        int tmp_err = deflateEnd(&zi->ci.stream);
        if (err == ZIP_OK)
            err = tmp_err;
        zi->ci.stream_initialised = 0;
    }
#ifdef HAVE_BZIP2
    else if((zi->ci.method == Z_BZIP2ED) && (!zi->ci.raw))
    {
      int tmperr = BZ2_bzCompressEnd(&zi->ci.bstream);
                        if (err==ZIP_OK)
                                err = tmperr;
                        zi->ci.stream_initialised = 0;
    }
#endif

    if (!zi->ci.raw)
    {
        crc32 = (uLong)zi->ci.crc32;
        uncompressed_size = zi->ci.totalUncompressedData;
    }
    compressed_size = zi->ci.totalCompressedData;

#    ifndef NOCRYPT
    compressed_size += zi->ci.crypt_header_size;
#    endif

    /* update Current Item crc and sizes, */
    if(compressed_size >= 0xffffffff || uncompressed_size >= 0xffffffff || zi->ci.pos_local_header >= 0xffffffff)
    {
      /*version Made by*/
      zip64local_putValue_inmemory(zi->ci.central_header+4,(uLong)45,2);
      /*version needed*/
      zip64local_putValue_inmemory(zi->ci.central_header+6,(uLong)45,2);

    }

    zip64local_putValue_inmemory(zi->ci.central_header+16,crc32,4); /*crc*/


    if(compressed_size >= 0xffffffff)
      zip64local_putValue_inmemory(zi->ci.central_header+20, invalidValue,4); /*compr size*/
    else
      zip64local_putValue_inmemory(zi->ci.central_header+20, compressed_size,4); /*compr size*/

    /* set internal file attributes field */
    if (zi->ci.stream.data_type == Z_ASCII)
        zip64local_putValue_inmemory(zi->ci.central_header+36,(uLong)Z_ASCII,2);

    if(uncompressed_size >= 0xffffffff)
      zip64local_putValue_inmemory(zi->ci.central_header+24, invalidValue,4); /*uncompr size*/
    else
      zip64local_putValue_inmemory(zi->ci.central_header+24, uncompressed_size,4); /*uncompr size*/

    /* Add ZIP64 extra info field for uncompressed size */
    if(uncompressed_size >= 0xffffffff)
      datasize += 8;

    /* Add ZIP64 extra info field for compressed size */
    if(compressed_size >= 0xffffffff)
      datasize += 8;

    /* Add ZIP64 extra info field for relative offset to local file header of current file */
    if(zi->ci.pos_local_header >= 0xffffffff)
      datasize += 8;

    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 */
      p += 2;
      zip64local_putValue_inmemory(p, datasize, 2); /* DataSize */
      p += 2;

      if(uncompressed_size >= 0xffffffff)
      {
        zip64local_putValue_inmemory(p, uncompressed_size, 8);
        p += 8;
      }

      if(compressed_size >= 0xffffffff)
      {
        zip64local_putValue_inmemory(p, compressed_size, 8);
        p += 8;
      }

      if(zi->ci.pos_local_header >= 0xffffffff)
      {
        zip64local_putValue_inmemory(p, zi->ci.pos_local_header, 8);
        p += 8;
      }

      /* Update how much extra free space we got in the memory buffer
      // and increase the centralheader size so the new ZIP64 fields are included
      // ( 4 below is the size of HeaderID and DataSize field ) */
      zi->ci.size_centralExtraFree -= datasize + 4;
      zi->ci.size_centralheader += datasize + 4;

      /* Update the extra info size field */
      zi->ci.size_centralExtra += datasize + 4;
      zip64local_putValue_inmemory(zi->ci.central_header+30,(uLong)zi->ci.size_centralExtra,2);
    }

    if (err==ZIP_OK)
        err = add_data_in_datablock(&zi->central_dir, zi->ci.central_header, (uLong)zi->ci.size_centralheader);

    free(zi->ci.central_header);

    if (err==ZIP_OK)
    {
        /* Update the LocalFileHeader with the new values. */

