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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 Developer of the Original Code is VMware, Inc.
%% Copyright (c) 2007-2011 VMware, Inc. All rights reserved.
%%
-module(rabbit_binary_parser).
-include("rabbit.hrl").
-export([parse_table/1]).
-export([ensure_content_decoded/1, clear_decoded_content/1]).
%%----------------------------------------------------------------------------
-ifdef(use_specs).
-spec(parse_table/1 :: (binary()) -> rabbit_framing:amqp_table()).
-spec(ensure_content_decoded/1 ::
(rabbit_types:content()) -> rabbit_types:decoded_content()).
-spec(clear_decoded_content/1 ::
(rabbit_types:content()) -> rabbit_types: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}.
ensure_content_decoded(Content = #content{properties = Props})
when Props =/= none ->
Content;
ensure_content_decoded(Content = #content{properties_bin = PropBin,
protocol = Protocol})
when PropBin =/= none ->
Content#content{properties = Protocol: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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