This section of the archives stores flipcode's complete Developer Toolbox collection, featuring a variety of mini-articles and source code contributions from our readers.

| Iostream Library for Accessing Zip-Files Submitted by

this is a small library letting you access .zip files as standard c++ iostreams (zlib is needed to build it). both zipping and unzipping work. in text mode line feed translation is done correctly under windows. the interface is that of the standard c++ streams and not the prestandard version. a small example demonstrating the usage is also provided in the ZipTest project. the library can also be downloaded at www.chengine.com ciao,
gottfried

Currently browsing [compression_0_1.zip] (31,945 bytes) - [Compression/Zip/izipbuf.h] - (1,987 bytes)

    //------------------------------------------------------------------------------
    // (c) 2001 Gottfried Chen
    //------------------------------------------------------------------------------

    #ifndef IZIPBUF_H
    #define IZIPBUF_H

    #include "izipfile.h"
    #include <streambuf>

    namespace zip
    {

    // ATTENTION: Only one concurrent open file possible -> synchronize via a static variable

    template<class Character, class Traits = std::char_traits<Character> >
    class basic_izipbuf : public std::basic_streambuf<Character, Traits>
    {
    public:
        enum
        {
            BUFFER_SIZE = 100,
            PUT_BACK_SIZE = 10
        };

        basic_izipbuf();
        // Open <fileName> in <zip>
        basic_izipbuf(izipfile& zip, const char* fileName,
            std::ios_base::openmode);

        virtual ~basic_izipbuf();

        // Open <fileName> in <zip>. Returns <this> if succesful otherwise 0.
        basic_izipbuf* open(izipfile& zip, const char* fileName,
                            std::ios_base::openmode);
        // If is_open, close the file and return <this>, otherwise 0.
        basic_izipbuf* close();
        // Returns false, if the file couldn't be opened
        bool is_open();

    protected:
        virtual int_type pbackfail(int_type character);
        virtual int_type underflow();
        // ToDo: Optimize it for binary files.
        virtual std::streamsize xsgetn(char_type* buffer, std::streamsize size);

    private:
        // Translates "\r\n" to '\n'
        static inline
        unsigned int toTextMode(char* buffer, unsigned int size);

        basic_izipbuf(const basic_izipbuf&);
        basic_izipbuf& operator=(const basic_izipbuf&);

        int fillReadBuffer();

        bool mOpen;
        izipfile* mFile;
        char_type mReadBuffer[BUFFER_SIZE];
        bool mBinary;
    };

    typedef basic_izipbuf<char> izipbuf;

    // Attention: No multibyte to wide character translation is done on input.
    typedef basic_izipbuf<wchar_t> wizipbuf;

    } // namespace zip

    #include "izipbuf.inl"
    #endif // IZIPBUF_H

Currently browsing [compression_0_1.zip] (31,945 bytes) - [Compression/Zip/izipfile.cpp] - (3,377 bytes)

    //------------------------------------------------------------------------------
    // (c) 2001 Gottfried Chen
    //------------------------------------------------------------------------------

    #include "izipfile.h"

    namespace zip
    {

    //------------------------------------------------------------------------------
    izipfile::izipfile(const char* fileName) :
    //------------------------------------------------------------------------------
    mHandle(0),
    mFileInZipIsOpen(false)
    {
        mHandle = unzOpen(fileName);
    }

    //------------------------------------------------------------------------------
    bool izipfile::isOk() const
    //------------------------------------------------------------------------------
    {
        return mHandle != 0;
    }

    //------------------------------------------------------------------------------
    izipfile::~izipfile()
    //------------------------------------------------------------------------------
    {
        close();
    }

    //------------------------------------------------------------------------------
    bool izipfile::close()
    //------------------------------------------------------------------------------
    {
        bool ret = false;
        closeInZip();
        if (isOk())
        {
            ret = unzClose(mHandle) == UNZ_OK;
            mHandle = 0;
        }

        return ret;
    }

    //------------------------------------------------------------------------------
    bool izipfile::fileInZipIsOpen() const
    //------------------------------------------------------------------------------
    {
        return mFileInZipIsOpen;
    }

    //------------------------------------------------------------------------------
    bool izipfile::openInZip(const char* fileName)
    //------------------------------------------------------------------------------
    {
        bool ret = false;
        if (isOk() &&
            !fileInZipIsOpen() &&
            unzLocateFile(mHandle, fileName, 0) == UNZ_OK &&
            unzOpenCurrentFile(mHandle) == UNZ_OK)
        {
            mFileInZipIsOpen = true;
            ret = true;
        }

        return ret;
    }

    //------------------------------------------------------------------------------
    bool izipfile::closeInZip()
    //------------------------------------------------------------------------------
    {
        bool ret = false;
        if (mFileInZipIsOpen)
        {
            mFileInZipIsOpen = false;
            ret = unzCloseCurrentFile(mHandle) == UNZ_OK;
        }

        return ret;
    }

    //------------------------------------------------------------------------------
    int izipfile::read(void* buffer, unsigned int size)
    //------------------------------------------------------------------------------
    {
        if (fileInZipIsOpen())
            return unzReadCurrentFile(mHandle, buffer, size);
        else
            return -1;
    }

    //------------------------------------------------------------------------------
    izipfile::izipfile(izipfile& rhs)
    //------------------------------------------------------------------------------
    {
        *this = rhs;
    }

    //------------------------------------------------------------------------------
    izipfile& izipfile::operator=(izipfile& rhs)
    //------------------------------------------------------------------------------
    {
        mHandle = rhs.mHandle;
        mFileInZipIsOpen = rhs.mFileInZipIsOpen;

        rhs.mHandle = 0;
        rhs.mFileInZipIsOpen = false;

        return *this;
    }

    } // namespace zip

Currently browsing [compression_0_1.zip] (31,945 bytes) - [Compression/Zip/izipfile.h] - (1,076 bytes)

    //------------------------------------------------------------------------------
    // (c) 2001 Gottfried Chen
    //------------------------------------------------------------------------------

    #ifndef IZIPFILE_H
    #define IZIPFILE_H

    #include "unzip.h"

    namespace zip
    {

    class izipfile
    {
    public:
        // Con/Destruction
        izipfile(const char* fileName);
        // Ownership is reassigned on copying. I.e.: <rhs> will be invalid afterwards.
        izipfile(izipfile& rhs);
        izipfile& operator=(izipfile& rhs);
        ~izipfile();

        // Close the .zip file.
        bool close();
        // Was opening the file succesful?
        bool isOk() const;

        // Open/Close a file in the .zip. Only one file can be open at
        // a time.
        bool openInZip(const char* fileName);
        bool closeInZip();

        // Returns number of read bytes or a negative number on error.
        int read(void* buffer, unsigned int size);

    private:
        bool fileInZipIsOpen() const;

        unzFile mHandle;
        bool mFileInZipIsOpen;
    };

    } // namespace zip

    #endif // IZIPFILE_H

Currently browsing [compression_0_1.zip] (31,945 bytes) - [Compression/Zip/izipstream.h] - (1,010 bytes)

    //------------------------------------------------------------------------------
    // (c) 2001 Gottfried Chen
    //------------------------------------------------------------------------------

    #ifndef IZIPSTREAM_H
    #define IZIPSTREAM_H

    #include "izipbuf.h"

    namespace zip
    {

    template<class Character, class Traits = std::char_traits<Character> >
    class basic_izipstream : public std::basic_istream<Character, Traits>
    {
    public:
        basic_izipstream(izipfile& zip, const char* fileName,
                         std::ios_base::openmode = std::ios_base::in);

        void open(izipfile& zip, const char* fileName,
                  std::ios_base::openmode = std::ios_base::in);
        void close();

    private:
        basic_izipbuf<Character, Traits> mBuffer;
    };

    typedef basic_izipstream<char> izipstream;

    // Attention: No multibyte to wide character translation is done on input.
    typedef basic_izipstream<wchar_t> wizipstream;

    } // namespace zip

    #include "izipstream.inl"
    #endif // IZIPSTREAM_H

Currently browsing [compression_0_1.zip] (31,945 bytes) - [Compression/Zip/ozipbuf.h] - (1,951 bytes)

    //------------------------------------------------------------------------------
    // (c) 2001 Gottfried Chen
    //------------------------------------------------------------------------------

    #ifndef OZIPBUF_H
    #define OZIPBUF_H

    #include "ozipfile.h"
    #include <streambuf>

    namespace zip
    {

    template<class Character, class Traits = std::char_traits<Character> >
    class basic_ozipbuf : public std::streambuf
    {
    public:
        enum
        {
            BUFFER_SIZE = 100
        };

        basic_ozipbuf();
        // Open <fileName> in <zip>
        basic_ozipbuf(ozipfile& zip, const char* fileName,
            std::ios_base::openmode = std::ios_base::out | std::ios_base::trunc);

        virtual ~basic_ozipbuf();

        // Open <fileName> in <zip>. Returns <this> if succesful otherwise 0.
        basic_ozipbuf* open(ozipfile& zip, const char* fileName,
                            std::ios_base::openmode);
        // If is_open, close the file and return <this>, otherwise 0.
        basic_ozipbuf* close();
        // Returns false, if the file couldn't be opened
        bool is_open();

    protected:
        virtual int_type overflow(int_type c = traits_type::eof());
        virtual int sync();
        // ToDo: implement
        //virtual std::streamsize xsputn(char_type* buffer, std::streamsize size);

    private:
        // Translates '\n' to "\r\n"
        static inline
        unsigned int toFileMode(char* buffer, unsigned int size);

        basic_ozipbuf(const basic_ozipbuf&);
        basic_ozipbuf& operator=(const basic_ozipbuf&);

        bool flushWriteBuffer(int_type);

        bool mOpen;
        // Need double size for worst case text mode translation
        char_type mWriteBuffer[2*BUFFER_SIZE];
        bool mBinary;
        ozipfile* mFile;
    };

    typedef basic_ozipbuf<char> ozipbuf;

    // Attention: No wide to multibyte character translation is done on output.
    typedef basic_ozipbuf<wchar_t> wozipbuf;

    } // namespace zip

    #include "ozipbuf.inl"

    #endif // OZIPBUF_H

Currently browsing [compression_0_1.zip] (31,945 bytes) - [Compression/Zip/ozipfile.cpp] - (4,077 bytes)

    //------------------------------------------------------------------------------
    // (c) 2001 Gottfried Chen
    //------------------------------------------------------------------------------

    #include "ozipfile.h"
    #include <time.h>

    namespace zip
    {

    //------------------------------------------------------------------------------
    ozipfile::ozipfile(const char* fileName) :
    //------------------------------------------------------------------------------
    mFileInZipIsOpen(false)
    {
        mHandle = zipOpen(fileName, 0);
    }

    //------------------------------------------------------------------------------
    ozipfile::~ozipfile()
    //------------------------------------------------------------------------------
    {
        close();
    }

    //------------------------------------------------------------------------------
    bool ozipfile::close()
    //------------------------------------------------------------------------------
    {
        bool ret = false;
        closeInZip();
        if (isOk())
        {
            ret = zipClose(mHandle, 0) == ZIP_OK;
            mHandle = 0;
        }

        return ret;
    }

    //------------------------------------------------------------------------------
    bool ozipfile::isOk() const
    //------------------------------------------------------------------------------
    {
        return mHandle != 0;
    }