        ZPOS64_T cur_pos_inzip = ZTELL64(zi->z_filefunc,zi->filestream);

        if (ZSEEK64(zi->z_filefunc,zi->filestream, zi->ci.pos_local_header + 14,ZLIB_FILEFUNC_SEEK_SET)!=0)
            err = ZIP_ERRNO;

        if (err==ZIP_OK)
            err = zip64local_putValue(&zi->z_filefunc,zi->filestream,crc32,4); /* crc 32, unknown */

        if(uncompressed_size >= 0xffffffff || compressed_size >= 0xffffffff )
        {
          if(zi->ci.pos_zip64extrainfo > 0)
          {
            /* Update the size in the ZIP64 extended field. */
            if (ZSEEK64(zi->z_filefunc,zi->filestream, zi->ci.pos_zip64extrainfo + 4,ZLIB_FILEFUNC_SEEK_SET)!=0)
              err = ZIP_ERRNO;

            if (err==ZIP_OK) /* compressed size, unknown */
              err = zip64local_putValue(&zi->z_filefunc, zi->filestream, uncompressed_size, 8);

            if (err==ZIP_OK) /* uncompressed size, unknown */
              err = zip64local_putValue(&zi->z_filefunc, zi->filestream, compressed_size, 8);
          }
          else
              err = ZIP_BADZIPFILE; /* Caller passed zip64 = 0, so no room for zip64 info -> fatal */
        }
        else
        {
          if (err==ZIP_OK) /* compressed size, unknown */
              err = zip64local_putValue(&zi->z_filefunc,zi->filestream,compressed_size,4);

          if (err==ZIP_OK) /* uncompressed size, unknown */
              err = zip64local_putValue(&zi->z_filefunc,zi->filestream,uncompressed_size,4);
        }

        if (ZSEEK64(zi->z_filefunc,zi->filestream, cur_pos_inzip,ZLIB_FILEFUNC_SEEK_SET)!=0)
            err = ZIP_ERRNO;
    }

    zi->number_entry ++;
    zi->in_opened_file_inzip = 0;

    return err;
}

extern int ZEXPORT zipCloseFileInZip(zipFile file) {
    return zipCloseFileInZipRaw (file,0,0);
}

local int Write_Zip64EndOfCentralDirectoryLocator(zip64_internal* zi, ZPOS64_T zip64eocd_pos_inzip) {
  int err = ZIP_OK;
  ZPOS64_T pos = zip64eocd_pos_inzip - zi->add_position_when_writing_offset;

  err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)ZIP64ENDLOCHEADERMAGIC,4);

  /*num disks*/
    if (err==ZIP_OK) /* number of the disk with the start of the central directory */
      err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)0,4);

  /*relative offset*/
    if (err==ZIP_OK) /* Relative offset to the Zip64EndOfCentralDirectory */
      err = zip64local_putValue(&zi->z_filefunc,zi->filestream, pos,8);

  /*total disks*/ /* Do not support spawning of disk so always say 1 here*/
    if (err==ZIP_OK) /* number of the disk with the start of the central directory */
      err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)1,4);

    return err;
}

local int Write_Zip64EndOfCentralDirectoryRecord(zip64_internal* zi, uLong size_centraldir, ZPOS64_T centraldir_pos_inzip) {
  int err = ZIP_OK;

  uLong Zip64DataSize = 44;

  err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)ZIP64ENDHEADERMAGIC,4);

  if (err==ZIP_OK) /* size of this 'zip64 end of central directory' */
    err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(ZPOS64_T)Zip64DataSize,8); /* why ZPOS64_T of this ? */

  if (err==ZIP_OK) /* version made by */
    err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)45,2);

  if (err==ZIP_OK) /* version needed */
    err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)45,2);

  if (err==ZIP_OK) /* number of this disk */
    err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)0,4);

  if (err==ZIP_OK) /* number of the disk with the start of the central directory */
    err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)0,4);

  if (err==ZIP_OK) /* total number of entries in the central dir on this disk */
    err = zip64local_putValue(&zi->z_filefunc, zi->filestream, zi->number_entry, 8);

  if (err==ZIP_OK) /* total number of entries in the central dir */
    err = zip64local_putValue(&zi->z_filefunc, zi->filestream, zi->number_entry, 8);

  if (err==ZIP_OK) /* size of the central directory */
    err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(ZPOS64_T)size_centraldir,8);

  if (err==ZIP_OK) /* offset of start of central directory with respect to the starting disk number */
  {
    ZPOS64_T pos = centraldir_pos_inzip - zi->add_position_when_writing_offset;
    err = zip64local_putValue(&zi->z_filefunc,zi->filestream, (ZPOS64_T)pos,8);
  }
  return err;
}

local int Write_EndOfCentralDirectoryRecord(zip64_internal* zi, uLong size_centraldir, ZPOS64_T centraldir_pos_inzip) {
  int err = ZIP_OK;

