Convert fontname to str if it is bytes in HTMLConverter

CHANGELOG.md

@@ -1,17 +1,26 @@
 # Changelog
-All notable changes in pdfminer.six will be documented in this file. 
+
+All notable changes in pdfminer.six will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
+## [Unreleased]
+
+### Fixes
+
+- `TypeError` in HTMLConverter when using a bytes fontname ([#734](https://github.com/pdfminer/pdfminer.six/pull/734))
+
 ## [20220319]
 
 ### Added
+
 - Export type annotations from pypi package per PEP561 ([#679](https://github.com/pdfminer/pdfminer.six/pull/679))
 - Support for identity cmap's ([#626](https://github.com/pdfminer/pdfminer.six/pull/626))
 - Add support for PDF page labels ([#680](https://github.com/pdfminer/pdfminer.six/pull/680))
 - Installation of Pillow as an optional extra dependency ([#714](https://github.com/pdfminer/pdfminer.six/pull/714))
 
 ### Fixed
+
 - Hande decompression error due to CRC checksum error ([#637](https://github.com/pdfminer/pdfminer.six/pull/637))
 - Regression (since 20191107) in `LTLayoutContainer.group_textboxes` that returned some text lines out of order ([#659](https://github.com/pdfminer/pdfminer.six/pull/659))
 - Add handling of JPXDecode filter to enable extraction of images for some pdfs ([#645](https://github.com/pdfminer/pdfminer.six/pull/645))

pdfminer/converter.py

@@ -40,7 +40,7 @@
 from .pdfinterp import PDFGraphicState, PDFResourceManager
 from .pdfpage import PDFPage
 from .pdftypes import PDFStream
-from .utils import AnyIO, Point, Matrix, Rect, PathSegment
+from .utils import AnyIO, Point, Matrix, Rect, PathSegment, make_compat_str
 from .utils import apply_matrix_pt
 from .utils import bbox2str
 from .utils import enc
@@ -633,7 +633,8 @@ def render(item: LTItem) -> None:
                             render(child)
                         self.end_div("textbox")
                     elif isinstance(item, LTChar):
-                        self.put_text(item.get_text(), item.fontname, item.size)
+                        fontname = make_compat_str(item.fontname)
+                        self.put_text(item.get_text(), fontname, item.size)
                     elif isinstance(item, LTText):
                         self.write_text(item.get_text())
             return

pdfminer/utils.py

@@ -76,7 +76,10 @@ def make_compat_str(o: object) -> str:
     """Converts everything to string, if bytes guessing the encoding."""
     if isinstance(o, bytes):
         enc = chardet.detect(o)
-        return o.decode(enc["encoding"])
+        try:
+            return o.decode(enc["encoding"])
+        except UnicodeDecodeError:
+            return str(o)
     else:
         return str(o)