diff -r 000000000000 -r 6474c204b198 content/base/src/nsPlainTextSerializer.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/content/base/src/nsPlainTextSerializer.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,1963 @@
+/* -*- 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/. */
+
+/*
+ * nsIContentSerializer implementation that can be used with an
+ * nsIDocumentEncoder to convert a DOM into plaintext in a nice way
+ * (eg for copy/paste as plaintext).
+ */
+
+#include "nsPlainTextSerializer.h"
+#include "nsLWBrkCIID.h"
+#include "nsIServiceManager.h"
+#include "nsGkAtoms.h"
+#include "nsNameSpaceManager.h"
+#include "nsTextFragment.h"
+#include "nsContentUtils.h"
+#include "nsReadableUtils.h"
+#include "nsUnicharUtils.h"
+#include "nsCRT.h"
+#include "mozilla/dom/Element.h"
+#include "mozilla/Preferences.h"
+
+using namespace mozilla;
+using namespace mozilla::dom;
+
+#define PREF_STRUCTS "converter.html2txt.structs"
+#define PREF_HEADER_STRATEGY "converter.html2txt.header_strategy"
+
+static const  int32_t kTabSize=4;
+static const  int32_t kIndentSizeHeaders = 2;  /* Indention of h1, if
+                                                mHeaderStrategy = 1 or = 2.
+                                                Indention of other headers
+                                                is derived from that.
+                                                XXX center h1? */
+static const  int32_t kIndentIncrementHeaders = 2;  /* If mHeaderStrategy = 1,
+                                                indent h(x+1) this many
+                                                columns more than h(x) */
+static const  int32_t kIndentSizeList = kTabSize;
+                               // Indention of non-first lines of ul and ol
+static const  int32_t kIndentSizeDD = kTabSize;  // Indention of <dd>
+static const  char16_t  kNBSP = 160;
+static const  char16_t kSPACE = ' ';
+
+static int32_t HeaderLevel(nsIAtom* aTag);
+static int32_t GetUnicharWidth(char16_t ucs);
+static int32_t GetUnicharStringWidth(const char16_t* pwcs, int32_t n);
+
+// Someday may want to make this non-const:
+static const uint32_t TagStackSize = 500;
+static const uint32_t OLStackSize = 100;
+
+nsresult NS_NewPlainTextSerializer(nsIContentSerializer** aSerializer)
+{
+  nsPlainTextSerializer* it = new nsPlainTextSerializer();
+  if (!it) {
+    return NS_ERROR_OUT_OF_MEMORY;
+  }
+
+  return CallQueryInterface(it, aSerializer);
+}
+
+nsPlainTextSerializer::nsPlainTextSerializer()
+  : kSpace(NS_LITERAL_STRING(" ")) // Init of "constant"
+{
+
+  mOutputString = nullptr;
+  mHeadLevel = 0;
+  mAtFirstColumn = true;
+  mIndent = 0;
+  mCiteQuoteLevel = 0;
+  mStructs = true;       // will be read from prefs later
+  mHeaderStrategy = 1 /*indent increasingly*/;   // ditto
+  mDontWrapAnyQuotes = false;                 // ditto
+  mHasWrittenCiteBlockquote = false;
+  mSpanLevel = 0;
+  for (int32_t i = 0; i <= 6; i++) {
+    mHeaderCounter[i] = 0;
+  }
+
+  // Line breaker
+  mWrapColumn = 72;     // XXX magic number, we expect someone to reset this
+  mCurrentLineWidth = 0;
+
+  // Flow
+  mEmptyLines = 1; // The start of the document is an "empty line" in itself,
+  mInWhitespace = false;
+  mPreFormatted = false;
+  mStartedOutput = false;
+
+  // initialize the tag stack to zero:
+  // The stack only ever contains pointers to static atoms, so they don't
+  // need refcounting.
+  mTagStack = new nsIAtom*[TagStackSize];
+  mTagStackIndex = 0;
+  mIgnoreAboveIndex = (uint32_t)kNotFound;
+
+  // initialize the OL stack, where numbers for ordered lists are kept
+  mOLStack = new int32_t[OLStackSize];
+  mOLStackIndex = 0;
+
+  mULCount = 0;
+
+  mIgnoredChildNodeLevel = 0;
+}
+
+nsPlainTextSerializer::~nsPlainTextSerializer()
+{
+  delete[] mTagStack;
+  delete[] mOLStack;
+  NS_WARN_IF_FALSE(mHeadLevel == 0, "Wrong head level!");
+}
+
+NS_IMPL_ISUPPORTS(nsPlainTextSerializer,
+                  nsIContentSerializer)
+
+
+NS_IMETHODIMP 
+nsPlainTextSerializer::Init(uint32_t aFlags, uint32_t aWrapColumn,
+                            const char* aCharSet, bool aIsCopying,
+                            bool aIsWholeDocument)
+{
+#ifdef DEBUG
+  // Check if the major control flags are set correctly.
+  if (aFlags & nsIDocumentEncoder::OutputFormatFlowed) {
+    NS_ASSERTION(aFlags & nsIDocumentEncoder::OutputFormatted,
+                 "If you want format=flowed, you must combine it with "
+                 "nsIDocumentEncoder::OutputFormatted");
+  }
+
+  if (aFlags & nsIDocumentEncoder::OutputFormatted) {
+    NS_ASSERTION(!(aFlags & nsIDocumentEncoder::OutputPreformatted),
+                 "Can't do formatted and preformatted output at the same time!");
+  }
+#endif
+
+  mFlags = aFlags;
+  mWrapColumn = aWrapColumn;
+
+  // Only create a linebreaker if we will handle wrapping.
+  if (MayWrap()) {
+    mLineBreaker = nsContentUtils::LineBreaker();
+  }
+
+  // Set the line break character:
+  if ((mFlags & nsIDocumentEncoder::OutputCRLineBreak)
+      && (mFlags & nsIDocumentEncoder::OutputLFLineBreak)) {
+    // Windows
+    mLineBreak.AssignLiteral("\r\n");
+  }
+  else if (mFlags & nsIDocumentEncoder::OutputCRLineBreak) {
+    // Mac
+    mLineBreak.Assign(char16_t('\r'));
+  }
+  else if (mFlags & nsIDocumentEncoder::OutputLFLineBreak) {
+    // Unix/DOM
+    mLineBreak.Assign(char16_t('\n'));
+  }
+  else {
+    // Platform/default
+    mLineBreak.AssignLiteral(NS_LINEBREAK);
+  }
+
+  mLineBreakDue = false;
+  mFloatingLines = -1;
+
+  if (mFlags & nsIDocumentEncoder::OutputFormatted) {
+    // Get some prefs that controls how we do formatted output
+    mStructs = Preferences::GetBool(PREF_STRUCTS, mStructs);
+
+    mHeaderStrategy =
+      Preferences::GetInt(PREF_HEADER_STRATEGY, mHeaderStrategy);
+
+    // DontWrapAnyQuotes is set according to whether plaintext mail
+    // is wrapping to window width -- see bug 134439.
+    // We'll only want this if we're wrapping and formatted.
+    if (mFlags & nsIDocumentEncoder::OutputWrap || mWrapColumn > 0) {
+      mDontWrapAnyQuotes =
+        Preferences::GetBool("mail.compose.wrap_to_window_width",
+                             mDontWrapAnyQuotes);
+    }
+  }
+
+  // XXX We should let the caller pass this in.
+  if (Preferences::GetBool("browser.frames.enabled")) {
+    mFlags &= ~nsIDocumentEncoder::OutputNoFramesContent;
+  }
+  else {
+    mFlags |= nsIDocumentEncoder::OutputNoFramesContent;
+  }
+
+  return NS_OK;
+}
+
+bool
+nsPlainTextSerializer::GetLastBool(const nsTArray<bool>& aStack)
+{
+  uint32_t size = aStack.Length();
+  if (size == 0) {
+    return false;
+  }
+  return aStack.ElementAt(size-1);
+}
+
+void
+nsPlainTextSerializer::SetLastBool(nsTArray<bool>& aStack, bool aValue)
+{
+  uint32_t size = aStack.Length();
+  if (size > 0) {
+    aStack.ElementAt(size-1) = aValue;
+  }
+  else {
+    NS_ERROR("There is no \"Last\" value");
+  }
+}
+
+void
+nsPlainTextSerializer::PushBool(nsTArray<bool>& aStack, bool aValue)
+{
+    aStack.AppendElement(bool(aValue));
+}
+
+bool
+nsPlainTextSerializer::PopBool(nsTArray<bool>& aStack)
+{
+  bool returnValue = false;
+  uint32_t size = aStack.Length();
+  if (size > 0) {
+    returnValue = aStack.ElementAt(size-1);
+    aStack.RemoveElementAt(size-1);
+  }
+  return returnValue;
+}
+
+bool
+nsPlainTextSerializer::ShouldReplaceContainerWithPlaceholder(nsIAtom* aTag)
+{
+  // If nsIDocumentEncoder::OutputNonTextContentAsPlaceholder is set,
+  // non-textual container element should be serialized as placeholder
+  // character and its child nodes should be ignored. See bug 895239.
