Device: Add GetComponentVersions and GetSupportedFeatures commands

Driver: Fix re-open and failed open cases for TCP

Also enforces even length packets for the RED2, FIRE3, and FIRE3 FlexRay devices.

communication/packet/componentversionpacket.cpp

@@ -0,0 +1,45 @@
+#include "icsneo/communication/packet/componentversionpacket.h"
+#include "icsneo/communication/message/componentversionsmessage.h"
+
+using namespace icsneo;
+
+#pragma pack(push, 2)
+struct PackedComponentVersion {
+	uint8_t valid;
+	uint8_t expansionSlot;
+	uint8_t componentInfo; // Component specific data (e.g. Linux: boot device)
+	uint8_t reserved;
+	uint32_t identifier;
+	uint32_t dotVersion; // Represents a.b.c.d, a.b.c, or a.b, depending on leading zeros.
+	uint32_t commitHash;
+};
+
+static constexpr size_t MaxReportedVersions = 16;
+struct ComponentVersionsResponse {
+	ExtendedResponseMessage::ResponseHeader header;
+	uint16_t numVersions;
+	PackedComponentVersion versions[MaxReportedVersions];
+};
+#pragma pack(pop)
+
+std::shared_ptr<ComponentVersionsMessage> ComponentVersionPacket::DecodeToMessage(const std::vector<uint8_t>& bytes) {
+	auto msg = std::make_shared<ComponentVersionsMessage>();
+	// Length checks: At least a header and numVersions field.
+	if(bytes.size() < sizeof(ExtendedResponseMessage::ResponseHeader) + 2) {
+		return msg; // Empty
+	}
+	// Get a reference to the payload to fully validate the length
+	const auto& response = *reinterpret_cast<const ComponentVersionsResponse*>(bytes.data());
+	// Expected size is the header, numVersions field, and numVersions ComponentVersion objects.
+	auto expectedSize = sizeof(ExtendedResponseMessage::ResponseHeader) + 2 + (response.numVersions * sizeof(ComponentVersion));
+	// If the response is malformed (too small), return an empty message.
+	if(bytes.size() < expectedSize) {
+		return msg; // Empty
+	}
+	// Unpack into the portable class
+	for(unsigned int i = 0; i < response.numVersions; ++i) {
+		const auto& packedVersion = response.versions[i];
+		msg->versions.emplace_back(packedVersion.valid, packedVersion.componentInfo, packedVersion.identifier, packedVersion.dotVersion, packedVersion.commitHash);
+	}
+	return msg;
+}