1 files changed, 41 insertions, 0 deletions
diff --git a/launcher/testdata/test/ModifiedUtf8Encoder.java b/launcher/testdata/test/ModifiedUtf8Encoder.java
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+++ b/launcher/testdata/test/ModifiedUtf8Encoder.java
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+// Copyright 2021 Code Intelligence GmbH
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package test;
+
+import java.nio.charset.Charset;
+import java.util.ArrayList;
+
+final class ModifiedUtf8Encoder {
+  // Encodes a string in the JVM's modified UTF-8 encoding.
+  static public byte[] encode(String value) {
+    // Modified UTF-8 is almost the same as CESU-8, the only difference being that the zero
+    // character is coded on two bytes.
+    byte[] cesuBytes = value.getBytes(Charset.forName("CESU-8"));
+    ArrayList<Byte> modifiedUtf8Bytes = new ArrayList<>();
+    for (byte cesuByte : cesuBytes) {
+      if (cesuByte != 0) {
+        modifiedUtf8Bytes.add(cesuByte);
+      } else {
+        modifiedUtf8Bytes.add((byte) 0xC0);
+        modifiedUtf8Bytes.add((byte) 0x80);
+      }
+    }
+    byte[] out = new byte[modifiedUtf8Bytes.size()];
+    for (int i = 0; i < modifiedUtf8Bytes.size(); i++) {
+      out[i] = modifiedUtf8Bytes.get(i);
+    }
+    return out;
+  }
+}