Method GetCRC

pcsx2/SIO/Memcard/MemoryCardFile.cpp:527–564

}

u64 FileMemoryCard::GetCRC(uint slot)
{
	std::FILE* mcfp = m_file[slot];
	if (!mcfp)
		return 0;

	u64 retval = 0;

	if (m_ispsx[slot])
	{
		if (!Seek(mcfp, 0))
			return 0;

		const s64 mcfpsize = m_fileSize[slot];
		if (mcfpsize < 0)
			return 0;

		// Process the file in 4k chunks.  Speeds things up significantly.

		u64 buffer[528 * 8]; // use 528 (sector size), ensures even divisibility

		const uint filesize = static_cast<uint>(mcfpsize) / sizeof(buffer);
		for (uint i = filesize; i; --i)
		{
			if (std::fread(buffer, sizeof(buffer), 1, mcfp) != 1)
				return 0;

			for (uint t = 0; t < std::size(buffer); ++t)
				retval ^= buffer[t];
		}
	}
	else
	{
		retval = m_chksum[slot];
	}

	return retval;
}

// --------------------------------------------------------------------------------------
//  MemoryCard Component API Bindings