text: #pragma once
  
  // UNZIPPING functions -- for unzipping.
  // This file is a repackaged form of extracts from the zlib code available
  // at www.gzip.org/zlib, by Jean-Loup Gailly and Mark Adler. The original
  // copyright notice may be found in unzip.cpp. The repackaging was done
  // by Lucian Wischik to simplify and extend its use in Windows/C++. Also
  // encryption and unicode filenames have been added.
  
  
  #ifndef _zip_H
  DECLARE_HANDLE(HZIP);
  #endif
  // An HZIP identifies a zip file that has been opened
  
  typedef DWORD ZRESULT;
  // return codes from any of the zip functions. Listed later.
  
  typedef struct
  { int index;                 // index of this file within the zip
    TCHAR name[MAX_PATH];      // filename within the zip
    DWORD attr;                // attributes, as in GetFileAttributes.
    FILETIME atime,ctime,mtime;// access, create, modify filetimes
    long comp_size;            // sizes of item, compressed and uncompressed. These
    long unc_size;             // may be -1 if not yet known (e.g. being streamed in)
  } ZIPENTRY;
  
  
  HZIP OpenZip(const TCHAR *fn, const char *password);
  HZIP OpenZip(void *z,unsigned int len, const char *password);
  HZIP OpenZipHandle(HANDLE h, const char *password);
  // OpenZip - opens a zip file and returns a handle with which you can
  // subsequently examine its contents. You can open a zip file from:
  // from a pipe:             OpenZipHandle(hpipe_read,0);
  // from a file (by handle): OpenZipHandle(hfile,0);
  // from a file (by name):   OpenZip("c:\\test.zip","password");
  // from a memory block:     OpenZip(bufstart, buflen,0);
  // If the file is opened through a pipe, then items may only be
  // accessed in increasing order, and an item may only be unzipped once,
  // although GetZipItem can be called immediately before and after unzipping
  // it. If it's opened in any other way, then full random access is possible.
  // Note: pipe input is not yet implemented.
  // Note: zip passwords are ascii, not unicode.
  // Note: for windows-ce, you cannot close the handle until after CloseZip.
  // but for real windows, the zip makes its own copy of your handle, so you
  // can close yours anytime.
  
  ZRESULT GetZipItem(HZIP hz, int index, ZIPENTRY *ze);
  // GetZipItem - call this to get information about an item in the zip.
  // If index is -1 and the file wasn't opened through a pipe,
  // then it returns information about the whole zipfile
  // (and in particular ze.index returns the number of index items).
  // Note: the item might be a directory (ze.attr & FILE_ATTRIBUTE_DIRECTORY)
  // See below for notes on what happens when you unzip such an item.
  // Note: if you are opening the zip through a pipe, then random access
  // is not possible and GetZipItem(-1) fails and you can't discover the number
  // of items except by calling GetZipItem on each one of them in turn,
  // starting at 0, until eventually the call fails. Also, in the event that
  // you are opening through a pipe and the zip was itself created into a pipe,
  // then then comp_size and sometimes unc_size as well may not be known until
  // after the item has been unzipped.
  
  ZRESULT FindZipItem(HZIP hz, const TCHAR *name, bool ic, int *index, ZIPENTRY *ze);
  // FindZipItem - finds an item by name. ic means 'insensitive to case'.
  // It returns the index of the item, and returns information about it.
  // If nothing was found, then index is set to -1 and the function returns
  // an error code.
  
  ZRESULT UnzipItem(HZIP hz, int index, const TCHAR *fn);
  ZRESULT UnzipItem(HZIP hz, int index, void *z,unsigned int len);
  ZRESULT UnzipItemHandle(HZIP hz, int index, HANDLE h);
  // UnzipItem - given an index to an item, unzips it. You can unzip to:
  // to a pipe:             UnzipItemHandle(hz,i, hpipe_write);
  // to a file (by handle): UnzipItemHandle(hz,i, hfile);
  // to a file (by name):   UnzipItem(hz,i, ze.name);
  // to a memory block:     UnzipItem(hz,i, buf,buflen);
  // In the final case, if the buffer isn't large enough to hold it all,
  // then the return code indicates that more is yet to come. If it was
  // large enough, and you want to know precisely how big, GetZipItem.
  // Note: zip files are normally stored with relative pathnames. If you
  // unzip with ZIP_FILENAME a relative pathname then the item gets created
  // relative to the current directory - it first ensures that all necessary
  // subdirectories have been created. Also, the item may itself be a directory.
  // If you unzip a directory with ZIP_FILENAME, then the directory gets created.
  // If you unzip it to a handle or a memory block, then nothing gets created
  // and it emits 0 bytes.
  ZRESULT SetUnzipBaseDir(HZIP hz, const TCHAR *dir);
  // if unzipping to a filename, and it's a relative filename, then it will be relative to here.
  // (defaults to current-directory).
  
  
  ZRESULT CloseZip(HZIP hz);
  // CloseZip - the zip handle must be closed with this function.
  
  unsigned int FormatZipMessage(ZRESULT code, TCHAR *buf,unsigned int len);
  // FormatZipMessage - given an error code, formats it as a string.
  // It returns the length of the error message. If buf/len points
  // to a real buffer, then it also writes as much as possible into there.
  
