// Copyright 2011 The Go Authors.  All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package syscall

const (
	// Windows errors.
	ERROR_FILE_NOT_FOUND      Errno = 2
	ERROR_PATH_NOT_FOUND      Errno = 3
	ERROR_ACCESS_DENIED       Errno = 5
	ERROR_NO_MORE_FILES       Errno = 18
	ERROR_BROKEN_PIPE         Errno = 109
	ERROR_BUFFER_OVERFLOW     Errno = 111
	ERROR_INSUFFICIENT_BUFFER Errno = 122
	ERROR_MOD_NOT_FOUND       Errno = 126
	ERROR_PROC_NOT_FOUND      Errno = 127
	ERROR_ENVVAR_NOT_FOUND    Errno = 203
	ERROR_OPERATION_ABORTED   Errno = 995
	ERROR_IO_PENDING          Errno = 997
)

const (
	// Invented values to support what package os expects.
	O_RDONLY   = 0x00000
	O_WRONLY   = 0x00001
	O_RDWR     = 0x00002
	O_CREAT    = 0x00040
	O_EXCL     = 0x00080
	O_NOCTTY   = 0x00100
	O_TRUNC    = 0x00200
	O_NONBLOCK = 0x00800
	O_APPEND   = 0x00400
	O_SYNC     = 0x01000
	O_ASYNC    = 0x02000
	O_CLOEXEC  = 0x80000
)

const (
	// More invented values for signals
	SIGHUP  = Signal(0x1)
	SIGINT  = Signal(0x2)
	SIGQUIT = Signal(0x3)
	SIGILL  = Signal(0x4)
	SIGTRAP = Signal(0x5)
	SIGABRT = Signal(0x6)
	SIGBUS  = Signal(0x7)
	SIGFPE  = Signal(0x8)
	SIGKILL = Signal(0x9)
	SIGSEGV = Signal(0xb)
	SIGPIPE = Signal(0xd)
	SIGALRM = Signal(0xe)
	SIGTERM = Signal(0xf)
)

var signals = [...]string{
	1:  "hangup",
	2:  "interrupt",
	3:  "quit",
	4:  "illegal instruction",
	5:  "trace/breakpoint trap",
	6:  "aborted",
	7:  "bus error",
	8:  "floating point exception",
	9:  "killed",
	10: "user defined signal 1",
	11: "segmentation fault",
	12: "user defined signal 2",
	13: "broken pipe",
	14: "alarm clock",
	15: "terminated",
}

const (
	GENERIC_READ    = 0x80000000
	GENERIC_WRITE   = 0x40000000
	GENERIC_EXECUTE = 0x20000000
	GENERIC_ALL     = 0x10000000

	FILE_LIST_DIRECTORY   = 0x00000001
	FILE_APPEND_DATA      = 0x00000004
	FILE_WRITE_ATTRIBUTES = 0x00000100

	FILE_SHARE_READ          = 0x00000001
	FILE_SHARE_WRITE         = 0x00000002
	FILE_SHARE_DELETE        = 0x00000004
	FILE_ATTRIBUTE_READONLY  = 0x00000001
	FILE_ATTRIBUTE_HIDDEN    = 0x00000002
	FILE_ATTRIBUTE_SYSTEM    = 0x00000004
	FILE_ATTRIBUTE_DIRECTORY = 0x00000010
	FILE_ATTRIBUTE_ARCHIVE   = 0x00000020
	FILE_ATTRIBUTE_NORMAL    = 0x00000080

	INVALID_FILE_ATTRIBUTES = 0xffffffff

	CREATE_NEW        = 1
	CREATE_ALWAYS     = 2
	OPEN_EXISTING     = 3
	OPEN_ALWAYS       = 4
	TRUNCATE_EXISTING = 5

	FILE_FLAG_BACKUP_SEMANTICS = 0x02000000
	FILE_FLAG_OVERLAPPED       = 0x40000000

	HANDLE_FLAG_INHERIT    = 0x00000001
	STARTF_USESTDHANDLES   = 0x00000100
	STARTF_USESHOWWINDOW   = 0x00000001
	DUPLICATE_CLOSE_SOURCE = 0x00000001
	DUPLICATE_SAME_ACCESS  = 0x00000002

