Adding upstream version 110.0.1.upstream/110.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1281 insertions, 0 deletions

diff --git a/netwerk/streamconv/converters/mozTXTToHTMLConv.cpp b/netwerk/streamconv/converters/mozTXTToHTMLConv.cpp
new file mode 100644
index 0000000000..59e378b499
--- /dev/null
+++ b/netwerk/streamconv/converters/mozTXTToHTMLConv.cpp
@@ -0,0 +1,1281 @@
+/* -*- 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 "mozilla/TextUtils.h"
+#include "mozTXTToHTMLConv.h"
+#include "mozilla/intl/Segmenter.h"
+#include "mozilla/Maybe.h"
+#include "nsNetUtil.h"
+#include "nsUnicharUtils.h"
+#include "nsUnicodeProperties.h"
+#include "nsCRT.h"
+#include "nsIExternalProtocolHandler.h"
+#include "nsIURI.h"
+
+#include <algorithm>
+
+#ifdef DEBUG_BenB_Perf
+#  include "prtime.h"
+#  include "prinrval.h"
+#endif
+
+using mozilla::IsAscii;
+using mozilla::IsAsciiAlpha;
+using mozilla::IsAsciiDigit;
+using mozilla::Maybe;
+using mozilla::Some;
+using mozilla::Span;
+using mozilla::intl::GraphemeClusterBreakIteratorUtf16;
+using mozilla::intl::GraphemeClusterBreakReverseIteratorUtf16;
+
+const double growthRate = 1.2;
+
+// Bug 183111, editor now replaces multiple spaces with leading
+// 0xA0's and a single ending space, so need to treat 0xA0's as spaces.
+// 0xA0 is the Latin1/Unicode character for "non-breaking space (nbsp)"
+// Also recognize the Japanese ideographic space 0x3000 as a space.
+static inline bool IsSpace(const char16_t aChar) {
+  return (nsCRT::IsAsciiSpace(aChar) || aChar == 0xA0 || aChar == 0x3000);
+}
+
+// Escape Char will take ch, escape it and append the result to
+// aStringToAppendTo
+void mozTXTToHTMLConv::EscapeChar(const char16_t ch,
+                                  nsAString& aStringToAppendTo,
+                                  bool inAttribute) {
+  switch (ch) {
+    case '<':
+      aStringToAppendTo.AppendLiteral("&lt;");
+      break;
+    case '>':
+      aStringToAppendTo.AppendLiteral("&gt;");
+      break;
+    case '&':
+      aStringToAppendTo.AppendLiteral("&amp;");
+      break;
+    case '"':
+      if (inAttribute) {
+        aStringToAppendTo.AppendLiteral("&quot;");
+        break;
+      }
+      // else fall through
+      [[fallthrough]];
+    default:
+      aStringToAppendTo += ch;
+  }
+}
+
+// EscapeStr takes the passed in string and
+// escapes it IN PLACE.
+void mozTXTToHTMLConv::EscapeStr(nsString& aInString, bool inAttribute) {
+  // the replace substring routines
+  // don't seem to work if you have a character
+  // in the in string that is also in the replacement
+  // string! =(
+  // aInString.ReplaceSubstring("&", "&amp;");
+  // aInString.ReplaceSubstring("<", "&lt;");
+  // aInString.ReplaceSubstring(">", "&gt;");
+  for (uint32_t i = 0; i < aInString.Length();) {
+    switch (aInString[i]) {
+      case '<':
+        aInString.Cut(i, 1);
+        aInString.InsertLiteral(u"&lt;", i);
+        i += 4;  // skip past the integers we just added
+        break;
+      case '>':
+        aInString.Cut(i, 1);
+        aInString.InsertLiteral(u"&gt;", i);
+        i += 4;  // skip past the integers we just added
+        break;
+      case '&':
+        aInString.Cut(i, 1);
+        aInString.InsertLiteral(u"&amp;", i);
+        i += 5;  // skip past the integers we just added
+        break;
+      case '"':
+        if (inAttribute) {
+          aInString.Cut(i, 1);
+          aInString.InsertLiteral(u"&quot;", i);
+          i += 6;
+          break;
+        }
+        // else fall through
+        [[fallthrough]];
+      default:
+        i++;
+    }
+  }
+}
+
+void mozTXTToHTMLConv::UnescapeStr(const char16_t* aInString, int32_t aStartPos,
+                                   int32_t aLength, nsString& aOutString) {
+  const char16_t* subString = nullptr;
+  for (uint32_t i = aStartPos; int32_t(i) - aStartPos < aLength;) {
+    int32_t remainingChars = i - aStartPos;
+    if (aInString[i] == '&') {
+      subString = &aInString[i];
+      if (!NS_strncmp(subString, u"&lt;",
+                      std::min(4, aLength - remainingChars))) {
+        aOutString.Append(char16_t('<'));
+        i += 4;
+      } else if (!NS_strncmp(subString, u"&gt;",
+                             std::min(4, aLength - remainingChars))) {
+        aOutString.Append(char16_t('>'));
+        i += 4;
+      } else if (!NS_strncmp(subString, u"&amp;",
+                             std::min(5, aLength - remainingChars))) {
+        aOutString.Append(char16_t('&'));
+        i += 5;
+      } else if (!NS_strncmp(subString, u"&quot;",
+                             std::min(6, aLength - remainingChars))) {
+        aOutString.Append(char16_t('"'));
+        i += 6;
+      } else {
+        aOutString += aInString[i];
+        i++;
+      }
+    } else {
+      aOutString += aInString[i];
+      i++;
+    }
+  }
+}
+
+void mozTXTToHTMLConv::CompleteAbbreviatedURL(const char16_t* aInString,
+                                              int32_t aInLength,
+                                              const uint32_t pos,
+                                              nsString& aOutString) {
+  NS_ASSERTION(int32_t(pos) < aInLength,
+               "bad args to CompleteAbbreviatedURL, see bug #190851");
+  if (int32_t(pos) >= aInLength) return;
+
+  if (aInString[pos] == '@') {
+    // only pre-pend a mailto url if the string contains a .domain in it..
+    // i.e. we want to linkify johndoe@foo.com but not "let's meet @8pm"
+    nsDependentString inString(aInString, aInLength);
+    if (inString.FindChar('.', pos) !=
+        kNotFound)  // if we have a '.' after the @ sign....
