mirror of
https://github.com/RGBCube/serenity
synced 2025-10-31 16:42:44 +00:00
82 lines
2.2 KiB
C++
82 lines
2.2 KiB
C++
#define _FILE_OFFSET_BITS 64
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#include "FileBackedDiskDevice.h"
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#include <cstring>
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#include <sys/stat.h>
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//#define FBBD_DEBUG
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#define IGNORE_FILE_LENGTH // Useful for e.g /dev/hda2
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RetainPtr<FileBackedDiskDevice> FileBackedDiskDevice::create(String&& imagePath, unsigned blockSize)
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{
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return adopt(*new FileBackedDiskDevice(std::move(imagePath), blockSize));
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}
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FileBackedDiskDevice::FileBackedDiskDevice(String&& imagePath, unsigned blockSize)
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: m_imagePath(std::move(imagePath))
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, m_blockSize(blockSize)
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{
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struct stat st;
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int result = stat(m_imagePath.characters(), &st);
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ASSERT(result != -1);
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m_fileLength = st.st_size;
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m_file = fopen(m_imagePath.characters(), "r+");
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}
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FileBackedDiskDevice::~FileBackedDiskDevice()
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{
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}
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unsigned FileBackedDiskDevice::blockSize() const
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{
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return m_blockSize;
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}
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bool FileBackedDiskDevice::readBlock(unsigned index, byte* out) const
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{
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DiskOffset offset = index * m_blockSize;
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return readInternal(offset, blockSize(), out);
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}
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bool FileBackedDiskDevice::writeBlock(unsigned index, const byte* data)
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{
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DiskOffset offset = index * m_blockSize;
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return writeInternal(offset, blockSize(), data);
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}
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bool FileBackedDiskDevice::readInternal(DiskOffset offset, unsigned length, byte* out) const
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{
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#ifndef IGNORE_FILE_LENGTH
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if (offset + length >= m_fileLength)
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return false;
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#endif
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#ifdef FBBD_DEBUG
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printf("[FileBackedDiskDevice] Read device @ offset %llx, length %u\n", offset, length);
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#endif
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fseeko(m_file, offset, SEEK_SET);
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unsigned nread = fread(out, sizeof(byte), length, m_file);
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ASSERT(nread == length);
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return true;
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}
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bool FileBackedDiskDevice::writeInternal(DiskOffset offset, unsigned length, const byte* data)
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{
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#ifndef IGNORE_FILE_LENGTH
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if (offset + length >= m_fileLength)
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return false;
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#endif
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#ifdef FBBD_DEBUG
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printf("[FileBackedDiskDevice] Write device @ offset %llx, length %u\n", offset, length);
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#endif
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fseeko(m_file, offset, SEEK_SET);
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// size_t fwrite(const void *ptr, size_t size, size_t nmemb, FILE *stream);
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unsigned nwritten = fwrite(data, sizeof(byte), length, m_file);
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ASSERT(nwritten == length);
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return true;
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}
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const char* FileBackedDiskDevice::className() const
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{
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return "FileBackedDiskDevice";
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}
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