使用zlib库解压*.zip文件

2024-02-21 22:58
文章标签 使用 zip 解压 zlib

本文主要是介绍使用zlib库解压*.zip文件，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

1.编辑zlib静态库

      1）实现zip文件压缩和解压的zlib库部分代码（基于zlib-1.2.5）

             这是zlib-1.2.5源码：http://download.csdn.net/download/sunxianliang1/9598009

             这是整理好的源代码（只是把需要的挑选出来，可以用vs编译成库使用）：http://download.csdn.net/download/sunxianliang1/9597996

      2）把以上整理好的代码编译成库待使用

2.zip文件的解压（支持多级目录）

1）ZipOperation.h

#ifndef ZIP_OPERATION_H
#define ZIP_OPERATION_H
#include "unzip.h"
#include <string>class ZipOperation
{
public:static bool Unzip();private:static void change_file_date(const char *filename, uLong dosdate, tm_unz tmu_date);static int mymkdir(const char* dirname);static int makedir(char *newdir);static void Display64BitsSize(ZPOS64_T n, int size_char);static int do_list(unzFile uf);static int do_extract_currentfile(unzFile uf, const int* popt_extract_without_path, int* popt_overwrite, const char* password);static int do_extract(unzFile uf, int opt_extract_without_path, int opt_overwrite, const char* password);static int do_extract_onefile(unzFile uf, const char* filename, int opt_extract_without_path, int opt_overwrite, const char* password);};#endif

