michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include "mozilla/dom/EncodingUtils.h"
michael@0: 
michael@0: #include "mozilla/ArrayUtils.h" // ArrayLength
michael@0: #include "nsUConvPropertySearch.h"
michael@0: #include "nsIUnicodeDecoder.h"
michael@0: #include "nsIUnicodeEncoder.h"
michael@0: #include "nsComponentManagerUtils.h"
michael@0: 
michael@0: namespace mozilla {
michael@0: namespace dom {
michael@0: 
michael@0: static const char* labelsEncodings[][3] = {
michael@0: #include "labelsencodings.properties.h"
michael@0: };
michael@0: 
michael@0: bool
michael@0: EncodingUtils::FindEncodingForLabel(const nsACString& aLabel,
michael@0:                                     nsACString& aOutEncoding)
michael@0: {
michael@0:   // Save aLabel first because it may refer the same string as aOutEncoding.
michael@0:   nsCString label(aLabel);
michael@0: 
michael@0:   EncodingUtils::TrimSpaceCharacters(label);
michael@0:   if (label.IsEmpty()) {
michael@0:     aOutEncoding.Truncate();
michael@0:     return false;
michael@0:   }
michael@0: 
michael@0:   ToLowerCase(label);
michael@0:   return NS_SUCCEEDED(nsUConvPropertySearch::SearchPropertyValue(
michael@0:       labelsEncodings, ArrayLength(labelsEncodings), label, aOutEncoding));
michael@0: }
michael@0: 
michael@0: bool
michael@0: EncodingUtils::IsAsciiCompatible(const nsACString& aPreferredName)
michael@0: {
michael@0:   return !(aPreferredName.LowerCaseEqualsLiteral("utf-16") ||
michael@0:            aPreferredName.LowerCaseEqualsLiteral("utf-16be") ||
michael@0:            aPreferredName.LowerCaseEqualsLiteral("utf-16le") ||
michael@0:            aPreferredName.LowerCaseEqualsLiteral("replacement") ||
michael@0:            aPreferredName.LowerCaseEqualsLiteral("hz-gb-2312") ||
michael@0:            aPreferredName.LowerCaseEqualsLiteral("utf-7") ||
michael@0:            aPreferredName.LowerCaseEqualsLiteral("x-imap4-modified-utf7"));
michael@0: }
michael@0: 
michael@0: already_AddRefed<nsIUnicodeDecoder>
michael@0: EncodingUtils::DecoderForEncoding(const nsACString& aEncoding)
michael@0: {
michael@0:   nsAutoCString contractId(NS_UNICODEDECODER_CONTRACTID_BASE);
michael@0:   contractId.Append(aEncoding);
michael@0: 
michael@0:   nsCOMPtr<nsIUnicodeDecoder> decoder = do_CreateInstance(contractId.get());
michael@0:   MOZ_ASSERT(decoder, "Tried to create decoder for unknown encoding.");
michael@0:   return decoder.forget();
michael@0: }
michael@0: 
michael@0: already_AddRefed<nsIUnicodeEncoder>
michael@0: EncodingUtils::EncoderForEncoding(const nsACString& aEncoding)
michael@0: {
michael@0:   nsAutoCString contractId(NS_UNICODEENCODER_CONTRACTID_BASE);
michael@0:   contractId.Append(aEncoding);
michael@0: 
michael@0:   nsCOMPtr<nsIUnicodeEncoder> encoder = do_CreateInstance(contractId.get());
michael@0:   MOZ_ASSERT(encoder, "Tried to create encoder for unknown encoding.");
michael@0:   return encoder.forget();
michael@0: }
michael@0: 
michael@0: } // namespace dom
michael@0: } // namespace mozilla