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%% The contents of this file are subject to the Mozilla Public License
%% Version 1.1 (the "License"); you may not use this file except in
%% compliance with the License. You may obtain a copy of the License at
%% http://www.mozilla.org/MPL/
%%
%% 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.
%%
%% The Original Code is RabbitMQ.
%%
%% The Initial Developers of the Original Code are LShift Ltd,
%% Cohesive Financial Technologies LLC, and Rabbit Technologies Ltd.
%%
%% Portions created before 22-Nov-2008 00:00:00 GMT by LShift Ltd,
%% Cohesive Financial Technologies LLC, or Rabbit Technologies Ltd
%% are Copyright (C) 2007-2008 LShift Ltd, Cohesive Financial
%% Technologies LLC, and Rabbit Technologies Ltd.
%%
%% Portions created by LShift Ltd are Copyright (C) 2007-2009 LShift
%% Ltd. Portions created by Cohesive Financial Technologies LLC are
%% Copyright (C) 2007-2009 Cohesive Financial Technologies
%% LLC. Portions created by Rabbit Technologies Ltd are Copyright
%% (C) 2007-2009 Rabbit Technologies Ltd.
%%
%% All Rights Reserved.
%%
%% Contributor(s): ______________________________________.
%%
-module(rabbit_binary_parser).
-include("rabbit.hrl").
-export([parse_table/1, parse_properties/2]).
-export([ensure_content_decoded/1, clear_decoded_content/1]).
-import(lists).
%%----------------------------------------------------------------------------
-ifdef(use_specs).
-spec(parse_table/1 :: (binary()) -> amqp_table()).
-spec(parse_properties/2 :: ([amqp_property_type()], binary()) -> [any()]).
-spec(ensure_content_decoded/1 :: (content()) -> decoded_content()).
-spec(clear_decoded_content/1 :: (content()) -> undecoded_content()).
-endif.
%%----------------------------------------------------------------------------
%% parse_table supports the AMQP 0-8/0-9 standard types, S, I, D, T
%% and F, as well as the QPid extensions b, d, f, l, s, t, x, and V.
parse_table(<<>>) ->
[];
parse_table(<<NLen:8/unsigned, NameString:NLen/binary, ValueAndRest/binary>>) ->
{Type, Value, Rest} = parse_field_value(ValueAndRest),
[{NameString, Type, Value} | parse_table(Rest)].
parse_array(<<>>) ->
[];
parse_array(<<ValueAndRest/binary>>) ->
{Type, Value, Rest} = parse_field_value(ValueAndRest),
[{Type, Value} | parse_array(Rest)].
parse_field_value(<<"S", VLen:32/unsigned, ValueString:VLen/binary, Rest/binary>>) ->
{longstr, ValueString, Rest};
parse_field_value(<<"I", Value:32/signed, Rest/binary>>) ->
{signedint, Value, Rest};
parse_field_value(<<"D", Before:8/unsigned, After:32/unsigned, Rest/binary>>) ->
{decimal, {Before, After}, Rest};
parse_field_value(<<"T", Value:64/unsigned, Rest/binary>>) ->
{timestamp, Value, Rest};
parse_field_value(<<"F", VLen:32/unsigned, Table:VLen/binary, Rest/binary>>) ->
{table, parse_table(Table), Rest};
parse_field_value(<<"A", VLen:32/unsigned, Array:VLen/binary, Rest/binary>>) ->
{array, parse_array(Array), Rest};
parse_field_value(<<"b", Value:8/unsigned, Rest/binary>>) ->
{byte, Value, Rest};
parse_field_value(<<"d", Value:64/float, Rest/binary>>) ->
{double, Value, Rest};
parse_field_value(<<"f", Value:32/float, Rest/binary>>) ->
{float, Value, Rest};
parse_field_value(<<"l", Value:64/signed, Rest/binary>>) ->
{long, Value, Rest};
parse_field_value(<<"s", Value:16/signed, Rest/binary>>) ->
{short, Value, Rest};
parse_field_value(<<"t", Value:8/unsigned, Rest/binary>>) ->
{bool, (Value /= 0), Rest};
parse_field_value(<<"x", VLen:32/unsigned, ValueString:VLen/binary, Rest/binary>>) ->
{binary, ValueString, Rest};
parse_field_value(<<"V", Rest/binary>>) ->
{void, undefined, Rest}.
parse_properties([], _PropBin) ->
[];
parse_properties(TypeList, PropBin) ->
FlagCount = length(TypeList),
%% round up to the nearest multiple of 15 bits, since the 16th bit
%% in each short is a "continuation" bit.
FlagsLengthBytes = trunc((FlagCount + 14) / 15) * 2,
<<Flags:FlagsLengthBytes/binary, Properties/binary>> = PropBin,
<<FirstShort:16, Remainder/binary>> = Flags,
parse_properties(0, TypeList, [], FirstShort, Remainder, Properties).
parse_properties(_Bit, [], Acc, _FirstShort,
_Remainder, <<>>) ->
lists:reverse(Acc);
parse_properties(_Bit, [], _Acc, _FirstShort,
_Remainder, _LeftoverBin) ->
exit(content_properties_binary_overflow);
parse_properties(15, TypeList, Acc, _OldFirstShort,
<<NewFirstShort:16,Remainder/binary>>, Properties) ->
parse_properties(0, TypeList, Acc, NewFirstShort, Remainder, Properties);
parse_properties(Bit, [Type | TypeListRest], Acc, FirstShort,
Remainder, Properties) ->
{Value, Rest} =
if (FirstShort band (1 bsl (15 - Bit))) /= 0 ->
parse_property(Type, Properties);
Type == bit -> {false , Properties};
true -> {undefined, Properties}
end,
parse_properties(Bit + 1, TypeListRest, [Value | Acc], FirstShort,
Remainder, Rest).
parse_property(shortstr, <<Len:8/unsigned, String:Len/binary, Rest/binary>>) ->
{String, Rest};
parse_property(longstr, <<Len:32/unsigned, String:Len/binary, Rest/binary>>) ->
{String, Rest};
parse_property(octet, <<Int:8/unsigned, Rest/binary>>) ->
{Int, Rest};
parse_property(shortint, <<Int:16/unsigned, Rest/binary>>) ->
{Int, Rest};
parse_property(longint, <<Int:32/unsigned, Rest/binary>>) ->
{Int, Rest};
parse_property(longlongint, <<Int:64/unsigned, Rest/binary>>) ->
{Int, Rest};
parse_property(timestamp, <<Int:64/unsigned, Rest/binary>>) ->
{Int, Rest};
parse_property(bit, Rest) ->
{true, Rest};
parse_property(table, <<Len:32/unsigned, Table:Len/binary, Rest/binary>>) ->
{parse_table(Table), Rest}.
ensure_content_decoded(Content = #content{properties = Props})
when Props =/= 'none' ->
Content;
ensure_content_decoded(Content = #content{properties_bin = PropBin})
when is_binary(PropBin) ->
Content#content{properties = rabbit_framing:decode_properties(
Content#content.class_id, PropBin)}.
clear_decoded_content(Content = #content{properties = none}) ->
Content;
clear_decoded_content(Content = #content{properties_bin = none}) ->
%% Only clear when we can rebuild the properties later in
%% accordance to the content record definition comment - maximum
%% one of properties and properties_bin can be 'none'
Content;
clear_decoded_content(Content = #content{}) ->
Content#content{properties = none}.
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