	STD_INPUT_HANDLE  = -10
	STD_OUTPUT_HANDLE = -11
	STD_ERROR_HANDLE  = -12

	FILE_BEGIN   = 0
	FILE_CURRENT = 1
	FILE_END     = 2

	LANG_ENGLISH       = 0x09
	SUBLANG_ENGLISH_US = 0x01

	FORMAT_MESSAGE_ALLOCATE_BUFFER = 256
	FORMAT_MESSAGE_IGNORE_INSERTS  = 512
	FORMAT_MESSAGE_FROM_STRING     = 1024
	FORMAT_MESSAGE_FROM_HMODULE    = 2048
	FORMAT_MESSAGE_FROM_SYSTEM     = 4096
	FORMAT_MESSAGE_ARGUMENT_ARRAY  = 8192
	FORMAT_MESSAGE_MAX_WIDTH_MASK  = 255

	MAX_PATH      = 260
	MAX_LONG_PATH = 32768

	MAX_COMPUTERNAME_LENGTH = 15

	TIME_ZONE_ID_UNKNOWN  = 0
	TIME_ZONE_ID_STANDARD = 1

	TIME_ZONE_ID_DAYLIGHT = 2
	IGNORE                = 0
	INFINITE              = 0xffffffff

	WAIT_TIMEOUT   = 258
	WAIT_ABANDONED = 0x00000080
	WAIT_OBJECT_0  = 0x00000000
	WAIT_FAILED    = 0xFFFFFFFF

	CREATE_UNICODE_ENVIRONMENT = 0x00000400

	PROCESS_QUERY_INFORMATION = 0x00000400
	SYNCHRONIZE               = 0x00100000

	PAGE_READONLY          = 0x02
	PAGE_READWRITE         = 0x04
	PAGE_WRITECOPY         = 0x08
	PAGE_EXECUTE_READ      = 0x20
	PAGE_EXECUTE_READWRITE = 0x40
	PAGE_EXECUTE_WRITECOPY = 0x80

	FILE_MAP_COPY    = 0x01
	FILE_MAP_WRITE   = 0x02
	FILE_MAP_READ    = 0x04
	FILE_MAP_EXECUTE = 0x20
)

const (
	// do not reorder
	FILE_NOTIFY_CHANGE_FILE_NAME = 1 << iota
	FILE_NOTIFY_CHANGE_DIR_NAME
	FILE_NOTIFY_CHANGE_ATTRIBUTES
	FILE_NOTIFY_CHANGE_SIZE
	FILE_NOTIFY_CHANGE_LAST_WRITE
	FILE_NOTIFY_CHANGE_LAST_ACCESS
	FILE_NOTIFY_CHANGE_CREATION
)

const (
	// do not reorder
	FILE_ACTION_ADDED = iota + 1
	FILE_ACTION_REMOVED
	FILE_ACTION_MODIFIED
	FILE_ACTION_RENAMED_OLD_NAME
	FILE_ACTION_RENAMED_NEW_NAME
)

const (
	// wincrypt.h
	PROV_RSA_FULL                    = 1
	PROV_RSA_SIG                     = 2
	PROV_DSS                         = 3
	PROV_FORTEZZA                    = 4
	PROV_MS_EXCHANGE                 = 5
	PROV_SSL                         = 6
	PROV_RSA_SCHANNEL                = 12
	PROV_DSS_DH                      = 13
	PROV_EC_ECDSA_SIG                = 14
	PROV_EC_ECNRA_SIG                = 15
	PROV_EC_ECDSA_FULL               = 16
	PROV_EC_ECNRA_FULL               = 17
	PROV_DH_SCHANNEL                 = 18
	PROV_SPYRUS_LYNKS                = 20
	PROV_RNG                         = 21
	PROV_INTEL_SEC                   = 22
	PROV_REPLACE_OWF                 = 23
	PROV_RSA_AES                     = 24
	CRYPT_VERIFYCONTEXT              = 0xF0000000
	CRYPT_NEWKEYSET                  = 0x00000008
	CRYPT_DELETEKEYSET               = 0x00000010
	CRYPT_MACHINE_KEYSET             = 0x00000020
	CRYPT_SILENT                     = 0x00000040
	CRYPT_DEFAULT_CONTAINER_OPTIONAL = 0x00000080
)