+  if (!(mFlags & nsIDocumentEncoder::OutputNonTextContentAsPlaceholder)) {
+    return false;
+  }
+
+  return
+    (aTag == nsGkAtoms::audio) ||
+    (aTag == nsGkAtoms::canvas) ||
+    (aTag == nsGkAtoms::iframe) ||
+    (aTag == nsGkAtoms::meter) ||
+    (aTag == nsGkAtoms::progress) ||
+    (aTag == nsGkAtoms::object) ||
+    (aTag == nsGkAtoms::svg) ||
+    (aTag == nsGkAtoms::video);
+}
+
+NS_IMETHODIMP 
+nsPlainTextSerializer::AppendText(nsIContent* aText,
+                                  int32_t aStartOffset,
+                                  int32_t aEndOffset, 
+                                  nsAString& aStr)
+{
+  if (mIgnoreAboveIndex != (uint32_t)kNotFound) {
+    return NS_OK;
+  }
+    
+  NS_ASSERTION(aStartOffset >= 0, "Negative start offset for text fragment!");
+  if ( aStartOffset < 0 )
+    return NS_ERROR_INVALID_ARG;
+
+  NS_ENSURE_ARG(aText);
+
+  nsresult rv = NS_OK;
+
+  nsIContent* content = aText;
+  const nsTextFragment* frag;
+  if (!content || !(frag = content->GetText())) {
+    return NS_ERROR_FAILURE;
+  }
+  
+  int32_t fragLength = frag->GetLength();
+  int32_t endoffset = (aEndOffset == -1) ? fragLength : std::min(aEndOffset, fragLength);
+  NS_ASSERTION(aStartOffset <= endoffset, "A start offset is beyond the end of the text fragment!");
+
+  int32_t length = endoffset - aStartOffset;
+  if (length <= 0) {
+    return NS_OK;
+  }
+
+  nsAutoString textstr;
+  if (frag->Is2b()) {
+    textstr.Assign(frag->Get2b() + aStartOffset, length);
+  }
+  else {
+    // AssignASCII is for 7-bit character only, so don't use it
+    const char *data = frag->Get1b();
+    CopyASCIItoUTF16(Substring(data + aStartOffset, data + endoffset), textstr);
+  }
+
+  mOutputString = &aStr;
+
+  // We have to split the string across newlines
+  // to match parser behavior
+  int32_t start = 0;
+  int32_t offset = textstr.FindCharInSet("\n\r");
+  while (offset != kNotFound) {
+
+    if (offset>start) {
+      // Pass in the line
+      DoAddText(false,
+                Substring(textstr, start, offset-start));
+    }
+
+    // Pass in a newline
+    DoAddText(true, mLineBreak);
+    
+    start = offset+1;
+    offset = textstr.FindCharInSet("\n\r", start);
+  }
+
+  // Consume the last bit of the string if there's any left
+  if (start < length) {
+    if (start) {
+      DoAddText(false, Substring(textstr, start, length - start));
+    }
+    else {
+      DoAddText(false, textstr);
+    }
+  }
+  
+  mOutputString = nullptr;
+
+  return rv;
+}
+
+NS_IMETHODIMP
+nsPlainTextSerializer::AppendCDATASection(nsIContent* aCDATASection,
+                                          int32_t aStartOffset,
+                                          int32_t aEndOffset,
+                                          nsAString& aStr)
+{
+  return AppendText(aCDATASection, aStartOffset, aEndOffset, aStr);
+}
+
+NS_IMETHODIMP
+nsPlainTextSerializer::AppendElementStart(Element* aElement,
+                                          Element* aOriginalElement,
+                                          nsAString& aStr)
+{
+  NS_ENSURE_ARG(aElement);
+
+  mElement = aElement;
+
+  nsresult rv;
+  nsIAtom* id = GetIdForContent(mElement);
+
+  bool isContainer = !nsContentUtils::IsHTMLVoid(id);
+
+  mOutputString = &aStr;
+
+  if (isContainer) {
+    rv = DoOpenContainer(id);
+  }
+  else {
+    rv = DoAddLeaf(id);
+  }
+
+  mElement = nullptr;
+  mOutputString = nullptr;
+
+  if (id == nsGkAtoms::head) {
+    ++mHeadLevel;
+  }
+
+  return rv;
+} 
+ 
+NS_IMETHODIMP 
+nsPlainTextSerializer::AppendElementEnd(Element* aElement,
+                                        nsAString& aStr)
+{
+  NS_ENSURE_ARG(aElement);
+
+  mElement = aElement;
+
+  nsresult rv;
+  nsIAtom* id = GetIdForContent(mElement);
+
+  bool isContainer = !nsContentUtils::IsHTMLVoid(id);
+
+  mOutputString = &aStr;
+
+  rv = NS_OK;
+  if (isContainer) {
+    rv = DoCloseContainer(id);
+  }
+
+  mElement = nullptr;
+  mOutputString = nullptr;
+
+  if (id == nsGkAtoms::head) {
+    NS_ASSERTION(mHeadLevel != 0,
+                 "mHeadLevel being decremented below 0");
+    --mHeadLevel;
+  }
+
+  return rv;
+}
+
+NS_IMETHODIMP 
+nsPlainTextSerializer::Flush(nsAString& aStr)
+{
+  mOutputString = &aStr;
+  FlushLine();
+  mOutputString = nullptr;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsPlainTextSerializer::AppendDocumentStart(nsIDocument *aDocument,
+                                           nsAString& aStr)
+{
+  return NS_OK;
+}
+
+nsresult
+nsPlainTextSerializer::DoOpenContainer(nsIAtom* aTag)
+{
+  // Check if we need output current node as placeholder character and ignore
+  // child nodes.
+  if (ShouldReplaceContainerWithPlaceholder(mElement->Tag())) {
+    if (mIgnoredChildNodeLevel == 0) {
+      // Serialize current node as placeholder character
+      Write(NS_LITERAL_STRING("\xFFFC"));
+    }
+    // Ignore child nodes.
+    mIgnoredChildNodeLevel++;
+    return NS_OK;
+  }
+
+  if (mFlags & nsIDocumentEncoder::OutputRaw) {
+    // Raw means raw.  Don't even think about doing anything fancy
+    // here like indenting, adding line breaks or any other
+    // characters such as list item bullets, quote characters
+    // around <q>, etc.  I mean it!  Don't make me smack you!
+
+    return NS_OK;
+  }
+
+  if (mTagStackIndex < TagStackSize) {
+    mTagStack[mTagStackIndex++] = aTag;
+  }
+
+  if (mIgnoreAboveIndex != (uint32_t)kNotFound) {
+    return NS_OK;
+  }
+
+  // Reset this so that <blockquote type=cite> doesn't affect the whitespace
+  // above random <pre>s below it.
+  mHasWrittenCiteBlockquote = mHasWrittenCiteBlockquote &&
+                              aTag == nsGkAtoms::pre;
+
+  bool isInCiteBlockquote = false;
+
+  // XXX special-case <blockquote type=cite> so that we don't add additional
+  // newlines before the text.
+  if (aTag == nsGkAtoms::blockquote) {
+    nsAutoString value;
+    nsresult rv = GetAttributeValue(nsGkAtoms::type, value);
+    isInCiteBlockquote = NS_SUCCEEDED(rv) && value.EqualsIgnoreCase("cite");
+  }
+
+  if (mLineBreakDue && !isInCiteBlockquote)
+    EnsureVerticalSpace(mFloatingLines);
+
+  // Check if this tag's content that should not be output
+  if ((aTag == nsGkAtoms::noscript &&
+       !(mFlags & nsIDocumentEncoder::OutputNoScriptContent)) ||
+      ((aTag == nsGkAtoms::iframe || aTag == nsGkAtoms::noframes) &&
+       !(mFlags & nsIDocumentEncoder::OutputNoFramesContent))) {
+    // Ignore everything that follows the current tag in 
+    // question until a matching end tag is encountered.
+    mIgnoreAboveIndex = mTagStackIndex - 1;
+    return NS_OK;
+  }
+
+  if (aTag == nsGkAtoms::body) {
+    // Try to figure out here whether we have a
+    // preformatted style attribute.
+    //
+    // Trigger on the presence of a "pre-wrap" in the
+    // style attribute. That's a very simplistic way to do
+    // it, but better than nothing.
+    // Also set mWrapColumn to the value given there
+    // (which arguably we should only do if told to do so).
+    nsAutoString style;
+    int32_t whitespace;
+    if (NS_SUCCEEDED(GetAttributeValue(nsGkAtoms::style, style)) &&
+       (kNotFound != (whitespace = style.Find("white-space:")))) {
+
+      if (kNotFound != style.Find("pre-wrap", true, whitespace)) {
+#ifdef DEBUG_preformatted
+        printf("Set mPreFormatted based on style pre-wrap\n");
+#endif
+        mPreFormatted = true;
+        int32_t widthOffset = style.Find("width:");
+        if (widthOffset >= 0) {
+          // We have to search for the ch before the semicolon,
+          // not for the semicolon itself, because nsString::ToInteger()
+          // considers 'c' to be a valid numeric char (even if radix=10)
+          // but then gets confused if it sees it next to the number
+          // when the radix specified was 10, and returns an error code.
+          int32_t semiOffset = style.Find("ch", false, widthOffset+6);
+          int32_t length = (semiOffset > 0 ? semiOffset - widthOffset - 6
+                            : style.Length() - widthOffset);
+          nsAutoString widthstr;
+          style.Mid(widthstr, widthOffset+6, length);
+          nsresult err;
+          int32_t col = widthstr.ToInteger(&err);
+
+          if (NS_SUCCEEDED(err)) {
+            mWrapColumn = (uint32_t)col;
+#ifdef DEBUG_preformatted
+            printf("Set wrap column to %d based on style\n", mWrapColumn);
+#endif
+          }
+        }
+      }
+      else if (kNotFound != style.Find("pre", true, whitespace)) {
+#ifdef DEBUG_preformatted
+        printf("Set mPreFormatted based on style pre\n");
+#endif
+        mPreFormatted = true;
+        mWrapColumn = 0;
+      }
+    } 
+    else {
+      /* See comment at end of function. */
+      mInWhitespace = true;
+      mPreFormatted = false;
+    }
+
+    return NS_OK;
+  }
+
+  // Keep this in sync with DoCloseContainer!
