path: root/camel/camel-mime-part.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* camelMimePart.c : Abstract class for a mime_part */

/* 
 * Authors: Bertrand Guiheneuf <bertrand@helixcode.com>
 *      Michael Zucchi <notzed@helixcode.com>
 *
 * Copyright 1999, 2000 Helix Code, Inc. (http://www.helixcode.com)
 *
 * This program is free software; you can redistribute it and/or 
 * modify it under the terms of the GNU General Public License as 
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * 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
 */

#include <config.h>
#include <string.h>
#include "camel-mime-part.h"
#include <stdio.h>
#include "gmime-content-field.h"
#include "string-utils.h"
#include "gmime-utils.h"
#include "camel-simple-data-wrapper.h"
#include "hash-table-utils.h"
#include "camel-stream-mem.h"
#include "camel-mime-part-utils.h"
#include "camel-seekable-substream.h"
#include "camel-stream-filter.h"
#include "camel-mime-filter-basic.h"
#include "camel-mime-filter-charset.h"
#include <ctype.h>
#include "camel-mime-parser.h"

/* ick, this shouldn't need to know about the parent types ... then again the repository does *sigh* */
#include "camel-mime-message.h"
#include "camel-multipart.h"
#include "camel-mime-body-part.h"

#define d(x)

typedef enum {
    HEADER_UNKNOWN,
    HEADER_DESCRIPTION,
    HEADER_DISPOSITION,
    HEADER_CONTENT_ID,
    HEADER_ENCODING,
    HEADER_CONTENT_MD5,
    HEADER_CONTENT_LANGUAGES,
    HEADER_CONTENT_TYPE
} CamelHeaderType;


static GHashTable *header_name_table;


static CamelMediumClass *parent_class=NULL;

/* Returns the class for a CamelMimePart */
#define CMP_CLASS(so) CAMEL_MIME_PART_CLASS (GTK_OBJECT(so)->klass)
#define CDW_CLASS(so) CAMEL_DATA_WRAPPER_CLASS (GTK_OBJECT(so)->klass)
#define CMD_CLASS(so) CAMEL_MEDIUM_CLASS (GTK_OBJECT(so)->klass)

/* from GtkObject */
static void            my_finalize (GtkObject *object);

/* from CamelDataWrapper */
static void            my_write_to_stream              (CamelDataWrapper *data_wrapper, 
                            CamelStream *stream);
static void            my_construct_from_stream        (CamelDataWrapper *data_wrapper, 
                            CamelStream *stream);
static void            construct_from_parser           (CamelDataWrapper *, CamelMimeParser *);
static void            my_set_input_stream             (CamelDataWrapper *data_wrapper, 
                            CamelStream *stream);
static CamelStream *   my_get_output_stream            (CamelDataWrapper *data_wrapper);


/* from CamelMedia */ 
static void            add_header                      (CamelMedium *medium, const char *header_name, const char *header_value);
static void            set_header                      (CamelMedium *medium, const char *header_name, const char *header_value);
static void            remove_header                   (CamelMedium *medium, const char *header_name);

static void            my_set_content_object           (CamelMedium *medium, 
                            CamelDataWrapper *content);
static CamelDataWrapper *my_get_content_object         (CamelMedium *medium);

/* forward references */
static void set_disposition (CamelMimePart *mime_part, const gchar *disposition);


/* loads in a hash table the set of header names we */
/* recognize and associate them with a unique enum  */
/* identifier (see CamelHeaderType above)           */
static void
my_init_header_name_table()
{
    header_name_table = g_hash_table_new (g_strcase_hash, g_strcase_equal);
    g_hash_table_insert (header_name_table, "Content-Description", (gpointer)HEADER_DESCRIPTION);
    g_hash_table_insert (header_name_table, "Content-Disposition", (gpointer)HEADER_DISPOSITION);
    g_hash_table_insert (header_name_table, "Content-id", (gpointer)HEADER_CONTENT_ID);
    g_hash_table_insert (header_name_table, "Content-Transfer-Encoding", (gpointer)HEADER_ENCODING);
    g_hash_table_insert (header_name_table, "Content-MD5", (gpointer)HEADER_CONTENT_MD5);
    g_hash_table_insert (header_name_table, "Content-Type", (gpointer)HEADER_CONTENT_TYPE);
    
