144 lines
3.6 KiB
Dart
144 lines
3.6 KiB
Dart
import 'dart:convert';
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import 'package:crc32_checksum/crc32_checksum.dart';
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import 'package:crypto/crypto.dart';
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import 'package:star_lock/app_settings/app_settings.dart';
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class ScpMessage {
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ScpMessage({
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this.ProtocolFlag,
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this.MessageType,
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this.MessageId,
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this.SpTotal,
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this.SpIndex,
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this.FromPeerId,
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this.ToPeerId,
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this.PayloadType,
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this.PayloadCRC,
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this.PayloadLength,
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this.Payload,
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});
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String? ProtocolFlag;
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int? MessageType;
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int? MessageId;
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int? SpTotal;
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int? SpIndex;
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String? FromPeerId;
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String? ToPeerId;
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int? PayloadType;
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int? PayloadCRC;
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int? PayloadLength;
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String? Payload;
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ScpMessage.fromJson(dynamic json) {
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ProtocolFlag = json['ProtocolFlag'];
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MessageType = json['MessageType'];
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MessageId = json['MessageId'];
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SpTotal = json['SpTotal'];
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SpIndex = json['SpIndex'];
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FromPeerId = json['FromPeerId'];
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ToPeerId = json['ToPeerId'];
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PayloadType = json['PayloadType'];
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PayloadCRC = json['PayloadCRC'];
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PayloadLength = json['PayloadLength'];
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Payload = json['Payload'];
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}
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Map<String, dynamic> toJson() {
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return {
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'ProtocolFlag': ProtocolFlag,
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'MessageType': MessageType,
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'MessageId': MessageId,
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'SpTotal': SpTotal,
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'SpIndex': SpIndex,
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'FromPeerId': FromPeerId,
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'ToPeerId': ToPeerId,
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'PayloadType': PayloadType,
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'PayloadCRC': PayloadCRC,
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'PayloadLength': PayloadLength,
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'Payload': Payload,
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};
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}
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String serialize() {
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final bytes = <int>[];
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// ProtocolFlag (4 bytes)
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if (ProtocolFlag != null) {
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bytes.addAll(utf8.encode(ProtocolFlag!));
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}
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// MessageType (1 byte)
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if (MessageType != null) {
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bytes.add(MessageType!);
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}
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// MessageId (2 bytes)
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if (MessageId != null) {
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final highByteMessageId = (MessageId! >> 8) & 0xFF;
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final lowByteMessageId = MessageId! & 0xFF;
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bytes.add(lowByteMessageId); // 交换位置
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bytes.add(highByteMessageId); // 交换位置
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}
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// SpTotal (1 byte)
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if (SpTotal != null) {
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bytes.add(SpTotal!);
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}
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// SpIndex (1 byte)
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if (SpIndex != null) {
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bytes.add(SpIndex!);
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}
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// FromPeerId (字符串，记录长度)
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if (FromPeerId != null) {
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bytes.addAll(utf8.encode(FromPeerId!));
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}
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// ToPeerId (字符串，假设长度固定为32字节)
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if (ToPeerId != null) {
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bytes.addAll(utf8.encode(ToPeerId!));
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}
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// PayloadType (2 bytes)
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if (PayloadType != null) {
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final highBytePayloadType = (PayloadType! >> 8) & 0xFF;
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final lowBytePayloadType = PayloadType! & 0xFF;
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bytes.add(lowBytePayloadType); // 交换位置
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bytes.add(highBytePayloadType); // 交换位置
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}
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// 计算 PayloadCRC (2 bytes)
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if (PayloadCRC != null) {
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final highBytePayloadCRC = (PayloadCRC! >> 8) & 0xFF;
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final lowBytePayloadCRC = PayloadCRC! & 0xFF;
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bytes.add(lowBytePayloadCRC); // 交换位置
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bytes.add(highBytePayloadCRC); // 交换位置
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}
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// PayloadLength (4 bytes)
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if (PayloadLength != null) {
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bytes.add(PayloadLength! & 0xFF);
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bytes.add((PayloadLength! >> 8) & 0xFF);
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bytes.add((PayloadLength! >> 16) & 0xFF);
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bytes.add((PayloadLength! >> 24) & 0xFF);
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}
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// Payload (字符串，转换为字节)
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if (Payload != null) {
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bytes.addAll(utf8.encode(Payload!));
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}
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// 转16进制字符串
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final bytesToHexString = bytesToHex(bytes);
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return bytesToHexString;
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}
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static String bytesToHex(List<int> bytes) {
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return bytes.map((byte) => byte.toRadixString(16).padLeft(2, '0')).join('');
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}
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}
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