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a403df4385
When no more directory entries are available in the existing cluster(s) of a directory on FAT32, we allocate an extra cluster. Make sure to zero out that new cluster, as disk checking utilities may not stop reading when reaching an end of directory marker but read the rest of cluster as well. So there must not be any garbage data from a previously deleted file in the sector there. Also add checks to prevent getting in an endless loop on encoutering circular "next cluster" references.
55 lines
1.9 KiB
C++
55 lines
1.9 KiB
C++
#ifndef DEVICEWRAPPERFATPARTITION_H
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#define DEVICEWRAPPERFATPARTITION_H
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/*
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* SPDX-License-Identifier: Apache-2.0
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* Copyright (C) 2022 Raspberry Pi Ltd
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*/
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#include "devicewrapperpartition.h"
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#include <QObject>
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#include <QDate>
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#include <QTime>
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enum fatType { FAT12, FAT16, FAT32, EXFAT };
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struct dir_entry;
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class DeviceWrapperFatPartition : public DeviceWrapperPartition
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{
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Q_OBJECT
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public:
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DeviceWrapperFatPartition(DeviceWrapper *dw, quint64 partStart, quint64 partLen, QObject *parent = nullptr);
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QByteArray readFile(const QString &filename);
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void writeFile(const QString &filename, const QByteArray &contents);
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bool fileExists(const QString &filename);
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protected:
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enum fatType _type;
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uint32_t _firstFatStartOffset, _fatSize, _bytesPerCluster, _clusterOffset;
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uint32_t _fat16_rootDirSectors, _fat16_firstRootDirSector;
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uint32_t _fat32_firstRootDirCluster, _fat32_currentRootDirCluster;
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uint16_t _bytesPerSector, _fat32_fsinfoSector;
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QList<uint32_t> _fatStartOffset;
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QList<uint32_t> _currentDirClusters;
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QList<uint32_t> getClusterChain(uint32_t firstCluster);
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void setFAT16(uint16_t cluster, uint16_t value);
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void setFAT32(uint32_t cluster, uint32_t value);
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void setFAT(uint32_t cluster, uint32_t value);
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uint32_t getFAT(uint32_t cluster);
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void seekCluster(uint32_t cluster);
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uint32_t allocateCluster();
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uint32_t allocateCluster(uint32_t previousCluster);
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bool getDirEntry(const QString &longFilename, struct dir_entry *entry, bool createIfNotExist = false);
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bool dirNameExists(const QByteArray dirname);
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void updateDirEntry(struct dir_entry *dirEntry);
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void writeDirEntryAtCurrentPos(struct dir_entry *dirEntry);
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void openDir();
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bool readDir(struct dir_entry *result);
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void updateFSinfo(int deltaClusters, uint32_t nextFreeClusterHint);
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uint16_t QTimeToFATtime(const QTime &time);
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uint16_t QDateToFATdate(const QDate &date);
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};
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#endif // DEVICEWRAPPERFATPARTITION_H
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