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


/* 
 *
 * Author : 
 *  Bertrand Guiheneuf <bertrand@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 "gmime-base64.h"
#include "camel-seekable-substream.h"
#include "camel-stream-b64.h"


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)

/* 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            my_set_input_stream             (CamelDataWrapper *data_wrapper, 
                            CamelStream *stream);
static CamelStream *   my_get_output_stream            (CamelDataWrapper *data_wrapper);


/* from CamelMedia */ 
static void            my_add_header                   (CamelMedium *medium, 
                            gchar *header_name, 
                            gchar *header_value);

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



/* from CamelMimePart */
static void            my_set_description              (CamelMimePart *mime_part, 
                            const gchar *description);
static const gchar *   my_get_description              (CamelMimePart *mime_part);
static void            my_set_disposition              (CamelMimePart *mime_part, 
                            const gchar *disposition);
static const gchar *   my_get_disposition              (CamelMimePart *mime_part);
static void            my_set_filename                 (CamelMimePart *mime_part, 
                            gchar *filename);
static const gchar *   my_get_filename                 (CamelMimePart *mime_part);
static void            my_set_content_id               (CamelMimePart *mime_part, 
                            gchar *content_id);
static const gchar *   my_get_content_id               (CamelMimePart *mime_part);
static void            my_set_content_MD5              (CamelMimePart *mime_part, 
                            gchar *content_MD5);
static const gchar *   my_get_content_MD5              (CamelMimePart *mime_part);
static void            my_set_encoding                 (CamelMimePart *mime_part, 
                            CamelMimePartEncodingType encoding);
static CamelMimePartEncodingType my_get_encoding       (CamelMimePart *mime_part);
static void            my_set_content_languages        (CamelMimePart *mime_part, 
                            GList *content_languages);
static const GList *   my_get_content_languages        (CamelMimePart *mime_part);
static void            my_set_header_lines             (CamelMimePart *mime_part, 
                            GList *header_lines);
static const GList *   my_get_header_lines             (CamelMimePart *mime_part);
static void            my_set_content_type             (CamelMimePart *mime_part, 
                            const gchar *content_type);
static GMimeContentField  *my_get_content_type         (CamelMimePart *mime_part);

static gboolean        my_parse_header_pair            (CamelMimePart *mime_part, 
                            gchar *header_name, 
                            gchar *header_value);



/* 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 definition */
    camel_mime_part_class->set_description        = my_set_description;
    camel_mime_part_class->get_description        = my_get_description;
    camel_mime_part_class->set_disposition        = my_set_disposition;
    camel_mime_part_class->get_disposition        = my_get_disposition;
    camel_mime_part_class->set_filename           = my_set_filename;
    camel_mime_part_class->get_filename           = my_get_filename;
    camel_mime_part_class->set_content_id         = my_set_content_id;
    camel_mime_part_class->get_content_id         = my_get_content_id;
    camel_mime_part_class->set_content_MD5        = my_set_content_MD5;
    camel_mime_part_class->get_content_MD5        = my_get_content_MD5;
    camel_mime_part_class->set_encoding           = my_set_encoding;
    camel_mime_part_class->get_encoding           = my_get_encoding;
    camel_mime_part_class->set_content_languages  = my_set_content_languages;
    camel_mime_part_class->get_content_languages  = my_get_content_languages;
    camel_mime_part_class->set_header_lines       = my_set_header_lines;
    camel_mime_part_class->get_header_lines       = my_get_header_lines;
    camel_mime_part_class->set_content_type       = my_set_content_type;
    camel_mime_part_class->get_content_type       = my_get_content_type;
    
    camel_mime_part_class->parse_header_pair      = my_parse_header_pair;

    /* virtual method overload */   
    camel_medium_class->add_header                = my_add_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->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 (NULL, NULL);
    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->filename             = NULL;
    camel_mime_part->header_lines         = NULL;

    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);

#warning do something for (mime_part->disposition) which should not be a GMimeContentField

    g_free (mime_part->description);
    g_free (mime_part->content_id);
    g_free (mime_part->content_MD5);
    string_list_free (mime_part->content_languages);
    g_free (mime_part->filename);
    if (mime_part->header_lines) string_list_free (mime_part->header_lines);
    
    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 void
my_add_header (CamelMedium *medium, gchar *header_name, gchar *header_value)
{
    CamelMimePart *mime_part = CAMEL_MIME_PART (medium);
    