+    {
+      aOutString.AssignLiteral("mailto:");
+      aOutString += aInString;
+    }
+  } else if (aInString[pos] == '.') {
+    if (ItMatchesDelimited(aInString, aInLength, u"www.", 4, LT_IGNORE,
+                           LT_IGNORE)) {
+      aOutString.AssignLiteral("http://");
+      aOutString += aInString;
+    } else if (ItMatchesDelimited(aInString, aInLength, u"ftp.", 4, LT_IGNORE,
+                                  LT_IGNORE)) {
+      aOutString.AssignLiteral("ftp://");
+      aOutString += aInString;
+    }
+  }
+}
+
+bool mozTXTToHTMLConv::FindURLStart(const char16_t* aInString,
+                                    int32_t aInLength, const uint32_t pos,
+                                    const modetype check, uint32_t& start) {
+  switch (check) {  // no breaks, because end of blocks is never reached
+    case RFC1738: {
+      if (!NS_strncmp(&aInString[std::max(int32_t(pos - 4), 0)], u"<URL:", 5)) {
+        start = pos + 1;
+        return true;
+      }
+      return false;
+    }
+    case RFC2396E: {
+      nsString temp(aInString, aInLength);
+      int32_t i = pos <= 0 ? kNotFound : temp.RFindCharInSet(u"<>\"", pos - 1);
+      if (i != kNotFound &&
+          (temp[uint32_t(i)] == '<' || temp[uint32_t(i)] == '"')) {
+        start = uint32_t(++i);
+        return start < pos;
+      }
+      return false;
+    }
+    case freetext: {
+      int32_t i = pos - 1;
+      for (; i >= 0 &&
+             (IsAsciiAlpha(aInString[uint32_t(i)]) ||
+              IsAsciiDigit(aInString[uint32_t(i)]) ||
+              aInString[uint32_t(i)] == '+' || aInString[uint32_t(i)] == '-' ||
+              aInString[uint32_t(i)] == '.');
+           i--) {
+        ;
+      }
+      if (++i >= 0 && uint32_t(i) < pos &&
+          IsAsciiAlpha(aInString[uint32_t(i)])) {
+        start = uint32_t(i);
+        return true;
+      }
+      return false;
+    }
+    case abbreviated: {
+      int32_t i = pos - 1;
+      // This disallows non-ascii-characters for email.
+      // Currently correct, but revisit later after standards changed.
+      bool isEmail = aInString[pos] == (char16_t)'@';
+      // These chars mark the start of the URL
+      for (; i >= 0 && aInString[uint32_t(i)] != '>' &&
+             aInString[uint32_t(i)] != '<' && aInString[uint32_t(i)] != '"' &&
+             aInString[uint32_t(i)] != '\'' && aInString[uint32_t(i)] != '`' &&
+             aInString[uint32_t(i)] != ',' && aInString[uint32_t(i)] != '{' &&
+             aInString[uint32_t(i)] != '[' && aInString[uint32_t(i)] != '(' &&
+             aInString[uint32_t(i)] != '|' && aInString[uint32_t(i)] != '\\' &&
+             !IsSpace(aInString[uint32_t(i)]) &&
+             (!isEmail || IsAscii(aInString[uint32_t(i)])) &&
+             (!isEmail || aInString[uint32_t(i)] != ')');
+           i--) {
+        ;
+      }
+      if (++i >= 0 && uint32_t(i) < pos &&
+          (IsAsciiAlpha(aInString[uint32_t(i)]) ||
+           IsAsciiDigit(aInString[uint32_t(i)]))) {
+        start = uint32_t(i);
+        return true;
+      }
+      return false;
+    }
+    default:
+      return false;
+  }  // switch
+}
+
+bool mozTXTToHTMLConv::FindURLEnd(const char16_t* aInString,
+                                  int32_t aInStringLength, const uint32_t pos,
+                                  const modetype check, const uint32_t start,
+                                  uint32_t& end) {
+  switch (check) {  // no breaks, because end of blocks is never reached
+    case RFC1738:
+    case RFC2396E: {
+      nsString temp(aInString, aInStringLength);
+
+      int32_t i = temp.FindCharInSet(u"<>\"", pos + 1);
+      if (i != kNotFound &&
+          temp[uint32_t(i--)] ==
+              (check == RFC1738 || temp[start - 1] == '<' ? '>' : '"')) {
+        end = uint32_t(i);
+        return end > pos;
+      }
+      return false;
+    }
+    case freetext:
+    case abbreviated: {
+      uint32_t i = pos + 1;
+      bool isEmail = aInString[pos] == (char16_t)'@';
+      bool seenOpeningParenthesis = false;  // there is a '(' earlier in the URL
+      bool seenOpeningSquareBracket =
+          false;  // there is a '[' earlier in the URL
+      for (; int32_t(i) < aInStringLength; i++) {
+        // These chars mark the end of the URL
+        if (aInString[i] == '>' || aInString[i] == '<' || aInString[i] == '"' ||
+            aInString[i] == '`' || aInString[i] == '}' || aInString[i] == '{' ||
+            (aInString[i] == ')' && !seenOpeningParenthesis) ||
+            (aInString[i] == ']' && !seenOpeningSquareBracket) ||
+            // Allow IPv6 adresses like http://[1080::8:800:200C:417A]/foo.
+            (aInString[i] == '[' && i > 2 &&
+             (aInString[i - 1] != '/' || aInString[i - 2] != '/')) ||
+            IsSpace(aInString[i])) {
+          break;
+        }
+        // Disallow non-ascii-characters for email.
+        // Currently correct, but revisit later after standards changed.
+        if (isEmail && (aInString[i] == '(' || aInString[i] == '\'' ||
+                        !IsAscii(aInString[i]))) {
+          break;
+        }
+        if (aInString[i] == '(') seenOpeningParenthesis = true;
+        if (aInString[i] == '[') seenOpeningSquareBracket = true;
+      }
+      // These chars are allowed in the middle of the URL, but not at end.
+      // Technically they are, but are used in normal text after the URL.
