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Diffstat (limited to '')
| -rw-r--r-- | widget/gtk/nsClipboard.cpp | 1335 |
1 files changed, 1335 insertions, 0 deletions
diff --git a/widget/gtk/nsClipboard.cpp b/widget/gtk/nsClipboard.cpp new file mode 100644 index 0000000000..35b1dcbf9e --- /dev/null +++ b/widget/gtk/nsClipboard.cpp @@ -0,0 +1,1335 @@ +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim:expandtab:shiftwidth=2:tabstop=2: + */ +/* 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 "mozilla/ArrayUtils.h" + +#include "nsArrayUtils.h" +#include "nsClipboard.h" +#if defined(MOZ_X11) +# include "nsClipboardX11.h" +#endif +#if defined(MOZ_WAYLAND) +# include "nsClipboardWayland.h" +#endif +#include "nsGtkUtils.h" +#include "nsIURI.h" +#include "nsIFile.h" +#include "nsNetUtil.h" +#include "nsContentUtils.h" +#include "HeadlessClipboard.h" +#include "nsSupportsPrimitives.h" +#include "nsString.h" +#include "nsReadableUtils.h" +#include "nsPrimitiveHelpers.h" +#include "nsImageToPixbuf.h" +#include "nsStringStream.h" +#include "nsIFileURL.h" +#include "nsIObserverService.h" +#include "mozilla/Services.h" +#include "mozilla/RefPtr.h" +#include "mozilla/GRefPtr.h" +#include "mozilla/SchedulerGroup.h" +#include "mozilla/StaticPrefs_widget.h" +#include "mozilla/TimeStamp.h" +#include "GRefPtr.h" +#include "WidgetUtilsGtk.h" + +#include "imgIContainer.h" + +#include <gtk/gtk.h> +#if defined(MOZ_X11) +# include <gtk/gtkx.h> +#endif + +#include "mozilla/Encoding.h" + +using namespace mozilla; + +// Idle timeout for receiving selection and property notify events (microsec) +// Right now it's set to 1 sec. +const int kClipboardTimeout = 1000000; + +// Defines how many event loop iterations will be done without sleep. +// We ususally get data in first 2-3 iterations unless some large object +// (an image for instance) is transferred through clipboard. +const int kClipboardFastIterationNum = 3; + +// We add this prefix to HTML markup, so that GetHTMLCharset can correctly +// detect the HTML as UTF-8 encoded. +static const char kHTMLMarkupPrefix[] = + R"(<meta http-equiv="content-type" content="text/html; charset=utf-8">)"; + +static const char kURIListMime[] = "text/uri-list"; + +ClipboardTargets nsRetrievalContext::sClipboardTargets; +ClipboardTargets nsRetrievalContext::sPrimaryTargets; + +// Callback when someone asks us for the data +void clipboard_get_cb(GtkClipboard* aGtkClipboard, + GtkSelectionData* aSelectionData, guint info, + gpointer user_data); + +// Callback when someone asks us to clear a clipboard +void clipboard_clear_cb(GtkClipboard* aGtkClipboard, gpointer user_data); + +static bool GetHTMLCharset(Span<const char> aData, nsCString& str); + +static void SetTransferableData(nsITransferable* aTransferable, + const nsACString& aFlavor, + const char* aClipboardData, + uint32_t aClipboardDataLength) { + LOGCLIP("SetTransferableData MIME %s\n", PromiseFlatCString(aFlavor).get()); + nsCOMPtr<nsISupports> wrapper; + nsPrimitiveHelpers::CreatePrimitiveForData( + aFlavor, aClipboardData, aClipboardDataLength, getter_AddRefs(wrapper)); + aTransferable->SetTransferData(PromiseFlatCString(aFlavor).get(), wrapper); +} + +ClipboardTargets ClipboardTargets::Clone() { + ClipboardTargets ret; + ret.mCount = mCount; + if (mCount) { + ret.mTargets.reset( + reinterpret_cast<GdkAtom*>(g_malloc(sizeof(GdkAtom) * mCount))); + memcpy(ret.mTargets.get(), mTargets.get(), sizeof(GdkAtom) * mCount); + } + return ret; +} + +void ClipboardTargets::Set(ClipboardTargets aTargets) { + mCount = aTargets.mCount; + mTargets = std::move(aTargets.mTargets); +} + +void ClipboardData::SetData(Span<const uint8_t> aData) { + mData = nullptr; + mLength = aData.Length(); + if (mLength) { + mData.reset(reinterpret_cast<char*>(g_malloc(sizeof(char) * mLength))); + memcpy(mData.get(), aData.data(), sizeof(char) * mLength); + } +} + +void ClipboardData::SetText(Span<const char> aData) { + mData = nullptr; + mLength = aData.Length(); + if (mLength) { + mData.reset( + reinterpret_cast<char*>(g_malloc(sizeof(char) * (mLength + 1)))); + memcpy(mData.get(), aData.data(), sizeof(char) * mLength); + mData.get()[mLength] = '\0'; + } +} + +void ClipboardData::SetTargets(ClipboardTargets aTargets) { + mLength = aTargets.mCount; + mData.reset(reinterpret_cast<char*>(aTargets.mTargets.release())); +} + +ClipboardTargets ClipboardData::ExtractTargets() { + GUniquePtr<GdkAtom> targets(reinterpret_cast<GdkAtom*>(mData.release())); + uint32_t length = std::exchange(mLength, 0); + return ClipboardTargets{std::move(targets), length}; +} + +GdkAtom GetSelectionAtom(int32_t aWhichClipboard) { + if (aWhichClipboard == nsIClipboard::kGlobalClipboard) + return GDK_SELECTION_CLIPBOARD; + + return GDK_SELECTION_PRIMARY; +} + +int GetGeckoClipboardType(GtkClipboard* aGtkClipboard) { + if (aGtkClipboard == gtk_clipboard_get(GDK_SELECTION_PRIMARY)) + return nsClipboard::kSelectionClipboard; + else if (aGtkClipboard == gtk_clipboard_get(GDK_SELECTION_CLIPBOARD)) + return nsClipboard::kGlobalClipboard; + + return -1; // THAT AIN'T NO CLIPBOARD I EVER HEARD OF +} + +void nsRetrievalContext::ClearCachedTargetsClipboard(GtkClipboard* aClipboard, + GdkEvent* aEvent, + gpointer data) { + LOGCLIP("nsRetrievalContext::ClearCachedTargetsClipboard()"); + sClipboardTargets.Clear(); +} + +void