%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 1997-2012. 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
%% compliance with the License. You should have received a copy of the
%% Erlang Public License along with this software. If not, it can be
%% retrieved online at http://www.erlang.org/.
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and limitations
%% under the License.
%%
%% %CopyrightEnd%
%%
-module(win32reg).
-export([open/1, close/1,
current_key/1, change_key/2, change_key_create/2,
sub_keys/1, delete_key/1,
value/2, values/1, set_value/3, delete_value/2,
expand/1,
format_error/1]).
-export_type([reg_handle/0]).
%% Key handles (always open).
-define(hkey_classes_root, 16#80000000).
-define(hkey_current_user, 16#80000001).
-define(hkey_local_machine, 16#80000002).
-define(hkey_users, 16#80000003).
-define(hkey_performance_data, 16#80000004).
-define(hkey_current_config, 16#80000005).
-define(hkey_dyn_data, 16#80000006).
%% Driver commands.
-define(cmd_get_current, 0).
-define(cmd_open_key, 1).
-define(cmd_create_key, 2).
-define(cmd_get_all_subkeys, 3).
-define(cmd_get_value, 4).
-define(cmd_get_all_values, 5).
-define(cmd_set_value, 6).
-define(cmd_delete_key, 7).
-define(cmd_delete_value, 8).
%% Data types.
-define(reg_sc, 1).
-define(reg_expand_sc, 2).
-define(reg_binary, 3).
-define(reg_dword, 4).
%% Basic types internal to this file.
-opaque reg_handle() :: {'win32reg',port()}.
-type name() :: string() | 'default'.
-type value() :: string() | integer() | binary().
%%% Exported functions.
-spec open(OpenModeList) -> ReturnValue when
OpenModeList :: [OpenMode],
OpenMode :: 'read' | 'write',
ReturnValue :: {'ok', RegHandle} | {'error', ErrorId :: 'enotsup'},
RegHandle :: reg_handle().
open(Modes) ->
case os:type() of
{win32, _} ->
case open_mode(Modes, []) of
{error, Reason} ->
{error, Reason};
ModeStr ->
P = open_port({spawn, "registry__drv__ " ++ ModeStr}, []),
{ok, {win32reg, P}}
end;
_ ->
{error, enotsup}
end.
-spec close(RegHandle) -> 'ok' when
RegHandle :: reg_handle().
close({win32reg, Reg}) when is_port(Reg) ->
unlink(Reg),
exit(Reg, die),
ok.
-spec current_key(RegHandle) -> ReturnValue when
RegHandle :: reg_handle(),
ReturnValue :: {'ok', string()}.
current_key({win32reg, Reg}) when is_port(Reg) ->
Cmd = [?cmd_get_current],
Reg ! {self(), {command, Cmd}},
{state, Hkey, Name} = get_result(Reg),
Root = hkey_to_string(Hkey),
{ok, case Name of
[] -> Root;
_ -> Root ++ [$\\|Name]
end}.
-spec change_key(RegHandle, Key) -> ReturnValue when
RegHandle :: reg_handle(),
Key :: string(),
ReturnValue :: 'ok' | {'error', ErrorId :: atom()}.
change_key({win32reg, Reg}, Key) when is_port(Reg) ->
change_key(Reg, ?cmd_open_key, Key).
-spec change_key_create(RegHandle, Key) -> ReturnValue when
RegHandle :: reg_handle(),
Key :: string(),
ReturnValue :: 'ok' | {'error', ErrorId :: atom()}.
change_key_create({win32reg, Reg}, Key) when is_port(Reg) ->
change_key(Reg, ?cmd_create_key, Key).
change_key(Reg, Cmd, Key) ->
case parse_key(Key, Reg) of
{ok, Hkey, Path} ->
Reg ! {self(), {command, [Cmd, i32(Hkey), Path, 0]}},
get_result(Reg);
{error, Reason} ->
{error, Reason}
end.
-spec sub_keys(RegHandle) -> ReturnValue when
RegHandle :: reg_handle(),
ReturnValue :: {'ok', [SubKey]} | {'error', ErrorId :: atom()},
SubKey :: string().
sub_keys({win32reg, Reg}) when is_port(Reg) ->
Cmd = [?cmd_get_all_subkeys],
Reg ! {self(), {command, Cmd}},
collect_keys(Reg, []).
-spec delete_key(RegHandle) -> ReturnValue when
RegHandle :: reg_handle(),
ReturnValue :: 'ok' | {'error', ErrorId :: atom()}.
delete_key({win32reg, Reg}) when is_port(Reg) ->
Cmd = [?cmd_delete_key],
Reg ! {self(), {command, Cmd}},
get_result(Reg).
