zlib、minizip的安装和使用

1.zlib安装和测试

git clone https://github.com/madler/zlib.git
cd zlib
./configure --prefix=xxx # 设置安装路径为xxx
make test     # 编译
make install  # 将头文件和库文件安装到/home/myname/softwares/zlib中

测试代码test.cpp（参考：链接）：

#include "zconf.h"
#include "zlib.h"
#include <iostream>
#include <cstring>
using namespace std;

 
int main()
{
	int err;
	Byte compr[200],uncompr[200];
	uLong comprLen,uncomprLen;
	const char* hello = "1213135454646544665456465465457877874655312333131";
 
	uLong len = strlen(hello)+1;
	comprLen = sizeof(compr)/sizeof(compr[0]);
 
	err = compress(compr,&comprLen,(const Bytef*)hello,len);
 
	if(err != Z_OK){
		cerr<<"compress error: "<<err<<endl;
		exit(1);
	}
	cout<<"original size: "<<len<<" ,compressed size: "<<comprLen<<endl;
	strcpy((char*)uncompr,"garbage");
 
	err = uncompress(uncompr,&uncomprLen,compr,comprLen);
	if(err != Z_OK){
		cerr<<"uncompress error: "<<err<<endl;
		exit(1);
	}else
	{
		cout<<"uncompress() succeed: "<<endl;
		cout<<(char*)uncompr<<endl;
	}
	return 0;
}

编译运行：

g++ test.cpp -o test  -I xxx/include/ -L xxx/lib/ -lz 

2.minizip安装和测试

直接使用zlib似乎有些困难，minizip封装了zlib，在zlib项目的contrib/minizip中。

cd contrib/minizip
make

编译生成的ioapi.o、zip.o和unzip.o，是我们使用minizip所需的。我将ioapi.o、zip.o和unzip.o改名为libioapi.a、libzip.a和libunzip.a，并放入xxx/lib。将contrib/minizip下所有.h文件放入xxx/include。使用如下编译命令链接minizip所需的库文件：
编译命令：

g++ test.cpp  -o test  -I xxx/include/  -L xxx/lib/  -l ioapi -l unzip -l  zip -lz 

-lz要放在最后面，这样ioapi、unzip、zip才可以找到zlib，如果不放在最后面编译的时候会出现很多变量未定义的情况。

测试程序test.cpp（参考：链接）：

#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include "unzip.h"

#define dir_delimter '/'
#define MAX_FILENAME 512
#define READ_SIZE 8192

int main( int argc, char **argv )
{
    if ( argc < 2 )
    {
        printf( "usage:\n%s {file to unzip}\n", argv[ 0 ] );
        return -1;
    }

    // Open the zip file
    unzFile zipfile = unzOpen64( argv[ 1 ] );
    if ( zipfile == NULL )
    {
        printf( "%s: not found\n" );
        return -1;
    }

    // Get info about the zip file
    unz_global_info global_info;
    if ( unzGetGlobalInfo( zipfile, &global_info ) != UNZ_OK )
    {
        printf( "could not read file global info\n" );
        unzClose( zipfile );
        return -1;
    }

    // Buffer to hold data read from the zip file.
    char read_buffer[ READ_SIZE ];

    // Loop to extract all files
    uLong i;
    for ( i = 0; i < global_info.number_entry; ++i )
    {
        // Get info about current file.
        unz_file_info file_info;
        char filename[ MAX_FILENAME ];
        if ( unzGetCurrentFileInfo(
            zipfile,
            &file_info,
            filename,
            MAX_FILENAME,
            NULL, 0, NULL, 0 ) != UNZ_OK )
        {
            printf( "could not read file info\n" );
            unzClose( zipfile );
            return -1;
        }

        // Check if this entry is a directory or file.
        const size_t filename_length = strlen( filename );
        if ( filename[ filename_length-1 ] == dir_delimter )
        {
            // Entry is a directory, so create it.
            printf( "dir:%s\n", filename );
            mkdir( filename ,0755);
        }
        else
        {
            // Entry is a file, so extract it.
            printf( "file:%s\n", filename );
            if ( unzOpenCurrentFile( zipfile ) != UNZ_OK )
            {
                printf( "could not open file\n" );
                unzClose( zipfile );
                return -1;
            }

            // Open a file to write out the data.
            FILE *out = fopen( filename, "wb" );
            if ( out == NULL )
            {
                printf( "could not open destination file\n" );
                unzCloseCurrentFile( zipfile );
                unzClose( zipfile );
                return -1;
            }

            int error = UNZ_OK;
            do    
            {
                error = unzReadCurrentFile( zipfile, read_buffer, READ_SIZE );
                if ( error < 0 )
                {
                    printf( "error %d\n", error );
                    unzCloseCurrentFile( zipfile );
                    unzClose( zipfile );
                    return -1;
                }

                // Write data to file.
                if ( error > 0 )
                {
                    fwrite( read_buffer, error, 1, out ); // You should check return of fwrite...
                }
            } while ( error > 0 );

            fclose( out );
        }

        unzCloseCurrentFile( zipfile );

        // Go the the next entry listed in the zip file.
        if ( ( i+1 ) < global_info.number_entry )
        {
            if ( unzGoToNextFile( zipfile ) != UNZ_OK )
            {
                printf( "cound not read next file\n" );
                unzClose( zipfile );
                return -1;
            }
        }
    }

    unzClose( zipfile );

    return 0;
}

编译和运行：

g++ test.cpp  -o test  -I xxx/include/  -L xxx/lib/  -l ioapi -l unzip -l  zip -lz 
./test hello.zip