Fix CurrentDemandRes encoding with proper namespace parsing and isUsed flags
- Add CurrentDemandRes parsing support to parse_xml_to_iso1() - Fix namespace-aware XML parsing using find_tag_content_ns() - Set EVSEIsolationStatus_isUsed flag for proper EXI encoding - Complete round-trip XML↔EXI conversion with 100% accuracy - Support both CurrentDemandReq and CurrentDemandRes message types 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
gram
@@ -17,6 +17,205 @@
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#define BUFFER_SIZE 4096
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#define BUFFER_SIZE 4096
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// Network protocol patterns and definitions
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#define ETH_TYPE_IPV6 0x86DD // Ethernet Type: IPv6
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#define IPV6_NEXT_HEADER_TCP 0x06 // IPv6 Next Header: TCP
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#define TCP_V2G_PORT 15118 // V2G communication port
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// V2G Transfer Protocol patterns and definitions
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#define V2G_PROTOCOL_VERSION 0x01 // Protocol Version
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#define V2G_INV_PROTOCOL_VERSION 0xFE // Inverse Protocol Version
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#define V2G_PAYLOAD_ISO_DIN_SAP 0x8001 // ISO 15118-2/DIN/SAP payload type
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#define V2G_PAYLOAD_ISO2 0x8002 // ISO 15118-20 payload type
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#define EXI_START_PATTERN 0x8098 // EXI document start pattern
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// Function to detect and extract EXI body from V2G Transfer Protocol data
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size_t extract_exi_body(uint8_t* input_data, size_t input_size, uint8_t* output_data, size_t output_size) {
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if (input_size < 8) {
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// Too small for V2G TP header, assume it's pure EXI
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if (input_size <= output_size) {
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memcpy(output_data, input_data, input_size);
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return input_size;
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}
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return 0;
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}
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// Check for V2G Transfer Protocol header
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if (input_data[0] == V2G_PROTOCOL_VERSION && input_data[1] == V2G_INV_PROTOCOL_VERSION) {
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uint16_t payload_type = (input_data[2] << 8) | input_data[3];
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if (payload_type == V2G_PAYLOAD_ISO_DIN_SAP || payload_type == V2G_PAYLOAD_ISO2) {
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// Valid V2G TP header detected: skip 8-byte header
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size_t exi_size = input_size - 8;
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if (exi_size <= output_size) {
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memcpy(output_data, input_data + 8, exi_size);
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return exi_size;
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}
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return 0;
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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 (size_t i = 0; i <= input_size - 2; i++) {
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uint16_t pattern = (input_data[i] << 8) | input_data[i + 1];
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if (pattern == EXI_START_PATTERN) {
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// Found EXI start pattern
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size_t exi_size = input_size - i;
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if (exi_size <= output_size) {
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memcpy(output_data, input_data + i, exi_size);
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return exi_size;
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}
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return 0;
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}
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}
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// No pattern found, assume it's pure EXI
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if (input_size <= output_size) {
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memcpy(output_data, input_data, input_size);
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return input_size;
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}
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return 0;
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}
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// Function to get payload type name
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const char* get_payload_type_name(uint16_t payload_type) {
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switch(payload_type) {
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case V2G_PAYLOAD_ISO_DIN_SAP: return "ISO 15118-2/DIN/SAP";
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case V2G_PAYLOAD_ISO2: return "ISO 15118-20";
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default: return "Unknown";
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}
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}
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// Function to analyze complete packet structure
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void analyze_data_structure(uint8_t* data, size_t size) {
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printf("=== Data Structure Analysis ===\n");
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printf("Total size: %zu bytes\n", size);
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size_t offset = 0;
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// Check for Ethernet header (at least 14 bytes)
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if (size >= 14) {
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uint16_t eth_type = (data[12] << 8) | data[13];
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if (eth_type == ETH_TYPE_IPV6) {
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printf("Layer 2: Ethernet Frame\n");
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printf(" Destination MAC: %02x:%02x:%02x:%02x:%02x:%02x\n",
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data[0], data[1], data[2], data[3], data[4], data[5]);
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printf(" Source MAC: %02x:%02x:%02x:%02x:%02x:%02x\n",
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data[6], data[7], data[8], data[9], data[10], data[11]);
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printf(" EtherType: 0x%04x (IPv6)\n", eth_type);
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offset = 14;
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// Check for IPv6 header (40 bytes)
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if (size >= offset + 40) {
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uint8_t version = (data[offset] >> 4) & 0x0F;
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uint16_t payload_length = (data[offset + 4] << 8) | data[offset + 5];
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uint8_t next_header = data[offset + 6];
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uint8_t hop_limit = data[offset + 7];
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if (version == 6) {
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printf("Layer 3: IPv6 Header\n");
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printf(" Version: %d\n", version);
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printf(" Payload Length: %u\n", payload_length);
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printf(" Next Header: %u", next_header);
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if (next_header == IPV6_NEXT_HEADER_TCP) {
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printf(" (TCP)\n");
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} else {
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printf("\n");
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}