nsRetrievalContext::ClearCachedTargetsPrimary(GtkClipboard* aClipboard, + GdkEvent* aEvent, + gpointer data) { + LOGCLIP("nsRetrievalContext::ClearCachedTargetsPrimary()"); + sPrimaryTargets.Clear(); +} + +ClipboardTargets nsRetrievalContext::GetTargets(int32_t aWhichClipboard) { + LOGCLIP("nsRetrievalContext::GetTargets(%s)\n", + aWhichClipboard == nsClipboard::kSelectionClipboard ? "primary" + : "clipboard"); + ClipboardTargets& storedTargets = + (aWhichClipboard == nsClipboard::kSelectionClipboard) ? sPrimaryTargets + : sClipboardTargets; + if (!storedTargets) { + LOGCLIP(" getting targets from system"); + storedTargets.Set(GetTargetsImpl(aWhichClipboard)); + } else { + LOGCLIP(" using cached targets"); + } + return storedTargets.Clone(); +} + +nsRetrievalContext::nsRetrievalContext() { + g_signal_connect(gtk_clipboard_get(GDK_SELECTION_CLIPBOARD), "owner-change", + G_CALLBACK(ClearCachedTargetsClipboard), this); + g_signal_connect(gtk_clipboard_get(GDK_SELECTION_PRIMARY), "owner-change", + G_CALLBACK(ClearCachedTargetsPrimary), this); +} + +nsRetrievalContext::~nsRetrievalContext() { + g_signal_handlers_disconnect_by_func( + gtk_clipboard_get(GDK_SELECTION_CLIPBOARD), + FuncToGpointer(ClearCachedTargetsClipboard), this); + g_signal_handlers_disconnect_by_func( + gtk_clipboard_get(GDK_SELECTION_PRIMARY), + FuncToGpointer(ClearCachedTargetsPrimary), this); + sClipboardTargets.Clear(); + sPrimaryTargets.Clear(); +} + +nsClipboard::nsClipboard() = default; + +nsClipboard::~nsClipboard() { + // We have to clear clipboard before gdk_display_close() call. + // See bug 531580 for details. + if (mGlobalTransferable) { + gtk_clipboard_clear(gtk_clipboard_get(GDK_SELECTION_CLIPBOARD)); + } + if (mSelectionTransferable) { + gtk_clipboard_clear(gtk_clipboard_get(GDK_SELECTION_PRIMARY)); + } +} + +NS_IMPL_ISUPPORTS(nsClipboard, nsIClipboard, nsIObserver) + +nsresult nsClipboard::Init(void) { +#if defined(MOZ_X11) + if (widget::GdkIsX11Display()) { + mContext = new nsRetrievalContextX11(); + } +#endif +#if defined(MOZ_WAYLAND) + if (widget::GdkIsWaylandDisplay()) { + mContext = new nsRetrievalContextWayland(); + } +#endif + + nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService(); + if (os) { + os->AddObserver(this, "xpcom-shutdown", false); + } + + return NS_OK; +} + +NS_IMETHODIMP +nsClipboard::Observe(nsISupports* aSubject, const char* aTopic, + const char16_t* aData) { + // Save global clipboard content to CLIPBOARD_MANAGER. + // gtk_clipboard_store() can run an event loop, so call from a dedicated + // runnable. + return SchedulerGroup::Dispatch( + TaskCategory::Other, + NS_NewRunnableFunction("gtk_clipboard_store()", []() { + LOGCLIP("nsClipboard storing clipboard content\n"); + gtk_clipboard_store(gtk_clipboard_get(GDK_SELECTION_CLIPBOARD)); + })); +} + +NS_IMETHODIMP +nsClipboard::SetData(nsITransferable* aTransferable, nsIClipboardOwner* aOwner, + int32_t aWhichClipboard) { + // See if we can short cut + if ((aWhichClipboard == kGlobalClipboard && + aTransferable == mGlobalTransferable.get() && + aOwner == mGlobalOwner.get()) || + (aWhichClipboard == kSelectionClipboard && + aTransferable == mSelectionTransferable.get() && + aOwner == mSelectionOwner.get())) { + return NS_OK; + } + + LOGCLIP("nsClipboard::SetData (%s)\n", + aWhichClipboard == kSelectionClipboard ? "primary" : "clipboard"); + + // List of suported targets + GtkTargetList* list = gtk_target_list_new(nullptr, 0); + + // Get the types of supported flavors + nsTArray<nsCString> flavors; + nsresult rv = aTransferable->FlavorsTransferableCanExport(flavors); + if (NS_FAILED(rv)) { + LOGCLIP(" FlavorsTransferableCanExport failed!\n"); + // Fall through. |gtkTargets| will be null below. + } + + // Add all the flavors to this widget's supported type. + bool imagesAdded = false; + for (uint32_t i = 0; i < flavors.Length(); i++) { + nsCString& flavorStr = flavors[i]; + LOGCLIP(" processing target %s\n", flavorStr.get()); + + // Special case text/unicode since we can handle all of the string types. + if (flavorStr.EqualsLiteral(kUnicodeMime)) { + LOGCLIP(" adding TEXT targets\n"); + gtk_target_list_add_text_targets(list, 0); + continue; + } + + if (nsContentUtils::IsFlavorImage(flavorStr)) { + // Don't bother adding image targets twice + if (!imagesAdded) { + // accept any writable image type + LOGCLIP(" adding IMAGE targets\n"); + gtk_target_list_add_image_targets(list, 0, TRUE); + imagesAdded = true; + } + continue; + } + + // Add this to our list of valid targets + LOGCLIP(" adding OTHER target %s\n", flavorStr.get()); + GdkAtom atom = gdk_atom_intern(flavorStr.get(), FALSE); + gtk_target_list_add(list, atom, 0, 0); + } + + // Get GTK clipboard (CLIPBOARD or PRIMARY) + GtkClipboard* gtkClipboard = + gtk_clipboard_get(GetSelectionAtom(aWhichClipboard)); + + gint numTargets = 0; + GtkTargetEntry* gtkTargets = + gtk_target_table_new_from_list(list, &numTargets); + if (!gtkTargets || numTargets == 0) { + LOGCLIP( + " gtk_target_table_new_from_list() failed or empty list of " + "targets!