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mimemsg.cpp

/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#include "nsCOMPtr.h"
#include "nsIMimeEmitter.h"
#include "mimemsg.h"
#include "mimemoz2.h"
#include "prmem.h"
#include "prio.h"
#include "plstr.h"
#include "msgCore.h"
#include "prlog.h"
#include "prprf.h"
#include "nsCRT.h"
#include "nsMimeStringResources.h"
#include "nsMimeTypes.h"
#include "nsMsgMessageFlags.h"
#include "nsEscape.h"
#include "nsString.h"
#include "mimetext.h"
#include "mimecryp.h"
#include "mimetpfl.h"

#define MIME_SUPERCLASS mimeContainerClass
MimeDefClass(MimeMessage, MimeMessageClass, mimeMessageClass,
                   &MIME_SUPERCLASS);

static int MimeMessage_initialize (MimeObject *);
static void MimeMessage_finalize (MimeObject *);
static int MimeMessage_add_child (MimeObject *, MimeObject *);
static int MimeMessage_parse_begin (MimeObject *);
static int MimeMessage_parse_line (char *, PRInt32, MimeObject *);
static int MimeMessage_parse_eof (MimeObject *, PRBool);
static int MimeMessage_close_headers (MimeObject *obj);
static int MimeMessage_write_headers_html (MimeObject *);
static char *MimeMessage_partial_message_html(const char *data,
                                                                    void *closure,
                                                                    MimeHeaders *headers);

#ifdef MOZ_SECURITY
HG56268
#endif /* MOZ_SECURITY */

#ifdef XP_UNIX
extern void MimeHeaders_do_unix_display_hook_hack(MimeHeaders *);
#endif /* XP_UNIX */

#if defined(DEBUG) && defined(XP_UNIX)
static int MimeMessage_debug_print (MimeObject *, PRFileDesc *, PRInt32 depth);
#endif

extern MimeObjectClass mimeMultipartClass;

static int
MimeMessageClassInitialize(MimeMessageClass *clazz)
{
  MimeObjectClass    *oclass = (MimeObjectClass *)    clazz;
  MimeContainerClass *cclass = (MimeContainerClass *) clazz;

  PR_ASSERT(!oclass->class_initialized);
  oclass->initialize  = MimeMessage_initialize;
  oclass->finalize    = MimeMessage_finalize;
  oclass->parse_begin = MimeMessage_parse_begin;
  oclass->parse_line  = MimeMessage_parse_line;
  oclass->parse_eof   = MimeMessage_parse_eof;
  cclass->add_child   = MimeMessage_add_child;

#if defined(DEBUG) && defined(XP_UNIX)
  oclass->debug_print = MimeMessage_debug_print;
#endif
  return 0;
}


static int
MimeMessage_initialize (MimeObject *object)
{
  MimeMessage *msg = (MimeMessage *)object;
  msg->grabSubject = PR_FALSE;
  msg->bodyLength = 0;

  return ((MimeObjectClass*)&MIME_SUPERCLASS)->initialize(object);
}

static void
MimeMessage_finalize (MimeObject *object)
{
  MimeMessage *msg = (MimeMessage *)object;
  if (msg->hdrs)
      MimeHeaders_free(msg->hdrs);
  msg->hdrs = 0;
  ((MimeObjectClass*)&MIME_SUPERCLASS)->finalize(object);
}

static int
MimeMessage_parse_begin (MimeObject *obj)
{
  MimeMessage *msg = (MimeMessage *)obj;

  int status = ((MimeObjectClass*)&MIME_SUPERCLASS)->parse_begin(obj);
  if (status < 0) return status;

  if (obj->parent)
  {
    msg->grabSubject = PR_TRUE;
  }

  /* Messages have separators before the headers, except for the outermost
       message. */
  return MimeObject_write_separator(obj);
}


static int
MimeMessage_parse_line (char *aLine, PRInt32 aLength, MimeObject *obj)
{
  char * line = aLine;
  PRInt32 length = aLength;

  MimeMessage *msg = (MimeMessage *) obj;
  int status = 0;

  PR_ASSERT(line && *line);
  if (!line || !*line) return -1;

