add ByteBufferBackedInputStream

serde-support/src/main/java/io/micronaut/serde/support/serdes/ByteBufferBackedInputStream.java

@@ -0,0 +1,44 @@
+/*
+ * Copyright 2017-2023 original authors
+ *
+ * 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
+ *
+ * https://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 io.micronaut.serde.support.serdes;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.ByteBuffer;
+
+/**
+ * Fork from `com.fasterxml.jackson.databind.util.ByteBufferBackedInputStream` licensed with Apache 2.0. License.
+ * Simple {@link InputStream} implementation that exposes currently
+ * available content of a {@link ByteBuffer}.
+ */
+public class ByteBufferBackedInputStream extends InputStream {
+    protected final ByteBuffer _b;
+
+    public ByteBufferBackedInputStream(ByteBuffer buf) { _b = buf; }
+
+    @Override public int available() { return _b.remaining(); }
+
+    @Override
+    public int read() throws IOException { return _b.hasRemaining() ? (_b.get() & 0xFF) : -1; }
+
+    @Override
+    public int read(byte[] bytes, int off, int len) throws IOException {
+        if (!_b.hasRemaining()) return -1;
+        len = Math.min(len, _b.remaining());
+        _b.get(bytes, off, len);
+        return len;
+    }
+}

serde-support/src/main/java/io/micronaut/serde/support/serdes/ByteBufferSerde.java

@@ -46,18 +46,23 @@ public void serialize(@NonNull Encoder encoder,
                           @NonNull EncoderContext context,
                           @NonNull Argument<? extends ByteBuffer> type,
                           @NonNull ByteBuffer value) throws IOException {
-        encodeByteBuffer(encoder, value);
-    }
-
-    private void encodeByteBuffer(@NonNull Encoder encoder,
-                                  @NonNull ByteBuffer value) throws IOException {
         if (value.hasArray()) {
             final int pos = value.position();
             int len = value.limit() - pos;
             int offset = value.arrayOffset() + pos;
             byte[] copy = new byte[len];
             System.arraycopy(value.array(), offset, copy, 0, len);
             encoder.encodeBinary(copy);
+            return;
+        }
+        // the other case is more complicated however. Best to handle with InputStream wrapper.
+        // But should we rewind it; and/or make a copy?
+        ByteBuffer copy = value.asReadOnlyBuffer();
+        if (copy.position() > 0) {
+            copy.rewind();
+        }
+        try (InputStream s = new ByteBufferBackedInputStream(copy)) {
+            encoder.encodeBinary(s.readAllBytes());
         }
     }
 }

test-suite-tck-serde/src/test/java/io/micronaut/serde/tck/tests/serde/SerializationSerdeSuite.java

@@ -6,9 +6,6 @@
 import org.junit.platform.suite.api.SuiteDisplayName;
 
 @Suite
-@ExcludeClassNamePatterns(
-    "io.micronaut.serde.tck.tests.bytebuffer.ByteBufferNativeTest" // https://github.com/FasterXML/jackson-databind/blob/2.16/src/main/java/com/fasterxml/jackson/databind/ser/std/ByteBufferSerializer.java#L27-L35
-)
 @SelectPackages("io.micronaut.serde.tck.tests")
 @SuiteDisplayName("Serialization TCK Serde")
 public class SerializationSerdeSuite {