From 36d22d82aa202bb199967e9512281e9a53db42c9 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 21:33:14 +0200
Subject: Adding upstream version 115.7.0esr.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 widget/cocoa/nsClipboard.mm | 776 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 776 insertions(+)
 create mode 100644 widget/cocoa/nsClipboard.mm

(limited to 'widget/cocoa/nsClipboard.mm')

diff --git a/widget/cocoa/nsClipboard.mm b/widget/cocoa/nsClipboard.mm
new file mode 100644
index 0000000000..0d1c7c688b
--- /dev/null
+++ b/widget/cocoa/nsClipboard.mm
@@ -0,0 +1,776 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 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 <algorithm>
+
+#include "mozilla/gfx/2D.h"
+#include "mozilla/Logging.h"
+#include "mozilla/Unused.h"
+
+#include "gfxPlatform.h"
+#include "nsArrayUtils.h"
+#include "nsCOMPtr.h"
+#include "nsClipboard.h"
+#include "nsString.h"
+#include "nsISupportsPrimitives.h"
+#include "nsPrimitiveHelpers.h"
+#include "nsIFile.h"
+#include "nsStringStream.h"
+#include "nsEscape.h"
+#include "nsPrintfCString.h"
+#include "nsObjCExceptions.h"
+#include "imgIContainer.h"
+#include "nsCocoaUtils.h"
+
+using mozilla::LogLevel;
+using mozilla::gfx::DataSourceSurface;
+using mozilla::gfx::SourceSurface;
+
+mozilla::StaticRefPtr<nsITransferable> nsClipboard::sSelectionCache;
+
+nsClipboard::nsClipboard()
+    : nsBaseClipboard(mozilla::dom::ClipboardCapabilities(false /* supportsSelectionClipboard */,
+                                                          true /* supportsFindClipboard */,
+                                                          true /* supportsSelectionCache */)) {}
+
+nsClipboard::~nsClipboard() { ClearSelectionCache(); }
+
+NS_IMPL_ISUPPORTS_INHERITED0(nsClipboard, nsBaseClipboard)
+
+namespace {
+
+// We separate this into its own function because after an @try, all local
+// variables within that function get marked as volatile, and our C++ type
+// system doesn't like volatile things.
+static NSData* GetDataFromPasteboard(NSPasteboard* aPasteboard, NSString* aType) {
+  NSData* data = nil;
+  @try {
+    data = [aPasteboard dataForType:aType];
+  } @catch (NSException* e) {
+    NS_WARNING(
+        nsPrintfCString("Exception raised while getting data from the pasteboard: \"%s - %s\"",
+                        [[e name] UTF8String], [[e reason] UTF8String])
+            .get());
+    mozilla::Unused << e;
+  }
+  return data;
+}
+
+static NSPasteboard* GetPasteboard(int32_t aWhichClipboard) {
+  switch (aWhichClipboard) {
+    case nsIClipboard::kGlobalClipboard:
+      return [NSPasteboard generalPasteboard];
+    case nsIClipboard::kFindClipboard:
+      if (@available(macOS 10.13, *)) {
+        return [NSPasteboard pasteboardWithName:NSPasteboardNameFind];
+      }
+      return [NSPasteboard pasteboardWithName:NSFindPboard];
+    default:
+      return nil;
+  }
+}
+
+}  // namespace
+
+void nsClipboard::SetSelectionCache(nsITransferable* aTransferable) {
+  sSelectionCache = aTransferable;
+}
+
+void nsClipboard::ClearSelectionCache() { sSelectionCache = nullptr; }
+
+NS_IMETHODIMP
+nsClipboard::SetNativeClipboardData(nsITransferable* aTransferable, nsIClipboardOwner* aOwner,
+                                    int32_t aWhichClipboard) {
+  NS_OBJC_BEGIN_TRY_BLOCK_RETURN;
+
+  MOZ_ASSERT(aTransferable);
+  MOZ_ASSERT(nsIClipboard::IsClipboardTypeSupported(aWhichClipboard));
+
+  if (aWhichClipboard == kSelectionCache) {
+    SetSelectionCache(aTransferable);
+    return NS_OK;
+  }
+
+  NSDictionary* pasteboardOutputDict = PasteboardDictFromTransferable(aTransferable);
+  if (!pasteboardOutputDict) return NS_ERROR_FAILURE;
+
+  unsigned int outputCount = [pasteboardOutputDict count];
+  NSArray* outputKeys = [pasteboardOutputDict allKeys];
+  NSPasteboard* cocoaPasteboard = GetPasteboard(aWhichClipboard);
+  MOZ_ASSERT(cocoaPasteboard);
+  if (aWhichClipboard == kFindClipboard) {
+    NSString* stringType = [UTIHelper stringFromPboardType:NSPasteboardTypeString];
+    [cocoaPasteboard declareTypes:[NSArray arrayWithObject:stringType] owner:nil];
+  } else {
+    // Write everything else out to the general pasteboard.
