mirror of
https://github.com/Neo-Desktop/WindowsXPKg
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77 lines
1.9 KiB
C++
77 lines
1.9 KiB
C++
/**
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* This file is a part of the UMSKT Project
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*
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* Copyleft (C) 2019-2024 UMSKT Contributors (et.al.)
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* @FileCreated by Neo on 02/13/2024
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* @Maintainer Neo
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*/
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#include "pidgen.h"
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/**
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* The number 7 in an Integer for optimization
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*/
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const Integer PIDGEN::SEVEN = Integer(7);
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/**
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* The number 10 in an Integer for optimization
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*/
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const Integer PIDGEN::TEN = Integer(10);
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/**
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* The maximum Channel ID size (PID 2.0/3.0) in an Integer for optimization
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* 000 - 999
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*/
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const Integer PIDGEN::MaxChannelID = Integer(1'000);
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/**
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* The maximum serial size (PID 2.0/3.0) in an Integer for optimization
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* 000000 - 999999
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*/
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const Integer PIDGEN::MaxSerial = Integer(1'000'000);
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/**
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* Generates a Mod7 check digit for a given Integer
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*
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* @param in Integer to generate
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* @return Mod7 check digit
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*/
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Integer PIDGEN::GenerateMod7(const Integer &in)
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{
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Integer Sum = 0, CheckNum = in;
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while (CheckNum.NotZero())
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{
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Sum += CheckNum % TEN;
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CheckNum /= TEN;
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}
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return SEVEN - (Sum % SEVEN);
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}
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/**
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* Tests if the last digit (one's place) of a given Integer
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* is the expected check digit.
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*
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* @param in Integer to validate
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* @return validity
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*/
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BOOL PIDGEN::isValidMod7(const Integer &in)
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{
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return GenerateMod7(in / TEN) == (in % TEN);
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}
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