1 files changed, 86 insertions, 0 deletions
diff --git a/comm/mailnews/intl/nsCharsetAlias.cpp b/comm/mailnews/intl/nsCharsetAlias.cpp
new file mode 100644
index 0000000000..a92cf193c9
--- /dev/null
+++ b/comm/mailnews/intl/nsCharsetAlias.cpp
@@ -0,0 +1,86 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/ArrayUtils.h"
+#include "mozilla/Encoding.h"
+
+#include "nsCharsetAlias.h"
+
+// for NS_ERROR_UCONV_NOCONV
+#include "nsCharsetConverterManager.h"
+
+#include "nsUConvPropertySearch.h"
+
+using namespace mozilla;
+
+//
+static const nsUConvProp kAliases[] = {
+#include "charsetalias.properties.h"
+};
+
+//--------------------------------------------------------------
+// static
+nsresult nsCharsetAlias::GetPreferredInternal(const nsACString& aAlias,
+                                              nsACString& oResult) {
+  // First check charsetalias.properties and if there is no match, continue to
+  // call Encoding::ForLabel.
+  nsAutoCString key(aAlias);
+  ToLowerCase(key);
+
+  nsresult rv = nsUConvPropertySearch::SearchPropertyValue(
+      kAliases, ArrayLength(kAliases), key, oResult);
+  if (NS_SUCCEEDED(rv)) {
+    return NS_OK;
+  }
+
+  const Encoding* encoding = Encoding::ForLabel(key);
+  if (!encoding) return NS_ERROR_NOT_AVAILABLE;
+  encoding->Name(oResult);
+  return NS_OK;
+}
+
+//--------------------------------------------------------------
+// static
+nsresult nsCharsetAlias::GetPreferred(const nsACString& aAlias,
+                                      nsACString& oResult) {
+  if (aAlias.IsEmpty()) return NS_ERROR_NULL_POINTER;
+
+  nsresult res = GetPreferredInternal(aAlias, oResult);
+  if (NS_FAILED(res)) return res;
+
+  if (nsCharsetConverterManager::IsInternal(oResult))
+    return NS_ERROR_UCONV_NOCONV;
+
+  return res;
+}
+
+//--------------------------------------------------------------
+// static
+nsresult nsCharsetAlias::Equals(const nsACString& aCharset1,
+                                const nsACString& aCharset2, bool* oResult) {
+  nsresult res = NS_OK;
+
+  if (aCharset1.Equals(aCharset2, nsCaseInsensitiveCStringComparator)) {
+    *oResult = true;
+    return res;
+  }
+
+  if (aCharset1.IsEmpty() || aCharset2.IsEmpty()) {
+    *oResult = false;
+    return res;
+  }
+
+  *oResult = false;
+  nsAutoCString name1;
+  res = GetPreferredInternal(aCharset1, name1);
+  if (NS_FAILED(res)) return res;
+
+  nsAutoCString name2;
+  res = GetPreferredInternal(aCharset2, name2);
+  if (NS_FAILED(res)) return res;
+
+  *oResult = name1.Equals(name2);
+  return NS_OK;
+}