}

static void
camel_mime_part_class_init (CamelMimePartClass *camel_mime_part_class)
{
    CamelMediumClass *camel_medium_class = CAMEL_MEDIUM_CLASS (camel_mime_part_class);
    CamelDataWrapperClass *camel_data_wrapper_class = CAMEL_DATA_WRAPPER_CLASS (camel_mime_part_class);
    GtkObjectClass *gtk_object_class = GTK_OBJECT_CLASS (camel_data_wrapper_class);

    parent_class = gtk_type_class (camel_medium_get_type ());
    my_init_header_name_table();
    
    /* virtual method overload */   
    camel_medium_class->add_header                = add_header;
    camel_medium_class->set_header                = set_header;
    camel_medium_class->remove_header             = remove_header;
    camel_medium_class->set_content_object        = my_set_content_object;
    camel_medium_class->get_content_object        = my_get_content_object;

    camel_data_wrapper_class->write_to_stream     = my_write_to_stream;
    camel_data_wrapper_class->construct_from_stream = my_construct_from_stream;
    camel_data_wrapper_class->construct_from_parser = construct_from_parser;
    camel_data_wrapper_class->set_input_stream    = my_set_input_stream;
/*  camel_data_wrapper_class->get_output_stream   = my_get_output_stream;*/

    gtk_object_class->finalize                    = my_finalize;
}

static void
camel_mime_part_init (gpointer   object,  gpointer   klass)
{
    CamelMimePart *camel_mime_part = CAMEL_MIME_PART (object);
    
    camel_mime_part->content_type         = gmime_content_field_new ("text", "plain");
    camel_mime_part->description          = NULL;
    camel_mime_part->disposition          = NULL;
    camel_mime_part->content_id           = NULL;
    camel_mime_part->content_MD5          = NULL;
    camel_mime_part->content_languages    = NULL;
    camel_mime_part->encoding             = CAMEL_MIME_PART_ENCODING_DEFAULT;

    camel_mime_part->temp_message_buffer  = NULL;   
    camel_mime_part->content_input_stream = NULL;
}




GtkType
camel_mime_part_get_type (void)
{
    static GtkType camel_mime_part_type = 0;
    
    if (!camel_mime_part_type)  {
        GtkTypeInfo camel_mime_part_info =  
        {
            "CamelMimePart",
            sizeof (CamelMimePart),
            sizeof (CamelMimePartClass),
            (GtkClassInitFunc) camel_mime_part_class_init,
            (GtkObjectInitFunc) camel_mime_part_init,
                /* reserved_1 */ NULL,
                /* reserved_2 */ NULL,
            (GtkClassInitFunc) NULL,
        };
        
        camel_mime_part_type = gtk_type_unique (camel_medium_get_type (), &camel_mime_part_info);
    }
    
    return camel_mime_part_type;
}


static void           
my_finalize (GtkObject *object)
{
    CamelMimePart *mime_part = CAMEL_MIME_PART (object);

    g_free (mime_part->description);
    g_free (mime_part->content_id);
    g_free (mime_part->content_MD5);
    string_list_free (mime_part->content_languages);
    header_disposition_unref(mime_part->disposition);
    
    if (mime_part->content_type) gmime_content_field_unref (mime_part->content_type);
    if (mime_part->temp_message_buffer) g_byte_array_free (mime_part->temp_message_buffer, TRUE);

    if (mime_part->content_input_stream) gtk_object_unref (GTK_OBJECT (mime_part->content_input_stream));

    GTK_OBJECT_CLASS (parent_class)->finalize (object);
}

/* **** */

static gboolean
process_header(CamelMedium *medium, const char *header_name, const char *header_value)
{
    CamelMimePart *mime_part = CAMEL_MIME_PART (medium);
    CamelHeaderType header_type;
    char *text;

    /* Try to parse the header pair. If it corresponds to something   */
    /* known, the job is done in the parsing routine. If not,         */
    /* we simply add the header in a raw fashion                      */

