fix declaring of array types in binary format

src/de/inetsoftware/jwebassembly/binary/ArrayTypeEntry.java

@@ -0,0 +1,82 @@
+/*
+ * Copyright 2021 Volker Berlin (i-net software)
+ *
+ * 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 de.inetsoftware.jwebassembly.binary;
+
+import java.io.IOException;
+import java.util.List;
+
+import de.inetsoftware.jwebassembly.wasm.NamedStorageType;
+import de.inetsoftware.jwebassembly.wasm.ValueType;
+
+/**
+ * An array type entry in the type section of the WebAssembly.
+ * 
+ * @author Volker Berlin
+ */
+class ArrayTypeEntry extends TypeEntry {
+
+    private final NamedStorageType field;
+
+    /**
+     * Create a new instance.
+     * 
+     * @param fields
+     *            the fields of the array
+     */
+    ArrayTypeEntry( List<NamedStorageType> fields ) {
+        this.field = fields.get( 0 );
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    ValueType getTypeForm() {
+        return ValueType.array;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    void writeSectionEntryDetails( WasmOutputStream stream ) throws IOException {
+        stream.writeRefValueType( field.getType() );
+        stream.writeVarint( 1 ); // 0 - immutable; 1 - mutable 
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public int hashCode() {
+        return field.hashCode();
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public boolean equals( Object obj ) {
+        if( obj == this ) {
+            return true;
+        }
+        if( obj == null || obj.getClass() != getClass() ) {
+            return false;
+        }
+        ArrayTypeEntry entry = (ArrayTypeEntry)obj;
+        return field.equals( entry.field );
+    }
+}

src/de/inetsoftware/jwebassembly/binary/BinaryModuleWriter.java

@@ -507,7 +507,8 @@ public class BinaryModuleWriter extends ModuleWriter implements InstructionOpcod
         }
 
         int typeId = functionTypes.size();
-        functionTypes.add( new StructTypeEntry( type.getFields() ) );
+        List<NamedStorageType> fields = type.getFields();
+        functionTypes.add( type.getKind() == StructTypeKind.array_native ? new ArrayTypeEntry( fields ) : new StructTypeEntry( fields ) );
         return typeId;
     }