+    MOZ_ASSERT(aWhichClipboard == kGlobalClipboard);
+    [cocoaPasteboard declareTypes:outputKeys owner:nil];
+  }
+
+  for (unsigned int i = 0; i < outputCount; i++) {
+    NSString* currentKey = [outputKeys objectAtIndex:i];
+    id currentValue = [pasteboardOutputDict valueForKey:currentKey];
+    if (aWhichClipboard == kFindClipboard) {
+      if ([currentKey isEqualToString:[UTIHelper stringFromPboardType:NSPasteboardTypeString]]) {
+        [cocoaPasteboard setString:currentValue forType:currentKey];
+      }
+    } else {
+      if ([currentKey isEqualToString:[UTIHelper stringFromPboardType:NSPasteboardTypeString]] ||
+          [currentKey isEqualToString:[UTIHelper stringFromPboardType:kPublicUrlPboardType]] ||
+          [currentKey isEqualToString:[UTIHelper stringFromPboardType:kPublicUrlNamePboardType]]) {
+        [cocoaPasteboard setString:currentValue forType:currentKey];
+      } else if ([currentKey
+                     isEqualToString:[UTIHelper stringFromPboardType:kUrlsWithTitlesPboardType]]) {
+        [cocoaPasteboard setPropertyList:[pasteboardOutputDict valueForKey:currentKey]
+                                 forType:currentKey];
+      } else if ([currentKey
+                     isEqualToString:[UTIHelper stringFromPboardType:NSPasteboardTypeHTML]]) {
+        [cocoaPasteboard setString:(nsClipboard::WrapHtmlForSystemPasteboard(currentValue))
+                           forType:currentKey];
+      } else if ([currentKey
+                     isEqualToString:[UTIHelper stringFromPboardType:kMozFileUrlsPboardType]]) {
+        [cocoaPasteboard writeObjects:currentValue];
+      } else if ([currentKey
+                     isEqualToString:[UTIHelper stringFromPboardType:(NSString*)kUTTypeFileURL]]) {
+        [cocoaPasteboard setString:currentValue forType:currentKey];
+      } else {
+        [cocoaPasteboard setData:currentValue forType:currentKey];
+      }
+    }
+  }
+
+  mCachedClipboard = aWhichClipboard;
+  mChangeCount = [cocoaPasteboard changeCount];
+
+  return NS_OK;
+
+  NS_OBJC_END_TRY_BLOCK_RETURN(NS_ERROR_FAILURE);
+}
+
+nsresult nsClipboard::TransferableFromPasteboard(nsITransferable* aTransferable,
+                                                 NSPasteboard* cocoaPasteboard) {
+  NS_OBJC_BEGIN_TRY_BLOCK_RETURN;
+
+  // get flavor list that includes all acceptable flavors (including ones obtained through
+  // conversion)
+  nsTArray<nsCString> flavors;
+  nsresult rv = aTransferable->FlavorsTransferableCanImport(flavors);
+  if (NS_FAILED(rv)) return NS_ERROR_FAILURE;
+
+  for (uint32_t i = 0; i < flavors.Length(); i++) {
+    nsCString& flavorStr = flavors[i];
+
+    // printf("looking for clipboard data of type %s\n", flavorStr.get());
+
+    NSString* pboardType = nil;
+    if (nsClipboard::IsStringType(flavorStr, &pboardType)) {
+      NSString* pString = [cocoaPasteboard stringForType:pboardType];
+      if (!pString) {
+        continue;
+      }
+
+      NSData* stringData;
+      bool isRTF =
+          [pboardType isEqualToString:[UTIHelper stringFromPboardType:NSPasteboardTypeRTF]];
+      if (isRTF) {
+        stringData = [pString dataUsingEncoding:NSASCIIStringEncoding];
+      } else {
+        stringData = [pString dataUsingEncoding:NSUnicodeStringEncoding];
+      }
+      unsigned int dataLength = [stringData length];
+      void* clipboardDataPtr = malloc(dataLength);
+      if (!clipboardDataPtr) {
+        return NS_ERROR_OUT_OF_MEMORY;
+      }
+      [stringData getBytes:clipboardDataPtr length:dataLength];
+
+      // The DOM only wants LF, so convert from MacOS line endings to DOM line endings.