    /* FIXMME: MUST check fields for validity before adding them! */

    header_type = (CamelHeaderType) g_hash_table_lookup (header_name_table, header_name);
    switch (header_type) {
    case HEADER_DESCRIPTION: /* raw header->utf8 conversion */
        text = header_decode_string(header_value);
        g_free(mime_part->description);
        mime_part->description = text;
        break;
    case HEADER_DISPOSITION:
        set_disposition (mime_part, header_value);
        break;
    case HEADER_CONTENT_ID:
        text = header_msgid_decode(header_value);
        g_free(mime_part->content_id);
        mime_part->content_id = text;
        break;
    case HEADER_ENCODING:
        text = header_token_decode(header_value);
        mime_part->encoding = camel_mime_part_encoding_from_string (text);
        g_free(text);
        break;
    case HEADER_CONTENT_MD5:
        g_free(mime_part->content_MD5);
        mime_part->content_MD5 = g_strdup(header_value);
        break;
    case HEADER_CONTENT_TYPE: 
        gmime_content_field_construct_from_string (mime_part->content_type, header_value);
        break;
    default:
        return FALSE;
    }
    return TRUE;
}


static void
set_header (CamelMedium *medium, const char *header_name, const char *header_value)
{
    process_header(medium, header_name, header_value);
    parent_class->set_header (medium, header_name, header_value);
}

static void
add_header (CamelMedium *medium, const char *header_name, const char *header_value)
{
    /* Try to parse the header pair. If it corresponds to something   */
    /* known, the job is done in the parsing routine. If not,         */
    /* we simply add the header in a raw fashion                      */

    /* FIXMME: MUST check fields for validity before adding them! */

    /* If it was one of the headers we handled, it must be unique, set it instead of add */
    if (process_header(medium, header_name, header_value))
        parent_class->set_header (medium, header_name, header_value);
    else
        parent_class->add_header (medium, header_name, header_value);
}

static void
remove_header (CamelMedium *medium, const char *header_name)
{
    process_header(medium, header_name, NULL);
    parent_class->remove_header (medium, header_name);
}


/* **** Content-Description */
void
camel_mime_part_set_description (CamelMimePart *mime_part, const gchar *description)
{
    char *text;

    /* FIXME: convert header, internationalise, etc. */
    text = g_strdup(description);
    /* text = header_encode_string(description); */

    g_free(mime_part->description);
    mime_part->description = text;

    parent_class->set_header ((CamelMedium *)mime_part, "Content-Description", text);
}

const gchar *
camel_mime_part_get_description (CamelMimePart *mime_part)
{
    return mime_part->description;
}

/* **** Content-Disposition */

static void
set_disposition (CamelMimePart *mime_part, const gchar *disposition)
{
    header_disposition_unref(mime_part->disposition);
    if (disposition)
        mime_part->disposition = header_disposition_decode(disposition);
    else
        mime_part->disposition = NULL;
}


void
camel_mime_part_set_disposition (CamelMimePart *mime_part, const gchar *disposition)
{
    char *text;

    /* we poke in a new disposition (so we dont lose 'filename', etc) */
    if (mime_part->disposition == NULL) {
        set_disposition(mime_part, disposition);
    }
    if (mime_part->disposition != NULL) {
        g_free(mime_part->disposition->disposition);
        mime_part->disposition->disposition = g_strdup(disposition);
    }
    text = header_disposition_format(mime_part->disposition);

    parent_class->set_header ((CamelMedium *)mime_part, "Content-Description", text);

    g_free(text);
}

const gchar *
camel_mime_part_get_disposition (CamelMimePart *mime_part)
{
    if (mime_part->disposition)
        return (mime_part->disposition)->disposition;
    else
        return NULL;
}


/* **** Content-Disposition: filename="xxx" */

void
camel_mime_part_set_filename (CamelMimePart *mime_part, gchar *filename)
{
    char *str;
    if (mime_part->disposition == NULL)
        mime_part->disposition = header_disposition_decode("attachment");

    header_set_param(&mime_part->disposition->params, "filename", filename);
    str = header_disposition_format(mime_part->disposition);

    /* we dont want to override what we just created ... */
    parent_class->set_header ((CamelMedium *)mime_part, "Content-Disposition", str);
    g_free(str);
}

const gchar *
camel_mime_part_get_filename (CamelMimePart *mime_part)
{
    if (mime_part->disposition)
        return header_param(mime_part->disposition->params, "filename");
    return NULL;
}


