Method ConvertAttributes

Libraries/unrar/arcread.cpp:1293–1355

void Archive::ConvertAttributes()
{
#if defined(_WIN_ALL) || defined(_EMX)
  if (FileHead.HSType!=HSYS_WINDOWS)
    FileHead.FileAttr=FileHead.Dir ? 0x10 : 0x20;
#endif
#ifdef _UNIX
  // umask defines which permission bits must not be set by default
  // when creating a file or directory. The typical default value
  // for the process umask is S_IWGRP | S_IWOTH (octal 022),
  // resulting in 0644 mode for new files.
  // Normally umask is applied automatically when creating a file,
  // but we set attributes with chmod later, so we need to calculate
  // resulting attributes here. We do it only for non-Unix archives.
  // We restore native Unix attributes as is, because it can be backup.
  static mode_t mask = (mode_t) -1;

  if (mask == (mode_t) -1)
  {
    // umask call returns the current umask value. Argument (022) is not
    // really important here.
    mask = umask(022);

    // Restore the original umask value, which was changed to 022 above.
    umask(mask);
  }

  switch(FileHead.HSType)
  {
    case HSYS_WINDOWS:
      {
        // Mapping MSDOS, OS/2 and Windows file attributes to Unix.

        if (FileHead.FileAttr & 0x10) // FILE_ATTRIBUTE_DIRECTORY
        {
          // For directories we use 0777 mask.
          FileHead.FileAttr=0777 & ~mask;
        }
        else
          if (FileHead.FileAttr & 1)  // FILE_ATTRIBUTE_READONLY
          {
            // For read only files we use 0444 mask with 'w' bits turned off.
            FileHead.FileAttr=0444 & ~mask;
          }
          else
          {
            // umask does not set +x for regular files, so we use 0666
            // instead of 0777 as for directories.
            FileHead.FileAttr=0666 & ~mask;
          }
      }
      break;
    case HSYS_UNIX:
      break;
    default:
      if (FileHead.Dir)
        FileHead.FileAttr=0x41ff & ~mask;
      else