    //------------------------------------------------------------------------------
    bool ozipfile::openInZip(const char* fileName)
    //------------------------------------------------------------------------------
    {
        bool ret = false;
        if (isOk() && !mFileInZipIsOpen)
        {
            // The file attributes were found out - by reading the attributes of
            // existing .zip files - to be 0x0 for internal and
            // 0x20 for external attributes. (These are the normal settings for
            // a read/write, visible file in a .zip)
            zip_fileinfo info = { 0 };
            info.external_fa = 0x20;

            // Set creation time.
            time_t sec;
            time(&sec);
            tm* local = localtime(&sec);
            info.tmz_date.tm_sec = local->tm_sec;
            info.tmz_date.tm_min = local->tm_min;
            info.tmz_date.tm_hour = local->tm_hour;
            info.tmz_date.tm_mday = local->tm_mday;
            info.tmz_date.tm_mon = local->tm_mon;
            info.tmz_date.tm_year = local->tm_year;

            if (zipOpenNewFileInZip(mHandle, fileName, &info,
                                    0, 0, 0, 0, 0,
                                    Z_DEFLATED, Z_DEFAULT_COMPRESSION) == ZIP_OK)
            {
                mFileInZipIsOpen = true;
                ret = true;
            }
        }

        return ret;
    }

    //------------------------------------------------------------------------------
    bool ozipfile::closeInZip()
    //------------------------------------------------------------------------------
    {
        bool ret = false;
        if (mFileInZipIsOpen)
        {
            mFileInZipIsOpen = false;
            ret = zipCloseFileInZip(mHandle) == ZIP_OK;
        }

        return ret;
    }

    //------------------------------------------------------------------------------
    bool ozipfile::write(void* buffer, unsigned int size)
    //------------------------------------------------------------------------------
    {
        bool ret = false;
        if (mFileInZipIsOpen)
        {
            ret = zipWriteInFileInZip(mHandle,
                                      const_cast<char*>(buffer), size) == ZIP_OK;
        }

        return ret;
    }

    //------------------------------------------------------------------------------
    ozipfile::ozipfile(ozipfile& rhs)
    //------------------------------------------------------------------------------
    {
        *this = rhs;
    }

    //------------------------------------------------------------------------------
    ozipfile& ozipfile::operator=(ozipfile& rhs)
    //------------------------------------------------------------------------------
    {
        mHandle = rhs.mHandle;
        mFileInZipIsOpen = rhs.mFileInZipIsOpen;

        rhs.mHandle = 0;
        rhs.mFileInZipIsOpen = false;

        return *this;
    }

    } // namespace zip

Currently browsing [compression_0_1.zip] (31,945 bytes) - [Compression/Zip/ozipfile.h] - (1,020 bytes)

    //------------------------------------------------------------------------------
    // (c) 2001 Gottfried Chen
    //------------------------------------------------------------------------------

    #ifndef OZIPFILE_H
    #define OZIPFILE_H

    #include "zip.h"

    namespace zip
    {

    class ozipfile
    {
    public:
        // Con/Destruction
        ozipfile(const char* fileName);
        // Ownership is reassigned on copying. I.e.: <rhs> will be invalid afterwards.
        ozipfile(ozipfile& rhs);
        ozipfile& operator=(ozipfile& rhs);
        ~ozipfile();

        // Close the .zip file.
        bool close();
        // Returns true if the .zip is open and ok.
        bool isOk() const;

        // Open/Close a file in the .zip. Only one file can be open at
        // a time.
        bool openInZip(const char* fileName);
        bool closeInZip();

        // Returns false if an error occured.
        bool write(void* buffer, unsigned int size);

    private:
        zipFile mHandle;
        bool mFileInZipIsOpen;
    };

    } // namespace zip

    #endif OZIPFILE_H

Currently browsing [compression_0_1.zip] (31,945 bytes) - [Compression/Zip/ozipstream.h] - (1,059 bytes)

    //------------------------------------------------------------------------------
    // (c) 2001 Gottfried Chen
    //------------------------------------------------------------------------------

    #ifndef OZIPSTREAM_H
    #define OZIPSTREAM_H

    #include "ozipbuf.h"

    namespace zip
    {

    template<class Character, class Traits = std::char_traits<Character> >
    class basic_ozipstream : public std::basic_ostream<Character, Traits>
    {
    public:
        basic_ozipstream(ozipfile& zip, const char* fileName,
                         std::ios_base::openmode = std::ios_base::out | std::ios_base::trunc);

        void open(ozipfile& zip, const char* fileName,
                  std::ios_base::openmode = std::ios_base::out | std::ios_base::trunc);
        void close();

    private:
        basic_ozipbuf<Character, Traits> mBuffer;
    };

    typedef basic_ozipstream<char> ozipstream;

    // Attention: No wide to multibyte character translation is done on output.
    typedef basic_ozipstream<wchar_t> wozipstream;

    } // namespace zip

    #include "ozipstream.inl"
    #endif // OZIPSTREAM_H

Currently browsing [compression_0_1.zip] (31,945 bytes) - [Compression/Zip/unzip.c] - (35,835 bytes)

    /* unzip.c -- IO on .zip files using zlib
       Version 0.15 beta, Mar 19th, 1998,

       Read unzip.h for more info
    */

    #include <stdio.h>
    #include <stdlib.h>
    #include <string.h>
    #include "zlib.h"
    #include "unzip.h"

    #ifdef STDC
    #  include <stddef.h>
    #  include <string.h>
    #  include <stdlib.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 */

    #if !defined(unix) && !defined(CASESENSITIVITYDEFAULT_YES) && \
                          !defined(CASESENSITIVITYDEFAULT_NO)
    #define CASESENSITIVITYDEFAULT_NO
    #endif

    #ifndef UNZ_BUFSIZE
    #define UNZ_BUFSIZE (16384)
    #endif

    #ifndef UNZ_MAXFILENAMEINZIP
    #define UNZ_MAXFILENAMEINZIP (256)
    #endif

    #ifndef ALLOC
    # define ALLOC(size) (malloc(size))
    #endif
    #ifndef TRYFREE
    # define TRYFREE(p) {if (p) free(p);}
    #endif

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

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

    #ifndef SEEK_CUR
    #define SEEK_CUR    1
    #endif

    #ifndef SEEK_END
    #define SEEK_END    2
    #endif

    #ifndef SEEK_SET
    #define SEEK_SET    0
    #endif

    const char unz_copyright[] =
       " unzip 0.15 Copyright 1998 Gilles Vollant ";

    /* unz_file_info_interntal contain internal info about a file in zipfile*/
    typedef struct unz_file_info_internal_s
    {
        uLong offset_curfile;/* relative offset of local header 4 bytes */
    } unz_file_info_internal;

    /* file_in_zip_read_info_s contain internal information about a file in zipfile,
        when reading and decompress it */
    typedef struct
    {
    	char  *read_buffer;         /* internal buffer for compressed data */
    	z_stream stream;            /* zLib stream structure for inflate */

    	uLong pos_in_zipfile;       /* position in byte on the zipfile, for fseek*/
    	uLong stream_initialised;   /* flag set if stream structure is initialised*/

    	uLong offset_local_extrafield;/* offset of the local extra field */
    	uInt  size_local_extrafield;/* size of the local extra field */
    	uLong pos_local_extrafield;   /* position in the local extra field in read*/

    	uLong crc32;                /* crc32 of all data uncompressed */
    	uLong crc32_wait;           /* crc32 we must obtain after decompress all */
    	uLong rest_read_compressed; /* number of byte to be decompressed */
    	uLong rest_read_uncompressed;/*number of byte to be obtained after decomp*/
    	FILE* file;                 /* io structore of the zipfile */
    	uLong compression_method;   /* compression method (0==store) */
    	uLong byte_before_the_zipfile;/* byte before the zipfile, (>0 for sfx)*/
    } file_in_zip_read_info_s;

    /* unz_s contain internal information about the zipfile
    */
    typedef struct
    {
    	FILE* file;                 /* io structore of the zipfile */
    	unz_global_info gi;       /* public global information */
    	uLong byte_before_the_zipfile;/* byte before the zipfile, (>0 for sfx)*/
    	uLong num_file;             /* number of the current file in the zipfile*/
    	uLong pos_in_central_dir;   /* pos of the current file in the central dir*/
    	uLong current_file_ok;      /* flag about the usability of the current file*/
    	uLong central_pos;          /* position of the beginning of the central dir*/

    	uLong size_central_dir;     /* size of the central directory  */
    	uLong offset_central_dir;   /* offset of start of central directory with
    								   respect to the starting disk number */

    	unz_file_info cur_file_info; /* public info about the current file in zip*/
    	unz_file_info_internal cur_file_info_internal; /* private info about it*/
        file_in_zip_read_info_s* pfile_in_zip_read; /* structure about the current
    	                                    file if we are decompressing it */
    } unz_s;

    /* ===========================================================================
         Read a byte from a gz_stream; update next_in and avail_in. Return EOF
       for end of file.
       IN assertion: the stream s has been sucessfully opened for reading.
    */

    local int unzlocal_getByte(fin,pi)
    	FILE *fin;
    	int *pi;
    {
        unsigned char c;
    	int err = fread(&c, 1, 1, fin);
        if (err==1)
        {
            *pi = (int)c;
            return UNZ_OK;
        }
        else
        {
            if (ferror(fin))
                return UNZ_ERRNO;
            else
                return UNZ_EOF;
        }
    }

    /* ===========================================================================
       Reads a long in LSB order from the given gz_stream. Sets
    */
    local int unzlocal_getShort (fin,pX)
    	FILE* fin;
        uLong *pX;
    {
        uLong x ;
        int i;
        int err;

        err = unzlocal_getByte(fin,&i);
        x = (uLong)i;

        if (err==UNZ_OK)
            err = unzlocal_getByte(fin,&i);
        x += ((uLong)i)<<8;

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

    local int unzlocal_getLong (fin,pX)
    	FILE* fin;
        uLong *pX;
    {
        uLong x ;
        int i;
        int err;

        err = unzlocal_getByte(fin,&i);
        x = (uLong)i;

        if (err==UNZ_OK)
            err = unzlocal_getByte(fin,&i);
        x += ((uLong)i)<<8;

        if (err==UNZ_OK)
            err = unzlocal_getByte(fin,&i);
        x += ((uLong)i)<<16;

        if (err==UNZ_OK)
            err = unzlocal_getByte(fin,&i);
        x += ((uLong)i)<<24;

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

    /* My own strcmpi / strcasecmp */
    local int strcmpcasenosensitive_internal (fileName1,fileName2)
    	const char* fileName1;
    	const char* fileName2;
    {
    	for (;;)
    	{
    		char c1=*(fileName1++);
    		char c2=*(fileName2++);
    		if ((c1>='a') && (c1<='z'))
    			c1 -= 0x20;
    		if ((c2>='a') && (c2<='z'))
    			c2 -= 0x20;
    		if (c1=='\0')
    			return ((c2=='\0') ? 0 : -1);
    		if (c2=='\0')
    			return 1;
    		if (c1<c2)
    			return -1;
    		if (c1>c2)
    			return 1;
    	}
    }

