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/* 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 "nsICharsetConverterManager.h"
#include "nsServiceManagerUtils.h"
#include "nsEncoderDecoderUtils.h"
#include "nsTraceRefcnt.h"
#include "mozilla/dom/EncodingUtils.h"
using mozilla::dom::EncodingUtils;
void
nsHtml5MetaScanner::sniff(nsHtml5ByteReadable* bytes, nsIUnicodeDecoder** decoder, nsACString& charset)
{
readable = bytes;
stateLoop(stateSave);
readable = nullptr;
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;
}
nsAutoCString 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;
}
nsAutoCString preferred;
if (!EncodingUtils::FindEncodingForLabel(encoding, preferred)) {
return false;
}
if (preferred.LowerCaseEqualsLiteral("utf-16") ||
preferred.LowerCaseEqualsLiteral("utf-16be") ||
preferred.LowerCaseEqualsLiteral("utf-16le") ||
preferred.LowerCaseEqualsLiteral("utf-7") ||
preferred.LowerCaseEqualsLiteral("x-imap4-modified-utf7")) {
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 = nullptr;
return false;
} else {
NS_ASSERTION(mUnicodeDecoder, "Getter nsresult and object don't match.");
mCharset.Assign(preferred);
return true;
}
}
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