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zip.h
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zip.h
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#ifndef _zip_H
#define _zip_H
// 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