安装zlib 1.2.3.tar.gz：
$wget http://www.zlib.net/zlib-1.2.3.tar.gz
$tar -xvzf zlib-1.2.3.tar.gz
$cd zlib-1.2.3.tar.gz
$./configure
$make
$sudo make install
安装好之后，就可以用了。
zlibmgr.h 文件：
#ifndef _ZLIBMGR
#define _ZLIBMGR
#define MAXBUFFERSIZE 200000
#include <iostream>
#include <string.h>
#include <stdlib.h>
#include <zlib.h>
using namespace std;
class CZlibMgr
{
public:
CZlibMgr();
~CZlibMgr();
bool Compress(const char* pcContentBuf, char* pcCompBuf, unsigned long& ulCompLen); // 压缩，pcContentBuf 要压缩的内容 pcCompBuf 压缩后的内容 ulCompLen 压缩后的长度
bool UnCompress(const char* pcCompBuf, char* pcUnCompBuf, unsigned long ulCompLen); // 解压,pcCompBuf 压缩的内容, pcUnCompBuf 解压后的内容 ulCompLen 压缩内容的长度
private:
Byte compr[MAXBUFFERSIZE];
Byte uncompr[MAXBUFFERSIZE];
};
CZlibMgr::CZlibMgr()
{
}
CZlibMgr::~CZlibMgr()
{
}
bool CZlibMgr::Compress(const char* pcContentBuf, char* pcCompBuf, unsigned long& ulCompLen)
{
if (pcContentBuf == NULL)
{
return false;
}
if (strlen(pcContentBuf) == 0)
{
return false;
}
memset(compr, 0, MAXBUFFERSIZE);
uLong comprLen;
int err;
uLong len = strlen(pcContentBuf);
comprLen = sizeof(compr) / sizeof(compr[0]);
err = compress(compr, &comprLen, (const Bytef*)pcContentBuf, len);
if (err != Z_OK)
{
cout << "compess error: " << err << endl;
return false;
}
cout << "orignal size: " << len << " , compressed size : " << comprLen << endl;
memcpy(pcCompBuf, compr, comprLen);
ulCompLen = comprLen;
return true;
}
bool CZlibMgr::UnCompress(const char* pcCompBuf, char* pcUnCompBuf, unsigned long ulCompLen)
{
if (pcCompBuf == NULL)
{
cout <<__FUNCTION__ << "================> pcCompBuf is null please to check " << endl;
return false;
}
if (strlen(pcCompBuf) == 0)
{
cout <<__FUNCTION__ << "strlen(pcCompBuf) == 0 ========================> " << endl;
return false;
}
memset(uncompr, 0, MAXBUFFERSIZE);
uLong uncomprLen = MAXBUFFERSIZE;
int err;
err = uncompress(uncompr, &uncomprLen, (const Bytef *)pcCompBuf, ulCompLen);
if (err != Z_OK)
{
cout << "uncompess error: " << err << endl;
return false;
}
cout << "compress size: " << ulCompLen << " uncompressed size : " << uncomprLen << endl;
memcpy(pcUnCompBuf, uncompr, uncomprLen);
return true;
}
CZlibMgr g_kZlibMgr;
#endif
使用的例子：
#include <string.h>
#include <stdlib.h>
#include <iostream>
#include <zlib.h>
#include "zlibmgr.h"
using namespace std;
extern CZlibMgr g_kZlibMgr;
int main()
{
cout << sizeof(long) << " " << sizeof(int) << endl;
long uu1 = 10000;
unsigned int i1 = 0;
i1 = (unsigned int)uu1;
cout << i1 << endl;
int err;
Byte compr[200000], uncompr[200000];// big enough
memset(compr, 0, 200000);
memset(uncompr, 0, 200000);
uLong comprLen, uncomprLen;
const char* hello = "guosyidlsldkksldkieeeeeeeee211111111111111111111111111111111111\"";
unsigned long u1, u2;
u1 = 0;
u2 = 0;
char sOutBuf[8096];
g_kZlibMgr.Compress(hello, sOutBuf, u1);
cout << "======================> " << u1 << endl;
char sUnCompressBuf[8096];
memset(sUnCompressBuf, 0, sizeof(sUnCompressBuf));
g_kZlibMgr.UnCompress(sOutBuf, sUnCompressBuf, u1);
cout << sUnCompressBuf << endl;
}
采用如下方式进行编译：
g++ -o testzlib testzlib.cpp -lz
大家可以把zlibmgr直接拿过去用，压缩效果很好，通常都在一半以上。