path: root/mail/mail-format.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */

/*
 * Authors:
 *  Dan Winship <danw@ximian.com>
 *
 *  Copyright 2000, 2001 Ximian, Inc.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <ctype.h>    /* for isprint */
#include <string.h>   /* for strstr  */
#include <fcntl.h>

#include <liboaf/liboaf.h>
#include <libgnome/gnome-defs.h>
#include <libgnome/gnome-util.h>
#include <libgnomevfs/gnome-vfs-mime-info.h>
#include <libgnomevfs/gnome-vfs-mime-handlers.h>
#include <gal/widgets/e-unicode.h>
#include <gal/util/e-iconv.h>

#include <camel/camel-mime-utils.h>
#include <camel/camel-pgp-mime.h>
#include <camel/camel-stream-null.h>
#include <camel/camel-multipart-signed.h>
#include <shell/e-setup.h>
#include <e-util/e-html-utils.h>
#include <gal/util/e-unicode-i18n.h>

#include "mail.h"
#include "mail-tools.h"
#include "mail-display.h"
#include "mail-mt.h"
#include "mail-crypto.h"

static char *try_inline_pgp (char *start, CamelMimePart *part,
                 guint offset, MailDisplay *md, GtkHTML *html, GtkHTMLStream *stream);
static char *try_inline_pgp_sig (char *start, CamelMimePart *part,
                 guint offset, MailDisplay *md, GtkHTML *html, GtkHTMLStream *stream);
static char *try_uudecoding (char *start, CamelMimePart *part,
                 guint offset, MailDisplay *md, GtkHTML *html, GtkHTMLStream *stream);
static char *try_inline_binhex (char *start, CamelMimePart *part,
                guint offset, MailDisplay *md, GtkHTML *html, GtkHTMLStream *stream);

static gboolean handle_text_plain            (CamelMimePart *part,
                          const char *mime_type,
                          MailDisplay *md, GtkHTML *html, GtkHTMLStream *stream);
static gboolean handle_text_plain_flowed     (char *text,
                          MailDisplay *md, GtkHTML *html, GtkHTMLStream *stream);
static gboolean handle_text_enriched         (CamelMimePart *part,
                          const char *mime_type,
                          MailDisplay *md, GtkHTML *html, GtkHTMLStream *stream);
static gboolean handle_text_html             (CamelMimePart *part,
                          const char *mime_type,
                          MailDisplay *md, GtkHTML *html, GtkHTMLStream *stream);
static gboolean handle_image                 (CamelMimePart *part,
                          const char *mime_type,
                          MailDisplay *md, GtkHTML *html, GtkHTMLStream *stream);
static gboolean handle_multipart_mixed       (CamelMimePart *part,
                          const char *mime_type,
                          MailDisplay *md, GtkHTML *html, GtkHTMLStream *stream);
static gboolean handle_multipart_related     (CamelMimePart *part,
                          const char *mime_type,
                          MailDisplay *md, GtkHTML *html, GtkHTMLStream *stream);
static gboolean handle_multipart_alternative (CamelMimePart *part,
                          const char *mime_type,
                          MailDisplay *md, GtkHTML *html, GtkHTMLStream *stream);
static gboolean handle_multipart_appledouble (CamelMimePart *part,
                          const char *mime_type,
                          MailDisplay *md, GtkHTML *html, GtkHTMLStream *stream);
static gboolean handle_multipart_encrypted   (CamelMimePart *part,
                          const char *mime_type,
                          MailDisplay *md, GtkHTML *html, GtkHTMLStream *stream);
static gboolean handle_multipart_signed      (CamelMimePart *part,
                          const char *mime_type,
                          MailDisplay *md, GtkHTML *html, GtkHTMLStream *stream);
static gboolean handle_multipart_digest      (CamelMimePart *part,
                          const char *mime_type,
                          MailDisplay *md, GtkHTML *html, GtkHTMLStream *stream);
static gboolean handle_message_rfc822        (CamelMimePart *part,
                          const char *mime_type,
                          MailDisplay *md, GtkHTML *html, GtkHTMLStream *stream);
static gboolean handle_message_external_body (CamelMimePart *part,
                          const char *mime_type,
                          MailDisplay *md, GtkHTML *html, GtkHTMLStream *stream);

static gboolean handle_via_bonobo            (CamelMimePart *part,
                          const char *mime_type,
                          MailDisplay *md, GtkHTML *html, GtkHTMLStream *stream);

/* writes the header info for a mime message into an html stream */
static void write_headers (CamelMimeMessage *message, MailDisplay *md,
               GtkHTML *html, GtkHTMLStream *stream);

/* dispatch html printing via mimetype */
static gboolean format_mime_part (CamelMimePart *part, MailDisplay *md,
                  GtkHTML *html, GtkHTMLStream *stream);

static void
free_url (gpointer key, gpointer value, gpointer data)
{
    g_free (key);
    if (data)
        g_byte_array_free (value, TRUE);
}

static void
free_part_urls (gpointer urls)
{
    g_hash_table_foreach (urls, free_url, NULL);
    g_hash_table_destroy (urls);
}

static void
free_data_urls (gpointer urls)
{
    g_hash_table_foreach (urls, free_url, GINT_TO_POINTER (1));
    g_hash_table_destroy (urls);
}

/**
 * mail_format_mime_message: 
 * @mime_message: the input mime message
 * @md: the MailDisplay to render into
 *
 * Writes a CamelMimeMessage out into a MailDisplay
 **/
void
mail_format_mime_message (CamelMimeMessage *mime_message, MailDisplay *md,
              GtkHTML *html, GtkHTMLStream *stream)
{
    GHashTable *hash;
    
    g_return_if_fail (CAMEL_IS_MIME_MESSAGE (mime_message));

    hash = g_datalist_get_data (md->data, "part_urls");
    if (!hash) {
        hash = g_hash_table_new (g_str_hash, g_str_equal);
        g_datalist_set_data_full (md->data, "part_urls", hash,
                      free_part_urls);
    }
    hash = g_datalist_get_data (md->data, "data_urls");
    if (!hash) {
        hash = g_hash_table_new (g_str_hash, g_str_equal);
        g_datalist_set_data_full (md->data, "data_urls", hash,
                      free_data_urls);
    }
    
    hash = g_datalist_get_data (md->data, "attachment_states");
    if (!hash) {
        hash = g_hash_table_new (NULL, NULL);
        g_datalist_set_data_full (md->data, "attachment_states", hash,
                      (GDestroyNotify) g_hash_table_destroy);
    }
    hash = g_datalist_get_data (md->data, "fake_parts");
    if (!hash) {
        hash = g_hash_table_new (NULL, NULL);
        g_datalist_set_data_full (md->data, "fake_parts", hash,
                      (GDestroyNotify) g_hash_table_destroy);
    }
    
    write_headers (mime_message, md, html, stream);
    format_mime_part (CAMEL_MIME_PART (mime_message), md, html, stream);
}


/**
 * mail_format_raw_message: 
 * @mime_message: the input mime message
 * @md: the MailDisplay to render into
 *
 * Writes a CamelMimeMessage source out into a MailDisplay
 **/
void
mail_format_raw_message (CamelMimeMessage *mime_message, MailDisplay *md,
             GtkHTML *html, GtkHTMLStream *stream)
{
    GByteArray *bytes;
    char *html_str;
    
    g_return_if_fail (CAMEL_IS_MIME_MESSAGE (mime_message));
    
    if (!mail_content_loaded (CAMEL_DATA_WRAPPER (mime_message), md,
                  TRUE, NULL, html, NULL))
        return;
    
    mail_html_write (html, stream,
             "<table cellspacing=0 cellpadding=10 width=\"100%\"><tr><td><tt>\n");
    
    bytes = mail_format_get_data_wrapper_text (CAMEL_DATA_WRAPPER (mime_message), md);
    if (bytes) {
        g_byte_array_append (bytes, "", 1);
        html_str = e_text_to_html (bytes->data, E_TEXT_TO_HTML_CONVERT_NL |
                       E_TEXT_TO_HTML_CONVERT_SPACES | E_TEXT_TO_HTML_ESCAPE_8BIT);
        g_byte_array_free (bytes, TRUE);
        
        mail_html_write (html, stream, html_str);
        g_free (html_str);
    }
    
    mail_html_write (html, stream, "</tt></td></tr></table>");
}

static const char *
get_cid (CamelMimePart *part, MailDisplay *md)
{
    static int fake_cid_counter = 0;
    char *cid;
    
    /* If we have a real Content-ID, use it. If we don't,
     * make a (syntactically invalid, unique) fake one.
     */
    if (camel_mime_part_get_content_id (part)) {
        cid = g_strdup_printf ("cid:%s",
                       camel_mime_part_get_content_id (part));
    } else
        cid = g_strdup_printf ("cid:@@@%d", fake_cid_counter++);
    
    return mail_display_add_url (md, "part_urls", cid, part);
}

static const char *
get_location (CamelMimePart *part, MailDisplay *md)
{
    CamelURL *base;
    const char *loc;
    char *location;
    
    base = mail_display_get_content_location (md);
    
    loc = camel_mime_part_get_content_location (part);
    if (!loc) {
        if (!base)
            return NULL;
        
        location = camel_url_to_string (base, 0);
        return mail_display_add_url (md, "part_urls", location, part);
    }
    