  /*signature*/
  err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)ENDHEADERMAGIC,4);

  if (err==ZIP_OK) /* number of this disk */
    err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)0,2);

  if (err==ZIP_OK) /* number of the disk with the start of the central directory */
    err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)0,2);

  if (err==ZIP_OK) /* total number of entries in the central dir on this disk */
  {
    {
      if(zi->number_entry >= 0xFFFF)
        err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)0xffff,2); /* use value in ZIP64 record */
      else
        err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)zi->number_entry,2);
    }
  }

  if (err==ZIP_OK) /* total number of entries in the central dir */
  {
    if(zi->number_entry >= 0xFFFF)
      err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)0xffff,2); /* use value in ZIP64 record */
    else
      err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)zi->number_entry,2);
  }

  if (err==ZIP_OK) /* size of the central directory */
    err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)size_centraldir,4);

  if (err==ZIP_OK) /* offset of start of central directory with respect to the starting disk number */
  {
    ZPOS64_T pos = centraldir_pos_inzip - zi->add_position_when_writing_offset;
    if(pos >= 0xffffffff)
    {
      err = zip64local_putValue(&zi->z_filefunc,zi->filestream, (uLong)0xffffffff,4);
    }
    else
      err = zip64local_putValue(&zi->z_filefunc,zi->filestream, (uLong)(centraldir_pos_inzip - zi->add_position_when_writing_offset),4);
  }

   return err;
}

local int Write_GlobalComment(zip64_internal* zi, const char* global_comment) {
  int err = ZIP_OK;
  uInt size_global_comment = 0;

  if(global_comment != NULL)
    size_global_comment = (uInt)strlen(global_comment);

  err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)size_global_comment,2);

  if (err == ZIP_OK && size_global_comment > 0)
  {
    if (ZWRITE64(zi->z_filefunc,zi->filestream, global_comment, size_global_comment) != size_global_comment)
      err = ZIP_ERRNO;
  }
  return err;
}

extern int ZEXPORT zipClose(zipFile file, const char* global_comment) {
    zip64_internal* zi;
    int err = 0;
    uLong size_centraldir = 0;
    ZPOS64_T centraldir_pos_inzip;
    ZPOS64_T pos;

    if (file == NULL)
        return ZIP_PARAMERROR;

    zi = (zip64_internal*)file;

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

#ifndef NO_ADDFILEINEXISTINGZIP
    if (global_comment==NULL)
        global_comment = zi->globalcomment;
#endif

    centraldir_pos_inzip = ZTELL64(zi->z_filefunc,zi->filestream);

    if (err==ZIP_OK)
    {
        linkedlist_datablock_internal* ldi = zi->central_dir.first_block;
        while (ldi!=NULL)
        {
            if ((err==ZIP_OK) && (ldi->filled_in_this_block>0))
            {
                if (ZWRITE64(zi->z_filefunc,zi->filestream, ldi->data, ldi->filled_in_this_block) != ldi->filled_in_this_block)
                    err = ZIP_ERRNO;
            }

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

    set_end(&zi->set);          /* set was zeroed, so this is safe */

    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);
    }

    if (err==ZIP_OK)
      err = Write_EndOfCentralDirectoryRecord(zi, size_centraldir, centraldir_pos_inzip);

    if(err == ZIP_OK)
      err = Write_GlobalComment(zi, global_comment);

    if (ZCLOSE64(zi->z_filefunc,zi->filestream) != 0)
        if (err == ZIP_OK)
            err = ZIP_ERRNO;

#ifndef NO_ADDFILEINEXISTINGZIP
    free(zi->globalcomment);
#endif
    free(zi);

    return err;
}

extern int ZEXPORT zipRemoveExtraInfoBlock(char* pData, int* dataLen, short sHeader) {
  char* p = pData;
  int size = 0;
  char* pNewHeader;
  char* pTmp;
  short header;
  short dataSize;

  int retVal = ZIP_OK;

  if(pData == NULL || dataLen == NULL || *dataLen < 4)
    return ZIP_PARAMERROR;

  pNewHeader = (char*)ALLOC((unsigned)*dataLen);
  pTmp = pNewHeader;

  while(p < (pData + *dataLen))
  {
    header = *(short*)p;
    dataSize = *(((short*)p)+1);

    if( header == sHeader ) /* Header found. */
    {
      p += dataSize + 4; /* skip it. do not copy to temp buffer */
    }
    else
    {
      /* Extra Info block should not be removed, So copy it to the temp buffer. */
      memcpy(pTmp, p, dataSize + 4);
      p += dataSize + 4;
      size += dataSize + 4;
    }

  }

  if(size < *dataLen)
  {
    /* clean old extra info block. */
    memset(pData,0, *dataLen);

    /* copy the new extra info block over the old */
    if(size > 0)
      memcpy(pData, pNewHeader, size);

    /* set the new extra info size */
    *dataLen = size;

    retVal = ZIP_OK;
  }
  else
    retVal = ZIP_ERRNO;

  free(pNewHeader);

  return retVal;
}
