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gecko-dev
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gecko-dev/widget/gtk/nsClipboard.cpp

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24 KiB
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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:expandtab:shiftwidth=4:tabstop=4:
*/
/* 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"
#include "nsClipboardX11.h"
#if defined(MOZ_WAYLAND)
# include "nsClipboardWayland.h"
#endif
#include "nsContentUtils.h"
#include "HeadlessClipboard.h"
#include "nsSupportsPrimitives.h"
#include "nsString.h"
#include "nsReadableUtils.h"
#include "nsPrimitiveHelpers.h"
#include "nsIServiceManager.h"
#include "nsImageToPixbuf.h"
#include "nsStringStream.h"
#include "nsIObserverService.h"
#include "mozilla/Services.h"
#include "mozilla/RefPtr.h"
#include "mozilla/TimeStamp.h"
#include "gfxPlatformGtk.h"
#include "imgIContainer.h"
#include <gtk/gtk.h>
#include <gtk/gtkx.h>
#include "mozilla/Encoding.h"
using namespace mozilla;
// Idle timeout for receiving selection and property notify events (microsec)
const int kClipboardTimeout = 500000;
// 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">)";
// 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 void ConvertHTMLtoUCS2(const char* data, int32_t dataLength,
char16_t** unicodeData, int32_t& outUnicodeLen);
static void GetHTMLCharset(const char* data, int32_t dataLength,
nsCString& str);
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;
else
return -1; // THAT AIN'T NO CLIPBOARD I EVER HEARD OF
}
nsClipboard::nsClipboard() {}
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 (gfxPlatformGtk::GetPlatform()->IsX11Display()) {
mContext = new nsRetrievalContextX11();
#if defined(MOZ_WAYLAND)
} else {
mContext = new nsRetrievalContextWayland();
#endif
}
NS_ASSERTION(mContext, "Missing nsRetrievalContext for nsClipboard!");
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 SystemGroup::Dispatch(
TaskCategory::Other,
NS_NewRunnableFunction("gtk_clipboard_store()", []() {
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];
// Special case text/unicode since we can handle all of the string types.
if (flavorStr.EqualsLiteral(kUnicodeMime)) {
LOGCLIP((" 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((" image targets\n"));
gtk_target_list_add_image_targets(list, 0, TRUE);
imagesAdded = true;
}
continue;
}
// Add this to our list of valid targets
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;
GtkTargetEntry* gtkTargets =
gtk_target_table_new_from_list(list, &numTargets);
LOGCLIP((" gtk_target_table_new_from_list() = %p\n", (void*)gtkTargets));
// Set getcallback and request to store data after an application exit
if (gtkTargets &&
gtk_clipboard_set_with_data(gtkClipboard, gtkTargets, numTargets,
clipboard_get_cb, clipboard_clear_cb, this)) {
LOGCLIP((" gtk_clipboard_set_with_data() is ok\n"));
// 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"));
// Clear references to the any old data and let GTK know that it is no
// longer available.
