3 files changed, 16 insertions, 2 deletions
diff --git a/lib/stdlib/src/dets_v8.erl b/lib/stdlib/src/dets_v8.erl
index 1f9f84cd27..af36958c1c 100644
--- a/lib/stdlib/src/dets_v8.erl
+++ b/lib/stdlib/src/dets_v8.erl
@@ -1074,6 +1074,8 @@ wl([], _Type, Del, Lookup, I, Objs) ->
     [{Del, Lookup, Objs} | I].
 
 %% -> {NewHead, ok} | {NewHead, Error}
+may_grow(Head, 0, once) ->
+    {Head, ok};
 may_grow(Head, _N, _How) when Head#head.fixed =/= false ->
     {Head, ok};
 may_grow(#head{access = read}=Head, _N, _How) ->
diff --git a/lib/stdlib/src/dets_v9.erl b/lib/stdlib/src/dets_v9.erl
index 53238e962f..132af01f79 100644
--- a/lib/stdlib/src/dets_v9.erl
+++ b/lib/stdlib/src/dets_v9.erl
@@ -1,7 +1,7 @@
 %%
 %% %CopyrightBegin%
 %% 
-%% Copyright Ericsson AB 2001-2009. All Rights Reserved.
+%% Copyright Ericsson AB 2001-2010. All Rights Reserved.
 %% 
 %% The contents of this file are subject to the Erlang Public License,
 %% Version 1.1, (the "License"); you may not use this file except in
@@ -1908,6 +1908,9 @@ write_cache(Head) ->
     end.
 
 %% -> {NewHead, ok} | {NewHead, Error}
+may_grow(Head, 0, once) ->
+    %% Do not re-hash if there is a chance that the file is not dirty.
+    {Head, ok};
 may_grow(Head, _N, _How) when Head#head.fixed =/= false ->
     {Head, ok};
 may_grow(#head{access = read}=Head, _N, _How) ->
diff --git a/lib/stdlib/src/unicode.erl b/lib/stdlib/src/unicode.erl
index 09b1deff9c..869505ba83 100644
--- a/lib/stdlib/src/unicode.erl
+++ b/lib/stdlib/src/unicode.erl
@@ -25,8 +25,17 @@
 %%                         InEncoding is not {latin1 | unicode | utf8})
 %%
 
--export([characters_to_list/1, characters_to_list_int/2, characters_to_binary/1,characters_to_binary_int/2, characters_to_binary/3,bom_to_encoding/1, encoding_to_bom/1]).
+-export([characters_to_list/1, characters_to_list_int/2,
+	 characters_to_binary/1, characters_to_binary_int/2,
+	 characters_to_binary/3,
+	 bom_to_encoding/1, encoding_to_bom/1]).
 
+-export_type([encoding/0]).
+
+-type encoding()  :: 'latin1' | 'unicode' | 'utf8'
+                   | 'utf16' | {'utf16', endian()}
+                   | 'utf32' | {'utf32', endian()}.
+-type endian()    :: 'big' | 'little'.
 
 characters_to_list(ML) ->
     unicode:characters_to_list(ML,unicode).