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117 lines
4.3 KiB
C
117 lines
4.3 KiB
C
/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is HTML Parser C++ Translator code.
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*
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* The Initial Developer of the Original Code is
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* Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2009
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Henri Sivonen <hsivonen@iki.fi>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsICharsetConverterManager.h"
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#include "nsServiceManagerUtils.h"
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#include "nsICharsetAlias.h"
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#include "nsEncoderDecoderUtils.h"
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#include "nsTraceRefcnt.h"
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static NS_DEFINE_CID(kCharsetAliasCID, NS_CHARSETALIAS_CID);
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void
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nsHtml5MetaScanner::sniff(nsHtml5ByteReadable* bytes, nsIUnicodeDecoder** decoder, nsACString& charset)
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{
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readable = bytes;
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stateLoop(stateSave);
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readable = nsnull;
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if (mUnicodeDecoder) {
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mUnicodeDecoder.forget(decoder);
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charset.Assign(mCharset);
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}
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}
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bool
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nsHtml5MetaScanner::tryCharset(nsString* charset)
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{
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// This code needs to stay in sync with
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// nsHtml5StreamParser::internalEncodingDeclaration. Unfortunately, the
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// trickery with member fields here leads to some copy-paste reuse. :-(
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nsresult res = NS_OK;
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nsCOMPtr<nsICharsetConverterManager> convManager = do_GetService(NS_CHARSETCONVERTERMANAGER_CONTRACTID, &res);
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if (NS_FAILED(res)) {
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NS_ERROR("Could not get CharsetConverterManager service.");
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return false;
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}
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nsCAutoString encoding;
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CopyUTF16toUTF8(*charset, encoding);
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encoding.Trim(" \t\r\n\f");
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if (encoding.LowerCaseEqualsLiteral("utf-16") ||
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encoding.LowerCaseEqualsLiteral("utf-16be") ||
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encoding.LowerCaseEqualsLiteral("utf-16le")) {
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mCharset.Assign("UTF-8");
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res = convManager->GetUnicodeDecoderRaw(mCharset.get(), getter_AddRefs(mUnicodeDecoder));
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if (NS_FAILED(res)) {
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NS_ERROR("Could not get decoder for UTF-8.");
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return false;
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}
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return true;
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}
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nsCAutoString preferred;
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nsCOMPtr<nsICharsetAlias> calias(do_GetService(kCharsetAliasCID, &res));
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if (NS_FAILED(res)) {
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NS_ERROR("Could not get CharsetAlias service.");
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return false;
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}
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res = calias->GetPreferred(encoding, preferred);
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if (NS_FAILED(res)) {
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return false;
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}
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if (preferred.LowerCaseEqualsLiteral("utf-16") ||
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preferred.LowerCaseEqualsLiteral("utf-16be") ||
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preferred.LowerCaseEqualsLiteral("utf-16le") ||
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preferred.LowerCaseEqualsLiteral("utf-7") ||
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preferred.LowerCaseEqualsLiteral("jis_x0212-1990") ||
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preferred.LowerCaseEqualsLiteral("x-jis0208") ||
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preferred.LowerCaseEqualsLiteral("x-imap4-modified-utf7") ||
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preferred.LowerCaseEqualsLiteral("x-user-defined")) {
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return false;
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}
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res = convManager->GetUnicodeDecoderRaw(preferred.get(), getter_AddRefs(mUnicodeDecoder));
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if (res == NS_ERROR_UCONV_NOCONV) {
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return false;
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} else if (NS_FAILED(res)) {
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NS_ERROR("Getting an encoding decoder failed in a bad way.");
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mUnicodeDecoder = nsnull;
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return false;
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} else {
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NS_ASSERTION(mUnicodeDecoder, "Getter nsresult and object don't match.");
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mCharset.Assign(preferred);
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return true;
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}
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}
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