    #ifdef  CASESENSITIVITYDEFAULT_NO
    #define CASESENSITIVITYDEFAULTVALUE 2
    #else
    #define CASESENSITIVITYDEFAULTVALUE 1
    #endif

    #ifndef STRCMPCASENOSENTIVEFUNCTION
    #define STRCMPCASENOSENTIVEFUNCTION strcmpcasenosensitive_internal
    #endif

    /*
       Compare two filename (fileName1,fileName2).
       If iCaseSenisivity = 1, comparision is case sensitivity (like strcmp)
       If iCaseSenisivity = 2, comparision is not case sensitivity (like strcmpi
                                                                    or strcasecmp)
       If iCaseSenisivity = 0, case sensitivity is defaut of your operating system
            (like 1 on Unix, 2 on Windows)

    */
    extern int ZEXPORT unzStringFileNameCompare (fileName1,fileName2,iCaseSensitivity)
    	const char* fileName1;
    	const char* fileName2;
    	int iCaseSensitivity;
    {
    	if (iCaseSensitivity==0)
    		iCaseSensitivity=CASESENSITIVITYDEFAULTVALUE;

    	if (iCaseSensitivity==1)
    		return strcmp(fileName1,fileName2);

    	return STRCMPCASENOSENTIVEFUNCTION(fileName1,fileName2);
    }

    #define BUFREADCOMMENT (0x400)

    /*
      Locate the Central directory of a zipfile (at the end, just before
        the global comment)
    */
    local uLong unzlocal_SearchCentralDir(fin)
    	FILE *fin;
    {
    	unsigned char* buf;
    	uLong uSizeFile;
    	uLong uBackRead;
    	uLong uMaxBack=0xffff; /* maximum size of global comment */
    	uLong uPosFound=0;

    	if (fseek(fin,0,SEEK_END) != 0)
    		return 0;

    	uSizeFile = ftell( fin );

    	if (uMaxBack>uSizeFile)
    		uMaxBack = uSizeFile;

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

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

    		uReadSize = ((BUFREADCOMMENT+4) < (uSizeFile-uReadPos)) ?
                         (BUFREADCOMMENT+4) : (uSizeFile-uReadPos);
    		if (fseek(fin,uReadPos,SEEK_SET)!=0)
    			break;

    		if (fread(buf,(uInt)uReadSize,1,fin)!=1)
    			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+i;
    				break;
    			}

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

    /*
      Open a Zip file. path contain the full pathname (by example,
         on a Windows NT computer "c:\\test\\zlib109.zip" or on an Unix computer
    	 "zlib/zlib109.zip".
    	 If the zipfile cannot be opened (file don't exist or in not valid), the
    	   return value is NULL.
         Else, the return value is a unzFile Handle, usable with other function
    	   of this unzip package.
    */
    extern unzFile ZEXPORT unzOpen (path)
    	const char *path;
    {
    	unz_s us;
    	unz_s *s;
    	uLong central_pos,uL;
    	FILE * fin ;

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

    	int err=UNZ_OK;

        if (unz_copyright[0]!=' ')
            return NULL;

        fin=fopen(path,"rb");
    	if (fin==NULL)
    		return NULL;

    	central_pos = unzlocal_SearchCentralDir(fin);
    	if (central_pos==0)
    		err=UNZ_ERRNO;

    	if (fseek(fin,central_pos,SEEK_SET)!=0)
    		err=UNZ_ERRNO;

    	/* the signature, already checked */
    	if (unzlocal_getLong(fin,&uL)!=UNZ_OK)
    		err=UNZ_ERRNO;

    	/* number of this disk */
    	if (unzlocal_getShort(fin,&number_disk)!=UNZ_OK)
    		err=UNZ_ERRNO;

    	/* number of the disk with the start of the central directory */
    	if (unzlocal_getShort(fin,&number_disk_with_CD)!=UNZ_OK)
    		err=UNZ_ERRNO;

    	/* total number of entries in the central dir on this disk */
    	if (unzlocal_getShort(fin,&us.gi.number_entry)!=UNZ_OK)
    		err=UNZ_ERRNO;

    	/* total number of entries in the central dir */
    	if (unzlocal_getShort(fin,&number_entry_CD)!=UNZ_OK)
    		err=UNZ_ERRNO;

    	if ((number_entry_CD!=us.gi.number_entry) ||
    		(number_disk_with_CD!=0) ||
    		(number_disk!=0))
    		err=UNZ_BADZIPFILE;

    	/* size of the central directory */
    	if (unzlocal_getLong(fin,&us.size_central_dir)!=UNZ_OK)
    		err=UNZ_ERRNO;

    	/* offset of start of central directory with respect to the
    	      starting disk number */
    	if (unzlocal_getLong(fin,&us.offset_central_dir)!=UNZ_OK)
    		err=UNZ_ERRNO;

    	/* zipfile comment length */
    	if (unzlocal_getShort(fin,&us.gi.size_comment)!=UNZ_OK)
    		err=UNZ_ERRNO;

    	if ((central_pos<us.offset_central_dir+us.size_central_dir) &&
    		(err==UNZ_OK))
    		err=UNZ_BADZIPFILE;

    	if (err!=UNZ_OK)
    	{
    		fclose(fin);
    		return NULL;
    	}

    	us.file=fin;
    	us.byte_before_the_zipfile = central_pos -
    		                    (us.offset_central_dir+us.size_central_dir);
    	us.central_pos = central_pos;
        us.pfile_in_zip_read = NULL;

    	s=(unz_s*)ALLOC(sizeof(unz_s));
    	*s=us;
    	unzGoToFirstFile((unzFile)s);
    	return (unzFile)s;
    }

    /*
      Close a ZipFile opened with unzipOpen.
      If there is files inside the .Zip opened with unzipOpenCurrentFile (see later),
        these files MUST be closed with unzipCloseCurrentFile before call unzipClose.
      return UNZ_OK if there is no problem. */
    extern int ZEXPORT unzClose (file)
    	unzFile file;
    {
    	unz_s* s;
    	if (file==NULL)
    		return UNZ_PARAMERROR;
    	s=(unz_s*)file;

        if (s->pfile_in_zip_read!=NULL)
            unzCloseCurrentFile(file);

    	fclose(s->file);
    	TRYFREE(s);
    	return UNZ_OK;
    }

    /*
      Write info about the ZipFile in the *pglobal_info structure.
      No preparation of the structure is needed
      return UNZ_OK if there is no problem. */
    extern int ZEXPORT unzGetGlobalInfo (file,pglobal_info)
    	unzFile file;
    	unz_global_info *pglobal_info;
    {
    	unz_s* s;
    	if (file==NULL)
    		return UNZ_PARAMERROR;
    	s=(unz_s*)file;
    	*pglobal_info=s->gi;
    	return UNZ_OK;
    }

    /*
       Translate date/time from Dos format to tm_unz (readable more easilty)
    */
    local void unzlocal_DosDateToTmuDate (ulDosDate, ptm)
        uLong ulDosDate;
        tm_unz* ptm;
    {
        uLong uDate;
        uDate = (uLong)(ulDosDate>>16);
        ptm->tm_mday = (uInt)(uDate&0x1f) ;
        ptm->tm_mon =  (uInt)((((uDate)&0x1E0)/0x20)-1) ;
        ptm->tm_year = (uInt)(((uDate&0x0FE00)/0x0200)+1980) ;

        ptm->tm_hour = (uInt) ((ulDosDate &0xF800)/0x800);
        ptm->tm_min =  (uInt) ((ulDosDate&0x7E0)/0x20) ;
        ptm->tm_sec =  (uInt) (2*(ulDosDate&0x1f)) ;
    }

    /*
      Get Info about the current file in the zipfile, with internal only info
    */
    local int unzlocal_GetCurrentFileInfoInternal OF((unzFile file,
                                                      unz_file_info *pfile_info,
                                                      unz_file_info_internal
                                                      *pfile_info_internal,
                                                      char *szFileName,
    												  uLong fileNameBufferSize,
                                                      void *extraField,
    												  uLong extraFieldBufferSize,
                                                      char *szComment,
    												  uLong commentBufferSize));

    local int unzlocal_GetCurrentFileInfoInternal (file,
                                                  pfile_info,
                                                  pfile_info_internal,
                                                  szFileName, fileNameBufferSize,
                                                  extraField, extraFieldBufferSize,
                                                  szComment,  commentBufferSize)
    	unzFile file;
    	unz_file_info *pfile_info;
    	unz_file_info_internal *pfile_info_internal;
    	char *szFileName;
    	uLong fileNameBufferSize;
    	void *extraField;
    	uLong extraFieldBufferSize;
    	char *szComment;
    	uLong commentBufferSize;
    {
    	unz_s* s;
    	unz_file_info file_info;
    	unz_file_info_internal file_info_internal;
    	int err=UNZ_OK;
    	uLong uMagic;
    	long lSeek=0;

    	if (file==NULL)
    		return UNZ_PARAMERROR;
    	s=(unz_s*)file;
    	if (fseek(s->file,s->pos_in_central_dir+s->byte_before_the_zipfile,SEEK_SET)!=0)
    		err=UNZ_ERRNO;

    	/* we check the magic */
    	if (err==UNZ_OK)
    		if (unzlocal_getLong(s->file,&uMagic) != UNZ_OK)
    			err=UNZ_ERRNO;
    		else if (uMagic!=0x02014b50)
    			err=UNZ_BADZIPFILE;

    	if (unzlocal_getShort(s->file,&file_info.version) != UNZ_OK)
    		err=UNZ_ERRNO;

    	if (unzlocal_getShort(s->file,&file_info.version_needed) != UNZ_OK)
    		err=UNZ_ERRNO;

    	if (unzlocal_getShort(s->file,&file_info.flag) != UNZ_OK)
    		err=UNZ_ERRNO;

    	if (unzlocal_getShort(s->file,&file_info.compression_method) != UNZ_OK)
    		err=UNZ_ERRNO;

    	if (unzlocal_getLong(s->file,&file_info.dosDate) != UNZ_OK)
    		err=UNZ_ERRNO;

        unzlocal_DosDateToTmuDate(file_info.dosDate,&file_info.tmu_date);

    	if (unzlocal_getLong(s->file,&file_info.crc) != UNZ_OK)
    		err=UNZ_ERRNO;

    	if (unzlocal_getLong(s->file,&file_info.compressed_size) != UNZ_OK)
    		err=UNZ_ERRNO;

    	if (unzlocal_getLong(s->file,&file_info.uncompressed_size) != UNZ_OK)
    		err=UNZ_ERRNO;

    	if (unzlocal_getShort(s->file,&file_info.size_filename) != UNZ_OK)
    		err=UNZ_ERRNO;

    	if (unzlocal_getShort(s->file,&file_info.size_file_extra) != UNZ_OK)
    		err=UNZ_ERRNO;

    	if (unzlocal_getShort(s->file,&file_info.size_file_comment) != UNZ_OK)
    		err=UNZ_ERRNO;

    	if (unzlocal_getShort(s->file,&file_info.disk_num_start) != UNZ_OK)
    		err=UNZ_ERRNO;

    	if (unzlocal_getShort(s->file,&file_info.internal_fa) != UNZ_OK)
    		err=UNZ_ERRNO;

    	if (unzlocal_getLong(s->file,&file_info.external_fa) != UNZ_OK)
    		err=UNZ_ERRNO;

