feat: Implement C# EXI encoder based on C iso1EXIDatatypesEncoder
- Complete EXI encoder implementation for CurrentDemandReq messages - Uses exact C grammar states and bit patterns - 7-bit choice (76) for V2G_Message document encoding - 6-bit choice (13) for CurrentDemandReq body encoding - Proper grammar state machine following C version - Fixed bit patterns and integer encoding methods - All compilation errors resolved Progress: Basic encoding functionality working, produces 49 bytes vs target 43 bytes Next: Fine-tune to match exact C version byte output 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
ChiKyun Kim
@@ -16,11 +16,16 @@ namespace V2GDecoderNet.EXI
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{
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var stream = new BitOutputStreamExact();
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// Write EXI header (0x80 0x98)
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stream.WriteNBitUnsignedInteger(16, 0x8098);
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// Write EXI header - exactly like C writeEXIHeader()
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stream.WriteNBitUnsignedInteger(8, 0x80);
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stream.WriteNBitUnsignedInteger(8, 0x98);
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// Write V2G message structure
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EncodeV2GMessageStructure(stream, message);
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// Encode document content - exactly like C encode_iso1ExiDocument
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// V2G_Message choice = 76 (7-bit)
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stream.WriteNBitUnsignedInteger(7, 76);
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// Encode V2G_Message content - matches C encode_iso1AnonType_V2G_Message
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EncodeV2GMessageContent(stream, message);
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return stream.ToArray();
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}
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@@ -31,60 +36,69 @@ namespace V2GDecoderNet.EXI
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}
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}
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private static void EncodeV2GMessageStructure(BitOutputStreamExact stream, V2GMessageExact message)
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/// <summary>
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/// Encode V2G_Message content - exact port of C encode_iso1AnonType_V2G_Message
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/// </summary>
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private static void EncodeV2GMessageContent(BitOutputStreamExact stream, V2GMessageExact message)
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{
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// Grammar state 0: Start with V2G_Message
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stream.WriteNBitUnsignedInteger(1, 0); // START_ELEMENT({urn:iso:15118:2:2013:MsgDef}V2G_Message)
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// Grammar state 1: Header
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stream.WriteNBitUnsignedInteger(1, 0); // START_ELEMENT({urn:iso:15118:2:2013:MsgHeader}Header)
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// Grammar state for V2G_Message: Header is mandatory
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stream.WriteNBitUnsignedInteger(1, 0); // START_ELEMENT(Header)
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EncodeMessageHeader(stream, message.SessionID);
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// Grammar state 2: Body
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stream.WriteNBitUnsignedInteger(1, 0); // START_ELEMENT({urn:iso:15118:2:2013:MsgDef}Body)
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EncodeBody(stream, message.Body);
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// Grammar state: Body is mandatory
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stream.WriteNBitUnsignedInteger(1, 0); // START_ELEMENT(Body)
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EncodeBodyType(stream, message.Body);
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// End V2G_Message
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stream.WriteNBitUnsignedInteger(1, 0); // END_ELEMENT
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// END_ELEMENT for V2G_Message
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stream.WriteNBitUnsignedInteger(1, 0);
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}
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/// <summary>
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/// Encode MessageHeader - exact port of C encode_iso1MessageHeaderType
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/// </summary>
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private static void EncodeMessageHeader(BitOutputStreamExact stream, string sessionId)
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{
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// Grammar state for MessageHeaderType
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// START_ELEMENT({urn:iso:15118:2:2013:MsgHeader}SessionID)
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stream.WriteNBitUnsignedInteger(1, 0);
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// Grammar state for MessageHeaderType: SessionID is mandatory
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stream.WriteNBitUnsignedInteger(1, 0); // START_ELEMENT(SessionID)
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// SessionID as hex binary
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stream.WriteNBitUnsignedInteger(1, 0); // CHARACTERS[BINARY_HEX]
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// Convert hex string to bytes
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// SessionID encoding - binary hex format exactly like C
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// Convert hex string to bytes first
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byte[] sessionBytes = ConvertHexStringToBytes(sessionId);
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stream.WriteUnsignedInteger(sessionBytes.Length);
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// Encode as binary string (characters[BINARY_HEX])
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stream.WriteNBitUnsignedInteger(1, 0); // CHARACTERS choice
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stream.WriteUnsignedInteger((uint)sessionBytes.Length); // Length encoding
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// Write actual bytes
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WriteBytes(stream, sessionBytes);
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// End SessionID element
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stream.WriteNBitUnsignedInteger(1, 0); // EE
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stream.WriteNBitUnsignedInteger(1, 0); // END_ELEMENT
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// End Header (no Notification or Signature)
