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%% Copyright (c) 2023 Peter Morgan <peter.james.morgan@gmail.com> |
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%% |
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%% Licensed under the Apache License, Version 2.0 (the "License"); |
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%% you may not use this file except in compliance with the License. |
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%% You may obtain a copy of the License at |
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%% |
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%% http://www.apache.org/licenses/LICENSE-2.0 |
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%% |
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%% Unless required by applicable law or agreed to in writing, software |
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%% distributed under the License is distributed on an "AS IS" BASIS, |
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%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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%% See the License for the specific language governing permissions and |
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%% limitations under the License. |
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-module(pgmp_lsn). |
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-export([decode/1]). |
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-export([encode/1]). |
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decode(LSN) when is_binary(LSN) -> |
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1 |
case string:split(LSN, "/", all) of |
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[Upper, Lower] -> |
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1 |
decode(binary_to_integer(Upper, 16), |
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binary_to_integer(Lower, 16)); |
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_ -> |
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:-( |
error(badarg, [LSN]) |
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end. |
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decode(Upper, Lower) -> |
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1 |
(Upper bsl 32) + Lower. |
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encode(LSN) when is_integer(LSN) -> |
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<<Upper:32, Lower:32>> = <<LSN:64>>, |
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iolist_to_binary( |
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io_lib:format("~.16B/~.16B", [Upper, Lower])). |