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