    /* kludge: If the multipart/related does not have a
           Content-Location header and the HTML part doesn't contain a
           Content-Location header either, then we will end up
           generating a invalid unique identifier in the form of
           "cid:@@@%d" for use in GtkHTML's iframe src url. This means
           that when GtkHTML requests a relative URL, it will request
           "cid:/%s" */
    mail_display_add_url (md, "part_urls", g_strdup_printf ("cid:/%s", loc), part);
    
    if (!strchr (loc, ':') && base) {
        CamelURL *url;
        
        mail_display_add_url (md, "part_urls", g_strdup (loc), part);
        
        url = camel_url_new_with_base (base, loc);
        location = camel_url_to_string (url, 0);
        camel_url_free (url);
    } else {
        location = g_strdup (loc);
    }
    
    return mail_display_add_url (md, "part_urls", location, part);
}


static GHashTable *mime_handler_table, *mime_function_table;

static void
setup_mime_tables (void)
{
    mime_handler_table = g_hash_table_new (g_str_hash, g_str_equal);
    mime_function_table = g_hash_table_new (g_str_hash, g_str_equal);
    
    g_hash_table_insert (mime_function_table, "text/plain",
                 handle_text_plain);
    g_hash_table_insert (mime_function_table, "text/richtext",
                 handle_text_enriched);
    g_hash_table_insert (mime_function_table, "text/enriched",
                 handle_text_enriched);
    g_hash_table_insert (mime_function_table, "text/html",
                 handle_text_html);
    
    g_hash_table_insert (mime_function_table, "image/gif",
                 handle_image);
    g_hash_table_insert (mime_function_table, "image/jpeg",
                 handle_image);
    g_hash_table_insert (mime_function_table, "image/png",
                 handle_image);
    g_hash_table_insert (mime_function_table, "image/x-png",
                 handle_image);
    g_hash_table_insert (mime_function_table, "image/tiff",
                 handle_image);
    g_hash_table_insert (mime_function_table, "image/x-bmp",
                 handle_image);
    g_hash_table_insert (mime_function_table, "image/bmp",
                 handle_image);
    g_hash_table_insert (mime_function_table, "image/x-cmu-raster",
                 handle_image);
    g_hash_table_insert (mime_function_table, "image/x-ico",
                 handle_image);
    g_hash_table_insert (mime_function_table, "image/x-portable-anymap",
                 handle_image);
    g_hash_table_insert (mime_function_table, "image/x-portable-bitmap",
                 handle_image);
    g_hash_table_insert (mime_function_table, "image/x-portable-graymap",
                 handle_image);
    g_hash_table_insert (mime_function_table, "image/x-portable-pixmap",
                 handle_image);
    g_hash_table_insert (mime_function_table, "image/x-xpixmap",
                 handle_image);
    
    g_hash_table_insert (mime_function_table, "message/rfc822",
                 handle_message_rfc822);
    g_hash_table_insert (mime_function_table, "message/news",
                 handle_message_rfc822);
    g_hash_table_insert (mime_function_table, "message/external-body",
                 handle_message_external_body);
    
    g_hash_table_insert (mime_function_table, "multipart/alternative",
                 handle_multipart_alternative);
    g_hash_table_insert (mime_function_table, "multipart/related",
                 handle_multipart_related);
    g_hash_table_insert (mime_function_table, "multipart/mixed",
                 handle_multipart_mixed);
    g_hash_table_insert (mime_function_table, "multipart/appledouble",
                 handle_multipart_appledouble);
    g_hash_table_insert (mime_function_table, "multipart/encrypted",
                 handle_multipart_encrypted);
    g_hash_table_insert (mime_function_table, "multipart/signed",
                 handle_multipart_signed);
    g_hash_table_insert (mime_function_table, "multipart/digest",
                 handle_multipart_digest);
    
    /* RFC 2046 says unrecognized text subtypes can be treated
     * as text/plain (as long as you recognize the character set),
     * and unrecognized multipart subtypes as multipart/mixed.  */
    g_hash_table_insert (mime_function_table, "text/*",
                 handle_text_plain);
    g_hash_table_insert (mime_function_table, "multipart/*",
                 handle_multipart_mixed);
}

static gboolean
component_supports (OAF_ServerInfo *component, const char *mime_type)
{
    OAF_Property *prop;
    CORBA_sequence_CORBA_string stringv;
    int i;

    prop = oaf_server_info_prop_find (component,
                      "bonobo:supported_mime_types");
    if (!prop || prop->v._d != OAF_P_STRINGV)
        return FALSE;

    stringv = prop->v._u.value_stringv;
    for (i = 0; i < stringv._length; i++) {
        if (!g_strcasecmp (mime_type, stringv._buffer[i]))
            return TRUE;
    }
    return FALSE;
}

/**
 * mail_lookup_handler:
 * @mime_type: a MIME type
 *
 * Looks up the MIME type in its own tables and GNOME-VFS's and returns
 * a MailMimeHandler structure detailing the component, application,
 * and built-in handlers (if any) for that MIME type. (If the component
 * is non-%NULL, the built-in handler will always be handle_via_bonobo().)
 * The MailMimeHandler's @generic field is set if the match was for the
 * MIME supertype rather than the exact type.
 *
 * Return value: a MailMimeHandler (which should not be freed), or %NULL
 * if no handlers are available.
 **/
MailMimeHandler *
mail_lookup_handler (const char *mime_type)
{
    MailMimeHandler *handler;
    char *mime_type_main;
    const char *p;
    
    if (mime_handler_table == NULL)
        setup_mime_tables ();

    /* See if we've already found it. */
    handler = g_hash_table_lookup (mime_handler_table, mime_type);
    if (handler)
        return handler;

    /* No. Create a new one and look up application and full type
     * handler. If we find a builtin, create the handler and
     * register it.
     */
    handler = g_new0 (MailMimeHandler, 1);
    handler->applications =
        gnome_vfs_mime_get_short_list_applications (mime_type);
    handler->builtin =
        g_hash_table_lookup (mime_function_table, mime_type);

    if (handler->builtin) {
        handler->generic = FALSE;
        goto reg;
    }

    /* Try for a exact component match. */
    handler->component = gnome_vfs_mime_get_default_component (mime_type);
    if (handler->component &&
        component_supports (handler->component, mime_type)) {
        handler->generic = FALSE;
        handler->builtin = handle_via_bonobo;
        goto reg;
    }
    
    /* Try for a generic builtin match. */
    p = strchr (mime_type, '/');
    if (p == NULL)
        p = mime_type + strlen (mime_type);
    mime_type_main = alloca ((p - mime_type) + 3);
    memcpy (mime_type_main, mime_type, p - mime_type);
    memcpy (mime_type_main + (p - mime_type), "/*", 3);
    
    handler->builtin = g_hash_table_lookup (mime_function_table,
                        mime_type_main);
    
    if (handler->builtin) {
        handler->generic = TRUE;
        if (handler->component) {
            CORBA_free (handler->component);
            handler->component = NULL;
        }
        goto reg;
    }

    /* Try for a generic component match. */
    if (handler->component) {
        handler->generic = TRUE;
        handler->builtin = handle_via_bonobo;
        goto reg;
    }

    /* If we at least got an application, use that. */
    if (handler->applications) {
        handler->generic = TRUE;
        goto reg;
    }

    /* Nada. */
    g_free (handler);
    return NULL;

 reg:
    g_hash_table_insert (mime_handler_table, g_strdup (mime_type),
                 handler);
    return handler;
}

/* An "anonymous" MIME part is one that we shouldn't call attention
 * to the existence of, but simply display.
 */
static gboolean
is_anonymous (CamelMimePart *part, const char *mime_type)
{
    if (!g_strncasecmp (mime_type, "multipart/", 10) ||
        !g_strncasecmp (mime_type, "message/", 8))
        return TRUE;
    
    if (!g_strncasecmp (mime_type, "text/", 5) &&
        !camel_mime_part_get_filename (part))
        return TRUE;
    
    return FALSE;
}

/**
 * mail_part_is_inline:
 * @part: a CamelMimePart
 *
 * Return value: whether or not the part should/will be displayed inline.
 **/
gboolean
mail_part_is_inline (CamelMimePart *part)
{
    const char *disposition;
    CamelContentType *content_type;
    char *type;
    gboolean anon;
    
    /* If it has an explicit disposition, return that. */
    disposition = camel_mime_part_get_disposition (part);
    if (disposition)
        return g_strcasecmp (disposition, "inline") == 0;
    
    /* Certain types should default to inline. FIXME: this should
     * be customizable.
     */
    content_type = camel_mime_part_get_content_type (part);
    if (!header_content_type_is (content_type, "message", "*"))
        return TRUE;
    
    /* Otherwise, display it inline if it's "anonymous", and
     * as an attachment otherwise.
     */
    type = header_content_type_simple (content_type);
    anon = is_anonymous (part, type);
    g_free (type);
    
    return anon;
}

enum inline_states {
    I_VALID     = (1 << 0),
    I_ACTUALLY  = (1 << 1),
    I_DISPLAYED = (1 << 2)
};

static gint
get_inline_flags (CamelMimePart *part, MailDisplay *md)
{
    GHashTable *asht;
    gint val;

    /* check if we already know. */

    asht = g_datalist_get_data (md->data, "attachment_states");
    val = GPOINTER_TO_INT (g_hash_table_lookup (asht, part));
    if (val)
        return val;

    /* ok, we don't know. Figure it out. */

    if (mail_part_is_inline (part))
        val = (I_VALID | I_ACTUALLY | I_DISPLAYED);
    else
        val = (I_VALID);

    g_hash_table_insert (asht, part, GINT_TO_POINTER (val));

    return val;
}

gboolean
mail_part_is_displayed_inline (CamelMimePart *part, MailDisplay *md)
{
    return (gboolean) (get_inline_flags (part, md) & I_DISPLAYED);
}

void
mail_part_toggle_displayed (CamelMimePart *part, MailDisplay *md)
{
    GHashTable *asht = g_datalist_get_data (md->data, "attachment_states");
    gpointer ostate, opart;
    gint state;
    
    if (g_hash_table_lookup_extended (asht, part, &opart, &ostate)) {
        g_hash_table_remove (asht, part);
        
        state = GPOINTER_TO_INT (ostate);
        
        if (state & I_DISPLAYED)
            state &= ~I_DISPLAYED;
        else
            state |= I_DISPLAYED;
    } else {
        state = I_VALID | I_DISPLAYED;
    }
    
    g_hash_table_insert (asht, part, GINT_TO_POINTER (state));
}

static void
mail_part_set_default_displayed_inline (CamelMimePart *part, MailDisplay *md,
                    gboolean displayed)
{
    GHashTable *asht = g_datalist_get_data (md->data, "attachment_states");
    gint state;
    
    if (g_hash_table_lookup (asht, part))
        return;

    state = I_VALID | (displayed ? I_DISPLAYED : 0);
    g_hash_table_insert (asht, part, GINT_TO_POINTER (state));
}

static void
attachment_header (CamelMimePart *part, const char *mime_type, MailDisplay *md,
           GtkHTML *html, GtkHTMLStream *stream)
{
    char *htmlinfo, *html_str, *fmt;
    const char *info;
    