\n"); + // Clear references to the any old data and let GTK know that it is no + // longer available. + EmptyClipboard(aWhichClipboard); + return NS_ERROR_FAILURE; + } + + ClearCachedTargets(aWhichClipboard); + + // Set getcallback and request to store data after an application exit + if (gtk_clipboard_set_with_data(gtkClipboard, gtkTargets, numTargets, + clipboard_get_cb, clipboard_clear_cb, this)) { + // We managed to set-up the clipboard so update internal state + // We have to set it now because gtk_clipboard_set_with_data() calls + // clipboard_clear_cb() which reset our internal state + if (aWhichClipboard == kSelectionClipboard) { + mSelectionOwner = aOwner; + mSelectionTransferable = aTransferable; + } else { + mGlobalOwner = aOwner; + mGlobalTransferable = aTransferable; + gtk_clipboard_set_can_store(gtkClipboard, gtkTargets, numTargets); + } + + rv = NS_OK; + } else { + LOGCLIP(" gtk_clipboard_set_with_data() failed!\n"); + EmptyClipboard(aWhichClipboard); + rv = NS_ERROR_FAILURE; + } + + gtk_target_table_free(gtkTargets, numTargets); + gtk_target_list_unref(list); + + return rv; +} + +static bool IsMIMEAtFlavourList(const nsTArray<nsCString>& aFlavourList, + const char* aMime) { + for (const auto& flavorStr : aFlavourList) { + if (flavorStr.Equals(aMime)) { + return true; + } + } + return false; +} + +// When clipboard contains only images, X11/Gtk tries to convert them +// to text when we request text instead of just fail to provide the data. +// So if clipboard contains images only remove text MIME offer. +bool nsClipboard::FilterImportedFlavors(int32_t aWhichClipboard, + nsTArray<nsCString>& aFlavors) { + LOGCLIP("nsClipboard::FilterImportedFlavors"); + + auto targets = mContext->GetTargets(aWhichClipboard); + if (!targets) { + LOGCLIP(" X11: no targes at clipboard (null), quit.\n"); + return true; + } + + for (const auto& atom : targets.AsSpan()) { + GUniquePtr<gchar> atom_name(gdk_atom_name(atom)); + if (!atom_name) { + continue; + } + // Filter out system MIME types. + if (strcmp(atom_name.get(), "TARGETS") == 0 || + strcmp(atom_name.get(), "TIMESTAMP") == 0 || + strcmp(atom_name.get(), "SAVE_TARGETS") == 0 || + strcmp(atom_name.get(), "MULTIPLE") == 0) { + continue; + } + // Filter out types which can't be converted to text. + if (strncmp(atom_name.get(), "image/", 6) == 0 || + strncmp(atom_name.get(), "application/", 12) == 0 || + strncmp(atom_name.get(), "audio/", 6) == 0 || + strncmp(atom_name.get(), "video/", 6) == 0) { + continue; + } + // We have some other MIME type on clipboard which can be hopefully + // converted to text without any problem. + LOGCLIP(" X11: text types in clipboard, no need to filter them.\n"); + return true; + } + + // So make sure we offer only types we have at clipboard. + nsTArray<nsCString> clipboardFlavors; + for (const auto& atom : targets.AsSpan()) { + GUniquePtr<gchar> atom_name(gdk_atom_name(atom)); + if (!atom_name) { + continue; + } + if (IsMIMEAtFlavourList(aFlavors, atom_name.get())) { + clipboardFlavors.AppendElement(nsCString(atom_name.get())); + } + } + aFlavors.SwapElements(clipboardFlavors); +#ifdef MOZ_LOGGING + LOGCLIP(" X11: Flavors which match clipboard content:\n"); + for (uint32_t i = 0; i < aFlavors.Length(); i++) { + LOGCLIP(" %s\n", aFlavors[i].get()); + } +#endif + return true; +} + +static nsresult GetTransferableFlavors(nsITransferable* aTransferable, + nsTArray<nsCString>& aFlavors) { + if (!aTransferable) { + return NS_ERROR_FAILURE; + } + // Get a list of flavors this transferable can import + nsresult rv = aTransferable->FlavorsTransferableCanImport(aFlavors); + if (NS_FAILED(rv)) { + LOGCLIP(" FlavorsTransferableCanImport falied!\n"); + return rv; + } +#ifdef MOZ_LOGGING + LOGCLIP(" Flavors which can be imported:"); + for (const auto& flavor : aFlavors) { + LOGCLIP(" %s", flavor.get()); + } +#endif + return NS_OK; +} + +static bool TransferableSetFile(nsITransferable* aTransferable, + const nsACString& aURIList) { + nsresult rv; + nsTArray<nsCString> uris = mozilla::widget::ParseTextURIList(aURIList); + if (!uris.IsEmpty()) { + nsCOMPtr<nsIURI> fileURI; + NS_NewURI(getter_AddRefs(fileURI), uris[0]); + if (nsCOMPtr<nsIFileURL> fileURL = do_QueryInterface(fileURI, &rv)) { + nsCOMPtr<nsIFile> file; + rv = fileURL->GetFile(getter_AddRefs(file)); + if (NS_SUCCEEDED(rv)) { + aTransferable->SetTransferData(kFileMime, file); + LOGCLIP(" successfully set file to clipboard\n"); + return true; + } + } + } + return false; +} + +static bool TransferableSetHTML(nsITransferable* aTransferable, + Span<const char> aData) { + nsLiteralCString mimeType(kHTMLMime); + + // Convert text/html into our unicode format + nsAutoCString charset; + if (!GetHTMLCharset(aData, charset)) { + // Fall back to utf-8 in case html/data is missing kHTMLMarkupPrefix. + LOGCLIP("Failed to get html/text encoding, fall back to utf-8.