+      int32_t signedDataLength = dataLength;
+      nsLinebreakHelpers::ConvertPlatformToDOMLinebreaks(isRTF, &clipboardDataPtr,
+                                                         &signedDataLength);
+      dataLength = signedDataLength;
+
+      // skip BOM (Byte Order Mark to distinguish little or big endian)
+      char16_t* clipboardDataPtrNoBOM = (char16_t*)clipboardDataPtr;
+      if ((dataLength > 2) &&
+          ((clipboardDataPtrNoBOM[0] == 0xFEFF) || (clipboardDataPtrNoBOM[0] == 0xFFFE))) {
+        dataLength -= sizeof(char16_t);
+        clipboardDataPtrNoBOM += 1;
+      }
+
+      nsCOMPtr<nsISupports> genericDataWrapper;
+      nsPrimitiveHelpers::CreatePrimitiveForData(flavorStr, clipboardDataPtrNoBOM, dataLength,
+                                                 getter_AddRefs(genericDataWrapper));
+      aTransferable->SetTransferData(flavorStr.get(), genericDataWrapper);
+      free(clipboardDataPtr);
+      break;
+    } else if (flavorStr.EqualsLiteral(kFileMime)) {
+      NSArray* items = [cocoaPasteboard pasteboardItems];
+      if (!items || [items count] <= 0) {
+        continue;
+      }
+
+      // XXX we don't support multiple clipboard item on DOM and XPCOM interface
+      // for now, so we only get the data from the first pasteboard item.
+      NSPasteboardItem* item = [items objectAtIndex:0];
+      if (!item) {
+        continue;
+      }
+
+      nsCocoaUtils::SetTransferDataForTypeFromPasteboardItem(aTransferable, flavorStr, item);
+    } else if (flavorStr.EqualsLiteral(kCustomTypesMime)) {
+      NSString* type = [cocoaPasteboard
+          availableTypeFromArray:
+              [NSArray arrayWithObject:[UTIHelper stringFromPboardType:kMozCustomTypesPboardType]]];
+      if (!type) {
+        continue;
+      }
+
+      NSData* pasteboardData = GetDataFromPasteboard(cocoaPasteboard, type);
+      if (!pasteboardData) {
+        continue;
+      }
+
+      unsigned int dataLength = [pasteboardData length];
+      void* clipboardDataPtr = malloc(dataLength);
+      if (!clipboardDataPtr) {
+        return NS_ERROR_OUT_OF_MEMORY;
+      }
+      [pasteboardData getBytes:clipboardDataPtr length:dataLength];
+
+      nsCOMPtr<nsISupports> genericDataWrapper;
+      nsPrimitiveHelpers::CreatePrimitiveForData(flavorStr, clipboardDataPtr, dataLength,
+                                                 getter_AddRefs(genericDataWrapper));
+
+      aTransferable->SetTransferData(flavorStr.get(), genericDataWrapper);
+      free(clipboardDataPtr);
+    } else if (flavorStr.EqualsLiteral(kJPEGImageMime) || flavorStr.EqualsLiteral(kJPGImageMime) ||
+               flavorStr.EqualsLiteral(kPNGImageMime) || flavorStr.EqualsLiteral(kGIFImageMime)) {
+      // Figure out if there's data on the pasteboard we can grab (sanity check)
+      NSString* type = [cocoaPasteboard
+          availableTypeFromArray:
+              [NSArray arrayWithObjects:[UTIHelper stringFromPboardType:(NSString*)kUTTypeFileURL],
+                                        [UTIHelper stringFromPboardType:NSPasteboardTypeTIFF],
+                                        [UTIHelper stringFromPboardType:NSPasteboardTypePNG], nil]];
+      if (!type) continue;
+
+      // Read data off the clipboard
+      NSData* pasteboardData = GetDataFromPasteboard(cocoaPasteboard, type);
+      if (!pasteboardData) continue;
+
+      // Figure out what type we're converting to
+      CFStringRef outputType = NULL;
+      if (flavorStr.EqualsLiteral(kJPEGImageMime) || flavorStr.EqualsLiteral(kJPGImageMime))
+        outputType = CFSTR("public.jpeg");
+      else if (flavorStr.EqualsLiteral(kPNGImageMime))
+        outputType = CFSTR("public.png");
+      else if (flavorStr.EqualsLiteral(kGIFImageMime))
+        outputType = CFSTR("com.compuserve.gif");
+      else
+        continue;
+
+      // Use ImageIO to interpret the data on the clipboard and transcode.
+      // Note that ImageIO, like all CF APIs, allows NULLs to propagate freely
+      // and safely in most cases (like ObjC). A notable exception is CFRelease.
