// least-significant bits of the rune).
//
// See the definitions below for a more detailed description of the various
// bits.
type info uint16

const (
	casedMask      = 0x0003
	fullCasedMask  = 0x0007
	ignorableMask  = 0x0006
	ignorableValue = 0x0004

	inverseFoldBit = 1 << 7
	isMidBit       = 1 << 6

	exceptionBit     = 1 << 3
	exceptionShift   = 4
	numExceptionBits = 12

	nonceSize int
	aead      func([]byte) (cipher.AEAD, error)
}{
	// RFC 9180, Section 7.3
	0x0001: {keySize: 16, nonceSize: 12, aead: aesGCMNew},
	0x0002: {keySize: 32, nonceSize: 12, aead: aesGCMNew},
	0x0003: {keySize: chacha20poly1305.KeySize, nonceSize: chacha20poly1305.NonceSize, aead: chacha20poly1305.New},
}

var SupportedKDFs = map[uint16]func() *hkdfKDF{
	// RFC 9180, Section 7.2

	IMAGE_REL_I386_REL32             = 0x0014
	IMAGE_REL_AMD64_ABSOLUTE         = 0x0000
	IMAGE_REL_AMD64_ADDR64           = 0x0001
	IMAGE_REL_AMD64_ADDR32           = 0x0002
	IMAGE_REL_AMD64_ADDR32NB         = 0x0003
	IMAGE_REL_AMD64_REL32            = 0x0004
	IMAGE_REL_AMD64_REL32_1          = 0x0005
	IMAGE_REL_AMD64_REL32_2          = 0x0006
	IMAGE_REL_AMD64_REL32_3          = 0x0007
	IMAGE_REL_AMD64_REL32_4          = 0x0008

	0x1436: 0x0002, 0x1437: 0x0002, 0x1438: 0x0002, 0x1439: 0x0002, 0x143a: 0x0003, 0x143b: 0x0003,
	0x143c: 0x000a, 0x143d: 0x009a, 0x143e: 0x008a,
	// Block 0x51, offset 0x1440
	0x1440: 0x0002, 0x1441: 0x0002, 0x1442: 0x0002, 0x1443: 0x0002, 0x1444: 0x0002, 0x1445: 0x0002,
	0x1446: 0x0002, 0x1447: 0x0002, 0x1448: 0x0002, 0x1449: 0x0002, 0x144a: 0x0003, 0x144b: 0x0003,
	0x144c: 0x000a, 0x144d: 0x009a, 0x144e: 0x008a,

	0x1436: 0x0002, 0x1437: 0x0002, 0x1438: 0x0002, 0x1439: 0x0002, 0x143a: 0x0003, 0x143b: 0x0003,
	0x143c: 0x000a, 0x143d: 0x009a, 0x143e: 0x008a,
	// Block 0x51, offset 0x1440
	0x1440: 0x0002, 0x1441: 0x0002, 0x1442: 0x0002, 0x1443: 0x0002, 0x1444: 0x0002, 0x1445: 0x0002,
	0x1446: 0x0002, 0x1447: 0x0002, 0x1448: 0x0002, 0x1449: 0x0002, 0x144a: 0x0003, 0x144b: 0x0003,
	0x144c: 0x000a, 0x144d: 0x009a, 0x144e: 0x008a,

	0x14b6: 0x0002, 0x14b7: 0x0002, 0x14b8: 0x0002, 0x14b9: 0x0002, 0x14ba: 0x0003, 0x14bb: 0x0003,
	0x14bc: 0x000a, 0x14bd: 0x009a, 0x14be: 0x008a,
	// Block 0x53, offset 0x14c0
	0x14c0: 0x0002, 0x14c1: 0x0002, 0x14c2: 0x0002, 0x14c3: 0x0002, 0x14c4: 0x0002, 0x14c5: 0x0002,
	0x14c6: 0x0002, 0x14c7: 0x0002, 0x14c8: 0x0002, 0x14c9: 0x0002, 0x14ca: 0x0003, 0x14cb: 0x0003,
	0x14cc: 0x000a, 0x14cd: 0x009a, 0x14ce: 0x008a,

	0x1476: 0x0002, 0x1477: 0x0002, 0x1478: 0x0002, 0x1479: 0x0002, 0x147a: 0x0003, 0x147b: 0x0003,
	0x147c: 0x000a, 0x147d: 0x009a, 0x147e: 0x008a,
	// Block 0x52, offset 0x1480
	0x1480: 0x0002, 0x1481: 0x0002, 0x1482: 0x0002, 0x1483: 0x0002, 0x1484: 0x0002, 0x1485: 0x0002,
	0x1486: 0x0002, 0x1487: 0x0002, 0x1488: 0x0002, 0x1489: 0x0002, 0x148a: 0x0003, 0x148b: 0x0003,
	0x148c: 0x000a, 0x148d: 0x009a, 0x148e: 0x008a,

	EPOLL_CTL_ADD            = 0
	EPOLL_CTL_MOD            = 1
	EPOLL_CTL_DEL            = 2
	EPOLLRDNORM              = 0x0001
	EPOLLRDBAND              = 0x0002
	EPOLLIN                  = 0x0003
	EPOLLOUT                 = 0x0004
	EPOLLWRBAND              = 0x0008
	EPOLLPRI                 = 0x0010
	EPOLLERR                 = 0x0020
	EPOLLHUP                 = 0x0040
	EPOLLEXCLUSIVE           = 0x20000000

	IMAGE_REL_AMD64_ADDR64   = 0x0001
	IMAGE_REL_AMD64_ADDR32   = 0x0002
	IMAGE_REL_AMD64_ADDR32NB = 0x0003
	IMAGE_REL_AMD64_REL32    = 0x0004
	IMAGE_REL_AMD64_SECREL   = 0x000B

	IMAGE_REL_ARM_ABSOLUTE = 0x0000
	IMAGE_REL_ARM_ADDR32   = 0x0001
	IMAGE_REL_ARM_ADDR32NB = 0x0002
	IMAGE_REL_ARM_BRANCH24 = 0x0003
	IMAGE_REL_ARM_BRANCH11 = 0x0004
	IMAGE_REL_ARM_SECREL   = 0x000F

		v := (*syscall.DNSPTRData)(unsafe.Pointer(&p.Data[0]))
		ptrs = append(ptrs, absDomainName(windows.UTF16PtrToString(v.Host)))
	}
	return ptrs, nil
}

const dnsSectionMask = 0x0003

// returns only results applicable to name and resolves CNAME entries.
func validRecs(r *syscall.DNSRecord, dnstype uint16, name string) []*syscall.DNSRecord {
	cname := syscall.StringToUTF16Ptr(name)