Function unpack

src/jrd/vio.cpp:573–601

namespace
{
	inline UCHAR* unpack(record_param* rpb, ULONG outLength, UCHAR* output)
	{
		if (rpb->rpb_flags & rpb_not_packed)
		{
			const auto length = MIN(rpb->rpb_length, outLength);

			memcpy(output, rpb->rpb_address, length);
			output += length;

			if (rpb->rpb_length > length)
			{
				// Short records may be zero-padded up to the fragmented header size.
				// Take it into account while checking for a possible buffer overrun.

				auto tail = rpb->rpb_address + length;
				const auto end = rpb->rpb_address + rpb->rpb_length;

				while (tail < end)
				{
					if (*tail++)
						BUGCHECK(179);	// msg 179 decompression overran buffer
				}
			}

			return output;
		}

		return Compressor::unpack(rpb->rpb_length, rpb->rpb_address, outLength, output);
	}
};