LRF Import failed

[Joerg_Mosthaf]

I imported a lrf book from mobileread (Flatland by Edwin A Abbott - attached). When I try to convert it to epub (or mobi), calibre fails with the following message:

ERROR: Conversion Error: <b>Failed</b>: Convert book 1 of 1 (FLATLAND)

Convert book 1 of 1 (FLATLAND)
Resolved conversion options
{'asciiize': False,
 'author_sort': None,
 'authors': None,
 'base_font_size': 0.0,
 'book_producer': None,
 'chapter': u"//*[((name()='h1' or name()='h2') and re:test(., 'chapter|book|section|part\\s+', 'i')) or @class = 'chapter']",
 'chapter_mark': u'pagebreak',
 'comments': None,
 'cover': 'c:\\temp\\calibre_0.6.33_r9lsym.jpeg',
 'debug_pipeline': None,
 'disable_font_rescaling': False,
 'dont_justify': False,
 'dont_split_on_page_breaks': False,
 'extra_css': None,
 'extract_to': None,
 'flow_size': 260,
 'font_size_mapping': None,
 'footer_regex': u'(?i)(?<=<hr>)((\\s*<a name=\\d+></a>((<img.+?>)*<br>\\s*)?\\d+<br>\\s*.*?\\s*)|(\\s*<a name=\\d+></a>((<img.+?>)*<br>\\s*)?.*?<br>\\s*\\d+))(?=<br>)',
 'header_regex': u'(?i)(?<=<hr>)((\\s*<a name=\\d+></a>((<img.+?>)*<br>\\s*)?\\d+<br>\\s*.*?\\s*)|(\\s*<a name=\\d+></a>((<img.+?>)*<br>\\s*)?.*?<br>\\s*\\d+))(?=<br>)',
 'input_encoding': None,
 'input_profile': <calibre.customize.profiles.InputProfile object at 0x0281BF10>,
 'insert_blank_line': False,
 'insert_metadata': False,
 'isbn': None,
 'language': None,
 'level1_toc': None,
 'level2_toc': None,
 'level3_toc': None,
 'line_height': 0.0,
 'linearize_tables': False,
 'margin_bottom': 5.0,
 'margin_left': 5.0,
 'margin_right': 5.0,
 'margin_top': 5.0,
 'max_toc_links': 50,
 'no_chapters_in_toc': False,
 'no_default_epub_cover': False,
 'no_inline_navbars': False,
 'output_profile': <calibre.customize.profiles.KindleOutput object at 0x027C7230>,
 'page_breaks_before': u'/',
 'prefer_metadata_cover': False,
 'preprocess_html': False,
 'pretty_print': True,
 'publisher': None,
 'rating': None,
 'read_metadata_from_opf': 'c:\\temp\\calibre_0.6.33_j5t0vn.opf',
 'remove_first_image': False,
 'remove_footer': False,
 'remove_header': False,
 'remove_paragraph_spacing': False,
 'remove_paragraph_spacing_indent_size': 1.5,
 'series': None,
 'series_index': None,
 'tags': None,
 'title': None,
 'title_sort': None,
 'toc_filter': None,
 'toc_threshold': 6,
 'use_auto_toc': False,
 'verbose': 2}
InputFormatPlugin: LRF Input running
on D:\mosthafjoerg\My Dropbox\eBooks\Edwin A. Abbott\FLATLAND (690)\FLATLAND - Edwin A. Abbott.lrf
Generating XML
Python function terminated unexpectedly
  Malformed text stream ['CharButton'] (Error Code: 1)
Traceback (most recent call last):
  File "site.py", line 103, in main
  File "site.py", line 85, in run_entry_point
  File "site-packages\calibre\utils\ipc\worker.py", line 96, in main
  File "site-packages\calibre\gui2\convert\gui_conversion.py", line 21, in gui_convert
  File "site-packages\calibre\ebooks\conversion\plumber.py", line 745, in run
  File "site-packages\calibre\customize\conversion.py", line 208, in __call__
  File "site-packages\calibre\ebooks\lrf\input.py", line 367, in convert
  File "site-packages\calibre\ebooks\lrf\lrfparser.py", line 113, in to_xml
  File "site-packages\calibre\ebooks\lrf\objects.py", line 420, in __unicode__
  File "site-packages\calibre\ebooks\lrf\objects.py", line 606, in __unicode__
  File "site-packages\calibre\ebooks\lrf\objects.py", line 884, in __unicode__
calibre.ebooks.lrf.LRFParseError: Malformed text stream ['CharButton']

The book displays without problems in the calibre ebook-viewer.

[Joerg_Mosthaf]

lrf of Flatland

[kovidgoyal]

Fixed in branch trunk. The fix will be in the next release.