+      while (--i > pos && (aInString[i] == '.' || aInString[i] == ',' ||
+                           aInString[i] == ';' || aInString[i] == '!' ||
+                           aInString[i] == '?' || aInString[i] == '-' ||
+                           aInString[i] == ':' || aInString[i] == '\'')) {
+        ;
+      }
+      if (i > pos) {
+        end = i;
+        return true;
+      }
+      return false;
+    }
+    default:
+      return false;
+  }  // switch
+}
+
+void mozTXTToHTMLConv::CalculateURLBoundaries(
+    const char16_t* aInString, int32_t aInStringLength, const uint32_t pos,
+    const uint32_t whathasbeendone, const modetype check, const uint32_t start,
+    const uint32_t end, nsString& txtURL, nsString& desc,
+    int32_t& replaceBefore, int32_t& replaceAfter) {
+  uint32_t descstart = start;
+  switch (check) {
+    case RFC1738: {
+      descstart = start - 5;
+      desc.Append(&aInString[descstart],
+                  end - descstart + 2);  // include "<URL:" and ">"
+      replaceAfter = end - pos + 1;
+    } break;
+    case RFC2396E: {
+      descstart = start - 1;
+      desc.Append(&aInString[descstart],
+                  end - descstart + 2);  // include brackets
+      replaceAfter = end - pos + 1;
+    } break;
+    case freetext:
+    case abbreviated: {
+      descstart = start;
+      desc.Append(&aInString[descstart],
+                  end - start + 1);  // don't include brackets
+      replaceAfter = end - pos;
+    } break;
+    default:
+      break;
+  }  // switch
+
+  EscapeStr(desc, false);
+
+  txtURL.Append(&aInString[start], end - start + 1);
+  txtURL.StripWhitespace();
+
+  // FIX ME
+  nsAutoString temp2;
+  ScanTXT(nsDependentSubstring(&aInString[descstart], pos - descstart),
+          ~kURLs /*prevents loop*/ & whathasbeendone, temp2);
+  replaceBefore = temp2.Length();
+}
+
+bool mozTXTToHTMLConv::ShouldLinkify(const nsCString& aURL) {
+  if (!mIOService) return false;
+
+  nsAutoCString scheme;
+  nsresult rv = mIOService->ExtractScheme(aURL, scheme);
+  if (NS_FAILED(rv)) return false;
+
+  if (scheme == "http" || scheme == "https" || scheme == "mailto") {
+    return true;
+  }
+
+  // Get the handler for this scheme.
+  nsCOMPtr<nsIProtocolHandler> handler;
+  rv = mIOService->GetProtocolHandler(scheme.get(), getter_AddRefs(handler));
+  if (NS_FAILED(rv)) return false;
+
+  // Is it an external protocol handler? If not, linkify it.
+  nsCOMPtr<nsIExternalProtocolHandler> externalHandler =
+      do_QueryInterface(handler);
+  if (!externalHandler) return true;  // handler is built-in, linkify it!
+
+  // If external app exists for the scheme then linkify it.
+  bool exists;
+  rv = externalHandler->ExternalAppExistsForScheme(scheme, &exists);
+  return (NS_SUCCEEDED(rv) && exists);
+}
+
+bool mozTXTToHTMLConv::CheckURLAndCreateHTML(const nsString& txtURL,
+                                             const nsString& desc,
+                                             const modetype mode,
+                                             nsString& outputHTML) {
+  // Create *uri from txtURL
+  nsCOMPtr<nsIURI> uri;
+  nsresult rv;
+  // Lazily initialize mIOService
+  if (!mIOService) {
+    mIOService = do_GetIOService();
+
+    if (!mIOService) return false;
+  }
+
+  // See if the url should be linkified.
+  NS_ConvertUTF16toUTF8 utf8URL(txtURL);
+  if (!ShouldLinkify(utf8URL)) return false;
+
+  // it would be faster if we could just check to see if there is a protocol
+  // handler for the url and return instead of actually trying to create a
+  // url...
+  rv = mIOService->NewURI(utf8URL, nullptr, nullptr, getter_AddRefs(uri));
+
+  // Real work
+  if (NS_SUCCEEDED(rv) && uri) {
+    outputHTML.AssignLiteral("<a class=\"moz-txt-link-");
+    switch (mode) {
+      case RFC1738:
+        outputHTML.AppendLiteral("rfc1738");
+        break;
+      case RFC2396E:
+        outputHTML.AppendLiteral("rfc2396E");
+        break;
+      case freetext:
+        outputHTML.AppendLiteral("freetext");
+        break;
+      case abbreviated:
+        outputHTML.AppendLiteral("abbreviated");
+        break;
+      default:
+        break;
+    }
+    nsAutoString escapedURL(txtURL);
+    EscapeStr(escapedURL, true);
+
+    outputHTML.AppendLiteral("\" href=\"");
+    outputHTML += escapedURL;
+    outputHTML.AppendLiteral("\">");
+    outputHTML += desc;
+    outputHTML.AppendLiteral("</a>");
+    return true;
+  }
+  return false;
+}
+
+NS_IMETHODIMP mozTXTToHTMLConv::FindURLInPlaintext(const char16_t* aInString,
+                                                   int32_t aInLength,
+                                                   int32_t aPos,
+                                                   int32_t* aStartPos,
+                                                   int32_t* aEndPos) {
+  // call FindURL on the passed in string
+  nsAutoString outputHTML;  // we'll ignore the generated output HTML
+
+  *aStartPos = -1;
+  *aEndPos = -1;
+
+  FindURL(aInString, aInLength, aPos, kURLs, outputHTML, *aStartPos, *aEndPos);
+
+  return NS_OK;
+}
+
+bool mozTXTToHTMLConv::FindURL(const char16_t* aInString, int32_t aInLength,
+                               const uint32_t pos,
+                               const uint32_t whathasbeendone,
+                               nsString& outputHTML, int32_t& replaceBefore,
+                               int32_t& replaceAfter) {
+  enum statetype { unchecked, invalid, startok, endok, success };
+  static const modetype ranking[] = {RFC1738, RFC2396E, freetext, abbreviated};
+
+  statetype state[mozTXTToHTMLConv_lastMode + 1];  // 0(=unknown)..lastMode
+  /* I don't like this abuse of enums as index for the array,
+     but I don't know a better method */
+
+  // Define, which modes to check
+  /* all modes but abbreviated are checked for text[pos] == ':',
+     only abbreviated for '.', RFC2396E and abbreviated for '@' */
+  for (modetype iState = unknown; iState <= mozTXTToHTMLConv_lastMode;
+       iState = modetype(iState + 1)) {
+    state[iState] = aInString[pos] == ':' ? unchecked : invalid;
+  }
+  switch (aInString[pos]) {
+    case '@':
+      state[RFC2396E] = unchecked;
+      [[fallthrough]];
+    case '.':
+      state[abbreviated] = unchecked;
+      break;
+    case ':':
+      state[abbreviated] = invalid;
+      break;
+    default:
+      break;
+  }
+
+  // Test, first successful mode wins, sequence defined by |ranking|
+  int32_t iCheck = 0;  // the currently tested modetype
+  modetype check = ranking[iCheck];
+  for (; iCheck < mozTXTToHTMLConv_numberOfModes && state[check] != success;
+       iCheck++)
+  /* check state from last run.
