// UNZIPPING functions -- for unzipping. // This file is a repackaged form of extracts from the zlib code available // at http://www.gzip.org/zlib, by Jean-Loup Gailly and Mark Adler. The original // copyright notice may be found in unzip.c. The repackaging was done // by Lucian Wischik to simplify and extend its use in Windows/C++. Also // encryption and Unicode filenames have been added. // An HZIP identifies a zip file that has been opened DECLARE_HANDLE(HZIP); // return codes from any of the zip functions typedef DWORD ZRESULT; // These are the result codes: #define ZR_OK 0x00000000 // 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_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_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 // parameter types #define ZIP_HANDLE 1 // expects HANDLE hFile #define ZIP_FILENAME 2 // expects TCHAR* filename #define ZIP_MEMORY 3 // expects memory buffer // 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 file (by handle): OpenZipHandle(hfile,0); // from a file (by name): OpenZipFile("c:\\test.zip","password"); // from a memory block: OpenZipMem(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. HZIP OpenZip(void *z,unsigned int len,DWORD flags,const char *password); #define OpenZipHandle(h,password) OpenZip((void*)h,0,ZIP_HANDLE,password) #define OpenZipFile(fn,password) OpenZip((void*)fn,0,ZIP_FILENAME,password) #define OpenZipMem(z,len,password) OpenZip(z,len,ZIP_MEMORY,password) // 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. 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; ZRESULT GetZipItem(HZIP hz,int index,ZIPENTRY *ze); // FindZipItem - finds an item by name. ic means 'insensitive to case'. // If index is not NULL it contains the index where the search begin on input. // 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. // name is allowed to contain wildcards. ZRESULT FindZipItem(HZIP hz, const TCHAR *name, BOOL ic, int *index, ZIPENTRY *ze); // UnzipItem - given an index to an item, unzips it. You can unzip to: // to a file (by handle): UnzipItemHandle(hz,i, hfile); // to a file (by name): UnzipItemFile(hz,i, ze.name); // to a memory block: UnzipItemMem(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 UnzipItem(HZIP hz,int index,void *dst,unsigned int len,DWORD type); #define UnzipItemHandle(hz,index,h) UnzipItem(hz,index,(void*)h,0,ZIP_HANDLE) #define UnzipItemFile(hz,index,fn) UnzipItem(hz,index,(void*)fn,0,ZIP_FILENAME) #define UnzipItemMem(hz,index,z,len) UnzipItem(hz,index,z,len,ZIP_MEMORY) // if unzipping to a filename, and it's a relative filename, then it will be relative to here. // (defaults to current-directory). ZRESULT SetUnzipBaseDir(HZIP hz,const TCHAR *dir); // CloseZip - the zip handle must be closed with this function. ZRESULT CloseZip(HZIP hz);