C语言对文件压缩，解压操作

这是压缩代码：

int Compress( char *ppathname, char *pfilename )
{
    int iRet = 0;
    char command[128 + 1];

    iRet = SplitFilename( pfilename, ppathname );
    if (iRet)
    {
       return -1;
    }

    memset(command, 0x00, sizeof(command));

    strcpy( command, "gzip " );

    strcat( command, pfilename );

    /*printf("command:[%s]\n", command);*/
    iRet = system( command );
    if ( 127 == iRet )
    {
        return -1;
    }else if( -1 == iRet )
    {
        return -1;
    }

    return 0;
}

这是解压代码：

int Extract( char *pfilename, char *ppathname )
{
   int iRet = 0;
   char command[128 + 1];

   iRet = SplitFilename( pfilename, ppathname );
   if (iRet)
   {
      return -1;
   }

   memset(command, 0x00, sizeof(command));

   strcpy(command, "gzip -d ");

   strcat(command, pfilename);

   iRet = system( command );
   if (127 == iRet)
   {
      return -1;
   } else if (-1 == iRet)
   {
      return -1;
   }

   return 0;
}

对文件目录进行分割

int SplitFilename( char *filename, char *ppathname )
{
      char *p=NULL;

      strtok(ppathname, "/");

      while (p=strtok(NULL, "/"))
      {
        strcpy(filename,p);
      }

      return 0;
}