Extract jar-sorting to be accessible to soong_zip
Bug: 64536066
Test: m -j # which runs unit tests
Change-Id: I4830bd331c9dab0b1d300a18aefaf25a6af4cfdc
diff --git a/jar/jar.go b/jar/jar.go
new file mode 100644
index 0000000..d8f063c
--- /dev/null
+++ b/jar/jar.go
@@ -0,0 +1,55 @@
+// Copyright 2017 Google Inc. All rights reserved.
+//
+// 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 jar
+
+import (
+ "fmt"
+ "strings"
+)
+
+// EntryNamesLess tells whether <filepathA> should precede <filepathB> in
+// the order of files with a .jar
+func EntryNamesLess(filepathA string, filepathB string) (less bool) {
+ diff := index(filepathA) - index(filepathB)
+ if diff == 0 {
+ return filepathA < filepathB
+ }
+ return diff < 0
+}
+
+// Treats trailing * as a prefix match
+func patternMatch(pattern, name string) bool {
+ if strings.HasSuffix(pattern, "*") {
+ return strings.HasPrefix(name, strings.TrimSuffix(pattern, "*"))
+ } else {
+ return name == pattern
+ }
+}
+
+var jarOrder = []string{
+ "META-INF/",
+ "META-INF/MANIFEST.MF",
+ "META-INF/*",
+ "*",
+}
+
+func index(name string) int {
+ for i, pattern := range jarOrder {
+ if patternMatch(pattern, name) {
+ return i
+ }
+ }
+ panic(fmt.Errorf("file %q did not match any pattern", name))
+}