\n"); + charset.AssignLiteral("utf-8"); + } + + LOGCLIP("TransferableSetHTML: HTML detected charset %s", charset.get()); + // app which use "text/html" to copy&paste + // get the decoder + auto encoding = Encoding::ForLabelNoReplacement(charset); + if (!encoding) { + LOGCLIP("TransferableSetHTML: get unicode decoder error (charset: %s)", + charset.get()); + return false; + } + + // According to spec html UTF-16BE/LE should be switched to UTF-8 + // https://html.spec.whatwg.org/#determining-the-character-encoding:utf-16-encoding-2 + if (encoding == UTF_16LE_ENCODING || encoding == UTF_16BE_ENCODING) { + encoding = UTF_8_ENCODING; + } + + // Remove kHTMLMarkupPrefix again, it won't necessarily cause any + // issues, but might confuse other users. + const size_t prefixLen = ArrayLength(kHTMLMarkupPrefix) - 1; + if (aData.Length() >= prefixLen && nsDependentCSubstring(aData.To(prefixLen)) + .EqualsLiteral(kHTMLMarkupPrefix)) { + aData = aData.From(prefixLen); + } + + nsAutoString unicodeData; + auto [rv, enc] = encoding->Decode(AsBytes(aData), unicodeData); +#if MOZ_LOGGING + if (enc != UTF_8_ENCODING && + MOZ_LOG_TEST(gClipboardLog, mozilla::LogLevel::Debug)) { + nsCString decoderName; + enc->Name(decoderName); + LOGCLIP("TransferableSetHTML: expected UTF-8 decoder but got %s", + decoderName.get()); + } +#endif + if (NS_FAILED(rv)) { + LOGCLIP("TransferableSetHTML: failed to decode HTML"); + return false; + } + SetTransferableData(aTransferable, mimeType, + (const char*)unicodeData.BeginReading(), + unicodeData.Length() * sizeof(char16_t)); + return true; +} + +NS_IMETHODIMP +nsClipboard::GetData(nsITransferable* aTransferable, int32_t aWhichClipboard) { + LOGCLIP("nsClipboard::GetData (%s)\n", + aWhichClipboard == kSelectionClipboard ? "primary" : "clipboard"); + + // TODO: Ensure we don't re-enter here. + if (!mContext) { + return NS_ERROR_FAILURE; + } + + nsTArray<nsCString> flavors; + nsresult rv = GetTransferableFlavors(aTransferable, flavors); + NS_ENSURE_SUCCESS(rv, rv); + + // Filter out MIME types on X11 to prevent unwanted conversions, + // see Bug 1611407 + if (widget::GdkIsX11Display() && + !FilterImportedFlavors(aWhichClipboard, flavors)) { + LOGCLIP(" Missing suitable clipboard data, quit."); + return NS_OK; + } + + for (uint32_t i = 0; i < flavors.Length(); i++) { + nsCString& flavorStr = flavors[i]; + + if (flavorStr.EqualsLiteral(kJPEGImageMime) || + flavorStr.EqualsLiteral(kJPGImageMime) || + flavorStr.EqualsLiteral(kPNGImageMime) || + flavorStr.EqualsLiteral(kGIFImageMime)) { + // Emulate support for image/jpg + if (flavorStr.EqualsLiteral(kJPGImageMime)) { + flavorStr.Assign(kJPEGImageMime); + } + + LOGCLIP(" Getting image %s MIME clipboard data\n", flavorStr.get()); + + auto clipboardData = + mContext->GetClipboardData(flavorStr.get(), aWhichClipboard); + if (!clipboardData) { + LOGCLIP(" %s type is missing\n", flavorStr.get()); + continue; + } + + nsCOMPtr<nsIInputStream> byteStream; + NS_NewByteInputStream(getter_AddRefs(byteStream), clipboardData.AsSpan(), + NS_ASSIGNMENT_COPY); + aTransferable->SetTransferData(flavorStr.get(), byteStream); + LOGCLIP(" got %s MIME data\n", flavorStr.get()); + return NS_OK; + } + + // Special case text/unicode since we can convert any + // string into text/unicode + if (flavorStr.EqualsLiteral(kUnicodeMime)) { + LOGCLIP(" Getting unicode %s MIME clipboard data\n", flavorStr.get()); + + auto clipboardData = mContext->GetClipboardText(aWhichClipboard); + if (!clipboardData) { + LOGCLIP(" failed to get unicode data\n"); + // If the type was text/unicode and we couldn't get + // text off the clipboard, run the next loop + // iteration. + continue; + } + + // Convert utf-8 into our unicode format. + NS_ConvertUTF8toUTF16 ucs2string(clipboardData.get()); + SetTransferableData(aTransferable, flavorStr, + (const char*)ucs2string.BeginReading(), + ucs2string.Length() * 2); + + LOGCLIP(" got unicode data, length %zd\n", ucs2string.Length()); + return NS_OK; + } + + if (flavorStr.EqualsLiteral(kFileMime)) { + LOGCLIP(" Getting %s file clipboard data\n", flavorStr.get()); + + auto clipboardData = + mContext->GetClipboardData(kURIListMime, aWhichClipboard); + if (!clipboardData) { + LOGCLIP(" text/uri-list type is missing\n"); + continue; + } + + nsDependentCSubstring fileName(clipboardData.AsSpan()); + if (!TransferableSetFile(aTransferable, fileName)) { + continue; + } + return NS_OK; + } + + LOGCLIP(" Getting %s MIME clipboard data\n", flavorStr.get()); + + auto clipboardData = + mContext->GetClipboardData(flavorStr.get(), aWhichClipboard); + +#ifdef MOZ_LOGGING + if (!clipboardData) { + LOGCLIP(" %s type is missing\n", flavorStr.get()); + } +#endif + + if (clipboardData) { + LOGCLIP(" got %s mime type data.\n", flavorStr.get()); + + // Special case text/html since we can convert into UCS2 + if (flavorStr.EqualsLiteral(kHTMLMime)) { + if (!TransferableSetHTML(aTransferable, clipboardData.AsSpan())) { + continue; + } + } else { + auto span = clipboardData.AsSpan(); + SetTransferableData(aTransferable, flavorStr, span.data(), + span.Length()); + } + return NS_OK; + } + } + + LOGCLIP(" failed to get clipboard content.\n"); + return NS_OK; +} + +enum DataType { + DATATYPE_IMAGE, + DATATYPE_FILE, + DATATYPE_HTML, + DATATYPE_RAW, +}; + +struct DataPromiseHandler { + RefPtr<nsITransferable> mTransferable; + RefPtr<GenericPromise::Private> mDataPromise; + nsCString mMimeType; + DataType mDataType; + + explicit DataPromiseHandler(RefPtr<nsITransferable> aTransferable, + RefPtr<GenericPromise::Private> aDataPromise, + const char* aMimeType, + DataType aDataType = DATATYPE_RAW) + : mTransferable(std::move(aTransferable)), + mDataPromise(std::move(aDataPromise)), + mMimeType(aMimeType), + mDataType(aDataType) { + MOZ_COUNT_CTOR(DataPromiseHandler); + LOGCLIP("DataPromiseHandler created [%p] MIME %s type %d", this, + mMimeType.get(), mDataType); + } + ~DataPromiseHandler() { + LOGCLIP("DataPromiseHandler deleted [%p]", this); + MOZ_COUNT_DTOR(DataPromiseHandler); + } +}; + +static