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nsClipboard.cpp
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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* 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 "nsClipboard.h"
#include "nsSupportsPrimitives.h"
#include "nsString.h"
#include "nsReadableUtils.h"
#include "nsXPIDLString.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 "imgIContainer.h"
#include <gtk/gtk.h>
// For manipulation of the X event queue
#include <X11/Xlib.h>
#include <gdk/gdkx.h>
#include <sys/time.h>
#include <sys/types.h>
#include <errno.h>
#include <unistd.h>
#include "mozilla/dom/EncodingUtils.h"
#include "nsIUnicodeDecoder.h"
using mozilla::dom::EncodingUtils;
using namespace mozilla;
// 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 (guchar *data,
int32_t dataLength,
char16_t **unicodeData,
int32_t &outUnicodeLen);
static void
GetHTMLCharset (guchar * data, int32_t dataLength, nsCString& str);
// Our own versions of gtk_clipboard_wait_for_contents and
// gtk_clipboard_wait_for_text, which don't run the event loop while
// waiting for the data. This prevents a lot of problems related to
// dispatching events at unexpected times.
static GtkSelectionData *
wait_for_contents (GtkClipboard *clipboard, GdkAtom target);
static gchar *
wait_for_text (GtkClipboard *clipboard);
static GdkFilterReturn
selection_request_filter (GdkXEvent *gdk_xevent,
GdkEvent *event,
gpointer data);
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)
nsresult
nsClipboard::Init(void)
{
nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
if (!os)
return NS_ERROR_FAILURE;
os->AddObserver(this, "quit-application", false);
// A custom event filter to workaround attempting to dereference a null
// selection requestor in GTK3 versions before 3.11.3. See bug 1178799.
#if (MOZ_WIDGET_GTK == 3) && defined(MOZ_X11)
if (gtk_check_version(3, 11, 3))
gdk_window_add_filter(nullptr, selection_request_filter, nullptr);
#endif
return NS_OK;
}
NS_IMETHODIMP
nsClipboard::Observe(nsISupports *aSubject, const char *aTopic, const char16_t *aData)
{
if (strcmp(aTopic, "quit-application") == 0) {
// application is going to quit, save clipboard content
Store();
gdk_window_remove_filter(nullptr, selection_request_filter, nullptr);
}
return NS_OK;
}
nsresult
nsClipboard::Store(void)
{
// Ask the clipboard manager to store the current clipboard content
if (mGlobalTransferable) {
GtkClipboard *clipboard = gtk_clipboard_get(GDK_SELECTION_CLIPBOARD);
gtk_clipboard_store(clipboard);
}
return NS_OK;
}
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;
}
// Clear out the clipboard in order to set the new data
EmptyClipboard(aWhichClipboard);
// List of suported targets
GtkTargetList *list = gtk_target_list_new(nullptr, 0);
// Get the types of supported flavors
nsCOMPtr<nsISupportsArray> flavors;
nsresult rv =
aTransferable->FlavorsTransferableCanExport(getter_AddRefs(flavors));
if (!flavors || NS_FAILED(rv))
return NS_ERROR_FAILURE;
// Add all the flavors to this widget's supported type.