#ifdef MOZ_SECURITY
  HG11013
#endif /* MOZ_SECURITY */

  if (msg->grabSubject)
  {
    if ( (!PL_strncasecmp(line, "Subject: ", 9)) && (obj->parent) )
    {
      if ( (obj->headers) && (!obj->headers->munged_subject) )
      {
        obj->headers->munged_subject = (char *) PL_strndup(line + 9, length - 9);
        char *tPtr = obj->headers->munged_subject;
        while (*tPtr)
        {
          if ( (*tPtr == nsCRT::CR) || (*tPtr == nsCRT::LF) )
          {
            *tPtr = '\0';
            break;
          }
          tPtr++;
        }
      }
    }
  }

  /* If we already have a child object, then we're done parsing headers,
       and all subsequent lines get passed to the inferior object without
       further processing by us.  (Our parent will stop feeding us lines
       when this MimeMessage part is out of data.)
   */
  if (msg->container.nchildren)
      {
        MimeObject *kid = msg->container.children[0];
        PRBool nl;
        PR_ASSERT(kid);
        if (!kid) return -1;

          msg->bodyLength += length;

        /* Don't allow MimeMessage objects to not end in a newline, since it
             would be inappropriate for any following part to appear on the same
             line as the last line of the message.

             #### This assumes that the only time the `parse_line' method is
             called with a line that doesn't end in a newline is when that line
             is the last line.
         */
        nl = (length > 0 && (line[length-1] == nsCRT::CR || line[length-1] == nsCRT::LF));

#ifdef MIME_DRAFTS
        if ( !mime_typep (kid, (MimeObjectClass*) &mimeMessageClass) &&
               obj->options &&
               obj->options->decompose_file_p &&
               ! obj->options->is_multipart_msg &&
               obj->options->decompose_file_output_fn )
            {
              if (!obj->options->decrypt_p) {
        //if we are processing a flowed plain text line, we need to remove any stuffed space
        if (length > 0 && ' ' == *line && mime_typep(kid, (MimeObjectClass *)&mimeInlineTextPlainFlowedClass))
        {
          line ++;
          length --;
        }
                    status = obj->options->decompose_file_output_fn (line,
                                                                                             length,
                                                                               obj->options->stream_closure);
                    if (status < 0) return status;
                    if (!nl) {
                        status = obj->options->decompose_file_output_fn (MSG_LINEBREAK,
                                                                                                 MSG_LINEBREAK_LEN,
                                                                               obj->options->stream_closure);
                        if (status < 0) return status;
                    }
                    return status;
              }
            }
#endif /* MIME_DRAFTS */


        if (nl)
            return kid->clazz->parse_buffer (line, length, kid);
        else
            {
              /* Hack a newline onto the end. */
              char *s = (char *)PR_MALLOC(length + MSG_LINEBREAK_LEN + 1);
              if (!s) return MIME_OUT_OF_MEMORY;
              memcpy(s, line, length);
              PL_strcpy(s + length, MSG_LINEBREAK);
              status = kid->clazz->parse_buffer (s, length + MSG_LINEBREAK_LEN, kid);
              PR_Free(s);
              return status;
            }
      }

  /* Otherwise we don't yet have a child object, which means we're not
       done parsing our headers yet.
   */
  if (!msg->hdrs)
      {
        msg->hdrs = MimeHeaders_new();
        if (!msg->hdrs) return MIME_OUT_OF_MEMORY;
      }

#ifdef MIME_DRAFTS
  if ( obj->options &&
           obj->options->decompose_file_p &&
           ! obj->options->is_multipart_msg &&
           obj->options->done_parsing_outer_headers &&
           obj->options->decompose_file_output_fn ) 
  {
      status =  obj->options->decompose_file_output_fn( line, length,
                                                                                                  obj->options->stream_closure );
      if (status < 0) 
      return status;
  }
#endif /* MIME_DRAFTS */

  status = MimeHeaders_parse_line(line, length, msg->hdrs);
  if (status < 0) return status;

  /* If this line is blank, we're now done parsing headers, and should
       examine our content-type to create our "body" part.
   */
  if (*line == nsCRT::CR || *line == nsCRT::LF)
      {
        status = MimeMessage_close_headers(obj);
        if (status < 0) return status;
      }

  return 0;
}

static int
MimeMessage_close_headers (MimeObject *obj)
{
  MimeMessage *msg = (MimeMessage *) obj;
  int status = 0;
  char *ct = 0;               /* Content-Type header */
  MimeObject *body;

  if (msg->hdrs)
      {
        PRBool outer_p = !obj->headers; /* is this the outermost message? */


