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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 GoPivotal, Inc.
%% Copyright (c) 2007-2014 GoPivotal, Inc. All rights reserved.
%%
-module(rabbit_binary_parser).
-include("rabbit.hrl").
-export([parse_table/1]).
-export([ensure_content_decoded/1, clear_decoded_content/1]).
-export([validate_utf8/1, assert_utf8/1]).
%%----------------------------------------------------------------------------
-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()).
-spec(validate_utf8/1 :: (binary()) -> 'ok' | 'error').
-spec(assert_utf8/1 :: (binary()) -> 'ok').
-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(<<$S, VLen:32/unsigned, V:VLen/binary, R/binary>>) ->
{longstr, V, R};
parse_field_value(<<$I, V:32/signed, R/binary>>) ->
{signedint, V, R};
parse_field_value(<<$D, Before:8/unsigned, After:32/unsigned, R/binary>>) ->
{decimal, {Before, After}, R};
parse_field_value(<<$T, V:64/unsigned, R/binary>>) ->
{timestamp, V, R};
parse_field_value(<<$F, VLen:32/unsigned, Table:VLen/binary, R/binary>>) ->
{table, parse_table(Table), R};
parse_field_value(<<$A, VLen:32/unsigned, Array:VLen/binary, R/binary>>) ->
{array, parse_array(Array), R};
parse_field_value(<<$b, V:8/signed, R/binary>>) -> {byte, V, R};
parse_field_value(<<$d, V:64/float, R/binary>>) -> {double, V, R};
parse_field_value(<<$f, V:32/float, R/binary>>) -> {float, V, R};
parse_field_value(<<$l, V:64/signed, R/binary>>) -> {long, V, R};
parse_field_value(<<$s, V:16/signed, R/binary>>) -> {short, V, R};
parse_field_value(<<$t, V:8/unsigned, R/binary>>) -> {bool, (V /= 0), R};
parse_field_value(<<$x, VLen:32/unsigned, V:VLen/binary, R/binary>>) ->
{binary, V, R};
parse_field_value(<<$V, R/binary>>) ->
{void, undefined, R}.
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}.
assert_utf8(B) ->
case validate_utf8(B) of
ok -> ok;
error -> rabbit_misc:protocol_error(
frame_error, "Malformed UTF-8 in shortstr", [])
end.
validate_utf8(Bin) ->
try
xmerl_ucs:from_utf8(Bin),
ok
catch exit:{ucs, _} ->
error
end.
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