主要分析应用的demo,有空再分析底层实现
官方demo位于zlib-1.2.11contribminizip
对官方代码的分析
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/* miniunz.c Version 1.1, February 14h, 2010 sample part of the MiniZip project - ( http://www.winimage.com/zLibDll/minizip.html ) Copyright (C) 1998-2010 Gilles Vollant (minizip) ( http://www.winimage.com/zLibDll/minizip.html ) Modifications of Unzip for Zip64 Copyright (C) 2007-2008 Even Rouault Modifications for Zip64 support on both zip and unzip Copyright (C) 2009-2010 Mathias Svensson ( http://result42.com ) */ #if (!defined(_WIN32)) && (!defined(WIN32)) && (!defined(__APPLE__)) #ifndef __USE_FILE_OFFSET64 #define __USE_FILE_OFFSET64 #endif #ifndef __USE_LARGEFILE64 #define __USE_LARGEFILE64 #endif #ifndef _LARGEFILE64_SOURCE #define _LARGEFILE64_SOURCE #endif #ifndef _FILE_OFFSET_BIT #define _FILE_OFFSET_BIT 64 #endif #endif #ifdef __APPLE__ // In darwin and perhaps other BSD variants off_t is a 64 bit value, hence no need for specific 64 bit functions #define FOPEN_FUNC(filename, mode) fopen(filename, mode) #define FTELLO_FUNC(stream) ftello(stream) #define FSEEKO_FUNC(stream, offset, origin) fseeko(stream, offset, origin) #else #define FOPEN_FUNC(filename, mode) fopen64(filename, mode) #define FTELLO_FUNC(stream) ftello64(stream) #define FSEEKO_FUNC(stream, offset, origin) fseeko64(stream, offset, origin) #endif #include <stdio.h> #include <stdlib.h> #include <string.h> #include <time.h> #include <errno.h> #include <fcntl.h> #ifdef _WIN32 # include <direct.h> # include <io.h> #else # include <unistd.h> # include <utime.h> #endif #include "unzip.h" #define CASESENSITIVITY (0) #define WRITEBUFFERSIZE (8192) #define MAXFILENAME (256) #ifdef _WIN32 #define USEWIN32IOAPI #include "iowin32.h" #endif /* mini unzip, demo of unzip package usage : Usage : miniunz [-exvlo] file.zip [file_to_extract] [-d extractdir] list the file in the zipfile, and print the content of FILE_ID.ZIP or README.TXT if it exists */ /* change_file_date : change the date/time of a file filename : the filename of the file where date/time must be modified dosdate : the new date at the MSDos format (4 bytes) tmu_date : the SAME new date at the tm_unz format */ void change_file_date(filename,dosdate,tmu_date) const char *filename; uLong dosdate; tm_unz tmu_date; { #ifdef _WIN32 HANDLE hFile; FILETIME ftm,ftLocal,ftCreate,ftLastAcc,ftLastWrite; hFile = CreateFileA(filename,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); #else #ifdef unix || __APPLE__ struct utimbuf ut; struct tm newdate; newdate.tm_sec = tmu_date.tm_sec; newdate.tm_min=tmu_date.tm_min; newdate.tm_hour=tmu_date.tm_hour; newdate.tm_mday=tmu_date.tm_mday; newdate.tm_mon=tmu_date.tm_mon; if (tmu_date.tm_year > 1900) newdate.tm_year=tmu_date.tm_year - 1900; else newdate.tm_year=tmu_date.tm_year ; newdate.tm_isdst=-1; ut.actime=ut.modtime=mktime(&newdate); utime(filename,&ut); #endif #endif } /* mymkdir and change_file_date are not 100 % portable As I don't know well Unix, I wait feedback for the unix portion */ int mymkdir(dirname) const char* dirname; { int ret=0; #ifdef _WIN32 ret = _mkdir(dirname); #elif unix ret = mkdir (dirname,0775); #elif __APPLE__ ret = mkdir (dirname,0775); #endif return ret; } int makedir (newdir) char *newdir; { char *buffer ; char *p; int len = (int)strlen(newdir); if (len <= 0) return 0; buffer = (char*)malloc(len+1); if (buffer==NULL) { printf("Error allocating memory "); return UNZ_INTERNALERROR; } strcpy(buffer,newdir); if (buffer[len-1] == '/') { buffer[len-1] = '