#ifdef MIME_DRAFTS
        if (outer_p &&
              obj->options &&
          (obj->options->decompose_file_p || obj->options->caller_need_root_headers) &&
              obj->options->decompose_headers_info_fn)
            {
#ifdef ENABLE_SMIME
      if (obj->options->decrypt_p && !mime_crypto_object_p (msg->hdrs, PR_FALSE))
        obj->options->decrypt_p = PR_FALSE;
#endif /* ENABLE_SMIME */
      if (!obj->options->caller_need_root_headers || (obj == obj->options->state->root))
                  status = obj->options->decompose_headers_info_fn (
                                                                         obj->options->stream_closure,
                                                                                           msg->hdrs );
            }
#endif /* MIME_DRAFTS */


        /* If this is the outermost message, we need to run the
             `generate_header' callback.  This happens here instead of
             in `parse_begin', because it's only now that we've parsed
             our headers.  However, since this is the outermost message,
             we have yet to write any HTML, so that's fine.
         */
        if (outer_p &&
              obj->output_p &&
              obj->options &&
              obj->options->write_html_p &&
              obj->options->generate_header_html_fn)
            {
              int lstatus = 0;
              char *html = 0;

              /* The generate_header_html_fn might return HTML, so it's important
                   that the output stream be set up with the proper type before we
                   make the MimeObject_write() call below. */
              if (!obj->options->state->first_data_written_p)
                  {
                    lstatus = MimeObject_output_init (obj, TEXT_HTML);
                    if (lstatus < 0) return lstatus;
                    PR_ASSERT(obj->options->state->first_data_written_p);
                  }

              html = obj->options->generate_header_html_fn(NULL,
                                                                           obj->options->html_closure,
                                                                                 msg->hdrs);
              if (html)
                  {
                    lstatus = MimeObject_write(obj, html, strlen(html), PR_FALSE);
                    PR_Free(html);
                    if (lstatus < 0) return lstatus;
                  }
            }


        /* Find the content-type of the body of this message.
         */
        {
            PRBool ok = PR_TRUE;
            char *mv = MimeHeaders_get (msg->hdrs, HEADER_MIME_VERSION,
                                                      PR_TRUE, PR_FALSE);

#ifdef REQUIRE_MIME_VERSION_HEADER
            /* If this is the outermost message, it must have a MIME-Version
               header with the value 1.0 for us to believe what might be in
               the Content-Type header.  If the MIME-Version header is not
               present, we must treat this message as untyped.
             */
            ok = (mv && !nsCRT::strcmp(mv, "1.0"));
#else
            /* #### actually, we didn't check this in Mozilla 2.0, and checking
               it now could cause some compatibility nonsense, so for now, let's
               just believe any Content-Type header we see.
             */
            ok = PR_TRUE;
#endif

            if (ok)
              {
                  ct = MimeHeaders_get (msg->hdrs, HEADER_CONTENT_TYPE, PR_TRUE, PR_FALSE);

                  /* If there is no Content-Type header, but there is a MIME-Version
                     header, then assume that this *is* in fact a MIME message.
                     (I've seen messages with

                          MIME-Version: 1.0
                          Content-Transfer-Encoding: quoted-printable

                     and no Content-Type, and we should treat those as being of type
                     MimeInlineTextPlain rather than MimeUntypedText.)
                   */
                  if (mv && !ct)
                    ct = nsCRT::strdup(TEXT_PLAIN);
              }

            PR_FREEIF(mv);  /* done with this now. */
        }

    /* If this message has a body which is encrypted and we're going to
       decrypt it (whithout converting it to HTML, since decrypt_p and
       write_html_p are never true at the same time)
    */
    if (obj->output_p &&
        obj->options &&
        obj->options->decrypt_p
#ifdef ENABLE_SMIME
        && !mime_crypto_object_p (msg->hdrs, PR_FALSE)
#endif /* ENABLE_SMIME */
        )
    {
      /* The body of this message is not an encrypted object, so we need
         to turn off the decrypt_p flag (to prevent us from s#$%ing the
         body of the internal object up into one.) In this case,
         our output will end up being identical to our input.
      */
      obj->options->decrypt_p = PR_FALSE;
    }