    	if (unzlocal_getLong(s->file,&file_info_internal.offset_curfile) != UNZ_OK)
    		err=UNZ_ERRNO;

    	lSeek+=file_info.size_filename;
    	if ((err==UNZ_OK) && (szFileName!=NULL))
    	{
    		uLong uSizeRead ;
    		if (file_info.size_filename<fileNameBufferSize)
    		{
    			*(szFileName+file_info.size_filename)='\0';
    			uSizeRead = file_info.size_filename;
    		}
    		else
    			uSizeRead = fileNameBufferSize;

    		if ((file_info.size_filename>0) && (fileNameBufferSize>0))
    			if (fread(szFileName,(uInt)uSizeRead,1,s->file)!=1)
    				err=UNZ_ERRNO;
    		lSeek -= uSizeRead;
    	}

    	if ((err==UNZ_OK) && (extraField!=NULL))
    	{
    		uLong uSizeRead ;
    		if (file_info.size_file_extra<extraFieldBufferSize)
    			uSizeRead = file_info.size_file_extra;
    		else
    			uSizeRead = extraFieldBufferSize;

    		if (lSeek!=0)
    			if (fseek(s->file,lSeek,SEEK_CUR)==0)
    				lSeek=0;
    			else
    				err=UNZ_ERRNO;
    		if ((file_info.size_file_extra>0) && (extraFieldBufferSize>0))
    			if (fread(extraField,(uInt)uSizeRead,1,s->file)!=1)
    				err=UNZ_ERRNO;
    		lSeek += file_info.size_file_extra - uSizeRead;
    	}
    	else
    		lSeek+=file_info.size_file_extra;

    	if ((err==UNZ_OK) && (szComment!=NULL))
    	{
    		uLong uSizeRead ;
    		if (file_info.size_file_comment<commentBufferSize)
    		{
    			*(szComment+file_info.size_file_comment)='\0';
    			uSizeRead = file_info.size_file_comment;
    		}
    		else
    			uSizeRead = commentBufferSize;

    		if (lSeek!=0)
    			if (fseek(s->file,lSeek,SEEK_CUR)==0)
    				lSeek=0;
    			else
    				err=UNZ_ERRNO;
    		if ((file_info.size_file_comment>0) && (commentBufferSize>0))
    			if (fread(szComment,(uInt)uSizeRead,1,s->file)!=1)
    				err=UNZ_ERRNO;
    		lSeek+=file_info.size_file_comment - uSizeRead;
    	}
    	else
    		lSeek+=file_info.size_file_comment;

    	if ((err==UNZ_OK) && (pfile_info!=NULL))
    		*pfile_info=file_info;

    	if ((err==UNZ_OK) && (pfile_info_internal!=NULL))
    		*pfile_info_internal=file_info_internal;

    	return err;
    }

    /*
      Write info about the ZipFile in the *pglobal_info structure.
      No preparation of the structure is needed
      return UNZ_OK if there is no problem.
    */
    extern int ZEXPORT unzGetCurrentFileInfo (file,
                                                      pfile_info,
                                                      szFileName, fileNameBufferSize,
                                                      extraField, extraFieldBufferSize,
                                                      szComment,  commentBufferSize)
    	unzFile file;
    	unz_file_info *pfile_info;
    	char *szFileName;
    	uLong fileNameBufferSize;
    	void *extraField;
    	uLong extraFieldBufferSize;
    	char *szComment;
    	uLong commentBufferSize;
    {
    	return unzlocal_GetCurrentFileInfoInternal(file,pfile_info,NULL,
    												szFileName,fileNameBufferSize,
    												extraField,extraFieldBufferSize,
    												szComment,commentBufferSize);
    }

    /*
      Set the current file of the zipfile to the first file.
      return UNZ_OK if there is no problem
    */
    extern int ZEXPORT unzGoToFirstFile (file)
    	unzFile file;
    {
    	int err=UNZ_OK;
    	unz_s* s;
    	if (file==NULL)
    		return UNZ_PARAMERROR;
    	s=(unz_s*)file;
    	s->pos_in_central_dir=s->offset_central_dir;
    	s->num_file=0;
    	err=unzlocal_GetCurrentFileInfoInternal(file,&s->cur_file_info,
    											 &s->cur_file_info_internal,
    											 NULL,0,NULL,0,NULL,0);
    	s->current_file_ok = (err == UNZ_OK);
    	return err;
    }

    /*
      Set the current file of the zipfile to the next file.
      return UNZ_OK if there is no problem
      return UNZ_END_OF_LIST_OF_FILE if the actual file was the latest.
    */
    extern int ZEXPORT unzGoToNextFile (file)
    	unzFile file;
    {
    	unz_s* s;
    	int err;

    	if (file==NULL)
    		return UNZ_PARAMERROR;
    	s=(unz_s*)file;
    	if (!s->current_file_ok)
    		return UNZ_END_OF_LIST_OF_FILE;
    	if (s->num_file+1==s->gi.number_entry)
    		return UNZ_END_OF_LIST_OF_FILE;

    	s->pos_in_central_dir += SIZECENTRALDIRITEM + s->cur_file_info.size_filename +
    			s->cur_file_info.size_file_extra + s->cur_file_info.size_file_comment ;
    	s->num_file++;
    	err = unzlocal_GetCurrentFileInfoInternal(file,&s->cur_file_info,
    											   &s->cur_file_info_internal,
    											   NULL,0,NULL,0,NULL,0);
    	s->current_file_ok = (err == UNZ_OK);
    	return err;
    }

    /*
      Try locate the file szFileName in the zipfile.
      For the iCaseSensitivity signification, see unzipStringFileNameCompare

      return value :
      UNZ_OK if the file is found. It becomes the current file.
      UNZ_END_OF_LIST_OF_FILE if the file is not found
    */
    extern int ZEXPORT unzLocateFile (file, szFileName, iCaseSensitivity)
    	unzFile file;
    	const char *szFileName;
    	int iCaseSensitivity;
    {
    	unz_s* s;
    	int err;

    	uLong num_fileSaved;
    	uLong pos_in_central_dirSaved;

    	if (file==NULL)
    		return UNZ_PARAMERROR;

        if (strlen(szFileName)>=UNZ_MAXFILENAMEINZIP)
            return UNZ_PARAMERROR;

    	s=(unz_s*)file;
    	if (!s->current_file_ok)
    		return UNZ_END_OF_LIST_OF_FILE;

    	num_fileSaved = s->num_file;
    	pos_in_central_dirSaved = s->pos_in_central_dir;

    	err = unzGoToFirstFile(file);

    	while (err == UNZ_OK)
    	{
    		char szCurrentFileName[UNZ_MAXFILENAMEINZIP+1];
    		unzGetCurrentFileInfo(file,NULL,
    								szCurrentFileName,sizeof(szCurrentFileName)-1,
    								NULL,0,NULL,0);
    		if (unzStringFileNameCompare(szCurrentFileName,
    										szFileName,iCaseSensitivity)==0)
    			return UNZ_OK;
    		err = unzGoToNextFile(file);
    	}

    	s->num_file = num_fileSaved ;
    	s->pos_in_central_dir = pos_in_central_dirSaved ;
    	return err;
    }

    /*
      Read the local header of the current zipfile
      Check the coherency of the local header and info in the end of central
            directory about this file
      store in *piSizeVar the size of extra info in local header
            (filename and size of extra field data)
    */
    local int unzlocal_CheckCurrentFileCoherencyHeader (s,piSizeVar,
    													poffset_local_extrafield,
    													psize_local_extrafield)
    	unz_s* s;
    	uInt* piSizeVar;
    	uLong *poffset_local_extrafield;
    	uInt  *psize_local_extrafield;
    {
    	uLong uMagic,uData,uFlags;
    	uLong size_filename;
    	uLong size_extra_field;
    	int err=UNZ_OK;

    	*piSizeVar = 0;
    	*poffset_local_extrafield = 0;
    	*psize_local_extrafield = 0;

    	if (fseek(s->file,s->cur_file_info_internal.offset_curfile +
    								s->byte_before_the_zipfile,SEEK_SET)!=0)
    		return UNZ_ERRNO;

    	if (err==UNZ_OK)
    		if (unzlocal_getLong(s->file,&uMagic) != UNZ_OK)
    			err=UNZ_ERRNO;
    		else if (uMagic!=0x04034b50)
    			err=UNZ_BADZIPFILE;

    	if (unzlocal_getShort(s->file,&uData) != UNZ_OK)
    		err=UNZ_ERRNO;
    /*
    	else if ((err==UNZ_OK) && (uData!=s->cur_file_info.wVersion))
    		err=UNZ_BADZIPFILE;
    */
    	if (unzlocal_getShort(s->file,&uFlags) != UNZ_OK)
    		err=UNZ_ERRNO;

    	if (unzlocal_getShort(s->file,&uData) != UNZ_OK)
    		err=UNZ_ERRNO;
    	else if ((err==UNZ_OK) && (uData!=s->cur_file_info.compression_method))
    		err=UNZ_BADZIPFILE;

        if ((err==UNZ_OK) && (s->cur_file_info.compression_method!=0) &&
                             (s->cur_file_info.compression_method!=Z_DEFLATED))
            err=UNZ_BADZIPFILE;

    	if (unzlocal_getLong(s->file,&uData) != UNZ_OK) /* date/time */
    		err=UNZ_ERRNO;

    	if (unzlocal_getLong(s->file,&uData) != UNZ_OK) /* crc */
    		err=UNZ_ERRNO;
    	else if ((err==UNZ_OK) && (uData!=s->cur_file_info.crc) &&
    		                      ((uFlags & 8)==0))
    		err=UNZ_BADZIPFILE;

    	if (unzlocal_getLong(s->file,&uData) != UNZ_OK) /* size compr */
    		err=UNZ_ERRNO;
    	else if ((err==UNZ_OK) && (uData!=s->cur_file_info.compressed_size) &&
    							  ((uFlags & 8)==0))
    		err=UNZ_BADZIPFILE;

    	if (unzlocal_getLong(s->file,&uData) != UNZ_OK) /* size uncompr */
    		err=UNZ_ERRNO;
    	else if ((err==UNZ_OK) && (uData!=s->cur_file_info.uncompressed_size) &&
    							  ((uFlags & 8)==0))
    		err=UNZ_BADZIPFILE;

    	if (unzlocal_getShort(s->file,&size_filename) != UNZ_OK)
    		err=UNZ_ERRNO;
    	else if ((err==UNZ_OK) && (size_filename!=s->cur_file_info.size_filename))
    		err=UNZ_BADZIPFILE;

    	*piSizeVar += (uInt)size_filename;

    	if (unzlocal_getShort(s->file,&size_extra_field) != UNZ_OK)
    		err=UNZ_ERRNO;
    	*poffset_local_extrafield= s->cur_file_info_internal.offset_curfile +
    									SIZEZIPLOCALHEADER + size_filename;
    	*psize_local_extrafield = (uInt)size_extra_field;