+     If this is the first, check this one, which isn't = success yet */
+  {
+    check = ranking[iCheck];
+
+    uint32_t start, end;
+
+    if (state[check] == unchecked) {
+      if (FindURLStart(aInString, aInLength, pos, check, start)) {
+        state[check] = startok;
+      }
+    }
+
+    if (state[check] == startok) {
+      if (FindURLEnd(aInString, aInLength, pos, check, start, end)) {
+        state[check] = endok;
+      }
+    }
+
+    if (state[check] == endok) {
+      nsAutoString txtURL, desc;
+      int32_t resultReplaceBefore, resultReplaceAfter;
+
+      CalculateURLBoundaries(aInString, aInLength, pos, whathasbeendone, check,
+                             start, end, txtURL, desc, resultReplaceBefore,
+                             resultReplaceAfter);
+
+      if (aInString[pos] != ':') {
+        nsAutoString temp = txtURL;
+        txtURL.SetLength(0);
+        CompleteAbbreviatedURL(temp.get(), temp.Length(), pos - start, txtURL);
+      }
+
+      if (!txtURL.IsEmpty() &&
+          CheckURLAndCreateHTML(txtURL, desc, check, outputHTML)) {
+        replaceBefore = resultReplaceBefore;
+        replaceAfter = resultReplaceAfter;
+        state[check] = success;
+      }
+    }  // if
+  }    // for
+  return state[check] == success;
+}
+
+static inline bool IsAlpha(const uint32_t aChar) {
+  return mozilla::unicode::GetGenCategory(aChar) == nsUGenCategory::kLetter;
+}
+
+static inline bool IsDigit(const uint32_t aChar) {
+  return mozilla::unicode::GetGenCategory(aChar) == nsUGenCategory::kNumber;
+}
+
+bool mozTXTToHTMLConv::ItMatchesDelimited(const char16_t* aInString,
+                                          int32_t aInLength,
+                                          const char16_t* rep, int32_t aRepLen,
+                                          LIMTYPE before, LIMTYPE after) {
+  // this little method gets called a LOT. I found we were spending a
+  // lot of time just calculating the length of the variable "rep"
+  // over and over again every time we called it. So we're now passing
+  // an integer in here.
+  int32_t textLen = aInLength;
+
+  if (((before == LT_IGNORE && (after == LT_IGNORE || after == LT_DELIMITER)) &&
+       textLen < aRepLen) ||
+      ((before != LT_IGNORE || (after != LT_IGNORE && after != LT_DELIMITER)) &&
+       textLen < aRepLen + 1) ||
+      (before != LT_IGNORE && after != LT_IGNORE && after != LT_DELIMITER &&
+       textLen < aRepLen + 2)) {
+    return false;
+  }
+
+  uint32_t text0 = aInString[0];
+  if (aInLength > 1 && NS_IS_SURROGATE_PAIR(text0, aInString[1])) {
+    text0 = SURROGATE_TO_UCS4(text0, aInString[1]);
+  }
+  // find length of the char/cluster to be ignored
+  int32_t ignoreLen = before == LT_IGNORE ? 0 : 1;
+  if (ignoreLen) {
+    GraphemeClusterBreakIteratorUtf16 ci(
+        Span<const char16_t>(aInString, aInLength));
+    ignoreLen = *ci.Next();
+  }
+
+  int32_t afterIndex = aRepLen + ignoreLen;
+  uint32_t textAfterPos = aInString[afterIndex];
+  if (aInLength > afterIndex + 1 &&
+      NS_IS_SURROGATE_PAIR(textAfterPos, aInString[afterIndex + 1])) {
+    textAfterPos = SURROGATE_TO_UCS4(textAfterPos, aInString[afterIndex + 1]);
+  }
+
+  return !((before == LT_ALPHA && !IsAlpha(text0)) ||
+           (before == LT_DIGIT && !IsDigit(text0)) ||
+           (before == LT_DELIMITER &&
+            (IsAlpha(text0) || IsDigit(text0) || text0 == *rep)) ||
+           (after == LT_ALPHA && !IsAlpha(textAfterPos)) ||
+           (after == LT_DIGIT && !IsDigit(textAfterPos)) ||
+           (after == LT_DELIMITER &&
+            (IsAlpha(textAfterPos) || IsDigit(textAfterPos) ||
+             textAfterPos == *rep)) ||
+           !Substring(Substring(aInString, aInString + aInLength), ignoreLen,
+                      aRepLen)
+                .Equals(Substring(rep, rep + aRepLen),
+                        nsCaseInsensitiveStringComparator));
+}
+
+uint32_t mozTXTToHTMLConv::NumberOfMatches(const char16_t* aInString,
+                                           int32_t aInStringLength,
+                                           const char16_t* rep, int32_t aRepLen,
+                                           LIMTYPE before, LIMTYPE after) {
+  uint32_t result = 0;
+
+  const uint32_t len = mozilla::AssertedCast<uint32_t>(aInStringLength);
+  GraphemeClusterBreakIteratorUtf16 ci(Span<const char16_t>(aInString, len));
+  for (uint32_t pos = 0; pos < len; pos = *ci.Next()) {
+    if (ItMatchesDelimited(aInString + pos, aInStringLength - pos, rep, aRepLen,
+                           before, after)) {
+      result++;
+    }
+  }
+  return result;
+}
+
+// NOTE: the converted html for the phrase is appended to aOutString
+// tagHTML and attributeHTML are plain ASCII (literal strings, in fact)
+bool mozTXTToHTMLConv::StructPhraseHit(
+    const char16_t* aInString, int32_t aInStringLength, bool col0,
+    const char16_t* tagTXT, int32_t aTagTXTLen, const char* tagHTML,
+    const char* attributeHTML, nsAString& aOutString, uint32_t& openTags) {
+  /* We're searching for the following pattern:
+     LT_DELIMITER - "*" - ALPHA -
+     [ some text (maybe more "*"-pairs) - ALPHA ] "*" - LT_DELIMITER.
