func Read()

in openpgp/packet/packet.go [355:420]
64 lines of code
21 McCabe index (conditional complexity)

func Read(r io.Reader) (p Packet, err error) {
	tag, _, contents, err := readHeader(r)
	if err != nil {
		return
	}

	switch tag {
	case packetTypeEncryptedKey:
		p = new(EncryptedKey)
	case packetTypeSignature:
		var version byte
		// Detect signature version
		if contents, version, err = peekVersion(contents); err != nil {
			return
		}
		if version < 4 {
			p = new(SignatureV3)
		} else {
			p = new(Signature)
		}
	case packetTypeSymmetricKeyEncrypted:
		p = new(SymmetricKeyEncrypted)
	case packetTypeOnePassSignature:
		p = new(OnePassSignature)
	case packetTypePrivateKey, packetTypePrivateSubkey:
		pk := new(PrivateKey)
		if tag == packetTypePrivateSubkey {
			pk.IsSubkey = true
		}
		p = pk
	case packetTypePublicKey, packetTypePublicSubkey:
		var version byte
		if contents, version, err = peekVersion(contents); err != nil {
			return
		}
		isSubkey := tag == packetTypePublicSubkey
		if version < 4 {
			p = &PublicKeyV3{IsSubkey: isSubkey}
		} else {
			p = &PublicKey{IsSubkey: isSubkey}
		}
	case packetTypeCompressed:
		p = new(Compressed)
	case packetTypeSymmetricallyEncrypted:
		p = new(SymmetricallyEncrypted)
	case packetTypeLiteralData:
		p = new(LiteralData)
	case packetTypeUserId:
		p = new(UserId)
	case packetTypeUserAttribute:
		p = new(UserAttribute)
	case packetTypeSymmetricallyEncryptedMDC:
		se := new(SymmetricallyEncrypted)
		se.MDC = true
		p = se
	default:
		err = errors.UnknownPacketTypeError(tag)
	}
	if p != nil {
		err = p.parse(contents)
	}
	if err != nil {
		consumeAll(contents)
	}
	return
}