    /* Start the table, create the pop-up object. */
    mail_html_write (html, stream, 
             "<table cellspacing=0 cellpadding=0>"
             "<tr><td><table width=10 cellspacing=0 cellpadding=0><tr><td></td></tr></table></td>");

    if (! md->printing) {
        gtk_html_stream_printf (stream, "<td><object classid=\"popup:%s\" type=\"%s\"></object></td>",
                    get_cid (part, md), mime_type);
    }
    
    mail_html_write (html, stream,
             "<td><table width=3 cellspacing=0 cellpadding=0><tr><td></td></tr></table></td>"
             "<td><font size=-1>");

    
    /* Write the MIME type */
    info = gnome_vfs_mime_get_value (mime_type, "description");
    html_str = e_text_to_html (info ? info : mime_type, 0);
    htmlinfo = e_utf8_from_locale_string (html_str);
    g_free (html_str);
    fmt = e_utf8_from_locale_string (_("%s attachment"));
    gtk_html_stream_printf (stream, fmt, htmlinfo);
    g_free (htmlinfo);
    g_free (fmt);
        
    /* Write the name, if we have it. */
    info = camel_mime_part_get_filename (part);
    if (info) {
        htmlinfo = e_text_to_html (info, 0);
        gtk_html_stream_printf (stream, " (%s)", htmlinfo);
        g_free (htmlinfo);
    }
    
    /* Write a description, if we have one. */
    info = camel_mime_part_get_description (part);
    if (info) {
        htmlinfo = e_text_to_html (info, md->printing ? 0 : E_TEXT_TO_HTML_CONVERT_URLS);
        gtk_html_stream_printf (stream, ", \"%s\"", htmlinfo);
        g_free (htmlinfo);
    }
    
    mail_html_write (html, stream, "</font></td></tr><tr>"
             "<td height=10><table height=10 cellspacing=0 cellpadding=0>"
             "<tr><td></td></tr></table></td></tr></table>\n");
}

static gboolean
format_mime_part (CamelMimePart *part, MailDisplay *md,
          GtkHTML *html, GtkHTMLStream *stream)
{
    CamelDataWrapper *wrapper;
    char *mime_type;
    MailMimeHandler *handler;
    gboolean output;
    int inline_flags;
    
    /* Record URLs associated with this part */
    get_cid (part, md);
    get_location (part, md);
    
    wrapper = camel_medium_get_content_object (CAMEL_MEDIUM (part));
    
    if (CAMEL_IS_MULTIPART (wrapper) &&
        camel_multipart_get_number (CAMEL_MULTIPART (wrapper)) == 0) {
        char *mesg;
        
        mesg = e_utf8_from_locale_string (_("Could not parse MIME message. Displaying as source."));
        mail_error_printf (html, stream, "\n%s\n", mesg);
        g_free (mesg);
        if (mail_content_loaded (wrapper, md, TRUE, NULL, html, NULL))
            handle_text_plain (part, "text/plain", md, html, stream);
        return TRUE;
    }
    
    mime_type = camel_data_wrapper_get_mime_type (wrapper);
    g_strdown (mime_type);
    
    handler = mail_lookup_handler (mime_type);
    if (!handler) {
        char *id_type;
        
        /* Special case MIME types that we know that we can't
         * display but are some kind of plain text to prevent
         * evil infinite recursion.
         */
        
        if (!strcmp (mime_type, "application/mac-binhex40")) {
            handler = NULL;
        } else {
            id_type = mail_identify_mime_part (part, md);
            if (id_type) {
                g_free (mime_type);
                mime_type = id_type;
                handler = mail_lookup_handler (id_type);
            }
        }
    }
    
    inline_flags = get_inline_flags (part, md);
    
    /* No header for anonymous inline parts. */
    if (!((inline_flags & I_ACTUALLY) && is_anonymous (part, mime_type)))
        attachment_header (part, mime_type, md, html, stream);
    
    if (handler && handler->builtin && inline_flags & I_DISPLAYED &&
        mail_content_loaded (wrapper, md, TRUE, NULL, html, NULL))
        output = (*handler->builtin) (part, mime_type, md, html, stream);
    else
        output = TRUE;
    
    g_free (mime_type);
    return output;
}

/* flags for write_field_to_stream */
enum {
    WRITE_BOLD=1,
    WRITE_NOCOLUMNS=2,
};

static void
write_field_row_begin (const char *name, gint flags, GtkHTML *html, GtkHTMLStream *stream)
{
    char *encoded_name;
    gboolean bold = (flags & WRITE_BOLD);
    gboolean nocolumns = (flags & WRITE_NOCOLUMNS);
    
    encoded_name = e_utf8_from_gtk_string (GTK_WIDGET (html), name);
    
    if (nocolumns) {
        gtk_html_stream_printf (stream, "<tr><td>%s%s:%s ",
                    bold ? "<b>" : "", encoded_name,
                    bold ? "</b>" : "");
    } else {
        gtk_html_stream_printf (stream, "<tr><%s align=\"right\" valign=\"top\">%s:"
                    "<b>&nbsp;</%s><td>", bold ? "th" : "td",
                    encoded_name, bold ? "th" : "td");
    }
    
    g_free (encoded_name);
}

static void
write_date (CamelMimeMessage *message, int flags, GtkHTML *html, GtkHTMLStream *stream)
{
    char *datestr;
    time_t date;
    int offset;
    
    write_field_row_begin (_("Date"), flags, html, stream);
    
    date = camel_mime_message_get_date (message, &offset);
    datestr = header_format_date (date, offset);
    
    gtk_html_stream_printf (stream, "%s</td> </tr>", datestr);
    
    g_free (datestr);
}

static void
write_text_header (const char *name, const char *value, int flags, GtkHTML *html, GtkHTMLStream *stream)
{
    char *encoded;

    if (value && *value)
        encoded = e_text_to_html (value, E_TEXT_TO_HTML_CONVERT_NL | E_TEXT_TO_HTML_CONVERT_URLS);
    else
        encoded = "";
    
    write_field_row_begin (name, flags, html, stream);
    
    gtk_html_stream_printf (stream, "%s</td> </tr>", encoded);
    
    if (value && *value)
        g_free (encoded);
}

static void
write_address (MailDisplay *md, GtkHTML *html, GtkHTMLStream *stream,
           const CamelInternetAddress *addr, const char *field_name, int flags)
{
    const char *name, *email;
    gint i;
    
    if (addr == NULL || !camel_internet_address_get (addr, 0, NULL, NULL))
        return;
    
    write_field_row_begin (field_name, flags, html, stream);
    
    i = 0;
    while (camel_internet_address_get (addr, i, &name, &email)) {
        CamelInternetAddress *subaddr;
        gchar *addr_txt, *addr_url;
        gboolean have_name = name && *name;
        gboolean have_email = email && *email;
        gchar *name_disp = NULL;
        gchar *email_disp = NULL;

        subaddr = camel_internet_address_new ();
        camel_internet_address_add (subaddr, name, email);
        addr_txt = camel_address_format (CAMEL_ADDRESS (subaddr));
        addr_url = camel_url_encode (addr_txt, TRUE, NULL);
        camel_object_unref (CAMEL_OBJECT (subaddr));
        
        if (have_name) {
            name_disp = e_text_to_html (name, 0);
        }
        
        if (have_email) {
            email_disp = e_text_to_html (email, 0);
        }
        
        if (i)
            mail_html_write (html, stream, ", ");
        
        if (have_email || have_name) {
            if (!have_email) {
                email_disp = g_strdup ("???");
            }
            
            if (have_name) {
                if (md->printing) {
                    gtk_html_stream_printf (stream, "%s &lt;%s&gt;", name_disp, email_disp);
                } else {
                    gtk_html_stream_printf (stream,
                                "%s &lt;<a href=\"mailto:%s\">%s</a>&gt;",
                                name_disp, addr_url, email_disp);
                }
            } else {
                if (md->printing) {
                    mail_html_write (html, stream, email_disp);
                } else {
                    gtk_html_stream_printf (stream,
                                "<a href=\"mailto:%s\">%s</a>",
                                addr_url, email_disp);
                }
            }           

        } else {
            char *str;
            
            str = e_utf8_from_locale_string (_("Bad Address"));
            gtk_html_stream_printf (stream, "<i>%s</i>", str);
            g_free (str);
        }

        g_free (name_disp);
        g_free (email_disp);
        g_free (addr_txt);
        g_free (addr_url);
        
        i++;
    }
    
    mail_html_write (html, stream, "</td></tr>");
}

/* order of these must match write_header code */
static char *default_headers[] = {
    "From", "Reply-To", "To", "Cc", "Bcc", "Subject", "Date",
};

/* return index of header in default_headers array */
static int
default_header_index(const char *name)
{
    int i;

    for (i=0;i<sizeof(default_headers)/sizeof(default_headers[0]);i++)
        if (!g_strcasecmp(name, default_headers[i]))
            return i;
    
    return -1;
}

/* index is index of header in default_headers array */
static void
write_default_header(CamelMimeMessage *message, MailDisplay *md, 
             GtkHTML *html, GtkHTMLStream *stream,
             int index, int flags)
{
    switch(index) {
    case 0:
        write_address (md, html, stream,
                   camel_mime_message_get_from (message), _("From"), flags | WRITE_BOLD);
        break;
    case 1:
        write_address (md, html, stream, 
                   camel_mime_message_get_reply_to (message), _("Reply-To"), flags | WRITE_BOLD);
        break;
    case 2:
        write_address(md, html, stream,
                  camel_mime_message_get_recipients(message, CAMEL_RECIPIENT_TYPE_TO),
                  _("To"), flags | WRITE_BOLD);
        break;
    case 3:
        write_address (md, html, stream,
                   camel_mime_message_get_recipients (message, CAMEL_RECIPIENT_TYPE_CC),
                   _("Cc"), flags | WRITE_BOLD);
        break;
    case 4:
        write_address (md, html, stream,
                   camel_mime_message_get_recipients (message, CAMEL_RECIPIENT_TYPE_BCC),
                   _("Bcc"), flags | WRITE_BOLD);
        break;
    case 5:
        write_text_header (_("Subject"), camel_mime_message_get_subject (message),
                   flags | WRITE_BOLD, html, stream);
        break;
    case 6:
        write_date (message, flags | WRITE_BOLD, html, stream);
        break;
    default:
        g_assert_not_reached();
    }
}

