Pure Erlang implementation of 9p2000 protocol
filesystem
fs
9p2000
erlang
9p
Fix bug with invalid device size when encoding stats
+40
-7
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src/e9p_msg.erl
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-7
src/e9p_msg.erl
···
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%% @end
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-module(e9p_msg).
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-export([parse/1, encode/2, encode_stat/1]).
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-export([parse/1, encode/2, encode_stat/1, parse_stat/1]).
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-export_type([tag/0,
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message/0,
···
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do_parse(Type, Data) ->
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{error, {invalid_message, Type, Data}}.
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parse_stat(<<_Size:2/?int,
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Type:2/?int,
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parse_stat(<<Type:2/?int,
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Dev:4/?int,
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QID:13/binary,
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Mode:4/?int,
···
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dev => Dev,
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qid => binary_to_qid(QID),
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mode => Mode,
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atime => calendar:system_time_to_universal_time(Atime, seconds),
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mtime => calendar:system_time_to_universal_time(Mtime, seconds),
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atime => Atime,
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mtime => Mtime,
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length => Len,
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name => Name,
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uid => Uid,
···
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}) ->
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Encoded = [<<
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Type:2/?int,
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Dev:2/?int
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Dev:4/?int
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>>,
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qid_to_binary(QID),
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<<Mode:4/?int>>,
···
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[<<Len:?len>> | Data].
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binary_to_qid(<<Type:1/?int, Version:4/?int, Path:8/?int>>) ->
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#{type => Type, version => Version, path => Path}.
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#{type => Type, version => Version, path => Path, state => []}.
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qid_to_binary(#{type := Type, version := Version, path := Path}) ->
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<<Type:1/?int, Version:4/?int, Path:8/?int>>.
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time_to_encoded_sec(Sec) when is_integer(Sec) -> <<Sec:4/?int>>;
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time_to_encoded_sec(Time) ->
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Sec = calendar:universal_time_to_system_time(Time, [{unit, second}]),
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<<Sec:4/?int>>.
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test/e9p_msg_SUITE.erl
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test/e9p_msg_SUITE.erl
···
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% SPDX-FileCopyrightText: 2026 Łukasz Niemier <~@hauleth.dev>
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%
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% SPDX-License-Identifier: Apache-2.0
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-module(e9p_msg_SUITE).
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-compile(export_all).
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-include("e9p_internal.hrl").
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-include_lib("stdlib/include/assert.hrl").
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-include_lib("common_test/include/ct.hrl").
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all() -> [stat_encode_decode].
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stat_encode_decode(_Conf) ->
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Stat = #{
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type => 0,
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dev => 0,
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qid => e9p:make_qid(directory, 0, 0, []),
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mode => 0,
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atime => 0,
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mtime => 0,
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length => 0,
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name => <<>>,
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uid => <<>>,
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gid => <<>>,
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muid => <<>>
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},
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<<Len:?len, Out:Len/binary>> = iolist_to_binary(e9p_msg:encode_stat(Stat)),
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Decoded = e9p_msg:parse_stat(Out),
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?assertEqual({ok, Stat}, Decoded).
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