+      NSDictionary* options = [NSDictionary
+          dictionaryWithObjectsAndKeys:(NSNumber*)kCFBooleanTrue, kCGImageSourceShouldAllowFloat,
+                                       type, kCGImageSourceTypeIdentifierHint, nil];
+      CGImageSourceRef source = nullptr;
+      if (type == [UTIHelper stringFromPboardType:(NSString*)kUTTypeFileURL]) {
+        NSString* urlStr = [cocoaPasteboard stringForType:type];
+        NSURL* url = [NSURL URLWithString:urlStr];
+        source = CGImageSourceCreateWithURL((CFURLRef)url, (CFDictionaryRef)options);
+      } else {
+        source = CGImageSourceCreateWithData((CFDataRef)pasteboardData, (CFDictionaryRef)options);
+      }
+
+      NSMutableData* encodedData = [NSMutableData data];
+      CGImageDestinationRef dest =
+          CGImageDestinationCreateWithData((CFMutableDataRef)encodedData, outputType, 1, NULL);
+      CGImageDestinationAddImageFromSource(dest, source, 0, NULL);
+      bool successfullyConverted = CGImageDestinationFinalize(dest);
+
+      if (successfullyConverted) {
+        // Put the converted data in a form Gecko can understand
+        nsCOMPtr<nsIInputStream> byteStream;
+        NS_NewByteInputStream(getter_AddRefs(byteStream),
+                              mozilla::Span((const char*)[encodedData bytes], [encodedData length]),
+                              NS_ASSIGNMENT_COPY);
+
+        aTransferable->SetTransferData(flavorStr.get(), byteStream);
+      }
+
+      if (dest) CFRelease(dest);
+      if (source) CFRelease(source);
+
+      if (successfullyConverted)
+        break;
+      else
+        continue;
+    }
+  }
+
+  return NS_OK;
+
+  NS_OBJC_END_TRY_BLOCK_RETURN(NS_ERROR_FAILURE);
+}
+
+NS_IMETHODIMP
+nsClipboard::GetNativeClipboardData(nsITransferable* aTransferable, int32_t aWhichClipboard) {
+  NS_OBJC_BEGIN_TRY_BLOCK_RETURN;
+
+  if ((aWhichClipboard != kGlobalClipboard && aWhichClipboard != kFindClipboard) || !aTransferable)
+    return NS_ERROR_FAILURE;
+
+  NSPasteboard* cocoaPasteboard = GetPasteboard(aWhichClipboard);
+  if (!cocoaPasteboard) {
+    return NS_ERROR_FAILURE;
+  }
+
+  // get flavor list that includes all acceptable flavors (including ones obtained through
+  // conversion)
+  nsTArray<nsCString> flavors;
+  nsresult rv = aTransferable->FlavorsTransferableCanImport(flavors);
+  if (NS_FAILED(rv)) return NS_ERROR_FAILURE;
+
+  // If we were the last ones to put something on the pasteboard, then just use the cached
+  // transferable. Otherwise clear it because it isn't relevant any more.
+  if (mCachedClipboard == aWhichClipboard) {
+    const auto& clipboardCache = mCaches[aWhichClipboard];
+    MOZ_ASSERT(clipboardCache);
+    if (mChangeCount == [cocoaPasteboard changeCount]) {
+      if (nsITransferable* cachedTrans = clipboardCache->GetTransferable()) {
+        for (uint32_t i = 0; i < flavors.Length(); i++) {
+          nsCString& flavorStr = flavors[i];
+
+          nsCOMPtr<nsISupports> dataSupports;
+          rv = cachedTrans->GetTransferData(flavorStr.get(), getter_AddRefs(dataSupports));
+          if (NS_SUCCEEDED(rv)) {
+            aTransferable->SetTransferData(flavorStr.get(), dataSupports);
+            return NS_OK;  // maybe try to fill in more types? Is there a point?
+          }
+        }
+      }
+    } else {
+      // Remove transferable cache only. Don't clear system clipboard.
+      clipboardCache->Clear();
+    }
+  }
+
+  // at this point we can't satisfy the request from cache data so let's look
+  // for things other people put on the system clipboard
+
+  return nsClipboard::TransferableFromPasteboard(aTransferable, cocoaPasteboard);
+
+  NS_OBJC_END_TRY_BLOCK_RETURN(NS_ERROR_FAILURE);
+}
+
+// returns true if we have *any* of the passed in flavors available for pasting
+NS_IMETHODIMP
+nsClipboard::HasDataMatchingFlavors(const nsTArray<nsCString>& aFlavorList, int32_t aWhichClipboard,
+                                    bool* outResult) {
+  NS_OBJC_BEGIN_TRY_BLOCK_RETURN;
+
+  CLIPBOARD_LOG("%s: clipboard=%i", __FUNCTION__, aWhichClipboard);
+  CLIPBOARD_LOG("    Asking for content:\n");
+  for (auto& flavor : aFlavorList) {
+    CLIPBOARD_LOG("        MIME %s\n", flavor.get());
+  }
+
+  *outResult = false;
+
+  // We only support the set operation on kSelectionCache type, see bug 1835059.
