1 files changed, 112 insertions, 0 deletions
diff --git a/dom/serializers/nsDOMSerializer.cpp b/dom/serializers/nsDOMSerializer.cpp
new file mode 100644
index 0000000000..98d92e64ce
--- /dev/null
+++ b/dom/serializers/nsDOMSerializer.cpp
@@ -0,0 +1,112 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsDOMSerializer.h"
+
+#include "mozilla/Encoding.h"
+#include "mozilla/dom/Document.h"
+#include "nsIDocumentEncoder.h"
+#include "nsComponentManagerUtils.h"
+#include "nsContentCID.h"
+#include "nsContentUtils.h"
+#include "nsError.h"
+#include "nsINode.h"
+
+using namespace mozilla;
+
+nsDOMSerializer::nsDOMSerializer() = default;
+
+static already_AddRefed<nsIDocumentEncoder> SetUpEncoder(
+    nsINode& aRoot, const nsAString& aCharset, ErrorResult& aRv) {
+  nsCOMPtr<nsIDocumentEncoder> encoder =
+      do_createDocumentEncoder("application/xhtml+xml");
+  if (!encoder) {
+    aRv.Throw(NS_ERROR_FAILURE);
+    return nullptr;
+  }
+
+  dom::Document* doc = aRoot.OwnerDoc();
+  bool entireDocument = (doc == &aRoot);
+
+  // This method will fail if no document
+  nsresult rv = encoder->NativeInit(
+      doc, u"application/xhtml+xml"_ns,
+      nsIDocumentEncoder::OutputRaw |
+          nsIDocumentEncoder::OutputDontRewriteEncodingDeclaration);
+
+  if (NS_FAILED(rv)) {
+    aRv.Throw(rv);
+    return nullptr;
+  }
+
+  NS_ConvertUTF16toUTF8 charset(aCharset);
+  if (charset.IsEmpty()) {
+    doc->GetDocumentCharacterSet()->Name(charset);
+  }
+  rv = encoder->SetCharset(charset);
+  if (NS_FAILED(rv)) {
+    aRv.Throw(rv);
+    return nullptr;
+  }
+
+  // If we are working on the entire document we do not need to
+  // specify which part to serialize
+  if (!entireDocument) {
+    rv = encoder->SetNode(&aRoot);
+  }
+
+  if (NS_FAILED(rv)) {
+    aRv.Throw(rv);
+    return nullptr;
+  }
+
+  return encoder.forget();
+}
+
+void nsDOMSerializer::SerializeToString(nsINode& aRoot, nsAString& aStr,
+                                        ErrorResult& aRv) {
+  aStr.Truncate();
+
+  if (!nsContentUtils::CanCallerAccess(&aRoot)) {
+    aRv.Throw(NS_ERROR_DOM_SECURITY_ERR);
+    return;
+  }
+
+  nsCOMPtr<nsIDocumentEncoder> encoder = SetUpEncoder(aRoot, u""_ns, aRv);
+  if (aRv.Failed()) {
+    return;
+  }
+
+  nsresult rv = encoder->EncodeToString(aStr);
+  if (NS_FAILED(rv)) {
+    aRv.Throw(rv);
+  }
+}
+
+void nsDOMSerializer::SerializeToStream(nsINode& aRoot,
+                                        nsIOutputStream* aStream,
+                                        const nsAString& aCharset,
+                                        ErrorResult& aRv) {
+  if (NS_WARN_IF(!aStream)) {
+    aRv.Throw(NS_ERROR_INVALID_ARG);
+    return;
+  }
+
+  // The charset arg can be empty, in which case we get the document's
+  // charset and use that when serializing.
+
+  // No point doing a CanCallerAccess check, because we can only be
+  // called by system JS or C++.
+  nsCOMPtr<nsIDocumentEncoder> encoder = SetUpEncoder(aRoot, aCharset, aRv);
+  if (aRv.Failed()) {
+    return;
+  }
+
+  nsresult rv = encoder->EncodeToStream(aStream);
+  if (NS_FAILED(rv)) {
+    aRv.Throw(rv);
+  }
+}