EmptyClipboard(aWhichClipboard);
rv = NS_ERROR_FAILURE;
}
gtk_target_table_free(gtkTargets, numTargets);
gtk_target_list_unref(list);
return rv;
}
void nsClipboard::SetTransferableData(nsITransferable* aTransferable,
nsCString& aFlavor,
const char* aClipboardData,
uint32_t aClipboardDataLength) {
LOGCLIP(("nsClipboard::SetTransferableData MIME %s\n", aFlavor.get()));
nsCOMPtr<nsISupports> wrapper;
nsPrimitiveHelpers::CreatePrimitiveForData(
aFlavor, aClipboardData, aClipboardDataLength, getter_AddRefs(wrapper));
aTransferable->SetTransferData(aFlavor.get(), wrapper);
}
NS_IMETHODIMP
nsClipboard::GetData(nsITransferable* aTransferable, int32_t aWhichClipboard) {
if (!aTransferable) return NS_ERROR_FAILURE;
LOGCLIP(("nsClipboard::GetData (%s)\n",
aWhichClipboard == kSelectionClipboard ? "primary" : "clipboard"));
// Get a list of flavors this transferable can import
nsTArray<nsCString> flavors;
nsresult rv = aTransferable->FlavorsTransferableCanImport(flavors);
if (NS_FAILED(rv)) {
LOGCLIP((" FlavorsTransferableCanImport falied!\n"));
return rv;
}
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);
}
uint32_t clipboardDataLength;
const char* clipboardData = mContext->GetClipboardData(
flavorStr.get(), aWhichClipboard, &clipboardDataLength);
if (!clipboardData) {
LOGCLIP((" %s type is missing\n", flavorStr.get()));
continue;
}
nsCOMPtr<nsIInputStream> byteStream;
NS_NewByteInputStream(getter_AddRefs(byteStream),
MakeSpan(clipboardData, clipboardDataLength),
NS_ASSIGNMENT_COPY);
aTransferable->SetTransferData(flavorStr.get(), byteStream);
LOGCLIP((" got %s MIME data\n", flavorStr.get()));
mContext->ReleaseClipboardData(clipboardData);
return NS_OK;
}
// Special case text/unicode since we can convert any
// string into text/unicode
if (flavorStr.EqualsLiteral(kUnicodeMime)) {
const char* 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);
const char* unicodeData = (const char*)ToNewUnicode(ucs2string);
uint32_t unicodeDataLength = ucs2string.Length() * 2;
SetTransferableData(aTransferable, flavorStr, unicodeData,
unicodeDataLength);
free((void*)unicodeData);
LOGCLIP((" got unicode data, length %d\n", ucs2string.Length()));
mContext->ReleaseClipboardData(clipboardData);
return NS_OK;
}
uint32_t clipboardDataLength;
const char* clipboardData = mContext->GetClipboardData(
flavorStr.get(), aWhichClipboard, &clipboardDataLength);
#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)) {
char16_t* htmlBody = nullptr;
int32_t htmlBodyLen = 0;
// Convert text/html into our unicode format
ConvertHTMLtoUCS2(clipboardData, clipboardDataLength, &htmlBody,
htmlBodyLen);
// Try next data format?
if (!htmlBodyLen) {
mContext->ReleaseClipboardData(clipboardData);
continue;
}
SetTransferableData(aTransferable, flavorStr, (const char*)htmlBody,
htmlBodyLen * 2);
free(htmlBody);
} else {
SetTransferableData(aTransferable, flavorStr, clipboardData,
clipboardDataLength);
}
mContext->ReleaseClipboardData(clipboardData);
return NS_OK;
}
}
LOGCLIP((" failed to get clipboard content.\n"));
return NS_OK;
}
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);
}
}
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;
}
}
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;
int targetNums;
GdkAtom* targets = mContext->GetTargets(aWhichClipboard, &targetNums);
if (!targets) {
LOGCLIP((" no targes at clipboard (null)\n"));
return NS_OK;
}
// 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, targetNums)) {
*_retval = true;
LOGCLIP((" has kUnicodeMime\n"));
break;
}
for (int32_t j = 0; j < targetNums; j++) {
gchar* atom_name = gdk_atom_name(targets[j]);
if (!atom_name) continue;
if (flavor.Equals(atom_name)) {
*_retval = true;
LOGCLIP((" has %s\n", atom_name));
}
// X clipboard supports image/jpeg, but we want to emulate support
// for image/jpg as well
else if (flavor.EqualsLiteral(kJPGImageMime) &&
!strcmp(atom_name, kJPEGImageMime)) {
*_retval = true;
LOGCLIP((" has image/jpg\n"));
}
g_free(atom_name);
if (*_retval) break;
}
}
#ifdef MOZ_LOGGING
if (!(*_retval)) {
LOGCLIP((" no targes at clipboard (bad match)\n"));
}
#endif
g_free(targets);
return NS_OK;
}
NS_IMETHODIMP
nsClipboard::SupportsSelectionClipboard(bool* _retval) {
*_retval = mContext->HasSelectionSupport();
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);
// Check to see if the selection data is some text type.