        /* Emit the HTML for this message's headers.  Do this before
             creating the object representing the body.
         */
        if (obj->output_p &&
              obj->options &&
              obj->options->write_html_p)
            {
              /* If citation headers are on, and this is not the outermost message,
                   turn them off. */
              if (obj->options->headers == MimeHeadersCitation && !outer_p)
                  obj->options->headers = MimeHeadersSome;

              /* Emit a normal header block. */
              status = MimeMessage_write_headers_html(obj);
              if (status < 0) return status;
            }
        else if (obj->output_p)
            {
              /* Dump the headers, raw. */
              status = MimeObject_write(obj, "", 0, PR_FALSE);  /* initialize */
              if (status < 0) return status;
              status = MimeHeaders_write_raw_headers(msg->hdrs, obj->options,
                                                                         obj->options->decrypt_p);
              if (status < 0) return status;
            }

#ifdef XP_UNIX
        if (outer_p && obj->output_p)
            /* Kludge from mimehdrs.c */
            MimeHeaders_do_unix_display_hook_hack(msg->hdrs);
#endif /* XP_UNIX */
      }

  /* Never put out a separator after a message header block. */
  if (obj->options && obj->options->state)
      obj->options->state->separator_suppressed_p = PR_TRUE;

#ifdef MIME_DRAFTS
  if ( !obj->headers &&    /* outer most message header */
         obj->options && 
         obj->options->decompose_file_p && 
         ct )
      obj->options->is_multipart_msg = PL_strcasestr(ct, "multipart/") != NULL;
#endif /* MIME_DRAFTS */


  body = mime_create(ct, msg->hdrs, obj->options);

  PR_FREEIF(ct);
  if (!body) return MIME_OUT_OF_MEMORY;
  status = ((MimeContainerClass *) obj->clazz)->add_child (obj, body);
  if (status < 0)
      {
        mime_free(body);
        return status;
      }
  
  // Only do this if this is a Text Object!
  if ( mime_typep(body, (MimeObjectClass *) &mimeInlineTextClass) )
  {
    ((MimeInlineText *) body)->needUpdateMsgWinCharset = PR_TRUE;
  }

  /* Now that we've added this new object to our list of children,
       start its parser going. */
  status = body->clazz->parse_begin(body);
  if (status < 0) return status;

  // Now notify the emitter if this is the outer most message, unless
  // it is a part that is not the head of the message. If it's a part, 
  // we need to figure out the content type/charset of the part
  //
  PRBool outer_p = !obj->headers;   /* is this the outermost message? */

  if ( outer_p &&
       (!obj->options->part_to_load || obj->options->format_out == nsMimeOutput::nsMimeMessageBodyDisplay))
  {
    // call SetMailCharacterSetToMsgWindow() to set a menu charset
    if (mime_typep(body, (MimeObjectClass *) &mimeInlineTextClass))
    {
      MimeInlineText  *text = (MimeInlineText *) body;
      if (text && text->charset && *text->charset)
        SetMailCharacterSetToMsgWindow(body, text->charset);
    }

    char  *msgID = MimeHeaders_get (msg->hdrs, HEADER_MESSAGE_ID,
                                                                        PR_FALSE, PR_FALSE);

    char  *outCharset = NULL;
    if (!obj->options->force_user_charset)  /* Only convert if the user prefs is false */
      outCharset = "UTF-8";

    mimeEmitterStartBody(obj->options, (obj->options->headers == MimeHeadersNone), msgID, outCharset);
    PR_FREEIF(msgID);

      // setting up truncated message html fotter function
      char *xmoz = MimeHeaders_get(msg->hdrs, HEADER_X_MOZILLA_STATUS, PR_FALSE,
                                                 PR_FALSE);
      if (xmoz)
      {
            PRUint32 flags = 0;
            char dummy = 0;
            if (sscanf(xmoz, " %lx %c", &flags, &dummy) == 1 &&
                  flags & MSG_FLAG_PARTIAL)
            {
                  obj->options->html_closure = obj;
                  obj->options->generate_footer_html_fn =
                        MimeMessage_partial_message_html;
            }
            PR_FREEIF(xmoz);
      }
  }

  return 0;
}



static int 
MimeMessage_parse_eof (MimeObject *obj, PRBool abort_p)
{
  int status;
  PRBool outer_p;
  MimeMessage *msg = (MimeMessage *)obj;
  if (obj->closed_p) return 0;
  
  /* Run parent method first, to flush out any buffered data. */
  status = ((MimeObjectClass*)&MIME_SUPERCLASS)->parse_eof(obj, abort_p);
  if (status < 0) return status;

  outer_p = !obj->headers;    /* is this the outermost message? */

  // Hack for messages with truncated headers (bug 244722)
  // If there is no empty line in a message, the parser can't figure out where
  // the headers end, causing parsing to hang. So we insert an extra newline
  // to keep it happy. This is OK, since a message without any empty lines is
  // broken anyway...
  if(outer_p && msg->hdrs && ! msg->hdrs->done_p) {
    MimeMessage_parse_line("\n", 1, obj);
  }

  // Once we get to the end of parsing the message, we will notify
  // the emitter that we are done the the body.