-spec set_value(RegHandle, Name, Value) -> ReturnValue when
RegHandle :: reg_handle(),
Name :: name(),
Value :: value(),
ReturnValue :: 'ok' | {'error', ErrorId :: atom()}.
set_value({win32reg, Reg}, Name0, Value) when is_port(Reg) ->
Name =
case Name0 of
default -> [];
_ -> Name0
end,
{Type, V} = term_to_value(Value),
Cmd = [?cmd_set_value, Type, Name, 0, V],
Reg ! {self(), {command, Cmd}},
get_result(Reg).
-spec value(RegHandle, Name) -> ReturnValue when
RegHandle :: reg_handle(),
Name :: name(),
ReturnValue :: {'ok', Value :: value()} | {'error', ErrorId :: atom()}.
value({win32reg, Reg}, Name) when is_port(Reg) ->
Cmd = [?cmd_get_value, Name, 0],
Reg ! {self(), {command, Cmd}},
case get_result(Reg) of
{value, {Name, Value}} ->
{ok, Value};
{error, Reason} ->
{error, Reason}
end.
-spec values(RegHandle) -> ReturnValue when
RegHandle :: reg_handle(),
ReturnValue :: {'ok', [ValuePair]} | {'error', ErrorId :: atom()},
ValuePair :: {Name :: name(), Value :: value()}.
values({win32reg, Reg}) when is_port(Reg) ->
Cmd = [?cmd_get_all_values],
Reg ! {self(), {command, Cmd}},
collect_values(Reg, []).
-spec delete_value(RegHandle, Name) -> ReturnValue when
RegHandle :: reg_handle(),
Name :: name(),
ReturnValue :: 'ok' | {'error', ErrorId :: atom()}.
delete_value({win32reg, Reg}, Name0) when is_port(Reg) ->
Name =
case Name0 of
default -> [];
_ -> Name0
end,
Cmd = [?cmd_delete_value, Name, 0],
Reg ! {self(), {command, Cmd}},
get_result(Reg).
-spec expand(String) -> ExpandedString when
String :: string(),
ExpandedString :: string().
expand(Value) ->
expand(Value, [], []).
expand([$%, $%|Rest], [], Result) ->
expand(Rest, [], [$%|Result]);
expand([$%, C|Rest], [], Result) ->
expand(Rest, [C], Result);
expand([C|Rest], [], Result) ->
expand(Rest, [], [C|Result]);
expand([$%|Rest], Env0, Result) ->
Env = lists:reverse(Env0),
expand(Rest, [], lists:reverse(os:getenv(Env, ""))++Result);
expand([C|Rest], Env, Result) ->
expand(Rest, [C|Env], Result);
expand([], [], Result) ->
lists:reverse(Result).
-spec format_error(ErrorId) -> ErrorString when
ErrorId :: atom(),
ErrorString :: string().
format_error(ErrorId) ->
erl_posix_msg:message(ErrorId).
%%% Implementation.
-spec collect_values(port(), [{name(), value()}]) ->
{'ok', [{name(), value()}]} | {'error', ErrorId :: atom()}.
collect_values(P, Result) ->
case get_result(P) of
ok ->
{ok, lists:reverse(Result)};
{value, ValueData} ->
collect_values(P, [ValueData|Result]);
{error, Reason} ->
{error, Reason}
end.
-spec collect_keys(port(), string()) -> {'ok', [string()]} | {'error', ErrorId :: atom()}.
collect_keys(P, Result) ->
case get_result(P) of
ok ->
{ok, lists:reverse(Result)};
{key, KeyData} ->
collect_keys(P, [KeyData|Result]);
{error, Reason} ->
{error, Reason}
end.
get_result(P) ->
receive
{P, {data, Data}} ->
get_result1(Data)
end.
get_result1([$e|Reason]) ->
{error, list_to_atom(Reason)};
get_result1([$o]) ->
ok;
get_result1([$k|Name]) ->
{key, Name};
get_result1([$v|Rest0]) ->
{ok, Type, Rest1} = i32_on_head(Rest0),
{ok, Name0, Value} = get_cstring(Rest1),
Name =
case Name0 of
[] -> default;
_ -> Name0
end,
{value, {Name, encode_value(Type, Value)}};
get_result1([$s|Rest0]) ->
{ok, Hkey, Name} = i32_on_head(Rest0),
{state, Hkey, Name}.
encode_value(?reg_sc, Value) ->
Value;
encode_value(?reg_expand_sc, Value) ->
Value;
encode_value(?reg_dword, Value) ->
i32(Value);
encode_value(_, Value) ->
list_to_binary(Value).