if (gtk_targets_include_text(&selectionTarget, 1)) {
// 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) {
return;
}
nsCOMPtr<nsISupportsString> wideString;
wideString = do_QueryInterface(item);
if (!wideString) return;
nsAutoString ucs2string;
wideString->GetData(ucs2string);
NS_ConvertUTF16toUTF8 utf8string(ucs2string);
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)) {
// 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)) {
continue;
}
image = do_QueryInterface(imageItem);
if (image) {
break;
}
}
if (!image) { // Not getting an image for an image mime type!?
return;
}
GdkPixbuf* pixbuf = nsImageToPixbuf::ImageToPixbuf(image);
if (!pixbuf) return;
gtk_selection_data_set_pixbuf(aSelectionData, pixbuf);
g_object_unref(pixbuf);
return;
}
if (selectionTarget == gdk_atom_intern(kHTMLMime, FALSE)) {
rv = trans->GetTransferData(kHTMLMime, getter_AddRefs(item));
if (NS_FAILED(rv) || !item) {
return;
}
nsCOMPtr<nsISupportsString> wideString;
wideString = do_QueryInterface(item);
if (!wideString) {
return;
}
nsAutoString ucs2string;
wideString->GetData(ucs2string);
nsAutoCString html;
// Add the prefix so the encoding is correctly detected.
html.AppendLiteral(kHTMLMarkupPrefix);
AppendUTF16toUTF8(ucs2string, html);
gtk_selection_data_set(aSelectionData, selectionTarget, 8,
(const guchar*)html.get(), html.Length());
return;
}
// Try to match up the selection data target to something our
// transferable provides.
gchar* target_name = gdk_atom_name(selectionTarget);
if (!target_name) return;
rv = trans->GetTransferData(target_name, getter_AddRefs(item));
// nothing found?
if (NS_FAILED(rv) || !item) {
g_free(target_name);
return;
}
void* primitive_data = nullptr;
uint32_t dataLen = 0;
nsPrimitiveHelpers::CreateDataFromPrimitive(nsDependentCString(target_name),
item, &primitive_data, &dataLen);
if (primitive_data) {
gtk_selection_data_set(aSelectionData, selectionTarget,
8, /* 8 bits in a unit */
(const guchar*)primitive_data, dataLen);
free(primitive_data);
}
g_free(target_name);
}
void nsClipboard::SelectionClearEvent(GtkClipboard* aGtkClipboard) {
int32_t whichClipboard = GetGeckoClipboardType(aGtkClipboard);
if (whichClipboard < 0) {
return;
}
LOGCLIP(("nsClipboard::SelectionClearEvent (%s)\n",
whichClipboard == kSelectionClipboard ? "primary" : "clipboard"));
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);
}
/*
* when copy-paste, mozilla wants data encoded using UCS2,
* other app such as StarOffice use "text/html"(RFC2854).
* This function convert data(got from GTK clipboard)
* to data mozilla wanted.
*
* data from GTK clipboard can be 3 forms:
* 1. From current mozilla
* "text/html", charset = utf-16
* 2. From old version mozilla or mozilla-based app
* content("body" only), charset = utf-16
* 3. From other app who use "text/html" when copy-paste
* "text/html", has "charset" info
*
* data : got from GTK clipboard
* dataLength: got from GTK clipboard
* body : pass to Mozilla
* bodyLength: pass to Mozilla
*/
void ConvertHTMLtoUCS2(const char* data, int32_t dataLength,
char16_t** unicodeData, int32_t& outUnicodeLen) {
nsAutoCString charset;
GetHTMLCharset(data, dataLength, charset); // get charset of HTML
if (charset.EqualsLiteral("UTF-16")) { // current mozilla
outUnicodeLen = (dataLength / 2) - 1;
*unicodeData = reinterpret_cast<char16_t*>(
moz_xmalloc((outUnicodeLen + sizeof('\0')) * sizeof(char16_t)));
memcpy(*unicodeData, data + sizeof(char16_t),
outUnicodeLen * sizeof(char16_t));
(*unicodeData)[outUnicodeLen] = '\0';
} else if (charset.EqualsLiteral("UNKNOWN")) {
outUnicodeLen = 0;
return;
} else {
// app which use "text/html" to copy&paste
// get the decoder
auto encoding = Encoding::ForLabelNoReplacement(charset);
if (!encoding) {
#ifdef DEBUG_CLIPBOARD
g_print(" get unicode decoder error\n");
#endif
outUnicodeLen = 0;
return;
}
auto dataSpan = MakeSpan(data, dataLength);
// Remove kHTMLMarkupPrefix again, it won't necessarily cause any
// issues, but might confuse other users.
