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calamares/src/libcalamares/partition/PartitionSize.h
Callum Farmer 0c4dc71d5c [libcalamares] Update SPDX identifiers. 
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2020-06-03 12:52:53 +01:00

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/* === This file is part of Calamares - <https://github.com/calamares> ===
*
* SPDX-FileCopyrightText: 2019 Collabora Ltd <arnaud.ferraris@collabora.com>
* SPDX-FileCopyrightText: 2019 Adriaan de Groot <groot@kde.org>
*
* Calamares is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Calamares is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Calamares. If not, see <http://www.gnu.org/licenses/>.
*
* SPDX-License-Identifier: GPL-3.0-or-later
* License-Filename: LICENSE
*
*/
#ifndef PARTITION_PARTITIONSIZE_H
#define PARTITION_PARTITIONSIZE_H
#include "utils/NamedSuffix.h"
#include "utils/Units.h"
// Qt
#include <QString>
namespace CalamaresUtils
{
namespace Partition
{
enum class SizeUnit
{
None,
Percent,
Byte,
KB,
KiB,
MB,
MiB,
GB,
GiB
};
/** @brief Partition size expressions
*
* Sizes can be specified in bytes, KiB, MiB, GiB or percent (of
* the available drive space are on). This class handles parsing
* of such strings from the config file.
*/
class PartitionSize : public NamedSuffix< SizeUnit, SizeUnit::None >
{
public:
PartitionSize()
: NamedSuffix()
{
}
PartitionSize( int v, SizeUnit u )
: NamedSuffix( v, u )
{
}
PartitionSize( const QString& );
bool isValid() const { return ( unit() != SizeUnit::None ) && ( value() > 0 ); }
bool operator<( const PartitionSize& other ) const;
bool operator>( const PartitionSize& other ) const;
bool operator==( const PartitionSize& other ) const;
/** @brief Convert the size to the number of sectors @p totalSectors .
*
* Each sector has size @p sectorSize, for converting sizes in Bytes,
* KiB, MiB or GiB to sector counts.
*
* @return the number of sectors needed, or -1 for invalid sizes.
*/
qint64 toSectors( qint64 totalSectors, qint64 sectorSize ) const;
/** @brief Convert the size to bytes.
*
* The device's sectors count @p totalSectors and sector size
* @p sectoreSize are used to calculated the total size, which
* is then used to calculate the size when using Percent.
*
* @return the size in bytes, or -1 for invalid sizes.
*/
qint64 toBytes( qint64 totalSectors, qint64 sectorSize ) const;
/** @brief Convert the size to bytes.
*
* Total size @p totalBytes is needed for sizes in Percent. This
* parameter is unused in any other case.
*
* @return the size in bytes, or -1 for invalid sizes.
*/
qint64 toBytes( qint64 totalBytes ) const;
/** @brief Convert the size to bytes.
*
* This method is only valid for sizes in Bytes, KiB, MiB or GiB.
* It will return -1 in any other case. Note that 0KiB and 0MiB and
* 0GiB are considered **invalid** sizes and return -1.
*
* @return the size in bytes, or -1 if it cannot be calculated.
*/
qint64 toBytes() const;
/** @brief Are the units comparable?
*
* None units cannot be compared with anything. Percentages can
* be compared with each other, and all the explicit sizes (KiB, ...)
* can be compared with each other.
*/
static constexpr bool unitsComparable( const SizeUnit u1, const SizeUnit u2 )
{
return !( ( u1 == SizeUnit::None || u2 == SizeUnit::None )
|| ( u1 == SizeUnit::Percent && u2 != SizeUnit::Percent )
|| ( u1 != SizeUnit::Percent && u2 == SizeUnit::Percent ) );
}
};
} // namespace Partition
} // namespace CalamaresUtils
#endif // PARTITION_PARTITIONSIZE_H
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