fix crash when ida is not shipped with ida_hexrays (issue gaasedelen#88)

Author: gaasedelen

plugins/lighthouse/painting/ida_painter.py

@@ -9,7 +9,7 @@
 
 from lighthouse.util import *
 from lighthouse.util.disassembler import disassembler
-from lighthouse.util.disassembler.ida_api import map_line2citem, map_line2node, lex_citem_indexes
+from lighthouse.util.disassembler.ida_api import map_line2citem, map_line2node, lex_citem_indexes, hexrays_available
 from lighthouse.painting import DatabasePainter
 
 logger = logging.getLogger("Lighthouse.Painting.IDA")
@@ -153,11 +153,11 @@ def _notify_status_changed(self, status):
  # enable / disable hook based on the painter being enabled or disabled
  if status:
  self._idp_hooks.hook()
- if idaapi.init_hexrays_plugin():
+ if hexrays_available():
  idaapi.install_hexrays_callback(self._hxe_callback)
  else:
  self._idp_hooks.unhook()
- if idaapi.init_hexrays_plugin():
+ if hexrays_available():
  idaapi.remove_hexrays_callback(self._hxe_callback)
 
  # send the status changed signal...

plugins/lighthouse/util/disassembler/ida_api.py

@@ -411,6 +411,16 @@ def name_changed(self, address, new_name):
 # HexRays Util
 #------------------------------------------------------------------------------
 
+def hexrays_available():
+ """
+ Return True if an IDA decompiler is loaded and available for use.
+ """
+ try:
+ import ida_hexrays
+ return ida_hexrays.init_hexrays_plugin()
+ except ImportError:
+ return False
+
 def map_line2citem(decompilation_text):
  """
  Map decompilation line numbers to citems.