// Invented values to support what package os expects.
type Timeval struct {
	Sec  int32
	Usec int32
}

func (tv *Timeval) Nanoseconds() int64 {
	return (int64(tv.Sec)*1e6 + int64(tv.Usec)) * 1e3
}

func NsecToTimeval(nsec int64) (tv Timeval) {
	tv.Sec = int32(nsec / 1e9)
	tv.Usec = int32(nsec % 1e9 / 1e3)
	return
}

type SecurityAttributes struct {
	Length             uint32
	SecurityDescriptor uintptr
	InheritHandle      uint32
}

type Overlapped struct {
	Internal     uintptr
	InternalHigh uintptr
	Offset       uint32
	OffsetHigh   uint32
	HEvent       Handle
}

type FileNotifyInformation struct {
	NextEntryOffset uint32
	Action          uint32
	FileNameLength  uint32
	FileName        uint16
}

type Filetime struct {
	LowDateTime  uint32
	HighDateTime uint32
}

func (ft *Filetime) Nanoseconds() int64 {
	// 100-nanosecond intervals since January 1, 1601
	nsec := int64(ft.HighDateTime)<<32 + int64(ft.LowDateTime)
	// change starting time to the Epoch (00:00:00 UTC, January 1, 1970)
	nsec -= 116444736000000000
	// convert into nanoseconds
	nsec *= 100
	return nsec
}

func NsecToFiletime(nsec int64) (ft Filetime) {
	// convert into 100-nanosecond
	nsec /= 100
	// change starting time to January 1, 1601
	nsec += 116444736000000000
	// split into high / low
	ft.LowDateTime = uint32(nsec & 0xffffffff)
	ft.HighDateTime = uint32(nsec >> 32 & 0xffffffff)
	return ft
}

type Win32finddata struct {
	FileAttributes    uint32
	CreationTime      Filetime
	LastAccessTime    Filetime
	LastWriteTime     Filetime
	FileSizeHigh      uint32
	FileSizeLow       uint32
	Reserved0         uint32
	Reserved1         uint32
	FileName          [MAX_PATH - 1]uint16
	AlternateFileName [13]uint16
}

type ByHandleFileInformation struct {
	FileAttributes     uint32
	CreationTime       Filetime
	LastAccessTime     Filetime
	LastWriteTime      Filetime
	VolumeSerialNumber uint32
	FileSizeHigh       uint32
	FileSizeLow        uint32
	NumberOfLinks      uint32
	FileIndexHigh      uint32
	FileIndexLow       uint32
}

const (
	GetFileExInfoStandard = 0
	GetFileExMaxInfoLevel = 1
)

type Win32FileAttributeData struct {
	FileAttributes uint32
	CreationTime   Filetime
	LastAccessTime Filetime
	LastWriteTime  Filetime
	FileSizeHigh   uint32
	FileSizeLow    uint32
}

// ShowWindow constants
const (
	// winuser.h
	SW_HIDE            = 0
	SW_NORMAL          = 1
	SW_SHOWNORMAL      = 1
	SW_SHOWMINIMIZED   = 2
	SW_SHOWMAXIMIZED   = 3
	SW_MAXIMIZE        = 3
	SW_SHOWNOACTIVATE  = 4
	SW_SHOW            = 5
	SW_MINIMIZE        = 6
	SW_SHOWMINNOACTIVE = 7
	SW_SHOWNA          = 8
	SW_RESTORE         = 9
	SW_SHOWDEFAULT     = 10
	SW_FORCEMINIMIZE   = 11
)

type StartupInfo struct {
	Cb            uint32
	_             *uint16
	Desktop       *uint16
	Title         *uint16
	X             uint32
	Y             uint32
	XSize         uint32
	YSize         uint32
	XCountChars   uint32
	YCountChars   uint32
	FillAttribute uint32
	Flags         uint32
	ShowWindow    uint16
	_             uint16
	_             *byte
	StdInput      Handle
	StdOutput     Handle
	StdErr        Handle
}

type ProcessInformation struct {
	Process   Handle
	Thread    Handle
	ProcessId uint32
	ThreadId  uint32
}

type Systemtime struct {
	Year         uint16
	Month        uint16
	DayOfWeek    uint16
	Day          uint16
	Hour         uint16
	Minute       uint16
	Second       uint16
	Milliseconds uint16
}

type Timezoneinformation struct {
	Bias         int32
	StandardName [32]uint16
	StandardDate Systemtime
	StandardBias int32
	DaylightName [32]uint16
	DaylightDate Systemtime
	DaylightBias int32
}

