- return gz_.is_open() && is.good();
- } else {
- LYXERR(Debug::LYXLEX, "lyxlex: UNcompressed");
-
- // The check only outputs a debug message, because it triggers
- // a bug in compaq cxx 6.2, where is_open() returns 'true' for
- // a fresh new filebuf. (JMarc)
- if (fb_.is_open() || istream::off_type(is.tellg()) > 0) {
- LYXERR(Debug::LYXLEX, "Error in Lexer::setFile: "
- "file or stream already set.");
- }
- fb_.open(filename.toFilesystemEncoding().c_str(), ios::in);
- is.rdbuf(&fb_);
- name = filename.absFilename();
- lineno = 0;
- return fb_.is_open() && is.good();
+ if (!gz_.is_open() || !is.good())
+ return false;
+
+ // Skip byte order mark.
+ if (is.peek() == 0xef) {
+ is.get();
+ if (is.peek() == 0xbb) {
+ is.get();
+ LASSERT(is.get() == 0xbf, /**/);
+ } else
+ is.unget();