1 files changed, 105 insertions, 0 deletions
diff --git a/dom/encoding/EncodingUtils.cpp b/dom/encoding/EncodingUtils.cpp
new file mode 100644
index 000000000..c9675bfcc
--- /dev/null
+++ b/dom/encoding/EncodingUtils.cpp
@@ -0,0 +1,105 @@
+/* -*- 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 "mozilla/dom/EncodingUtils.h"
+
+#include "mozilla/ArrayUtils.h" // ArrayLength
+#include "nsUConvPropertySearch.h"
+#include "nsIUnicodeDecoder.h"
+#include "nsIUnicodeEncoder.h"
+#include "nsComponentManagerUtils.h"
+
+namespace mozilla {
+namespace dom {
+
+static const nsUConvProp labelsEncodings[] = {
+#include "labelsencodings.properties.h"
+};
+
+static const nsUConvProp encodingsGroups[] = {
+#include "encodingsgroups.properties.h"
+};
+
+bool
+EncodingUtils::FindEncodingForLabel(const nsACString& aLabel,
+                                    nsACString& aOutEncoding)
+{
+  // Save aLabel first because it may refer the same string as aOutEncoding.
+  nsCString label(aLabel);
+
+  EncodingUtils::TrimSpaceCharacters(label);
+  if (label.IsEmpty()) {
+    aOutEncoding.Truncate();
+    return false;
+  }
+
+  ToLowerCase(label);
+  return NS_SUCCEEDED(nsUConvPropertySearch::SearchPropertyValue(
+      labelsEncodings, ArrayLength(labelsEncodings), label, aOutEncoding));
+}
+
+bool
+EncodingUtils::FindEncodingForLabelNoReplacement(const nsACString& aLabel,
+                                                 nsACString& aOutEncoding)
+{
+  if(!FindEncodingForLabel(aLabel, aOutEncoding)) {
+    return false;
+  }
+  if (aOutEncoding.EqualsLiteral("replacement")) {
+    aOutEncoding.Truncate();
+    return false;
+  }
+  return true;
+}
+
+bool
+EncodingUtils::IsAsciiCompatible(const nsACString& aPreferredName)
+{
+  // HZ and UTF-7 are no longer in mozilla-central, but keeping them here
+  // just in case for the benefit of comm-central.
+  return !(aPreferredName.LowerCaseEqualsLiteral("utf-16") ||
+           aPreferredName.LowerCaseEqualsLiteral("utf-16be") ||
+           aPreferredName.LowerCaseEqualsLiteral("utf-16le") ||
+           aPreferredName.LowerCaseEqualsLiteral("replacement") ||
+           aPreferredName.LowerCaseEqualsLiteral("hz-gb-2312") ||
+           aPreferredName.LowerCaseEqualsLiteral("utf-7") ||
+           aPreferredName.LowerCaseEqualsLiteral("x-imap4-modified-utf7"));
+}
+
+already_AddRefed<nsIUnicodeDecoder>
+EncodingUtils::DecoderForEncoding(const nsACString& aEncoding)
+{
+  nsAutoCString contractId(NS_UNICODEDECODER_CONTRACTID_BASE);
+  contractId.Append(aEncoding);
+
+  nsCOMPtr<nsIUnicodeDecoder> decoder = do_CreateInstance(contractId.get());
+  MOZ_ASSERT(decoder, "Tried to create decoder for unknown encoding.");
+  return decoder.forget();
+}
+
+already_AddRefed<nsIUnicodeEncoder>
+EncodingUtils::EncoderForEncoding(const nsACString& aEncoding)
+{
+  nsAutoCString contractId(NS_UNICODEENCODER_CONTRACTID_BASE);
+  contractId.Append(aEncoding);
+
+  nsCOMPtr<nsIUnicodeEncoder> encoder = do_CreateInstance(contractId.get());
+  MOZ_ASSERT(encoder, "Tried to create encoder for unknown encoding.");
+  return encoder.forget();
+}
+
+void
+EncodingUtils::LangGroupForEncoding(const nsACString& aEncoding,
+                                    nsACString& aOutGroup)
+{
+  if (NS_FAILED(nsUConvPropertySearch::SearchPropertyValue(
+      encodingsGroups, ArrayLength(encodingsGroups), aEncoding, aOutGroup))) {
+    aOutGroup.AssignLiteral("x-unicode");
+  }
+}
+
+} // namespace dom
+} // namespace mozilla