/* **** Content-ID: */

void
camel_mime_part_set_content_id (CamelMimePart *mime_part, const char *contentid)
{
    char *text;

    /* perform a syntax check, just 'cause we can */
    text = header_msgid_decode(contentid);
    if (text == NULL) {
        g_warning("Invalid content id being set: '%s'", contentid);
    } else {
        g_free(text);
    }
    g_free(mime_part->content_id);
    mime_part->content_id = g_strdup(contentid);
    parent_class->set_header ((CamelMedium *)mime_part, "Content-ID", contentid);
}

const gchar *
camel_mime_part_get_content_id (CamelMimePart *mime_part)
{
    return mime_part->content_id;
}

/* **** Content-MD5: */

void
camel_mime_part_set_content_MD5 (CamelMimePart *mime_part, const char *md5)
{
    g_free(mime_part->content_MD5);
    mime_part->content_MD5 = g_strdup(md5);
    parent_class->set_header ((CamelMedium *)mime_part, "Content-MD5", md5);
}

const gchar *
camel_mime_part_get_content_MD5 (CamelMimePart *mime_part)
{
    return mime_part->content_MD5;
}

/* **** Content-Transfer-Encoding: */

void
camel_mime_part_set_encoding (CamelMimePart *mime_part,
                  CamelMimePartEncodingType encoding)
{
    const char *text;

    mime_part->encoding = encoding;
    text = camel_mime_part_encoding_to_string (encoding);
    if (text[0])
        text = g_strdup(text);
    else
        text = NULL;

    parent_class->set_header ((CamelMedium *)mime_part, "Content-Transfer-Encoding", text);
}

const CamelMimePartEncodingType
camel_mime_part_get_encoding (CamelMimePart *mime_part)
{
    return mime_part->encoding;
}

/* FIXME: do something with this stuff ... */

void
camel_mime_part_set_content_languages (CamelMimePart *mime_part, GList *content_languages)
{
    if (mime_part->content_languages) string_list_free (mime_part->content_languages);
    mime_part->content_languages = content_languages;

    /* FIXME: translate to a header and set it */
}

const GList *
camel_mime_part_get_content_languages (CamelMimePart *mime_part)
{
    return mime_part->content_languages;
}


/* **** */

/* **** Content-Type: */

void 
camel_mime_part_set_content_type (CamelMimePart *mime_part, gchar *content_type)
{
    /* FIXME: need a way to specify content-type parameters without putting them
       in a string ... */
    gmime_content_field_construct_from_string (mime_part->content_type, content_type);
    parent_class->set_header ((CamelMedium *)mime_part, "Content-Type", content_type);
}

GMimeContentField *
camel_mime_part_get_content_type (CamelMimePart *mime_part)
{
    return mime_part->content_type;
}

/*********/



static void
my_set_content_object (CamelMedium *medium, CamelDataWrapper *content)
{
    CamelMimePart *mime_part = CAMEL_MIME_PART (medium);
    GMimeContentField *object_content_field;

    parent_class->set_content_object (medium, content);

    object_content_field = camel_data_wrapper_get_mime_type_field (content);
    if (mime_part->content_type && (mime_part->content_type != object_content_field)) {
        char *txt;

        gmime_content_field_unref (mime_part->content_type);
        txt = header_content_type_format(object_content_field?object_content_field->content_type:NULL);
        parent_class->set_header ((CamelMedium *)mime_part, "Content-Type", txt);
    }
    mime_part->content_type = object_content_field;

    gmime_content_field_ref (object_content_field);
}

static CamelDataWrapper *
my_get_content_object (CamelMedium *medium)
{
    CamelMimePart *mime_part = CAMEL_MIME_PART (medium);
    CamelStream *stream;
    CamelStream *decoded_stream;
    CamelMimeFilter *mf = NULL;

    d(printf("getting content object? for %p\n", medium));

    if (!medium->content ) {
        stream = mime_part->content_input_stream; 
        decoded_stream = stream;

        g_warning("No content object, this old code is probably going to crash ...");