  // Mark the end of the mail body if we are actually emitting the
  // body of the message (i.e. not Header ONLY)
  if (outer_p && obj->options && obj->options->write_html_p)
  {
        if (obj->options->generate_footer_html_fn)
        {
              mime_stream_data *msd = 
                    (mime_stream_data *) obj->options->stream_closure;
              if (msd)
              {
                    char *html = obj->options->generate_footer_html_fn
                          (msd->orig_url_name, obj->options->html_closure, msg->hdrs);
                    if (html)
                    {
                          int lstatus = MimeObject_write(obj, html,
                                                                         strlen(html),
                                                                         PR_FALSE);
                          PR_Free(html);
                          if (lstatus < 0) return lstatus;
                    }
              }
        }
        if ((!obj->options->part_to_load  || obj->options->format_out == nsMimeOutput::nsMimeMessageBodyDisplay) && 
              obj->options->headers != MimeHeadersOnly)
              mimeEmitterEndBody(obj->options);
  }

#ifdef MIME_DRAFTS
  if ( obj->options &&
         obj->options->decompose_file_p &&
         obj->options->done_parsing_outer_headers &&
         ! obj->options->is_multipart_msg &&
         ! mime_typep(obj, (MimeObjectClass*) &mimeEncryptedClass) &&
         obj->options->decompose_file_close_fn ) {
      status = obj->options->decompose_file_close_fn (
                                                                     obj->options->stream_closure );

      if ( status < 0 ) return status;
  }
#endif /* MIME_DRAFTS */


  /* Put out a separator after every message/rfc822 object. */
  if (!abort_p && !outer_p)
      {
        status = MimeObject_write_separator(obj);
        if (status < 0) return status;
      }

  return 0;
}


static int
MimeMessage_add_child (MimeObject *parent, MimeObject *child)
{
  MimeContainer *cont = (MimeContainer *) parent;
  PR_ASSERT(parent && child);
  if (!parent || !child) return -1;

  /* message/rfc822 containers can only have one child. */
  PR_ASSERT(cont->nchildren == 0);
  if (cont->nchildren != 0) return -1;

#ifdef MIME_DRAFTS
  if ( parent->options &&
         parent->options->decompose_file_p &&
         ! parent->options->is_multipart_msg &&
         ! mime_typep(child, (MimeObjectClass*) &mimeEncryptedClass) &&
         parent->options->decompose_file_init_fn ) {
      int status = 0;
      status = parent->options->decompose_file_init_fn (
                                                                    parent->options->stream_closure,
                                                                    ((MimeMessage*)parent)->hdrs );
      if ( status < 0 ) return status;
  }
#endif /* MIME_DRAFTS */
  
  return ((MimeContainerClass*)&MIME_SUPERCLASS)->add_child (parent, child);
}

// This is necessary to determine which charset to use for a reply/forward
char *
DetermineMailCharset(MimeMessage *msg)
{
  char          *retCharset = nsnull;
  
  if ( (msg) && (msg->hdrs) )
  {
    char *ct = MimeHeaders_get (msg->hdrs, HEADER_CONTENT_TYPE,
                                PR_FALSE, PR_FALSE);
    if (ct)
    {
      retCharset = MimeHeaders_get_parameter (ct, "charset", NULL, NULL);
      PR_Free(ct);
    }
    
    if (!retCharset)
    {
      // If we didn't find "Content-Type: ...; charset=XX" then look
      // for "X-Sun-Charset: XX" instead.  (Maybe this should be done
      // in MimeSunAttachmentClass, but it's harder there than here.)
      retCharset = MimeHeaders_get (msg->hdrs, HEADER_X_SUN_CHARSET,
                                    PR_FALSE, PR_FALSE);
    }    
  }
  
  if (!retCharset)
    return nsCRT::strdup("ISO-8859-1");
  else
    return retCharset;
}

static int
MimeMessage_write_headers_html (MimeObject *obj)
{
  MimeMessage     *msg = (MimeMessage *) obj;
  int             status;

