[hal] Add ErrorInfo support to systemcore DS (#7488)

hal/src/main/native/cpp/proto/ErrorInfoProto.cpp

@@ -0,0 +1,71 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#include <string>
+#include <utility>
+
+#include <wpi/protobuf/ProtobufCallbacks.h>
+
+#include "hal/proto/ErrorInfo.h"
+
+std::optional<mrc::ErrorInfo> wpi::Protobuf<mrc::ErrorInfo>::Unpack(
+    InputStream& Stream) {
+  wpi::UnpackCallback<std::string> DetailsCb;
+  wpi::UnpackCallback<std::string> LocationCb;
+  wpi::UnpackCallback<std::string> CallStackCb;
+
+  mrc_proto_ProtobufErrorInfo Msg{
+      .IsError = false,
+      .ErrorCode = 0,
+      .Details = DetailsCb.Callback(),
+      .Location = LocationCb.Callback(),
+      .CallStack = CallStackCb.Callback(),
+  };
+
+  if (!Stream.Decode(Msg)) {
+    return {};
+  }
+
+  auto Details = DetailsCb.Items();
+  auto Location = LocationCb.Items();
+  auto CallStack = CallStackCb.Items();
+
+  mrc::ErrorInfo ToRet;
+  ToRet.IsError = Msg.IsError;
+  ToRet.ErrorCode = Msg.ErrorCode;
+
+  if (!Details.empty()) {
+    ToRet.MoveDetails(std::move(Details[0]));
+  }
+
+  if (!Location.empty()) {
+    ToRet.MoveLocation(std::move(Location[0]));
+  }
+
+  if (!CallStack.empty()) {
+    ToRet.MoveCallStack(std::move(CallStack[0]));
+  }
+
+  return ToRet;
+}
+
+bool wpi::Protobuf<mrc::ErrorInfo>::Pack(OutputStream& Stream,
+                                         const mrc::ErrorInfo& Value) {
+  std::string_view DetailsView = Value.GetDetails();
+  std::string_view LocationView = Value.GetLocation();
+  std::string_view CallStackView = Value.GetCallStack();
+  wpi::PackCallback DetailsCb{&DetailsView};
+  wpi::PackCallback LocationCb{&LocationView};
+  wpi::PackCallback CallStackCb{&CallStackView};
+
+  mrc_proto_ProtobufErrorInfo Msg{
+      .IsError = Value.IsError,
+      .ErrorCode = Value.ErrorCode,
+      .Details = DetailsCb.Callback(),
+      .Location = LocationCb.Callback(),
+      .CallStack = CallStackCb.Callback(),
+  };
+
+  return Stream.Encode(Msg);
+}