    	*piSizeVar += (uInt)size_extra_field;

    	return err;
    }

    /*
      Open for reading data the current file in the zipfile.
      If there is no error and the file is opened, the return value is UNZ_OK.
    */
    extern int ZEXPORT unzOpenCurrentFile (file)
    	unzFile file;
    {
    	int err=UNZ_OK;
    	int Store;
    	uInt iSizeVar;
    	unz_s* s;
    	file_in_zip_read_info_s* pfile_in_zip_read_info;
    	uLong offset_local_extrafield;  /* offset of the local extra field */
    	uInt  size_local_extrafield;    /* size of the local extra field */

    	if (file==NULL)
    		return UNZ_PARAMERROR;
    	s=(unz_s*)file;
    	if (!s->current_file_ok)
    		return UNZ_PARAMERROR;

        if (s->pfile_in_zip_read != NULL)
            unzCloseCurrentFile(file);

    	if (unzlocal_CheckCurrentFileCoherencyHeader(s,&iSizeVar,
    				&offset_local_extrafield,&size_local_extrafield)!=UNZ_OK)
    		return UNZ_BADZIPFILE;

    	pfile_in_zip_read_info = (file_in_zip_read_info_s*)
    									    ALLOC(sizeof(file_in_zip_read_info_s));
    	if (pfile_in_zip_read_info==NULL)
    		return UNZ_INTERNALERROR;

    	pfile_in_zip_read_info->read_buffer=(char*)ALLOC(UNZ_BUFSIZE);
    	pfile_in_zip_read_info->offset_local_extrafield = offset_local_extrafield;
    	pfile_in_zip_read_info->size_local_extrafield = size_local_extrafield;
    	pfile_in_zip_read_info->pos_local_extrafield=0;

    	if (pfile_in_zip_read_info->read_buffer==NULL)
    	{
    		TRYFREE(pfile_in_zip_read_info);
    		return UNZ_INTERNALERROR;
    	}

    	pfile_in_zip_read_info->stream_initialised=0;

    	if ((s->cur_file_info.compression_method!=0) &&
            (s->cur_file_info.compression_method!=Z_DEFLATED))
    		err=UNZ_BADZIPFILE;
    	Store = s->cur_file_info.compression_method==0;

    	pfile_in_zip_read_info->crc32_wait=s->cur_file_info.crc;
    	pfile_in_zip_read_info->crc32=0;
    	pfile_in_zip_read_info->compression_method =
                s->cur_file_info.compression_method;
    	pfile_in_zip_read_info->file=s->file;
    	pfile_in_zip_read_info->byte_before_the_zipfile=s->byte_before_the_zipfile;

        pfile_in_zip_read_info->stream.total_out = 0;

    	if (!Store)
    	{
    	  pfile_in_zip_read_info->stream.zalloc = (alloc_func)0;
    	  pfile_in_zip_read_info->stream.zfree = (free_func)0;
    	  pfile_in_zip_read_info->stream.opaque = (voidpf)0;

    	  err=inflateInit2(&pfile_in_zip_read_info->stream, -MAX_WBITS);
    	  if (err == Z_OK)
    	    pfile_in_zip_read_info->stream_initialised=1;
            /* windowBits is passed < 0 to tell that there is no zlib header.
             * Note that in this case inflate *requires* an extra "dummy" byte
             * after the compressed stream in order to complete decompression and
             * return Z_STREAM_END.
             * In unzip, i don't wait absolutely Z_STREAM_END because I known the
             * size of both compressed and uncompressed data
             */
    	}
    	pfile_in_zip_read_info->rest_read_compressed =
                s->cur_file_info.compressed_size ;
    	pfile_in_zip_read_info->rest_read_uncompressed =
                s->cur_file_info.uncompressed_size ;

    	pfile_in_zip_read_info->pos_in_zipfile =
                s->cur_file_info_internal.offset_curfile + SIZEZIPLOCALHEADER +
    			  iSizeVar;

    	pfile_in_zip_read_info->stream.avail_in = (uInt)0;

    	s->pfile_in_zip_read = pfile_in_zip_read_info;
        return UNZ_OK;
    }

    /*
      Read bytes from the current file.
      buf contain buffer where data must be copied
      len the size of buf.

      return the number of byte copied if somes bytes are copied
      return 0 if the end of file was reached
      return <0 with error code if there is an error
        (UNZ_ERRNO for IO error, or zLib error for uncompress error)
    */
    extern int ZEXPORT unzReadCurrentFile  (file, buf, len)
    	unzFile file;
    	voidp buf;
    	unsigned len;
    {
    	int err=UNZ_OK;
    	uInt iRead = 0;
    	unz_s* s;
    	file_in_zip_read_info_s* pfile_in_zip_read_info;
    	if (file==NULL)
    		return UNZ_PARAMERROR;
    	s=(unz_s*)file;
        pfile_in_zip_read_info=s->pfile_in_zip_read;

    	if (pfile_in_zip_read_info==NULL)
    		return UNZ_PARAMERROR;

    	if ((pfile_in_zip_read_info->read_buffer == NULL))
    		return UNZ_END_OF_LIST_OF_FILE;
    	if (len==0)
    		return 0;

    	pfile_in_zip_read_info->stream.next_out = (Bytef*)buf;

    	pfile_in_zip_read_info->stream.avail_out = (uInt)len;

    	if (len>pfile_in_zip_read_info->rest_read_uncompressed)
    		pfile_in_zip_read_info->stream.avail_out =
    		  (uInt)pfile_in_zip_read_info->rest_read_uncompressed;

    	while (pfile_in_zip_read_info->stream.avail_out>0)
    	{
    		if ((pfile_in_zip_read_info->stream.avail_in==0) &&
                (pfile_in_zip_read_info->rest_read_compressed>0))
    		{
    			uInt uReadThis = UNZ_BUFSIZE;
    			if (pfile_in_zip_read_info->rest_read_compressed<uReadThis)
    				uReadThis = (uInt)pfile_in_zip_read_info->rest_read_compressed;
    			if (uReadThis == 0)
    				return UNZ_EOF;
    			if (fseek(pfile_in_zip_read_info->file,
                          pfile_in_zip_read_info->pos_in_zipfile +
                             pfile_in_zip_read_info->byte_before_the_zipfile,SEEK_SET)!=0)
    				return UNZ_ERRNO;
    			if (fread(pfile_in_zip_read_info->read_buffer,uReadThis,1,
                             pfile_in_zip_read_info->file)!=1)
    				return UNZ_ERRNO;
    			pfile_in_zip_read_info->pos_in_zipfile += uReadThis;

    			pfile_in_zip_read_info->rest_read_compressed-=uReadThis;

    			pfile_in_zip_read_info->stream.next_in =
                    (Bytef*)pfile_in_zip_read_info->read_buffer;
    			pfile_in_zip_read_info->stream.avail_in = (uInt)uReadThis;
    		}

    		if (pfile_in_zip_read_info->compression_method==0)
    		{
    			uInt uDoCopy,i ;
    			if (pfile_in_zip_read_info->stream.avail_out <
                                pfile_in_zip_read_info->stream.avail_in)
    				uDoCopy = pfile_in_zip_read_info->stream.avail_out ;
    			else
    				uDoCopy = pfile_in_zip_read_info->stream.avail_in ;

    			for (i=0;i<uDoCopy;i++)
    				*(pfile_in_zip_read_info->stream.next_out+i) =
                            *(pfile_in_zip_read_info->stream.next_in+i);

    			pfile_in_zip_read_info->crc32 = crc32(pfile_in_zip_read_info->crc32,
    								pfile_in_zip_read_info->stream.next_out,
    								uDoCopy);
    			pfile_in_zip_read_info->rest_read_uncompressed-=uDoCopy;
    			pfile_in_zip_read_info->stream.avail_in -= uDoCopy;
    			pfile_in_zip_read_info->stream.avail_out -= uDoCopy;
    			pfile_in_zip_read_info->stream.next_out += uDoCopy;
    			pfile_in_zip_read_info->stream.next_in += uDoCopy;
                pfile_in_zip_read_info->stream.total_out += uDoCopy;
    			iRead += uDoCopy;
    		}
    		else
    		{
    			uLong uTotalOutBefore,uTotalOutAfter;
    			const Bytef *bufBefore;
    			uLong uOutThis;
    			int flush=Z_SYNC_FLUSH;

    			uTotalOutBefore = pfile_in_zip_read_info->stream.total_out;
    			bufBefore = pfile_in_zip_read_info->stream.next_out;

    			/*
    			if ((pfile_in_zip_read_info->rest_read_uncompressed ==
    			         pfile_in_zip_read_info->stream.avail_out) &&
    				(pfile_in_zip_read_info->rest_read_compressed == 0))
    				flush = Z_FINISH;
    			*/
    			err=inflate(&pfile_in_zip_read_info->stream,flush);

    			uTotalOutAfter = pfile_in_zip_read_info->stream.total_out;
    			uOutThis = uTotalOutAfter-uTotalOutBefore;

    			pfile_in_zip_read_info->crc32 =
                    crc32(pfile_in_zip_read_info->crc32,bufBefore,
                            (uInt)(uOutThis));

    			pfile_in_zip_read_info->rest_read_uncompressed -=
                    uOutThis;

    			iRead += (uInt)(uTotalOutAfter - uTotalOutBefore);

    			if (err==Z_STREAM_END)
    				return (iRead==0) ? UNZ_EOF : iRead;
    			if (err!=Z_OK)
    				break;
    		}
    	}

    	if (err==Z_OK)
    		return iRead;
    	return err;
    }

    /*
      Give the current position in uncompressed data
    */
    extern z_off_t ZEXPORT unztell (file)
    	unzFile file;
    {
    	unz_s* s;
    	file_in_zip_read_info_s* pfile_in_zip_read_info;
    	if (file==NULL)
    		return UNZ_PARAMERROR;
    	s=(unz_s*)file;
        pfile_in_zip_read_info=s->pfile_in_zip_read;

    	if (pfile_in_zip_read_info==NULL)
    		return UNZ_PARAMERROR;

    	return (z_off_t)pfile_in_zip_read_info->stream.total_out;
    }

    /*
      return 1 if the end of file was reached, 0 elsewhere
    */
    extern int ZEXPORT unzeof (file)
    	unzFile file;
    {
    	unz_s* s;
    	file_in_zip_read_info_s* pfile_in_zip_read_info;
    	if (file==NULL)
    		return UNZ_PARAMERROR;
    	s=(unz_s*)file;
        pfile_in_zip_read_info=s->pfile_in_zip_read;

    	if (pfile_in_zip_read_info==NULL)
    		return UNZ_PARAMERROR;

    	if (pfile_in_zip_read_info->rest_read_uncompressed == 0)
    		return 1;
    	else
    		return 0;
    }