static gboolean
write_xmailer_header (CamelMimeMessage *message, MailDisplay *md,
              GtkHTML *html, GtkHTMLStream *stream,
              MailConfigXMailerDisplayStyle xm)
{
    const char *xmailer, *evolution;

    xmailer = camel_medium_get_header (CAMEL_MEDIUM (message), "X-Mailer");
    if (!xmailer) {
        xmailer = camel_medium_get_header (CAMEL_MEDIUM (message), "User-Agent");
        if (!xmailer)
            return FALSE;
    }

    evolution = strstr (xmailer, "Evolution");
    if ((xm & MAIL_CONFIG_XMAILER_OTHER) ||
        (evolution && (xm & MAIL_CONFIG_XMAILER_EVO)))
        write_text_header (_("Mailer"), xmailer, WRITE_BOLD, html, stream);

    return evolution != NULL && (xm & MAIL_CONFIG_XMAILER_RUPERT_APPROVED);
}

#define COLOR_IS_LIGHT(r, g, b)  ((r + g + b) > (128 * 3))

static void
write_headers (CamelMimeMessage *message, MailDisplay *md,
           GtkHTML *html, GtkHTMLStream *stream)
{
    MailConfigXMailerDisplayStyle xm = mail_config_get_x_mailer_display_style ();
    gboolean full = (md->display_style == MAIL_CONFIG_DISPLAY_FULL_HEADERS);
    char bgcolor[7], fontcolor[7];
    GtkStyle *style = NULL;
    gboolean evo_icon = FALSE;
    int i;

    /* My favorite thing to do... muck around with colors so we respect people's stupid themes.
       However, we only do this if we are rendering to the screen -- we ignore the theme
       when we are printing. */
    style = gtk_widget_get_style (GTK_WIDGET (html));
    if (style && !md->printing) {
        int state = GTK_WIDGET_STATE (GTK_WIDGET (html));
        gushort r, g, b;
        
        r = style->base[state].red / 256;
        g = style->base[state].green / 256;
        b = style->base[state].blue / 256;
        
        if (COLOR_IS_LIGHT (r, g, b)) {
            r *= 0.92;
            g *= 0.92;
            b *= 0.92;
        } else {
            r = 255 - (0.92 * (255 - r));
            g = 255 - (0.92 * (255 - g));
            b = 255 - (0.92 * (255 - b));
        }
        
        sprintf (bgcolor, "%.2X%.2X%.2X", r, g, b);
        
        r = style->text[state].red / 256;
        g = style->text[state].green / 256;
        b = style->text[state].blue / 256;
        
        sprintf (fontcolor, "%.2X%.2X%.2X", r, g, b);
    } else {
        strcpy (bgcolor, "EEEEEE");
        strcpy (fontcolor, "000000");
    }
    
    gtk_html_stream_printf (
        stream,
        "<table width=\"100%%\" cellpadding=0 cellspacing=0>"
        /* Top margin */
        "<tr><td colspan=3 height=10><table height=10 cellpadding=0 cellspacing=0><tr><td></td></tr></table></td></tr>"
        /* Left margin */
        "<tr><td><table width=10 cellpadding=0 cellspacing=0><tr><td></td></tr></table></td>"
        /* Black border */
        "<td width=\"100%%\"><table bgcolor=\"#000000\" width=\"100%%\" cellspacing=0 cellpadding=1>"
        /* Main header box */
        "<tr><td><table bgcolor=\"#%s\" width=\"100%%\" cellpadding=0 cellspacing=0>"
        /* Internal header table */
        "<tr valign=top><td><table><font color=\"#%s\">\n",
        bgcolor, fontcolor);
    
    if (full) {
        struct _header_raw *header;
        const char *charset;
        CamelContentType *ct;
        char *value;
        
        ct = camel_mime_part_get_content_type(CAMEL_MIME_PART(message));
        charset = header_content_type_param(ct, "charset");
        charset = e_iconv_charset_name(charset);
        
        header = CAMEL_MIME_PART(message)->headers;
        while (header) {
            i = default_header_index(header->name);
            if (i == -1) {
                value = header_decode_string(header->value, charset);
                write_text_header(header->name, value, WRITE_NOCOLUMNS, html, stream);
                g_free(value);
            } else
                write_default_header(message, md, html, stream, i, WRITE_NOCOLUMNS);
            header = header->next;
        }
    } else {
        for (i=0;i<sizeof(default_headers)/sizeof(default_headers[0]);i++)
            write_default_header(message, md, html, stream, i, 0);
        if (xm != MAIL_CONFIG_XMAILER_NONE)
            evo_icon = write_xmailer_header(message, md, html, stream, xm);
    }
    
    /* Close off the internal header table */
    mail_html_write (html, stream, "</font></table></td>");

    if (!md->printing && evo_icon) {
        gtk_html_stream_printf (stream,
                    "<td align=right><table><tr><td width=16>"
                    "<img src=\"%s\">"
                    "</td></tr></table></td>",
                    mail_display_get_url_for_icon (md, EVOLUTION_ICONSDIR "/monkey-16.png"));
    }

    mail_html_write (html, stream,
             /* Main header box */
             "</tr></table>"
             /* Black border */
             "</td></tr></table></td>"
             /* Right margin */
             "<td><table width=10 cellpadding=0 cellspacing=0><tr><td></td></tr></table></td>"
             "</tr></table>\n");
}

static void
load_offline_content (MailDisplay *md, gpointer data)
{
    CamelDataWrapper *wrapper = data;
    CamelStream *stream;
    
    stream = camel_stream_null_new ();
    camel_data_wrapper_write_to_stream (wrapper, stream);
    camel_object_unref (CAMEL_OBJECT (stream));
    camel_object_unref (CAMEL_OBJECT (wrapper));
}

gboolean
mail_content_loaded (CamelDataWrapper *wrapper, MailDisplay *md, gboolean redisplay, const gchar *url,
             GtkHTML *html, GtkHTMLStream *handle)
{
    if (!camel_data_wrapper_is_offline (wrapper))
        return TRUE;
    
    camel_object_ref (CAMEL_OBJECT (wrapper));
    if (redisplay)
        mail_display_redisplay_when_loaded (md, wrapper, load_offline_content, html, wrapper);
    else
        mail_display_stream_write_when_loaded (md, wrapper, url, load_offline_content, html, handle, wrapper);
    
    return FALSE;
}

/* Return the contents of a data wrapper, or %NULL if it contains only
 * whitespace.
 */
GByteArray *
mail_format_get_data_wrapper_text (CamelDataWrapper *wrapper, MailDisplay *mail_display)
{
    CamelStream *memstream;
    CamelStreamFilter *filtered_stream;
    GByteArray *ba;
    char *text, *end;
    
    memstream = camel_stream_mem_new ();
    ba = g_byte_array_new ();
    camel_stream_mem_set_byte_array (CAMEL_STREAM_MEM (memstream), ba);
    
    filtered_stream = camel_stream_filter_new_with_stream (memstream);
    camel_object_unref (CAMEL_OBJECT (memstream));
    
    if (wrapper->rawtext || (mail_display && mail_display->charset)) {
        CamelMimeFilterCharset *filter;
        const char *charset;
        
        if (!wrapper->rawtext) {
            /* data wrapper had been successfully converted to UTF-8 using the mime
               part's charset, but the user thinks he knows best so we'll let him
               shoot himself in the foot here... */
            CamelContentType *content_type;
            
            /* get the original charset of the mime part */
            content_type = camel_data_wrapper_get_mime_type_field (wrapper);
            charset = content_type ? header_content_type_param (content_type, "charset") : NULL;
            if (!charset)
                charset = mail_config_get_default_charset ();
            
            /* since the content is already in UTF-8, we need to decode into the
               original charset before we can convert back to UTF-8 using the charset
               the user is overriding with... */
            filter = camel_mime_filter_charset_new_convert ("utf-8", charset);
            if (filter) {
                camel_stream_filter_add (filtered_stream, CAMEL_MIME_FILTER (filter));
                camel_object_unref (CAMEL_OBJECT (filter));
            }
        }
        
        /* find out the charset the user wants to override to */
        if (mail_display && mail_display->charset)
            charset = mail_display->charset;
        else
            charset = mail_config_get_default_charset ();
        
        filter = camel_mime_filter_charset_new_convert (charset, "utf-8");
        if (filter) {
            camel_stream_filter_add (filtered_stream, CAMEL_MIME_FILTER (filter));
            camel_object_unref (CAMEL_OBJECT (filter));
        }
    }
    
    camel_data_wrapper_write_to_stream (wrapper, CAMEL_STREAM (filtered_stream));
    camel_stream_flush (CAMEL_STREAM (filtered_stream));
    camel_object_unref (CAMEL_OBJECT (filtered_stream));
    
    for (text = ba->data, end = text + ba->len; text < end; text++) {
        if (!isspace ((unsigned char)*text))
            break;
    }
    
    if (text >= end) {
        g_byte_array_free (ba, TRUE);
        return NULL;
    }
    
    return ba;
}

static void
write_hr (GtkHTML *html, GtkHTMLStream *stream)
{
    mail_html_write (html, stream,
             "<table cellspacing=0 cellpadding=10 width=\"100%\"><tr><td width=\"100%\">"
             "<hr noshadow size=1></td></tr></table>\n");
}

