使用7zip的SDK

一  去http://www.7-zip.org/sdk.html下载源代码，目前的版本是9.20

二  把包解压之后有个C目录，把下面的Alloc.c，Alloc.h，LzFind.c，LzFind.h，LzFindMt.c，LzFindMt.h，LzHash.h，LzmaDec.c，LzmaDec.h，LzmaEnc.c，LzmaEnc.h，LzmaLib.c，LzmaLib.h，Threads.c，Threads.h，Types.h拷贝出来，这些是使用lzma算法编解码的必须文件，如果想要其他算法再拷其他文件。

三  把上述文件加入工程，并在测试文件中包含LzmaLib.h，就可以种其中的函数了

 

#include <iostream>
#include <fstream>
#include <time.h>
#include <windows.h>
using namespace std;

#include "lzmalib.h"

int main(int argc, char* argv[])
{
 size_t insize = 0;
 size_t outsize = 0;
 unsigned char * inbuf = 0;
 unsigned char * outbuf = 0;
 unsigned char * destbuf = 0;
 
 if(argc == 1)
 {
  cout<<"please input infile"<<endl;
  return -1;
 }

 ifstream infile;
    cout<<argv[1]<<endl;
    infile.open (argv[1], ios::binary );
 //infile.open ("stocktrace.dat", ios::binary );

  // get length of file:
  infile.seekg (0, ios::end);
  insize = infile.tellg();
  infile.seekg (0, ios::beg);

  // allocate memory:
  inbuf = new unsigned char [insize];

  // read data as a block:
  infile.read ((char *)inbuf,insize);
  infile.close();

  unsigned propsSize = LZMA_PROPS_SIZE;
  outsize = insize;
  outbuf = new unsigned char [outsize];
  LARGE_INTEGER t1,t2,feq;
QueryPerformanceFrequency(&feq);//每秒跳动次数
QueryPerformanceCounter(&t1);//测前跳动次数
  //unsigned long start_tick = GetTickCount();//精确到毫秒

  int res = LzmaCompress(
    &outbuf[LZMA_PROPS_SIZE], &outsize,
    &inbuf[0], insize,
    &outbuf[0], &propsSize,
    0, 1<<14, -1, -1, -1, 5, -1);

  //unsigned long end_tick = GetTickCount();

QueryPerformanceCounter(&t2);//测后跳动次数
double d=((double)t2.QuadPart-(double)t1.QuadPart)/((double)feq.QuadPart);//时间差秒,*1000000就是微妙

cout<<"compress time is "<< d*1000000<<endl;

  ofstream outfile;
  outfile.open ("lzma.test", ios::binary );
  outfile.write((char *)outbuf,outsize+LZMA_PROPS_SIZE);
  outfile.close();
 

  cout<<"insize is "<<insize <<"  outsize is "<<outsize+LZMA_PROPS_SIZE<<"   compress ratio is "<<((float)(outsize+LZMA_PROPS_SIZE)/(float)insize)<<endl;

  //cout<<"return value is "<<res<<" encode time is "<<end_tick - start_tick<<" ms"<<endl;

 
  size_t destlen = 2*insize;
  destbuf = new unsigned char [destlen];
  outsize = outsize;

 // end_tick = GetTickCount();
  QueryPerformanceFrequency(&feq);//每秒跳动次数
  QueryPerformanceCounter(&t1);//测前跳动次数

  res = LzmaUncompress(&destbuf[0], &destlen, &outbuf[LZMA_PROPS_SIZE], &outsize,
  &outbuf[0], LZMA_PROPS_SIZE);

  QueryPerformanceCounter(&t2);//测后跳动次数
  d=((double)t2.QuadPart-(double)t1.QuadPart)/((double)feq.QuadPart);//时间差秒

  //unsigned long last_tick = GetTickCount();

  ofstream dstfile;
  dstfile.open ("lzma.org", ios::binary );
  dstfile.write((char *)destbuf,destlen);
  dstfile.close();

 

  cout<<"res is "<<res<<"  dest len is "<<destlen<<endl;
  cout<<"decode time is "<<d*1000000<<endl;

   delete [] inbuf;
   delete [] outbuf;
   delete [] destbuf;

  //assert(propsSize == LZMA_PROPS_SIZE);
  //assert(res == SZ_OK);

  return 0;
 
}

 

 

这个事最简单的例子，另外http://asawicki.info/news_1368_lzma_sdk_-_how_to_use.html 做了比较详细的描述