+  if (!DoOutput()) {
+    return NS_OK;
+  }
+
+  if (aTag == nsGkAtoms::p)
+    EnsureVerticalSpace(1);
+  else if (aTag == nsGkAtoms::pre) {
+    if (GetLastBool(mIsInCiteBlockquote))
+      EnsureVerticalSpace(0);
+    else if (mHasWrittenCiteBlockquote) {
+      EnsureVerticalSpace(0);
+      mHasWrittenCiteBlockquote = false;
+    }
+    else
+      EnsureVerticalSpace(1);
+  }
+  else if (aTag == nsGkAtoms::tr) {
+    PushBool(mHasWrittenCellsForRow, false);
+  }
+  else if (aTag == nsGkAtoms::td || aTag == nsGkAtoms::th) {
+    // We must make sure that the content of two table cells get a
+    // space between them.
+
+    // To make the separation between cells most obvious and
+    // importable, we use a TAB.
+    if (GetLastBool(mHasWrittenCellsForRow)) {
+      // Bypass |Write| so that the TAB isn't compressed away.
+      AddToLine(MOZ_UTF16("\t"), 1);
+      mInWhitespace = true;
+    }
+    else if (mHasWrittenCellsForRow.IsEmpty()) {
+      // We don't always see a <tr> (nor a <table>) before the <td> if we're
+      // copying part of a table
+      PushBool(mHasWrittenCellsForRow, true); // will never be popped
+    }
+    else {
+      SetLastBool(mHasWrittenCellsForRow, true);
+    }
+  }
+  else if (aTag == nsGkAtoms::ul) {
+    // Indent here to support nested lists, which aren't included in li :-(
+    EnsureVerticalSpace(mULCount + mOLStackIndex == 0 ? 1 : 0);
+         // Must end the current line before we change indention
+    mIndent += kIndentSizeList;
+    mULCount++;
+  }
+  else if (aTag == nsGkAtoms::ol) {
+    EnsureVerticalSpace(mULCount + mOLStackIndex == 0 ? 1 : 0);
+    if (mFlags & nsIDocumentEncoder::OutputFormatted) {
+      // Must end the current line before we change indention
+      if (mOLStackIndex < OLStackSize) {
+        nsAutoString startAttr;
+        int32_t startVal = 1;
+        if (NS_SUCCEEDED(GetAttributeValue(nsGkAtoms::start, startAttr))) {
+          nsresult rv = NS_OK;
+          startVal = startAttr.ToInteger(&rv);
+          if (NS_FAILED(rv))
+            startVal = 1;
+        }
+        mOLStack[mOLStackIndex++] = startVal;
+      }
+    } else {
+      mOLStackIndex++;
+    }
+    mIndent += kIndentSizeList;  // see ul
+  }
+  else if (aTag == nsGkAtoms::li &&
+           (mFlags & nsIDocumentEncoder::OutputFormatted)) {
+    if (mTagStackIndex > 1 && IsInOL()) {
+      if (mOLStackIndex > 0) {
+        nsAutoString valueAttr;
+        if (NS_SUCCEEDED(GetAttributeValue(nsGkAtoms::value, valueAttr))) {
+          nsresult rv = NS_OK;
+          int32_t valueAttrVal = valueAttr.ToInteger(&rv);
+          if (NS_SUCCEEDED(rv))
+            mOLStack[mOLStackIndex-1] = valueAttrVal;
+        }
+        // This is what nsBulletFrame does for OLs:
+        mInIndentString.AppendInt(mOLStack[mOLStackIndex-1]++, 10);
+      }
+      else {
+        mInIndentString.Append(char16_t('#'));
+      }
+
+      mInIndentString.Append(char16_t('.'));
+
+    }
+    else {
+      static char bulletCharArray[] = "*o+#";
+      uint32_t index = mULCount > 0 ? (mULCount - 1) : 3;
+      char bulletChar = bulletCharArray[index % 4];
+      mInIndentString.Append(char16_t(bulletChar));
+    }
+
+    mInIndentString.Append(char16_t(' '));
+  }
+  else if (aTag == nsGkAtoms::dl) {
+    EnsureVerticalSpace(1);
+  }
+  else if (aTag == nsGkAtoms::dt) {
+    EnsureVerticalSpace(0);
+  }
+  else if (aTag == nsGkAtoms::dd) {
+    EnsureVerticalSpace(0);
+    mIndent += kIndentSizeDD;
+  }
+  else if (aTag == nsGkAtoms::span) {
+    ++mSpanLevel;
+  }
+  else if (aTag == nsGkAtoms::blockquote) {
+    // Push
+    PushBool(mIsInCiteBlockquote, isInCiteBlockquote);
+    if (isInCiteBlockquote) {
+      EnsureVerticalSpace(0);
+      mCiteQuoteLevel++;
+    }
+    else {
+      EnsureVerticalSpace(1);
+      mIndent += kTabSize; // Check for some maximum value?
+    }
+  }
+  else if (aTag == nsGkAtoms::q) {
+    Write(NS_LITERAL_STRING("\""));
+  }
+
+  // Else make sure we'll separate block level tags,
+  // even if we're about to leave, before doing any other formatting.
+  else if (nsContentUtils::IsHTMLBlock(aTag)) {
+    EnsureVerticalSpace(0);
+  }
+
+  //////////////////////////////////////////////////////////////
+  if (!(mFlags & nsIDocumentEncoder::OutputFormatted)) {
+    return NS_OK;
+  }
+  //////////////////////////////////////////////////////////////
+  // The rest of this routine is formatted output stuff,
+  // which we should skip if we're not formatted:
+  //////////////////////////////////////////////////////////////
+
+  // Push on stack
+  bool currentNodeIsConverted = IsCurrentNodeConverted();
+
+  if (aTag == nsGkAtoms::h1 || aTag == nsGkAtoms::h2 ||
+      aTag == nsGkAtoms::h3 || aTag == nsGkAtoms::h4 ||
+      aTag == nsGkAtoms::h5 || aTag == nsGkAtoms::h6)
+  {
+    EnsureVerticalSpace(2);
+    if (mHeaderStrategy == 2) {  // numbered
+      mIndent += kIndentSizeHeaders;
+      // Caching
+      int32_t level = HeaderLevel(aTag);
+      // Increase counter for current level
+      mHeaderCounter[level]++;
+      // Reset all lower levels
+      int32_t i;
+
+      for (i = level + 1; i <= 6; i++) {
+        mHeaderCounter[i] = 0;
+      }
+
+      // Construct numbers
+      nsAutoString leadup;
+      for (i = 1; i <= level; i++) {
+        leadup.AppendInt(mHeaderCounter[i]);
+        leadup.Append(char16_t('.'));
+      }
+      leadup.Append(char16_t(' '));
+      Write(leadup);
+    }
+    else if (mHeaderStrategy == 1) { // indent increasingly
+      mIndent += kIndentSizeHeaders;
+      for (int32_t i = HeaderLevel(aTag); i > 1; i--) {
+           // for h(x), run x-1 times
+        mIndent += kIndentIncrementHeaders;
+      }
+    }
+  }
+  else if (aTag == nsGkAtoms::a && !currentNodeIsConverted) {
+    nsAutoString url;
+    if (NS_SUCCEEDED(GetAttributeValue(nsGkAtoms::href, url))
+        && !url.IsEmpty()) {
+      mURL = url;
+    }
+  }
+  else if (aTag == nsGkAtoms::sup && mStructs && !currentNodeIsConverted) {
+    Write(NS_LITERAL_STRING("^"));
+  }
+  else if (aTag == nsGkAtoms::sub && mStructs && !currentNodeIsConverted) {
+    Write(NS_LITERAL_STRING("_"));
+  }
+  else if (aTag == nsGkAtoms::code && mStructs && !currentNodeIsConverted) {
+    Write(NS_LITERAL_STRING("|"));
+  }
+  else if ((aTag == nsGkAtoms::strong || aTag == nsGkAtoms::b)
+           && mStructs && !currentNodeIsConverted) {
+    Write(NS_LITERAL_STRING("*"));
+  }
+  else if ((aTag == nsGkAtoms::em || aTag == nsGkAtoms::i)
+           && mStructs && !currentNodeIsConverted) {
+    Write(NS_LITERAL_STRING("/"));
+  }
+  else if (aTag == nsGkAtoms::u && mStructs && !currentNodeIsConverted) {
+    Write(NS_LITERAL_STRING("_"));
+  }
+
+  /* Container elements are always block elements, so we shouldn't
+     output any whitespace immediately after the container tag even if
+     there's extra whitespace there because the HTML is pretty-printed
+     or something. To ensure that happens, tell the serializer we're
+     already in whitespace so it won't output more. */
+  mInWhitespace = true;
+
+  return NS_OK;
+}
+
+nsresult
+nsPlainTextSerializer::DoCloseContainer(nsIAtom* aTag)
+{
+  if (ShouldReplaceContainerWithPlaceholder(mElement->Tag())) {
+    mIgnoredChildNodeLevel--;
+    return NS_OK;
+  }
+
+  if (mFlags & nsIDocumentEncoder::OutputRaw) {
+    // Raw means raw.  Don't even think about doing anything fancy
+    // here like indenting, adding line breaks or any other
+    // characters such as list item bullets, quote characters
+    // around <q>, etc.  I mean it!  Don't make me smack you!
