1：到zlib官网上下载zlib，本文下载的是1.2.8的版本。
2：进行./configure,然后make。
3：进入zlib库中的contrib/minizip/路径下make，生成的minizip是进行压缩，miniunz是进行解压zip文件。
下面讲解一下miniunz.c中的代码：
1 /* 2 miniunz.c 3 Version 1.1, February 14h, 2010 4 sample part of the MiniZip project - ( http://www.winimage.com/zLibDll/minizip.html ) 5 6 Copyright (C) 1998-2010 Gilles Vollant (minizip) ( http://www.winimage.com/zLibDll/minizip.html ) 7 8 Modifications of Unzip for Zip64 9 Copyright (C) 2007-2008 Even Rouault 10 11 Modifications for Zip64 support on both zip and unzip 12 Copyright (C) 2009-2010 Mathias Svensson ( http://result42.com ) 13 */ 14 15 #if (!defined(_WIN32)) && (!defined(WIN32)) && (!defined(__APPLE__)) 16 #ifndef __USE_FILE_OFFSET64 17 #define __USE_FILE_OFFSET64 18 #endif 19 #ifndef __USE_LARGEFILE64 20 #define __USE_LARGEFILE64 21 #endif 22 #ifndef _LARGEFILE64_SOURCE 23 #define _LARGEFILE64_SOURCE 24 #endif 25 #ifndef _FILE_OFFSET_BIT 26 #define _FILE_OFFSET_BIT 64 27 #endif 28 #endif 29 30 #ifdef __APPLE__ 31 // In darwin and perhaps other BSD variants off_t is a 64 bit value, hence no need for specific 64 bit functions 32 #define FOPEN_FUNC(filename, mode) fopen(filename, mode) 33 #define FTELLO_FUNC(stream) ftello(stream) 34 #define FSEEKO_FUNC(stream, offset, origin) fseeko(stream, offset, origin) 35 #else 36 #define FOPEN_FUNC(filename, mode) fopen64(filename, mode) 37 #define FTELLO_FUNC(stream) ftello64(stream) 38 #define FSEEKO_FUNC(stream, offset, origin) fseeko64(stream, offset, origin) 39 #endif 40 41 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <string.h> 45 #include <time.h> 46 #include <errno.h> 47 #include <fcntl.h> 48 49 #ifdef _WIN32 50 # include <direct.h> 51 # include <io.h> 52 #else 53 # include <unistd.h> 54 # include <utime.h> 55 #endif 56 57 58 #include "unzip.h" 59 60 #define CASESENSITIVITY (0) 61 #define WRITEBUFFERSIZE (8192) 62 #define MAXFILENAME (256) 63 64 #ifdef _WIN32 65 #define USEWIN32IOAPI 66 #include "iowin32.h" 67 #endif 68 /* 69 mini unzip, demo of unzip package 70 71 usage : 72 Usage : miniunz [-exvlo] file.zip [file_to_extract] [-d extractdir] 73 74 list the file in the zipfile, and print the content of FILE_ID.ZIP or README.TXT 75 if it exists 76 */ 77 78 79 /* change_file_date : change the date/time of a file 80 filename : the filename of the file where date/time must be modified 81 dosdate : the new date at the MSDos format (4 bytes) 82 tmu_date : the SAME new date at the tm_unz format */ 83 void change_file_date(filename,dosdate,tmu_date) 84 const char *filename; 85 uLong dosdate; 86 tm_unz tmu_date; 87 { 88 #ifdef _WIN32 89 HANDLE hFile; 90 FILETIME ftm,ftLocal,ftCreate,ftLastAcc,ftLastWrite; 91 92 hFile = CreateFileA(filename,GENERIC_READ | GENERIC_WRITE, 93 0,NULL,OPEN_EXISTING,0,NULL); 94 GetFileTime(hFile,&ftCreate,&ftLastAcc,&ftLastWrite); 95 DosDateTimeToFileTime((WORD)(dosdate>>16),(WORD)dosdate,&ftLocal); 96 LocalFileTimeToFileTime(&ftLocal,&ftm); 97 SetFileTime(hFile,&ftm,&ftLastAcc,&ftm); 98 CloseHandle(hFile); 99 #else 100 #ifdef unix || __APPLE__ 101 struct utimbuf ut; 102 struct tm newdate; 103 newdate.tm_sec = tmu_date.tm_sec; 104 newdate.tm_min=tmu_date.tm_min; 105 newdate.tm_hour=tmu_date.tm_hour; 106 newdate.tm_mday=tmu_date.tm_mday; 107 newdate.tm_mon=tmu_date.tm_mon; 108 if (tmu_date.tm_year > 1900) 109 newdate.tm_year=tmu_date.tm_year - 1900; 110 else 111 newdate.tm_year=tmu_date.tm_year ; 112 newdate.tm_isdst=-1; 113 114 ut.actime=ut.modtime=mktime(&newdate); 115 utime(filename,&ut); 116 #endif 117 #endif 118 } 119 120 121 /* mymkdir and change_file_date are not 100 % portable 122 As I don't know well Unix, I wait feedback for the unix portion */ 123 124 int mymkdir(dirname) 125 const char* dirname; 126 { 127 int ret=0; 128 #ifdef _WIN32 129 ret = _mkdir(dirname); 130 #elif unix 131 ret = mkdir (dirname,0775); 132 #elif __APPLE__ 133 ret = mkdir (dirname,0775); 134 #endif 135 return ret; 136 } 137 138 int makedir (newdir) 139 char *newdir; 140 { 141 char *buffer ; 142 char *p; 143 int len = (int)strlen(newdir); 144 145 if (len <= 0) 146 return 0; 147 148 buffer = (char*)malloc(len+1); 149 if (buffer==NULL) 150 { 151 printf("Error allocating memory "); 152 return UNZ_INTERNALERROR; 153 } 154 strcpy(buffer,newdir); 155 156 if (buffer[len-1] == '/') { 157 buffer[len-1] = ' '; 158 } 159 if (mymkdir(buffer) == 0) 160 { 161 free(buffer); 162 return 1; 163 } 164 165 p = buffer+1; 166 while (1) 167 { 168 char hold; 169 170 while(*p && *p != '\' && *p != '/') 171 p++; 172 hold = *p; 173 *p = 0; 174 if ((mymkdir(buffer) == -1) && (errno == ENOENT)) 175 { 176 printf("couldn't create directory %s ",buffer); 177 free(buffer); 178 return 0; 179 } 180 if (hold == 0) 181 break; 182 *p++ = hold; 183 } 184 free(buffer); 185 return 1; 186 } 187 188 void do_banner() 189 { 190 printf("MiniUnz 1.01b, demo of zLib + Unz package written by Gilles Vollant "); 191 printf("more info at http://www.winimage.com/zLibDll/unzip.html "); 192 } 193 194 void do_help() 195 { 196 printf("Usage : miniunz [-e] [-x] [-v] [-l] [-o] [-p password] file.zip [file_to_extr.] [-d extractdir] " 197 " -e Extract without pathname (junk paths) " 198 " -x Extract with pathname " 199 " -v list files " 200 " -l list files " 201 " -d directory to extract into " 202 " -o overwrite files without prompting " 203 " -p extract crypted file using password "); 204 } 205 206 void Display64BitsSize(ZPOS64_T n, int size_char) 207 { 208 /* to avoid compatibility problem , we do here the conversion */ 209 char number[21]; 210 int offset=19; 211 int pos_string = 19; 212 number[20]=0; 213 for (;;) { 214 number[offset]=(char)((n%10)+'0'); 215 if (number[offset] != '0') 216 pos_string=offset; 217 n/=10; 218 if (offset==0) 219 break; 220 offset--; 221 } 222 { 223 int size_display_string = 19-pos_string; 224 while (size_char > size_display_string) 225 { 226 size_char--; 227 printf(" "); 228 } 229 } 230 231 printf("%s",&number[pos_string]); 232 } 233 234 int do_list(uf) 235 unzFile uf; 236 { 237 uLong i; 238 unz_global_info64 gi; 239 int err; 240 241 err = unzGetGlobalInfo64(uf,&gi); 242 if (err!=UNZ_OK) 243 printf("error %d with zipfile in unzGetGlobalInfo ",err); 244 printf(" Length Method Size Ratio Date Time CRC-32 Name "); 245 printf(" ------ ------ ---- ----- ---- ---- ------ ---- "); 246 for (i=0;i<gi.number_entry;i++) 247 { 248 char filename_inzip[256]; 249 unz_file_info64 file_info; 250 uLong ratio=0; 251 const char *string_method; 252 char charCrypt=' '; 253 err = unzGetCurrentFileInfo64(uf,&file_info,filename_inzip,sizeof(filename_inzip),NULL,0,NULL,0); 254 if (err!