/*----------------------------------------------------------------------*
 *                     Mime handling functions
 *----------------------------------------------------------------------*/

struct {
    char *start;
    char * (*handler) (char *start, CamelMimePart *part,
               guint offset, MailDisplay *md, GtkHTML *html, GtkHTMLStream *stream);
} text_specials[] = {
    { "-----BEGIN PGP MESSAGE-----\n", try_inline_pgp },
    { "-----BEGIN PGP SIGNED MESSAGE-----\n", try_inline_pgp_sig },
    { "begin ", try_uudecoding },
    { "(This file must be converted with BinHex 4.0)\n", try_inline_binhex }
};

static int num_specials = (sizeof (text_specials) / sizeof (text_specials[0]));

static void
write_one_text_plain_chunk (const char *text, int len, GtkHTML *html, GtkHTMLStream *stream, gboolean printing)
{
    char *buf;
    
    mail_html_write (html, stream,
             "<table cellspacing=0 cellpadding=10 width=\"100%\"><tr><td>\n");
    
    buf = g_strndup (text, len);
    mail_text_write  (html, stream, printing, buf);
    g_free (buf);
    
    mail_html_write (html, stream, "</td></tr></table>\n");
}

static gboolean
handle_text_plain (CamelMimePart *part, const char *mime_type,
           MailDisplay *md, GtkHTML *html, GtkHTMLStream *stream)
{
    CamelDataWrapper *wrapper =
        camel_medium_get_content_object (CAMEL_MEDIUM (part));
    CamelContentType *type;
    gboolean check_specials;
    char *p, *start, *text;
    const char *format;
    GByteArray *bytes;
    int i;
    
    bytes = mail_format_get_data_wrapper_text (wrapper, md);
    if (!bytes)
        return FALSE;
    
    g_byte_array_append (bytes, "", 1);
    text = bytes->data;
    g_byte_array_free (bytes, FALSE);
    
    /* Check to see if this is a broken text/html part with content-type text/plain */
    start = text;
    while (isspace ((unsigned) *start))
        start++;
    if (!g_strncasecmp (start, "<html>", 6) || !g_strncasecmp (start, "<!DOCTYPE HTML", 14)) {
        g_free (text);
        return handle_text_html (part, "text/html", md, html, stream);
    }
    
    /* Check for RFC 2646 flowed text. */
    type = camel_mime_part_get_content_type (part);
    format = header_content_type_param (type, "format");
    if (format && !g_strcasecmp (format, "flowed"))
        return handle_text_plain_flowed (text, md, html, stream);
    
    /* Only look for binhex and stuff if this is real text/plain.
     * (and not, say, application/mac-binhex40 that mail-identify
     * has decided to call text/plain because it starts with English
     * text...)
     */
    check_specials = !g_strcasecmp (mime_type, "text/plain");
    
    p = text;
    while (p && check_specials) {
        /* Look for special cases. */
        for (i = 0; i < num_specials; i++) {
            start = strstr (p, text_specials[i].start);
            if (start && (start == p || start[-1] == '\n'))
                break;
        }
        if (i == num_specials)
            break;
        
        /* Deal with special case */
        if (start != p)
            write_one_text_plain_chunk (p, start - p, html, stream, md->printing);
        
        p = text_specials[i].handler (start, part, start - text, md, html, stream);
        if (p == start) {
            /* Oops. That failed. Output this line normally and
             * skip over it.
             */
            p = strchr (start, '\n');
            /* Last line, drop out, and dump */
            if (p == NULL) {
                p = start;
                break;
            }
            p++;
            write_one_text_plain_chunk (start, p - start, html, stream, md->printing);
        } else if (p)
            write_hr (html, stream);
    }
    /* Finish up (or do the whole thing if there were no specials). */
    if (p)
        write_one_text_plain_chunk (p, strlen (p), html, stream, md->printing);
    
    g_free (text);
    
    return TRUE;
}

static gboolean
handle_text_plain_flowed (char *buf, MailDisplay *md, GtkHTML *html, GtkHTMLStream *stream)
{
    char *text, *line, *eol, *p;
    int prevquoting = 0, quoting, len, br_pending = 0;
    guint32 citation_color = mail_config_get_citation_color ();
    
    mail_html_write (html, stream,
             "\n<!-- text/plain, flowed -->\n"
             "<table cellspacing=0 cellpadding=10 width=\"100%\"><tr><td>\n<tt>\n");
    
    for (line = buf; *line; line = eol + 1) {
        /* Process next line */
        eol = strchr (line, '\n');
        if (eol)
            *eol = '\0';
        
        quoting = 0;
        for (p = line; *p == '>'; p++)
            quoting++;
        if (quoting != prevquoting) {
            if (prevquoting == 0) {
                if (md->printing)
                    mail_html_write (html, stream, "<i>");
                else
                    gtk_html_stream_printf (stream, "<font color=\"#%06x\">", citation_color);
                if (br_pending)
                    br_pending--;
            }
            while (quoting > prevquoting) {
                mail_html_write (html, stream, "<blockquote type=\"cite\">");
                prevquoting++;
            }
            while (quoting < prevquoting) {
                mail_html_write (html, stream, "</blockquote>");
                prevquoting--;
            }
            if (quoting == 0) {
                mail_html_write (html, stream, md->printing ? "</i>" : "</font>\n");
                if (br_pending)
                    br_pending--;
            }
        }
        
        if (*p == ' ')
            p++;
        len = strlen (p);
        if (len == 0) {
            br_pending++;
            continue;
        }
        
        while (br_pending) {
            mail_html_write (html, stream, "<br>\n");
            br_pending--;
        }
        
        /* replace '<' with '&lt;', etc. */
        text = e_text_to_html (p, 
                       md->printing ?
                       E_TEXT_TO_HTML_CONVERT_SPACES :
                       E_TEXT_TO_HTML_CONVERT_SPACES | E_TEXT_TO_HTML_CONVERT_URLS);
        if (text && *text)
            mail_html_write (html, stream, text);
        g_free (text);
        
        if ((len > 0 && p[len - 1]) != ' ' || !strcmp (p, "-- "))
            br_pending++;
        
        if (!eol)
            break;
    }
    
    g_free (buf);
    
    mail_html_write (html, stream, "</tt>\n</td></tr></table>\n");
    
    return TRUE;
}

static CamelMimePart *
fake_mime_part_from_data (const char *data, int len, const char *type,
              guint offset, MailDisplay *md)
{
    GHashTable *fake_parts = g_datalist_get_data (md->data, "fake_parts");
    CamelStream *memstream;
    CamelDataWrapper *wrapper;
    CamelMimePart *part;

    part = g_hash_table_lookup (fake_parts, GUINT_TO_POINTER (offset));
    if (part)
        return part;

    memstream = camel_stream_mem_new_with_buffer (data, len);
    wrapper = camel_data_wrapper_new ();
    camel_data_wrapper_construct_from_stream (wrapper, memstream);
    camel_data_wrapper_set_mime_type (wrapper, type);
    camel_object_unref (CAMEL_OBJECT (memstream));
    part = camel_mime_part_new ();
    camel_medium_set_content_object (CAMEL_MEDIUM (part), wrapper);
    camel_object_unref (CAMEL_OBJECT (wrapper));
    camel_mime_part_set_disposition (part, "inline");

    g_hash_table_insert (fake_parts, GUINT_TO_POINTER (offset), part);
    return part;
}

static void
destroy_part (CamelObject *root, gpointer event_data, gpointer user_data)
{
    camel_object_unref (user_data);
}

static char *
try_inline_pgp (char *start, CamelMimePart *mime_part,
        guint offset, MailDisplay *md, GtkHTML *html, GtkHTMLStream *stream)
{
    return start;
}

static char *
try_inline_pgp_sig (char *start, CamelMimePart *mime_part,
            guint offset, MailDisplay *md, GtkHTML *html, GtkHTMLStream *stream)
{
    return start;
}

static char *
try_uudecoding (char *start, CamelMimePart *mime_part,
        guint offset, MailDisplay *md, GtkHTML *html, GtkHTMLStream *stream)
{
    int mode, len, state = CAMEL_UUDECODE_STATE_INIT;
    char *filename, *estart, *p, *out;
    guint32 save = 0;
    CamelMimePart *part;
    
    /* Make sure it's a real uudecode begin line:
     * begin [0-7]+ .*
     */
    mode = strtoul (start + 6, &p, 8);
    if (p == start + 6 || *p != ' ')
        return start;
    estart = strchr (start, '\n');
    if (!estart)
        return start;
    
    while (isspace ((unsigned char)*p))
        p++;
    filename = g_strndup (p, estart++ - p);
    
    /* Make sure there's an end line. */
    p = strstr (p, "\nend\n");
    if (!p) {
        g_free (filename);
        return start;
    }
    
    out = g_malloc (p - estart);
    len = uudecode_step (estart, p - estart, out, &state, &save);
    
    part = fake_mime_part_from_data (out, len, "application/octet-stream",
                     offset, md);
    g_free (out);
    camel_mime_part_set_filename (part, filename);
    g_free (filename);
    camel_object_hook_event (CAMEL_OBJECT (md->current_message),
                 "finalize", destroy_part, part);
    
    write_hr (html, stream);
    format_mime_part (part, md, html, stream);
    
    return p + 4;
}

static char *
try_inline_binhex (char *start, CamelMimePart *mime_part,
           guint offset, MailDisplay *md, GtkHTML *html, GtkHTMLStream *stream)
{
    char *p;
    CamelMimePart *part;
    
    /* Find data start. */
    p = strstr (start, "\n:");
    if (!p)
        return start;
    
    /* And data end. */
    p = strchr (p + 2, ':');
    if (!p || (*(p + 1) != '\n' && *(p + 1) != '\0'))
        return start;
    p += 2;
    
    part = fake_mime_part_from_data (start, p - start,
                     "application/mac-binhex40",
                     offset, md);
    camel_object_hook_event (CAMEL_OBJECT (md->current_message),
                 "finalize", destroy_part, part);
    
    write_hr (html, stream);
    format_mime_part (part, md, html, stream);
    
    return p;
}

static void
g_string_append_len (GString *string, const char *str, int len)
{
    char *tmp;
    
    tmp = g_malloc (len + 1);
    tmp[len] = 0;
    memcpy (tmp, str, len);
    g_string_append (string, tmp);
    g_free (tmp);
}