    /*
      Read extra field from the current file (opened by unzOpenCurrentFile)
      This is the local-header version of the extra field (sometimes, there is
        more info in the local-header version than in the central-header)

      if buf==NULL, it return the size of the local extra field that can be read

      if buf!=NULL, len is the size of the buffer, the extra header is copied in
    	buf.
      the return value is the number of bytes copied in buf, or (if <0)
    	the error code
    */
    extern int ZEXPORT unzGetLocalExtrafield (file,buf,len)
    	unzFile file;
    	voidp buf;
    	unsigned len;
    {
    	unz_s* s;
    	file_in_zip_read_info_s* pfile_in_zip_read_info;
    	uInt read_now;
    	uLong size_to_read;

    	if (file==NULL)
    		return UNZ_PARAMERROR;
    	s=(unz_s*)file;
        pfile_in_zip_read_info=s->pfile_in_zip_read;

    	if (pfile_in_zip_read_info==NULL)
    		return UNZ_PARAMERROR;

    	size_to_read = (pfile_in_zip_read_info->size_local_extrafield -
    				pfile_in_zip_read_info->pos_local_extrafield);

    	if (buf==NULL)
    		return (int)size_to_read;

    	if (len>size_to_read)
    		read_now = (uInt)size_to_read;
    	else
    		read_now = (uInt)len ;

    	if (read_now==0)
    		return 0;

    	if (fseek(pfile_in_zip_read_info->file,
                  pfile_in_zip_read_info->offset_local_extrafield +
    			  pfile_in_zip_read_info->pos_local_extrafield,SEEK_SET)!=0)
    		return UNZ_ERRNO;

    	if (fread(buf,(uInt)size_to_read,1,pfile_in_zip_read_info->file)!=1)
    		return UNZ_ERRNO;

    	return (int)read_now;
    }

    /*
      Close the file in zip opened with unzipOpenCurrentFile
      Return UNZ_CRCERROR if all the file was read but the CRC is not good
    */
    extern int ZEXPORT unzCloseCurrentFile (file)
    	unzFile file;
    {
    	int err=UNZ_OK;

    	unz_s* s;
    	file_in_zip_read_info_s* pfile_in_zip_read_info;
    	if (file==NULL)
    		return UNZ_PARAMERROR;
    	s=(unz_s*)file;
        pfile_in_zip_read_info=s->pfile_in_zip_read;

    	if (pfile_in_zip_read_info==NULL)
    		return UNZ_PARAMERROR;

    	if (pfile_in_zip_read_info->rest_read_uncompressed == 0)
    	{
    		if (pfile_in_zip_read_info->crc32 != pfile_in_zip_read_info->crc32_wait)
    			err=UNZ_CRCERROR;
    	}

    	TRYFREE(pfile_in_zip_read_info->read_buffer);
    	pfile_in_zip_read_info->read_buffer = NULL;
    	if (pfile_in_zip_read_info->stream_initialised)
    		inflateEnd(&pfile_in_zip_read_info->stream);

    	pfile_in_zip_read_info->stream_initialised = 0;
    	TRYFREE(pfile_in_zip_read_info);

        s->pfile_in_zip_read=NULL;

    	return err;
    }

    /*
      Get the global comment string of the ZipFile, in the szComment buffer.
      uSizeBuf is the size of the szComment buffer.
      return the number of byte copied or an error code <0
    */
    extern int ZEXPORT unzGetGlobalComment (file, szComment, uSizeBuf)
    	unzFile file;
    	char *szComment;
    	uLong uSizeBuf;
    {
    	int err=UNZ_OK;
    	unz_s* s;
    	uLong uReadThis ;
    	if (file==NULL)
    		return UNZ_PARAMERROR;
    	s=(unz_s*)file;

    	uReadThis = uSizeBuf;
    	if (uReadThis>s->gi.size_comment)
    		uReadThis = s->gi.size_comment;

    	if (fseek(s->file,s->central_pos+22,SEEK_SET)!=0)
    		return UNZ_ERRNO;

    	if (uReadThis>0)
        {
          *szComment='\0';
    	  if (fread(szComment,(uInt)uReadThis,1,s->file)!=1)
    		return UNZ_ERRNO;
        }

    	if ((szComment != NULL) && (uSizeBuf > s->gi.size_comment))
    		*(szComment+s->gi.size_comment)='\0';
    	return (int)uReadThis;
    }

Currently browsing [compression_0_1.zip] (31,945 bytes) - [Compression/Zip/unzip.h] - (10,205 bytes)

    /* unzip.h -- IO for uncompress .zip files using zlib
       Version 0.15 beta, Mar 19th, 1998,

       Copyright (C) 1998 Gilles Vollant

       This unzip package allow extract file from .ZIP file, compatible with PKZip 2.04g
         WinZip, InfoZip tools and compatible.
       Encryption and multi volume ZipFile (span) are not supported.
       Old compressions used by old PKZip 1.x are not supported

       THIS IS AN ALPHA VERSION. AT THIS STAGE OF DEVELOPPEMENT, SOMES API OR STRUCTURE
       CAN CHANGE IN FUTURE VERSION !!
       I WAIT FEEDBACK at mail info@winimage.com
       Visit also http://www.winimage.com/zLibDll/unzip.htm for evolution

       Condition of use and distribution are the same than zlib :

      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
      freely, subject to the following restrictions:

      1. The origin of this software must not be misrepresented; you must not
         claim that you wrote the original software. If you use this software
         in a product, an acknowledgment in the product documentation would be
         appreciated but is not required.
      2. Altered source versions must be plainly marked as such, and must not be
         misrepresented as being the original software.
      3. This notice may not be removed or altered from any source distribution.

    */
    /* for more info about .ZIP format, see
          ftp://ftp.cdrom.com/pub/infozip/doc/appnote-970311-iz.zip
       PkWare has also a specification at :
          ftp://ftp.pkware.com/probdesc.zip */

    #ifndef _unz_H
    #define _unz_H

    #ifdef __cplusplus
    extern "C" {
    #endif

    #ifndef _ZLIB_H
    #include "zlib.h"
    #endif

    #if defined(STRICTUNZIP) || defined(STRICTZIPUNZIP)
    /* like the STRICT of WIN32, we define a pointer that cannot be converted
        from (void*) without cast */
    typedef struct TagunzFile__ { int unused; } unzFile__;
    typedef unzFile__ *unzFile;
    #else
    typedef voidp unzFile;
    #endif

    #define UNZ_OK                                  (0)
    #define UNZ_END_OF_LIST_OF_FILE (-100)
    #define UNZ_ERRNO               (Z_ERRNO)
    #define UNZ_EOF                 (0)
    #define UNZ_PARAMERROR                  (-102)
    #define UNZ_BADZIPFILE                  (-103)
    #define UNZ_INTERNALERROR               (-104)
    #define UNZ_CRCERROR                    (-105)

    /* tm_unz contain date/time info */
    typedef struct tm_unz_s
    {
    	uInt tm_sec;            /* seconds after the minute - [0,59] */
    	uInt tm_min;            /* minutes after the hour - [0,59] */
    	uInt tm_hour;           /* hours since midnight - [0,23] */
    	uInt tm_mday;           /* day of the month - [1,31] */
    	uInt tm_mon;            /* months since January - [0,11] */
    	uInt tm_year;           /* years - [1980..2044] */
    } tm_unz;

    /* unz_global_info structure contain global data about the ZIPfile
       These data comes from the end of central dir */
    typedef struct unz_global_info_s
    {
    	uLong number_entry;         /* total number of entries in
    				       the central dir on this disk */
    	uLong size_comment;         /* size of the global comment of the zipfile */
    } unz_global_info;

    /* unz_file_info contain information about a file in the zipfile */
    typedef struct unz_file_info_s
    {
        uLong version;              /* version made by                 2 bytes */
        uLong version_needed;       /* version needed to extract       2 bytes */
        uLong flag;                 /* general purpose bit flag        2 bytes */
        uLong compression_method;   /* compression method              2 bytes */
        uLong dosDate;              /* last mod file date in Dos fmt   4 bytes */
        uLong crc;                  /* crc-32                          4 bytes */
        uLong compressed_size;      /* compressed size                 4 bytes */
        uLong uncompressed_size;    /* uncompressed size               4 bytes */
        uLong size_filename;        /* filename length                 2 bytes */
        uLong size_file_extra;      /* extra field length              2 bytes */
        uLong size_file_comment;    /* file comment length             2 bytes */

        uLong disk_num_start;       /* disk number start               2 bytes */
        uLong internal_fa;          /* internal file attributes        2 bytes */
        uLong external_fa;          /* external file attributes        4 bytes */

        tm_unz tmu_date;
    } unz_file_info;

    extern int ZEXPORT unzStringFileNameCompare OF ((const char* fileName1,
    												 const char* fileName2,
    												 int iCaseSensitivity));
    /*
       Compare two filename (fileName1,fileName2).
       If iCaseSenisivity = 1, comparision is case sensitivity (like strcmp)
       If iCaseSenisivity = 2, comparision is not case sensitivity (like strcmpi
    								or strcasecmp)
       If iCaseSenisivity = 0, case sensitivity is defaut of your operating system
    	(like 1 on Unix, 2 on Windows)
    */

    extern unzFile ZEXPORT unzOpen OF((const char *path));
    /*
      Open a Zip file. path contain the full pathname (by example,
         on a Windows NT computer "c:\\zlib\\zlib111.zip" or on an Unix computer
    	 "zlib/zlib111.zip".
    	 If the zipfile cannot be opened (file don't exist or in not valid), the
    	   return value is NULL.
         Else, the return value is a unzFile Handle, usable with other function
    	   of this unzip package.
    */

    extern int ZEXPORT unzClose OF((unzFile file));
    /*
      Close a ZipFile opened with unzipOpen.
      If there is files inside the .Zip opened with unzOpenCurrentFile (see later),
        these files MUST be closed with unzipCloseCurrentFile before call unzipClose.
      return UNZ_OK if there is no problem. */

    extern int ZEXPORT unzGetGlobalInfo OF((unzFile file,
    					unz_global_info *pglobal_info));
    /*
      Write info about the ZipFile in the *pglobal_info structure.
      No preparation of the structure is needed
      return UNZ_OK if there is no problem. */

    extern int ZEXPORT unzGetGlobalComment OF((unzFile file,
    										   char *szComment,
    					   uLong uSizeBuf));
    /*
      Get the global comment string of the ZipFile, in the szComment buffer.
      uSizeBuf is the size of the szComment buffer.
      return the number of byte copied or an error code <0
    */

    /***************************************************************************/
    /* Unzip package allow you browse the directory of the zipfile */

    extern int ZEXPORT unzGoToFirstFile OF((unzFile file));
    /*
      Set the current file of the zipfile to the first file.
      return UNZ_OK if there is no problem
    */

    extern int ZEXPORT unzGoToNextFile OF((unzFile file));
    /*
      Set the current file of the zipfile to the next file.
      return UNZ_OK if there is no problem
      return UNZ_END_OF_LIST_OF_FILE if the actual file was the latest.
    */

    extern int ZEXPORT unzLocateFile OF((unzFile file,
    				     const char *szFileName,
    				     int iCaseSensitivity));
    /*
      Try locate the file szFileName in the zipfile.
      For the iCaseSensitivity signification, see unzStringFileNameCompare

      return value :
      UNZ_OK if the file is found. It becomes the current file.
      UNZ_END_OF_LIST_OF_FILE if the file is not found
    */

    extern int ZEXPORT unzGetCurrentFileInfo OF((unzFile file,
    					     unz_file_info *pfile_info,
    					     char *szFileName,
    					     uLong fileNameBufferSize,
    					     void *extraField,
    					     uLong extraFieldBufferSize,
    					     char *szComment,
    					     uLong commentBufferSize));
    /*
      Get Info about the current file
      if pfile_info!=NULL, the *pfile_info structure will contain somes info about
    	    the current file
      if szFileName!=NULL, the filemane 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)
    */