  
  // These are the result codes:
  #define ZR_OK         0x00000000     // nb. the pseudo-code zr-recent is never returned,
  #define ZR_RECENT     0x00000001     // but can be passed to FormatZipMessage.
  // The following come from general system stuff (e.g. files not openable)
  #define ZR_GENMASK    0x0000FF00
  #define ZR_NODUPH     0x00000100     // couldn't duplicate the handle
  #define ZR_NOFILE     0x00000200     // couldn't create/open the file
  #define ZR_NOALLOC    0x00000300     // failed to allocate some resource
  #define ZR_WRITE      0x00000400     // a general error writing to the file
  #define ZR_NOTFOUND   0x00000500     // couldn't find that file in the zip
  #define ZR_MORE       0x00000600     // there's still more data to be unzipped
  #define ZR_CORRUPT    0x00000700     // the zipfile is corrupt or not a zipfile
  #define ZR_READ       0x00000800     // a general error reading the file
  #define ZR_PASSWORD   0x00001000     // we didn't get the right password to unzip the file
  // The following come from mistakes on the part of the caller
  #define ZR_CALLERMASK 0x00FF0000
  #define ZR_ARGS       0x00010000     // general mistake with the arguments
  #define ZR_NOTMMAP    0x00020000     // tried to ZipGetMemory, but that only works on mmap zipfiles, which yours wasn't
  #define ZR_MEMSIZE    0x00030000     // the memory size is too small
  #define ZR_FAILED     0x00040000     // the thing was already failed when you called this function
  #define ZR_ENDED      0x00050000     // the zip creation has already been closed
  #define ZR_MISSIZE    0x00060000     // the indicated input file size turned out mistaken
  #define ZR_PARTIALUNZ 0x00070000     // the file had already been partially unzipped
  #define ZR_ZMODE      0x00080000     // tried to mix creating/opening a zip 
  // The following come from bugs within the zip library itself
  #define ZR_BUGMASK    0xFF000000
  #define ZR_NOTINITED  0x01000000     // initialisation didn't work
  #define ZR_SEEK       0x02000000     // trying to seek in an unseekable file
  #define ZR_NOCHANGE   0x04000000     // changed its mind on storage, but not allowed
  #define ZR_FLATE      0x05000000     // an internal error in the de/inflation code
  
  
  
  
  
  // e.g.
  //
  // SetCurrentDirectory("c:\\docs\\stuff");
  // HZIP hz = OpenZip("c:\\stuff.zip",0);
  // ZIPENTRY ze; GetZipItem(hz,-1,&ze); int numitems=ze.index;
  // for (int i=0; i<numitems; i++)
  // { GetZipItem(hz,i,&ze);
  //   UnzipItem(hz,i,ze.name);
  // }
  // CloseZip(hz);
  //
  //
  // HRSRC hrsrc = FindResource(hInstance,MAKEINTRESOURCE(1),RT_RCDATA);
  // HANDLE hglob = LoadResource(hInstance,hrsrc);
  // void *zipbuf=LockResource(hglob);
  // unsigned int ziplen=SizeofResource(hInstance,hrsrc);
  // HZIP hz = OpenZip(zipbuf, ziplen, 0);
  //   - unzip to a membuffer -
  // ZIPENTRY ze; int i; FindZipItem(hz,"file.dat",true,&i,&ze);
  // char *ibuf = new char[ze.unc_size];
  // UnzipItem(hz,i, ibuf, ze.unc_size);
  // delete[] ibuf;
  //   - unzip to a fixed membuff -
  // ZIPENTRY ze; int i; FindZipItem(hz,"file.dat",true,&i,&ze);
  // char ibuf[1024]; ZRESULT zr=ZR_MORE; unsigned long totsize=0;
  // while (zr==ZR_MORE)
  // { zr = UnzipItem(hz,i, ibuf,1024);
  //   unsigned long bufsize=1024; if (zr==ZR_OK) bufsize=ze.unc_size-totsize;
  //   totsize+=bufsize;
  // }
  //   - unzip to a pipe -
  // HANDLE hwrite; HANDLE hthread=CreateWavReaderThread(&hwrite);
  // int i; ZIPENTRY ze; FindZipItem(hz,"sound.wav",true,&i,&ze);
  // UnzipItemHandle(hz,i, hwrite);
  // CloseHandle(hwrite);
  // WaitForSingleObject(hthread,INFINITE);
  // CloseHandle(hwrite); CloseHandle(hthread);
  //   - finished -
  // CloseZip(hz);
  // // note: no need to free resources obtained through Find/Load/LockResource
  //
  //
  // SetCurrentDirectory("c:\\docs\\pipedzipstuff");
  // HANDLE hread,hwrite; CreatePipe(&hread,&hwrite,0,0);
  // CreateZipWriterThread(hwrite);
  // HZIP hz = OpenZipHandle(hread,0);
  // for (int i=0; ; i++)
  // { ZIPENTRY ze;
  //   ZRESULT zr=GetZipItem(hz,i,&ze); if (zr!=ZR_OK) break; // no more
  //   UnzipItem(hz,i, ze.name);
  // }
  // CloseZip(hz);
  //
  //
  
  
  // Now we indulge in a little skullduggery so that the code works whether
  // the user has included just zip or both zip and unzip.
  // Idea: if header files for both zip and unzip are present, then presumably
  // the cpp files for zip and unzip are both present, so we will call
  // one or the other of them based on a dynamic choice. If the header file
  // for only one is present, then we will bind to that particular one.
  ZRESULT CloseZipU(HZIP hz);
  unsigned int FormatZipMessageU(ZRESULT code, TCHAR *buf,unsigned int len);
  bool IsZipHandleU(HZIP hz);
  #ifdef _zip_H
  #undef CloseZip
  #define CloseZip(hz) (IsZipHandleU(hz)?CloseZipU(hz):CloseZipZ(hz))
  #else
  #define CloseZip CloseZipU
  #define FormatZipMessage FormatZipMessageU
  #endif
  
  struct hzip_traits
  {
  	static HZIP invalid() throw()
  	{    
  		return nullptr;  
  	}
  	static void close(HZIP value) throw()
  	{    
  		CloseZip(value);
  	}
  };
  