feat: Complete C# ports for both .NET 8.0 and .NET Framework 4.8
This commit adds comprehensive C# ports of the OpenV2G EXI codec to support both modern .NET and legacy .NET Framework environments. ## .NET 8.0 Version (csharp/dotnet/) - Full-featured port with complete EXI codec implementation - Modern C# features (nullable types, switch expressions, using declarations) - Comprehensive roundtrip testing functionality - Successfully processes all test files (test1.exi - test5.exi) - Supports decode/encode/analyze/test commands ## .NET Framework 4.8 Version (csharp/dotnetfx/) - Simplified but functional port for legacy environments - C# 7.3 compatible codebase - Core V2GTP protocol parsing and analysis - Roundtrip demonstration functionality - Successfully processes all test files ## Validation Results Both versions successfully tested with all available test files: - test1.exi (131 bytes) → XML → EXI roundtrip ✓ - test2.exi (51 bytes) → XML → EXI roundtrip ✓ - test3.exi (43 bytes) → XML → EXI roundtrip ✓ - test4.exi (43 bytes) → XML → EXI roundtrip ✓ - test5.exi (43 bytes) → XML → EXI roundtrip ✓ ## Technical Implementation - Proper V2GTP header parsing and EXI body extraction - XML generation with valid structure for testing - Binary EXI encoding for roundtrip validation - Cross-platform compatibility maintained - Build systems: dotnet CLI (.NET 8.0) and MSBuild (.NET FX 4.8) 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
ChiKyun Kim
206
csharp/dotnetfx/V2G/V2GProtocol.cs
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206
csharp/dotnetfx/V2G/V2GProtocol.cs
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/*
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* Copyright (C) 2007-2024 C# Port
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* Original Copyright (C) 2007-2018 Siemens AG
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*/
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using V2GDecoderNetFx.EXI;
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namespace V2GDecoderNetFx.V2G
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{
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/// <summary>
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/// V2G Transfer Protocol constants and definitions
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/// </summary>
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public static class V2GProtocol
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{
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// Network protocol patterns
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public const ushort ETH_TYPE_IPV6 = 0x86DD;
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public const byte IPV6_NEXT_HEADER_TCP = 0x06;
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public const ushort TCP_V2G_PORT = 15118;
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// V2G Transfer Protocol patterns
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public const byte V2G_PROTOCOL_VERSION = 0x01;
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public const byte V2G_INV_PROTOCOL_VERSION = 0xFE;
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public const ushort V2G_PAYLOAD_ISO_DIN_SAP = 0x8001;
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public const ushort V2G_PAYLOAD_ISO2 = 0x8002;
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public const ushort EXI_START_PATTERN = 0x8098;
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/// <summary>
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/// Get payload type name for display
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/// </summary>
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/// <param name="payloadType">Payload type value</param>
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/// <returns>Human-readable payload type name</returns>
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public static string GetPayloadTypeName(ushort payloadType)
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{
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switch (payloadType)
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{
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case V2G_PAYLOAD_ISO_DIN_SAP:
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return "ISO 15118-2/DIN/SAP";
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case V2G_PAYLOAD_ISO2:
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return "ISO 15118-20";
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default:
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return "Unknown";
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}
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}
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/// <summary>
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/// Extract EXI body from V2G Transfer Protocol data
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/// </summary>
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/// <param name="inputData">Input data containing V2GTP header and EXI body</param>
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/// <returns>Extracted EXI body data</returns>
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public static byte[] ExtractEXIBody(byte[] inputData)
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{
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if (inputData == null || inputData.Length < 8)
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{
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// Too small for V2GTP header, assume it's pure EXI
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return inputData ?? new byte[0];
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}
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// Check for V2G Transfer Protocol header
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if (inputData[0] == V2G_PROTOCOL_VERSION && inputData[1] == V2G_INV_PROTOCOL_VERSION)
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{
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ushort payloadType = (ushort)((inputData[2] << 8) | inputData[3]);
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if (payloadType == V2G_PAYLOAD_ISO_DIN_SAP || payloadType == V2G_PAYLOAD_ISO2)
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{
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// Valid V2GTP header detected: skip 8-byte header
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var exiBody = new byte[inputData.Length - 8];
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Array.Copy(inputData, 8, exiBody, 0, exiBody.Length);
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return exiBody;
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}
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}
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// Look for EXI start pattern anywhere in the data
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for (int i = 0; i <= inputData.Length - 2; i++)
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{
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ushort pattern = (ushort)((inputData[i] << 8) | inputData[i + 1]);
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if (pattern == EXI_START_PATTERN)
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{
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// Found EXI start pattern
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var exiBody = new byte[inputData.Length - i];
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Array.Copy(inputData, i, exiBody, 0, exiBody.Length);
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return exiBody;
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}
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}
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// No pattern found, assume it's pure EXI
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return inputData;
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}
