Parse the CONSTANT_Package_info constant pool entry from class files

src/etc/testcases/taskdefs/optional/depend/src6/module-info.java

@@ -1,3 +1,4 @@
 module dummy {
     requires java.base;
+    exports org.dummy;
 }

src/etc/testcases/taskdefs/optional/depend/src6/Foo.java → src/etc/testcases/taskdefs/optional/depend/src6/org.dummy/Foo.java

@@ -15,6 +15,8 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
+package org.dummy;
+
 public class Foo {
     public static void main(final String[] args) {
         System.out.println("foo");

src/main/org/apache/tools/ant/taskdefs/optional/depend/constantpool/ConstantPoolEntry.java

@@ -74,6 +74,10 @@ public abstract class ConstantPoolEntry {
     /** Tag value for CONSTANT_Module_info entry */
     public static final int CONSTANT_MODULEINFO = 19;
 
+    /** Tag value for CONSTANT_Package_info entry (within a module) */
+    public static final int CONSTANT_PACKAGEINFO = 20;
+
+
     /**
      * This entry's tag which identifies the type of this constant pool
      * entry.
@@ -168,6 +172,9 @@ public abstract class ConstantPoolEntry {
             case CONSTANT_MODULEINFO:
                 cpInfo = new ModuleCPInfo();
                 break;
+            case CONSTANT_PACKAGEINFO:
+                cpInfo = new PackageCPInfo();
+                break;
             default:
                 throw new ClassFormatError("Invalid Constant Pool entry Type "
                      + cpTag);

src/main/org/apache/tools/ant/taskdefs/optional/depend/constantpool/PackageCPInfo.java

@@ -0,0 +1,34 @@
+package org.apache.tools.ant.taskdefs.optional.depend.constantpool;
+
+import java.io.DataInputStream;
+import java.io.IOException;
+
+/**
+ * Represents the package info (within a module) constant pool entry
+ */
+public class PackageCPInfo extends ConstantCPInfo {
+
+    private int packageNameIndex;
+    private String packageName;
+
+    public PackageCPInfo() {
+        super(CONSTANT_PACKAGEINFO, 1);
+    }
+
+    @Override
+    public void read(final DataInputStream cpStream) throws IOException {
+        this.packageNameIndex = cpStream.readUnsignedShort();
+    }
+
+    @Override
+    public void resolve(final ConstantPool constantPool) {
+        this.packageName = ((Utf8CPInfo) constantPool.getEntry(this.packageNameIndex)).getValue();
+
+        super.resolve(constantPool);
+    }
+
+    @Override
+    public String toString() {
+        return "Package info Constant Pool Entry for " + this.packageName + "[" + this.packageNameIndex + "]";
+    }
+}