    /* 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                      */
    if (! CMP_CLASS(mime_part)->parse_header_pair (mime_part, header_name, header_value) )      
        parent_class->add_header (medium, header_name, header_value);
}






static void
my_set_description (CamelMimePart *mime_part, const gchar *description)
{
    g_free (mime_part->description);
    mime_part->description = g_strdup (description);
}

void
camel_mime_part_set_description (CamelMimePart *mime_part, const gchar *description)
{
    CMP_CLASS(mime_part)->set_description (mime_part, description);
}



/* **** */



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

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



/* **** */


static void
my_set_disposition (CamelMimePart *mime_part, const gchar *disposition)
{
#warning Do not use MimeContentfield here !!!
    
    if (mime_part->disposition) {
        g_free (mime_part->disposition->type);
        g_free (mime_part->disposition);
    }
    
    mime_part->disposition = g_new0 (GMimeContentField,1);
    mime_part->disposition->type = g_strdup (disposition);
}


void
camel_mime_part_set_disposition (CamelMimePart *mime_part, const gchar *disposition)
{
    CMP_CLASS(mime_part)->set_disposition (mime_part, disposition);
}


/* **** */



static const gchar *
my_get_disposition (CamelMimePart *mime_part)
{
    if (!mime_part->disposition) return NULL;
    return (mime_part->disposition)->type;
}


const gchar *
camel_mime_part_get_disposition (CamelMimePart *mime_part)
{
    return CMP_CLASS(mime_part)->get_disposition (mime_part);
}



static void
my_set_filename (CamelMimePart *mime_part, gchar *filename)
{
    g_free(mime_part->filename);
    mime_part->filename = filename;
}


void
camel_mime_part_set_filename (CamelMimePart *mime_part, gchar *filename)
{
    CMP_CLASS(mime_part)->set_filename (mime_part, filename);
}



/* **** */


static const gchar *
my_get_filename (CamelMimePart *mime_part)
{
    return mime_part->filename;
}


const gchar *
camel_mime_part_get_filename (CamelMimePart *mime_part)
{
    return CMP_CLASS(mime_part)->get_filename (mime_part);
}


/* **** */


/* this routine must not be public */
static void
my_set_content_id (CamelMimePart *mime_part, gchar *content_id)
{
    g_free(mime_part->content_id);
    mime_part->content_id = g_strdup(content_id);
}


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


/* **** */


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


/* this routine must not be public */
static void
my_set_content_MD5 (CamelMimePart *mime_part, gchar *content_MD5)
{
    g_free(mime_part->content_MD5);
    mime_part->content_MD5 = content_MD5;
}


/* **** */


static const gchar *
my_get_content_MD5 (CamelMimePart *mime_part)
{
    return mime_part->content_MD5;
}

const gchar *
camel_mime_part_get_content_MD5 (CamelMimePart *mime_part)
{
    return CMP_CLASS(mime_part)->get_content_MD5 (mime_part);
}


/* **** */



static void
my_set_encoding (CamelMimePart *mime_part, CamelMimePartEncodingType encoding)
{
    mime_part->encoding = encoding;
}

void
camel_mime_part_set_encoding (CamelMimePart *mime_part,
                  CamelMimePartEncodingType encoding)
{
    CMP_CLASS(mime_part)->set_encoding (mime_part, encoding);
}


/* **** */



static CamelMimePartEncodingType
my_get_encoding (CamelMimePart *mime_part)
{
    return mime_part->encoding;
}

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



/* **** */



static void
my_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;
}

void
camel_mime_part_set_content_languages (CamelMimePart *mime_part, GList *content_languages)
{
    CMP_CLASS(mime_part)->set_content_languages (mime_part, content_languages);
}


/* **** */



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


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


/* **** */



static void
my_set_header_lines (CamelMimePart *mime_part, GList *header_lines)
{
    if (mime_part->header_lines) string_list_free (mime_part->header_lines);
    mime_part->header_lines = header_lines;
}

void
camel_mime_part_set_header_lines (CamelMimePart *mime_part, GList *header_lines)
{
    CMP_CLASS(mime_part)->set_header_lines (mime_part, header_lines);
}


/* **** */



static const GList *
my_get_header_lines (CamelMimePart *mime_part)
{
    return mime_part->header_lines;
}



const GList *
camel_mime_part_get_header_lines (CamelMimePart *mime_part)
{
    return CMP_CLASS(mime_part)->get_header_lines (mime_part);
}


/* **** */



static void
my_set_content_type (CamelMimePart *mime_part, const gchar *content_type)
{
    g_assert (content_type);
    gmime_content_field_construct_from_string (mime_part->content_type, content_type);
}

void 
camel_mime_part_set_content_type (CamelMimePart *mime_part, gchar *content_type)
{
    CMP_CLASS(mime_part)->set_content_type (mime_part, content_type);
}

