Case insensitivity option for #find_entry

lib/zip/entry_set.rb

@@ -13,8 +13,10 @@ module Zip
       @entry_set.include?(to_key(entry))
     end
 
-    def find_entry(entry)
-      @entry_set[to_key(entry)]
+    def find_entry(entry, case_sensitively = true)
+      return @entry_set[to_key(entry)] if case_sensitively
+      entry = @entry_set.find { |k, _| k.downcase == to_key(entry).downcase }
+      entry.last if entry
     end
 
     def <<(entry)

test/entry_set_test.rb

@@ -65,6 +65,12 @@ class ZipEntrySetTest < MiniTest::Test
     assert_equal(ZIP_ENTRIES, @zipEntrySet.entries)
   end
 
+  def test_find_entry
+    # by default, #find_entry is case-sensitive
+    assert_equal(ZIP_ENTRIES[0], @zipEntrySet.find_entry('name1'))
+    assert_equal(ZIP_ENTRIES[0], @zipEntrySet.find_entry('NaMe1', false))
+  end
+
   def test_entries_with_sort
     ::Zip.sort_entries = true
     assert_equal(ZIP_ENTRIES.sort, @zipEntrySet.entries)