+     <strong> is only inserted, if existence of a pair could be verified
+     We use the first opening/closing tag, if we can choose */
+
+  const char16_t* newOffset = aInString;
+  int32_t newLength = aInStringLength;
+  if (!col0)  // skip the first element?
+  {
+    newOffset = &aInString[1];
+    newLength = aInStringLength - 1;
+  }
+
+  // opening tag
+  if (ItMatchesDelimited(aInString, aInStringLength, tagTXT, aTagTXTLen,
+                         (col0 ? LT_IGNORE : LT_DELIMITER),
+                         LT_ALPHA)  // is opening tag
+      && NumberOfMatches(newOffset, newLength, tagTXT, aTagTXTLen, LT_ALPHA,
+                         LT_DELIMITER)  // remaining closing tags
+             > openTags) {
+    openTags++;
+    aOutString.Append('<');
+    aOutString.AppendASCII(tagHTML);
+    aOutString.Append(char16_t(' '));
+    aOutString.AppendASCII(attributeHTML);
+    aOutString.AppendLiteral("><span class=\"moz-txt-tag\">");
+    aOutString.Append(tagTXT);
+    aOutString.AppendLiteral("</span>");
+    return true;
+  }
+
+  // closing tag
+  if (openTags > 0 && ItMatchesDelimited(aInString, aInStringLength, tagTXT,
+                                         aTagTXTLen, LT_ALPHA, LT_DELIMITER)) {
+    openTags--;
+    aOutString.AppendLiteral("<span class=\"moz-txt-tag\">");
+    aOutString.Append(tagTXT);
+    aOutString.AppendLiteral("</span></");
+    aOutString.AppendASCII(tagHTML);
+    aOutString.Append(char16_t('>'));
+    return true;
+  }
+
+  return false;
+}
+
+bool mozTXTToHTMLConv::SmilyHit(const char16_t* aInString, int32_t aLength,
+                                bool col0, const char* tagTXT,
+                                const nsString& imageName, nsString& outputHTML,
+                                int32_t& glyphTextLen) {
+  if (!aInString || !tagTXT || imageName.IsEmpty()) return false;
+
+  int32_t tagLen = strlen(tagTXT);
+
+  uint32_t delim = (col0 ? 0 : 1) + tagLen;
+
+  if ((col0 || IsSpace(aInString[0])) &&
+      (aLength <= int32_t(delim) || IsSpace(aInString[delim]) ||
+       (aLength > int32_t(delim + 1) &&
+        (aInString[delim] == '.' || aInString[delim] == ',' ||
+         aInString[delim] == ';' || aInString[delim] == '8' ||
+         aInString[delim] == '>' || aInString[delim] == '!' ||
+         aInString[delim] == '?') &&
+        IsSpace(aInString[delim + 1]))) &&
+      ItMatchesDelimited(aInString, aLength,
+                         NS_ConvertASCIItoUTF16(tagTXT).get(), tagLen,
+                         col0 ? LT_IGNORE : LT_DELIMITER, LT_IGNORE)
+      // Note: tests at different pos for LT_IGNORE and LT_DELIMITER
+  ) {
+    if (!col0) {
+      outputHTML.Truncate();
+      outputHTML.Append(char16_t(' '));
+    }
+
+    outputHTML.Append(imageName);  // emoji unicode
+    glyphTextLen = (col0 ? 0 : 1) + tagLen;
+    return true;
+  }
+
+  return false;
+}
+
+// the glyph is appended to aOutputString instead of the original string...
+bool mozTXTToHTMLConv::GlyphHit(const char16_t* aInString, int32_t aInLength,
+                                bool col0, nsAString& aOutputString,
+                                int32_t& glyphTextLen) {
+  char16_t text0 = aInString[0];
+  char16_t text1 = aInString[1];
+  char16_t firstChar = (col0 ? text0 : text1);
+
+  // temporary variable used to store the glyph html text
+  nsAutoString outputHTML;
+  bool bTestSmilie;
+  bool bArg = false;
+  int i;
+
+  // refactor some of this mess to avoid code duplication and speed execution a
+  // bit there are two cases that need to be tried one after another. To avoid a
+  // lot of duplicate code, rolling into a loop
+
+  i = 0;
+  while (i < 2) {
+    bTestSmilie = false;
+    if (!i && (firstChar == ':' || firstChar == ';' || firstChar == '=' ||
+               firstChar == '>' || firstChar == '8' || firstChar == 'O')) {
+      // first test passed
+
+      bTestSmilie = true;
+      bArg = col0;
+    }
+    if (i && col0 &&
+        (text1 == ':' || text1 == ';' || text1 == '=' || text1 == '>' ||
+         text1 == '8' || text1 == 'O')) {
+      // second test passed
+
+      bTestSmilie = true;
+      bArg = false;
+    }
+    if (bTestSmilie && (SmilyHit(aInString, aInLength, bArg, ":-)",
+                                 u"😄"_ns,  // smile, U+1F604
+                                 outputHTML, glyphTextLen) ||
+
+                        SmilyHit(aInString, aInLength, bArg, ":)",
+                                 u"😄"_ns,  // smile, U+1F604
+                                 outputHTML, glyphTextLen) ||
+
+                        SmilyHit(aInString, aInLength, bArg, ":-D",
+                                 u"😂"_ns,  // laughing, U+1F602
+                                 outputHTML, glyphTextLen) ||
+
+                        SmilyHit(aInString, aInLength, bArg, ":-(",
+                                 u"🙁"_ns,  // frown, U+1F641
+                                 outputHTML, glyphTextLen) ||
+
+                        SmilyHit(aInString, aInLength, bArg, ":(",
+                                 u"🙁"_ns,  // frown, U+1F641
+                                 outputHTML, glyphTextLen) ||
+
+                        SmilyHit(aInString, aInLength, bArg, ":-[",
+                                 u"😅"_ns,  // embarassed, U+1F605
+                                 outputHTML, glyphTextLen) ||
+
+                        SmilyHit(aInString, aInLength, bArg, ";-)",
+                                 u"😉"_ns,  // wink, U+1F609
+                                 outputHTML, glyphTextLen) ||
