Add a MD5 checksum to the BDIC header....

third_party/hunspell/google/bdict_writer.cc

Index: third_party/hunspell/google/bdict_writer.cc
===================================================================
--- third_party/hunspell/google/bdict_writer.cc	(revision 65173)
+++ third_party/hunspell/google/bdict_writer.cc	(working copy)
@@ -464,6 +464,11 @@
   header->aff_offset = static_cast<uint32>(aff_offset);
   header->dic_offset = static_cast<uint32>(dic_offset);
 
+  // Write the MD5 digest of the affix information and the dictionary words at
+  // the end of the BDic header.
+  if (header->major_version >= 2)
+    MD5Sum(&ret[aff_offset], ret.size() - aff_offset, &header->digest);
+
   return ret;
 }