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Add a few more comments explaining copy direction.

This commit is contained in:
Andrius Štikonas 2022-02-20 00:41:41 +00:00
parent 237d246457
commit d9ceb50238
1 changed files with 5 additions and 2 deletions
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7
src/util/externalcommandhelper.cpp
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@ -1,5 +1,5 @@
/*
SPDX-FileCopyrightText: 2017-2020 Andrius Štikonas <andrius@stikonas.eu>
SPDX-FileCopyrightText: 2017-2022 Andrius Štikonas <andrius@stikonas.eu>
SPDX-FileCopyrightText: 2018 Huzaifa Faruqui <huzaifafaruqui@gmail.com>
SPDX-FileCopyrightText: 2018 Caio Jordão Carvalho <caiojcarvalho@gmail.com>
SPDX-FileCopyrightText: 2018-2019 Harald Sitter <sitter@kde.org>
@ -188,11 +188,14 @@ QVariantMap ExternalCommandHelper::CopyFileData(const QString& sourceDevice, con
reply[QStringLiteral("success")] = true;
// This enum specified whether individual blocks are moved left or right
// When source and target devices are the same we have to be careful not to overwrite
// source data with newly written data. We don't have to do this if sourceDevice is not
// targetDevice but there are no disadvantages in applying the same scheme.
// When partition is moved to the left, we start with the leftmost block,
// and move it further left, then second leftmost block and so on.
// But when we move partition to the right, we start with rightmost block.
// To account for this difference, we introduce CopyDirection variable which takes
// care of some of the differences between these two cases.
// care of some of the differences in offset calculation between these two cases.
enum CopyDirection : qint8 {
Left = 1,
Right = -1,