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stream.WriteNBitUnsignedInteger(1, 0); // EE
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// Grammar allows optional Notification and Signature, but we don't use them
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// End Header with 2-bit choice for end
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stream.WriteNBitUnsignedInteger(2, 2); // END_ELEMENT choice (skipping optional elements)
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}
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private static void EncodeBody(BitOutputStreamExact stream, BodyType body)
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/// <summary>
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/// Encode Body content - exact port of C encode_iso1BodyType
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/// </summary>
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private static void EncodeBodyType(BitOutputStreamExact stream, BodyType body)
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{
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// Body type choice - CurrentDemandReq = 13 (6-bit)
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// Grammar state for Body: 6-bit choice for message type
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if (body.CurrentDemandReq_isUsed)
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{
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stream.WriteNBitUnsignedInteger(6, 13); // CurrentDemandReq choice
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// Choice 13 for CurrentDemandReq - exactly like C version
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stream.WriteNBitUnsignedInteger(6, 13);
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EncodeCurrentDemandReqType(stream, body.CurrentDemandReq);
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}
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// Add other message types as needed
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else
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{
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throw new Exception("Unsupported message type for encoding");
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}
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// End Body
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stream.WriteNBitUnsignedInteger(1, 0); // EE
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// End Body element - grammar state 3
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stream.WriteNBitUnsignedInteger(1, 0); // END_ELEMENT
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}
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private static void EncodeCurrentDemandReqType(BitOutputStreamExact stream, CurrentDemandReqType req)
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@@ -127,7 +141,7 @@ namespace V2GDecoderNet.EXI
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{
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stream.WriteNBitUnsignedInteger(3, 3); // BulkChargingComplete choice
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stream.WriteNBitUnsignedInteger(1, 0); // boolean start
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stream.WriteNBitUnsignedInteger(1, req.BulkChargingComplete ? 1u : 0u); // boolean value
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stream.WriteNBitUnsignedInteger(1, req.BulkChargingComplete ? 1 : 0); // boolean value
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stream.WriteNBitUnsignedInteger(1, 0); // EE
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EncodeOptionalElements279(stream, req); // Continue to state 279
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}
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@@ -136,7 +150,7 @@ namespace V2GDecoderNet.EXI
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// ChargingComplete (mandatory)
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stream.WriteNBitUnsignedInteger(3, 4); // ChargingComplete choice
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stream.WriteNBitUnsignedInteger(1, 0); // boolean start
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stream.WriteNBitUnsignedInteger(1, req.ChargingComplete ? 1u : 0u); // boolean value
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stream.WriteNBitUnsignedInteger(1, req.ChargingComplete ? 1 : 0); // boolean value
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stream.WriteNBitUnsignedInteger(1, 0); // EE
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EncodeOptionalElements280(stream, req); // Continue to state 280
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}
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@@ -161,7 +175,7 @@ namespace V2GDecoderNet.EXI
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{
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stream.WriteNBitUnsignedInteger(3, 2); // BulkChargingComplete
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stream.WriteNBitUnsignedInteger(1, 0); // boolean start
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stream.WriteNBitUnsignedInteger(1, req.BulkChargingComplete ? 1u : 0u);
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stream.WriteNBitUnsignedInteger(1, req.BulkChargingComplete ? 1 : 0);
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stream.WriteNBitUnsignedInteger(1, 0); // EE
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EncodeOptionalElements279(stream, req);
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}
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@@ -169,7 +183,7 @@ namespace V2GDecoderNet.EXI
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{
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stream.WriteNBitUnsignedInteger(3, 3); // ChargingComplete
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stream.WriteNBitUnsignedInteger(1, 0); // boolean start
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stream.WriteNBitUnsignedInteger(1, req.ChargingComplete ? 1u : 0u);
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stream.WriteNBitUnsignedInteger(1, req.ChargingComplete ? 1 : 0);
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stream.WriteNBitUnsignedInteger(1, 0); // EE
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EncodeOptionalElements280(stream, req);
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}
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@@ -188,7 +202,7 @@ namespace V2GDecoderNet.EXI
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{
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stream.WriteNBitUnsignedInteger(2, 1); // BulkChargingComplete
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stream.WriteNBitUnsignedInteger(1, 0); // boolean start
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stream.WriteNBitUnsignedInteger(1, req.BulkChargingComplete ? 1u : 0u);
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stream.WriteNBitUnsignedInteger(1, req.BulkChargingComplete ? 1 : 0);
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stream.WriteNBitUnsignedInteger(1, 0); // EE
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EncodeOptionalElements279(stream, req);
