106 lines
3.3 KiB
C++
106 lines
3.3 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/dom/EncodingUtils.h"
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#include "mozilla/ArrayUtils.h" // ArrayLength
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#include "nsUConvPropertySearch.h"
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#include "nsIUnicodeDecoder.h"
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#include "nsIUnicodeEncoder.h"
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#include "nsComponentManagerUtils.h"
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namespace mozilla {
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namespace dom {
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static const char* labelsEncodings[][3] = {
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#include "labelsencodings.properties.h"
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};
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static const char* encodingsGroups[][3] = {
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#include "encodingsgroups.properties.h"
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};
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bool
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EncodingUtils::FindEncodingForLabel(const nsACString& aLabel,
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nsACString& aOutEncoding)
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{
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// Save aLabel first because it may refer the same string as aOutEncoding.
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nsCString label(aLabel);
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EncodingUtils::TrimSpaceCharacters(label);
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if (label.IsEmpty()) {
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aOutEncoding.Truncate();
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return false;
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}
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ToLowerCase(label);
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return NS_SUCCEEDED(nsUConvPropertySearch::SearchPropertyValue(
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labelsEncodings, ArrayLength(labelsEncodings), label, aOutEncoding));
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}
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bool
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EncodingUtils::FindEncodingForLabelNoReplacement(const nsACString& aLabel,
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nsACString& aOutEncoding)
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{
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if(!FindEncodingForLabel(aLabel, aOutEncoding)) {
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return false;
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}
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if (aOutEncoding.EqualsLiteral("replacement")) {
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aOutEncoding.Truncate();
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return false;
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}
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return true;
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}
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bool
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EncodingUtils::IsAsciiCompatible(const nsACString& aPreferredName)
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{
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// HZ and UTF-7 are no longer in mozilla-central, but keeping them here
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// just in case for the benefit of comm-central.
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return !(aPreferredName.LowerCaseEqualsLiteral("utf-16") ||
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aPreferredName.LowerCaseEqualsLiteral("utf-16be") ||
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aPreferredName.LowerCaseEqualsLiteral("utf-16le") ||
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aPreferredName.LowerCaseEqualsLiteral("replacement") ||
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aPreferredName.LowerCaseEqualsLiteral("hz-gb-2312") ||
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aPreferredName.LowerCaseEqualsLiteral("utf-7") ||
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aPreferredName.LowerCaseEqualsLiteral("x-imap4-modified-utf7"));
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}
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already_AddRefed<nsIUnicodeDecoder>
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EncodingUtils::DecoderForEncoding(const nsACString& aEncoding)
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{
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nsAutoCString contractId(NS_UNICODEDECODER_CONTRACTID_BASE);
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contractId.Append(aEncoding);
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nsCOMPtr<nsIUnicodeDecoder> decoder = do_CreateInstance(contractId.get());
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MOZ_ASSERT(decoder, "Tried to create decoder for unknown encoding.");
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return decoder.forget();
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}
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already_AddRefed<nsIUnicodeEncoder>
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EncodingUtils::EncoderForEncoding(const nsACString& aEncoding)
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{
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nsAutoCString contractId(NS_UNICODEENCODER_CONTRACTID_BASE);
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contractId.Append(aEncoding);
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nsCOMPtr<nsIUnicodeEncoder> encoder = do_CreateInstance(contractId.get());
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MOZ_ASSERT(encoder, "Tried to create encoder for unknown encoding.");
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return encoder.forget();
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}
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void
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EncodingUtils::LangGroupForEncoding(const nsACString& aEncoding,
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nsACString& aOutGroup)
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{
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if (NS_FAILED(nsUConvPropertySearch::SearchPropertyValue(
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encodingsGroups, ArrayLength(encodingsGroups), aEncoding, aOutGroup))) {
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aOutGroup.AssignLiteral("x-unicode");
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}
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}
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} // namespace dom
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} // namespace mozilla
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