/* text/enriched (RFC 1896) or text/richtext (included in RFC 1341) */
static gboolean
handle_text_enriched (CamelMimePart *part, const char *mime_type,
              MailDisplay *md, GtkHTML *html, GtkHTMLStream *stream)
{
    static GHashTable *translations = NULL;
    CamelDataWrapper *wrapper =
        camel_medium_get_content_object (CAMEL_MEDIUM (part));
    GByteArray *ba, *bytes;
    char *text, *p, *xed;
    int len, nofill = 0;
    gboolean enriched;
    GString *string;
    
    if (!translations) {
        translations = g_hash_table_new (g_strcase_hash,
                         g_strcase_equal);
        g_hash_table_insert (translations, "bold", "<b>");
        g_hash_table_insert (translations, "/bold", "</b>");
        g_hash_table_insert (translations, "italic", "<i>");
        g_hash_table_insert (translations, "/italic", "</i>");
        g_hash_table_insert (translations, "fixed", "<tt>");
        g_hash_table_insert (translations, "/fixed", "</tt>");
        g_hash_table_insert (translations, "smaller", "<font size=-1>");
        g_hash_table_insert (translations, "/smaller", "</font>");
        g_hash_table_insert (translations, "bigger", "<font size=+1>");
        g_hash_table_insert (translations, "/bigger", "</font>");
        g_hash_table_insert (translations, "underline", "<u>");
        g_hash_table_insert (translations, "/underline", "</u>");
        g_hash_table_insert (translations, "center", "<p align=center>");
        g_hash_table_insert (translations, "/center", "</p>");
        g_hash_table_insert (translations, "flushleft", "<p align=left>");
        g_hash_table_insert (translations, "/flushleft", "</p>");
        g_hash_table_insert (translations, "flushright", "<p align=right>");
        g_hash_table_insert (translations, "/flushright", "</p>");
        g_hash_table_insert (translations, "excerpt", "<blockquote>");
        g_hash_table_insert (translations, "/excerpt", "</blockquote>");
        g_hash_table_insert (translations, "paragraph", "<p>");
        g_hash_table_insert (translations, "signature", "<address>");
        g_hash_table_insert (translations, "/signature", "</address>");
        g_hash_table_insert (translations, "comment", "<!-- ");
        g_hash_table_insert (translations, "/comment", " -->");
        g_hash_table_insert (translations, "param", "<!-- ");
        g_hash_table_insert (translations, "/param", " -->");
        g_hash_table_insert (translations, "np", "<hr>");
    }
    
    bytes = mail_format_get_data_wrapper_text (wrapper, md);
    if (!bytes)
        return FALSE;
    
    if (!g_strcasecmp (mime_type, "text/richtext")) {
        enriched = FALSE;
        mail_html_write (html, stream,
                 "\n<!-- text/richtext -->\n");
    } else {
        enriched = TRUE;
        mail_html_write (html, stream,
                 "\n<!-- text/enriched -->\n");
    }
    
    /* This is not great code, but I don't feel like fixing it right
     * now. I mean, it's just text/enriched...
     */
    string = g_string_sized_new (2 * bytes->len);
    g_byte_array_append (bytes, "", 1);
    p = text = bytes->data;
    g_byte_array_free (bytes, FALSE);
    
    while (p) {
        len = strcspn (p, " <>&\n");
        if (len)
            g_string_append_len (string, p, len);
        
        p += len;
        if (!*p)
            break;
        
        switch (*p++) {
        case ' ':
            while (*p == ' ') {
                g_string_append (string, "&nbsp;");
                p++;
            }
            g_string_append (string, " ");
            break;
        case '\n':
            g_string_append (string, " ");
            if (enriched && nofill <= 0) {
                while (*p == '\n') {
                    g_string_append (string, "<br>");
                    p++;
                }
            }
            break;
        case '>':
            g_string_append (string, "&gt;");
            break;
        case '&':
            g_string_append (string, "&amp;");
            break;
        case '<':
            if (enriched) {
                if (*p == '<') {
                    g_string_append (string, "&lt;");
                    p++;
                    break;
                }
            } else {
                if (strncmp (p, "lt>", 3) == 0) {
                    g_string_append (string, "&lt;");
                    p += 3;
                    break;
                } else if (strncmp (p, "nl>", 3) == 0) {
                    g_string_append (string, "<br>");
                    p += 3;
                    break;
                }
            }
            
            if (strncmp (p, "nofill>", 7) == 0) {
                nofill++;
                g_string_append (string, "<pre>");
            } else if (strncmp (p, "/nofill>", 8) == 0) {
                nofill--;
                g_string_append (string, "</pre>");
            } else {
                char *copy, *match;
                
                len = strcspn (p, ">");
                copy = g_strndup (p, len);
                match = g_hash_table_lookup (translations,
                                 copy);
                g_free (copy);
                if (match)
                    g_string_append (string, match);
            }
            
            p = strchr (p, '>');
            if (p)
                p++;
        }
    }
    g_free (text);
    
    ba = g_byte_array_new ();
    g_byte_array_append (ba, (const guint8 *)string->str,
                 string->len);
    g_string_free (string, TRUE);
    
    xed = g_strdup_printf ("x-evolution-data:%p", part);
    gtk_html_stream_printf (stream, "<iframe src=\"%s\" frameborder=0 scrolling=no></iframe>", xed);
    mail_display_add_url (md, "data_urls", xed, ba);
    
    return TRUE;
}

static gboolean
handle_text_html (CamelMimePart *part, const char *mime_type,
          MailDisplay *md, GtkHTML *html, GtkHTMLStream *stream)
{
    const char *location, *base;
    
    mail_html_write (html, stream, "\n<!-- text/html -->\n");
    
    if ((base = camel_medium_get_header (CAMEL_MEDIUM (part), "Content-Base"))) {
        char *base_url;
        size_t len;
        
        len = strlen (base);
        
        if (*base == '"' && *(base + len - 1) == '"') {
            len -= 2;
            base_url = alloca (len + 1);
            memcpy (base_url, base + 1, len);
            base_url[len] = '\0';
            base = base_url;
        }
        
        gtk_html_set_base (html, base);
    }
    
    location = get_location (part, md);
    if (!location)
        location = get_cid (part, md);
    gtk_html_stream_printf (stream, "<iframe src=\"%s\" frameborder=0 scrolling=no></iframe>", location);
    return TRUE;
}

static gboolean
handle_image (CamelMimePart *part, const char *mime_type, MailDisplay *md, GtkHTML *html, GtkHTMLStream *stream)
{
    gtk_html_stream_printf (stream, "<img hspace=10 vspace=10 src=\"%s\">",
                get_cid (part, md));
    return TRUE;
}

static gboolean
handle_multipart_mixed (CamelMimePart *part, const char *mime_type,
            MailDisplay *md, GtkHTML *html, GtkHTMLStream *stream)
{
    CamelDataWrapper *wrapper =
        camel_medium_get_content_object (CAMEL_MEDIUM (part));
    CamelMultipart *mp;
    int i, nparts;
    gboolean output = FALSE;
    
    g_return_val_if_fail (CAMEL_IS_MULTIPART (wrapper), FALSE);
    mp = CAMEL_MULTIPART (wrapper);

    nparts = camel_multipart_get_number (mp);   
    for (i = 0; i < nparts; i++) {
        if (i != 0 && output)
            write_hr (html, stream);

        part = camel_multipart_get_part (mp, i);
        
        output = format_mime_part (part, md, html, stream);
    }

    return TRUE;
}

static gboolean
handle_multipart_digest (CamelMimePart *part, const char *mime_type,
             MailDisplay *md, GtkHTML *html, GtkHTMLStream *stream)
{
    CamelDataWrapper *wrapper =
        camel_medium_get_content_object (CAMEL_MEDIUM (part));
    
    g_return_val_if_fail (CAMEL_IS_MULTIPART (wrapper), FALSE);
    
    gtk_html_stream_printf (stream, "&nbsp;&nbsp;&nbsp;&nbsp;<a href=\"digest:\"><img src=\"%s\">%s</a>",
                mail_display_get_url_for_icon (md, EVOLUTION_ICONSDIR "/envelope.png"),
                U_("View messages..."));
    
    return TRUE;
}

static gboolean
handle_multipart_encrypted (CamelMimePart *part, const char *mime_type,
                MailDisplay *md, GtkHTML *html, GtkHTMLStream *stream)
{
    CamelDataWrapper *wrapper;
    CamelMimePart *mime_part;
    CamelException ex;
    
    wrapper = camel_medium_get_content_object (CAMEL_MEDIUM (part));
    
    g_return_val_if_fail (CAMEL_IS_MULTIPART (wrapper), FALSE);
    
    /* Currently we only handle RFC2015-style PGP encryption. */
    if (!camel_pgp_mime_is_rfc2015_encrypted (part))
        return handle_multipart_mixed (part, mime_type, md, html, stream);
    
    camel_exception_init (&ex);
    mime_part = mail_crypto_pgp_mime_part_decrypt (part, &ex);
    
    if (camel_exception_is_set (&ex)) {
        char *error;
        
        error = e_utf8_from_locale_string (camel_exception_get_description (&ex));
        
        mail_error_printf (html, stream, "\n%s\n", error);
        g_free (error);
        
        camel_exception_clear (&ex);
        return TRUE;
    } else {
        /* replace the encrypted part with the decrypted part */
        camel_medium_set_content_object (CAMEL_MEDIUM (part),
                         camel_medium_get_content_object (CAMEL_MEDIUM (mime_part)));
        camel_object_unref (CAMEL_OBJECT (mime_part));
        
        /* and continue on our merry way... */
        return format_mime_part (part, md, html, stream);
    }
}

static gboolean
handle_multipart_signed (CamelMimePart *part, const char *mime_type,
             MailDisplay *md, GtkHTML *html, GtkHTMLStream *stream)
{
    CamelMimePart *subpart;
    CamelDataWrapper *wrapper;
    CamelMultipartSigned *mps;
    gboolean output = FALSE;
    
    wrapper = camel_medium_get_content_object (CAMEL_MEDIUM (part));
    
    g_return_val_if_fail (CAMEL_IS_MULTIPART_SIGNED (wrapper), FALSE);
    
    mps = CAMEL_MULTIPART_SIGNED(wrapper);

    /* if subpart & signature is null, what do we do?  just write it out raw?
       multipart_signed will, if it cannot parse properly, put everything in the first part
       this includes: more or less than 2 parts */

    /* output the content */
    subpart = camel_multipart_get_part((CamelMultipart *)mps, CAMEL_MULTIPART_SIGNED_CONTENT);
    if (subpart == NULL)
        return FALSE;

    output = format_mime_part (subpart, md, html, stream);

    /* now handle the signature */
    subpart = camel_multipart_get_part((CamelMultipart *)mps, CAMEL_MULTIPART_SIGNED_SIGNATURE);
    if (subpart == NULL)
        return FALSE;

    mail_part_set_default_displayed_inline(subpart, md, FALSE);
    
    if (!mail_part_is_displayed_inline (subpart, md) && !md->printing) {
        char *url;
        