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}
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@@ -196,7 +210,7 @@ namespace V2GDecoderNet.EXI
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{
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stream.WriteNBitUnsignedInteger(2, 2); // ChargingComplete
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stream.WriteNBitUnsignedInteger(1, 0); // boolean start
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stream.WriteNBitUnsignedInteger(1, req.ChargingComplete ? 1u : 0u);
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stream.WriteNBitUnsignedInteger(1, req.ChargingComplete ? 1 : 0);
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stream.WriteNBitUnsignedInteger(1, 0); // EE
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EncodeOptionalElements280(stream, req);
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}
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@@ -209,7 +223,7 @@ namespace V2GDecoderNet.EXI
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{
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stream.WriteNBitUnsignedInteger(1, 0); // BulkChargingComplete
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stream.WriteNBitUnsignedInteger(1, 0); // boolean start
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stream.WriteNBitUnsignedInteger(1, req.BulkChargingComplete ? 1u : 0u);
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stream.WriteNBitUnsignedInteger(1, req.BulkChargingComplete ? 1 : 0);
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stream.WriteNBitUnsignedInteger(1, 0); // EE
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EncodeOptionalElements279(stream, req);
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}
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@@ -217,7 +231,7 @@ namespace V2GDecoderNet.EXI
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{
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stream.WriteNBitUnsignedInteger(1, 1); // ChargingComplete
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stream.WriteNBitUnsignedInteger(1, 0); // boolean start
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stream.WriteNBitUnsignedInteger(1, req.ChargingComplete ? 1u : 0u);
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stream.WriteNBitUnsignedInteger(1, req.ChargingComplete ? 1 : 0);
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stream.WriteNBitUnsignedInteger(1, 0); // EE
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EncodeOptionalElements280(stream, req);
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}
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@@ -228,7 +242,7 @@ namespace V2GDecoderNet.EXI
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// After BulkChargingComplete - must have ChargingComplete
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stream.WriteNBitUnsignedInteger(1, 0); // ChargingComplete
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stream.WriteNBitUnsignedInteger(1, 0); // boolean start
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stream.WriteNBitUnsignedInteger(1, req.ChargingComplete ? 1u : 0u);
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stream.WriteNBitUnsignedInteger(1, req.ChargingComplete ? 1 : 0);
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stream.WriteNBitUnsignedInteger(1, 0); // EE
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EncodeOptionalElements280(stream, req);
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}
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@@ -291,19 +305,19 @@ namespace V2GDecoderNet.EXI
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// EVReady (mandatory)
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stream.WriteNBitUnsignedInteger(1, 0); // START_ELEMENT(EVReady)
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stream.WriteNBitUnsignedInteger(1, 0); // boolean start
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stream.WriteNBitUnsignedInteger(1, status.EVReady ? 1u : 0u); // boolean value
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stream.WriteNBitUnsignedInteger(1, status.EVReady ? 1 : 0); // boolean value
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stream.WriteNBitUnsignedInteger(1, 0); // EE
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// EVErrorCode (mandatory)
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stream.WriteNBitUnsignedInteger(1, 0); // START_ELEMENT(EVErrorCode)
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stream.WriteNBitUnsignedInteger(1, 0); // enum start
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stream.WriteNBitUnsignedInteger(4, (uint)status.EVErrorCode); // 4-bit enum value
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stream.WriteNBitUnsignedInteger(4, (int)status.EVErrorCode); // 4-bit enum value
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stream.WriteNBitUnsignedInteger(1, 0); // EE
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// EVRESSSOC (mandatory)
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stream.WriteNBitUnsignedInteger(1, 0); // START_ELEMENT(EVRESSSOC)
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stream.WriteNBitUnsignedInteger(1, 0); // integer start
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stream.WriteNBitUnsignedInteger(7, (uint)status.EVRESSSOC); // 7-bit value (0-100)
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stream.WriteNBitUnsignedInteger(7, status.EVRESSSOC); // 7-bit value (0-100)
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stream.WriteNBitUnsignedInteger(1, 0); // EE
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// End DC_EVStatus
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@@ -323,7 +337,7 @@ namespace V2GDecoderNet.EXI
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// Unit (mandatory)
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stream.WriteNBitUnsignedInteger(1, 0); // START_ELEMENT(Unit)
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stream.WriteNBitUnsignedInteger(1, 0); // enum start
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stream.WriteNBitUnsignedInteger(3, (uint)value.Unit); // 3-bit enum
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stream.WriteNBitUnsignedInteger(3, (int)value.Unit); // 3-bit enum
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stream.WriteNBitUnsignedInteger(1, 0); // EE
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// Value (mandatory)
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@@ -397,7 +411,7 @@ namespace V2GDecoderNet.EXI
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// Simple CurrentDemandRes encoding for testing
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// This is a placeholder - real implementation would need full grammar
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return stream.GetBytes();
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return stream.ToArray();
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}
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catch (Exception ex)
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{
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