+  if ((aWhichClipboard != kGlobalClipboard && aWhichClipboard != kFindClipboard)) {
+    return NS_OK;
+  }
+
+  NSPasteboard* cocoaPasteboard = GetPasteboard(aWhichClipboard);
+  MOZ_ASSERT(cocoaPasteboard);
+  if (mCachedClipboard == aWhichClipboard) {
+    const auto& clipboardCache = mCaches[mCachedClipboard];
+    MOZ_ASSERT(clipboardCache);
+    if (mChangeCount != [cocoaPasteboard changeCount]) {
+      // Clear the cached transferable as it is no longer valid.
+      clipboardCache->Clear();
+    } else if (nsITransferable* cachedTrans = clipboardCache->GetTransferable()) {
+      // See if we have data for this in our cached transferable.
+      nsTArray<nsCString> flavors;
+      nsresult rv = cachedTrans->FlavorsTransferableCanImport(flavors);
+      if (NS_SUCCEEDED(rv)) {
+        if (CLIPBOARD_LOG_ENABLED()) {
+          CLIPBOARD_LOG("    Cached transferable types (nums %zu)\n", flavors.Length());
+          for (uint32_t j = 0; j < flavors.Length(); j++) {
+            CLIPBOARD_LOG("        MIME %s\n", flavors[j].get());
+          }
+        }
+
+        for (uint32_t j = 0; j < flavors.Length(); j++) {
+          const nsCString& transferableFlavorStr = flavors[j];
+
+          for (uint32_t k = 0; k < aFlavorList.Length(); k++) {
+            if (transferableFlavorStr.Equals(aFlavorList[k])) {
+              CLIPBOARD_LOG("    has %s\n", aFlavorList[k].get());
+              *outResult = true;
+              return NS_OK;
+            }
+          }
+        }
+      }
+    }
+  }
+
+  if (CLIPBOARD_LOG_ENABLED()) {
+    NSArray* types = [cocoaPasteboard types];
+    uint32_t count = [types count];
+    CLIPBOARD_LOG("    Pasteboard types (nums %d)\n", count);
+    for (uint32_t i = 0; i < count; i++) {
+      NSPasteboardType type = [types objectAtIndex:i];
+      if (!type) {
+        CLIPBOARD_LOG("        failed to get MIME\n");
+        continue;
+      }
+      CLIPBOARD_LOG("        MIME %s\n", [type UTF8String]);
+    }
+  }
+
+  for (auto& mimeType : aFlavorList) {
+    NSString* pboardType = nil;
+    if (nsClipboard::IsStringType(mimeType, &pboardType)) {
+      NSString* availableType =
+          [cocoaPasteboard availableTypeFromArray:[NSArray arrayWithObject:pboardType]];
+      if (availableType && [availableType isEqualToString:pboardType]) {
+        CLIPBOARD_LOG("    has %s\n", mimeType.get());
+        *outResult = true;
+        break;
+      }
+    } else if (mimeType.EqualsLiteral(kCustomTypesMime)) {
+      NSString* availableType = [cocoaPasteboard
+          availableTypeFromArray:
+              [NSArray arrayWithObject:[UTIHelper stringFromPboardType:kMozCustomTypesPboardType]]];
+      if (availableType) {
+        CLIPBOARD_LOG("    has %s\n", mimeType.get());
+        *outResult = true;
+        break;
+      }
+    } else if (mimeType.EqualsLiteral(kJPEGImageMime) || mimeType.EqualsLiteral(kJPGImageMime) ||
+               mimeType.EqualsLiteral(kPNGImageMime) || mimeType.EqualsLiteral(kGIFImageMime)) {
+      NSString* availableType = [cocoaPasteboard
+          availableTypeFromArray:
+              [NSArray arrayWithObjects:[UTIHelper stringFromPboardType:NSPasteboardTypeTIFF],
+                                        [UTIHelper stringFromPboardType:NSPasteboardTypePNG], nil]];
+      if (availableType) {
+        CLIPBOARD_LOG("    has %s\n", mimeType.get());
+        *outResult = true;
+        break;
+      }
+    } else if (mimeType.EqualsLiteral(kFileMime)) {
+      NSArray* items = [cocoaPasteboard pasteboardItems];
+      if (items && [items count] > 0) {
+        // XXX we only check the first pasteboard item as we only get data from
+        // first item in TransferableFromPasteboard for now.