RefPtr<GenericPromise> AsyncGetTextImpl(nsITransferable* aTransferable, + int32_t aWhichClipboard) { + LOGCLIP("AsyncGetText() type '%s'", + aWhichClipboard == nsClipboard::kSelectionClipboard ? "primary" + : "clipboard"); + + RefPtr<GenericPromise::Private> dataPromise = + new GenericPromise::Private(__func__); + + gtk_clipboard_request_text( + gtk_clipboard_get(GetSelectionAtom(aWhichClipboard)), + [](GtkClipboard* aClipboard, const gchar* aText, gpointer aData) -> void { + UniquePtr<DataPromiseHandler> ref( + static_cast<DataPromiseHandler*>(aData)); + LOGCLIP("AsyncGetText async handler of [%p]", aData); + + size_t dataLength = aText ? strlen(aText) : 0; + if (dataLength <= 0) { + ref->mDataPromise->Resolve(false, __func__); + LOGCLIP(" quit, text is not available"); + return; + } + + // Convert utf-8 into our unicode format. + NS_ConvertUTF8toUTF16 utf16string(aText, dataLength); + nsLiteralCString flavor(kUnicodeMime); + SetTransferableData(ref->mTransferable, flavor, + (const char*)utf16string.BeginReading(), + utf16string.Length() * 2); + LOGCLIP(" text is set, length = %d", (int)dataLength); + ref->mDataPromise->Resolve(true, __func__); + }, + new DataPromiseHandler(aTransferable, dataPromise, kUnicodeMime)); + + return dataPromise; +} + +static RefPtr<GenericPromise> AsyncGetDataImpl(nsITransferable* aTransferable, + int32_t aWhichClipboard, + const char* aMimeType, + DataType aDataType) { + LOGCLIP("AsyncGetText() type '%s'", + aWhichClipboard == nsClipboard::kSelectionClipboard ? "primary" + : "clipboard"); + + RefPtr<GenericPromise::Private> dataPromise = + new GenericPromise::Private(__func__); + + const char* gtkMIMEType = nullptr; + switch (aDataType) { + case DATATYPE_FILE: + // Don't ask Gtk for application/x-moz-file + gtkMIMEType = kURIListMime; + break; + case DATATYPE_IMAGE: + case DATATYPE_HTML: + case DATATYPE_RAW: + gtkMIMEType = aMimeType; + break; + } + + gtk_clipboard_request_contents( + gtk_clipboard_get(GetSelectionAtom(aWhichClipboard)), + gdk_atom_intern(gtkMIMEType, FALSE), + [](GtkClipboard* aClipboard, GtkSelectionData* aSelection, + gpointer aData) -> void { + UniquePtr<DataPromiseHandler> ref( + static_cast<DataPromiseHandler*>(aData)); + LOGCLIP("AsyncGetData async handler [%p] MIME %s type %d", aData, + ref->mMimeType.get(), ref->mDataType); + + int dataLength = gtk_selection_data_get_length(aSelection); + if (dataLength <= 0) { + ref->mDataPromise->Resolve(false, __func__); + return; + } + const char* data = (const char*)gtk_selection_data_get_data(aSelection); + if (!data) { + ref->mDataPromise->Resolve(false, __func__); + return; + } + switch (ref->mDataType) { + case DATATYPE_IMAGE: { + LOGCLIP(" set image clipboard data"); + nsCOMPtr<nsIInputStream> byteStream; + NS_NewByteInputStream(getter_AddRefs(byteStream), + Span(data, dataLength), NS_ASSIGNMENT_COPY); + ref->mTransferable->SetTransferData(ref->mMimeType.get(), + byteStream); + break; + } + case DATATYPE_FILE: { + LOGCLIP(" set file clipboard data"); + nsDependentCSubstring file(data, dataLength); + TransferableSetFile(ref->mTransferable, file); + break; + } + case DATATYPE_HTML: { + LOGCLIP(" html clipboard data"); + Span dataSpan(data, dataLength); + TransferableSetHTML(ref->mTransferable, dataSpan); + break; + } + case DATATYPE_RAW: { + LOGCLIP(" raw clipboard data %s", ref->mMimeType.get()); + SetTransferableData(ref->mTransferable, ref->mMimeType, data, + dataLength); + break; + } + } + ref->mDataPromise->Resolve(true, __func__); + }, + new DataPromiseHandler(aTransferable, dataPromise, aMimeType, aDataType)); + return dataPromise; +} + +static RefPtr<GenericPromise> AsyncGetDataFlavor(nsITransferable* aTransferable, + int32_t aWhichClipboard, + nsCString& aFlavorStr) { + if (aFlavorStr.EqualsLiteral(kJPEGImageMime) || + aFlavorStr.EqualsLiteral(kJPGImageMime) || + aFlavorStr.EqualsLiteral(kPNGImageMime) || + aFlavorStr.EqualsLiteral(kGIFImageMime)) { + // Emulate support for image/jpg + if (aFlavorStr.EqualsLiteral(kJPGImageMime)) { + aFlavorStr.Assign(kJPEGImageMime); + } + LOGCLIP(" Getting image %s MIME clipboard data", aFlavorStr.get()); + return AsyncGetDataImpl(aTransferable, aWhichClipboard, aFlavorStr.get(), + DATATYPE_IMAGE); + } + // Special case text/unicode since we can convert any + // string into text/unicode + if (aFlavorStr.EqualsLiteral(kUnicodeMime)) { + LOGCLIP(" Getting unicode clipboard data"); + return AsyncGetTextImpl(aTransferable, aWhichClipboard); + } + if (aFlavorStr.EqualsLiteral(kFileMime)) { + LOGCLIP(" Getting file clipboard data\n"); + return AsyncGetDataImpl(aTransferable, aWhichClipboard, aFlavorStr.get(), + DATATYPE_FILE); + } + if (aFlavorStr.EqualsLiteral(kHTMLMime)) { + LOGCLIP(" Getting HTML clipboard data"); + return AsyncGetDataImpl(aTransferable, aWhichClipboard, aFlavorStr.get(), + DATATYPE_HTML); + } + LOGCLIP(" Getting raw %s MIME clipboard data\n", aFlavorStr.get()); + return AsyncGetDataImpl(aTransferable, aWhichClipboard, aFlavorStr.get(), + DATATYPE_RAW); +} + +RefPtr<GenericPromise> nsClipboard::AsyncGetData(nsITransferable* aTransferable, + int32_t aWhichClipboard) { + LOGCLIP("nsClipboard::AsyncGetData (%s)", + aWhichClipboard == nsClipboard::kSelectionClipboard ? "primary" + : "clipboard"); + nsTArray<nsCString> importedFlavors; + nsresult rv = GetTransferableFlavors(aTransferable, importedFlavors); + NS_ENSURE_SUCCESS(rv, GenericPromise::CreateAndReject(rv, __func__)); + + auto flavorsNum = importedFlavors.Length(); + if (!flavorsNum) { + return GenericPromise::CreateAndResolve(false, __func__); + } +#ifdef MOZ_LOGGING + if (flavorsNum > 1) { + LOGCLIP(" Only first MIME type (%s) will be imported from clipboard!", + importedFlavors[0].get()); + } +#endif + + // Filter out MIME types on X11 to prevent unwanted conversions, + // see Bug 1611407 + if (widget::GdkIsX11Display()) { + return AsyncHasDataMatchingFlavors(importedFlavors, aWhichClipboard) + ->Then( + GetMainThreadSerialEventTarget(), __func__, + /* resolve */ + [transferable = RefPtr{aTransferable}, + aWhichClipboard](nsTArray<nsCString> clipboardFlavors) { + if (!clipboardFlavors.Length()) { + LOGCLIP(" no flavors in clipboard, quit."); + return GenericPromise::CreateAndResolve(false, __func__); + } + return AsyncGetDataFlavor(transferable, aWhichClipboard, + clipboardFlavors[0]); + }, + /* reject */ + [](nsresult rv) { + LOGCLIP(" failed to get flavors from clipboard, quit."); + return GenericPromise::CreateAndReject(rv, __func__); + }); + } + + // Read clipboard directly on Wayland + return AsyncGetDataFlavor(aTransferable, aWhichClipboard, importedFlavors[0]); +} + +NS_IMETHODIMP +nsClipboard::EmptyClipboard(int32_t aWhichClipboard) { + LOGCLIP("nsClipboard::EmptyClipboard (%s)\n", + aWhichClipboard == kSelectionClipboard ? "primary" : "clipboard"); + if (aWhichClipboard == kSelectionClipboard) { + if (mSelectionTransferable) { + gtk_clipboard_clear(gtk_clipboard_get(GDK_SELECTION_PRIMARY)); + MOZ_ASSERT(!mSelectionTransferable); + } + } else { + if (mGlobalTransferable) { + gtk_clipboard_clear(gtk_clipboard_get(GDK_SELECTION_CLIPBOARD)); + MOZ_ASSERT(!mGlobalTransferable); + } + } + ClearCachedTargets(aWhichClipboard); + return NS_OK; +} + +void nsClipboard::ClearTransferable(int32_t aWhichClipboard) { + if (aWhichClipboard == kSelectionClipboard) { + if (mSelectionOwner) { + mSelectionOwner->LosingOwnership(mSelectionTransferable); + mSelectionOwner = nullptr; + } + mSelectionTransferable = nullptr; + } else { + if (mGlobalOwner) { + mGlobalOwner->LosingOwnership(mGlobalTransferable); + mGlobalOwner = nullptr; + } + mGlobalTransferable = nullptr; + } +} + +static bool FlavorMatchesTarget(const nsACString& aFlavor, GdkAtom aTarget) { + GUniquePtr<gchar> atom_name(gdk_atom_name(aTarget)); + if (!atom_name) { + return false; + } + if (aFlavor.Equals(atom_name.get())) { + LOGCLIP(" has %s\n", atom_name.get()); + return true; + } + // X clipboard supports image/jpeg, but we want to emulate support + // for image/jpg as well + if (aFlavor.EqualsLiteral(kJPGImageMime) && + !strcmp(atom_name.get(), kJPEGImageMime)) { + LOGCLIP(" has image/jpg\n"); + return true; + } + // application/x-moz-file should be treated like text/uri-list + if (aFlavor.EqualsLiteral(kFileMime) && + !strcmp(atom_name.get(), kURIListMime)) { + LOGCLIP(" has text/uri-list treating as application/x-moz-file"); + return true; + } + return false; +} + +NS_IMETHODIMP +nsClipboard::HasDataMatchingFlavors(const nsTArray<nsCString>& aFlavorList, + int32_t aWhichClipboard, bool* _retval) { + if (!_retval) { + return NS_ERROR_NULL_POINTER; + } + + LOGCLIP("nsClipboard::HasDataMatchingFlavors (%s)\n", + aWhichClipboard == kSelectionClipboard ? "primary" : "clipboard"); + + *_retval = false; + + if (!mContext) { + return NS_ERROR_FAILURE; + } + + auto targets = mContext->GetTargets(aWhichClipboard); + if (!targets) { + LOGCLIP(" no targes at clipboard (null)\n"); + return NS_OK; + } + +#ifdef MOZ_LOGGING + if (LOGCLIP_ENABLED()) { + LOGCLIP(" Asking for content:\n"); + for (auto& flavor : aFlavorList) { + LOGCLIP(" MIME %s\n", flavor.get()); + } + LOGCLIP(" Clipboard content (target nums %zu):\n", + targets.AsSpan().Length()); + for (const auto& target : targets.AsSpan()) { + GUniquePtr<gchar> atom_name(gdk_atom_name(target)); + if (!atom_name) { + LOGCLIP(" failed to get MIME\n"); + continue; + } + LOGCLIP(" MIME %s\n", atom_name.get()); + } + } +#endif + + // Walk through the provided types and try to match it to a + // provided type. + for (auto& flavor : aFlavorList) { + // We special case text/unicode here. + if (flavor.EqualsLiteral(kUnicodeMime) && + gtk_targets_include_text(targets.AsSpan().data(), + targets.AsSpan().Length())) { + *_retval = true; + LOGCLIP(" has kUnicodeMime\n"); + return NS_OK; + } + for (const auto& target : targets.AsSpan()) { + if (FlavorMatchesTarget(flavor, target)) { + *_retval = true; + return NS_OK; + } + } + } + + LOGCLIP(" no targes at clipboard (bad match)\n"); + return NS_OK; +} + +struct TragetPromiseHandler { + TragetPromiseHandler(const nsTArray<nsCString>& aAcceptedFlavorList, + RefPtr<DataFlavorsPromise::Private> aTargetsPromise) + : mAcceptedFlavorList(aAcceptedFlavorList.Clone()), + mTargetsPromise(aTargetsPromise) { + LOGCLIP("TragetPromiseHandler(%p) created", this); + } + ~TragetPromiseHandler() { LOGCLIP("TragetPromiseHandler(%p) deleted", this); } + nsTArray<nsCString> mAcceptedFlavorList; + RefPtr<DataFlavorsPromise::Private> mTargetsPromise; +}; + +RefPtr<DataFlavorsPromise> nsClipboard::AsyncHasDataMatchingFlavors( + const nsTArray<nsCString>& aFlavorList, int32_t