#ifdef MOZ_SECURITY
  HG33391
#endif /* MOZ_SECURITY */  

  if (!obj->options || !obj->options->output_fn)
      return 0;

  PR_ASSERT(obj->output_p && obj->options->write_html_p);

  // To support the no header option! Make sure we are not
  // suppressing headers on included email messages...
  if ( (obj->options->headers == MimeHeadersNone) &&
       (obj == obj->options->state->root) )
  {
    // Ok, we are going to kick the Emitter for a StartHeader
    // operation ONLY WHEN THE CHARSET OF THE ORIGINAL MESSAGE IS
    // NOT US-ASCII ("ISO-8859-1")
    //
    // This is only to notify the emitter of the charset of the 
    // original message
    char    *mailCharset = DetermineMailCharset(msg);

    if ( (mailCharset) && (PL_strcasecmp(mailCharset, "US-ASCII")) &&
         (PL_strcasecmp(mailCharset, "ISO-8859-1")) )
      mimeEmitterUpdateCharacterSet(obj->options, mailCharset);
    PR_FREEIF(mailCharset);
    return 0;
  }

  if (!obj->options->state->first_data_written_p)
      {
        status = MimeObject_output_init (obj, TEXT_HTML);
        if (status < 0) 
    {
      mimeEmitterEndHeader(obj->options);
      return status;
    }
        PR_ASSERT(obj->options->state->first_data_written_p);
      }

  // Start the header parsing by the emitter
  char *msgID = MimeHeaders_get (msg->hdrs, HEADER_MESSAGE_ID,
                                                                        PR_FALSE, PR_FALSE);
  PRBool outer_p = !obj->headers; /* is this the outermost message? */
  if (!outer_p && obj->options->format_out == nsMimeOutput::nsMimeMessageBodyDisplay &&
      obj->options->part_to_load)
  {
    //Maybe we are displaying a embedded message as outer part!
    char *id = mime_part_address(obj);
    if (id)
    {
      outer_p = !strcmp(id, obj->options->part_to_load);
      PR_Free(id);
    }
  }

  // Ok, we should really find out the charset of this part. We always
  // output UTF-8 for display, but the original charset is necessary for
  // reply and forward operations.
  //
  char    *mailCharset = DetermineMailCharset(msg);
  mimeEmitterStartHeader(obj->options, 
                            outer_p, 
                            (obj->options->headers == MimeHeadersOnly),
                            msgID,
                            mailCharset);
  PR_FREEIF(msgID);
  PR_FREEIF(mailCharset);

#ifdef MOZ_SECURITY
    HG00919 
#endif /* MOZ_SECURITY */

  status = MimeHeaders_write_all_headers (msg->hdrs, obj->options, PR_FALSE);
  if (status < 0) 
  {
    mimeEmitterEndHeader(obj->options);
    return status;
  }

  if (msg->crypto_stamped_p)
  {
#ifdef MOZ_SECURITY
    HG11995
#endif /* MOZ_SECURITY */       
  }
  else
  {
  /* If we're not writing a xlation stamp, and this is the outermost
  message, then now is the time to run the post_header_html_fn.
  (Otherwise, it will be run when the xlation-stamp is finally
  closed off, in MimeXlateed_emit_buffered_child() or
  MimeMultipartSigned_emit_child().)
         */
    if (obj->options &&
      obj->options->state &&
      obj->options->generate_post_header_html_fn &&
      !obj->options->state->post_header_html_run_p)
    {
      char *html = 0;
      PR_ASSERT(obj->options->state->first_data_written_p);
      html = obj->options->generate_post_header_html_fn(NULL,
                                          obj->options->html_closure,
                                          msg->hdrs);
      obj->options->state->post_header_html_run_p = PR_TRUE;
      if (html)
      {
        status = MimeObject_write(obj, html, strlen(html), PR_FALSE);
        PR_Free(html);
        if (status < 0) 
        {
          mimeEmitterEndHeader(obj->options);
          return status;
        }
      }
    }    
  }

  mimeEmitterEndHeader(obj->options);

