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https://github.com/LadybirdBrowser/ladybird.git
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5254a320d8
This is obviously more readable. If we ever run into a situation where ref count churn is actually causing trouble in the future, we can deal with it then. For now, let's keep it simple. :^)
70 lines
1.7 KiB
C++
70 lines
1.7 KiB
C++
#include <AK/ByteBuffer.h>
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#include <Kernel/Devices/MBRPartitionTable.h>
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#define MBR_DEBUG
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MBRPartitionTable::MBRPartitionTable(NonnullRefPtr<DiskDevice> device)
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: m_device(move(device))
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{
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}
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MBRPartitionTable::~MBRPartitionTable()
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{
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}
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const MBRPartitionHeader& MBRPartitionTable::header() const
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{
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return *reinterpret_cast<const MBRPartitionHeader*>(m_cached_header);
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}
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bool MBRPartitionTable::initialize()
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{
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if (!m_device->read_block(0, m_cached_header)) {
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return false;
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}
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auto& header = this->header();
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#ifdef MBR_DEBUG
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kprintf("MBRPartitionTable::initialize: mbr_signature=%#x\n", header.mbr_signature);
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#endif
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if (header.mbr_signature != MBR_SIGNATURE) {
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kprintf("MBRPartitionTable::initialize: bad mbr signature %#x\n", header.mbr_signature);
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return false;
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}
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return true;
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}
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RefPtr<DiskPartition> MBRPartitionTable::partition(unsigned index)
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{
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ASSERT(index >= 1 && index <= 4);
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auto& header = this->header();
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auto& entry = header.entry[index - 1];
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if (header.mbr_signature != MBR_SIGNATURE) {
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kprintf("MBRPartitionTable::initialize: bad mbr signature - not initalized? %#x\n", header.mbr_signature);
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return nullptr;
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}
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#ifdef MBR_DEBUG
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kprintf("MBRPartitionTable::partition: status=%#x offset=%#x\n", entry.status, entry.offset);
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#endif
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if (entry.offset == 0x00) {
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#ifdef MBR_DEBUG
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kprintf("MBRPartitionTable::partition: missing partition requested index=%d\n", index);
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#endif
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return nullptr;
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}
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#ifdef MBR_DEBUG
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kprintf("MBRPartitionTable::partition: found partition index=%d type=%x\n", index, entry.type);
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#endif
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return DiskPartition::create(m_device, entry.offset);
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}
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