【转】C++ ZLib压缩与解压缩

原文：http://www.cnblogs.com/chuncn/archive/2011/03/23/1992481.html

 

#include "stdafx.h"
#include "zlib.h"
#include <iostream>
using namespace std;
#pragma comment(lib,"zlib.lib")

int _tmain(int argc, _TCHAR* argv[])
{
    int err;
    Byte compr[200], uncompr[200]; //足够大
    uLong comprLen, uncomprLen;
    const char* hello = "1234567890"; //原文

    uLong len = strlen(hello);// + 1;
    comprLen = sizeof(compr) / sizeof(compr[0]);

    err = compress(compr, &comprLen, (const Bytef*)hello, len);

    if (err != Z_OK)
    {
        cerr << "压缩错误: " << err << '\n ';
    }

    cout << "原文长度: " << len << "\n压缩后长度:" << comprLen << '\n ';
    strcpy((char*)uncompr, "garbage ");

    err = uncompress(uncompr, &uncomprLen, compr, comprLen);

    if (err != Z_OK)
    {
        cerr << "解压错误: " << err << '\n ';
    }

    cout << "\n原文长度:" << len << "\n解压后长度:" << uncomprLen << '\n ';

    if (strcmp((char*)uncompr, hello))
    {
        cerr << "\n解压失败!!!\n ";
    }
    else
    {
        cout << "\n解压成功:" << (char*)uncompr;
    }

    FILE *f= fopen("d:\\b1.bin","wb");
    fwrite(compr,comprLen,1,f);
    fclose(f);

    getchar();
    return 0;
}