// Socket related.

const (
	AF_UNSPEC  = 0
	AF_UNIX    = 1
	AF_INET    = 2
	AF_INET6   = 23
	AF_NETBIOS = 17

	SOCK_STREAM    = 1
	SOCK_DGRAM     = 2
	SOCK_RAW       = 3
	SOCK_SEQPACKET = 5

	IPPROTO_IP   = 0
	IPPROTO_IPV6 = 0x29
	IPPROTO_TCP  = 6
	IPPROTO_UDP  = 17

	SOL_SOCKET               = 0xffff
	SO_REUSEADDR             = 4
	SO_KEEPALIVE             = 8
	SO_DONTROUTE             = 16
	SO_BROADCAST             = 32
	SO_LINGER                = 128
	SO_RCVBUF                = 0x1002
	SO_SNDBUF                = 0x1001
	SO_UPDATE_ACCEPT_CONTEXT = 0x700b

	// cf. http://support.microsoft.com/default.aspx?scid=kb;en-us;257460

	IP_TOS             = 0x3
	IP_TTL             = 0x4
	IP_MULTICAST_IF    = 0x9
	IP_MULTICAST_TTL   = 0xa
	IP_MULTICAST_LOOP  = 0xb
	IP_ADD_MEMBERSHIP  = 0xc
	IP_DROP_MEMBERSHIP = 0xd

	IPV6_V6ONLY         = 0x1b
	IPV6_UNICAST_HOPS   = 0x4
	IPV6_MULTICAST_IF   = 0x9
	IPV6_MULTICAST_HOPS = 0xa
	IPV6_MULTICAST_LOOP = 0xb
	IPV6_JOIN_GROUP     = 0xc
	IPV6_LEAVE_GROUP    = 0xd

	SOMAXCONN = 0x7fffffff

	TCP_NODELAY = 1

	SHUT_RD   = 0
	SHUT_WR   = 1
	SHUT_RDWR = 2

	WSADESCRIPTION_LEN = 256
	WSASYS_STATUS_LEN  = 128
)

type WSABuf struct {
	Len uint32
	Buf *byte
}

// Invented values to support what package os expects.
const (
	S_IFMT   = 0x1f000
	S_IFIFO  = 0x1000
	S_IFCHR  = 0x2000
	S_IFDIR  = 0x4000
	S_IFBLK  = 0x6000
	S_IFREG  = 0x8000
	S_IFLNK  = 0xa000
	S_IFSOCK = 0xc000
	S_ISUID  = 0x800
	S_ISGID  = 0x400
	S_ISVTX  = 0x200
	S_IRUSR  = 0x100
	S_IWRITE = 0x80
	S_IWUSR  = 0x80
	S_IXUSR  = 0x40
)

const (
	FILE_TYPE_CHAR    = 0x0002
	FILE_TYPE_DISK    = 0x0001
	FILE_TYPE_PIPE    = 0x0003
	FILE_TYPE_REMOTE  = 0x8000
	FILE_TYPE_UNKNOWN = 0x0000
)

type Hostent struct {
	Name     *byte
	Aliases  **byte
	AddrType uint16
	Length   uint16
	AddrList **byte
}