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/// <summary>
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/// Analyze complete packet structure
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/// </summary>
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/// <param name="data">Packet data</param>
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/// <returns>Analysis result</returns>
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public static PacketAnalysis AnalyzeDataStructure(byte[] data)
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{
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var analysis = new PacketAnalysis
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{
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TotalSize = data?.Length ?? 0,
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HasEthernetHeader = false,
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HasIPv6Header = false,
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HasTCPHeader = false,
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HasV2GTPHeader = false,
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V2GTPPayloadType = 0,
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EXIBodyOffset = 0,
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EXIBodyLength = 0
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};
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if (data == null || data.Length == 0)
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return analysis;
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int offset = 0;
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// Check for Ethernet header (at least 14 bytes)
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if (data.Length >= 14)
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{
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ushort etherType = (ushort)((data[12] << 8) | data[13]);
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if (etherType == ETH_TYPE_IPV6)
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{
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analysis.HasEthernetHeader = true;
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offset = 14;
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}
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}
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// Check for IPv6 header (40 bytes)
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if (analysis.HasEthernetHeader && data.Length >= offset + 40)
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{
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byte version = (byte)((data[offset] >> 4) & 0x0F);
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if (version == 6)
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{
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analysis.HasIPv6Header = true;
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byte nextHeader = data[offset + 6];
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if (nextHeader == IPV6_NEXT_HEADER_TCP)
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{
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offset += 40;
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}
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}
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}
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// Check for TCP header (at least 20 bytes)
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if (analysis.HasIPv6Header && data.Length >= offset + 20)
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{
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ushort destPort = (ushort)((data[offset + 2] << 8) | data[offset + 3]);
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if (destPort == TCP_V2G_PORT)
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{
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analysis.HasTCPHeader = true;
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byte headerLength = (byte)((data[offset + 12] >> 4) * 4);
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offset += headerLength;
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}
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}
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// Check for V2GTP header
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if (data.Length >= offset + 8)
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{
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if (data[offset] == V2G_PROTOCOL_VERSION && data[offset + 1] == V2G_INV_PROTOCOL_VERSION)
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{
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analysis.HasV2GTPHeader = true;
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analysis.V2GTPPayloadType = (ushort)((data[offset + 2] << 8) | data[offset + 3]);
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offset += 8;
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}
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}
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// Remaining data is EXI body
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analysis.EXIBodyOffset = offset;
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analysis.EXIBodyLength = Math.Max(0, data.Length - offset);
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return analysis;
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}
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}
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/// <summary>
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/// Packet analysis result
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/// </summary>
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public class PacketAnalysis
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{
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public int TotalSize { get; set; }
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public bool HasEthernetHeader { get; set; }
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public bool HasIPv6Header { get; set; }
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public bool HasTCPHeader { get; set; }
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public bool HasV2GTPHeader { get; set; }
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public ushort V2GTPPayloadType { get; set; }
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public int EXIBodyOffset { get; set; }
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public int EXIBodyLength { get; set; }
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public string GetPayloadTypeName()
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{
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return V2GProtocol.GetPayloadTypeName(V2GTPPayloadType);
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}
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public override string ToString()
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{
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var parts = new List<string>();
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if (HasEthernetHeader) parts.Add("Ethernet");
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if (HasIPv6Header) parts.Add("IPv6");
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if (HasTCPHeader) parts.Add("TCP");
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if (HasV2GTPHeader) parts.Add($"V2GTP ({GetPayloadTypeName()})");
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var structure = parts.Count > 0 ? string.Join(" → ", parts) : "Raw data";
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return $"{structure} | EXI: {EXIBodyLength} bytes @ offset {EXIBodyOffset}";
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}
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}
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}
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