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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.
-define(SIMPLE_PARSE_TABLE(BType, Pattern, RType),
parse_table(<<NLen:8/unsigned, NameString:NLen/binary,
BType, Pattern, Rest/binary>>) ->
[{NameString, RType, Value} | parse_table(Rest)]).
%% Note that we try to put these in approximately the order we expect
%% to hit them, that's why the empty binary is half way through.
parse_table(<<NLen:8/unsigned, NameString:NLen/binary,
$S, VLen:32/unsigned, Value:VLen/binary, Rest/binary>>) ->
[{NameString, longstr, Value} | parse_table(Rest)];
?SIMPLE_PARSE_TABLE($I, Value:32/signed, signedint);
?SIMPLE_PARSE_TABLE($T, Value:64/unsigned, timestamp);
parse_table(<<>>) ->
[];
?SIMPLE_PARSE_TABLE($b, Value:8/signed, byte);
?SIMPLE_PARSE_TABLE($d, Value:64/float, double);
?SIMPLE_PARSE_TABLE($f, Value:32/float, float);
?SIMPLE_PARSE_TABLE($l, Value:64/signed, long);
?SIMPLE_PARSE_TABLE($s, Value:16/signed, short);
parse_table(<<NLen:8/unsigned, NameString:NLen/binary,
$t, Value:8/unsigned, Rest/binary>>) ->
[{NameString, bool, (Value /= 0)} | parse_table(Rest)];
parse_table(<<NLen:8/unsigned, NameString:NLen/binary,
$D, Before:8/unsigned, After:32/unsigned, Rest/binary>>) ->
[{NameString, decimal, {Before, After}} | parse_table(Rest)];
parse_table(<<NLen:8/unsigned, NameString:NLen/binary,
$F, VLen:32/unsigned, Value:VLen/binary, Rest/binary>>) ->
[{NameString, table, parse_table(Value)} | parse_table(Rest)];
parse_table(<<NLen:8/unsigned, NameString:NLen/binary,
$A, VLen:32/unsigned, Value:VLen/binary, Rest/binary>>) ->
[{NameString, array, parse_array(Value)} | parse_table(Rest)];
parse_table(<<NLen:8/unsigned, NameString:NLen/binary,
$x, VLen:32/unsigned, Value:VLen/binary, Rest/binary>>) ->
[{NameString, binary, Value} | parse_table(Rest)];
parse_table(<<NLen:8/unsigned, NameString:NLen/binary,
$V, Rest/binary>>) ->
[{NameString, void, undefined} | parse_table(Rest)].
-define(SIMPLE_PARSE_ARRAY(BType, Pattern, RType),
parse_array(<<BType, Pattern, Rest/binary>>) ->
[{RType, Value} | parse_array(Rest)]).
parse_array(<<$S, VLen:32/unsigned, Value:VLen/binary, Rest/binary>>) ->
[{longstr, Value} | parse_array(Rest)];
?SIMPLE_PARSE_ARRAY($I, Value:32/signed, signedint);
?SIMPLE_PARSE_ARRAY($T, Value:64/unsigned, timestamp);
parse_array(<<>>) ->
[];
?SIMPLE_PARSE_ARRAY($b, Value:8/signed, byte);
?SIMPLE_PARSE_ARRAY($d, Value:64/float, double);
?SIMPLE_PARSE_ARRAY($f, Value:32/float, float);
?SIMPLE_PARSE_ARRAY($l, Value:64/signed, long);
?SIMPLE_PARSE_ARRAY($s, Value:16/signed, short);
parse_array(<<$t, Value:8/unsigned, Rest/binary>>) ->
[{bool, (Value /= 0)} | parse_array(Rest)];
parse_array(<<$D, Before:8/unsigned, After:32/unsigned, Rest/binary>>) ->
[{decimal, {Before, After}} | parse_array(Rest)];
parse_array(<<$F, VLen:32/unsigned, Value:VLen/binary, Rest/binary>>) ->
[{table, parse_table(Value)} | parse_array(Rest)];
parse_array(<<$A, VLen:32/unsigned, Value:VLen/binary, Rest/binary>>) ->
[{array, parse_array(Value)} | parse_array(Rest)];
parse_array(<<$x, VLen:32/unsigned, Value:VLen/binary, Rest/binary>>) ->
[{binary, Value} | parse_array(Rest)];
parse_array(<<$V, Rest/binary>>) ->
[{void, undefined} | parse_array(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}.
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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