+
+    return NS_OK;
+  }
+
+  if (mTagStackIndex > 0) {
+    --mTagStackIndex;
+  }
+
+  if (mTagStackIndex >= mIgnoreAboveIndex) {
+    if (mTagStackIndex == mIgnoreAboveIndex) {
+      // We're dealing with the close tag whose matching
+      // open tag had set the mIgnoreAboveIndex value.
+      // Reset mIgnoreAboveIndex before discarding this tag.
+      mIgnoreAboveIndex = (uint32_t)kNotFound;
+    }
+    return NS_OK;
+  }
+
+  // End current line if we're ending a block level tag
+  if ((aTag == nsGkAtoms::body) || (aTag == nsGkAtoms::html)) {
+    // We want the output to end with a new line,
+    // but in preformatted areas like text fields,
+    // we can't emit newlines that weren't there.
+    // So add the newline only in the case of formatted output.
+    if (mFlags & nsIDocumentEncoder::OutputFormatted) {
+      EnsureVerticalSpace(0);
+    }
+    else {
+      FlushLine();
+    }
+    // We won't want to do anything with these in formatted mode either,
+    // so just return now:
+    return NS_OK;
+  }
+
+  // Keep this in sync with DoOpenContainer!
+  if (!DoOutput()) {
+    return NS_OK;
+  }
+
+  if (aTag == nsGkAtoms::tr) {
+    PopBool(mHasWrittenCellsForRow);
+    // Should always end a line, but get no more whitespace
+    if (mFloatingLines < 0)
+      mFloatingLines = 0;
+    mLineBreakDue = true;
+  }
+  else if (((aTag == nsGkAtoms::li) ||
+            (aTag == nsGkAtoms::dt)) &&
+           (mFlags & nsIDocumentEncoder::OutputFormatted)) {
+    // Items that should always end a line, but get no more whitespace
+    if (mFloatingLines < 0)
+      mFloatingLines = 0;
+    mLineBreakDue = true;
+  }
+  else if (aTag == nsGkAtoms::pre) {
+    mFloatingLines = GetLastBool(mIsInCiteBlockquote) ? 0 : 1;
+    mLineBreakDue = true;
+  }
+  else if (aTag == nsGkAtoms::ul) {
+    FlushLine();
+    mIndent -= kIndentSizeList;
+    if (--mULCount + mOLStackIndex == 0) {
+      mFloatingLines = 1;
+      mLineBreakDue = true;
+    }
+  }
+  else if (aTag == nsGkAtoms::ol) {
+    FlushLine(); // Doing this after decreasing OLStackIndex would be wrong.
+    mIndent -= kIndentSizeList;
+    NS_ASSERTION(mOLStackIndex, "Wrong OLStack level!");
+    mOLStackIndex--;
+    if (mULCount + mOLStackIndex == 0) {
+      mFloatingLines = 1;
+      mLineBreakDue = true;
+    }
+  }  
+  else if (aTag == nsGkAtoms::dl) {
+    mFloatingLines = 1;
+    mLineBreakDue = true;
+  }
+  else if (aTag == nsGkAtoms::dd) {
+    FlushLine();
+    mIndent -= kIndentSizeDD;
+  }
+  else if (aTag == nsGkAtoms::span) {
+    NS_ASSERTION(mSpanLevel, "Span level will be negative!");
+    --mSpanLevel;
+  }
+  else if (aTag == nsGkAtoms::div) {
+    if (mFloatingLines < 0)
+      mFloatingLines = 0;
+    mLineBreakDue = true;
+  }
+  else if (aTag == nsGkAtoms::blockquote) {
+    FlushLine();    // Is this needed?
+
+    // Pop
+    bool isInCiteBlockquote = PopBool(mIsInCiteBlockquote);
+
+    if (isInCiteBlockquote) {
+      NS_ASSERTION(mCiteQuoteLevel, "CiteQuote level will be negative!");
+      mCiteQuoteLevel--;
+      mFloatingLines = 0;
+      mHasWrittenCiteBlockquote = true;
+    }
+    else {
+      mIndent -= kTabSize;
+      mFloatingLines = 1;
+    }
+    mLineBreakDue = true;
+  }
+  else if (aTag == nsGkAtoms::q) {
+    Write(NS_LITERAL_STRING("\""));
+  }
+  else if (nsContentUtils::IsHTMLBlock(aTag)
+           && aTag != nsGkAtoms::script) {
+    // All other blocks get 1 vertical space after them
+    // in formatted mode, otherwise 0.
+    // This is hard. Sometimes 0 is a better number, but
+    // how to know?
+    if (mFlags & nsIDocumentEncoder::OutputFormatted)
+      EnsureVerticalSpace(1);
+    else {
+      if (mFloatingLines < 0)
+        mFloatingLines = 0;
+      mLineBreakDue = true;
+    }
+  }
+
+  //////////////////////////////////////////////////////////////
+  if (!(mFlags & nsIDocumentEncoder::OutputFormatted)) {
+    return NS_OK;
+  }
+  //////////////////////////////////////////////////////////////
+  // The rest of this routine is formatted output stuff,
+  // which we should skip if we're not formatted:
+  //////////////////////////////////////////////////////////////
+
+  // Pop the currentConverted stack
+  bool currentNodeIsConverted = IsCurrentNodeConverted();
+  
+  if (aTag == nsGkAtoms::h1 || aTag == nsGkAtoms::h2 ||
+      aTag == nsGkAtoms::h3 || aTag == nsGkAtoms::h4 ||
+      aTag == nsGkAtoms::h5 || aTag == nsGkAtoms::h6) {
+    
+    if (mHeaderStrategy) {  /*numbered or indent increasingly*/ 
+      mIndent -= kIndentSizeHeaders;
+    }
+    if (mHeaderStrategy == 1 /*indent increasingly*/ ) {
+      for (int32_t i = HeaderLevel(aTag); i > 1; i--) {
+           // for h(x), run x-1 times
+        mIndent -= kIndentIncrementHeaders;
+      }
+    }
+    EnsureVerticalSpace(1);
+  }
+  else if (aTag == nsGkAtoms::a && !currentNodeIsConverted && !mURL.IsEmpty()) {
+    nsAutoString temp; 
+    temp.AssignLiteral(" <");
+    temp += mURL;
+    temp.Append(char16_t('>'));
+    Write(temp);
+    mURL.Truncate();
+  }
+  else if ((aTag == nsGkAtoms::sup || aTag == nsGkAtoms::sub)
+           && mStructs && !currentNodeIsConverted) {
+    Write(kSpace);
+  }
+  else if (aTag == nsGkAtoms::code && mStructs && !currentNodeIsConverted) {
+    Write(NS_LITERAL_STRING("|"));
+  }
+  else if ((aTag == nsGkAtoms::strong || aTag == nsGkAtoms::b)
+           && mStructs && !currentNodeIsConverted) {
+    Write(NS_LITERAL_STRING("*"));
+  }
+  else if ((aTag == nsGkAtoms::em || aTag == nsGkAtoms::i)
+           && mStructs && !currentNodeIsConverted) {
+    Write(NS_LITERAL_STRING("/"));
+  }
+  else if (aTag == nsGkAtoms::u && mStructs && !currentNodeIsConverted) {
+    Write(NS_LITERAL_STRING("_"));
+  }
+
+  return NS_OK;
+}
+
+bool
+nsPlainTextSerializer::MustSuppressLeaf()
+{
+  if (mIgnoredChildNodeLevel > 0) {
+    return true;
+  }
+
+  if ((mTagStackIndex > 1 &&
+       mTagStack[mTagStackIndex-2] == nsGkAtoms::select) ||
+      (mTagStackIndex > 0 &&
+        mTagStack[mTagStackIndex-1] == nsGkAtoms::select)) {
+    // Don't output the contents of SELECT elements;
+    // Might be nice, eventually, to output just the selected element.
+    // Read more in bug 31994.
+    return true;
+  }
+
+  if (mTagStackIndex > 0 &&
+      (mTagStack[mTagStackIndex-1] == nsGkAtoms::script ||
+       mTagStack[mTagStackIndex-1] == nsGkAtoms::style)) {
+    // Don't output the contents of <script> or <style> tags;
+    return true;
+  }
+
+  return false;
+}
+
+void
+nsPlainTextSerializer::DoAddText(bool aIsLineBreak, const nsAString& aText)
+{
+  // If we don't want any output, just return
+  if (!DoOutput()) {
+    return;
+  }
+
+  if (!aIsLineBreak) {
+    // Make sure to reset this, since it's no longer true.
+    mHasWrittenCiteBlockquote = false;
+  }
+
+  if (mLineBreakDue)
+    EnsureVerticalSpace(mFloatingLines);
+
+  if (MustSuppressLeaf()) {
+    return;
+  }
+
+  if (aIsLineBreak) {
+    // The only times we want to pass along whitespace from the original
+    // html source are if we're forced into preformatted mode via flags,
+    // or if we're prettyprinting and we're inside a <pre>.
+    // Otherwise, either we're collapsing to minimal text, or we're
+    // prettyprinting to mimic the html format, and in neither case
+    // does the formatting of the html source help us.