+
+                        SmilyHit(aInString, aInLength, col0, ";)",
+                                 u"😉"_ns,  // wink, U+1F609
+                                 outputHTML, glyphTextLen) ||
+
+                        SmilyHit(aInString, aInLength, bArg, ":-\\",
+                                 u"😕"_ns,  // undecided, U+1F615
+                                 outputHTML, glyphTextLen) ||
+
+                        SmilyHit(aInString, aInLength, bArg, ":-P",
+                                 u"😛"_ns,  // tongue, U+1F61B
+                                 outputHTML, glyphTextLen) ||
+
+                        SmilyHit(aInString, aInLength, bArg, ";-P",
+                                 u"😜"_ns,  // winking face with tongue, U+1F61C
+                                 outputHTML, glyphTextLen) ||
+
+                        SmilyHit(aInString, aInLength, bArg, "=-O",
+                                 u"😮"_ns,  // surprise, U+1F62E
+                                 outputHTML, glyphTextLen) ||
+
+                        SmilyHit(aInString, aInLength, bArg, ":-*",
+                                 u"😘"_ns,  // kiss, U+1F618
+                                 outputHTML, glyphTextLen) ||
+
+                        SmilyHit(aInString, aInLength, bArg, ">:o",
+                                 u"🤬"_ns,  // swearing, U+1F92C
+                                 outputHTML, glyphTextLen) ||
+
+                        SmilyHit(aInString, aInLength, bArg, ">:-o",
+                                 u"🤬"_ns,  // swearing, U+1F92C
+                                 outputHTML, glyphTextLen) ||
+
+                        SmilyHit(aInString, aInLength, bArg, ">:(",
+                                 u"😠"_ns,  // angry, U+1F620
+                                 outputHTML, glyphTextLen) ||
+
+                        SmilyHit(aInString, aInLength, bArg, ">:-(",
+                                 u"😠"_ns,  // angry, U+1F620
+                                 outputHTML, glyphTextLen) ||
+
+                        SmilyHit(aInString, aInLength, bArg, "8-)",
+                                 u"😎"_ns,  // cool, U+1F60E
+                                 outputHTML, glyphTextLen) ||
+
+                        SmilyHit(aInString, aInLength, bArg, ":-$",
+                                 u"🤑"_ns,  // money, U+1F911
+                                 outputHTML, glyphTextLen) ||
+
+                        SmilyHit(aInString, aInLength, bArg, ":-!",
+                                 u"😬"_ns,  // foot, U+1F62C
+                                 outputHTML, glyphTextLen) ||
+
+                        SmilyHit(aInString, aInLength, bArg, "O:-)",
+                                 u"😇"_ns,  // innocent, U+1F607
+                                 outputHTML, glyphTextLen) ||
+
+                        SmilyHit(aInString, aInLength, bArg, ":'(",
+                                 u"😭"_ns,  // cry, U+1F62D
+                                 outputHTML, glyphTextLen) ||
+
+                        SmilyHit(aInString, aInLength, bArg, ":-X",
+                                 u"🤐"_ns,  // sealed, U+1F910
+                                 outputHTML, glyphTextLen))) {
+      aOutputString.Append(outputHTML);
+      return true;
+    }
+    i++;
+  }
+  if (text0 == '\f') {
+    aOutputString.AppendLiteral("<span class='moz-txt-formfeed'></span>");
+    glyphTextLen = 1;
+    return true;
+  }
+  if (text0 == '+' || text1 == '+') {
+    if (ItMatchesDelimited(aInString, aInLength, u" +/-", 4, LT_IGNORE,
+                           LT_IGNORE)) {
+      aOutputString.AppendLiteral(" &plusmn;");
+      glyphTextLen = 4;
+      return true;
+    }
+    if (col0 && ItMatchesDelimited(aInString, aInLength, u"+/-", 3, LT_IGNORE,
+                                   LT_IGNORE)) {
+      aOutputString.AppendLiteral("&plusmn;");
+      glyphTextLen = 3;
+      return true;
+    }
+  }
+
+  // x^2  =>  x<sup>2</sup>,   also handle powers x^-2,  x^0.5
+  // implement regular expression /[\dA-Za-z\)\]}]\^-?\d+(\.\d+)*[^\dA-Za-z]/
+  if (text1 == '^' &&
+      (IsAsciiDigit(text0) || IsAsciiAlpha(text0) || text0 == ')' ||
+       text0 == ']' || text0 == '}') &&
+      ((2 < aInLength && IsAsciiDigit(aInString[2])) ||
+       (3 < aInLength && aInString[2] == '-' && IsAsciiDigit(aInString[3])))) {
+    // Find first non-digit
+    int32_t delimPos = 3;  // skip "^" and first digit (or '-')
+    for (; delimPos < aInLength &&
+           (IsAsciiDigit(aInString[delimPos]) ||
+            (aInString[delimPos] == '.' && delimPos + 1 < aInLength &&
+             IsAsciiDigit(aInString[delimPos + 1])));
+         delimPos++) {
+      ;
+    }
+
+    if (delimPos < aInLength && IsAsciiAlpha(aInString[delimPos])) {
+      return false;
+    }
+
+    outputHTML.Truncate();
+    outputHTML += text0;
+    outputHTML.AppendLiteral(
+        "<sup class=\"moz-txt-sup\">"
+        "<span style=\"display:inline-block;width:0;height:0;overflow:hidden\">"
+        "^</span>");
+
+    aOutputString.Append(outputHTML);
+    aOutputString.Append(&aInString[2], delimPos - 2);
+    aOutputString.AppendLiteral("</sup>");
+
+    glyphTextLen = delimPos /* - 1 + 1 */;
+    return true;
+  }
+  /*
+   The following strings are not substituted:
+   |TXT   |HTML     |Reason
+   +------+---------+----------
+    ->     &larr;    Bug #454
+    =>     &lArr;    dito
+    <-     &rarr;    dito
+    <=     &rArr;    dito
+    (tm)   &trade;   dito
+    1/4    &frac14;  is triggered by 1/4 Part 1, 2/4 Part 2, ...
