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go/src/infra/libs/git/object.go

Index: go/src/infra/libs/git/object.go
diff --git a/go/src/infra/libs/git/object.go b/go/src/infra/libs/git/object.go
new file mode 100644
index 0000000000000000000000000000000000000000..06780e7bc4552116c2675d9f5c953d7f35612c18
--- /dev/null
+++ b/go/src/infra/libs/git/object.go
@@ -0,0 +1,57 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package git
+
+import (
+	"fmt"
+	"strings"
+)
+
+func ObjectFromRaw(typ ObjectType, data []byte) (InternableObject, error) {
+	return ObjectFromRawWithID(MakeObjectIDForData(typ, data), typ, data)
+}
+
+func ObjectFromRawWithID(id Identifiable, typ ObjectType, data []byte) (InternableObject, error) {
+	switch typ {
+	case BlobType:
+		return NewBlobFromRawWithID(id, data), nil
+	case TreeType:
+		return NewTreeFromRawWithID(id, data)
+	case CommitType:
+		return NewCommitFromRawWithID(id, data)
+	default:
+		return nil, fmt.Errorf("unsupported object type: %s", typ)
+	}
+}
+
+func InternImpl(s GitService, obj InternableObject, intern func(string) (string, error)) (*ObjectID, error) {
+	gotData := false
+	var data string
+	if !obj.Complete() {
+		gotData = true
+		data = obj.RawString()
+	}
+
+	if *obj.ID() == NoID {
+		return nil, fmt.Errorf("%v still has NoID after calling RawString()", obj)
+	}
+	if s.HasObjectID(obj) {
+		return obj.ID(), nil
+	}
+
+	switch obj.Type() {
+	case CommitType, BlobType, TreeType:
+	default:
+		return nil, fmt.Errorf("git.Intern: Unrecognized type %s", obj.Type())
+	}
+	if !gotData {
+		data = obj.RawString()
+	}
+	id_raw, err := intern(data)
+	if err != nil {
+		return nil, err
+	}
+	return MakeObjectIDErr(strings.TrimSpace(id_raw))
+}