# zip-unzip

**Repository Path**: wjr22/zip-unzip

## Basic Information

- **Project Name**: zip-unzip
- **Description**: No description available
- **Primary Language**: Unknown
- **License**: Not specified
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 1
- **Forks**: 0
- **Created**: 2020-04-29
- **Last Updated**: 2023-06-26

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

# zip-unzip
基于C语言 跨平台zip/unzip


## zip

(1) 传统用法，从现有文件创建zip文件

    HZIP hz = CreateZip("c:\\simple1.zip",0);

    ZipAdd(hz,"znsimple.bmp", "c:\\simple.bmp");

    ZipAdd(hz,"znsimple.txt", "c:\\simple.txt");

    CloseZip(hz);

 
(2) 内存使用，从各种来源创建一个自动分配的基于内存的zip文件

    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);

    // 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);

    LDWORD writ; 
    
    WriteFile(hfz,zbuf,zlen,&writ,NULL);

    CloseHandle(hfz);

    CloseZip(hz);



(3) 句柄用于文件句柄和管道

    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);




## unzip

(1) 传统方法

	SetCurrentDirectory("c:\\docs\\stuff");

	HZIP hz = OpenZip("c:\\stuff.zip",0);

	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);
	}

	CloseZip(hz);


(2) 特殊需求

	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, 0);

	 // - unzip to a membuffer -

	ZIPENTRY ze; int i; 

	FindZipItem(hz,"file.dat",true,&i,&ze);

	char *ibuf = new char[ze.unc_size];

	UnzipItem(hz,i, ibuf, ze.unc_size);

	delete[] ibuf;

	  // - unzip to a fixed membuff -

	ZIPENTRY ze; int i; 

	FindZipItem(hz,"file.dat",true,&i,&ze);

	char ibuf[1024]; ZRESULT zr=ZR_MORE; unsigned long totsize=0;

	while (zr==ZR_MORE)

	{ 
	  zr = UnzipItem(hz,i, ibuf,1024);

	  unsigned long bufsize=1024; 
	  if (zr==ZR_OK) 
	    bufsize=ze.unc_size-totsize;

	  totsize+=bufsize;

	}

	  // - unzip to a pipe -

	HANDLE hwrite;

	HANDLE hthread=CreateWavReaderThread(&hwrite);

	int i; ZIPENTRY ze; 

	FindZipItem(hz,"sound.wav",true,&i,&ze);

	UnzipItemHandle(hz,i, hwrite);

	CloseHandle(hwrite);

	WaitForSingleObject(hthread,INFINITE);

	CloseHandle(hwrite); 

	CloseHandle(hthread);

	//   - finished -

	CloseZip(hz);

	// note: no need to free resources obtained through Find/Load/LockResource


(3) 获取zip的item

	SetCurrentDirectory("c:\\docs\\pipedzipstuff");

	HANDLE hread,hwrite; CreatePipe(&hread,&hwrite,0,0);

	CreateZipWriterThread(hwrite);

	HZIP hz = OpenZipHandle(hread,0);

	for (int i=0; ; i++)

	{ ZIPENTRY ze;

	  ZRESULT zr=GetZipItem(hz,i,&ze); 
	  if (zr!=ZR_OK) 
	  		break; // no more

	  UnzipItem(hz,i, ze.name);

	}

	CloseZip(hz);