bool imagesAdded = false;
uint32_t count;
flavors->Count(&count);
for (uint32_t i=0; i < count; i++) {
nsCOMPtr<nsISupports> tastesLike;
flavors->GetElementAt(i, getter_AddRefs(tastesLike));
nsCOMPtr<nsISupportsCString> flavor = do_QueryInterface(tastesLike);
if (flavor) {
nsXPIDLCString flavorStr;
flavor->ToString(getter_Copies(flavorStr));
// special case text/unicode since we can handle all of
// the string types
if (!strcmp(flavorStr, kUnicodeMime)) {
gtk_target_list_add(list, gdk_atom_intern("UTF8_STRING", FALSE), 0, 0);
gtk_target_list_add(list, gdk_atom_intern("COMPOUND_TEXT", FALSE), 0, 0);
gtk_target_list_add(list, gdk_atom_intern("TEXT", FALSE), 0, 0);
gtk_target_list_add(list, GDK_SELECTION_TYPE_STRING, 0, 0);
continue;
}
if (flavorStr.EqualsLiteral(kNativeImageMime) ||
flavorStr.EqualsLiteral(kPNGImageMime) ||
flavorStr.EqualsLiteral(kJPEGImageMime) ||
flavorStr.EqualsLiteral(kJPGImageMime) ||
flavorStr.EqualsLiteral(kGIFImageMime)) {
// don't bother adding image targets twice
if (!imagesAdded) {
// accept any writable image type
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, 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);
// 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 {
rv = NS_ERROR_FAILURE;
}
gtk_target_table_free(gtkTargets, numTargets);
gtk_target_list_unref(list);
return rv;
}
NS_IMETHODIMP
nsClipboard::GetData(nsITransferable *aTransferable, int32_t aWhichClipboard)
{
if (!aTransferable)
return NS_ERROR_FAILURE;
GtkClipboard *clipboard;
clipboard = gtk_clipboard_get(GetSelectionAtom(aWhichClipboard));
guchar *data = nullptr;
gint length = 0;
bool foundData = false;
nsAutoCString foundFlavor;
// Get a list of flavors this transferable can import
nsCOMPtr<nsISupportsArray> flavors;
nsresult rv;
rv = aTransferable->FlavorsTransferableCanImport(getter_AddRefs(flavors));
if (!flavors || NS_FAILED(rv))
return NS_ERROR_FAILURE;
uint32_t count;
flavors->Count(&count);
for (uint32_t i=0; i < count; i++) {
nsCOMPtr<nsISupports> genericFlavor;
flavors->GetElementAt(i, getter_AddRefs(genericFlavor));
nsCOMPtr<nsISupportsCString> currentFlavor;
currentFlavor = do_QueryInterface(genericFlavor);
if (currentFlavor) {
nsXPIDLCString flavorStr;
currentFlavor->ToString(getter_Copies(flavorStr));
// Special case text/unicode since we can convert any
// string into text/unicode
if (!strcmp(flavorStr, kUnicodeMime)) {
gchar* new_text = wait_for_text(clipboard);
if (new_text) {
// Convert utf-8 into our unicode format.
NS_ConvertUTF8toUTF16 ucs2string(new_text);
data = (guchar *)ToNewUnicode(ucs2string);
length = ucs2string.Length() * 2;
g_free(new_text);
foundData = true;
foundFlavor = kUnicodeMime;
break;
}
// If the type was text/unicode and we couldn't get
// text off the clipboard, run the next loop
// iteration.
continue;
}
// For images, we must wrap the data in an nsIInputStream then return instead of break,
// because that code below won't help us.
if (!strcmp(flavorStr, kJPEGImageMime) ||
!strcmp(flavorStr, kJPGImageMime) ||
!strcmp(flavorStr, kPNGImageMime) ||
!strcmp(flavorStr, kGIFImageMime)) {
// Emulate support for image/jpg
if (!strcmp(flavorStr, kJPGImageMime)) {
flavorStr.Assign(kJPEGImageMime);
}
GdkAtom atom = gdk_atom_intern(flavorStr, FALSE);
GtkSelectionData *selectionData = wait_for_contents(clipboard, atom);
if (!selectionData)
continue;
nsCOMPtr<nsIInputStream> byteStream;
NS_NewByteInputStream(getter_AddRefs(byteStream),
(const char*)gtk_selection_data_get_data(selectionData),
gtk_selection_data_get_length(selectionData),
NS_ASSIGNMENT_COPY);
aTransferable->SetTransferData(flavorStr, byteStream, sizeof(nsIInputStream*));
gtk_selection_data_free(selectionData);
return NS_OK;
}
// Get the atom for this type and try to request it off
// the clipboard.