+    if ((mFlags & nsIDocumentEncoder::OutputPreformatted) ||
+        (mPreFormatted && !mWrapColumn) ||
+        IsInPre()) {
+      EnsureVerticalSpace(mEmptyLines+1);
+    }
+    else if (!mInWhitespace) {
+      Write(kSpace);
+      mInWhitespace = true;
+    }
+    return;
+  }
+
+  /* Check, if we are in a link (symbolized with mURL containing the URL)
+     and the text is equal to the URL. In that case we don't want to output
+     the URL twice so we scrap the text in mURL. */
+  if (!mURL.IsEmpty() && mURL.Equals(aText)) {
+    mURL.Truncate();
+  }
+  Write(aText);
+}
+
+nsresult
+nsPlainTextSerializer::DoAddLeaf(nsIAtom* aTag)
+{
+  // If we don't want any output, just return
+  if (!DoOutput()) {
+    return NS_OK;
+  }
+
+  if (mLineBreakDue)
+    EnsureVerticalSpace(mFloatingLines);
+
+  if (MustSuppressLeaf()) {
+    return NS_OK;
+  }
+
+  if (aTag == nsGkAtoms::br) {
+    // Another egregious editor workaround, see bug 38194:
+    // ignore the bogus br tags that the editor sticks here and there.
+    nsAutoString tagAttr;
+    if (NS_FAILED(GetAttributeValue(nsGkAtoms::type, tagAttr))
+        || !tagAttr.EqualsLiteral("_moz")) {
+      EnsureVerticalSpace(mEmptyLines+1);
+    }
+  }
+  else if (aTag == nsGkAtoms::hr &&
+           (mFlags & nsIDocumentEncoder::OutputFormatted)) {
+    EnsureVerticalSpace(0);
+
+    // Make a line of dashes as wide as the wrap width
+    // XXX honoring percentage would be nice
+    nsAutoString line;
+    uint32_t width = (mWrapColumn > 0 ? mWrapColumn : 25);
+    while (line.Length() < width) {
+      line.Append(char16_t('-'));
+    }
+    Write(line);
+
+    EnsureVerticalSpace(0);
+  }
+  else if (mFlags & nsIDocumentEncoder::OutputNonTextContentAsPlaceholder) {
+    Write(NS_LITERAL_STRING("\xFFFC"));
+  }
+  else if (aTag == nsGkAtoms::img) {
+    /* Output (in decreasing order of preference)
+       alt, title or nothing */
+    // See <http://www.w3.org/TR/REC-html40/struct/objects.html#edef-IMG>
+    nsAutoString imageDescription;
+    if (NS_SUCCEEDED(GetAttributeValue(nsGkAtoms::alt,
+                                       imageDescription))) {
+      // If the alt attribute has an empty value (|alt=""|), output nothing
+    }
+    else if (NS_SUCCEEDED(GetAttributeValue(nsGkAtoms::title,
+                                            imageDescription))
+             && !imageDescription.IsEmpty()) {
+      imageDescription = NS_LITERAL_STRING(" [") +
+                         imageDescription +
+                         NS_LITERAL_STRING("] ");
+    }
+   
+    Write(imageDescription);
+  }
+
+  return NS_OK;
+}
+
+/**
+ * Adds as many newline as necessary to get |noOfRows| empty lines
+ *
+ * noOfRows = -1    :   Being in the middle of some line of text
+ * noOfRows =  0    :   Being at the start of a line
+ * noOfRows =  n>0  :   Having n empty lines before the current line.
+ */
+void
+nsPlainTextSerializer::EnsureVerticalSpace(int32_t noOfRows)
+{
+  // If we have something in the indent we probably want to output
+  // it and it's not included in the count for empty lines so we don't
+  // realize that we should start a new line.
+  if (noOfRows >= 0 && !mInIndentString.IsEmpty()) {
+    EndLine(false);
+    mInWhitespace = true;
+  }
+
+  while(mEmptyLines < noOfRows) {
+    EndLine(false);
+    mInWhitespace = true;
+  }
+  mLineBreakDue = false;
+  mFloatingLines = -1;
+}
+
+/**
+ * This empties the current line cache without adding a NEWLINE.
+ * Should not be used if line wrapping is of importance since
+ * this function destroys the cache information.
+ *
+ * It will also write indentation and quotes if we believe us to be
+ * at the start of the line.
+ */
+void
+nsPlainTextSerializer::FlushLine()
+{
+  if (!mCurrentLine.IsEmpty()) {
+    if (mAtFirstColumn) {
+      OutputQuotesAndIndent(); // XXX: Should we always do this? Bug?
+    }
+
+    Output(mCurrentLine);
+    mAtFirstColumn = mAtFirstColumn && mCurrentLine.IsEmpty();
+    mCurrentLine.Truncate();
+    mCurrentLineWidth = 0;
+  }
+}
+
+/**
+ * Prints the text to output to our current output device (the string mOutputString).
+ * The only logic here is to replace non breaking spaces with a normal space since
+ * most (all?) receivers of the result won't understand the nbsp and even be
+ * confused by it.
+ */
+void 
+nsPlainTextSerializer::Output(nsString& aString)
+{
+  if (!aString.IsEmpty()) {
+    mStartedOutput = true;
+  }
+
+  if (!(mFlags & nsIDocumentEncoder::OutputPersistNBSP)) {
+    // First, replace all nbsp characters with spaces,
+    // which the unicode encoder won't do for us.
+    aString.ReplaceChar(kNBSP, kSPACE);
+  }
+  mOutputString->Append(aString);
+}
+
+static bool
+IsSpaceStuffable(const char16_t *s)
+{
+  if (s[0] == '>' || s[0] == ' ' || s[0] == kNBSP ||
+      nsCRT::strncmp(s, MOZ_UTF16("From "), 5) == 0)
+    return true;
+  else
+    return false;
+}
+
+/**
+ * This function adds a piece of text to the current stored line. If we are
+ * wrapping text and the stored line will become too long, a suitable
+ * location to wrap will be found and the line that's complete will be
+ * output.
+ */
+void
+nsPlainTextSerializer::AddToLine(const char16_t * aLineFragment, 
+                                 int32_t aLineFragmentLength)
+{
+  uint32_t prefixwidth = (mCiteQuoteLevel > 0 ? mCiteQuoteLevel + 1:0)+mIndent;
+  
+  if (mLineBreakDue)
+    EnsureVerticalSpace(mFloatingLines);
+
+  int32_t linelength = mCurrentLine.Length();
+  if (0 == linelength) {
+    if (0 == aLineFragmentLength) {
+      // Nothing at all. Are you kidding me?
+      return;
+    }
+
+    if (mFlags & nsIDocumentEncoder::OutputFormatFlowed) {
+      if (IsSpaceStuffable(aLineFragment)
+         && mCiteQuoteLevel == 0  // We space-stuff quoted lines anyway
+         )
+        {
+          // Space stuffing a la RFC 2646 (format=flowed).
+          mCurrentLine.Append(char16_t(' '));
+          
+          if (MayWrap()) {
+            mCurrentLineWidth += GetUnicharWidth(' ');
+#ifdef DEBUG_wrapping
+            NS_ASSERTION(GetUnicharStringWidth(mCurrentLine.get(),
+                                               mCurrentLine.Length()) ==
+                         (int32_t)mCurrentLineWidth,
+                         "mCurrentLineWidth and reality out of sync!");
+#endif
+          }
+        }
+    }
+    mEmptyLines=-1;
+  }
+    
+  mCurrentLine.Append(aLineFragment, aLineFragmentLength);
+  if (MayWrap()) {
+    mCurrentLineWidth += GetUnicharStringWidth(aLineFragment,
+                                               aLineFragmentLength);
+#ifdef DEBUG_wrapping
+    NS_ASSERTION(GetUnicharstringWidth(mCurrentLine.get(),
+                                       mCurrentLine.Length()) ==
+                 (int32_t)mCurrentLineWidth,
+                 "mCurrentLineWidth and reality out of sync!");
+#endif
+  }
+
+  linelength = mCurrentLine.Length();
+
+  //  Wrap?
+  if (MayWrap())
+  {
+#ifdef DEBUG_wrapping
+    NS_ASSERTION(GetUnicharstringWidth(mCurrentLine.get(),
+                                  mCurrentLine.Length()) ==
+                 (int32_t)mCurrentLineWidth,
+                 "mCurrentLineWidth and reality out of sync!");
+#endif
+    // Yes, wrap!
+    // The "+4" is to avoid wrap lines that only would be a couple
+    // of letters too long. We give this bonus only if the
+    // wrapcolumn is more than 20.
