gecko/parser/html/nsHtml5MetaScannerCppSupplement.h
2011-10-17 10:59:28 -04:00

117 lines
4.3 KiB
C

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