type Protoent struct {
	Name    *byte
	Aliases **byte
	Proto   uint16
}

const (
	DNS_TYPE_A       = 0x0001
	DNS_TYPE_NS      = 0x0002
	DNS_TYPE_MD      = 0x0003
	DNS_TYPE_MF      = 0x0004
	DNS_TYPE_CNAME   = 0x0005
	DNS_TYPE_SOA     = 0x0006
	DNS_TYPE_MB      = 0x0007
	DNS_TYPE_MG      = 0x0008
	DNS_TYPE_MR      = 0x0009
	DNS_TYPE_NULL    = 0x000a
	DNS_TYPE_WKS     = 0x000b
	DNS_TYPE_PTR     = 0x000c
	DNS_TYPE_HINFO   = 0x000d
	DNS_TYPE_MINFO   = 0x000e
	DNS_TYPE_MX      = 0x000f
	DNS_TYPE_TEXT    = 0x0010
	DNS_TYPE_RP      = 0x0011
	DNS_TYPE_AFSDB   = 0x0012
	DNS_TYPE_X25     = 0x0013
	DNS_TYPE_ISDN    = 0x0014
	DNS_TYPE_RT      = 0x0015
	DNS_TYPE_NSAP    = 0x0016
	DNS_TYPE_NSAPPTR = 0x0017
	DNS_TYPE_SIG     = 0x0018
	DNS_TYPE_KEY     = 0x0019
	DNS_TYPE_PX      = 0x001a
	DNS_TYPE_GPOS    = 0x001b
	DNS_TYPE_AAAA    = 0x001c
	DNS_TYPE_LOC     = 0x001d
	DNS_TYPE_NXT     = 0x001e
	DNS_TYPE_EID     = 0x001f
	DNS_TYPE_NIMLOC  = 0x0020
	DNS_TYPE_SRV     = 0x0021
	DNS_TYPE_ATMA    = 0x0022
	DNS_TYPE_NAPTR   = 0x0023
	DNS_TYPE_KX      = 0x0024
	DNS_TYPE_CERT    = 0x0025
	DNS_TYPE_A6      = 0x0026
	DNS_TYPE_DNAME   = 0x0027
	DNS_TYPE_SINK    = 0x0028
	DNS_TYPE_OPT     = 0x0029
	DNS_TYPE_DS      = 0x002B
	DNS_TYPE_RRSIG   = 0x002E
	DNS_TYPE_NSEC    = 0x002F
	DNS_TYPE_DNSKEY  = 0x0030
	DNS_TYPE_DHCID   = 0x0031
	DNS_TYPE_UINFO   = 0x0064
	DNS_TYPE_UID     = 0x0065
	DNS_TYPE_GID     = 0x0066
	DNS_TYPE_UNSPEC  = 0x0067
	DNS_TYPE_ADDRS   = 0x00f8
	DNS_TYPE_TKEY    = 0x00f9
	DNS_TYPE_TSIG    = 0x00fa
	DNS_TYPE_IXFR    = 0x00fb
	DNS_TYPE_AXFR    = 0x00fc
	DNS_TYPE_MAILB   = 0x00fd
	DNS_TYPE_MAILA   = 0x00fe
	DNS_TYPE_ALL     = 0x00ff
	DNS_TYPE_ANY     = 0x00ff
	DNS_TYPE_WINS    = 0xff01
	DNS_TYPE_WINSR   = 0xff02
	DNS_TYPE_NBSTAT  = 0xff01
)

type DNSSRVData struct {
	Target   *uint16
	Priority uint16
	Weight   uint16
	Port     uint16
	Pad      uint16
}

type DNSPTRData struct {
	Host *uint16
}

type DNSMXData struct {
	NameExchange *uint16
	Preference   uint16
	Pad          uint16
}

type DNSTXTData struct {
	StringCount uint16
	StringArray [1]*uint16
}

type DNSRecord struct {
	Next     *DNSRecord
	Name     *uint16
	Type     uint16
	Length   uint16
	Dw       uint32
	Ttl      uint32
	Reserved uint32
	Data     [40]byte
}

const (
	TF_DISCONNECT         = 1
	TF_REUSE_SOCKET       = 2
	TF_WRITE_BEHIND       = 4
	TF_USE_DEFAULT_WORKER = 0
	TF_USE_SYSTEM_THREAD  = 16
	TF_USE_KERNEL_APC     = 32
)

type TransmitFileBuffers struct {
	Head       uintptr
	HeadLength uint32
	Tail       uintptr
	TailLength uint32
}

const (
	IFF_UP           = 1
	IFF_BROADCAST    = 2
	IFF_LOOPBACK     = 4
	IFF_POINTTOPOINT = 8
	IFF_MULTICAST    = 16
)

const SIO_GET_INTERFACE_LIST = 0x4004747F

// TODO(mattn): SockaddrGen is union of sockaddr/sockaddr_in/sockaddr_in6_old.
// will be fixed to change variable type as suitable.