+    3/4    &frac34;  dito
+    1/2    &frac12;  similar
+  */
+  return false;
+}
+
+/***************************************************************************
+  Library-internal Interface
+****************************************************************************/
+
+NS_IMPL_ISUPPORTS(mozTXTToHTMLConv, mozITXTToHTMLConv, nsIStreamConverter,
+                  nsIStreamListener, nsIRequestObserver)
+
+int32_t mozTXTToHTMLConv::CiteLevelTXT(const char16_t* line,
+                                       uint32_t& logLineStart) {
+  int32_t result = 0;
+  int32_t lineLength = NS_strlen(line);
+
+  bool moreCites = true;
+  while (moreCites) {
+    /* E.g. the following lines count as quote:
+
+       > text
+       //#ifdef QUOTE_RECOGNITION_AGGRESSIVE
+       >text
+       //#ifdef QUOTE_RECOGNITION_AGGRESSIVE
+           > text
+       ] text
+       USER> text
+       USER] text
+       //#endif
+
+       logLineStart is the position of "t" in this example
+    */
+    uint32_t i = logLineStart;
+
+#ifdef QUOTE_RECOGNITION_AGGRESSIVE
+    for (; int32_t(i) < lineLength && IsSpace(line[i]); i++)
+      ;
+    for (; int32_t(i) < lineLength && IsAsciiAlpha(line[i]) &&
+           nsCRT::IsUpper(line[i]);
+         i++)
+      ;
+    if (int32_t(i) < lineLength && (line[i] == '>' || line[i] == ']'))
+#else
+    if (int32_t(i) < lineLength && line[i] == '>')
+#endif
+    {
+      i++;
+      if (int32_t(i) < lineLength && line[i] == ' ') i++;
+      // sendmail/mbox
+      // Placed here for performance increase
+      const char16_t* indexString = &line[logLineStart];
+      // here, |logLineStart < lineLength| is always true
+      uint32_t minlength = std::min(uint32_t(6), NS_strlen(indexString));
+      if (Substring(indexString, indexString + minlength)
+              .Equals(Substring(u">From "_ns, 0, minlength),
+                      nsCaseInsensitiveStringComparator)) {
+        // XXX RFC2646
+        moreCites = false;
+      } else {
+        result++;
+        logLineStart = i;
+      }
+    } else {
+      moreCites = false;
+    }
+  }
+
+  return result;
+}
+
+NS_IMETHODIMP
+mozTXTToHTMLConv::ScanTXT(const nsAString& aInString, uint32_t whattodo,
+                          nsAString& aOutString) {
+  if (aInString.Length() == 0) {
+    aOutString.Truncate();
+    return NS_OK;
+  }
+
+  if (!aOutString.SetCapacity(uint32_t(aInString.Length() * growthRate),
+                              mozilla::fallible)) {
+    return NS_ERROR_OUT_OF_MEMORY;
+  }
+
+  bool doURLs = 0 != (whattodo & kURLs);
+  bool doGlyphSubstitution = 0 != (whattodo & kGlyphSubstitution);
+  bool doStructPhrase = 0 != (whattodo & kStructPhrase);
+
+  uint32_t structPhrase_strong = 0;  // Number of currently open tags
+  uint32_t structPhrase_underline = 0;
+  uint32_t structPhrase_italic = 0;
+  uint32_t structPhrase_code = 0;
+
+  uint32_t endOfLastURLOutput = 0;
+
+  nsAutoString outputHTML;  // moved here for performance increase
+
+  const char16_t* rawInputString = aInString.BeginReading();
+  uint32_t inLength = aInString.Length();
+
+  const Span<const char16_t> inString(aInString);
+  GraphemeClusterBreakIteratorUtf16 ci(inString);
+  uint32_t i = 0;
+  while (i < inLength) {
+    if (doGlyphSubstitution) {
+      int32_t glyphTextLen;
+      if (GlyphHit(&rawInputString[i], inLength - i, i == 0, aOutString,
+                   glyphTextLen)) {
+        i = *ci.Seek(i + glyphTextLen - 1);
+        continue;
+      }
+    }
+
+    if (doStructPhrase) {
+      const char16_t* newOffset = rawInputString;
+      int32_t newLength = aInString.Length();
+      if (i > 0)  // skip the first element?
+      {
+        GraphemeClusterBreakReverseIteratorUtf16 ri(
+            Span<const char16_t>(rawInputString, i));
+        Maybe<uint32_t> nextPos = ri.Next();
+        newOffset += *nextPos;
+        newLength -= *nextPos;
+      }
+
+      switch (aInString[i])  // Performance increase
+      {
+        case '*':
+          if (StructPhraseHit(newOffset, newLength, i == 0, u"*", 1, "b",
+                              "class=\"moz-txt-star\"", aOutString,
+                              structPhrase_strong)) {
+            i = *ci.Next();
+            continue;
+          }
+          break;
+        case '/':
+          if (StructPhraseHit(newOffset, newLength, i == 0, u"/", 1, "i",
+                              "class=\"moz-txt-slash\"", aOutString,
+                              structPhrase_italic)) {
+            i = *ci.Next();
+            continue;
+          }
+          break;
+        case '_':
+          if (StructPhraseHit(newOffset, newLength, i == 0, u"_", 1,
+                              "span" /* <u> is deprecated */,
+                              "class=\"moz-txt-underscore\"", aOutString,
+                              structPhrase_underline)) {
+            i = *ci.Next();
+            continue;
+          }
+          break;
+        case '|':
+          if (StructPhraseHit(newOffset, newLength, i == 0, u"|", 1, "code",
+                              "class=\"moz-txt-verticalline\"", aOutString,
+                              structPhrase_code)) {
+            i = *ci.Next();
+            continue;
+          }
+          break;
+      }
+    }
+
+    if (doURLs) {
+      switch (aInString[i]) {
+        case ':':
+        case '@':
+        case '.':
+          if ((i == 0 || ((i > 0) && aInString[i - 1] != ' ')) &&
+              ((i == aInString.Length() - 1) ||
+               (aInString[i + 1] != ' ')))  // Performance increase
+          {
+            int32_t replaceBefore;
+            int32_t replaceAfter;
+            if (FindURL(rawInputString, aInString.Length(), i, whattodo,
+                        outputHTML, replaceBefore, replaceAfter) &&
+                structPhrase_strong + structPhrase_italic +
+                        structPhrase_underline + structPhrase_code ==
+                    0
+                /* workaround for bug #19445 */) {
+              // Don't cut into previously inserted HTML (bug 1509493)
+              if (aOutString.Length() - replaceBefore < endOfLastURLOutput) {
+                break;
+              }
+              aOutString.Cut(aOutString.Length() - replaceBefore,
+                             replaceBefore);
+              aOutString += outputHTML;
+              endOfLastURLOutput = aOutString.Length();
+              i = *ci.Seek(i + replaceAfter);
+              continue;
+            }
+          }
+          break;
+      }  // switch
+    }
+
+    switch (aInString[i]) {
+      // Special symbols
+      case '<':
+      case '>':
+      case '&':
+        EscapeChar(aInString[i], aOutString, false);
+        i = *ci.Next();
+        break;
+      // Normal characters
+      default: {
+        const uint32_t oldIdx = i;
+        i = *ci.Next();
+        aOutString.Append(inString.FromTo(oldIdx, i));
+        break;
+      }
+    }
+  }
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+mozTXTToHTMLConv::ScanHTML(const nsAString& input, uint32_t whattodo,
+                           nsAString& aOutString) {
+  const nsPromiseFlatString& aInString = PromiseFlatString(input);
+  if (!aOutString.SetCapacity(uint32_t(aInString.Length() * growthRate),
+                              mozilla::fallible)) {
+    return NS_ERROR_OUT_OF_MEMORY;
+  }
+
+  // some common variables we were recalculating
+  // every time inside the for loop...