+    uint32_t bonuswidth = (mWrapColumn > 20) ? 4 : 0;
+
+    // XXX: Should calculate prefixwidth with GetUnicharStringWidth
+    while(mCurrentLineWidth+prefixwidth > mWrapColumn+bonuswidth) {      
+      // We go from the end removing one letter at a time until
+      // we have a reasonable width
+      int32_t goodSpace = mCurrentLine.Length();
+      uint32_t width = mCurrentLineWidth;
+      while(goodSpace > 0 && (width+prefixwidth > mWrapColumn)) {
+        goodSpace--;
+        width -= GetUnicharWidth(mCurrentLine[goodSpace]);
+      }
+
+      goodSpace++;
+      
+      if (mLineBreaker) {
+        goodSpace = mLineBreaker->Prev(mCurrentLine.get(), 
+                                    mCurrentLine.Length(), goodSpace);
+        if (goodSpace != NS_LINEBREAKER_NEED_MORE_TEXT &&
+            nsCRT::IsAsciiSpace(mCurrentLine.CharAt(goodSpace-1))) {
+          --goodSpace;    // adjust the position since line breaker returns a position next to space
+        }
+      }
+      // fallback if the line breaker is unavailable or failed
+      if (!mLineBreaker) {
+        goodSpace = mWrapColumn-prefixwidth;
+        while (goodSpace >= 0 &&
+               !nsCRT::IsAsciiSpace(mCurrentLine.CharAt(goodSpace))) {
+          goodSpace--;
+        }
+      }
+      
+      nsAutoString restOfLine;
+      if (goodSpace == NS_LINEBREAKER_NEED_MORE_TEXT) {
+        // If we don't found a good place to break, accept long line and
+        // try to find another place to break
+        goodSpace=(prefixwidth>mWrapColumn+1)?1:mWrapColumn-prefixwidth+1;
+        if (mLineBreaker) {
+          if ((uint32_t)goodSpace < mCurrentLine.Length())
+            goodSpace = mLineBreaker->Next(mCurrentLine.get(), 
+                                           mCurrentLine.Length(), goodSpace);
+          if (goodSpace == NS_LINEBREAKER_NEED_MORE_TEXT)
+            goodSpace = mCurrentLine.Length();
+        }
+        // fallback if the line breaker is unavailable or failed
+        if (!mLineBreaker) {
+          goodSpace=(prefixwidth>mWrapColumn)?1:mWrapColumn-prefixwidth;
+          while (goodSpace < linelength &&
+                 !nsCRT::IsAsciiSpace(mCurrentLine.CharAt(goodSpace))) {
+            goodSpace++;
+          }
+        }
+      }
+      
+      if ((goodSpace < linelength) && (goodSpace > 0)) {
+        // Found a place to break
+
+        // -1 (trim a char at the break position)
+        // only if the line break was a space.
+        if (nsCRT::IsAsciiSpace(mCurrentLine.CharAt(goodSpace))) {
+          mCurrentLine.Right(restOfLine, linelength-goodSpace-1);
+        }
+        else {
+          mCurrentLine.Right(restOfLine, linelength-goodSpace);
+        }
+        // if breaker was U+0020, it has to consider for delsp=yes support
+        bool breakBySpace = mCurrentLine.CharAt(goodSpace) == ' ';
+        mCurrentLine.Truncate(goodSpace); 
+        EndLine(true, breakBySpace);
+        mCurrentLine.Truncate();
+        // Space stuff new line?
+        if (mFlags & nsIDocumentEncoder::OutputFormatFlowed) {
+          if (!restOfLine.IsEmpty() && IsSpaceStuffable(restOfLine.get())
+              && mCiteQuoteLevel == 0  // We space-stuff quoted lines anyway
+            )
+          {
+            // Space stuffing a la RFC 2646 (format=flowed).
+            mCurrentLine.Append(char16_t(' '));
+            //XXX doesn't seem to work correctly for ' '
+          }
+        }
+        mCurrentLine.Append(restOfLine);
+        mCurrentLineWidth = GetUnicharStringWidth(mCurrentLine.get(),
+                                                  mCurrentLine.Length());
+        linelength = mCurrentLine.Length();
+        mEmptyLines = -1;
+      } 
+      else {
+        // Nothing to do. Hopefully we get more data later
+        // to use for a place to break line
+        break;
+      }
+    }
+  } 
+  else {
+    // No wrapping.
+  }
+}
+
+/**
+ * Outputs the contents of mCurrentLine, and resets line specific
+ * variables. Also adds an indentation and prefix if there is
+ * one specified. Strips ending spaces from the line if it isn't
+ * preformatted.
+ */
+void
+nsPlainTextSerializer::EndLine(bool aSoftlinebreak, bool aBreakBySpace)
+{
+  uint32_t currentlinelength = mCurrentLine.Length();
+
+  if (aSoftlinebreak && 0 == currentlinelength) {
+    // No meaning
+    return;
+  }
+
+  /* In non-preformatted mode, remove spaces from the end of the line for
+   * format=flowed compatibility. Don't do this for these special cases:
+   * "-- ", the signature separator (RFC 2646) shouldn't be touched and
+   * "- -- ", the OpenPGP dash-escaped signature separator in inline
+   * signed messages according to the OpenPGP standard (RFC 2440).
+   */  
+  if (!(mFlags & nsIDocumentEncoder::OutputPreformatted) &&
+      !(mFlags & nsIDocumentEncoder::OutputDontRemoveLineEndingSpaces) &&
+     (aSoftlinebreak || 
+     !(mCurrentLine.EqualsLiteral("-- ") || mCurrentLine.EqualsLiteral("- -- ")))) {
+    // Remove spaces from the end of the line.
+    while(currentlinelength > 0 &&
+          mCurrentLine[currentlinelength-1] == ' ') {
+      --currentlinelength;
+    }
+    mCurrentLine.SetLength(currentlinelength);
+  }
+  
+  if (aSoftlinebreak &&
+     (mFlags & nsIDocumentEncoder::OutputFormatFlowed) &&
+     (mIndent == 0)) {
+    // Add the soft part of the soft linebreak (RFC 2646 4.1)
+    // We only do this when there is no indentation since format=flowed
+    // lines and indentation doesn't work well together.
+
+    // If breaker character is ASCII space with RFC 3676 support (delsp=yes),
+    // add twice space.
+    if ((mFlags & nsIDocumentEncoder::OutputFormatDelSp) && aBreakBySpace)
+      mCurrentLine.Append(NS_LITERAL_STRING("  "));
+    else
+      mCurrentLine.Append(char16_t(' '));
+  }
+
+  if (aSoftlinebreak) {
+    mEmptyLines=0;
+  } 
+  else {
+    // Hard break
+    if (!mCurrentLine.IsEmpty() || !mInIndentString.IsEmpty()) {
+      mEmptyLines=-1;
+    }
+
+    mEmptyLines++;
+  }
+
+  if (mAtFirstColumn) {
+    // If we don't have anything "real" to output we have to
+    // make sure the indent doesn't end in a space since that
+    // would trick a format=flowed-aware receiver.
+    bool stripTrailingSpaces = mCurrentLine.IsEmpty();
+    OutputQuotesAndIndent(stripTrailingSpaces);
+  }
+
+  mCurrentLine.Append(mLineBreak);
+  Output(mCurrentLine);
+  mCurrentLine.Truncate();
+  mCurrentLineWidth = 0;
+  mAtFirstColumn=true;
+  mInWhitespace=true;
+  mLineBreakDue = false;
+  mFloatingLines = -1;
+}
+
+
+/**
+ * Outputs the calculated and stored indent and text in the indentation. That is
+ * quote chars and numbers for numbered lists and such. It will also reset any
+ * stored text to put in the indentation after using it.
+ */
+void
+nsPlainTextSerializer::OutputQuotesAndIndent(bool stripTrailingSpaces /* = false */)
+{
+  nsAutoString stringToOutput;
+  
+  // Put the mail quote "> " chars in, if appropriate:
+  if (mCiteQuoteLevel > 0) {
+    nsAutoString quotes;
+    for(int i=0; i < mCiteQuoteLevel; i++) {
+      quotes.Append(char16_t('>'));
+    }
+    if (!mCurrentLine.IsEmpty()) {
+      /* Better don't output a space here, if the line is empty,
+         in case a receiving f=f-aware UA thinks, this were a flowed line,
+         which it isn't - it's just empty.
+         (Flowed lines may be joined with the following one,
+         so the empty line may be lost completely.) */
+      quotes.Append(char16_t(' '));
+    }
+    stringToOutput = quotes;
+    mAtFirstColumn = false;
+  }
+  
+  // Indent if necessary
+  int32_t indentwidth = mIndent - mInIndentString.Length();
+  if (indentwidth > 0
+      && (!mCurrentLine.IsEmpty() || !mInIndentString.IsEmpty())
+      // Don't make empty lines look flowed
+      ) {
+    nsAutoString spaces;
+    for (int i=0; i < indentwidth; ++i)
+      spaces.Append(char16_t(' '));
+    stringToOutput += spaces;
+    mAtFirstColumn = false;
+  }
+  
+  if (!mInIndentString.IsEmpty()) {
+    stringToOutput += mInIndentString;
+    mAtFirstColumn = false;
+    mInIndentString.Truncate();
+  }
+
+  if (stripTrailingSpaces) {
+    int32_t lineLength = stringToOutput.Length();
+    while(lineLength > 0 &&
+          ' ' == stringToOutput[lineLength-1]) {
+      --lineLength;
+    }
+    stringToOutput.SetLength(lineLength);
+  }
+
+  if (!stringToOutput.IsEmpty()) {
+    Output(stringToOutput);
+  }
+    
+}
+
+/**
+ * Write a string. This is the highlevel function to use to get text output.
+ * By using AddToLine, Output, EndLine and other functions it handles quotation,
+ * line wrapping, indentation, whitespace compression and other things.