type SockaddrGen [24]byte

type InterfaceInfo struct {
	Flags            uint32
	Address          SockaddrGen
	BroadcastAddress SockaddrGen
	Netmask          SockaddrGen
}

type IpAddressString struct {
	String [16]byte
}

type IpMaskString IpAddressString

type IpAddrString struct {
	Next      *IpAddrString
	IpAddress IpAddressString
	IpMask    IpMaskString
	Context   uint32
}

const MAX_ADAPTER_NAME_LENGTH = 256
const MAX_ADAPTER_DESCRIPTION_LENGTH = 128
const MAX_ADAPTER_ADDRESS_LENGTH = 8

type IpAdapterInfo struct {
	Next                *IpAdapterInfo
	ComboIndex          uint32
	AdapterName         [MAX_ADAPTER_NAME_LENGTH + 4]byte
	Description         [MAX_ADAPTER_DESCRIPTION_LENGTH + 4]byte
	AddressLength       uint32
	Address             [MAX_ADAPTER_ADDRESS_LENGTH]byte
	Index               uint32
	Type                uint32
	DhcpEnabled         uint32
	CurrentIpAddress    *IpAddrString
	IpAddressList       IpAddrString
	GatewayList         IpAddrString
	DhcpServer          IpAddrString
	HaveWins            bool
	PrimaryWinsServer   IpAddrString
	SecondaryWinsServer IpAddrString
	LeaseObtained       int64
	LeaseExpires        int64
}

const MAXLEN_PHYSADDR = 8
const MAX_INTERFACE_NAME_LEN = 256
const MAXLEN_IFDESCR = 256

type MibIfRow struct {
	Name            [MAX_INTERFACE_NAME_LEN]uint16
	Index           uint32
	Type            uint32
	Mtu             uint32
	Speed           uint32
	PhysAddrLen     uint32
	PhysAddr        [MAXLEN_PHYSADDR]byte
	AdminStatus     uint32
	OperStatus      uint32
	LastChange      uint32
	InOctets        uint32
	InUcastPkts     uint32
	InNUcastPkts    uint32
	InDiscards      uint32
	InErrors        uint32
	InUnknownProtos uint32
	OutOctets       uint32
	OutUcastPkts    uint32
	OutNUcastPkts   uint32
	OutDiscards     uint32
	OutErrors       uint32
	OutQLen         uint32
	DescrLen        uint32
	Descr           [MAXLEN_IFDESCR]byte
}

type CertContext struct {
	EncodingType uint32
	EncodedCert  *byte
	Length       uint32
	CertInfo     uintptr
	Store        Handle
}

const (
	// do not reorder
	HKEY_CLASSES_ROOT = 0x80000000 + iota
	HKEY_CURRENT_USER
	HKEY_LOCAL_MACHINE
	HKEY_USERS
	HKEY_PERFORMANCE_DATA
	HKEY_CURRENT_CONFIG
	HKEY_DYN_DATA

	KEY_QUERY_VALUE        = 1
	KEY_SET_VALUE          = 2
	KEY_CREATE_SUB_KEY     = 4
	KEY_ENUMERATE_SUB_KEYS = 8
	KEY_NOTIFY             = 16
	KEY_CREATE_LINK        = 32
	KEY_WRITE              = 0x20006
	KEY_EXECUTE            = 0x20019
	KEY_READ               = 0x20019
	KEY_WOW64_64KEY        = 0x0100
	KEY_WOW64_32KEY        = 0x0200
	KEY_ALL_ACCESS         = 0xf003f
)

const (
	// do not reorder
	REG_NONE = iota
	REG_SZ
	REG_EXPAND_SZ
	REG_BINARY
	REG_DWORD_LITTLE_ENDIAN
	REG_DWORD_BIG_ENDIAN
	REG_LINK
	REG_MULTI_SZ
	REG_RESOURCE_LIST
	REG_FULL_RESOURCE_DESCRIPTOR
	REG_RESOURCE_REQUIREMENTS_LIST
	REG_QWORD_LITTLE_ENDIAN
	REG_DWORD = REG_DWORD_LITTLE_ENDIAN
	REG_QWORD = REG_QWORD_LITTLE_ENDIAN
)