        switch (mime_part->encoding) {
        case CAMEL_MIME_PART_ENCODING_QUOTEDPRINTABLE:
            mf = (CamelMimeFilter *)camel_mime_filter_basic_new_type(CAMEL_MIME_FILTER_BASIC_QP_DEC);
            break;
        case CAMEL_MIME_PART_ENCODING_BASE64:
            mf = (CamelMimeFilter *)camel_mime_filter_basic_new_type(CAMEL_MIME_FILTER_BASIC_BASE64_DEC);
            break;
        default:
            break;
        }

        if (mf) {
            decoded_stream = (CamelStream *)camel_stream_filter_new_with_stream (stream);
            camel_stream_filter_add((CamelStreamFilter *)decoded_stream, mf);
            gtk_object_unref((GtkObject *)mf);
        }

        camel_mime_part_construct_content_from_stream (mime_part, decoded_stream);
        
    }

    return parent_class->get_content_object (medium);
        
}


/* **** */




/**********************************************************************/
#ifdef WHPT
#warning : WHPT is already defined !!!!!!
#endif
#define WHPT gmime_write_header_pair_to_stream


static void
my_write_content_to_stream (CamelMimePart *mime_part, CamelStream *stream)
{
    CamelMedium *medium;
    CamelStream *wrapper_stream;
    CamelStream *stream_encode;
    CamelMimeFilter *mf = NULL;
    CamelDataWrapper *content;

    g_assert (mime_part);

    medium = CAMEL_MEDIUM (mime_part);
    content = medium->content;
    
    if (!content) {
        content = camel_medium_get_content_object (CAMEL_MEDIUM (mime_part));
        if (!content)
            return;
    }

    switch (mime_part->encoding) {
    case CAMEL_MIME_PART_ENCODING_DEFAULT:
    case CAMEL_MIME_PART_ENCODING_7BIT:
    case CAMEL_MIME_PART_ENCODING_8BIT:
        camel_data_wrapper_write_to_stream (content, stream);
        break;
    case CAMEL_MIME_PART_ENCODING_QUOTEDPRINTABLE:
        mf = (CamelMimeFilter *)camel_mime_filter_basic_new_type(CAMEL_MIME_FILTER_BASIC_QP_ENC);
        break;
    case CAMEL_MIME_PART_ENCODING_BASE64:
        mf = (CamelMimeFilter *)camel_mime_filter_basic_new_type(CAMEL_MIME_FILTER_BASIC_BASE64_ENC);
        break;
    default:
        camel_data_wrapper_write_to_stream (content, stream);
        g_warning ("Encoding type `%s' not supported.",
               camel_mime_part_encoding_to_string
               (mime_part->encoding));
    }

    if (mf) {
        /* encode the data wrapper output stream in the filtered encoding */
        wrapper_stream = camel_data_wrapper_get_output_stream (content);
        camel_stream_reset (wrapper_stream);
        stream_encode = (CamelStream *)camel_stream_filter_new_with_stream (wrapper_stream);
        camel_stream_filter_add((CamelStreamFilter *)stream_encode, mf);

        /*  ... and write it to the output stream in a blocking way */
        camel_stream_write_to_stream (stream_encode, stream);
        
        /* now free the intermediate b64 stream */
        gtk_object_unref (GTK_OBJECT (stream_encode));
        gtk_object_unref((GtkObject *)mf);
    }
}




/* FIXME: this is just totally broken broken broken broken */

static void
my_write_to_stream (CamelDataWrapper *data_wrapper, CamelStream *stream)
{
    CamelMimePart *mp = CAMEL_MIME_PART (data_wrapper);
    CamelMedium *medium = CAMEL_MEDIUM (data_wrapper);

    d(printf("mime_part::write_to_stream\n"));

#warning This class should NOT BE WRITING the headers out
    if (medium->headers) {
        struct _header_raw *h = medium->headers;
        while (h) {
            camel_stream_write_strings (stream, h->name, isspace(h->value[0])?":":": ", h->value, "\n", NULL);
            h = h->next;
        }
    }

    /* FIXME: something needs to be done about this ... */
    gmime_write_header_with_glist_to_stream (stream, "Content-Language", mp->content_languages,", ");

    camel_stream_write_string(stream,"\n");

