widget/nsHTMLFormatConverter.cpp
author Valentin Gosu <valentin.gosu@gmail.com>
Fri, 02 Nov 2018 17:38:37 -0400
changeset 501038 8016d0d1a391f1327a0375fb6d4f20228b2784aa
parent 499071 55588bdd2ee8f5bcd66c6af0b340d5b02bf0411e
child 506443 f198bf91320bf774f2c9f204c426ac0c2da95aa2
permissions -rw-r--r--
Bug 1503725 - Do not deallocate nsThreadShutdownContext when leaking thread. r=erahm, a=RyanVM Sometimes when we call ShutdownWithTimeout on a thread pool, the unresponsive thread that we leak will actually complete before the main thread is done. In that case, the thread will dereference the thread shutdown context, so we must intentionally leak it too. Differential Revision: https://phabricator.services.mozilla.com/D10645

/* -*- 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 "nsHTMLFormatConverter.h"

#include "nsArray.h"
#include "nsCRT.h"
#include "nsIComponentManager.h"
#include "nsCOMPtr.h"
#include "nsXPCOM.h"
#include "nsISupportsPrimitives.h"

#include "nsITransferable.h" // for mime defs, this is BAD

// HTML convertor stuff
#include "nsPrimitiveHelpers.h"
#include "nsIDocumentEncoder.h"
#include "nsContentUtils.h"

nsHTMLFormatConverter::nsHTMLFormatConverter()
{
}

nsHTMLFormatConverter::~nsHTMLFormatConverter()
{
}

NS_IMPL_ISUPPORTS(nsHTMLFormatConverter, nsIFormatConverter)

//
// GetInputDataFlavors
//
// Creates a new list and returns the list of all the flavors this converter
// knows how to import. In this case, it's just HTML.
//
NS_IMETHODIMP
nsHTMLFormatConverter::GetInputDataFlavors(nsTArray<nsCString>& aFlavors)
{
  aFlavors.AppendElement(NS_LITERAL_CSTRING(kHTMLMime));
  return NS_OK;
}


//
// GetOutputDataFlavors
//
// Creates a new list and returns the list of all the flavors this converter
// knows how to export (convert). In this case, it's all sorts of things that HTML can be
// converted to.
//
NS_IMETHODIMP
nsHTMLFormatConverter::GetOutputDataFlavors(nsTArray<nsCString>& aFlavors)
{
  aFlavors.AppendElement(NS_LITERAL_CSTRING(kHTMLMime));
  aFlavors.AppendElement(NS_LITERAL_CSTRING(kUnicodeMime));
  return NS_OK;
}

//
// CanConvert
//
// Determines if we support the given conversion. Currently, this method only
// converts from HTML to others.
//
NS_IMETHODIMP
nsHTMLFormatConverter::CanConvert(const char *aFromDataFlavor, const char *aToDataFlavor, bool *_retval)
{
  if ( !_retval )
    return NS_ERROR_INVALID_ARG;

  *_retval = false;
  if ( !nsCRT::strcmp(aFromDataFlavor, kHTMLMime) ) {
    if ( !nsCRT::strcmp(aToDataFlavor, kHTMLMime) )
      *_retval = true;
    else if ( !nsCRT::strcmp(aToDataFlavor, kUnicodeMime) )
      *_retval = true;
#if NOT_NOW
// pinkerton
// no one uses this flavor right now, so it's just slowing things down. If anyone cares I
// can put it back in.
    else if ( toFlavor.Equals(kAOLMailMime) )
      *_retval = true;
#endif
  }
  return NS_OK;

