TCP (Transmission Control Protocol) segment: Go parsing library

// Code generated by kaitai-struct-compiler from a .ksy source file. DO NOT EDIT.

import "github.com/kaitai-io/kaitai_struct_go_runtime/kaitai"


/**
 * TCP is one of the core Internet protocols on transport layer (AKA
 * OSI layer 4), providing stateful connections with error checking,
 * guarantees of delivery, order of segments and avoidance of duplicate
 * delivery.
 */
type TcpSegment struct {
	SrcPort uint16
	DstPort uint16
	SeqNum uint32
	AckNum uint32
	DataOffset uint64
	Reserved uint64
	Flags *TcpSegment_Flags
	WindowSize uint16
	Checksum uint16
	UrgentPointer uint16
	Options []byte
	Body []byte
	_io *kaitai.Stream
	_root *TcpSegment
	_parent interface{}
}
func NewTcpSegment() *TcpSegment {
	return &TcpSegment{
	}
}

func (this *TcpSegment) Read(io *kaitai.Stream, parent interface{}, root *TcpSegment) (err error) {
	this._io = io
	this._parent = parent
	this._root = root

	tmp1, err := this._io.ReadU2be()
	if err != nil {
		return err
	}
	this.SrcPort = uint16(tmp1)
	tmp2, err := this._io.ReadU2be()
	if err != nil {
		return err
	}
	this.DstPort = uint16(tmp2)
	tmp3, err := this._io.ReadU4be()
	if err != nil {
		return err
	}
	this.SeqNum = uint32(tmp3)
	tmp4, err := this._io.ReadU4be()
	if err != nil {
		return err
	}
	this.AckNum = uint32(tmp4)
	tmp5, err := this._io.ReadBitsIntBe(4)
	if err != nil {
		return err
	}
	this.DataOffset = tmp5
	tmp6, err := this._io.ReadBitsIntBe(4)
	if err != nil {
		return err
	}
	this.Reserved = tmp6
	this._io.AlignToByte()
	tmp7 := NewTcpSegment_Flags()
	err = tmp7.Read(this._io, this, this._root)
	if err != nil {
		return err
	}
	this.Flags = tmp7
	tmp8, err := this._io.ReadU2be()
	if err != nil {
		return err
	}
	this.WindowSize = uint16(tmp8)
	tmp9, err := this._io.ReadU2be()
	if err != nil {
		return err
	}
	this.Checksum = uint16(tmp9)
	tmp10, err := this._io.ReadU2be()
	if err != nil {
		return err
	}
	this.UrgentPointer = uint16(tmp10)
	if (((this.DataOffset * 4) - 20) != 0) {
		tmp11, err := this._io.ReadBytes(int(((this.DataOffset * 4) - 20)))
		if err != nil {
			return err
		}
		tmp11 = tmp11
		this.Options = tmp11
	}
	tmp12, err := this._io.ReadBytesFull()
	if err != nil {
		return err
	}
	tmp12 = tmp12
	this.Body = tmp12
	return err
}

/**
 * Source port
 */

/**
 * Destination port
 */

/**
 * Sequence number
 */

/**
 * Acknowledgment number
 */

/**
 * Data offset (in 32-bit words from the beginning of this type, normally 32 or can be extended if there are any TCP options or padding is present)
 */

/**
 * TCP header flags as defined "TCP Header Flags" registry.
 */
type TcpSegment_Flags struct {
	Cwr bool
	Ece bool
	Urg bool
	Ack bool
	Psh bool
	Rst bool
	Syn bool
	Fin bool
	_io *kaitai.Stream
	_root *TcpSegment
	_parent *TcpSegment
}
func NewTcpSegment_Flags() *TcpSegment_Flags {
	return &TcpSegment_Flags{
	}
}

func (this *TcpSegment_Flags) Read(io *kaitai.Stream, parent *TcpSegment, root *TcpSegment) (err error) {
	this._io = io
	this._parent = parent
	this._root = root

	tmp13, err := this._io.ReadBitsIntBe(1)
	if err != nil {
		return err
	}
	this.Cwr = tmp13 != 0
	tmp14, err := this._io.ReadBitsIntBe(1)
	if err != nil {
		return err
	}
	this.Ece = tmp14 != 0
	tmp15, err := this._io.ReadBitsIntBe(1)
	if err != nil {
		return err
	}
	this.Urg = tmp15 != 0
	tmp16, err := this._io.ReadBitsIntBe(1)
	if err != nil {
		return err
	}
	this.Ack = tmp16 != 0
	tmp17, err := this._io.ReadBitsIntBe(1)
	if err != nil {
		return err
	}
	this.Psh = tmp17 != 0
	tmp18, err := this._io.ReadBitsIntBe(1)
	if err != nil {
		return err
	}
	this.Rst = tmp18 != 0
	tmp19, err := this._io.ReadBitsIntBe(1)
	if err != nil {
		return err
	}
	this.Syn = tmp19 != 0
	tmp20, err := this._io.ReadBitsIntBe(1)
	if err != nil {
		return err
	}
	this.Fin = tmp20 != 0
	return err
}

/**
 * Congestion Window Reduced
 */

/**
 * ECN-Echo
 */

/**
 * Urgent pointer field is significant
 */

/**
 * Acknowledgment field is significant
 */

/**
 * Push function
 */

/**
 * Reset the connection
 */

/**
 * Synchronize sequence numbers
 */

/**
 * No more data from sender
 */