Emilio Cobos Álvarez
2861287f6d
Autogenerated with:
cp dom/.clang-format widget/ && mach format widget/**.{cpp,h,mm}
Manual changes:
* Had to add a manual override in nsWaylandDisplay.h /
DMABufFormats.cpp to include mozwayland before protocols.
* Missing includes in nsWindowWayland/X11.h / nsDragService.
* nsFilePicker missed an nsWindow forward declaration.
* Various overrides in widget/windows because windows headers are order
dependent.
Differential Revision: https://phabricator.services.mozilla.com/D311688
114 lines
3.8 KiB
C++
114 lines
3.8 KiB
C++
/* 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/widget/nsGtkHtmlUtils.h"
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#include "mozilla/Encoding.h"
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#include "mozilla/Logging.h"
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#include "nsReadableUtils.h"
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using namespace mozilla;
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static mozilla::LazyLogModule sGtkHtmlLog("GtkHtmlUtils");
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#define GTK_HTML_LOG(...) \
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MOZ_LOG(sGtkHtmlLog, mozilla::LogLevel::Debug, (__VA_ARGS__))
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namespace mozilla::widget {
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/*
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* This function extracts the encoding label from the subset of HTML internal
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* encoding declaration syntax that uses the old long form with double quotes
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* and without spaces around the equals sign between the "content" attribute
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* name and the attribute value.
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*
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* This was added for the sake of an ancient version of StarOffice
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* in the pre-UTF-8 era in bug 123389. It is unclear if supporting
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* non-UTF-8 encodings is still necessary and if this function
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* still needs to exist.
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*
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* As of December 2022, both Gecko and LibreOffice emit an UTF-8
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* declaration that this function successfully extracts "UTF-8" from,
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* but that's also the default that we fall back on if this function
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* fails to extract a label.
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*/
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bool GetHTMLCharset(Span<const char> aData, nsCString& aFoundCharset) {
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// Assume ASCII first to find "charset" info
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const nsDependentCSubstring htmlStr(aData);
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nsACString::const_iterator start, end;
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htmlStr.BeginReading(start);
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htmlStr.EndReading(end);
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nsACString::const_iterator valueStart(start), valueEnd(start);
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if (CaseInsensitiveFindInReadable("CONTENT=\"text/html;"_ns, start, end)) {
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start = end;
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htmlStr.EndReading(end);
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if (CaseInsensitiveFindInReadable("charset="_ns, start, end)) {
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valueStart = end;
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start = end;
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htmlStr.EndReading(end);
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if (FindCharInReadable('"', start, end)) {
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valueEnd = start;
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}
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}
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}
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// find "charset" in HTML
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if (valueStart != valueEnd) {
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aFoundCharset = Substring(valueStart, valueEnd);
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ToUpperCase(aFoundCharset);
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return true;
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}
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return false;
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}
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bool DecodeHTMLData(Span<const char> aData, nsString& aOutDecoded) {
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nsAutoCString charset;
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if (!GetHTMLCharset(aData, charset)) {
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GTK_HTML_LOG("DecodeHTMLData: charset not found, falling back to utf-8");
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charset.AssignLiteral("utf-8");
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} else {
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GTK_HTML_LOG("DecodeHTMLData: detected charset %s", charset.get());
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}
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auto encoding = Encoding::ForLabelNoReplacement(charset);
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if (!encoding) {
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GTK_HTML_LOG("DecodeHTMLData: unrecognised charset label \"%s\"",
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charset.get());
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return false;
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}
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// Per spec, UTF-16BE/LE in HTML should be treated as UTF-8.
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// https://html.spec.whatwg.org/#determining-the-character-encoding:utf-16-encoding-2
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if (encoding == UTF_16LE_ENCODING || encoding == UTF_16BE_ENCODING) {
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GTK_HTML_LOG("DecodeHTMLData: UTF-16LE/BE overridden to UTF-8 per spec");
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encoding = UTF_8_ENCODING;
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}
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// Remove kHTMLMarkupPrefix again, it won't necessarily cause any
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// issues, but might confuse other users.
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const size_t prefixLen = std::size(kHTMLMarkupPrefix) - 1;
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if (aData.Length() >= prefixLen && nsDependentCSubstring(aData.To(prefixLen))
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.EqualsLiteral(kHTMLMarkupPrefix)) {
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aData = aData.From(prefixLen);
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}
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auto [rv, enc] = encoding->Decode(AsBytes(aData), aOutDecoded);
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if (enc != UTF_8_ENCODING &&
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MOZ_LOG_TEST(sGtkHtmlLog, mozilla::LogLevel::Debug)) {
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nsCString decoderName;
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enc->Name(decoderName);
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GTK_HTML_LOG("DecodeHTMLData: expected UTF-8 decoder but got %s",
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decoderName.get());
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}
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if (NS_FAILED(rv)) {
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GTK_HTML_LOG("DecodeHTMLData: decoding failed");
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}
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return NS_SUCCEEDED(rv);
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}
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} // namespace mozilla::widget
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#undef GTK_HTML_LOG
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