term_to_value(Int) when is_integer(Int) ->
{i32(?reg_dword), i32(Int)};
term_to_value(String) when is_list(String) ->
{i32(?reg_sc), [String, 0]};
term_to_value(Bin) when is_binary(Bin) ->
{i32(?reg_binary), Bin};
term_to_value(_) ->
exit(badarg).
get_cstring(List) ->
get_cstring(List, []).
get_cstring([0|Rest], Result) ->
{ok, lists:reverse(Result), Rest};
get_cstring([C|Rest], Result) ->
get_cstring(Rest, [C|Result]);
get_cstring([], Result) ->
{ok, lists:reverse(Result), []}.
i32(Int) when is_integer(Int) ->
[(Int bsr 24) band 255,
(Int bsr 16) band 255,
(Int bsr 8) band 255,
Int band 255];
i32([X1, X2, X3, X4]) ->
(X1 bsl 24) bor (X2 bsl 16) bor (X3 bsl 8) bor X4.
i32_on_head([X1, X2, X3, X4 | Rest]) ->
{ok, (X1 bsl 24) bor (X2 bsl 16) bor (X3 bsl 8) bor X4, Rest}.
parse_key([$\\|Rest], _) ->
parse_root(Rest, []);
parse_key(Key, Reg) ->
parse_relative(Key, Reg).
parse_relative(Path, Reg) ->
Cmd = [?cmd_get_current],
Reg ! {self(), {command, Cmd}},
{state, RootHandle, Name} = get_result(Reg),
Original = split_key(Name),
Relative = lists:reverse(split_key(Path)),
case parse_relative1(Relative, Original) of
NewPath ->
{ok, RootHandle, NewPath}
%% XXX Error handling.
end.
parse_relative1([".."|T1], [_|T2]) ->
parse_relative1(T1, T2);
parse_relative1([Comp|Rest], Result) ->
parse_relative1(Rest, [Comp|Result]);
parse_relative1([], Result) ->
reverse_and_join(Result, []).
reverse_and_join([X|Rest], []) ->
reverse_and_join(Rest, [X]);
reverse_and_join([X|Rest], Result) ->
reverse_and_join(Rest, [X, "\\" | Result]);
reverse_and_join([], Result) ->
Result.
split_key(Key) ->
split_key(Key, [], []).
split_key([$\\|Rest], Current, Result) ->
split_key(Rest, [], [lists:reverse(Current)|Result]);
split_key([C|Rest], Current, Result) ->
split_key(Rest, [C|Current], Result);
split_key([], [], Result) ->
Result;
split_key([], Current, Result) ->
[lists:reverse(Current)|Result].
parse_root([$\\|Rest], Result) ->
Root =
case lists:reverse(Result) of
[$h, $k, $e, $y, $_|Root0] ->
Root0;
Root0 ->
Root0
end,
case root_to_handle(list_to_atom(Root)) of
false ->
{error, enoent};
Handle ->
{ok, Handle, Rest}
end;
parse_root([C|Rest], Result) ->
parse_root(Rest, [C|Result]);
parse_root([], Result) ->
parse_root([$\\], Result).
root_to_handle(classes_root) -> ?hkey_classes_root;
root_to_handle(hkcr) -> ?hkey_classes_root;
root_to_handle(current_user) -> ?hkey_current_user;
root_to_handle(hkcu) -> ?hkey_current_user;
root_to_handle(local_machine) -> ?hkey_local_machine;
root_to_handle(hklm) -> ?hkey_local_machine;
root_to_handle(users) -> ?hkey_users;
root_to_handle(hku) -> ?hkey_users;
root_to_handle(current_config) -> ?hkey_current_config;
root_to_handle(hkcc) -> ?hkey_current_config;
root_to_handle(dyn_data) -> ?hkey_dyn_data;
root_to_handle(hkdd) -> ?hkey_dyn_data;
root_to_handle(performance_data) -> ?hkey_performance_data;
root_to_handle(_) -> false.
hkey_to_string(?hkey_classes_root) -> "\\hkey_classes_root";
hkey_to_string(?hkey_current_user) -> "\\hkey_current_user";
hkey_to_string(?hkey_local_machine) -> "\\hkey_local_machine";
hkey_to_string(?hkey_users) -> "\\hkey_users";
hkey_to_string(?hkey_performance_data) -> "\\hkey_performance_data";
hkey_to_string(?hkey_current_config) -> "\\hkey_current_config";
hkey_to_string(?hkey_dyn_data) -> "\\hkey_dyn_data".
open_mode([read|Rest], Result) ->
open_mode(Rest, [$r|Result]);
open_mode([write|Rest], Result) ->
open_mode(Rest, [$w|Result]);
open_mode([], Result) ->
Result;
open_mode(_, _) ->
{error, einval}.
