git-svn-id: https://server.scottellis.com.au/svn/mim_plugs@16 4f64403b-2f21-0410-a795-97e2b3489a10

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+#ifndef _unzip_H

+#define _unzip_H

+

+// 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

+

+

+

+#endif // _unzip_H