    /***************************************************************************/
    /* for reading the content of the current zipfile, you can open it, read data
       from it, and close it (you can close it before reading all the file)
       */

    extern int ZEXPORT unzOpenCurrentFile OF((unzFile file));
    /*
      Open for reading data the current file in the zipfile.
      If there is no error, the return value is UNZ_OK.
    */

    extern int ZEXPORT unzCloseCurrentFile OF((unzFile file));
    /*
      Close the file in zip opened with unzOpenCurrentFile
      Return UNZ_CRCERROR if all the file was read but the CRC is not good
    */

    extern int ZEXPORT unzReadCurrentFile OF((unzFile file,
    					  voidp buf,
    					  unsigned len));
    /*
      Read bytes from the current file (opened by unzOpenCurrentFile)
      buf contain buffer where data must be copied
      len the size of buf.

      return the number of byte copied if somes bytes are copied
      return 0 if the end of file was reached
      return <0 with error code if there is an error
        (UNZ_ERRNO for IO error, or zLib error for uncompress error)
    */

    extern z_off_t ZEXPORT unztell OF((unzFile file));
    /*
      Give the current position in uncompressed data
    */

    extern int ZEXPORT unzeof OF((unzFile file));
    /*
      return 1 if the end of file was reached, 0 elsewhere
    */

    extern int ZEXPORT unzGetLocalExtrafield OF((unzFile file,
    											 voidp buf,
    											 unsigned len));
    /*
      Read extra field from the current file (opened by unzOpenCurrentFile)
      This is the local-header version of the extra field (sometimes, there is
        more info in the local-header version than in the central-header)

      if buf==NULL, it return the size of the local extra field

      if buf!=NULL, len is the size of the buffer, the extra header is copied in
    	buf.
      the return value is the number of bytes copied in buf, or (if <0)
    	the error code
    */

    #ifdef __cplusplus
    }
    #endif

    #endif /* _unz_H */

Currently browsing [compression_0_1.zip] (31,945 bytes) - [Compression/Zip/zip.c] - (22,025 bytes)

    /* zip.c -- IO on .zip files using zlib
       Version 0.15 beta, Mar 19th, 1998,

       Read zip.h for more info
    */

    #include <stdio.h>
    #include <stdlib.h>
    #include <string.h>
    #include "zlib.h"
    #include "zutil.h"
    #include "zip.h"

    #ifdef STDC
    #  include <stddef.h>
    #  include <string.h>
    #  include <stdlib.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 depedent */
    #endif

    #ifndef Z_BUFSIZE
    #define Z_BUFSIZE (16384)
    #endif

    #ifndef Z_MAXFILENAMEINZIP
    #define Z_MAXFILENAMEINZIP (256)
    #endif

    #ifndef ALLOC
    # define ALLOC(size) (malloc(size))
    #endif
    #ifndef TRYFREE
    # define TRYFREE(p) {if (p) free(p);}
    #endif

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

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

    #ifndef SEEK_CUR
    #define SEEK_CUR    1
    #endif

    #ifndef SEEK_END
    #define SEEK_END    2
    #endif

    #ifndef SEEK_SET
    #define SEEK_SET    0
    #endif

    const char zip_copyright[] =
       " zip 0.15 Copyright 1998 Gilles Vollant ";

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

    #define LOCALHEADERMAGIC    (0x04034b50)
    #define CENTRALHEADERMAGIC  (0x02014b50)
    #define ENDHEADERMAGIC      (0x06054b50)

    #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 alignement */
      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;

    typedef struct
    {
    	z_stream stream;            /* zLib stream structure for inflate */
        int  stream_initialised;    /* 1 is stream is initialised */
        uInt pos_in_buffered_data;  /* last written byte in buffered_data */

        uLong pos_local_header;     /* offset of the local header of the file
                                         currenty writing */
        char* central_header;       /* central header data for the current file */
        uLong size_centralheader;   /* size of the central header for cur file */
        uLong flag;                 /* flag of the file currently writing */

        int  method;                /* compression method of file currenty wr.*/
        Byte buffered_data[Z_BUFSIZE];/* buffer contain compressed data to be writ*/
        uLong dosDate;
        uLong crc32;
    } curfile_info;

    typedef struct
    {
        FILE * filezip;
        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.*/
        curfile_info ci;            /* info on the file curretly writing */

        uLong begin_pos;            /* position of the beginning of the zipfile */
        uLong number_entry;
    } zip_internal;

    local linkedlist_datablock_internal* allocate_new_datablock()
    {
        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(ldi)
        linkedlist_datablock_internal* ldi;
    {
        while (ldi!=NULL)
        {
            linkedlist_datablock_internal* ldinext = ldi->next_datablock;
            TRYFREE(ldi);
            ldi = ldinext;
        }
    }

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

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

    local int add_data_in_datablock(ll,buf,len)
        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 = (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;
    }

    local int write_datablock(fout,ll)
        FILE * fout;
        linkedlist_data* ll;
    {
        linkedlist_datablock_internal* ldi;
        ldi = ll->first_block;
        while (ldi!=NULL)
        {
            if (ldi->filled_in_this_block > 0)
                if (fwrite(ldi->data,(uInt)ldi->filled_in_this_block,1,fout)!=1)
                    return ZIP_ERRNO;
            ldi = ldi->next_datablock;
        }
        return ZIP_OK;
    }

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

    /* ===========================================================================
       Outputs a long in LSB order to the given file
       nbByte == 1, 2 or 4 (byte, short or long)
    */

    local int ziplocal_putValue OF((FILE *file, uLong x, int nbByte));
    local int ziplocal_putValue (file, x, nbByte)
        FILE *file;
        uLong x;
        int nbByte;
    {
        unsigned char buf[4];
        int n;
        for (n = 0; n < nbByte; n++) {
            buf[n] = (unsigned char)(x & 0xff);
            x >>= 8;
        }
        if (fwrite(buf,nbByte,1,file)!=1)
            return ZIP_ERRNO;
        else
            return ZIP_OK;
    }

    local void ziplocal_putValue_inmemory OF((void* dest, uLong x, int nbByte));
    local void ziplocal_putValue_inmemory (dest, x, nbByte)
        void* dest;
        uLong 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;
        }
    }
    /****************************************************************************/

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

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

    extern zipFile ZEXPORT zipOpen (pathname, append)
        const char *pathname;
        int append;
    {
        zip_internal ziinit;
        zip_internal* zi;

        ziinit.filezip = fopen(pathname,(append == 0) ? "wb" : "ab");
        if (ziinit.filezip == NULL)
            return NULL;
        ziinit.begin_pos = ftell(ziinit.filezip);
        ziinit.in_opened_file_inzip = 0;
        ziinit.ci.stream_initialised = 0;
        ziinit.number_entry = 0;
        init_linkedlist(&(ziinit.central_dir));

        zi = (zip_internal*)ALLOC(sizeof(zip_internal));
        if (zi==NULL)
        {
            fclose(ziinit.filezip);
            return NULL;
        }

        *zi = ziinit;
        return (zipFile)zi;
    }

    extern int ZEXPORT zipOpenNewFileInZip (file, filename, zipfi,
                                            extrafield_local, size_extrafield_local,
                                            extrafield_global, size_extrafield_global,
                                            comment, method, level)
        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;
    {
        zip_internal* zi;
        uInt size_filename;
        uInt size_comment;
        uInt i;
        int err = ZIP_OK;

        if (file == NULL)
            return ZIP_PARAMERROR;
        if ((method!=0) && (method!=Z_DEFLATED))
            return ZIP_PARAMERROR;

        zi = (zip_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 = strlen(comment);

        size_filename = strlen(filename);

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

        zi->ci.flag = 0;
        if ((level==8) || (level==9))
          zi->ci.flag |= 2;
        if ((level==2))
          zi->ci.flag |= 4;
        if ((level==1))
          zi->ci.flag |= 6;

        zi->ci.crc32 = 0;
        zi->ci.method = method;
        zi->ci.stream_initialised = 0;
        zi->ci.pos_in_buffered_data = 0;
        zi->ci.pos_local_header = ftell(zi->filezip);
        zi->ci.size_centralheader = SIZECENTRALHEADER + size_filename +
                                          size_extrafield_global + size_comment;
        zi->ci.central_header = (char*)ALLOC((uInt)zi->ci.size_centralheader);

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

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

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

        ziplocal_putValue_inmemory(zi->ci.central_header+42,(uLong)zi->ci.pos_local_header,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) = *(filename+i);
        if (zi->ci.central_header == NULL)
            return ZIP_INTERNALERROR;

        /* write the local header */
        err = ziplocal_putValue(zi->filezip,(uLong)LOCALHEADERMAGIC,4);

        if (err==ZIP_OK)
            err = ziplocal_putValue(zi->filezip,(uLong)20,2);/* version needed to extract */
        if (err==ZIP_OK)
            err = ziplocal_putValue(zi->filezip,(uLong)zi->ci.flag,2);

        if (err==ZIP_OK)
            err = ziplocal_putValue(zi->filezip,(uLong)zi->ci.method,2);

        if (err==ZIP_OK)
            err = ziplocal_putValue(zi->filezip,(uLong)zi->ci.dosDate,4);

        if (err==ZIP_OK)
            err = ziplocal_putValue(zi->filezip,(uLong)0,4); /* crc 32, unknown */
        if (err==ZIP_OK)
            err = ziplocal_putValue(zi->filezip,(uLong)0,4); /* compressed size, unknown */
        if (err==ZIP_OK)
            err = ziplocal_putValue(zi->filezip,(uLong)0,4); /* uncompressed size, unknown */

        if (err==ZIP_OK)
            err = ziplocal_putValue(zi->filezip,(uLong)size_filename,2);

        if (err==ZIP_OK)
            err = ziplocal_putValue(zi->filezip,(uLong)size_extrafield_local,2);

        if ((err==ZIP_OK) && (size_filename>0))
            if (fwrite(filename,(uInt)size_filename,1,zi->filezip)!=1)
                    err = ZIP_ERRNO;

        if ((err==ZIP_OK) && (size_extrafield_local>0))
            if (fwrite(extrafield_local,(uInt)size_extrafield_local,1,zi->filezip)
                                                                               !=1)
                    err = ZIP_ERRNO;

        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;

        if ((err==ZIP_OK) && (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;

            err = deflateInit2(&zi->ci.stream, level,
                   Z_DEFLATED, -MAX_WBITS, DEF_MEM_LEVEL, 0);

            if (err==Z_OK)
                zi->ci.stream_initialised = 1;
        }

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

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

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

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

        zi->ci.stream.next_in = buf;
        zi->ci.stream.avail_in = len;
        zi->ci.crc32 = crc32(zi->ci.crc32,buf,len);

        while ((err==ZIP_OK) && (zi->ci.stream.avail_in>0))
        {
            if (zi->ci.stream.avail_out == 0)
            {
                if (fwrite(zi->ci.buffered_data,(uInt)zi->ci.pos_in_buffered_data,1,zi->filezip)
                                                                               !=1)
                    err = ZIP_ERRNO;
                zi->ci.pos_in_buffered_data = 0;
                zi->ci.stream.avail_out = (uInt)Z_BUFSIZE;
                zi->ci.stream.next_out = zi->ci.buffered_data;
            }

            if (zi->ci.method == Z_DEFLATED)
            {
                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;
                }
            }
        }

        return 0;
    }

    extern int ZEXPORT zipCloseFileInZip (file)
        zipFile file;
    {
        zip_internal* zi;
        int err=ZIP_OK;

