mirror of
https://github.com/SerenityOS/serenity
synced 2024-10-17 21:32:48 +00:00
76 lines
2.2 KiB
C++
76 lines
2.2 KiB
C++
#include "DiskBackedFileSystem.h"
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#include "i386.h"
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//#define DBFS_DEBUG
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DiskBackedFS::DiskBackedFS(RetainPtr<DiskDevice>&& device)
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: m_device(move(device))
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{
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ASSERT(m_device);
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}
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DiskBackedFS::~DiskBackedFS()
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{
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}
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bool DiskBackedFS::write_block(unsigned index, const ByteBuffer& data)
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{
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#ifdef DBFS_DEBUG
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kprintf("DiskBackedFileSystem::write_block %u, size=%u\n", index, data.size());
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#endif
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ASSERT(data.size() == block_size());
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DiskOffset base_offset = static_cast<DiskOffset>(index) * static_cast<DiskOffset>(block_size());
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return device().write(base_offset, block_size(), data.pointer());
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}
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bool DiskBackedFS::write_blocks(unsigned index, unsigned count, const ByteBuffer& data)
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{
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#ifdef DBFS_DEBUG
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kprintf("DiskBackedFileSystem::write_blocks %u x%u\n", index, count);
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#endif
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DiskOffset base_offset = static_cast<DiskOffset>(index) * static_cast<DiskOffset>(block_size());
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return device().write(base_offset, count * block_size(), data.pointer());
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}
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ByteBuffer DiskBackedFS::read_block(unsigned index) const
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{
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#ifdef DBFS_DEBUG
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kprintf("DiskBackedFileSystem::read_block %u\n", index);
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#endif
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auto buffer = ByteBuffer::create_uninitialized(block_size());
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//kprintf("created block buffer with size %u\n", block_size());
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DiskOffset base_offset = static_cast<DiskOffset>(index) * static_cast<DiskOffset>(block_size());
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auto* buffer_pointer = buffer.pointer();
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bool success = device().read(base_offset, block_size(), buffer_pointer);
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ASSERT(success);
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ASSERT(buffer.size() == block_size());
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return buffer;
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}
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ByteBuffer DiskBackedFS::read_blocks(unsigned index, unsigned count) const
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{
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if (!count)
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return nullptr;
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if (count == 1)
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return read_block(index);
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auto blocks = ByteBuffer::create_uninitialized(count * block_size());
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byte* out = blocks.pointer();
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for (unsigned i = 0; i < count; ++i) {
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auto block = read_block(index + i);
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if (!block)
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return nullptr;
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memcpy(out, block.pointer(), block.size());
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out += block_size();
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}
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return blocks;
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}
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void DiskBackedFS::set_block_size(unsigned block_size)
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{
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if (block_size == m_block_size)
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return;
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m_block_size = block_size;
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}
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