=UNZ_OK) 255 { 256 printf("error %d with zipfile in unzGetCurrentFileInfo ",err); 257 break; 258 } 259 if (file_info.uncompressed_size>0) 260 ratio = (uLong)((file_info.compressed_size*100)/file_info.uncompressed_size); 261 262 /* display a '*' if the file is crypted */ 263 if ((file_info.flag & 1) != 0) 264 charCrypt='*'; 265 266 if (file_info.compression_method==0) 267 string_method="Stored"; 268 else 269 if (file_info.compression_method==Z_DEFLATED) 270 { 271 uInt iLevel=(uInt)((file_info.flag & 0x6)/2); 272 if (iLevel==0) 273 string_method="Defl:N"; 274 else if (iLevel==1) 275 string_method="Defl:X"; 276 else if ((iLevel==2) || (iLevel==3)) 277 string_method="Defl:F"; /* 2:fast , 3 : extra fast*/ 278 } 279 else 280 if (file_info.compression_method==Z_BZIP2ED) 281 { 282 string_method="BZip2 "; 283 } 284 else 285 string_method="Unkn. "; 286 287 Display64BitsSize(file_info.uncompressed_size,7); 288 printf(" %6s%c",string_method,charCrypt); 289 Display64BitsSize(file_info.compressed_size,7); 290 printf(" %3lu%% %2.2lu-%2.2lu-%2.2lu %2.2lu:%2.2lu %8.8lx %s ", 291 ratio, 292 (uLong)file_info.tmu_date.tm_mon + 1, 293 (uLong)file_info.tmu_date.tm_mday, 294 (uLong)file_info.tmu_date.tm_year % 100, 295 (uLong)file_info.tmu_date.tm_hour,(uLong)file_info.tmu_date.tm_min, 296 (uLong)file_info.crc,filename_inzip); 297 if ((i+1)<gi.number_entry) 298 { 299 err = unzGoToNextFile(uf); 300 if (err!=UNZ_OK) 301 { 302 printf("error %d with zipfile in unzGoToNextFile ",err); 303 break; 304 } 305 } 306 } 307 308 return 0; 309 } 310 311 312 int do_extract_currentfile(uf,popt_extract_without_path,popt_overwrite,password) 313 unzFile uf; 314 const int* popt_extract_without_path; 315 int* popt_overwrite; 316 const char* password; 317 { 318 char filename_inzip[256]; 319 char* filename_withoutpath; 320 char* p; 321 int err=UNZ_OK; 322 FILE *fout=NULL; 323 void* buf; 324 uInt size_buf; 325 326 unz_file_info64 file_info; 327 uLong ratio=0; 328 err = unzGetCurrentFileInfo64(uf,&file_info,filename_inzip,sizeof(filename_inzip),NULL,0,NULL,0); 329 330 if (err!=UNZ_OK) 331 { 332 printf("error %d with zipfile in unzGetCurrentFileInfo ",err); 333 return err; 334 } 335 336 size_buf = WRITEBUFFERSIZE; 337 buf = (void*)malloc(size_buf); 338 if (buf==NULL) 339 { 340 printf("Error allocating memory "); 341 return UNZ_INTERNALERROR; 342 } 343 344 p = filename_withoutpath = filename_inzip; 345 while ((*p) != ' ') 346 { 347 if (((*p)=='/') || ((*p)=='\')) 348 filename_withoutpath = p+1; 349 p++; 350 } 351 352 if ((*filename_withoutpath)==' ') 353 { // 文件夹 354 if ((*popt_extract_without_path)==0) 355 { // 创建文件夹 356 printf("creating directory: %s ",filename_inzip); 357 mymkdir(filename_inzip); 358 } 359 } 360 else 361 { 362 const char* write_filename; 363 int skip=0; 364 365 if ((*popt_extract_without_path)==0) 366 // 带有zip包中的文件路径 367 write_filename = filename_inzip; 368 else 369 // 不带有zip包中的文件路径 370 write_filename = filename_withoutpath; 371 372 // 通过密码提取当前文件，如果没有密码则password为null 373 err = unzOpenCurrentFilePassword(uf,password); 374 if (err!=UNZ_OK) 375 { 376 printf("error %d with zipfile in unzOpenCurrentFilePassword ",err); 377 } 378 379 // 提取当前文件成功，如果同名文件存在是否覆盖，popt_overwrite = 1表示无条件覆盖，popt_overwrite = 0表示不覆盖 380 if (((*popt_overwrite)==0) && (err==UNZ_OK)) 381 { 382 char rep=0; 383 FILE* ftestexist; 384 // 以只读方式打开文件 385 ftestexist = FOPEN_FUNC(write_filename,"rb"); 386 // 如果文件存在 387 if (ftestexist!