GdkAtom atom = gdk_atom_intern(flavorStr, FALSE);
GtkSelectionData *selectionData;
selectionData = wait_for_contents(clipboard, atom);
if (selectionData) {
const guchar *clipboardData = gtk_selection_data_get_data(selectionData);
length = gtk_selection_data_get_length(selectionData);
// Special case text/html since we can convert into UCS2
if (!strcmp(flavorStr, kHTMLMime)) {
char16_t* htmlBody= nullptr;
int32_t htmlBodyLen = 0;
// Convert text/html into our unicode format
ConvertHTMLtoUCS2(const_cast<guchar*>(clipboardData), length,
&htmlBody, htmlBodyLen);
// Try next data format?
if (!htmlBodyLen)
continue;
data = (guchar *)htmlBody;
length = htmlBodyLen * 2;
} else {
data = (guchar *)moz_xmalloc(length);
if (!data)
break;
memcpy(data, clipboardData, length);
}
gtk_selection_data_free(selectionData);
foundData = true;
foundFlavor = flavorStr;
break;
}
}
}
if (foundData) {
nsCOMPtr<nsISupports> wrapper;
nsPrimitiveHelpers::CreatePrimitiveForData(foundFlavor.get(),
data, length,
getter_AddRefs(wrapper));
aTransferable->SetTransferData(foundFlavor.get(),
wrapper, length);
}
if (data)
free(data);
return NS_OK;
}
NS_IMETHODIMP
nsClipboard::EmptyClipboard(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;
}
return NS_OK;
}
NS_IMETHODIMP
nsClipboard::HasDataMatchingFlavors(const char** aFlavorList, uint32_t aLength,
int32_t aWhichClipboard, bool *_retval)
{
if (!aFlavorList || !_retval)
return NS_ERROR_NULL_POINTER;
*_retval = false;
GtkSelectionData *selection_data =
GetTargets(GetSelectionAtom(aWhichClipboard));
if (!selection_data)
return NS_OK;
gint n_targets = 0;
GdkAtom *targets = nullptr;
if (!gtk_selection_data_get_targets(selection_data,
&targets, &n_targets) ||
!n_targets)
return NS_OK;
// Walk through the provided types and try to match it to a
// provided type.
for (uint32_t i = 0; i < aLength && !*_retval; i++) {
// We special case text/unicode here.
if (!strcmp(aFlavorList[i], kUnicodeMime) &&
gtk_selection_data_targets_include_text(selection_data)) {
*_retval = true;
break;
}
for (int32_t j = 0; j < n_targets; j++) {
gchar *atom_name = gdk_atom_name(targets[j]);
if (!atom_name)
continue;
if (!strcmp(atom_name, aFlavorList[i]))
*_retval = true;
// X clipboard supports image/jpeg, but we want to emulate support
// for image/jpg as well
if (!strcmp(aFlavorList[i], kJPGImageMime) && !strcmp(atom_name, kJPEGImageMime))
*_retval = true;
g_free(atom_name);
if (*_retval)
break;
}
}
gtk_selection_data_free(selection_data);
g_free(targets);
return NS_OK;
}
NS_IMETHODIMP
nsClipboard::SupportsSelectionClipboard(bool *_retval)
{
*_retval = true; // yeah, unix supports the selection clipboard
return NS_OK;
}
NS_IMETHODIMP
nsClipboard::SupportsFindClipboard(bool* _retval)
{
*_retval = false;
return NS_OK;
}
/* static */
GdkAtom
nsClipboard::GetSelectionAtom(int32_t aWhichClipboard)
{
if (aWhichClipboard == kGlobalClipboard)
return GDK_SELECTION_CLIPBOARD;
return GDK_SELECTION_PRIMARY;
}
/* static */
GtkSelectionData *
nsClipboard::GetTargets(GdkAtom aWhichClipboard)
{
GtkClipboard *clipboard = gtk_clipboard_get(aWhichClipboard);
return wait_for_contents(clipboard, gdk_atom_intern("TARGETS", FALSE));
}
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
nsCOMPtr<nsITransferable> trans = GetTransferable(whichClipboard);
if (!trans) {
// We have nothing to serve
#ifdef DEBUG_CLIPBOARD
printf("nsClipboard::SelectionGetEvent() - %s clipboard is empty!\n",
whichClipboard == kSelectionClipboard ? "Selection" : "Global");
#endif
return;
}
nsresult rv;
nsCOMPtr<nsISupports> item;
uint32_t len;
GdkAtom selectionTarget = gtk_selection_data_get_target(aSelectionData);
// Check to see if the selection data includes any of the string
// types that we support.