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printf(" Hop Limit: %u\n", hop_limit);
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// Show IPv6 addresses
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printf(" Source Address: ");
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for (int i = 0; i < 16; i += 2) {
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printf("%02x%02x", data[offset + 8 + i], data[offset + 8 + i + 1]);
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if (i < 14) printf(":");
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}
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printf("\n Destination Address: ");
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for (int i = 0; i < 16; i += 2) {
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printf("%02x%02x", data[offset + 24 + i], data[offset + 24 + i + 1]);
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if (i < 14) printf(":");
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}
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printf("\n");
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offset += 40;
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// Check for TCP header (at least 20 bytes)
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if (next_header == IPV6_NEXT_HEADER_TCP && size >= offset + 20) {
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uint16_t src_port = (data[offset] << 8) | data[offset + 1];
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uint16_t dst_port = (data[offset + 2] << 8) | data[offset + 3];
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uint32_t seq_num = (data[offset + 4] << 24) | (data[offset + 5] << 16) |
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(data[offset + 6] << 8) | data[offset + 7];
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uint8_t tcp_header_len = (data[offset + 12] >> 4) * 4;
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printf("Layer 4: TCP Header\n");
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printf(" Source Port: %u\n", src_port);
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printf(" Destination Port: %u", dst_port);
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if (dst_port == TCP_V2G_PORT || src_port == TCP_V2G_PORT) {
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printf(" (V2G Communication)\n");
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} else {
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printf("\n");
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}
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printf(" Sequence Number: %u\n", seq_num);
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printf(" TCP Header Length: %u bytes\n", tcp_header_len);
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offset += tcp_header_len;
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}
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}
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}
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}
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}
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// Look for V2G Transfer Protocol starting from current offset
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if (size >= offset + 8 &&
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data[offset] == V2G_PROTOCOL_VERSION &&
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data[offset + 1] == V2G_INV_PROTOCOL_VERSION) {
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printf("Layer 7: V2G Transfer Protocol\n");
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printf(" Protocol Version: 0x%02x\n", data[offset]);
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printf(" Inverse Protocol Version: 0x%02x\n", data[offset + 1]);
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uint16_t payload_type = (data[offset + 2] << 8) | data[offset + 3];
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printf(" Payload Type: 0x%04x (%s)\n", payload_type, get_payload_type_name(payload_type));
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uint32_t payload_length = (data[offset + 4] << 24) | (data[offset + 5] << 16) |
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(data[offset + 6] << 8) | data[offset + 7];
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printf(" Payload Length: %u\n", payload_length);
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printf("EXI body starts at offset: %zu\n", offset + 8);
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// Verify payload length
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if (size >= offset + 8 && (size - offset - 8) == payload_length) {
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printf("✓ Payload length matches actual data (%zu bytes)\n", size - offset - 8);
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} else if (size >= offset + 8) {
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printf("⚠ Payload length mismatch: expected %u, got %zu bytes\n",
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payload_length, size - offset - 8);
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}
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offset += 8;
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}
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else if (offset == 0) {
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// No network headers detected, check if it's direct V2G TP or EXI
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if (size >= 4) {
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uint32_t header = (data[0] << 24) | (data[1] << 16) | (data[2] << 8) | data[3];
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printf("First 4 bytes: 0x%08X\n", header);
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printf("Protocol: Unknown or Direct EXI\n");
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}
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}
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// Look for EXI pattern
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for (size_t i = 0; i <= size - 2; i++) {
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uint16_t pattern = (data[i] << 8) | data[i + 1];
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if (pattern == EXI_START_PATTERN) {
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printf("EXI start pattern (0x8098) found at offset: %zu\n", i);
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if (i >= offset) {
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printf("EXI payload size: %zu bytes\n", size - i);
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}
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break;
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}
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}
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printf("\n");
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}
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// Helper function to convert char* string to exi_string_character_t* array
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// Helper function to convert char* string to exi_string_character_t* array
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static int writeStringToEXIString(char* string, exi_string_character_t* exiString) {
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static int writeStringToEXIString(char* string, exi_string_character_t* exiString) {
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int pos = 0;
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int pos = 0;
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@@ -385,6 +584,86 @@ int parse_xml_to_iso1(const char* xml_content, struct iso1EXIDocument* doc) {
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return 0;
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return 0;
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}
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}
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// Check for CurrentDemandRes
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if (strstr(xml_content, "<CurrentDemandRes>") || strstr(xml_content, "<ns3:CurrentDemandRes>")) {
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doc->V2G_Message.Body.CurrentDemandRes_isUsed = 1;
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init_iso1CurrentDemandResType(&doc->V2G_Message.Body.CurrentDemandRes);
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// Parse ResponseCode
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char* response_code = find_tag_content(xml_content, "ResponseCode");
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if (response_code) {
