[zlib]

场景:

1. 解压文件一般用在下载了一个zip文件之后解压，或者分析某个文件需要解压的操作上.

2. 解压文件，特别是解压带文件夹的zip文件往往系统没有提供这类Win32 API,当然C#自带库能解压, 当然这里只讨论C/C++, 像C#和Java这种开挂的标准库不在考虑范围内.

3. zlib解压文件的使用例子在 contrib\minizip 例子里. 这里基本是直接提取miniunz.c 的代码进行封装解压即可, 只是改了下支持中文路径.

主文件 zip_util.cpp

#include "stdafx.h"#include "zip_util.h"
#include "unzip.h"#include <iostream>
#include <string>
#include <algorithm>
#include <stdlib.h>#include <zlib.h>
#include "ioapi.h"
#include "iowin32.h"
#include "wrap_object.h"using namespace std;#define CASESENSITIVITY (0)
#define WRITEBUFFERSIZE (8192)
#define MAXFILENAME (256)unzFile ZipUtil::UnzOpen64(const wchar_t* path)
{zlib_filefunc64_def ffunc;  fill_win32_filefunc64W(&ffunc);  unzFile zf = unzOpen2_64(path,&ffunc);return zf;
}char* ConvertUnicodeToUtf8(const wchar_t* unicode)  
{  if(unicode == NULL){return strdup("\0");}int len;  len = WideCharToMultiByte(CP_UTF8, 0,unicode, -1, NULL, 0, NULL, NULL);  char *szUtf8 = (char*)malloc(len + 1);  memset(szUtf8, 0, len + 1);  WideCharToMultiByte(CP_UTF8, 0,unicode, -1, szUtf8, len, NULL,NULL);  return szUtf8;  
}wchar_t* ConvertUtf8ToUnicode(const char* utf8)
{if(!utf8){wchar_t* buf = (wchar_t*)malloc(2);memset(buf,0,2);return buf;}int nLen = ::MultiByteToWideChar(CP_UTF8,MB_ERR_INVALID_CHARS,(LPCSTR)utf8,-1,NULL,0);//返回需要的unicode长度  WCHAR * wszUNICODE = new WCHAR[nLen+1];  memset(wszUNICODE, 0, nLen * 2 + 2);  nLen = MultiByteToWideChar(CP_UTF8, 0, (LPCSTR)utf8, -1, wszUNICODE, nLen);    //把utf8转成unicodereturn wszUNICODE;
}void change_file_date( const char *filename,uLong dosdate,tm_unz tmu_date)
{HANDLE hFile;FILETIME ftm,ftLocal,ftCreate,ftLastAcc,ftLastWrite;wchar_t* filenamew = ConvertUtf8ToUnicode(filename);hFile = CreateFile(filenamew,GENERIC_READ | GENERIC_WRITE,0,NULL,OPEN_EXISTING,0,NULL);GetFileTime(hFile,&ftCreate,&ftLastAcc,&ftLastWrite);DosDateTimeToFileTime((WORD)(dosdate>>16),(WORD)dosdate,&ftLocal);LocalFileTimeToFileTime(&ftLocal,&ftm);SetFileTime(hFile,&ftm,&ftLastAcc,&ftm);CloseHandle(hFile);free(filenamew);}int mymkdir(const char* dirname)
{wchar_t* dirnamew = ConvertUtf8ToUnicode(dirname);int res = CreateDirectory(dirnamew,NULL);free(dirnamew);return res;
}int makedir (const char *newdir)
{char *buffer ;char *p;int  len = (int)strlen(newdir);if (len <= 0)return 0;buffer = (char*)malloc(len+1);memset(buffer,0,len+1);if (buffer==NULL){printf("Error allocating memory\n");return UNZ_INTERNALERROR;}strcpy(buffer,newdir);if (buffer[len-1] == '/' || buffer[len-1] == '\\') {buffer[len-1] = '\0';}if (mymkdir(buffer) == 0){free(buffer);return 1;}p = buffer+1;while (1){char hold;while(*p && *p != '\\' && *p != '/')p++;hold = *p;*p = 0;if ((mymkdir(buffer) == -1) && (errno == ENOENT)){printf("couldn't create directory %s\n",buffer);free(buffer);return 0;}if (hold == 0)break;*p++ = hold;}free(buffer);return 1;
}int do_extract_currentfile(unzFile uf,const int* popt_extract_without_path,int* popt_overwrite,const char* password,const char* dir)