=NULL) 388 { 389 fclose(ftestexist); 390 do 391 { 392 char answer[128]; 393 int ret; 394 395 // 判断是否覆盖现有文件，Y是，N否，A以后都执行覆盖 396 printf("The file %s exists. Overwrite ? [y]es, [n]o, [A]ll: ",write_filename); 397 ret = scanf("%1s",answer); 398 if (ret != 1) 399 { 400 exit(EXIT_FAILURE); 401 } 402 rep = answer[0] ; 403 if ((rep>='a') && (rep<='z')) 404 rep -= 0x20; 405 } 406 while ((rep!='Y') && (rep!='N') && (rep!='A')); 407 } 408 409 if (rep == 'N') 410 skip = 1; 411 412 if (rep == 'A') 413 *popt_overwrite=1; 414 } 415 416 // 要覆盖现有文件 417 if ((skip==0) && (err==UNZ_OK)) 418 { 419 fout=FOPEN_FUNC(write_filename,"wb"); 420 /* some zipfile don't contain directory alone before file */ 421 // 这里是一些zip包中的最上层的文件，这些文件不包含在任何文件夹中 422 if ((fout==NULL) && ((*popt_extract_without_path)==0) && 423 (filename_withoutpath!=(char*)filename_inzip)) 424 { 425 char c=*(filename_withoutpath-1); 426 *(filename_withoutpath-1)=' '; 427 makedir(write_filename); 428 *(filename_withoutpath-1)=c; 429 fout=FOPEN_FUNC(write_filename,"wb"); 430 } 431 432 if (fout==NULL) 433 { 434 printf("error opening %s ",write_filename); 435 } 436 } 437 438 if (fout!=NULL) 439 { 440 printf(" extracting: %s ",write_filename); 441 442 // 循环读取当前文件，并写入硬盘 443 do 444 { 445 err = unzReadCurrentFile(uf,buf,size_buf); 446 if (err<0) 447 { 448 printf("error %d with zipfile in unzReadCurrentFile ",err); 449 break; 450 } 451 if (err>0) 452 if (fwrite(buf,err,1,fout)!=1) 453 { 454 printf("error in writing extracted file "); 455 err=UNZ_ERRNO; 456 break; 457 } 458 } 459 while (err>0); 460 if (fout) 461 fclose(fout); 462 463 // 修改文件的时间 464 if (err==0) 465 change_file_date(write_filename,file_info.dosDate, 466 file_info.tmu_date); 467 } 468 469 if (err==UNZ_OK) 470 { 471 err = unzCloseCurrentFile (uf); 472 if (err!=UNZ_OK) 473 { 474 printf("error %d with zipfile in unzCloseCurrentFile ",err); 475 } 476 } 477 else 478 unzCloseCurrentFile(uf); /* don't lose the error */ 479 } 480 481 free(buf); 482 return err; 483 } 484 485 486 int do_extract(uf,opt_extract_without_path,opt_overwrite,password) 487 unzFile uf; 488 int opt_extract_without_path; 489 int opt_overwrite; 490 const char* password; 491 { 492 uLong i; 493 unz_global_info64 gi; 494 int err; 495 FILE* fout=NULL; 496 497 err = unzGetGlobalInfo64(uf,&gi); 498 if (err!=UNZ_OK) 499 printf("error %d with zipfile in unzGetGlobalInfo ",err); 500 501 for (i=0;i<gi.number_entry;i++) 502 { 503 if (do_extract_currentfile(uf,&opt_extract_without_path, 504 &opt_overwrite, 505 password) != UNZ_OK) 506 break; 507 508 if ((i+1)<gi.number_entry) 509 { 510 err = unzGoToNextFile(uf); 511 if (err!=UNZ_OK) 512 { 513 printf("error %d with zipfile in unzGoToNextFile ",err); 514 break; 515 } 516 } 517 } 518 519 return 0; 520 } 521 522 int do_extract_onefile(uf,filename,opt_extract_without_path,opt_overwrite,password) 523 unzFile uf; 524 const char* filename; 525 int opt_extract_without_path; 526 int opt_overwrite; 527 const char* password; 528 { 529 int err = UNZ_OK; 530 if (unzLocateFile(uf,filename,CASESENSITIVITY)!