Method ReadSLEB128

view/sharedcache/core/VirtualMemory.cpp:210–244

}

int64_t VirtualMemoryReader::ReadSLEB128(size_t cursorLimit)
{
	constexpr size_t BYTE_SIZE = 7;    // Number of bits in each SLEB128 byte
	constexpr size_t INT64_BITS = 64;  // Total number of bits in an int64_t

	int64_t value = 0;
	size_t shift = 0;
	uint64_t offset;

	// Retrieve associated memory region and the file buffer
	auto mapping = m_memory->GetRegionAtAddress(m_cursor, offset);
	auto fileLimit = offset + (cursorLimit - m_cursor);
	auto fileAccessor = mapping->fileAccessor.lock();
	auto* fileBuffer = static_cast<uint8_t*>(fileAccessor->Data());

	// Loop through the SLEB128 encoded bytes
	while (offset < fileLimit)
	{
		uint8_t currentByte = fileBuffer[offset++];
		value |= (static_cast<int64_t>(currentByte & 0x7F) << shift);
		shift += BYTE_SIZE;

		if ((currentByte & 0x80) == 0)  // If MSB is not set, we're done
			break;
	}

	// Properly sign-extend the value according to its size
	value = (value << (INT64_BITS - shift)) >> (INT64_BITS - shift);

	// TODO: There has got to be a better way to prevent this...
	// Prevent deallocation of the fileAccessor
	fileAccessor->Data();

	return value;
}

uint64_t VirtualMemoryReader::ReadPointer()
{