#if 1
    {
        CamelDataWrapper *content = camel_medium_get_content_object (CAMEL_MEDIUM (data_wrapper));
        if (content) {
            camel_data_wrapper_write_to_stream(content, stream);
        } else {
            g_warning("No content for data wrapper");
        }
    }
#else
    ((CamelDataWrapperClass *)parent_class)->write_to_stream (data_wrapper, stream);
#endif
    /*my_write_content_to_stream (mp, stream);*/
}



static void
my_construct_from_stream (CamelDataWrapper *data_wrapper, CamelStream *stream)
{

    CamelMimePart *mime_part = CAMEL_MIME_PART (data_wrapper);
    
    camel_mime_part_construct_headers_from_stream (mime_part, stream);
    
    camel_mime_part_store_stream_in_buffer (mime_part, stream);
}


/* FIXME: this should be in another file ... */
/* This replaces the data wrapper repository ... and/or could be replaced by it? */
static void
camel_mime_part_construct_content(CamelDataWrapper *dw, CamelMimeParser *mp)
{
    CamelDataWrapper *content = NULL;
    int state;

    switch ((state = camel_mime_parser_state(mp))) {
    case HSCAN_HEADER:
        d(printf("Creating body part\n"));
        content = (CamelDataWrapper *)camel_simple_data_wrapper_new();
        break;
    case HSCAN_MESSAGE:
        d(printf("Creating message part\n"));
        content = (CamelDataWrapper *)camel_mime_message_new();
        break;
    case HSCAN_MULTIPART:
        d(printf("Creating multi-part\n"));
        content = (CamelDataWrapper *)camel_multipart_new();
        break;
    default:
        g_warning("Invalid state encountered???: %d", camel_mime_parser_state(mp));
    }
    if (content) {
        camel_data_wrapper_construct_from_parser(content, mp);
#warning there just has got to be a better way ... to transfer the mime-type to the datawrapper
        /* would you believe you have to set this BEFORE you set the content object???  oh my god !!!! */
        camel_data_wrapper_set_mime_type_field (content, 
                            camel_mime_part_get_content_type ((CamelMimePart *)dw));
        camel_medium_set_content_object((CamelMedium *)dw, content);
    }
    /* this should probably go into camel-mime-message::construct_from_parser */
    if (state == HSCAN_MESSAGE) {
        char *buf;
        int len;

        if (camel_mime_parser_step(mp, &buf, &len) != HSCAN_MESSAGE_END) {
            g_warning("Bad parser state: Expecing MESSAGE_EOF, got: %d", camel_mime_parser_state(mp));
            camel_mime_parser_unstep(mp);
        }
    }
}

/* mime_part */
static void
construct_from_parser(CamelDataWrapper *dw, CamelMimeParser *mp)
{
    struct _header_raw *headers;
    char *buf;
    int len;

    d(printf("constructing mime-part\n"));

    switch (camel_mime_parser_step(mp, &buf, &len)) {
    case HSCAN_HEADER:
    case HSCAN_MESSAGE:
    case HSCAN_MULTIPART:
        /* we have the headers, build them into 'us' */
        headers = camel_mime_parser_headers_raw(mp);
        while (headers) {
            camel_medium_add_header((CamelMedium *)dw, headers->name, headers->value);
            headers = headers->next;
        }
        camel_mime_part_construct_content(dw, mp);
        break;
    default:
        g_warning("Invalid state encountered???: %d", camel_mime_parser_state(mp));
    }
}

static void 
my_set_input_stream (CamelDataWrapper *data_wrapper, CamelStream *stream)
{
    CamelMimePart *mime_part = CAMEL_MIME_PART (data_wrapper);
    CamelSeekableStream *seekable_stream;
    guint32 content_stream_inf_bound;
    

    g_assert (CAMEL_IS_SEEKABLE_STREAM (stream));
    seekable_stream = CAMEL_SEEKABLE_STREAM (stream);

    /* call parent class implementation */
    CAMEL_DATA_WRAPPER_CLASS (parent_class)->set_input_stream (data_wrapper, stream);


    camel_mime_part_construct_headers_from_stream (mime_part, stream);
    
