实战-在win32环境下进行zlib编程2[原创]

//用zlib实现压缩与解压缩
//在winxpsp2+devc++4.9.9.2实现
//链接参数中加入-lz
//将zlib1.dll加入程序目录
//kzip功能是压缩文件,kunzip是解压缩文件
//仅限于对单个文件的压缩与解压缩
＃i nclude
＃i nclude
＃i nclude
＃i nclude

using namespace std;
void kzip(char *inFile,char *outFile)
{
 FILE *FileIn=fopen(inFile,"rb");
 FILE *FileOut=fopen(outFile,"wb");
 fseek(FileIn,0,SEEK_END);
 unsigned long FileInSize=ftell(FileIn);
 void *RawDataBuff=malloc(FileInSize);
 void *CompDataBuff=NULL;
 uLongf CompBuffSize=(uLongf)(FileInSize+(FileInSize*0.1)+12);
 CompDataBuff=malloc((size_t)(CompBuffSize));
 fseek(FileIn,0,SEEK_SET);
 fread(RawDataBuff,FileInSize,1,FileIn);
 uLongf DestBuffSize;
 compress2((Bytef*)CompDataBuff,(uLongf*)&DestBuffSize,(const Bytef*)RawDataBuff,(uLongf)FileInSize,Z_BEST_COMPRESSION);
 fwrite(CompDataBuff,DestBuffSize,1,FileOut);
}
void kunzip(char *inFile,char *outFile)
{
 //the input file, this is the output file from part one
 FILE *FileIn = fopen(inFile, "rb");

 //output file
 FILE *FileOut = fopen(outFile, "wb");

 //get the file size of the input file
 fseek(FileIn, 0, SEEK_END);
 unsigned long FileInSize = ftell(FileIn);

 //buffers for the raw and uncompressed data
 void *RawDataBuff = malloc(FileInSize);
 void *UnCompDataBuff = NULL;

 //read in the contents of the file into the source buffer
 fseek(FileIn, 0, SEEK_SET);
 fread(RawDataBuff, FileInSize, 1, FileIn);
 //allocate a buffer big enough to hold the uncompressed data, we can cheat here
 //because we know the file size of the original
 uLongf UnCompSize = 482000;
 UnCompDataBuff = malloc(UnCompSize);

 //all data we require is ready so compress it into the source buffer, the exact
 //size will be stored in UnCompSize
 uncompress((Bytef*)UnCompDataBuff, &UnCompSize, (const Bytef*)RawDataBuff, FileInSize);

 //write the decompressed data to disk
 fwrite(UnCompDataBuff, UnCompSize, 1, FileOut);
}
int main(int argc, char *argv[])
{
 printf("1、压缩\n2、解压缩\n");
 int n=getchar();
 if (n==1)
 {
  kzip("in.jpeg","out.dat");
 }
 else
 {
  kunzip("Out.dat","in.jpeg"); 
 }
 
    system("PAUSE");
    return EXIT_SUCCESS;
}