} // CanConvert



//
// Convert
//
// Convert data from one flavor to another. The data is wrapped in primitive objects so that it is
// accessible from JS. Currently, this only accepts HTML input, so anything else is invalid.
//
//XXX This method copies the data WAAAAY too many time for my liking. Grrrrrr. Mostly it's because
//XXX we _must_ put things into nsStrings so that the parser will accept it. Lame lame lame lame. We
//XXX also can't just get raw unicode out of the nsString, so we have to allocate heap to get
//XXX unicode out of the string. Lame lame lame.
//
NS_IMETHODIMP
nsHTMLFormatConverter::Convert(const char *aFromDataFlavor, nsISupports *aFromData, uint32_t aDataLen,
                               const char *aToDataFlavor, nsISupports **aToData, uint32_t *aDataToLen)
{
  if ( !aToData || !aDataToLen )
    return NS_ERROR_INVALID_ARG;

  nsresult rv = NS_OK;
  *aToData = nullptr;
  *aDataToLen = 0;

  if ( !nsCRT::strcmp(aFromDataFlavor, kHTMLMime) ) {
    nsAutoCString toFlavor ( aToDataFlavor );

    // HTML on clipboard is going to always be double byte so it will be in a primitive
    // class of nsISupportsString. Also, since the data is in two byte chunks the
    // length represents the length in 1-byte chars, so we need to divide by two.
    nsCOMPtr<nsISupportsString> dataWrapper0 ( do_QueryInterface(aFromData) );
    if (!dataWrapper0) {
      return NS_ERROR_INVALID_ARG;
    }

    nsAutoString dataStr;
    dataWrapper0->GetData ( dataStr );  // COPY #1
    // note: conversion to text/plain is done inside the clipboard. we do not need to worry
    // about it here.
    if ( toFlavor.Equals(kHTMLMime) || toFlavor.Equals(kUnicodeMime) ) {
      nsresult res;
      if (toFlavor.Equals(kHTMLMime)) {
        int32_t dataLen = dataStr.Length() * 2;
        nsPrimitiveHelpers::CreatePrimitiveForData ( toFlavor, dataStr.get(), dataLen, aToData );
        if ( *aToData )
          *aDataToLen = dataLen;
      } else {
        nsAutoString outStr;
        res = ConvertFromHTMLToUnicode(dataStr, outStr);
        if (NS_SUCCEEDED(res)) {
          int32_t dataLen = outStr.Length() * 2;
          nsPrimitiveHelpers::CreatePrimitiveForData ( toFlavor, outStr.get(), dataLen, aToData );
          if ( *aToData )
            *aDataToLen = dataLen;
        }
      }
    } // else if HTML or Unicode
    else if ( toFlavor.Equals(kAOLMailMime) ) {
      nsAutoString outStr;
      if ( NS_SUCCEEDED(ConvertFromHTMLToAOLMail(dataStr, outStr)) ) {
        int32_t dataLen = outStr.Length() * 2;
        nsPrimitiveHelpers::CreatePrimitiveForData ( toFlavor, outStr.get(), dataLen, aToData );
        if ( *aToData )
          *aDataToLen = dataLen;
      }
    } // else if AOL mail
    else {
      rv = NS_ERROR_FAILURE;
    }
  } // if we got html mime
  else
    rv = NS_ERROR_FAILURE;

  return rv;

} // Convert


//
// ConvertFromHTMLToUnicode
//
// Takes HTML and converts it to plain text but in unicode.
//
NS_IMETHODIMP
nsHTMLFormatConverter::ConvertFromHTMLToUnicode(const nsAutoString & aFromStr, nsAutoString & aToStr)
{
  return nsContentUtils::ConvertToPlainText(aFromStr,
    aToStr,
    nsIDocumentEncoder::OutputSelectionOnly |
    nsIDocumentEncoder::OutputAbsoluteLinks |
    nsIDocumentEncoder::OutputNoScriptContent |
    nsIDocumentEncoder::OutputNoFramesContent,
    0);
} // ConvertFromHTMLToUnicode


NS_IMETHODIMP
nsHTMLFormatConverter::ConvertFromHTMLToAOLMail(const nsAutoString & aFromStr,
                                                nsAutoString & aToStr)
{
  aToStr.AssignLiteral("<HTML>");
  aToStr.Append(aFromStr);
  aToStr.AppendLiteral("</HTML>");

  return NS_OK;
}