consistent code with panda

direct/src/plugin/p3dMultifileReader.cxx

@@ -160,21 +160,16 @@ read_header(const string &pathname) {
 
   char this_header[_header_size];
   _in.seekg(0);
-  _in.read(this_header, _header_size);
-  if (_in.fail() || _in.gcount() != (unsigned)_header_size) {
-    nout
-      << "Unable to read Multifile header " << pathname << ".\n";
-    return false;
-  }
 
   // Here's a special case: if the multifile begins with a hash
-  // character, then we skip at least 6 characters, and continue
-  // reading and discarding lines of ASCII text, until we come across
-  // a nonempty line that does not begin with a hash character.  This
-  // allows a P3D application (which is a multifile) to be run
-  // directly on the command line on Unix-based systems.
-  if (this_header[0] == '#') {
-    int ch = '#';
+  // character, then we continue reading and discarding lines of ASCII
+  // text, until we come across a nonempty line that does not begin
+  // with a hash character.  This allows a P3D application (which is a
+  // multifile) to be run directly on the command line on Unix-based
+  // systems.
+  int ch = _in.get();
+
+  if (ch == '#') {
     while (ch != EOF && ch == '#') {
       // Skip to the end of the line.
       while (ch != EOF && ch != '\n') {
@@ -185,10 +180,14 @@ read_header(const string &pathname) {
         ch = _in.get();
       }
     }
+  }
 
-    // Now fill up the header.
-    this_header[0] = ch;
-    _in.read(this_header + 1, _header_size - 1);
+  // Now read the actual Multifile header.
+  this_header[0] = ch;
+  _in.read(this_header + 1, _header_size - 1);
+  if (_in.fail() || _in.gcount() != (unsigned)(_header_size - 1)) {
+    nout << "Unable to read Multifile header: " << pathname << "\n";
+    return false;
   }
 
   if (memcmp(this_header, _header, _header_size) != 0) {