if (selectionTarget == gdk_atom_intern ("STRING", FALSE) ||
selectionTarget == gdk_atom_intern ("TEXT", FALSE) ||
selectionTarget == gdk_atom_intern ("COMPOUND_TEXT", FALSE) ||
selectionTarget == gdk_atom_intern ("UTF8_STRING", FALSE)) {
// 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),
&len);
if (!item || NS_FAILED(rv))
return;
nsCOMPtr<nsISupportsString> wideString;
wideString = do_QueryInterface(item);
if (!wideString)
return;
nsAutoString ucs2string;
wideString->GetData(ucs2string);
char *utf8string = ToNewUTF8String(ucs2string);
if (!utf8string)
return;
gtk_selection_data_set_text (aSelectionData, utf8string,
strlen(utf8string));
free(utf8string);
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<nsISupportsInterfacePointer> ptrPrimitive;
for (uint32_t i = 0; !ptrPrimitive && i < ArrayLength(imageMimeTypes); i++) {
rv = trans->GetTransferData(imageMimeTypes[i], getter_AddRefs(imageItem), &len);
ptrPrimitive = do_QueryInterface(imageItem);
}
if (!ptrPrimitive)
return;
nsCOMPtr<nsISupports> primitiveData;
ptrPrimitive->GetData(getter_AddRefs(primitiveData));
nsCOMPtr<imgIContainer> image(do_QueryInterface(primitiveData));
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;
}
// 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), &len);
// nothing found?
if (!item || NS_FAILED(rv)) {
g_free(target_name);
return;
}
void *primitive_data = nullptr;
nsPrimitiveHelpers::CreateDataFromPrimitive(target_name, item,
&primitive_data, len);
if (primitive_data) {
// Check to see if the selection data is text/html
if (selectionTarget == gdk_atom_intern (kHTMLMime, FALSE)) {
/*
* "text/html" can be encoded UCS2. It is recommended that
* documents transmitted as UCS2 always begin with a ZERO-WIDTH
* NON-BREAKING SPACE character (hexadecimal FEFF, also called
* Byte Order Mark (BOM)). Adding BOM can help other app to
* detect mozilla use UCS2 encoding when copy-paste.
*/
guchar *buffer = (guchar *)
moz_xmalloc((len * sizeof(guchar)) + sizeof(char16_t));
if (!buffer)
return;
char16_t prefix = 0xFEFF;
memcpy(buffer, &prefix, sizeof(prefix));
memcpy(buffer + sizeof(prefix), primitive_data, len);
free((guchar *)primitive_data);
primitive_data = (guchar *)buffer;
len += sizeof(prefix);
}
gtk_selection_data_set(aSelectionData, selectionTarget,
8, /* 8 bits in a unit */
(const guchar *)primitive_data, len);
free(primitive_data);
}
g_free(target_name);
}
void
nsClipboard::SelectionClearEvent(GtkClipboard *aGtkClipboard)
{
int32_t whichClipboard;
// which clipboard?