const size_t prefixLen = ArrayLength(kHTMLMarkupPrefix) - 1;
if (dataSpan.Length() >= prefixLen &&
Substring(data, prefixLen).EqualsLiteral(kHTMLMarkupPrefix)) {
dataSpan = dataSpan.From(prefixLen);
}
auto decoder = encoding->NewDecoder();
CheckedInt<size_t> needed =
decoder->MaxUTF16BufferLength(dataSpan.Length());
if (!needed.isValid() || needed.value() > INT32_MAX) {
outUnicodeLen = 0;
return;
}
outUnicodeLen = 0;
if (needed.value()) {
*unicodeData = reinterpret_cast<char16_t*>(
moz_xmalloc((needed.value() + 1) * sizeof(char16_t)));
uint32_t result;
size_t read;
size_t written;
bool hadErrors;
Tie(result, read, written, hadErrors) = decoder->DecodeToUTF16(
AsBytes(dataSpan), MakeSpan(*unicodeData, needed.value()), true);
MOZ_ASSERT(result == kInputEmpty);
MOZ_ASSERT(read == size_t(dataSpan.Length()));
MOZ_ASSERT(written <= needed.value());
Unused << hadErrors;
outUnicodeLen = written;
// null terminate.
(*unicodeData)[outUnicodeLen] = '\0';
} // if valid length
}
}
/*
* get "charset" information from clipboard data
* return value can be:
* 1. "UTF-16": mozilla or "text/html" with "charset=utf-16"
* 2. "UNKNOWN": mozilla can't detect what encode it use
* 3. other: "text/html" with other charset than utf-16
*/
void GetHTMLCharset(const char* data, int32_t dataLength, nsCString& str) {
// if detect "FFFE" or "FEFF", assume UTF-16
char16_t* beginChar = (char16_t*)data;
if ((beginChar[0] == 0xFFFE) || (beginChar[0] == 0xFEFF)) {
str.AssignLiteral("UTF-16");
return;
}
// no "FFFE" and "FEFF", assume ASCII first to find "charset" info
const nsDependentCSubstring htmlStr(data, dataLength);
nsACString::const_iterator start, end;
htmlStr.BeginReading(start);
htmlStr.EndReading(end);
nsACString::const_iterator valueStart(start), valueEnd(start);
if (CaseInsensitiveFindInReadable(NS_LITERAL_CSTRING("CONTENT=\"text/html;"),
start, end)) {
start = end;
htmlStr.EndReading(end);
if (CaseInsensitiveFindInReadable(NS_LITERAL_CSTRING("charset="), start,
end)) {
valueStart = end;
start = end;
htmlStr.EndReading(end);
if (FindCharInReadable('"', start, end)) valueEnd = start;
}
}
// find "charset" in HTML
if (valueStart != valueEnd) {
str = Substring(valueStart, valueEnd);
ToUpperCase(str);
#ifdef DEBUG_CLIPBOARD
printf("Charset of HTML = %s\n", charsetUpperStr.get());
#endif
return;
}
str.AssignLiteral("UNKNOWN");
}
Ссылка в новой задаче Показать git blame Копировать постоянную ссылку