2)ZipOperation.cpp

#include "ZipOperation.h"
#include <fstream>#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <errno.h>
#include <fcntl.h>
# include <direct.h>
# include <io.h>#define CASESENSITIVITY (0)
#define WRITEBUFFERSIZE (8192)
#define MAXFILENAME (256)#ifdef _WIN32
#define USEWIN32IOAPI
#include "iowin32.h"
#endifvoid ZipOperation::change_file_date(const char *filename, uLong dosdate, tm_unz tmu_date)
{
#ifdef _WIN32HANDLE 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 unixstruct 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;elsenewdate.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 ZipOperation::mymkdir(const char* dirname)
{int ret = 0;
#ifdef _WIN32ret = _mkdir(dirname);
#else
#ifdef unixret = mkdir(dirname, 0775);
#endif
#endifreturn ret;
}int ZipOperation::makedir(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\n");return UNZ_INTERNALERROR;}strcpy(buffer, newdir);if (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;
}void ZipOperation::Display64BitsSize(ZPOS64_T n, int size_char)
{/* to avoid compatibility problem , we do here the conversion */char number[21];int offset = 19;int pos_string = 19;number[20] = 0;for (;;) {number[offset] = (char)((n % 10) + '0');if (number[offset] != '0')pos_string = offset;n /= 10;if (offset == 0)break;offset--;}{int size_display_string = 19 - pos_string;while (size_char > size_display_string){size_char--;printf(" ");}}printf("%s", &number[pos_string]);
}int ZipOperation::do_list(unzFile uf)
{uLong i;unz_global_info64 gi;int err;err = unzGetGlobalInfo64(uf, &gi);if (err != UNZ_OK)printf("error %d with zipfile in unzGetGlobalInfo \n", err);printf("  Length  Method     Size Ratio   Date    Time   CRC-32     Name\n");printf("  ------  ------     ---- -----   ----    ----   ------     ----\n");for (i = 0; i<gi.number_entry; i++){char filename_inzip[256];unz_file_info64 file_info;uLong ratio = 0;const char *string_method;char charCrypt = ' ';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);break;}if (file_info.uncompressed_size>0)ratio = (uLong)((file_info.compressed_size * 100) / file_info.uncompressed_size);/* display a '*' if the file is crypted */if ((file_info.flag & 1) != 0)charCrypt = '*';if (file_info.compression_method == 0)string_method = "Stored";elseif (file_info.compression_method == Z_DEFLATED){uInt iLevel = (uInt)((file_info.flag & 0x6) / 2);if (iLevel == 0)string_method = "Defl:N";else if (iLevel == 1)string_method = "Defl:X";else if ((iLevel == 2) || (iLevel == 3))string_method = "Defl:F"; /* 2:fast , 3 : extra fast*/}elseif (file_info.compression_method == Z_BZIP2ED){string_method = "BZip2 ";}elsestring_method = "Unkn. ";Display64BitsSize(file_info.uncompressed_size, 7);printf("  %6s%c", string_method, charCrypt);Display64BitsSize(file_info.compressed_size, 7);printf(" %3lu%%  %2.2lu-%2.2lu-%2.2lu  %2.2lu:%2.2lu  %8.8lx   %s\n",ratio,(uLong)file_info.tmu_date.tm_mon + 1,(uLong)file_info.tmu_date.tm_mday,(uLong)file_info.tmu_date.tm_year % 100,(uLong)file_info.tmu_date.tm_hour, (uLong)file_info.tmu_date.tm_min,(uLong)file_info.crc, filename_inzip);if ((i + 1)<gi.number_entry){err = unzGoToNextFile(uf);if (err != UNZ_OK){printf("error %d with zipfile in unzGoToNextFile\n", err);break;}}}return 0;
}int ZipOperation::do_extract_currentfile(unzFile uf, const int* popt_extract_without_path, int* popt_overwrite, const char* password)
{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;}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;err = unzOpenCurrentFilePassword(uf, password);if (err != UNZ_OK){printf("error %d with zipfile in unzOpenCurrentFilePassword\n", err);}if (((*popt_overwrite) == 0) && (err == UNZ_OK)){char rep = 0;FILE* ftestexist;ftestexist = fopen64(write_filename, "rb");if (ftestexist != NULL){fclose(ftestexist);do{char answer[128];int ret;printf("The file %s exists. Overwrite ? [y]es, [n]o, [A]ll: ", write_filename);ret = scanf("%1s", answer);if (ret != 1){exit(EXIT_FAILURE);}rep = answer[0];if ((rep >= 'a') && (rep <= 'z'))rep -= 0x20;} while ((rep != 'Y') && (rep != 'N') && (rep != 'A'));}if (rep == 'N')skip = 1;if (rep == 'A')*popt_overwrite = 1;}if ((skip == 0) && (err == UNZ_OK)){fout = fopen64(write_filename, "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(const_cast<char*>(write_filename));*(filename_withoutpath - 1) = c;fout = fopen64(write_filename, "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 ZipOperation::do_extract(unzFile uf, int opt_extract_without_path, int opt_overwrite, const char* password)
{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) != UNZ_OK)break;if ((i + 1)<gi.number_entry){err = unzGoToNextFile(uf);if (err != UNZ_OK){printf("error %d with zipfile in unzGoToNextFile\n", err);break;}}}return 0;
}int ZipOperation::do_extract_onefile(unzFile uf, const char* filename, int opt_extract_without_path, int opt_overwrite, const char* password)
{int err = UNZ_OK;if (unzLocateFile(uf, filename, CASESENSITIVITY) != UNZ_OK){printf("file %s not found in the zipfile\n", filename);return 2;}if (do_extract_currentfile(uf, &opt_extract_without_path,&opt_overwrite,password) == UNZ_OK)return 0;elsereturn 1;
}bool ZipOperation::Unzip()
{const char *zipfilename = "E://a.zip"//压缩文件名const char *filename_to_extract=NULL;const char *password=NULL;//密码char filename_try[MAXFILENAME + 16] = "";int ret_value = 0;int opt_do_list = 0;int opt_do_extract = 1;int opt_do_extract_withoutpath = 0;int opt_overwrite = 1;int opt_extractdir = 1;const char *dirname = "E://";unzFile uf = NULL;#ifdef USEWIN32IOAPIzlib_filefunc64_def ffunc;
#endifstrncpy(filename_try, zipfilename, MAXFILENAME - 1);/* strncpy doesnt append the trailing NULL, of the string is too long. */filename_try[MAXFILENAME] = '\0';#ifdef USEWIN32IOAPIfill_win32_filefunc64A(&ffunc);uf = unzOpen2_64(zipfilename, &ffunc);
#elseuf = unzOpen64(zipfilename);
#endifif (uf == NULL){strcat(filename_try, ".zip");
#ifdef USEWIN32IOAPIuf = unzOpen2_64(filename_try, &ffunc);
#elseuf = unzOpen64(filename_try);
#endif}if (uf == NULL){printf("Cannot open %s or %s.zip\n", zipfilename, zipfilename);return false;}printf("%s opened\n", filename_try);if (opt_do_list == 1)ret_value = do_list(uf);else if (opt_do_extract == 1){
#ifdef _WIN32int ch = _chdir(dirname);if (opt_extractdir && ch)
#elseif (opt_extractdir && chdir(dirname))
#endif{printf("Error changing into %s, aborting\n", dirname);return false;}if (filename_to_extract == NULL)ret_value = do_extract(uf, opt_do_extract_withoutpath, opt_overwrite, password);elseret_value = do_extract_onefile(uf, filename_to_extract, opt_do_extract_withoutpath, opt_overwrite, password);}unzClose(uf);return true;
}

注意：解压功能就是根据源码zlib-1.2.5\contrib\minizip下的miniunz.c实现

3.压缩zip文件

       没有研究这个，不过想实现这个功能可以研究源码zlib-1.2.5\contrib\minizip下的minizip.c文件


                                    

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