file.cpp

该文件流操作函数

CDir::CDir()
{
 this->bOpened = false;
 this->bNext = false;
#ifdef WIN32
 dp = INVALID_HANDLE_VALUE;
#else
 dp = NULL;
#endif
}
CDir::~CDir()
{
 Close();
}
bool CDir::OpenDirectory(const char* pathname)
{
 this->strDirectory = pathname;
 if ( strDirectory[strDirectory.length()-1] != '\\' &&
  strDirectory[strDirectory.length()-1] != '/' )
 {
#ifdef WIN32
  strDirectory += "\\";
#else
  strDirectory += "/";
#endif
 }
#ifdef WIN32
 dp = FindFirstFile((strDirectory + "*").c_str(),&this->fp);
 if ( dp == INVALID_HANDLE_VALUE )
  return false;
#else
 dp = opendir(strDirectory.c_str());
 if ( dp == NULL )
  return false;
#endif
 this->bOpened = true;
 return true;
}
bool CDir::HasNextFile()
{
 if ( !bOpened )
  return false;
 this->strFileName = "";
#ifdef WIN32
 this->bNext = FindNextFile(dp,&fp);
 if ( bNext )
  strFileName = fp.cFileName;
#else
 struct dirent *dirp;
 dirp = readdir(dp);
 if ( dirp == NULL )
  bNext = false;
 else
 {
  bNext =true;
  strFileName = dirp->d_name;
  char filename[500];
  sprintf(filename,"%s%s",strDirectory.c_str(),strFileName.c_str());
  stat(filename,&fp);
 }
#endif
 return bNext;
}
string CDir::NextFile()
{
 return this->strFileName;
}
string CDir::GetDirectory()
{
 return this->strDirectory;
}
bool CDir::isDirectory()
{
#ifdef WIN32
 return ( fp.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY );
#else
 return ( S_ISDIR(fp.st_mode) );
#endif
}
ulong64 CDir::GetFileSize()
{
 ulong64 filesize;
 filesize.HighFileSize = 0;
 filesize.LowFileSize = 0;
#ifdef WIN32
 filesize.HighFileSize = fp.nFileSizeHigh;
 filesize.LowFileSize = fp.nFileSizeLow;
#else
 filesize.LowFileSize = fp.st_size & 0xFFFFFFFF;
#ifdef _64BIT_
 filesize.HighFileSize = fp.st_size >> 8 ;
#endif
#endif
 return filesize;
}
void CDir::Close()
{
#ifdef WIN32
 if ( dp != INVALID_HANDLE_VALUE )
  FindClose(dp);
 dp = INVALID_HANDLE_VALUE;
#else
 if ( dp != NULL )
  closedir(dp);
 dp = NULL;
#endif
 bOpened = false;
}
/*
  class CFileFilter
  ?表示任意一个字节
  *表示任意长度的字节
*/
CFileFilter::~CFileFilter()
{
}
CFileFilter::CFileFilter(const string& filter)
{
 filematchname = filter;
}
bool CFileFilter::isMatch(const string& filename)
{
 int oldstate = -1;
 int iFilterBeginIndex = 0,iFileNameIndex =0;
 char curch=0,prevch=0,firstch = 0;
 for ( iFilterBeginIndex = 0 ; iFilterBeginIndex < filematchname.length(); iFilterBeginIndex++)
 {
  if ( iFileNameIndex >= filename.length() )
   return false;
  curch = filematchname[iFilterBeginIndex];
  switch ( curch )
  {
   case '?' :
    iFileNameIndex++;
    break;
   case '*' :
    oldstate = iFilterBeginIndex;
    break;
   default :
    if ( prevch == '*' || prevch == 0 )
     firstch = curch;
    if ( curch != filename[iFileNameIndex] )
    {
     if ( oldstate == -1 )
      return false;
     else
     {
      if ( firstch == filename[iFileNameIndex] )
       iFileNameIndex --;
      iFilterBeginIndex = oldstate;
     }
    }
    iFileNameIndex++;
  }
  prevch = curch;
 }
 //出现文件名还有剩余长度的情况
 if ( iFileNameIndex != filename.length() )
 {
  //如果后面是*的匹配则认为完全正确
  if ( curch == '*' )
   return true;
  //如果匹配规则中曾经出现*号则进行反向匹配
  else if ( oldstate != -1 )
  {
   iFileNameIndex = filename.length() - 1;
   //从文件名后进行匹配
   for ( iFilterBeginIndex--;iFilterBeginIndex >= 0;iFilterBeginIndex--,iFileNameIndex-- )
   {
    curch = filematchname[iFilterBeginIndex];
    switch ( curch )
    {
     case '?' :
      break;
     case '*' :
      return true;
     default :
      if ( curch != filename[iFileNameIndex] )
       return false;
    }
   }
   return false;
  }
  //否则认为匹配错误
  else
   return false;
 }
 return true;
}