=UNZ_OK) 531 { 532 printf("file %s not found in the zipfile ",filename); 533 return 2; 534 } 535 536 if (do_extract_currentfile(uf,&opt_extract_without_path, 537 &opt_overwrite, 538 password) == UNZ_OK) 539 return 0; 540 else 541 return 1; 542 } 543 544 545 int main(argc,argv) 546 int argc; 547 char *argv[]; 548 { 549 const char *zipfilename=NULL; // zip包名 550 const char *filename_to_extract=NULL; // 指定文件名，然后在zip包中查找这个指定的文件 551 const char *password=NULL; // zip包的密码 552 char filename_try[MAXFILENAME+16] = ""; // 当zip包名无效时，则会在zip包名后加上 .zip 标志存放在此变量中，然后深度操作此名 553 int i; 554 int ret_value=0; // 返回值 555 int opt_do_list=0; // 此标志表示是否只列出zip包中的文件列表，不解压zip包 556 int opt_do_extract=1; // 此标志表示是否解压zip包 557 int opt_do_extract_withoutpath=0; // 此标志表示解压zip包时，是否需要建立zip包中相应的目录路径 558 int opt_overwrite=0; // 此标志表示解压zip包中的文件时，硬盘上已经存在此文件时，是否进行文件覆盖 559 int opt_extractdir=0; // 此标志表示是否解压到指定的目录 560 const char *dirname=NULL; 561 unzFile uf=NULL; 562 563 do_banner(); 564 // 如果运行时提供的参数不对，将显示帮助 565 if (argc==1) 566 { 567 do_help(); 568 return 0; 569 } 570 else 571 { 572 // 提取运行时输入的参数 573 for (i=1;i<argc;i++) 574 { 575 if ((*argv[i])=='-') 576 { 577 const char *p=argv[i]+1; 578 579 while ((*p)!=' ') 580 { 581 char c=*(p++); 582 if ((c=='l') || (c=='L')) 583 opt_do_list = 1; 584 if ((c=='v') || (c=='V')) 585 opt_do_list = 1; 586 if ((c=='x') || (c=='X')) 587 opt_do_extract = 1; 588 if ((c=='e') || (c=='E')) 589 opt_do_extract = opt_do_extract_withoutpath = 1; 590 if ((c=='o') || (c=='O')) 591 opt_overwrite=1; 592 if ((c=='d') || (c=='D')) 593 { 594 opt_extractdir=1; 595 dirname=argv[i+1]; 596 } 597 598 if (((c=='p') || (c=='P')) && (i+1<argc)) 599 { 600 password=argv[i+1]; 601 i++; 602 } 603 } 604 } 605 else 606 { 607 // 提取zip包名 608 if (zipfilename == NULL) 609 zipfilename = argv[i]; 610 // 指定解压后的目录路径 611 else if ((filename_to_extract==NULL) && (!opt_extractdir)) 612 filename_to_extract = argv[i] ; 613 } 614 } 615 } 616 617 // 打开zip包 618 if (zipfilename!=NULL) 619 { 620 621 # ifdef USEWIN32IOAPI 622 zlib_filefunc64_def ffunc; 623 # endif 624 625 strncpy(filename_try, zipfilename,MAXFILENAME-1); 626 /* strncpy doesnt append the trailing NULL, of the string is too long. */ 627 filename_try[ MAXFILENAME ] = ' '; 628 629 # ifdef USEWIN32IOAPI 630 fill_win32_filefunc64A(&ffunc); 631 uf = unzOpen2_64(zipfilename,&ffunc); 632 # else 633 uf = unzOpen64(zipfilename); 634 # endif 635 if (uf==NULL) 636 { 637 strcat(filename_try,".zip"); 638 # ifdef USEWIN32IOAPI 639 uf = unzOpen2_64(filename_try,&ffunc); 640 # else 641 uf = unzOpen64(filename_try); 642 # endif 643 } 644 } 645 646 if (uf==NULL) 647 { 648 printf("Cannot open %s or %s.zip ",zipfilename,zipfilename); 649 return 1; 650 } 651 printf("%s opened ",filename_try); 652 653 if (opt_do_list==1) 654 ret_value = do_list(uf); 655 else if (opt_do_extract==1) 656 { 657 // 改变当前的工作目录 658 #ifdef _WIN32 659 if (opt_extractdir && _chdir(dirname)) 660 #else 661 if (opt_extractdir && chdir(dirname)) 662 #endif 663 { 664 printf("Error changing into %s, aborting ", dirname); 665 exit(-1); 666 } 667 668 if (filename_to_extract == NULL) 669 ret_value = do_extract(uf, opt_do_extract_withoutpath, opt_overwrite, password); 670 else 671 ret_value = do_extract_onefile(uf, filename_to_extract, opt_do_extract_withoutpath, opt_overwrite, password); 672 } 673 674 unzClose(uf); 675 676 return ret_value; 677 }