+        if (NSPasteboardItem* item = [items objectAtIndex:0]) {
+          if (NSString *availableType = [item
+                  availableTypeFromArray:
+                      [NSArray arrayWithObjects:[UTIHelper
+                                                    stringFromPboardType:(NSString*)kUTTypeFileURL],
+                                                nil]]) {
+            CLIPBOARD_LOG("    has %s\n", mimeType.get());
+            *outResult = true;
+            break;
+          }
+        }
+      }
+    }
+  }
+
+  if (CLIPBOARD_LOG_ENABLED() && !(*outResult)) {
+    CLIPBOARD_LOG("    no targets at clipboard (bad match)\n");
+  }
+
+  return NS_OK;
+
+  NS_OBJC_END_TRY_BLOCK_RETURN(NS_ERROR_FAILURE);
+}
+
+// static
+mozilla::Maybe<uint32_t> nsClipboard::FindIndexOfImageFlavor(
+    const nsTArray<nsCString>& aMIMETypes) {
+  for (uint32_t i = 0; i < aMIMETypes.Length(); ++i) {
+    if (nsClipboard::IsImageType(aMIMETypes[i])) {
+      return mozilla::Some(i);
+    }
+  }
+
+  return mozilla::Nothing();
+}
+
+// This function converts anything that other applications might understand into the system format
+// and puts it into a dictionary which it returns.
+// static
+NSDictionary* nsClipboard::PasteboardDictFromTransferable(nsITransferable* aTransferable) {
+  NS_OBJC_BEGIN_TRY_BLOCK_RETURN;
+
+  if (!aTransferable) {
+    return nil;
+  }
+
+  NSMutableDictionary* pasteboardOutputDict = [NSMutableDictionary dictionary];
+
+  nsTArray<nsCString> flavors;
+  nsresult rv = aTransferable->FlavorsTransferableCanExport(flavors);
+  if (NS_FAILED(rv)) {
+    return nil;
+  }
+
+  const mozilla::Maybe<uint32_t> imageFlavorIndex = nsClipboard::FindIndexOfImageFlavor(flavors);
+
+  if (imageFlavorIndex) {
+    // When right-clicking and "Copy Image" is clicked on macOS, some apps expect the
+    // first flavor to be the image flavor. See bug 1689992. For other apps, the
+    // order shouldn't matter.
+    std::swap(*flavors.begin(), flavors[*imageFlavorIndex]);
+  }
+  for (uint32_t i = 0; i < flavors.Length(); i++) {
+    nsCString& flavorStr = flavors[i];
+
+    CLIPBOARD_LOG("writing out clipboard data of type %s (%d)\n", flavorStr.get(), i);
+
+    NSString* pboardType = nil;
+    if (nsClipboard::IsStringType(flavorStr, &pboardType)) {
+      nsCOMPtr<nsISupports> genericDataWrapper;
+      rv = aTransferable->GetTransferData(flavorStr.get(), getter_AddRefs(genericDataWrapper));
+      if (NS_FAILED(rv)) {
+        continue;
+      }
+
+      nsAutoString data;
+      if (nsCOMPtr<nsISupportsString> text = do_QueryInterface(genericDataWrapper)) {
+        text->GetData(data);
+      }
+
+      NSString* nativeString;
+      if (!data.IsEmpty()) {
+        nativeString = [NSString stringWithCharacters:(const unichar*)data.get()
+                                               length:data.Length()];
+      } else {
+        nativeString = [NSString string];
+      }
+
+      // be nice to Carbon apps, normalize the receiver's contents using Form C.