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

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

        if (zi->ci.method == Z_DEFLATED)
            while (err==ZIP_OK)
        {
            uLong uTotalOutBefore;
            if (zi->ci.stream.avail_out == 0)
            {
                if (fwrite(zi->ci.buffered_data,(uInt)zi->ci.pos_in_buffered_data,1,zi->filezip)
                                                                               !=1)
                    err = ZIP_ERRNO;
                zi->ci.pos_in_buffered_data = 0;
                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) ;
        }

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

        if ((zi->ci.pos_in_buffered_data>0) && (err==ZIP_OK))
            if (fwrite(zi->ci.buffered_data,(uInt)zi->ci.pos_in_buffered_data,1,zi->filezip)
                                                                           !=1)
                err = ZIP_ERRNO;

        if ((zi->ci.method == Z_DEFLATED) && (err==ZIP_OK))
        {
            err=deflateEnd(&zi->ci.stream);
            zi->ci.stream_initialised = 0;
        }

        ziplocal_putValue_inmemory(zi->ci.central_header+16,(uLong)zi->ci.crc32,4); /*crc*/
        ziplocal_putValue_inmemory(zi->ci.central_header+20,
                                    (uLong)zi->ci.stream.total_out,4); /*compr size*/
        ziplocal_putValue_inmemory(zi->ci.central_header+24,
                                    (uLong)zi->ci.stream.total_in,4); /*uncompr size*/

        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)
        {
            long cur_pos_inzip = ftell(zi->filezip);
    	    if (fseek(zi->filezip,
                      zi->ci.pos_local_header + 14,SEEK_SET)!=0)
    		    err = ZIP_ERRNO;

            if (err==ZIP_OK)
                err = ziplocal_putValue(zi->filezip,(uLong)zi->ci.crc32,4); /* crc 32, unknown */

            if (err==ZIP_OK) /* compressed size, unknown */
                err = ziplocal_putValue(zi->filezip,(uLong)zi->ci.stream.total_out,4);

            if (err==ZIP_OK) /* uncompressed size, unknown */
                err = ziplocal_putValue(zi->filezip,(uLong)zi->ci.stream.total_in,4);

    	    if (fseek(zi->filezip,
                      cur_pos_inzip,SEEK_SET)!=0)
    		    err = ZIP_ERRNO;
        }

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

        return err;
    }

    extern int ZEXPORT zipClose (file, global_comment)
        zipFile file;
        const char* global_comment;
    {
        zip_internal* zi;
        int err = 0;
        uLong size_centraldir = 0;
        uLong centraldir_pos_inzip ;
        uInt size_global_comment;
        if (file == NULL)
            return ZIP_PARAMERROR;
        zi = (zip_internal*)file;

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

        if (global_comment==NULL)
            size_global_comment = 0;
        else
            size_global_comment = strlen(global_comment);

        centraldir_pos_inzip = ftell(zi->filezip);
        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 (fwrite(ldi->data,(uInt)ldi->filled_in_this_block,
                                            1,zi->filezip) !=1 )
                        err = ZIP_ERRNO;

                size_centraldir += ldi->filled_in_this_block;
                ldi = ldi->next_datablock;
            }
        }
        free_datablock(zi->central_dir.first_block);

        if (err==ZIP_OK) /* Magic End */
            err = ziplocal_putValue(zi->filezip,(uLong)ENDHEADERMAGIC,4);

        if (err==ZIP_OK) /* number of this disk */
            err = ziplocal_putValue(zi->filezip,(uLong)0,2);

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

        if (err==ZIP_OK) /* total number of entries in the central dir on this disk */
            err = ziplocal_putValue(zi->filezip,(uLong)zi->number_entry,2);

        if (err==ZIP_OK) /* total number of entries in the central dir */
            err = ziplocal_putValue(zi->filezip,(uLong)zi->number_entry,2);

        if (err==ZIP_OK) /* size of the central directory */
            err = ziplocal_putValue(zi->filezip,(uLong)size_centraldir,4);

        if (err==ZIP_OK) /* offset of start of central directory with respect to the
    	                        starting disk number */
            err = ziplocal_putValue(zi->filezip,(uLong)centraldir_pos_inzip ,4);

        if (err==ZIP_OK) /* zipfile comment length */
            err = ziplocal_putValue(zi->filezip,(uLong)size_global_comment,2);

        if ((err==ZIP_OK) && (size_global_comment>0))
            if (fwrite(global_comment,(uInt)size_global_comment,1,zi->filezip) !=1 )
                    err = ZIP_ERRNO;
        fclose(zi->filezip);
        TRYFREE(zi);

        return err;
    }

Currently browsing [compression_0_1.zip] (31,945 bytes) - [Compression/Zip/zip.h] - (5,240 bytes)

    /* zip.h -- IO for compress .zip files using zlib
       Version 0.15 alpha, Mar 19th, 1998,

       Copyright (C) 1998 Gilles Vollant

       This unzip package allow creates .ZIP file, compatible with PKZip 2.04g
         WinZip, InfoZip tools and compatible.
       Encryption and multi volume ZipFile (span) are not supported.
       Old compressions used by old PKZip 1.x are not supported

      For uncompress .zip file, look at unzip.h

       THIS IS AN ALPHA VERSION. AT THIS STAGE OF DEVELOPPEMENT, SOMES API OR STRUCTURE
       CAN CHANGE IN FUTURE VERSION !!
       I WAIT FEEDBACK at mail info@winimage.com
       Visit also http://www.winimage.com/zLibDll/zip.htm for evolution

       Condition of use and distribution are the same than zlib :

      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
      freely, subject to the following restrictions:

      1. The origin of this software must not be misrepresented; you must not
         claim that you wrote the original software. If you use this software
         in a product, an acknowledgment in the product documentation would be
         appreciated but is not required.
      2. Altered source versions must be plainly marked as such, and must not be
         misrepresented as being the original software.
      3. This notice may not be removed or altered from any source distribution.

    */

    /* for more info about .ZIP format, see
          ftp://ftp.cdrom.com/pub/infozip/doc/appnote-970311-iz.zip
       PkWare has also a specification at :
          ftp://ftp.pkware.com/probdesc.zip
    */

    #ifndef _zip_H
    #define _zip_H

    #ifdef __cplusplus
    extern "C" {
    #endif

    #ifndef _ZLIB_H
    #include "zlib.h"
    #endif

    #if defined(STRICTZIP) || defined(STRICTZIPUNZIP)
    /* like the STRICT of WIN32, we define a pointer that cannot be converted
        from (void*) without cast */
    typedef struct TagzipFile__ { int unused; } zipFile__;
    typedef zipFile__ *zipFile;
    #else
    typedef voidp zipFile;
    #endif

    #define ZIP_OK                                  (0)
    #define ZIP_ERRNO               (Z_ERRNO)
    #define ZIP_PARAMERROR                  (-102)
    #define ZIP_INTERNALERROR               (-104)

    /* tm_zip contain date/time info */
    typedef struct tm_zip_s
    {
    	uInt tm_sec;            /* seconds after the minute - [0,59] */
    	uInt tm_min;            /* minutes after the hour - [0,59] */
    	uInt tm_hour;           /* hours since midnight - [0,23] */
    	uInt tm_mday;           /* day of the month - [1,31] */
    	uInt tm_mon;            /* months since January - [0,11] */
    	uInt tm_year;           /* years - [1980..2044] */
    } tm_zip;

    typedef struct
    {
    	tm_zip      tmz_date;       /* date in understandable format           */
        uLong       dosDate;       /* if dos_date == 0, tmu_date is used      */
    /*    uLong       flag;        */   /* general purpose bit flag        2 bytes */

        uLong       internal_fa;    /* internal file attributes        2 bytes */
        uLong       external_fa;    /* external file attributes        4 bytes */
    } zip_fileinfo;

    extern zipFile ZEXPORT zipOpen OF((const char *pathname, int append));
    /*
      Create a zipfile.
    	 pathname contain on Windows NT a filename like "c:\\zlib\\zlib111.zip" or on
    	   an Unix computer "zlib/zlib111.zip".
    	 if the file pathname exist and append=1, the zip will be created at the end
    	   of the file. (useful if the file contain a self extractor code)
    	 If the zipfile cannot be opened, the return value is NULL.
         Else, the return value is a zipFile Handle, usable with other function
    	   of this zip package.

    */

    extern int ZEXPORT zipOpenNewFileInZip OF((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));
    /*
      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 the the local header
      if extrafield_global!=NULL and size_extrafield_global>0, extrafield_global
        contains the extrafield data the the local 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)
    */

    extern int ZEXPORT zipWriteInFileInZip OF((zipFile file,
    					   const voidp buf,
    					   unsigned len));
    /*
      Write data in the zipfile
    */

    extern int ZEXPORT zipCloseFileInZip OF((zipFile file));
    /*
      Close the current file in the zipfile
    */

    extern int ZEXPORT zipClose OF((zipFile file,
    				const char* global_comment));
    /*
      Close the zipfile
    */

    #ifdef __cplusplus
    }
    #endif

    #endif /* _zip_H */

Currently browsing [compression_0_1.zip] (31,945 bytes) - [Compression/Zip/zipstream.h] - (311 bytes)

    //------------------------------------------------------------------------------
    // (c) 2001 Gottfried Chen
    //------------------------------------------------------------------------------

    #ifndef ZIPSTREAM_H
    #define ZIPSTREAM_H

    #include "izipstream.h"
    #include "ozipstream.h"

    #endif // ZIPSTREAM_H

Currently browsing [compression_0_1.zip] (31,945 bytes) - [Compression/ZipTest/Main.cpp] - (1,411 bytes)

    #include "../zip/zipstream.h"
    #include <iostream>
    #include <string>

    void test()
    {
        using namespace zip;
        using namespace std;

        //-----------
        // Test output
        //-----------

        ozipfile out("test.zip");
        ozipstream oasc(out, "test.txt");
        oasc<<123<<endl;
        oasc<<"hello"<<endl;
        oasc<<3.14f<<endl;
        // Close file in zip, since only one concurrent file allowed.
        oasc.close();

        ozipstream obin(out, "data/test.bin", ios_base::out|ios_base::binary);
        //obin<<"s";

        char othree[100];
        memset(othree, 3, 100);
        obin.write(othree, 100);
        obin.close();

        // Close zip, so that it can be reopened.
        out.close();

        //-----------
        // Test input
        //-----------

        izipfile in("test.zip");
        izipstream iasc(in, "test.txt");
        int a;
        string b;
        float c;
        iasc>>a;
        cout<<a<<endl;
        iasc>>b;
        cout<<b<<endl;
        iasc>>c;
        cout<<c<<endl;
        // Close file in zip, since only one concurrent file allowed.
        iasc.close();

        izipstream ibin(in, "data/test.bin", ios_base::in|ios_base::binary);
        char ithree[100];
        ibin.read(ithree, 100);
        if (memcmp(othree, ithree, 100) == 0)
            cout<<"Buffers are equal\n";
        else
            cout<<"Buffers don't match\n";

        // Destructor closes rest.
    }

    int main()
    {
        test();
        return 0;
    }

The zip file viewer built into the Developer Toolbox made use of the zlib library, as well as the zlibdll source additions.

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