        /* Write out the click-for-info object */
        url = g_strdup_printf ("signature:%p/%lu", subpart,
                       (unsigned long)time (NULL));
        gtk_html_stream_printf (stream,
                    "<br><table cellspacing=0 cellpadding=0>"
                    "<tr><td><table width=10 cellspacing=0 cellpadding=0>"
                    "<tr><td></td></tr></table></td>"
                    "<td><object classid=\"%s\"></object></td>"
                    "<td><table width=3 cellspacing=0 cellpadding=0>"
                    "<tr><td></td></tr></table></td>"
                    "<td><font size=-1>", url);
        mail_display_add_url (md, "part_urls", url, subpart);
        
        mail_html_write (html, stream, 
                 U_("This message is digitally signed. "
                    "Click the lock icon for more information."));
        
        mail_html_write (html, stream,
                 "</font></td></tr><tr><td height=10><table height=10 cellspacing=0 cellpadding=0>"
                 "<tr><td></td></tr></table></td></tr></table>\n");
    } else {
        CamelCipherValidity *valid = NULL;
        CamelException ex;
        const char *message = NULL;
        gboolean good = FALSE;
        CamelPgpContext *context;
        
        /* Write out the verification results */
        /* TODO: use the right context for the right message ... */
        camel_exception_init (&ex);
        context = camel_pgp_context_new(session, mail_config_get_pgp_type(), mail_config_get_pgp_path());
        if (context) {
            valid = camel_multipart_signed_verify(mps, (CamelCipherContext *)context, &ex);
            if (valid) {
                good = camel_cipher_validity_get_valid(valid);
                message = camel_cipher_validity_get_description(valid);
            } else {
                message = camel_exception_get_description(&ex);
            }
        } else {
            message = U_("Could not create a PGP verfication context");
        }
        
        if (good) {
            gtk_html_stream_printf (stream,
                        "<table><tr valign=top>"
                        "<td><img src=\"%s\"></td>"
                        "<td>%s<br><br>",
                        mail_display_get_url_for_icon (md, EVOLUTION_ICONSDIR "/pgp-signature-ok.png"),
                        U_("This message is digitally signed and "
                           "has been found to be authentic."));
        } else {
            gtk_html_stream_printf (stream,
                        "<table><tr valign=top>"
                        "<td><img src=\"%s\"></td>"
                        "<td>%s<br><br>",
                        mail_display_get_url_for_icon (md, EVOLUTION_ICONSDIR "/pgp-signature-bad.png"),
                        U_("This message is digitally signed but can "
                           "not be proven to be authentic."));
        }
        
        if (message) {
            gtk_html_stream_printf (stream, "<font size=-1 %s>", good || md->printing ? "" : "color=red");
            mail_text_write (html, stream, md->printing, message);
            mail_html_write (html, stream, "</font>");
        }
        
        mail_html_write (html, stream, "</td></tr></table>");
        camel_exception_clear (&ex);
        camel_cipher_validity_free (valid);
    }

    return TRUE;
}

/* As seen in RFC 2387! */
static gboolean
handle_multipart_related (CamelMimePart *part, const char *mime_type,
              MailDisplay *md, GtkHTML *html, GtkHTMLStream *stream)
{
    CamelDataWrapper *wrapper = camel_medium_get_content_object (CAMEL_MEDIUM (part));
    CamelMultipart *mp;
    CamelMimePart *body_part, *display_part = NULL;
    CamelContentType *content_type;
    const char *location, *start;
    int i, nparts;
    GHashTable *related_save;
    int ret;
    
    g_return_val_if_fail (CAMEL_IS_MULTIPART (wrapper), FALSE);
    
    mp = CAMEL_MULTIPART (wrapper);
    nparts = camel_multipart_get_number (mp);   
    
    content_type = camel_mime_part_get_content_type (part);
    start = header_content_type_param (content_type, "start");
    if (start) {
        int len;
        
        /* The "start" parameter includes <>s, which Content-Id
         * does not.
         */
        len = strlen (start) - 2;
        
        for (i = 0; i < nparts; i++) {
            const char *cid;
            
            body_part = camel_multipart_get_part (mp, i);
            cid = camel_mime_part_get_content_id (body_part);
            
            if (!strncmp (cid, start + 1, len) &&
                strlen (cid) == len) {
                display_part = body_part;
                break;
            }
        }
    } else {
        /* No start parameter, so it defaults to the first part. */
        display_part = camel_multipart_get_part (mp, 0);
    }
    
    if (!display_part) {
        /* Oops. Hrmph. */
        return handle_multipart_mixed (part, mime_type, md, html, stream);
    }
    
    /* setup a 'stack' of related parts */
    related_save = md->related;
    md->related = g_hash_table_new(NULL, NULL);
    
    location = camel_mime_part_get_content_location (part);
    if (location)
        mail_display_push_content_location (md, location);
    
    /* Record the Content-ID/Content-Location of any non-displayed parts. */
    for (i = 0; i < nparts; i++) {
        body_part = camel_multipart_get_part (mp, i);
        if (body_part == display_part)
            continue;
        
        get_cid (body_part, md);
        get_location (body_part, md);
        g_hash_table_insert(md->related, body_part, body_part);
    }
    
    /* Now, display the displayed part. */
    ret = format_mime_part (display_part, md, html, stream);
    
    /* FIXME: flush html stream via gtkhtml_stream_flush which doens't exist yet ... */
    while (gtk_events_pending ())
        gtk_main_iteration ();
    
    /* Now check for related parts which didn't display, display them as attachments */
    for (i = 0; i < nparts; i++) {
        body_part = camel_multipart_get_part (mp, i);
        if (body_part == display_part)
            continue;
        
        if (g_hash_table_lookup(md->related, body_part)) {
            if (ret)
                write_hr (html, stream);
            ret |= format_mime_part (body_part, md, html, stream);
        }
    }
    
    g_hash_table_destroy (md->related);
    md->related = related_save;
    
    if (location)
        mail_display_pop_content_location (md);
    
    return ret;
}

/* RFC 2046 says "display the last part that you are able to display". */
static CamelMimePart *
find_preferred_alternative (CamelMultipart *multipart, gboolean want_plain)
{
    int i, nparts;
    CamelMimePart *preferred_part = NULL;
    MailMimeHandler *handler;

    nparts = camel_multipart_get_number (multipart);
    for (i = 0; i < nparts; i++) {
        CamelMimePart *part = camel_multipart_get_part (multipart, i);
        CamelContentType *type = camel_mime_part_get_content_type (part);
        char *mime_type = header_content_type_simple (type);

        g_strdown (mime_type);
        if (want_plain && !strcmp (mime_type, "text/plain"))
            return part;
        handler = mail_lookup_handler (mime_type);
        if (handler && (!preferred_part || !handler->generic))
            preferred_part = part;
        g_free (mime_type);
    }

    return preferred_part;
}

static gboolean
handle_multipart_alternative (CamelMimePart *part, const char *mime_type,
                  MailDisplay *md, GtkHTML *html, GtkHTMLStream *stream)
{
    CamelDataWrapper *wrapper =
        camel_medium_get_content_object (CAMEL_MEDIUM (part));
    CamelMultipart *multipart;
    CamelMimePart *mime_part;
    
    g_return_val_if_fail (CAMEL_IS_MULTIPART (wrapper), FALSE);
    
    multipart = CAMEL_MULTIPART (wrapper);
    
    mime_part = find_preferred_alternative (multipart, FALSE);
    if (mime_part)
        return format_mime_part (mime_part, md, html, stream);
    else
        return handle_multipart_mixed (part, mime_type, md, html, stream);
}

/* RFC 1740 */
static gboolean
handle_multipart_appledouble (CamelMimePart *part, const char *mime_type,
                  MailDisplay *md, GtkHTML *html, GtkHTMLStream *stream)
{
    CamelDataWrapper *wrapper =
        camel_medium_get_content_object (CAMEL_MEDIUM (part));
    CamelMultipart *multipart;

    g_return_val_if_fail (CAMEL_IS_MULTIPART (wrapper), FALSE);
    
    multipart = CAMEL_MULTIPART (wrapper);

    /* The first part is application/applefile and is not useful
     * to us. The second part _may_ be displayable data. Most
     * likely it's application/octet-stream though.
     */
    part = camel_multipart_get_part (multipart, 1);
    return format_mime_part (part, md, html, stream);
}

static gboolean
handle_message_rfc822 (CamelMimePart *part, const char *mime_type,
               MailDisplay *md, GtkHTML *html, GtkHTMLStream *stream)
{
    CamelDataWrapper *wrapper =
        camel_medium_get_content_object (CAMEL_MEDIUM (part));
    
    g_return_val_if_fail (CAMEL_IS_MIME_MESSAGE (wrapper), FALSE);
    
    mail_html_write (html, stream, "<blockquote>");
    mail_format_mime_message (CAMEL_MIME_MESSAGE (wrapper), md, html, stream);
    mail_html_write (html, stream, "</blockquote>");
    
    return TRUE;
}

static gboolean
handle_message_external_body (CamelMimePart *part, const char *mime_type,
                  MailDisplay *md, GtkHTML *html, GtkHTMLStream *stream)
{
    CamelContentType *type;
    const char *access_type;
    char *url = NULL, *desc = NULL;
    char *fmt;
    
    type = camel_mime_part_get_content_type (part);
    access_type = header_content_type_param (type, "access-type");
    if (!access_type)
        goto fallback;
    
    if (!g_strcasecmp (access_type, "ftp") ||
        !g_strcasecmp (access_type, "anon-ftp")) {
        const char *name, *site, *dir, *mode, *ftype;
        char *path;
        
        name = header_content_type_param (type, "name");
        site = header_content_type_param (type, "site");
        if (name == NULL || site == NULL)
            goto fallback;
        dir = header_content_type_param (type, "directory");
        mode = header_content_type_param (type, "mode");
        