if (aGtkClipboard == gtk_clipboard_get(GDK_SELECTION_PRIMARY))
whichClipboard = kSelectionClipboard;
else if (aGtkClipboard == gtk_clipboard_get(GDK_SELECTION_CLIPBOARD))
whichClipboard = kGlobalClipboard;
else
return; // THAT AIN'T NO CLIPBOARD I EVER HEARD OF
EmptyClipboard(whichClipboard);
}
void
clipboard_get_cb(GtkClipboard *aGtkClipboard,
GtkSelectionData *aSelectionData,
guint info,
gpointer user_data)
{
nsClipboard *aClipboard = static_cast<nsClipboard *>(user_data);
aClipboard->SelectionGetEvent(aGtkClipboard, aSelectionData);
}
void
clipboard_clear_cb(GtkClipboard *aGtkClipboard,
gpointer user_data)
{
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(guchar * 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)));
if (*unicodeData) {
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
nsCOMPtr<nsIUnicodeDecoder> decoder;
// get the decoder
nsAutoCString encoding;
if (!EncodingUtils::FindEncodingForLabelNoReplacement(charset,
encoding)) {
#ifdef DEBUG_CLIPBOARD
g_print(" get unicode decoder error\n");
#endif
outUnicodeLen = 0;
return;
}
decoder = EncodingUtils::DecoderForEncoding(encoding);
// converting
nsresult rv = decoder->GetMaxLength((const char *)data, dataLength,
&outUnicodeLen);
if (NS_WARN_IF(NS_FAILED(rv))) {
outUnicodeLen = 0;
return;
}
// |outUnicodeLen| is number of chars
if (outUnicodeLen) {
*unicodeData = reinterpret_cast<char16_t*>
(moz_xmalloc((outUnicodeLen + sizeof('\0')) *
sizeof(char16_t)));
if (*unicodeData) {
int32_t numberTmp = dataLength;
decoder->Convert((const char *)data, &numberTmp,
*unicodeData, &outUnicodeLen);
#ifdef DEBUG_CLIPBOARD
if (numberTmp != dataLength)
printf("didn't consume all the bytes\n");
#endif
// null terminate. Convert() doesn't do it for us
(*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(guchar * 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 nsDependentCString htmlStr((const char *)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");
}
static void
DispatchSelectionNotifyEvent(GtkWidget *widget, XEvent *xevent)
{
GdkEvent event;
event.selection.type = GDK_SELECTION_NOTIFY;
event.selection.window = gtk_widget_get_window(widget);
event.selection.selection = gdk_x11_xatom_to_atom(xevent->xselection.selection);
event.selection.target = gdk_x11_xatom_to_atom(xevent->xselection.target);
event.selection.property = gdk_x11_xatom_to_atom(xevent->xselection.property);
event.selection.time = xevent->xselection.time;
gtk_widget_event(widget, &event);
}
static void
DispatchPropertyNotifyEvent(GtkWidget *widget, XEvent *xevent)
{
GdkWindow *window = gtk_widget_get_window(widget);
if ((gdk_window_get_events(window)) & GDK_PROPERTY_CHANGE_MASK) {
GdkEvent event;
event.property.type = GDK_PROPERTY_NOTIFY;
event.property.window = window;
event.property.atom = gdk_x11_xatom_to_atom(xevent->xproperty.atom);
event.property.time = xevent->xproperty.time;
event.property.state = xevent->xproperty.state;
gtk_widget_event(widget, &event);
}
}
struct checkEventContext
{
GtkWidget *cbWidget;
Atom selAtom;
};
static Bool
checkEventProc(Display *display, XEvent *event, XPointer arg)
{
checkEventContext *context = (checkEventContext *) arg;
if (event->xany.type == SelectionNotify ||
(event->xany.type == PropertyNotify &&
event->xproperty.atom == context->selAtom)) {
GdkWindow *cbWindow =
gdk_x11_window_lookup_for_display(gdk_x11_lookup_xdisplay(display),
event->xany.window);
if (cbWindow) {
GtkWidget *cbWidget = nullptr;
gdk_window_get_user_data(cbWindow, (gpointer *)&cbWidget);
if (cbWidget && GTK_IS_WIDGET(cbWidget)) {
context->cbWidget = cbWidget;
return True;
}
}
}
return False;
}
// Idle timeout for receiving selection and property notify events (microsec)
static const int kClipboardTimeout = 500000;
static gchar* CopyRetrievedData(const gchar *aData)
{
return g_strdup(aData);
}
static GtkSelectionData* CopyRetrievedData(GtkSelectionData *aData)
{
// A negative length indicates that retrieving the data failed.