+      nativeString = [nativeString precomposedStringWithCanonicalMapping];
+      if (nativeString) {
+        [pasteboardOutputDict setObject:nativeString forKey:pboardType];
+      }
+    } else if (flavorStr.EqualsLiteral(kCustomTypesMime)) {
+      nsCOMPtr<nsISupports> genericDataWrapper;
+      rv = aTransferable->GetTransferData(flavorStr.get(), getter_AddRefs(genericDataWrapper));
+      if (NS_FAILED(rv)) {
+        continue;
+      }
+
+      nsAutoCString data;
+      if (nsCOMPtr<nsISupportsCString> text = do_QueryInterface(genericDataWrapper)) {
+        text->GetData(data);
+      }
+
+      if (!data.IsEmpty()) {
+        NSData* nativeData = [NSData dataWithBytes:data.get() length:data.Length()];
+        NSString* customType = [UTIHelper stringFromPboardType:kMozCustomTypesPboardType];
+        if (!nativeData) {
+          continue;
+        }
+        [pasteboardOutputDict setObject:nativeData forKey:customType];
+      }
+    } else if (nsClipboard::IsImageType(flavorStr)) {
+      nsCOMPtr<nsISupports> transferSupports;
+      rv = aTransferable->GetTransferData(flavorStr.get(), getter_AddRefs(transferSupports));
+      if (NS_FAILED(rv)) {
+        continue;
+      }
+
+      nsCOMPtr<imgIContainer> image(do_QueryInterface(transferSupports));
+      if (!image) {
+        NS_WARNING("Image isn't an imgIContainer in transferable");
+        continue;
+      }
+
+      RefPtr<SourceSurface> surface =
+          image->GetFrame(imgIContainer::FRAME_CURRENT,
+                          imgIContainer::FLAG_SYNC_DECODE | imgIContainer::FLAG_ASYNC_NOTIFY);
+      if (!surface) {
+        continue;
+      }
+      CGImageRef imageRef = NULL;
+      rv = nsCocoaUtils::CreateCGImageFromSurface(surface, &imageRef);
+      if (NS_FAILED(rv) || !imageRef) {
+        continue;
+      }
+
+      // Convert the CGImageRef to TIFF data.
+      CFMutableDataRef tiffData = CFDataCreateMutable(kCFAllocatorDefault, 0);
+      CGImageDestinationRef destRef =
+          CGImageDestinationCreateWithData(tiffData, CFSTR("public.tiff"), 1, NULL);
+      CGImageDestinationAddImage(destRef, imageRef, NULL);
+      bool successfullyConverted = CGImageDestinationFinalize(destRef);
+
+      CGImageRelease(imageRef);
+      if (destRef) {
+        CFRelease(destRef);
+      }
+
+      if (!successfullyConverted || !tiffData) {
+        if (tiffData) {
+          CFRelease(tiffData);
+        }
+        continue;
+      }
+
+      NSString* tiffType = [UTIHelper stringFromPboardType:NSPasteboardTypeTIFF];
+      [pasteboardOutputDict setObject:(NSMutableData*)tiffData forKey:tiffType];
+      CFRelease(tiffData);
+    } else if (flavorStr.EqualsLiteral(kFileMime)) {
+      nsCOMPtr<nsISupports> genericFile;
+      rv = aTransferable->GetTransferData(flavorStr.get(), getter_AddRefs(genericFile));
+      if (NS_FAILED(rv)) {
+        continue;
+      }
+
+      nsCOMPtr<nsIFile> file(do_QueryInterface(genericFile));
+      if (!file) {
+        continue;
+      }
+
+      nsAutoString fileURI;
+      rv = file->GetPath(fileURI);
+      if (NS_FAILED(rv)) {
+        continue;
+      }
+
+      NSString* str = nsCocoaUtils::ToNSString(fileURI);
+      NSURL* url = [NSURL fileURLWithPath:str isDirectory:NO];
+      if (!url || ![url absoluteString]) {
+        continue;
+      }
+      NSString* fileUTType = [UTIHelper stringFromPboardType:(NSString*)kUTTypeFileURL];
+      [pasteboardOutputDict setObject:[url absoluteString] forKey:fileUTType];
+    } else if (flavorStr.EqualsLiteral(kFilePromiseMime)) {
+      NSString* urlPromise =
+          [UTIHelper stringFromPboardType:(NSString*)kPasteboardTypeFileURLPromise];
+      NSString* urlPromiseContent =
+          [UTIHelper stringFromPboardType:(NSString*)kPasteboardTypeFilePromiseContent];
+      [pasteboardOutputDict setObject:[NSArray arrayWithObject:@""] forKey:urlPromise];
+      [pasteboardOutputDict setObject:[NSArray arrayWithObject:@""] forKey:urlPromiseContent];
+    } else if (flavorStr.EqualsLiteral(kURLMime)) {
+      nsCOMPtr<nsISupports> genericURL;
+      rv = aTransferable->GetTransferData(flavorStr.get(), getter_AddRefs(genericURL));
+      nsCOMPtr<nsISupportsString> urlObject(do_QueryInterface(genericURL));
+
+      nsAutoString url;
+      urlObject->GetData(url);
+
+      NSString* nativeTitle = nil;
+
+      // A newline embedded in the URL means that the form is actually URL +
+      // title. This embedding occurs in nsDragService::GetData.