    /* set the input stream for the content object */
    content_stream_inf_bound = camel_seekable_stream_get_current_position (seekable_stream);
    
    if (mime_part->content_input_stream)
        gtk_object_unref (GTK_OBJECT (mime_part->content_input_stream));
    mime_part->content_input_stream = camel_seekable_substream_new_with_seekable_stream_and_bounds (seekable_stream,
                                                    content_stream_inf_bound, 
                                                    -1);
    gtk_object_ref (GTK_OBJECT (mime_part->content_input_stream));
    gtk_object_sink (GTK_OBJECT (mime_part->content_input_stream));
}


static CamelStream *
my_get_output_stream (CamelDataWrapper *data_wrapper)
{
    CamelMimePart *mime_part = CAMEL_MIME_PART (data_wrapper);
    CamelStream *input_stream;
    CamelStream *output_stream;
    /* ** FIXME : bogus bogus bogus - test test test */

    return NULL; 

    /* 
     * For the moment, we do not use this routine on 
     * mime parts. Maybe later.
     */
    input_stream = camel_data_wrapper_get_input_stream (data_wrapper);
    
    if (input_stream == NULL)
        return NULL;

    switch (mime_part->encoding) {
        
    case CAMEL_MIME_PART_ENCODING_DEFAULT:
    case CAMEL_MIME_PART_ENCODING_7BIT:
    case CAMEL_MIME_PART_ENCODING_8BIT:
        return input_stream;
        
    case CAMEL_MIME_PART_ENCODING_BASE64:
        return output_stream;

    case CAMEL_MIME_PART_ENCODING_QUOTEDPRINTABLE:
        return input_stream;
    default:
        break;
    }

    return NULL;
}


const gchar *
camel_mime_part_encoding_to_string (CamelMimePartEncodingType encoding)
{
    switch (encoding) {
    case CAMEL_MIME_PART_ENCODING_DEFAULT:
    case CAMEL_MIME_PART_ENCODING_7BIT:
        return "7bit";
    case CAMEL_MIME_PART_ENCODING_8BIT:
        return "8bit";
    case CAMEL_MIME_PART_ENCODING_BASE64:
        return "base64";
    case CAMEL_MIME_PART_ENCODING_QUOTEDPRINTABLE:
        return "quoted-printable";
    default:
        break;
    }
    return "";
}



/* FIXME I am not sure this is the correct way to do this.  */
CamelMimePartEncodingType
camel_mime_part_encoding_from_string (const gchar *string)
{
    if (string == NULL)
        return CAMEL_MIME_PART_ENCODING_DEFAULT;
    else if (strcasecmp (string, "7bit") == 0)
        return CAMEL_MIME_PART_ENCODING_7BIT;
    else if (strcasecmp (string, "8bit") == 0)
        return CAMEL_MIME_PART_ENCODING_8BIT;
    else if (strcasecmp (string, "base64") == 0)
        return CAMEL_MIME_PART_ENCODING_BASE64;
    else if (strcasecmp (string, "quoted-printable") == 0)
        return CAMEL_MIME_PART_ENCODING_QUOTEDPRINTABLE;
    else
        /* FIXME?  Spit a warning?  */
        return CAMEL_MIME_PART_ENCODING_DEFAULT;
}


/******************************/
/**  Misc utility functions  **/


/**
 * camel_mime_part_set_text: set the content to be some text
 * @camel_mime_part: Mime part 
 * @text: the text
 * 
 * Utility function used to set the content of a mime part object to 
 * be a text string. When @text is NULL, this routine can be used as
 * a way to remove old text content.
 * 
 **/
void 
camel_mime_part_set_text (CamelMimePart *camel_mime_part, const gchar *text)
{
    CamelSimpleDataWrapper *simple_data_wrapper;
    CamelMedium *medium = CAMEL_MEDIUM (camel_mime_part);

    if (medium->content)
        gtk_object_unref (GTK_OBJECT (medium->content));
    if (text) {
        simple_data_wrapper = camel_simple_data_wrapper_new ();
        camel_data_wrapper_set_mime_type (CAMEL_DATA_WRAPPER (simple_data_wrapper), "text/plain");
        camel_simple_data_wrapper_set_text ( simple_data_wrapper, text);
        camel_medium_set_content_object ( CAMEL_MEDIUM (camel_mime_part), CAMEL_DATA_WRAPPER (simple_data_wrapper));
        gtk_object_unref (GTK_OBJECT (simple_data_wrapper));
    } else medium->content = NULL;
}