+  int32_t lengthOfInString = aInString.Length();
+  const char16_t* uniBuffer = aInString.get();
+
+#ifdef DEBUG_BenB_Perf
+  PRTime parsing_start = PR_IntervalNow();
+#endif
+
+  // Look for simple entities not included in a tags and scan them.
+  // Skip all tags ("<[...]>") and content in an a link tag ("<a [...]</a>"),
+  // comment tag ("<!--[...]-->"), style tag, script tag or head tag.
+  // Unescape the rest (text between tags) and pass it to ScanTXT.
+  nsAutoCString canFollow(" \f\n\r\t>");
+  for (int32_t i = 0; i < lengthOfInString;) {
+    if (aInString[i] == '<')  // html tag
+    {
+      int32_t start = i;
+      if (i + 2 < lengthOfInString && nsCRT::ToLower(aInString[i + 1]) == 'a' &&
+          canFollow.FindChar(aInString[i + 2]) != kNotFound)
+      // if a tag, skip until </a>.
+      // Make sure there's a white-space character after, not to match "abbr".
+      {
+        i = aInString.LowerCaseFindASCII("</a>", i);
+        if (i == kNotFound) {
+          i = lengthOfInString;
+        } else {
+          i += 4;
+        }
+      } else if (Substring(aInString, i + 1, 3).LowerCaseEqualsASCII("!--"))
+      // if out-commended code, skip until -->
+      {
+        i = aInString.Find(u"-->", i);
+        if (i == kNotFound) {
+          i = lengthOfInString;
+        } else {
+          i += 3;
+        }
+      } else if (i + 6 < lengthOfInString &&
+                 Substring(aInString, i + 1, 5).LowerCaseEqualsASCII("style") &&
+                 canFollow.FindChar(aInString[i + 6]) != kNotFound)
+      // if style tag, skip until </style>
+      {
+        i = aInString.LowerCaseFindASCII("</style>", i);
+        if (i == kNotFound) {
+          i = lengthOfInString;
+        } else {
+          i += 8;
+        }
+      } else if (i + 7 < lengthOfInString &&
+                 Substring(aInString, i + 1, 6)
+                     .LowerCaseEqualsASCII("script") &&
+                 canFollow.FindChar(aInString[i + 7]) != kNotFound)
+      // if script tag, skip until </script>
+      {
+        i = aInString.LowerCaseFindASCII("</script>", i);
+        if (i == kNotFound) {
+          i = lengthOfInString;
+        } else {
+          i += 9;
+        }
+      } else if (i + 5 < lengthOfInString &&
+                 Substring(aInString, i + 1, 4).LowerCaseEqualsASCII("head") &&
+                 canFollow.FindChar(aInString[i + 5]) != kNotFound)
+      // if head tag, skip until </head>
+      // Make sure not to match <header>.
+      {
+        i = aInString.LowerCaseFindASCII("</head>", i);
+        if (i == kNotFound) {
+          i = lengthOfInString;
+        } else {
+          i += 7;
+        }
+      } else  // just skip tag (attributes etc.)
+      {
+        i = aInString.FindChar('>', i);
+        if (i == kNotFound) {
+          i = lengthOfInString;
+        } else {
+          i++;
+        }
+      }
+      aOutString.Append(&uniBuffer[start], i - start);
+    } else {
+      uint32_t start = uint32_t(i);
+      i = aInString.FindChar('<', i);
+      if (i == kNotFound) i = lengthOfInString;
+
+      nsString tempString;
+      tempString.SetCapacity(uint32_t((uint32_t(i) - start) * growthRate));
+      UnescapeStr(uniBuffer, start, uint32_t(i) - start, tempString);
+      ScanTXT(tempString, whattodo, aOutString);
+    }
+  }
+
+#ifdef DEBUG_BenB_Perf
+  printf("ScanHTML time:    %d ms\n",
+         PR_IntervalToMilliseconds(PR_IntervalNow() - parsing_start));
+#endif
+  return NS_OK;
+}
+
+/****************************************************************************
+  XPCOM Interface
+*****************************************************************************/
+
+NS_IMETHODIMP
+mozTXTToHTMLConv::Convert(nsIInputStream* aFromStream, const char* aFromType,
+                          const char* aToType, nsISupports* aCtxt,
+                          nsIInputStream** _retval) {
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP
+mozTXTToHTMLConv::AsyncConvertData(const char* aFromType, const char* aToType,
+                                   nsIStreamListener* aListener,
+                                   nsISupports* aCtxt) {
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP
+mozTXTToHTMLConv::GetConvertedType(const nsACString& aFromType,
+                                   nsIChannel* aChannel, nsACString& aToType) {
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP
+mozTXTToHTMLConv::OnDataAvailable(nsIRequest* request, nsIInputStream* inStr,
+                                  uint64_t sourceOffset, uint32_t count) {
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP
+mozTXTToHTMLConv::OnStartRequest(nsIRequest* request) {
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP
+mozTXTToHTMLConv::OnStopRequest(nsIRequest* request, nsresult aStatus) {
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP
+mozTXTToHTMLConv::CiteLevelTXT(const char16_t* line, uint32_t* logLineStart,
+                               uint32_t* _retval) {
+  if (!logLineStart || !_retval || !line) return NS_ERROR_NULL_POINTER;
+  *_retval = CiteLevelTXT(line, *logLineStart);
+  return NS_OK;
+}
+
+nsresult MOZ_NewTXTToHTMLConv(mozTXTToHTMLConv** aConv) {
+  MOZ_ASSERT(aConv != nullptr, "null ptr");
+  if (!aConv) return NS_ERROR_NULL_POINTER;
+
+  RefPtr<mozTXTToHTMLConv> conv = new mozTXTToHTMLConv();
+  conv.forget(aConv);
+  //    return (*aConv)->Init();
+  return NS_OK;
+}