zip.h.215

Posted 2020-09-20

#ifndef _zip_H #define _zip_H // #ifdef ZIP_STD #include <time.h> #define DECLARE_HANDLE(name) struct name##__ { int unused; }; typedef struct name##__ *name #ifndef MAX_PATH #define MAX_PATH 1024 #endif typedef unsigned long DWORD; typedef char TCHAR; typedef FILE* HANDLE; typedef time_t FILETIME; #endif

// ZIP functions -- for creating zip files // This file is a repackaged form of the Info-Zip source code available // at www.info-zip.org. The original copyright notice may be found in // zip.cpp. The repackaging was done by Lucian Wischik to simplify and // extend its use in Windows/C++. Also to add encryption and unicode.

#ifndef _unzip_H DECLARE_HANDLE(HZIP); #endif // An HZIP identifies a zip file that is being created

typedef DWORD ZRESULT; // return codes from any of the zip functions. Listed later.

 

HZIP CreateZip(const TCHAR *fn, const char *password); HZIP CreateZip(void *buf,unsigned int len, const char *password); HZIP CreateZipHandle(HANDLE h, const char *password); // CreateZip - call this to start the creation of a zip file. // As the zip is being created, it will be stored somewhere: // to a pipe:              CreateZipHandle(hpipe_write); // in a file (by handle):  CreateZipHandle(hfile); // in a file (by name):    CreateZip("c:\\test.zip"); // in memory:              CreateZip(buf, len); // or in pagefile memory:  CreateZip(0, len); // The final case stores it in memory backed by the system paging file, // where the zip may not exceed len bytes. This is a bit friendlier than // allocating memory with new[]: it won‘t lead to fragmentation, and the // memory won‘t be touched unless needed. That means you can give very // large estimates of the maximum-size without too much worry. // As for the password, it lets you encrypt every file in the archive. // (This api doesn‘t support per-file encryption.) // Note: because pipes don‘t allow random access, the structure of a zipfile // created into a pipe is slightly different from that created into a file // or memory. In particular, the compressed-size of the item cannot be // stored in the zipfile until after the item itself. (Also, for an item added // itself via a pipe, the uncompressed-size might not either be known until // after.) This is not normally a problem. But if you try to unzip via a pipe // as well, then the unzipper will not know these things about the item until // after it has been unzipped. Therefore: for unzippers which don‘t just write // each item to disk or to a pipe, but instead pre-allocate memory space into // which to unzip them, then either you have to create the zip not to a pipe, // or you have to add items not from a pipe, or at least when adding items // from a pipe you have to specify the length. // 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 ZipAdd(HZIP hz,const TCHAR *dstzn, const TCHAR *fn); ZRESULT ZipAdd(HZIP hz,const TCHAR *dstzn, void *src,unsigned int len); ZRESULT ZipAddHandle(HZIP hz,const TCHAR *dstzn, HANDLE h); ZRESULT ZipAddHandle(HZIP hz,const TCHAR *dstzn, HANDLE h, unsigned int len); ZRESULT ZipAddFolder(HZIP hz,const TCHAR *dstzn); // ZipAdd - call this for each file to be added to the zip. // dstzn is the name that the file will be stored as in the zip file. // The file to be added to the zip can come // from a pipe:  ZipAddHandle(hz,"file.dat", hpipe_read); // from a file:  ZipAddHandle(hz,"file.dat", hfile); // from a filen: ZipAdd(hz,"file.dat", "c:\\docs\\origfile.dat"); // from memory:  ZipAdd(hz,"subdir\\file.dat", buf,len); // (folder):     ZipAddFolder(hz,"subdir"); // Note: if adding an item from a pipe, and if also creating the zip file itself // to a pipe, then you might wish to pass a non-zero length to the ZipAddHandle // function. This will let the zipfile store the item‘s size ahead of the // compressed item itself, which in turn makes it easier when unzipping the // zipfile from a pipe.

ZRESULT ZipGetMemory(HZIP hz, void **buf, unsigned long *len); // ZipGetMemory - If the zip was created in memory, via ZipCreate(0,len), // then this function will return information about that memory block. // buf will receive a pointer to its start, and len its length. // Note: you can‘t add any more after calling this.

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 // 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. // // (1) Traditional use, creating a zipfile from existing files //     HZIP hz = CreateZip("c:\\simple1.zip",0); //     ZipAdd(hz,"znsimple.bmp", "c:\\simple.bmp"); //     ZipAdd(hz,"znsimple.txt", "c:\\simple.txt"); //     CloseZip(hz); // // (2) Memory use, creating an auto-allocated mem-based zip file from various sources //     HZIP hz = CreateZip(0,100000, 0); //     // adding a conventional file... //     ZipAdd(hz,"src1.txt",  "c:\\src1.txt"); //     // adding something from memory... //     char buf[1000]; for (int i=0; i<1000; i++) buf[i]=(char)(i&0x7F); //     ZipAdd(hz,"file.dat",  buf,1000); //     // adding something from a pipe... //     HANDLE hread,hwrite; CreatePipe(&hread,&hwrite,NULL,0); //     HANDLE hthread = CreateThread(0,0,ThreadFunc,(void*)hwrite,0,0); //     ZipAdd(hz,"unz3.dat",  hread,1000);  // the ‘1000‘ is optional. //     WaitForSingleObject(hthread,INFINITE); //     CloseHandle(hthread); CloseHandle(hread); //     ... meanwhile DWORD WINAPI ThreadFunc(void *dat) //                   { HANDLE hwrite = (HANDLE)dat; //                     char buf[1000]={17}; //                     DWORD writ; WriteFile(hwrite,buf,1000,&writ,NULL); //                     CloseHandle(hwrite); //                     return 0; //                   } //     // and now that the zip is created, let‘s do something with it: //     void *zbuf; unsigned long zlen; ZipGetMemory(hz,&zbuf,&zlen); //     HANDLE hfz = CreateFile("test2.zip",GENERIC_WRITE,0,0,CREATE_ALWAYS,FILE_ATTRIBUTE_NORMAL,0); //     DWORD writ; WriteFile(hfz,zbuf,zlen,&writ,NULL); //     CloseHandle(hfz); //     CloseZip(hz); // // (3) Handle use, for file handles and pipes //     HANDLE hzread,hzwrite; CreatePipe(&hzread,&hzwrite,0,0); //     HANDLE hthread = CreateThread(0,0,ZipReceiverThread,(void*)hzread,0,0); //     HZIP hz = CreateZipHandle(hzwrite,0); //     // ... add to it //     CloseZip(hz); //     CloseHandle(hzwrite); //     WaitForSingleObject(hthread,INFINITE); //     CloseHandle(hthread); //     ... meanwhile DWORD WINAPI ZipReceiverThread(void *dat) //                   { HANDLE hread = (HANDLE)dat; //                     char buf[1000]; //                     while (true) //                     { DWORD red; ReadFile(hread,buf,1000,&red,NULL); //                       // ... and do something with this zip data we‘re receiving //                       if (red==0) break; //                     } //                     CloseHandle(hread); //                     return 0; //                   }

 

// 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 CloseZipZ(HZIP hz); unsigned int FormatZipMessageZ(ZRESULT code, char *buf,unsigned int len); bool IsZipHandleZ(HZIP hz); #ifdef _unzip_H #undef CloseZip #define CloseZip(hz) (IsZipHandleZ(hz)?CloseZipZ(hz):CloseZipU(hz)) #else #define CloseZip CloseZipZ #define FormatZipMessage FormatZipMessageZ #endif

 

#endif