nsresult
nsExpatDriver::HandleStartDoctypeDecl(const PRUnichar* aDoctypeName,
                                      const PRUnichar* aSysid,
                                      const PRUnichar* aPubid,
                                      PRBool aHasInternalSubset)
{
  mDoctypeName = aDoctypeName;
  mSystemID = aSysid;
  mPublicID = aPubid;

  if (mExtendedSink) {
    nsresult rv = mExtendedSink->HandleStartDTD(aDoctypeName, aSysid, aPubid);
    MaybeStopParser(rv);
  }

  if (aHasInternalSubset) {
    // Consuming a huge internal subset translates to numerous
    // allocations. In an effort to avoid too many allocations
    // setting mInternalSubset's capacity to be 1K ( just a guesstimate! ).
    mInInternalSubset = PR_TRUE;
    mInternalSubset.SetCapacity(1024);
  } else {
    // Distinguish missing internal subset from an empty one
    mInternalSubset.SetIsVoid(PR_TRUE);
  }

  return NS_OK;
}

nsresult
nsExpatDriver::HandleEndDoctypeDecl()
{
  NS_ASSERTION(mSink, "content sink not found!");

  mInInternalSubset = PR_FALSE;

  if (mSink) {
    // let the sink know any additional knowledge that we have about the
    // document (currently, from bug 124570, we only expect to pass additional
    // agent sheets needed to layout the XML vocabulary of the document)
    nsCOMPtr<nsIURI> data;
    if (mCatalogData && mCatalogData->mAgentSheet) {
      NS_NewURI(getter_AddRefs(data), mCatalogData->mAgentSheet);
    }

    // Note: mInternalSubset already doesn't include the [] around it.
    nsresult rv = mSink->HandleDoctypeDecl(mInternalSubset, mDoctypeName,
                                           mSystemID, mPublicID, data);
    MaybeStopParser(rv);
  }
  
  mInternalSubset.SetCapacity(0);

  return NS_OK;
}

nsresult
nsExpatDriver::HandleEndDoctypeDecl()
{
  NS_ASSERTION(mSink, "content sink not found!");

  mInInternalSubset = false;

  if (mSink) {
    // let the sink know any additional knowledge that we have about the
    // document (currently, from bug 124570, we only expect to pass additional
    // agent sheets needed to layout the XML vocabulary of the document)
    nsCOMPtr<nsIURI> data;
#if 0
    if (mCatalogData && mCatalogData->mAgentSheet) {
      NS_NewURI(getter_AddRefs(data), mCatalogData->mAgentSheet);
    }
#endif

    // The unused support for "catalog style sheets" was removed. It doesn't
    // look like we'll ever fix bug 98413 either.
    MOZ_ASSERT(!mCatalogData || !mCatalogData->mAgentSheet,
               "Need to add back support for catalog style sheets");

    // Note: mInternalSubset already doesn't include the [] around it.
    nsresult rv = mSink->HandleDoctypeDecl(mInternalSubset, mDoctypeName,
                                           mSystemID, mPublicID, data);
    MaybeStopParser(rv);
  }
  
  mInternalSubset.SetCapacity(0);

  return NS_OK;
}

nsresult
nsExpatDriver::HandleUnparsedEntityDecl(const char16_t* aEntityName,
                                        const char16_t* aBase,
                                        const char16_t* aSysid,
                                        const char16_t* aPubid,
                                        const char16_t* aNotationName)
{
  if (mExtendedSink) {
    nsresult rv = mExtendedSink->HandleUnparsedEntityDecl(aEntityName,
                                                          aSysid,
                                                          aPubid,
                                                          aNotationName);
    MaybeStopParser(rv);
  }
  return NS_OK;
}