        /* Generate the path. */
        if (dir) {
            const char *p = dir + strlen (dir);
            
            path = g_strdup_printf ("%s%s%s%s",
                        *dir == '/' ? "" : "/",
                        dir,
                        *p == '/' ? "" : "/",
                        name);
        } else {
            path = g_strdup_printf ("%s%s",
                        *name == '/' ? "" : "/",
                        name);
        }
        
        if (mode && *mode == 'A')
            ftype = ";type=A";
        else if (mode && *mode == 'I')
            ftype = ";type=I";
        else
            ftype = "";
        
        url = g_strdup_printf ("ftp://%s%s%s", site, path, ftype);
        g_free (path);
        fmt = e_utf8_from_locale_string (_("Pointer to FTP site (%s)"));
        desc = g_strdup_printf (fmt, url);
        g_free (fmt);
    } else if (!g_strcasecmp (access_type, "local-file")) {
        const char *name, *site;
        
        name = header_content_type_param (type, "name");
        if (name == NULL)
            goto fallback;
        site = header_content_type_param (type, "site");
        
        url = g_strdup_printf ("file://%s%s", *name == '/' ? "" : "/",
                       name);
        if (site) {
            fmt = e_utf8_from_locale_string (_("Pointer to local file (%s) "
                               "valid at site \"%s\""));
            desc = g_strdup_printf (fmt, name, site);
            g_free (fmt);
        } else {
            fmt = e_utf8_from_locale_string (_("Pointer to local file (%s)"));
            desc = g_strdup_printf (fmt, name);
            g_free (fmt);
        }
    } else if (!g_strcasecmp (access_type, "URL")) {
        const char *urlparam;
        char *s, *d;
        
        /* RFC 2017 */
        
        urlparam = header_content_type_param (type, "url");
        if (urlparam == NULL)
            goto fallback;
        
        /* For obscure MIMEy reasons, the URL may be split into
         * multiple words, and needs to be rejoined. (The URL
         * must have any real whitespace %-encoded, so we just
         * get rid of all of it.
         */
        url = g_strdup (urlparam);
        s = d = url;
        
        while (*s) {
            if (!isspace ((unsigned char)*s))
                *d++ = *s;
            s++;
        }
        *d = *s;
        
        fmt = e_utf8_from_locale_string (_("Pointer to remote data (%s)"));
        desc = g_strdup_printf (fmt, url);
        g_free (fmt);
    }
    
 fallback:
    if (!desc) {
        if (access_type) {
            fmt = e_utf8_from_locale_string (_("Pointer to unknown external data "
                               "(\"%s\" type)"));
            desc = g_strdup_printf (fmt, access_type);
            g_free (fmt);
        } else
            desc = e_utf8_from_locale_string (_("Malformed external-body part."));
    }
    
#if 0 /* FIXME */
    handle_mystery (part, md, url, "gnome-globe.png", desc,
            url ? "open it in a browser" : NULL);
#endif
    
    g_free (desc);
    g_free (url);
    return TRUE;
}

static gboolean
handle_via_bonobo (CamelMimePart *part, const char *mime_type,
           MailDisplay *md, GtkHTML *html, GtkHTMLStream *stream)
{
    if (! md->printing) {
        gtk_html_stream_printf (stream,
                    "<object classid=\"%s\" type=\"%s\"></object>",
                    get_cid (part, md), mime_type);
    }

    return TRUE;
}

/**
 * mail_get_message_rfc822:
 * @message: the message
 * @want_plain: whether the caller prefers plain to html
 * @cite: whether or not to cite the message text
 *
 * See mail_get_message_body() below for more details.
 *
 * Return value: an HTML string representing the text parts of @message.
 **/
static char *
mail_get_message_rfc822 (CamelMimeMessage *message, gboolean want_plain, gboolean cite)
{
    CamelDataWrapper *contents;
    GString *retval;
    const CamelInternetAddress *cia;
    char *text, *citation, *buf, *html;
    time_t date_val;
    int offset;

    contents = camel_medium_get_content_object (CAMEL_MEDIUM (message));
    text = mail_get_message_body (contents, want_plain, cite);
    if (!text)
        text = g_strdup ("");
    citation = cite ? "&gt; " : "";
    retval = g_string_new (NULL);

    /* Kludge: if text starts with "<PRE>", wrap it around the
     * headers too so we won't get a blank line between them for the
     * <P> to <PRE> switch.
     */
    if (!g_strncasecmp (text, "<pre>", 5))
        g_string_sprintfa (retval, "<PRE>");

    /* create credits */
    cia = camel_mime_message_get_from (message);
    buf = camel_address_format (CAMEL_ADDRESS (cia));
    if (buf) {
        html = e_text_to_html (buf, E_TEXT_TO_HTML_CONVERT_NL);
        g_string_sprintfa (retval, "%s<b>From:</b> %s<br>",
                   citation, html);
        g_free (html);
        g_free (buf);
    }

    cia = camel_mime_message_get_recipients (message, CAMEL_RECIPIENT_TYPE_TO);
    buf = camel_address_format (CAMEL_ADDRESS (cia));
    if (buf) {
        html = e_text_to_html (buf, E_TEXT_TO_HTML_CONVERT_NL);
        g_string_sprintfa (retval, "%s<b>To:</b> %s<br>",
                   citation, html);
        g_free (html);
        g_free (buf);
    }

    cia = camel_mime_message_get_recipients (message, CAMEL_RECIPIENT_TYPE_CC);
    buf = camel_address_format (CAMEL_ADDRESS (cia));
    if (buf) {
        html = e_text_to_html (buf, E_TEXT_TO_HTML_CONVERT_NL);
        g_string_sprintfa (retval, "%s<b>Cc:</b> %s<br>",
                   citation, html);
        g_free (html);
        g_free (buf);
    }

    buf = (char *) camel_mime_message_get_subject (message);
    if (buf) {
        html = e_text_to_html (buf, E_TEXT_TO_HTML_CONVERT_NL | E_TEXT_TO_HTML_CONVERT_URLS);
        g_string_sprintfa (retval, "%s<b>Subject:</b> %s<br>",
                   citation, html);
        g_free (html);
    }

    date_val = camel_mime_message_get_date (message, &offset);
    buf = header_format_date (date_val, offset);
    html = e_text_to_html (buf, E_TEXT_TO_HTML_CONVERT_NL);
    g_string_sprintfa (retval, "%s<b>Date:</b> %s<br>", citation, html);
    g_free (html);

    if (!g_strncasecmp (text, "<pre>", 5))
        g_string_sprintfa (retval, "%s<br>%s", citation, text + 5);
    else
        g_string_sprintfa (retval, "%s<br>%s", citation, text);
    g_free (text);

    buf = retval->str;
    g_string_free (retval, FALSE);
    return buf;
}

/**
 * mail_get_message_body:
 * @data: the message or mime part content
 * @want_plain: whether the caller prefers plain to html
 * @cite: whether or not to cite the message text
 *
 * This creates an HTML string representing @data. If @want_plain is %TRUE,
 * it will be an HTML string that looks like a text/plain representation
 * of @data (but it will still be HTML).
 *
 * If @cite is %TRUE, the message will be cited as a reply, using "> "s.
 *
 * Return value: the HTML string, which the caller must free, or
 * %NULL if @data doesn't include any data which should be forwarded or
 * replied to.
 **/
char *
mail_get_message_body (CamelDataWrapper *data, gboolean want_plain, gboolean cite)
{
    char *subtext, *old, *div, *text = NULL;
    CamelContentType *mime_type;
    GByteArray *bytes = NULL;
    CamelMimePart *subpart;
    CamelMultipart *mp;
    int i, nparts;
    
    mime_type = camel_data_wrapper_get_mime_type_field (data);
    
    /* If it is message/rfc822 or message/news, extract the
     * important headers and recursively process the body.
     */
    if (header_content_type_is (mime_type, "message", "rfc822") ||
        header_content_type_is (mime_type, "message", "news"))
        return mail_get_message_rfc822 (CAMEL_MIME_MESSAGE (data), want_plain, cite);
    
    /* If it's a vcard or icalendar, ignore it. */
    if (header_content_type_is (mime_type, "text", "x-vcard") ||
        header_content_type_is (mime_type, "text", "calendar"))
        return NULL;
    
    /* Get the body data for other text/ or message/ types */
    if (header_content_type_is (mime_type, "text", "*") ||
        header_content_type_is (mime_type, "message", "*")) {
        bytes = mail_format_get_data_wrapper_text (data, NULL);
        
        if (bytes) {
            g_byte_array_append (bytes, "", 1);
            text = bytes->data;
            g_byte_array_free (bytes, FALSE);
        }
        
        if (text && !header_content_type_is (mime_type, "text", "html")) {
            char *html;
            
            html = e_text_to_html (text, E_TEXT_TO_HTML_PRE | (cite ? E_TEXT_TO_HTML_CITE : 0));
            g_free (text);
            text = html;
        }
        return text;
    }
    
    /* If it's not message and it's not text, and it's not
     * multipart, we don't want to deal with it.
     */
    if (!header_content_type_is (mime_type, "multipart", "*"))
        return NULL;
    
    mp = CAMEL_MULTIPART (data);
    
    if (header_content_type_is (mime_type, "multipart", "alternative")) {
        /* Pick our favorite alternative and reply to it. */
        
        subpart = find_preferred_alternative (mp, want_plain);
        if (!subpart)
            return NULL;
        
        data = camel_medium_get_content_object (CAMEL_MEDIUM (subpart));
        return mail_get_message_body (data, want_plain, cite);
    }
    
    /* Otherwise, concatenate all the parts that we can. */
    if (want_plain) {
        if (cite)
            div = "<br>\n&gt; ----<br>\n&gt; <br>\n";
        else
            div = "<br>\n----<br>\n<br>\n";
    } else
        div = "<br><hr><br>";
    
    nparts = camel_multipart_get_number (mp);
    for (i = 0; i < nparts; i++) {
        subpart = camel_multipart_get_part (mp, i);
        
        /* only add to the body contents if it is marked as "inline" */
        if (!mail_part_is_inline (subpart))
            continue;
        
        data = camel_medium_get_content_object (CAMEL_MEDIUM (subpart));
        subtext = mail_get_message_body (data, want_plain, cite);
        if (!subtext)
            continue;
        
        if (text) {
            old = text;
            text = g_strdup_printf ("%s%s%s", old, div, subtext);
            g_free (subtext);
            g_free (old);
        } else
            text = subtext;
    }
    
    return text;
}