Connect minimal hosts to snapshots, target workers and shared Kit editing

2026-11-12 11:07:45 +01:00
parent 28c1e47c95
commit 7db7218a6e
52 changed files with 4236 additions and 29 deletions
@@ -0,0 +1,42 @@
+package de.neitzel.fxdesigner.protocol;
+
+import java.io.*;
+import java.nio.charset.StandardCharsets;
+import java.util.*;
+
+/**
+ * Metadata payload format 1. Properties escaping preserves arbitrary labels without class loading.
+ */
+public final class PreviewMessages {
+  private PreviewMessages() {}
+
+  public static byte[] encode(Map<String, String> values) throws IOException {
+    var p = new Properties();
+    p.putAll(values);
+    var w = new StringWriter();
+    p.store(w, null);
+    byte[] bytes = w.toString().getBytes(StandardCharsets.UTF_8);
+    if (bytes.length > WireProtocol.MAX_METADATA) throw new IOException("Metadata too large");
+    return bytes;
+  }
+
+  public static Map<String, String> decode(byte[] bytes) throws IOException {
+    if (bytes.length > WireProtocol.MAX_METADATA) throw new IOException("Metadata too large");
+    var p =
+        new Properties() {
+          public synchronized Object put(Object k, Object v) {
+            if (containsKey(k)) throw new IllegalArgumentException("Duplicate metadata key");
+            return super.put(k, v);
+          }
+        };
+    p.load(
+        new StringReader(
+            StandardCharsets.UTF_8
+                .newDecoder()
+                .decode(java.nio.ByteBuffer.wrap(bytes))
+                .toString()));
+    var result = new TreeMap<String, String>();
+    for (String k : p.stringPropertyNames()) result.put(k, p.getProperty(k));
+    return Map.copyOf(result);
+  }
+}