return gtk_selection_data_get_length(aData) >= 0 ?
gtk_selection_data_copy(aData) : nullptr;
}
class RetrievalContext {
~RetrievalContext()
{
MOZ_ASSERT(!mData, "Wait() wasn't called");
}
public:
NS_INLINE_DECL_REFCOUNTING(RetrievalContext)
enum State { INITIAL, COMPLETED, TIMED_OUT };
RetrievalContext() : mState(INITIAL), mData(nullptr) {}
/**
* Call this when data has been retrieved.
*/
template <class T> void Complete(T *aData)
{
if (mState == INITIAL) {
mState = COMPLETED;
mData = CopyRetrievedData(aData);
} else {
// Already timed out
MOZ_ASSERT(mState == TIMED_OUT);
}
}
/**
* Spins X event loop until timing out or being completed. Returns
* null if we time out, otherwise returns the completed data (passing
* ownership to caller).
*/
void *Wait();
protected:
State mState;
void* mData;
};
void *
RetrievalContext::Wait()
{
if (mState == COMPLETED) { // the request completed synchronously
void *data = mData;
mData = nullptr;
return data;
}
GdkDisplay *gdkDisplay = gdk_display_get_default();
if (GDK_IS_X11_DISPLAY(gdkDisplay)) {
Display *xDisplay = GDK_DISPLAY_XDISPLAY(gdkDisplay);
checkEventContext context;
context.cbWidget = nullptr;
context.selAtom = gdk_x11_atom_to_xatom(gdk_atom_intern("GDK_SELECTION",
FALSE));
// Send X events which are relevant to the ongoing selection retrieval
// to the clipboard widget. Wait until either the operation completes, or
// we hit our timeout. All other X events remain queued.
int select_result;
int cnumber = ConnectionNumber(xDisplay);
fd_set select_set;
FD_ZERO(&select_set);
FD_SET(cnumber, &select_set);
++cnumber;
TimeStamp start = TimeStamp::Now();
do {
XEvent xevent;
while (XCheckIfEvent(xDisplay, &xevent, checkEventProc,
(XPointer) &context)) {
if (xevent.xany.type == SelectionNotify)
DispatchSelectionNotifyEvent(context.cbWidget, &xevent);
else
DispatchPropertyNotifyEvent(context.cbWidget, &xevent);
if (mState == COMPLETED) {
void *data = mData;
mData = nullptr;
return data;
}
}
TimeStamp now = TimeStamp::Now();
struct timeval tv;
tv.tv_sec = 0;
tv.tv_usec = std::max<int32_t>(0,
kClipboardTimeout - (now - start).ToMicroseconds());
select_result = select(cnumber, &select_set, nullptr, nullptr, &tv);
} while (select_result == 1 ||
(select_result == -1 && errno == EINTR));
}
#ifdef DEBUG_CLIPBOARD
printf("exceeded clipboard timeout\n");
#endif
mState = TIMED_OUT;
return nullptr;
}
static void
clipboard_contents_received(GtkClipboard *clipboard,
GtkSelectionData *selection_data,
gpointer data)
{
RetrievalContext *context = static_cast<RetrievalContext*>(data);
context->Complete(selection_data);
context->Release();
}
static GtkSelectionData *
wait_for_contents(GtkClipboard *clipboard, GdkAtom target)
{
RefPtr<RetrievalContext> context = new RetrievalContext();
// Balanced by Release in clipboard_contents_received