PROPER case insensitivity handling

lib/zip.rb

@@ -37,7 +37,7 @@ end
 
 module Zip
   extend self
-  attr_accessor :unicode_names, :on_exists_proc, :continue_on_exists_proc, :sort_entries, :default_compression, :write_zip64_support, :warn_invalid_date
+  attr_accessor :unicode_names, :on_exists_proc, :continue_on_exists_proc, :sort_entries, :default_compression, :write_zip64_support, :warn_invalid_date, :case_insensitive_match
 
   def reset!
     @_ran_once = false
@@ -48,6 +48,7 @@ module Zip
     @default_compression = ::Zlib::DEFAULT_COMPRESSION
     @write_zip64_support = false
     @warn_invalid_date = true
+    @case_insensitive_match = false
   end
 
   def setup

lib/zip/entry_set.rb

@@ -78,7 +78,9 @@ module Zip
 
     private
     def to_key(entry)
-      entry.to_s.chomp('/')
+      k = entry.to_s.chomp('/')
+      k.downcase! if ::Zip.case_insensitive_match
+      k
     end
   end
 end

test/entry_set_test.rb

@@ -66,9 +66,17 @@ class ZipEntrySetTest < MiniTest::Test
   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))
+    entries = [::Zip::Entry.new("zipfile.zip", "MiXeDcAsEnAmE", "comment1")]
+
+    ::Zip.case_insensitive_match = true
+    zipEntrySet = ::Zip::EntrySet.new(entries)
+    assert_equal(entries[0], zipEntrySet.find_entry('MiXeDcAsEnAmE'))
+    assert_equal(entries[0], zipEntrySet.find_entry('mixedcasename'))
+
+    ::Zip.case_insensitive_match = false
+    zipEntrySet = ::Zip::EntrySet.new(entries)
+    assert_equal(entries[0], zipEntrySet.find_entry('MiXeDcAsEnAmE'))
+    assert_equal(nil, zipEntrySet.find_entry('mixedcasename'))
   end
 
   def test_entries_with_sort