more followFars

compiler/src/main/cpp/capnpc-java.c++

@@ -1251,6 +1251,9 @@ private:
                    structNode.getDiscriminantOffset(), ")];\n",
                    spaces(indent), "  }\n")
        : kj::strTree()),
+      spaces(indent), "  public final Reader asReader() {\n",
+      spaces(indent), "    return new Reader(this._builder.asReader());\n",
+      spaces(indent), "  }\n",
       kj::mv(methodDecls),
       spaces(indent), "}\n",
       "\n");

runtime/src/main/java/org/capnproto/WireHelpers.java

@@ -112,7 +112,26 @@ final class WireHelpers {
         //# so there are no FAR pointers.
         if (segment != null && WirePointer.kind(ref) == WirePointer.FAR) {
 
+            SegmentReader resultSegment = segment.arena.tryGetSegment(FarPointer.getSegmentId(ref));
+
+            int ptr = FarPointer.positionInSegment(ref);
+
+            int padWords = FarPointer.isDoubleFar(ref) ? 2 : 1;
+            // TODO read limiting
+
+            int pad = ptr;
+
+            if (!FarPointer.isDoubleFar(ref)) {
+
+                return new FollowFarsResult(WirePointer.target(pad,
+                                                               WirePointer.get(resultSegment.buffer, pad)),
+                                            pad, resultSegment);
+            } else {
+                //# Landing pad is another far pointer. It is
+                //# followed by a tag describing the pointed-to
+                //# object.
                 throw new Error("unimplemented");
+            }
 
         } else {
             return new FollowFarsResult(refTarget, ref, segment);