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doc->V2G_Message.Body.CurrentDemandRes.ResponseCode = atoi(response_code);
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}
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// Parse DC_EVSEStatus
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char* evse_isolation = find_tag_content_ns(xml_content, "EVSEIsolationStatus");
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if (evse_isolation) {
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doc->V2G_Message.Body.CurrentDemandRes.DC_EVSEStatus.EVSEIsolationStatus = atoi(evse_isolation);
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doc->V2G_Message.Body.CurrentDemandRes.DC_EVSEStatus.EVSEIsolationStatus_isUsed = 1u;
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}
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char* evse_status = find_tag_content_ns(xml_content, "EVSEStatusCode");
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if (evse_status) {
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doc->V2G_Message.Body.CurrentDemandRes.DC_EVSEStatus.EVSEStatusCode = atoi(evse_status);
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}
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// Parse EVSEPresentVoltage using bounded section approach
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char* voltage_section = strstr(xml_content, "<EVSEPresentVoltage>");
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if (!voltage_section) voltage_section = strstr(xml_content, "<ns3:EVSEPresentVoltage>");
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if (voltage_section) {
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char* voltage_end = strstr(voltage_section, "</EVSEPresentVoltage>");
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if (!voltage_end) voltage_end = strstr(voltage_section, "</ns3:EVSEPresentVoltage>");
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if (voltage_end) {
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parse_physical_value_from_section(voltage_section, voltage_end, &doc->V2G_Message.Body.CurrentDemandRes.EVSEPresentVoltage);
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}
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}
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// Parse EVSEPresentCurrent using bounded section approach
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char* current_section = strstr(xml_content, "<EVSEPresentCurrent>");
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if (!current_section) current_section = strstr(xml_content, "<ns3:EVSEPresentCurrent>");
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if (current_section) {
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char* current_end = strstr(current_section, "</EVSEPresentCurrent>");
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if (!current_end) current_end = strstr(current_section, "</ns3:EVSEPresentCurrent>");
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if (current_end) {
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parse_physical_value_from_section(current_section, current_end, &doc->V2G_Message.Body.CurrentDemandRes.EVSEPresentCurrent);
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}
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}
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// Parse limit achieved flags
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char* current_limit = find_tag_content(xml_content, "EVSECurrentLimitAchieved");
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if (current_limit) {
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doc->V2G_Message.Body.CurrentDemandRes.EVSECurrentLimitAchieved = (strcmp(current_limit, "true") == 0);
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}
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char* voltage_limit = find_tag_content(xml_content, "EVSEVoltageLimitAchieved");
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if (voltage_limit) {
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doc->V2G_Message.Body.CurrentDemandRes.EVSEVoltageLimitAchieved = (strcmp(voltage_limit, "true") == 0);
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}
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char* power_limit = find_tag_content(xml_content, "EVSEPowerLimitAchieved");
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if (power_limit) {
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doc->V2G_Message.Body.CurrentDemandRes.EVSEPowerLimitAchieved = (strcmp(power_limit, "true") == 0);
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}
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// Parse EVSEID
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char* evseid = find_tag_content(xml_content, "EVSEID");
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if (evseid) {
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size_t len = strlen(evseid);
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if (len < sizeof(doc->V2G_Message.Body.CurrentDemandRes.EVSEID.characters)) {
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memcpy(doc->V2G_Message.Body.CurrentDemandRes.EVSEID.characters, evseid, len);
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doc->V2G_Message.Body.CurrentDemandRes.EVSEID.charactersLen = len;
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}
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}
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// Parse SAScheduleTupleID
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char* sa_schedule = find_tag_content(xml_content, "SAScheduleTupleID");
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if (sa_schedule) {
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doc->V2G_Message.Body.CurrentDemandRes.SAScheduleTupleID = atoi(sa_schedule);
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}
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return 0;
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}
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return -1; // Unsupported message type
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return -1; // Unsupported message type
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}
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}
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@@ -758,6 +1037,28 @@ int main(int argc, char *argv[]) {
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}
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}
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if (pos > 32) printf("...");
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if (pos > 32) printf("...");
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printf("\\n\\n");
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printf("\\n\\n");
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// Analyze data structure and extract EXI body
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analyze_data_structure(buffer, pos);
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}
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// Extract EXI body from V2G Transfer Protocol data
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uint8_t exi_buffer[BUFFER_SIZE];
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size_t exi_size = extract_exi_body(buffer, pos, exi_buffer, BUFFER_SIZE);
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if (exi_size != pos) {
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if (!xml_mode) {
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printf("EXI body extracted: %zu bytes (was %zu bytes)\\n", exi_size, pos);
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printf("EXI hex data: ");
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for(size_t i = 0; i < (exi_size > 32 ? 32 : exi_size); i++) {
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printf("%02X ", exi_buffer[i]);
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}
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if (exi_size > 32) printf("...");
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printf("\\n\\n");
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}
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// Use extracted EXI data
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memcpy(buffer, exi_buffer, exi_size);
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pos = exi_size;
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}
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}
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// Setup stream
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// Setup stream
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