public int getPackageIndexEntry(int i) {
		return package_index[i] & 0xffff;
	}
The value of each entry in the {@code package_index} table must be a valid index
into the constant pool. The entry at that index must be a {@link ConstantPoolPackageInfo} 
structure representing a package in the current module.
@param i entry
@return package index
Ghidra/Processors/JVM/src/main/java/ghidra/javaclass/format/attributes/ModulePackagesAttribute.java