aWhichClipboard) { + LOGCLIP("nsClipboard::AsyncHasDataMatchingFlavors() type %s", + aWhichClipboard == kSelectionClipboard ? "primary" : "clipboard"); + + RefPtr<DataFlavorsPromise::Private> flavorPromise = + new DataFlavorsPromise::Private(__func__); + gtk_clipboard_request_contents( + gtk_clipboard_get(GetSelectionAtom(aWhichClipboard)), + gdk_atom_intern("TARGETS", FALSE), + [](GtkClipboard* aClipboard, GtkSelectionData* aSelection, + gpointer aData) -> void { + LOGCLIP("gtk_clipboard_request_contents async handler (%p)", aData); + UniquePtr<TragetPromiseHandler> handler( + static_cast<TragetPromiseHandler*>(aData)); + + GdkAtom* targets = nullptr; + gint targetsNum = 0; + if (gtk_selection_data_get_length(aSelection) > 0) { + gtk_selection_data_get_targets(aSelection, &targets, &targetsNum); + } + nsTArray<nsCString> results; + if (targetsNum) { + for (auto& flavor : handler->mAcceptedFlavorList) { + LOGCLIP(" looking for %s", flavor.get()); + // We can convert any text to unicode. + if (flavor.EqualsLiteral(kUnicodeMime) && + gtk_targets_include_text(targets, targetsNum)) { + results.AppendElement(flavor); + LOGCLIP(" has kUnicodeMime\n"); + continue; + } + for (int i = 0; i < targetsNum; i++) { + if (FlavorMatchesTarget(flavor, targets[i])) { + results.AppendElement(flavor); + } + } + } + } + handler->mTargetsPromise->Resolve(std::move(results), __func__); + }, + new TragetPromiseHandler(aFlavorList, flavorPromise)); + + return flavorPromise.forget(); +} + +NS_IMETHODIMP +nsClipboard::SupportsSelectionClipboard(bool* _retval) { + *_retval = true; + return NS_OK; +} + +NS_IMETHODIMP +nsClipboard::SupportsFindClipboard(bool* _retval) { + *_retval = false; + return NS_OK; +} + +nsITransferable* nsClipboard::GetTransferable(int32_t aWhichClipboard) { + nsITransferable* retval; + + if (aWhichClipboard == kSelectionClipboard) + retval = mSelectionTransferable.get(); + else + retval = mGlobalTransferable.get(); + + return retval; +} + +void nsClipboard::SelectionGetEvent(GtkClipboard* aClipboard, + GtkSelectionData* aSelectionData) { + // Someone has asked us to hand them something. The first thing + // that we want to do is see if that something includes text. If + // it does, try to give it text/unicode after converting it to + // utf-8. + + int32_t whichClipboard; + + // which clipboard? + GdkAtom selection = gtk_selection_data_get_selection(aSelectionData); + if (selection == GDK_SELECTION_PRIMARY) + whichClipboard = kSelectionClipboard; + else if (selection == GDK_SELECTION_CLIPBOARD) + whichClipboard = kGlobalClipboard; + else + return; // THAT AIN'T NO CLIPBOARD I EVER HEARD OF + + LOGCLIP("nsClipboard::SelectionGetEvent (%s)\n", + whichClipboard == kSelectionClipboard ? "primary" : "clipboard"); + + nsCOMPtr<nsITransferable> trans = GetTransferable(whichClipboard); + if (!trans) { + // We have nothing to serve + LOGCLIP("nsClipboard::SelectionGetEvent() - %s clipboard is empty!\n", + whichClipboard == kSelectionClipboard ? "Primary" : "Clipboard"); + return; + } + + nsresult rv; + nsCOMPtr<nsISupports> item; + + GdkAtom selectionTarget = gtk_selection_data_get_target(aSelectionData); + LOGCLIP(" selection target %s\n", + GUniquePtr<gchar>(gdk_atom_name(selectionTarget)).get()); + + // Check to see if the selection data is some text type. + if (gtk_targets_include_text(&selectionTarget, 1)) { + LOGCLIP(" providing text/unicode data\n"); + // Try to convert our internal type into a text string. Get + // the transferable for this clipboard and try to get the + // text/unicode type for it. + rv = trans->GetTransferData("text/unicode", getter_AddRefs(item)); + if (NS_FAILED(rv) || !item) { + LOGCLIP(" GetTransferData() failed to get text/unicode!\n"); + return; + } + + nsCOMPtr<nsISupportsString> wideString; + wideString = do_QueryInterface(item); + if (!wideString) return; + + nsAutoString ucs2string; + wideString->GetData(ucs2string); + NS_ConvertUTF16toUTF8 utf8string(ucs2string); + + LOGCLIP(" sent %zd bytes of utf-8 data\n", utf8string.Length()); + if (selectionTarget == gdk_atom_intern("text/plain;charset=utf-8", FALSE)) { + LOGCLIP( + " using gtk_selection_data_set for 'text/plain;charset=utf-8'\n"); + // Bypass gtk_selection_data_set_text, which will convert \n to \r\n + // in some versions of GTK. + gtk_selection_data_set(aSelectionData, selectionTarget, 8, + reinterpret_cast<const guchar*>(utf8string.get()), + utf8string.Length()); + } else { + gtk_selection_data_set_text(aSelectionData, utf8string.get(), + utf8string.Length()); + } + return; + } + + // Check to see if the selection data is an image type + if (gtk_targets_include_image(&selectionTarget, 1, TRUE)) { + LOGCLIP(" providing image data\n"); + // Look through our transfer data for the image + static const char* const imageMimeTypes[] = {kNativeImageMime, + kPNGImageMime, kJPEGImageMime, + kJPGImageMime, kGIFImageMime}; + nsCOMPtr<nsISupports> imageItem; + nsCOMPtr<imgIContainer> image; + for (uint32_t i = 0; i < ArrayLength(imageMimeTypes); i++) { + rv = trans->GetTransferData(imageMimeTypes[i], getter_AddRefs(imageItem)); + if (NS_FAILED(rv)) { + LOGCLIP(" %s is missing at GetTransferData()\n", imageMimeTypes[i]); + continue; + } + + image = do_QueryInterface(imageItem); + if (image) { + LOGCLIP(" %s is available at GetTransferData()\n", + imageMimeTypes[i]); + break; + } + } + + if (!image) { // Not getting an image for an image mime type!? + LOGCLIP(" Failed to get any image mime from GetTransferData()!