From: Bonita.Montero@gmail.com   
      
   Am 06.12.2025 um 02:05 schrieb Michael Sanders:   
   > Am I close? Missing anything you'd consider to be (or not) needed?   
   >   
   >    
   >   
   > /*   
   >   * Checks if a file is likely a binary by examining its content   
   >   * for NULL bytes (0x00) or unusual control characters.   
   >   * Returns 0 if text, 1 if binary or file open failure.   
   >   */   
   >   
   > int is_binary_file(const char *path) {   
   >      FILE *f = fopen(path, "rb");   
   >      if (!f) return 1; // cannot open file, treat as error/fail check   
   >   
   >      unsigned char buf[65536];   
   >      size_t n, i;   
   >   
   >      while ((n = fread(buf, 1, sizeof(buf), f)) > 0) {   
   >          for (i = 0; i < n; i++) {   
   >              unsigned char c = buf[i];   
   >   
   >              // 1. check for the NULL byte (strong indicator of binary data)   
   >              if (c == 0x00) {   
   >                  fclose(f);   
   >                  return 1; // IS binary   
   >              }   
   >   
   >              // 2. check for C0 control codes (0x01-0x1F), excluding known   
   >              // text formatting characters: 0x09 (Tab), 0x0A (LF), 0x0D (CR)   
   >              if (c < 0x20) {   
   >                  if (c != 0x09 && c != 0x0A && c != 0x0D) {   
   >                      fclose(f);   
   >                      return 1; // IS binary (contains unexpected control   
   code)   
   >                  }   
   >              }   
   >          }   
   >      }   
   >   
   >      fclose(f);   
   >      return 0; // NOT binary   
   > }   
   >   
   Much smaller and with error handling for free:   
      
   bool binary( path pth )   
   {   
        ifstream ifs;   
        ifs.exceptions( ios_base::badbit );   
        ifs.open( pth, ios_base::binary | ios_base::ate );   
        streampos pos = ifs.tellg();   
        if( pos > (size_t)-1 ) // for 32 bit platforms with large files   
            throw ios_base::failure( "file too large", error_code(   
   (int)errc::file_too_large, generic_category() ) );   
        string buf( (size_t)pos, 0 );   
        ifs.seekg( 0 );   
        ifs.read( buf.data(), buf.size() );   
        auto check = []( unsigned char c ) { return c < 0x20 && c != '\r'   
   && c != '\n' && c != '\t'; };   
        return find_if( buf.begin(), buf.end(), check ) == buf.end();   
   }   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)