xunzip.h

压缩/解压缩类源码

//
// Parameters:  hz      - handle of open zip archive
//              name    - name of file to look for inside zip archive
//              ic      - TRUE = case insensitive
//              index   - pointer to index number returned, or -1
//              ze      - pointer to a ZIPENTRY (if ANSI) or ZIPENTRYW struct
//                        (if Unicode)
//
// Returns:     ZRESULT - ZR_OK if success, otherwise some other value
//

#ifdef _UNICODE
#define FindZipItem FindZipItemW
#else
#define FindZipItem FindZipItemA
#endif

ZRESULT FindZipItemA(HZIP hz, const TCHAR *name, bool ic, int *index, ZIPENTRY *ze);
ZRESULT FindZipItemW(HZIP hz, const TCHAR *name, bool ic, int *index, ZIPENTRYW *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.


///////////////////////////////////////////////////////////////////////////////
//
// UnzipItem()
//
// Purpose:     Find item by index and unzip it
//
// Parameters:  hz      - handle of open zip archive
//              index   - index number of file to unzip
//              dst     - target file name of unzipped file
//              len     - for memory (ZIP_MEMORY. length of buffer;
//                        otherwise 0
//              flags   - indicates usage, see below;  for files, this will be
//                        ZIP_FILENAME
//
// Returns:     ZRESULT - ZR_OK if success, otherwise some other value
//

ZRESULT UnzipItem(HZIP hz, int index, void *dst, unsigned int len, DWORD flags);
// UnzipItem - given an index to an item, unzips it. You can unzip to:
// to a pipe:             UnzipItem(hz,i, hpipe_write,0,ZIP_HANDLE);
// to a file (by handle): UnzipItem(hz,i, hfile,0,ZIP_HANDLE);
// to a file (by name):   UnzipItem(hz,i, ze.name,0,ZIP_FILENAME);
// to a memory block:     UnzipItem(hz,i, buf,buflen,ZIP_MEMORY);
// 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.


///////////////////////////////////////////////////////////////////////////////
//
// CloseZip()
//
// Purpose:     Close an open zip archive
//
// Parameters:  hz      - handle to an open zip archive
//
// Returns:     ZRESULT - ZR_OK if success, otherwise some other value
//
ZRESULT CloseZip(HZIP hz);
// CloseZip - the zip handle must be closed with this function.

unsigned int FormatZipMessage(ZRESULT code, char *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
// 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,ZIP_FILENAME);
// 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,0,ZIP_FILENAME);
// }
// 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, ZIP_MEMORY);
//   - unzip to a membuffer -
// ZIPENTRY ze; int i; FindZipItem(hz,"file.dat",&i,&ze);
// char *ibuf = new char[ze.unc_size];
// UnzipItem(hz,i, ibuf, ze.unc_size,ZIP_MEMORY);
// delete[] buf;
//   - unzip to a fixed membuff -
// ZIPENTRY ze; int i; FindZipItem(hz,"file.dat",&i,&ze);
// char ibuf[1024]; ZIPRESULT zr=ZR_MORE; unsigned long totsize=0;
// while (zr==ZR_MORE)
// { zr = UnzipItem(hz,i, ibuf,1024,ZIP_MEMORY);
//   unsigned long bufsize=1024; if (zr==ZR_OK) bufsize=ze.unc_size-totsize;
//   totsize+=bufsize;
// }
//   - unzip to a pipe -
// HANDLE hthread=CreateWavReaderThread(&hread,&hwrite);
// FindZipItem(hz,"sound.wav",&i,&ze);
// UnzipItem(hz,i, hwrite,0,ZIP_HANDLE);
// CloseHandle(hwrite);
// WaitForSingleObject(hthread,INFINITE);
// CloseHandle(hread); 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);
// CreateZipWriterThread(hwrite);
// HZIP hz = OpenZip(hread,0,ZIP_HANDLE);
// for (int i=0; ; i++)
// { ZIPENTRY ze; ZRESULT res = GetZipItem(hz,i,&ze);
//   if (res!=ZE_OK) break; // no more
//   UnzipItem(hz,i, ze.name,0,ZIP_FILENAME);
// }
// 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.
HZIP OpenZipU(void *z,unsigned int len,DWORD flags);
ZRESULT CloseZipU(HZIP hz);
unsigned int FormatZipMessageU(ZRESULT code, char *buf,unsigned int len);
bool IsZipHandleU(HZIP hz);
#define OpenZip OpenZipU

#ifdef XZIP_H
#undef CloseZip
#define CloseZip(hz) (IsZipHandleU(hz)?CloseZipU(hz):CloseZipZ(hz))
#else
#define CloseZip CloseZipU
#define FormatZipMessage FormatZipMessageU
#endif


#endif //XUNZIP_H