+ */
+void
+nsPlainTextSerializer::Write(const nsAString& aStr)
+{
+  // XXX Copy necessary to use nsString methods and gain
+  // access to underlying buffer
+  nsAutoString str(aStr);
+
+#ifdef DEBUG_wrapping
+  printf("Write(%s): wrap col = %d\n",
+         NS_ConvertUTF16toUTF8(str).get(), mWrapColumn);
+#endif
+
+  int32_t bol = 0;
+  int32_t newline;
+  
+  int32_t totLen = str.Length();
+
+  // If the string is empty, do nothing:
+  if (totLen <= 0) return;
+
+  // For Flowed text change nbsp-ses to spaces at end of lines to allow them
+  // to be cut off along with usual spaces if required. (bug #125928)
+  if (mFlags & nsIDocumentEncoder::OutputFormatFlowed) {
+    for (int32_t i = totLen-1; i >= 0; i--) {
+      char16_t c = str[i];
+      if ('\n' == c || '\r' == c || ' ' == c || '\t' == c)
+        continue;
+      if (kNBSP == c)
+        str.Replace(i, 1, ' ');
+      else
+        break;
+    }
+  }
+
+  // We have two major codepaths here. One that does preformatted text and one
+  // that does normal formatted text. The one for preformatted text calls
+  // Output directly while the other code path goes through AddToLine.
+  if ((mPreFormatted && !mWrapColumn) || IsInPre()
+      || ((mSpanLevel > 0 || mDontWrapAnyQuotes)
+          && mEmptyLines >= 0 && str.First() == char16_t('>'))) {
+    // No intelligent wrapping.
+
+    // This mustn't be mixed with intelligent wrapping without clearing
+    // the mCurrentLine buffer before!!!
+    NS_ASSERTION(mCurrentLine.IsEmpty(),
+                 "Mixed wrapping data and nonwrapping data on the same line");
+    if (!mCurrentLine.IsEmpty()) {
+      FlushLine();
+    }
+
+    // Put the mail quote "> " chars in, if appropriate.
+    // Have to put it in before every line.
+    while(bol<totLen) {
+      bool outputQuotes = mAtFirstColumn;
+      bool atFirstColumn = mAtFirstColumn;
+      bool outputLineBreak = false;
+      bool spacesOnly = true;
+
+      // Find one of '\n' or '\r' using iterators since nsAString
+      // doesn't have the old FindCharInSet function.
+      nsAString::const_iterator iter;           str.BeginReading(iter);
+      nsAString::const_iterator done_searching; str.EndReading(done_searching);
+      iter.advance(bol); 
+      int32_t new_newline = bol;
+      newline = kNotFound;
+      while(iter != done_searching) {
+        if ('\n' == *iter || '\r' == *iter) {
+          newline = new_newline;
+          break;
+        }
+        if (' ' != *iter)
+          spacesOnly = false;
+        ++new_newline;
+        ++iter;
+      }
+
+      // Done searching
+      nsAutoString stringpart;
+      if (newline == kNotFound) {
+        // No new lines.
+        stringpart.Assign(Substring(str, bol, totLen - bol));
+        if (!stringpart.IsEmpty()) {
+          char16_t lastchar = stringpart[stringpart.Length()-1];
+          if ((lastchar == '\t') || (lastchar == ' ') ||
+             (lastchar == '\r') ||(lastchar == '\n')) {
+            mInWhitespace = true;
+          } 
+          else {
+            mInWhitespace = false;
+          }
+        }
+        mEmptyLines=-1;
+        atFirstColumn = mAtFirstColumn && (totLen-bol)==0;
+        bol = totLen;
+      } 
+      else {
+        // There is a newline
+        stringpart.Assign(Substring(str, bol, newline-bol));
+        mInWhitespace = true;
+        outputLineBreak = true;
+        mEmptyLines=0;
+        atFirstColumn = true;
+        bol = newline+1;
+        if ('\r' == *iter && bol < totLen && '\n' == *++iter) {
+          // There was a CRLF in the input. This used to be illegal and
+          // stripped by the parser. Apparently not anymore. Let's skip
+          // over the LF.
+          bol++;
+        }
+      }
+
+      mCurrentLine.AssignLiteral("");
+      if (mFlags & nsIDocumentEncoder::OutputFormatFlowed) {
+        if ((outputLineBreak || !spacesOnly) && // bugs 261467,125928
+            !stringpart.EqualsLiteral("-- ") &&
+            !stringpart.EqualsLiteral("- -- "))
+          stringpart.Trim(" ", false, true, true);
+        if (IsSpaceStuffable(stringpart.get()) && stringpart[0] != '>')
+          mCurrentLine.Append(char16_t(' '));
+      }
+      mCurrentLine.Append(stringpart);
+
+      if (outputQuotes) {
+        // Note: this call messes with mAtFirstColumn
+        OutputQuotesAndIndent();
+      }
+
+      Output(mCurrentLine);
+      if (outputLineBreak) {
+        Output(mLineBreak);
+      }
+      mAtFirstColumn = atFirstColumn;
+    }
+
+    // Reset mCurrentLine.
+    mCurrentLine.Truncate();
+
+#ifdef DEBUG_wrapping
+    printf("No wrapping: newline is %d, totLen is %d\n",
+           newline, totLen);
+#endif
+    return;
+  }
+
+  // Intelligent handling of text
+  // If needed, strip out all "end of lines"
+  // and multiple whitespace between words
+  int32_t nextpos;
+  const char16_t * offsetIntoBuffer = nullptr;
+  
+  while (bol < totLen) {    // Loop over lines
+    // Find a place where we may have to do whitespace compression
+    nextpos = str.FindCharInSet(" \t\n\r", bol);
+#ifdef DEBUG_wrapping
+    nsAutoString remaining;
+    str.Right(remaining, totLen - bol);
+    foo = ToNewCString(remaining);
+    //    printf("Next line: bol = %d, newlinepos = %d, totLen = %d, string = '%s'\n",
+    //           bol, nextpos, totLen, foo);
+    nsMemory::Free(foo);
+#endif
+
+    if (nextpos == kNotFound) {
+      // The rest of the string
+      offsetIntoBuffer = str.get() + bol;
+      AddToLine(offsetIntoBuffer, totLen-bol);
+      bol=totLen;
+      mInWhitespace=false;
+    } 
+    else {
+      // There's still whitespace left in the string
+      if (nextpos != 0 && (nextpos + 1) < totLen) {
+        offsetIntoBuffer = str.get() + nextpos;
+        // skip '\n' if it is between CJ chars
+        if (offsetIntoBuffer[0] == '\n' && IS_CJ_CHAR(offsetIntoBuffer[-1]) && IS_CJ_CHAR(offsetIntoBuffer[1])) {
+          offsetIntoBuffer = str.get() + bol;
+          AddToLine(offsetIntoBuffer, nextpos-bol);
+          bol = nextpos + 1;
+          continue;
+        }
+      }
+      // If we're already in whitespace and not preformatted, just skip it:
+      if (mInWhitespace && (nextpos == bol) && !mPreFormatted &&
+          !(mFlags & nsIDocumentEncoder::OutputPreformatted)) {
+        // Skip whitespace
+        bol++;
+        continue;
+      }
+
+      if (nextpos == bol) {
+        // Note that we are in whitespace.
+        mInWhitespace = true;
+        offsetIntoBuffer = str.get() + nextpos;
+        AddToLine(offsetIntoBuffer, 1);
+        bol++;
+        continue;
+      }
+      
+      mInWhitespace = true;
+      
+      offsetIntoBuffer = str.get() + bol;
+      if (mPreFormatted || (mFlags & nsIDocumentEncoder::OutputPreformatted)) {
+        // Preserve the real whitespace character
+        nextpos++;
+        AddToLine(offsetIntoBuffer, nextpos-bol);
+        bol = nextpos;
+      } 
+      else {
+        // Replace the whitespace with a space
+        AddToLine(offsetIntoBuffer, nextpos-bol);
+        AddToLine(kSpace.get(),1);
+        bol = nextpos + 1; // Let's eat the whitespace
+      }
+    }
+  } // Continue looping over the string
+}
+
+
+/**
+ * Gets the value of an attribute in a string. If the function returns
+ * NS_ERROR_NOT_AVAILABLE, there was none such attribute specified.
+ */
+nsresult
+nsPlainTextSerializer::GetAttributeValue(nsIAtom* aName,
+                                         nsString& aValueRet)
+{
+  if (mElement) {
+    if (mElement->GetAttr(kNameSpaceID_None, aName, aValueRet)) {
+      return NS_OK;
+    }
+  }
+
+  return NS_ERROR_NOT_AVAILABLE;
+}
+
+/**
+ * Returns true, if the element was inserted by Moz' TXT->HTML converter.
+ * In this case, we should ignore it.
+ */
+bool 
+nsPlainTextSerializer::IsCurrentNodeConverted()
+{
+  nsAutoString value;
+  nsresult rv = GetAttributeValue(nsGkAtoms::_class, value);
+  return (NS_SUCCEEDED(rv) &&
+          (value.EqualsIgnoreCase("moz-txt", 7) ||
+           value.EqualsIgnoreCase("\"moz-txt", 8)));
+}
+
+
+// static
+nsIAtom*
+nsPlainTextSerializer::GetIdForContent(nsIContent* aContent)
+{
+  if (!aContent->IsHTML()) {
+    return nullptr;
+  }
+
+  nsIAtom* localName = aContent->Tag();
+  return localName->IsStaticAtom() ? localName : nullptr;
+}
+
+/**
+ * Returns true if we currently are inside a <pre>. The check is done
+ * by traversing the tag stack looking for <pre> until we hit a block
+ * level tag which is assumed to override any <pre>:s below it in
+ * the stack. To do this correctly to a 100% would require access
+ * to style which we don't support in this converter.