\n"); + return; + } + + RefPtr<GdkPixbuf> pixbuf = nsImageToPixbuf::ImageToPixbuf(image); + if (!pixbuf) { + LOGCLIP(" nsImageToPixbuf::ImageToPixbuf() failed!\n"); + return; + } + + LOGCLIP(" Setting pixbuf image data as %s\n", + GUniquePtr<gchar>(gdk_atom_name(selectionTarget)).get()); + gtk_selection_data_set_pixbuf(aSelectionData, pixbuf); + return; + } + + if (selectionTarget == gdk_atom_intern(kHTMLMime, FALSE)) { + LOGCLIP(" providing %s data\n", kHTMLMime); + rv = trans->GetTransferData(kHTMLMime, getter_AddRefs(item)); + if (NS_FAILED(rv) || !item) { + LOGCLIP(" failed to get %s data by GetTransferData()!\n", kHTMLMime); + return; + } + + nsCOMPtr<nsISupportsString> wideString; + wideString = do_QueryInterface(item); + if (!wideString) { + LOGCLIP(" failed to get wideString interface!"); + return; + } + + nsAutoString ucs2string; + wideString->GetData(ucs2string); + + nsAutoCString html; + // Add the prefix so the encoding is correctly detected. + html.AppendLiteral(kHTMLMarkupPrefix); + AppendUTF16toUTF8(ucs2string, html); + + LOGCLIP(" Setting %zd bytest of %s data\n", html.Length(), + GUniquePtr<gchar>(gdk_atom_name(selectionTarget)).get()); + gtk_selection_data_set(aSelectionData, selectionTarget, 8, + (const guchar*)html.get(), html.Length()); + return; + } + + LOGCLIP(" Try if we have anything at GetTransferData() for %s\n", + GUniquePtr<gchar>(gdk_atom_name(selectionTarget)).get()); + + // Try to match up the selection data target to something our + // transferable provides. + GUniquePtr<gchar> target_name(gdk_atom_name(selectionTarget)); + if (!target_name) { + LOGCLIP(" Failed to get target name!\n"); + return; + } + + rv = trans->GetTransferData(target_name.get(), getter_AddRefs(item)); + // nothing found? + if (NS_FAILED(rv) || !item) { + LOGCLIP(" Failed to get anything from GetTransferData()!\n"); + return; + } + + void* primitive_data = nullptr; + uint32_t dataLen = 0; + nsPrimitiveHelpers::CreateDataFromPrimitive( + nsDependentCString(target_name.get()), item, &primitive_data, &dataLen); + if (!primitive_data) { + LOGCLIP(" Failed to get primitive data!\n"); + return; + } + + LOGCLIP(" Setting %s as a primitive data type, %d bytes\n", + target_name.get(), dataLen); + gtk_selection_data_set(aSelectionData, selectionTarget, + 8, /* 8 bits in a unit */ + (const guchar*)primitive_data, dataLen); + free(primitive_data); +} + +void nsClipboard::ClearCachedTargets(int32_t aWhichClipboard) { + if (aWhichClipboard == kSelectionClipboard) { + nsRetrievalContext::ClearCachedTargetsPrimary(nullptr, nullptr, nullptr); + } else { + nsRetrievalContext::ClearCachedTargetsClipboard(nullptr, nullptr, nullptr); + } +} + +void nsClipboard::SelectionClearEvent(GtkClipboard* aGtkClipboard) { + int32_t whichClipboard = GetGeckoClipboardType(aGtkClipboard); + if (whichClipboard < 0) { + return; + } + LOGCLIP("nsClipboard::SelectionClearEvent (%s)\n", + whichClipboard == kSelectionClipboard ? "primary" : "clipboard"); + ClearCachedTargets(whichClipboard); + ClearTransferable(whichClipboard); +} + +void clipboard_get_cb(GtkClipboard* aGtkClipboard, + GtkSelectionData* aSelectionData, guint info, + gpointer user_data) { + LOGCLIP("clipboard_get_cb() callback\n"); + nsClipboard* aClipboard = static_cast<nsClipboard*>(user_data); + aClipboard->SelectionGetEvent(aGtkClipboard, aSelectionData); +} + +void clipboard_clear_cb(GtkClipboard* aGtkClipboard, gpointer user_data) { + LOGCLIP("clipboard_clear_cb() callback\n"); + nsClipboard* aClipboard = static_cast<nsClipboard*>(user_data); + aClipboard->SelectionClearEvent(aGtkClipboard); +} + +/* + * This function extracts the encoding label from the subset of HTML internal + * encoding declaration syntax that uses the old long form with double quotes + * and without spaces around the equals sign between the "content" attribute + * name and the attribute value. + * + * This was added for the sake of an ancient version of StarOffice + * in the pre-UTF-8 era in bug 123389. It is unclear if supporting + * non-UTF-8 encodings is still necessary and if this function + * still needs to exist. + * + * As of December 2022, both Gecko and LibreOffice emit an UTF-8 + * declaration that this function successfully extracts "UTF-8" from, + * but that's also the default that we fall back on if this function + * fails to extract a label. + */ +bool GetHTMLCharset(Span<const char> aData, nsCString& aFoundCharset) { + // Assume ASCII first to find "charset" info + const nsDependentCSubstring htmlStr(aData); + nsACString::const_iterator start, end; + htmlStr.BeginReading(start); + htmlStr.EndReading(end); + nsACString::const_iterator valueStart(start), valueEnd(start); + + if (CaseInsensitiveFindInReadable("CONTENT=\"text/html;"_ns, start, end)) { + start = end; + htmlStr.EndReading(end); + + if (CaseInsensitiveFindInReadable("charset="_ns, start, end)) { + valueStart = end; + start = end; + htmlStr.EndReading(end); + + if (FindCharInReadable('"', start, end)) valueEnd = start; + } + } + // find "charset" in HTML + if (valueStart != valueEnd) { + aFoundCharset = Substring(valueStart, valueEnd); + ToUpperCase(aFoundCharset); + return true; + } + return false; +} |