  // rhp:
  // For now, we are going to parse the entire message, even if we are
  // only interested in headers...why? Well, because this is the only
  // way to build the attachment list. Now we will have the attachment
  // list in the output being created by the XML emitter. If we ever
  // want to go back to where we were before, just uncomment the conditional
  // and it will stop at header parsing.
  //
  // if (obj->options->headers == MimeHeadersOnly)
  //   return -1;
  // else

  return 0;
}

static char *
MimeMessage_partial_message_html(const char *data, void *closure,
                                                 MimeHeaders *headers)
{
  MimeMessage *msg = (MimeMessage *)closure;
  nsCAutoString orig_url(data);
  char *partialMsgHtml = nsnull;
  char *uidl = MimeHeaders_get(headers, HEADER_X_UIDL, PR_FALSE, PR_FALSE);
  char *msgId = MimeHeaders_get(headers, HEADER_MESSAGE_ID, PR_FALSE,
                                                  PR_FALSE);
  char *msgIdPtr = PL_strstr(msgId, "<");
  int msgBase;

  orig_url.ReplaceSubstring("mailbox-message", "mailbox");
  orig_url.ReplaceSubstring("#", "?number=");

  if (msgIdPtr)
    msgIdPtr++;
  else
    msgIdPtr = msgId;
  char *gtPtr = PL_strstr(msgIdPtr, ">");
  if (gtPtr)
    *gtPtr = 0;

  msgBase = (msg->bodyLength > MSG_LINEBREAK_LEN) ? MIME_MSG_PARTIAL_FMT_1 : MIME_MSG_PARTIAL_FMT2_1;
  char *escapedUidl = uidl ? nsEscape(uidl, url_XAlphas) : nsnull;
  char *escapedMsgId = msgIdPtr ? nsEscape(msgIdPtr, url_Path) : nsnull;
  char *fmt1 = MimeGetStringByID(msgBase);
  char *fmt2 = MimeGetStringByID(msgBase+1);
  char *fmt3 = MimeGetStringByID(msgBase+2);
  char *msgUrl = PR_smprintf("%s&messageid=%s&uidl=%s",
                             orig_url.get(), escapedMsgId, escapedUidl);
  partialMsgHtml = PR_smprintf("%s%s%s%s", fmt1,fmt2, msgUrl, fmt3);
  PR_Free(uidl);
  PR_Free(escapedUidl);
  PR_Free(msgId);
  PR_Free(escapedMsgId);
  PR_Free(msgUrl);
  PR_Free(fmt1);
  PR_Free(fmt2);
  PR_Free(fmt3);

      return partialMsgHtml;
}

#if defined(DEBUG) && defined(XP_UNIX)
static int
MimeMessage_debug_print (MimeObject *obj, PRFileDesc *stream, PRInt32 depth)
{
  MimeMessage *msg = (MimeMessage *) obj;
  char *addr = mime_part_address(obj);
  int i;
  for (i=0; i < depth; i++)
      PR_Write(stream, "  ", 2);
/*
  fprintf(stream, "<%s %s%s 0x%08X>\n",
              obj->clazz->class_name,
              addr ? addr : "???",
              (msg->container.nchildren == 0 ? " (no body)" : ""),
              (PRUint32) msg);
*/
  PR_FREEIF(addr);

#if 0
  if (msg->hdrs)
      {
        char *s;

        depth++;

# define DUMP(HEADER) \
        for (i=0; i < depth; i++)                                                                     \
        PR_Write(stream, "  ", 2);                                                                    \
        s = MimeHeaders_get (msg->hdrs, HEADER, PR_FALSE, PR_TRUE);
/**
    \
        PR_Write(stream, HEADER ": %s\n", s ? s : "");                                          \
**/

        PR_FREEIF(s)

      DUMP(HEADER_SUBJECT);
      DUMP(HEADER_DATE);
      DUMP(HEADER_FROM);
      DUMP(HEADER_TO);
      /* DUMP(HEADER_CC); */
      DUMP(HEADER_NEWSGROUPS);
      DUMP(HEADER_MESSAGE_ID);
# undef DUMP

        PR_Write(stream, "\n", 1);
      }
#endif

  PR_ASSERT(msg->container.nchildren <= 1);
  if (msg->container.nchildren == 1)
      {
        MimeObject *kid = msg->container.children[0];
        int status = kid->clazz->debug_print (kid, stream, depth+1);
        if (status < 0) return status;
      }
  return 0;
}
#endif

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