{char filename_inzip[256];char* filename_withoutpath;char* p;int err=UNZ_OK;FILE *fout=NULL;void* buf;uInt size_buf;unz_file_info64 file_info;uLong ratio=0;err = unzGetCurrentFileInfo64(uf,&file_info,filename_inzip,sizeof(filename_inzip),NULL,0,NULL,0);if (err!=UNZ_OK){printf("error %d with zipfile in unzGetCurrentFileInfo\n",err);return err;}size_buf = WRITEBUFFERSIZE;buf = (void*)malloc(size_buf);if (buf==NULL){printf("Error allocating memory\n");return UNZ_INTERNALERROR;}std::string dir1(dir);dir1.append(filename_inzip);strncpy(filename_inzip,dir1.c_str(),sizeof(filename_inzip));p = filename_withoutpath = filename_inzip;while ((*p) != '\0'){if (((*p)=='/') || ((*p)=='\\'))filename_withoutpath = p+1;p++;}if ((*filename_withoutpath)=='\0'){if ((*popt_extract_without_path)==0){printf("creating directory: %s\n",filename_inzip);mymkdir(filename_inzip);}}else{const char* write_filename;int skip=0;if ((*popt_extract_without_path)==0)write_filename = filename_inzip;elsewrite_filename = filename_withoutpath;wchar_t* write_filenamew = ConvertUtf8ToUnicode(write_filename);WrapMalloc wm_filename(write_filenamew);err = unzOpenCurrentFilePassword(uf,password);if (err!=UNZ_OK){printf("error %d with zipfile in unzOpenCurrentFilePassword\n",err);}if ((skip==0) && (err==UNZ_OK)){fout=_wfopen(write_filenamew,L"wb");/* some zipfile don't contain directory alone before file */if ((fout==NULL) && ((*popt_extract_without_path)==0) &&(filename_withoutpath!=(char*)filename_inzip)){char c=*(filename_withoutpath-1);*(filename_withoutpath-1)='\0';makedir(write_filename);*(filename_withoutpath-1)=c;fout = _wfopen(write_filenamew,L"wb");}if (fout==NULL){printf("error opening %s\n",write_filename);}}if (fout!=NULL){printf(" extracting: %s\n",write_filename);do{err = unzReadCurrentFile(uf,buf,size_buf);if (err<0){printf("error %d with zipfile in unzReadCurrentFile\n",err);break;}if (err>0)if (fwrite(buf,err,1,fout)!=1){printf("error in writing extracted file\n");err=UNZ_ERRNO;break;}}while (err>0);if (fout)fclose(fout);if (err==0)change_file_date(write_filename,file_info.dosDate,file_info.tmu_date);}if (err==UNZ_OK){err = unzCloseCurrentFile (uf);if (err!=UNZ_OK){printf("error %d with zipfile in unzCloseCurrentFile\n",err);}}elseunzCloseCurrentFile(uf); /* don't lose the error */}free(buf);return err;
}int do_extract(	unzFile uf,
int opt_extract_without_path,
int opt_overwrite,const char* password,const char* dir)
{uLong i;unz_global_info64 gi;int err;FILE* fout=NULL;err = unzGetGlobalInfo64(uf,&gi);if (err!=UNZ_OK)printf("error %d with zipfile in unzGetGlobalInfo \n",err);for (i=0;i<gi.number_entry;i++){if (do_extract_currentfile(uf,&opt_extract_without_path,&opt_overwrite,password,dir) != UNZ_OK)return 0;if ((i+1)<gi.number_entry){err = unzGoToNextFile(uf);if (err!=UNZ_OK){printf("error %d with zipfile in unzGoToNextFile\n",err);return 0;}}}return 1;
}bool ZipUtil::UnzipFile(std::wstring zip_file,std::wstring unzip_dir)
{if(unzip_dir[unzip_dir.size()-1] != L'\\'){unzip_dir.append(L"\\");}int err = UNZ_OK;                 // error statusuInt size_buf = WRITEBUFFERSIZE;  // byte size of buffer to store raw csv datavoid* buf;                        // the bufferstring sout;                      // output stringschar filename_inzip[256];         // for unzGetCurrentFileInfounz_file_info file_info;          // for unzGetCurrentFileInfounzFile uf = UnzOpen64(zip_file.c_str()); // open zipfile streamif (uf==NULL) {wcerr << "Cannot open " << zip_file << endl;return false;} // file is openCreateDirectory(unzip_dir.c_str(),NULL);char* utf8 = ConvertUnicodeToUtf8(unzip_dir.c_str());int ret_value = do_extract(uf,0,0,NULL,utf8);unzClose(uf);free(utf8);return ret_value;
}

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