+      int32_t newlinePos = url.FindChar(char16_t('\n'));
+      if (newlinePos >= 0) {
+        url.Truncate(newlinePos);
+
+        nsAutoString urlTitle;
+        urlObject->GetData(urlTitle);
+        urlTitle.Mid(urlTitle, newlinePos + 1, urlTitle.Length() - (newlinePos + 1));
+
+        nativeTitle =
+            [NSString stringWithCharacters:reinterpret_cast<const unichar*>(urlTitle.get())
+                                    length:urlTitle.Length()];
+      }
+      // The Finder doesn't like getting random binary data aka
+      // Unicode, so change it into an escaped URL containing only
+      // ASCII.
+      nsAutoCString utf8Data = NS_ConvertUTF16toUTF8(url.get(), url.Length());
+      nsAutoCString escData;
+      NS_EscapeURL(utf8Data.get(), utf8Data.Length(), esc_OnlyNonASCII | esc_AlwaysCopy, escData);
+
+      NSString* nativeURL = [NSString stringWithUTF8String:escData.get()];
+      NSString* publicUrl = [UTIHelper stringFromPboardType:kPublicUrlPboardType];
+      if (!nativeURL) {
+        continue;
+      }
+      [pasteboardOutputDict setObject:nativeURL forKey:publicUrl];
+      if (nativeTitle) {
+        NSArray* urlsAndTitles = @[ @[ nativeURL ], @[ nativeTitle ] ];
+        NSString* urlName = [UTIHelper stringFromPboardType:kPublicUrlNamePboardType];
+        NSString* urlsWithTitles = [UTIHelper stringFromPboardType:kUrlsWithTitlesPboardType];
+        [pasteboardOutputDict setObject:nativeTitle forKey:urlName];
+        [pasteboardOutputDict setObject:urlsAndTitles forKey:urlsWithTitles];
+      }
+    }
+    // If it wasn't a type that we recognize as exportable we don't put it on the system
+    // clipboard. We'll just access it from our cached transferable when we need it.
+  }
+
+  return pasteboardOutputDict;
+
+  NS_OBJC_END_TRY_BLOCK_RETURN(nil);
+}
+
+bool nsClipboard::IsStringType(const nsCString& aMIMEType, NSString** aPboardType) {
+  if (aMIMEType.EqualsLiteral(kTextMime)) {
+    *aPboardType = [UTIHelper stringFromPboardType:NSPasteboardTypeString];
+    return true;
+  } else if (aMIMEType.EqualsLiteral(kRTFMime)) {
+    *aPboardType = [UTIHelper stringFromPboardType:NSPasteboardTypeRTF];
+    return true;
+  } else if (aMIMEType.EqualsLiteral(kHTMLMime)) {
+    *aPboardType = [UTIHelper stringFromPboardType:NSPasteboardTypeHTML];
+    return true;
+  } else {
+    return false;
+  }
+}
+
+// static
+bool nsClipboard::IsImageType(const nsACString& aMIMEType) {
+  return aMIMEType.EqualsLiteral(kPNGImageMime) || aMIMEType.EqualsLiteral(kJPEGImageMime) ||
+         aMIMEType.EqualsLiteral(kJPGImageMime) || aMIMEType.EqualsLiteral(kGIFImageMime) ||
+         aMIMEType.EqualsLiteral(kNativeImageMime);
+}
+
+NSString* nsClipboard::WrapHtmlForSystemPasteboard(NSString* aString) {
+  NSString* wrapped = [NSString
+      stringWithFormat:@"<html>"
+                        "<head>"
+                        "<meta http-equiv=\"content-type\" content=\"text/html; charset=utf-8\">"
+                        "</head>"
+                        "<body>"
+                        "%@"
+                        "</body>"
+                        "</html>",
+                       aString];
+  return wrapped;
+}
+
+NS_IMETHODIMP
+nsClipboard::EmptyClipboard(int32_t aWhichClipboard) {
+  NS_OBJC_BEGIN_TRY_BLOCK_RETURN;
+
+  if (!mEmptyingForSetData) {
+    if (aWhichClipboard == kSelectionCache) {
+      ClearSelectionCache();
+    } else {
+      if (NSPasteboard* cocoaPasteboard = GetPasteboard(aWhichClipboard)) {
+        [cocoaPasteboard clearContents];
+      }
+      if (mCachedClipboard == aWhichClipboard) {
+        mCachedClipboard = -1;
+        mChangeCount = 0;
+      }
+    }
+  }
+
+  return nsBaseClipboard::EmptyClipboard(aWhichClipboard);
+
+  NS_OBJC_END_TRY_BLOCK_RETURN(NS_ERROR_FAILURE);
+}
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