+ */  
+bool
+nsPlainTextSerializer::IsInPre()
+{
+  int32_t i = mTagStackIndex;
+  while(i > 0) {
+    if (mTagStack[i - 1] == nsGkAtoms::pre)
+      return true;
+    if (nsContentUtils::IsHTMLBlock(mTagStack[i - 1])) {
+      // We assume that every other block overrides a <pre>
+      return false;
+    }
+    --i;
+  }
+
+  // Not a <pre> in the whole stack
+  return false;
+}
+
+/**
+ * This method is required only to identify LI's inside OL.
+ * Returns TRUE if we are inside an OL tag and FALSE otherwise.
+ */
+bool
+nsPlainTextSerializer::IsInOL()
+{
+  int32_t i = mTagStackIndex;
+  while(--i >= 0) {
+    if (mTagStack[i] == nsGkAtoms::ol)
+      return true;
+    if (mTagStack[i] == nsGkAtoms::ul) {
+      // If a UL is reached first, LI belongs the UL nested in OL.
+      return false;
+    }
+  }
+  // We may reach here for orphan LI's.
+  return false;
+}
+
+/*
+  @return 0 = no header, 1 = h1, ..., 6 = h6
+*/
+int32_t HeaderLevel(nsIAtom* aTag)
+{
+  if (aTag == nsGkAtoms::h1) {
+    return 1;
+  }
+  if (aTag == nsGkAtoms::h2) {
+    return 2;
+  }
+  if (aTag == nsGkAtoms::h3) {
+    return 3;
+  }
+  if (aTag == nsGkAtoms::h4) {
+    return 4;
+  }
+  if (aTag == nsGkAtoms::h5) {
+    return 5;
+  }
+  if (aTag == nsGkAtoms::h6) {
+    return 6;
+  }
+  return 0;
+}
+
+
+/*
+ * This is an implementation of GetUnicharWidth() and
+ * GetUnicharStringWidth() as defined in
+ * "The Single UNIX Specification, Version 2, The Open Group, 1997"
+ * <http://www.UNIX-systems.org/online.html>
+ *
+ * Markus Kuhn -- 2000-02-08 -- public domain
+ *
+ * Minor alterations to fit Mozilla's data types by Daniel Bratell
+ */
+
+/* These functions define the column width of an ISO 10646 character
+ * as follows:
+ *
+ *    - The null character (U+0000) has a column width of 0.
+ *
+ *    - Other C0/C1 control characters and DEL will lead to a return
+ *      value of -1.
+ *
+ *    - Non-spacing and enclosing combining characters (general
+ *      category code Mn or Me in the Unicode database) have a
+ *      column width of 0.
+ *
+ *    - Spacing characters in the East Asian Wide (W) or East Asian
+ *      FullWidth (F) category as defined in Unicode Technical
+ *      Report #11 have a column width of 2.
+ *
+ *    - All remaining characters (including all printable
+ *      ISO 8859-1 and WGL4 characters, Unicode control characters,
+ *      etc.) have a column width of 1.
+ *
+ * This implementation assumes that wchar_t characters are encoded
+ * in ISO 10646.
+ */
+
+int32_t GetUnicharWidth(char16_t ucs)
+{
+  /* sorted list of non-overlapping intervals of non-spacing characters */
+  static const struct interval {
+    uint16_t first;
+    uint16_t last;
+  } combining[] = {
+    { 0x0300, 0x034E }, { 0x0360, 0x0362 }, { 0x0483, 0x0486 },
+    { 0x0488, 0x0489 }, { 0x0591, 0x05A1 }, { 0x05A3, 0x05B9 },
+    { 0x05BB, 0x05BD }, { 0x05BF, 0x05BF }, { 0x05C1, 0x05C2 },
+    { 0x05C4, 0x05C4 }, { 0x064B, 0x0655 }, { 0x0670, 0x0670 },
+    { 0x06D6, 0x06E4 }, { 0x06E7, 0x06E8 }, { 0x06EA, 0x06ED },
+    { 0x0711, 0x0711 }, { 0x0730, 0x074A }, { 0x07A6, 0x07B0 },
+    { 0x0901, 0x0902 }, { 0x093C, 0x093C }, { 0x0941, 0x0948 },
+    { 0x094D, 0x094D }, { 0x0951, 0x0954 }, { 0x0962, 0x0963 },
+    { 0x0981, 0x0981 }, { 0x09BC, 0x09BC }, { 0x09C1, 0x09C4 },
+    { 0x09CD, 0x09CD }, { 0x09E2, 0x09E3 }, { 0x0A02, 0x0A02 },
+    { 0x0A3C, 0x0A3C }, { 0x0A41, 0x0A42 }, { 0x0A47, 0x0A48 },
+    { 0x0A4B, 0x0A4D }, { 0x0A70, 0x0A71 }, { 0x0A81, 0x0A82 },
+    { 0x0ABC, 0x0ABC }, { 0x0AC1, 0x0AC5 }, { 0x0AC7, 0x0AC8 },
+    { 0x0ACD, 0x0ACD }, { 0x0B01, 0x0B01 }, { 0x0B3C, 0x0B3C },
+    { 0x0B3F, 0x0B3F }, { 0x0B41, 0x0B43 }, { 0x0B4D, 0x0B4D },
+    { 0x0B56, 0x0B56 }, { 0x0B82, 0x0B82 }, { 0x0BC0, 0x0BC0 },
+    { 0x0BCD, 0x0BCD }, { 0x0C3E, 0x0C40 }, { 0x0C46, 0x0C48 },
+    { 0x0C4A, 0x0C4D }, { 0x0C55, 0x0C56 }, { 0x0CBF, 0x0CBF },
+    { 0x0CC6, 0x0CC6 }, { 0x0CCC, 0x0CCD }, { 0x0D41, 0x0D43 },
+    { 0x0D4D, 0x0D4D }, { 0x0DCA, 0x0DCA }, { 0x0DD2, 0x0DD4 },
+    { 0x0DD6, 0x0DD6 }, { 0x0E31, 0x0E31 }, { 0x0E34, 0x0E3A },
+    { 0x0E47, 0x0E4E }, { 0x0EB1, 0x0EB1 }, { 0x0EB4, 0x0EB9 },
+    { 0x0EBB, 0x0EBC }, { 0x0EC8, 0x0ECD }, { 0x0F18, 0x0F19 },
+    { 0x0F35, 0x0F35 }, { 0x0F37, 0x0F37 }, { 0x0F39, 0x0F39 },
+    { 0x0F71, 0x0F7E }, { 0x0F80, 0x0F84 }, { 0x0F86, 0x0F87 },
+    { 0x0F90, 0x0F97 }, { 0x0F99, 0x0FBC }, { 0x0FC6, 0x0FC6 },
+    { 0x102D, 0x1030 }, { 0x1032, 0x1032 }, { 0x1036, 0x1037 },
+    { 0x1039, 0x1039 }, { 0x1058, 0x1059 }, { 0x17B7, 0x17BD },
+    { 0x17C6, 0x17C6 }, { 0x17C9, 0x17D3 }, { 0x18A9, 0x18A9 },
+    { 0x20D0, 0x20E3 }, { 0x302A, 0x302F }, { 0x3099, 0x309A },
+    { 0xFB1E, 0xFB1E }, { 0xFE20, 0xFE23 }
+  };
+  int32_t min = 0;
+  int32_t max = sizeof(combining) / sizeof(struct interval) - 1;
+  int32_t mid;
+
+  /* test for 8-bit control characters */
+  if (ucs == 0)
+    return 0;
+  if (ucs < 32 || (ucs >= 0x7f && ucs < 0xa0))
+    return -1;
+
+  /* first quick check for Latin-1 etc. characters */
+  if (ucs < combining[0].first)
+    return 1;
+
+  /* binary search in table of non-spacing characters */
+  while (max >= min) {
+    mid = (min + max) / 2;
+    if (combining[mid].last < ucs)
+      min = mid + 1;
+    else if (combining[mid].first > ucs)
+      max = mid - 1;
+    else if (combining[mid].first <= ucs && combining[mid].last >= ucs)
+      return 0;
+  }
+
+  /* if we arrive here, ucs is not a combining or C0/C1 control character */
+
+  /* fast test for majority of non-wide scripts */
+  if (ucs < 0x1100)
+    return 1;
+
+  return 1 +
+    ((ucs >= 0x1100 && ucs <= 0x115f) || /* Hangul Jamo */
+     (ucs >= 0x2e80 && ucs <= 0xa4cf && (ucs & ~0x0011) != 0x300a &&
+      ucs != 0x303f) ||                  /* CJK ... Yi */
+     (ucs >= 0xac00 && ucs <= 0xd7a3) || /* Hangul Syllables */
+     (ucs >= 0xf900 && ucs <= 0xfaff) || /* CJK Compatibility Ideographs */
+     (ucs >= 0xfe30 && ucs <= 0xfe6f) || /* CJK Compatibility Forms */
+     (ucs >= 0xff00 && ucs <= 0xff5f) || /* Fullwidth Forms */
+     (ucs >= 0xffe0 && ucs <= 0xffe6));
+}
+
+
+int32_t GetUnicharStringWidth(const char16_t* pwcs, int32_t n)
+{
+  int32_t w, width = 0;
+
+  for (;*pwcs && n-- > 0; pwcs++)
+    if ((w = GetUnicharWidth(*pwcs)) < 0)
+      ++width; // Taking 1 as the width of non-printable character, for bug# 94475.
+    else
+      width += w;
+
+  return width;
+}
+