/* **** */


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

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

/*********/



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)) 
        gmime_content_field_unref (mime_part->content_type);
    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;

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

        switch (mime_part->encoding) {
        
        case CAMEL_MIME_PART_ENCODING_DEFAULT:
        case CAMEL_MIME_PART_ENCODING_7BIT:
        case CAMEL_MIME_PART_ENCODING_8BIT:
        case CAMEL_MIME_PART_ENCODING_QUOTEDPRINTABLE:
            break;

        case CAMEL_MIME_PART_ENCODING_BASE64:
            decoded_stream = camel_stream_b64_new_with_input_stream (stream);
            camel_stream_b64_set_mode (CAMEL_STREAM_B64 (decoded_stream), 
                           CAMEL_STREAM_B64_DECODER);
            break;
        }

        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;
    CamelStreamB64 *stream_b64;

    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_BASE64:
        /* encode the data wrapper output stream in base 64 ... */
        wrapper_stream = camel_data_wrapper_get_output_stream (content);
        camel_stream_reset (wrapper_stream);
        stream_b64 = CAMEL_STREAM_B64 (camel_stream_b64_new_with_input_stream (wrapper_stream));
        camel_stream_b64_set_mode (stream_b64, CAMEL_STREAM_B64_ENCODER);
        
        /*  ... and write it to the output stream in a blocking way */
        camel_stream_b64_write_to_stream (stream_b64, stream);
        
        /* now free the intermediate b64 stream */
        gtk_object_unref (GTK_OBJECT (stream_b64));
        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));
    }
}





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

    gmime_content_field_write_to_stream(mp->disposition, stream);
    WHPT (stream, "Content-Transfer-Encoding",
          camel_mime_part_encoding_to_string (mp->encoding));
    WHPT (stream, "Content-Description", mp->description);
    WHPT (stream, "Content-MD5", mp->content_MD5);
    WHPT (stream, "Content-id", mp->content_id);
    gmime_write_header_with_glist_to_stream (stream, "Content-Language", mp->content_languages,", ");
    gmime_write_header_table_to_stream (stream, medium->headers);
    gmime_content_field_write_to_stream (mp->content_type, stream);
    
    camel_stream_write_string(stream,"\n");
    my_write_content_to_stream (mp, stream);
}



/*******************************/
/* mime part parsing           */

static gboolean
my_parse_header_pair (CamelMimePart *mime_part, gchar *header_name, gchar *header_value)
{
    CamelHeaderType header_type;
    gboolean header_handled = FALSE;
    
    
    header_type = (CamelHeaderType) g_hash_table_lookup (header_name_table, header_name);
    switch (header_type) {
        
    case HEADER_DESCRIPTION:
        camel_mime_part_set_description (mime_part, header_value);
        header_handled = TRUE;
        break;
        
    case HEADER_DISPOSITION:
        camel_mime_part_set_disposition (mime_part, header_value);
        header_handled = TRUE;
        break;
        
    case HEADER_CONTENT_ID:
        CMP_CLASS(mime_part)->set_content_id (mime_part, header_value);
        header_handled = TRUE;
        break;
        
    case HEADER_ENCODING:
        camel_mime_part_set_encoding
            (mime_part,
             camel_mime_part_encoding_from_string (header_value));
        header_handled = TRUE;
        break;
        
    case HEADER_CONTENT_MD5:
        CMP_CLASS(mime_part)->set_content_MD5 (mime_part, header_value);        
        header_handled = TRUE;
        break;
        
    case HEADER_CONTENT_TYPE: 
        gmime_content_field_construct_from_string (mime_part->content_type, header_value);
        header_handled = TRUE;
        break;
        
        
    }
    
    
    if (header_handled) {
        return TRUE;
    } else return FALSE;
    
}




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);
}




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);
        
}


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:
        output_stream = camel_stream_b64_new_with_input_stream (input_stream);
        camel_stream_b64_set_mode (CAMEL_STREAM_B64 (output_stream), 
                       CAMEL_STREAM_B64_ENCODER);
        return output_stream;

    case CAMEL_MIME_PART_ENCODING_QUOTEDPRINTABLE:
        return input_stream;
    }

    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";
    }
    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 (strcmp (string, "7bit") == 0)
        return CAMEL_MIME_PART_ENCODING_7BIT;
    else if (strcmp (string, "8bit") == 0)
        return CAMEL_MIME_PART_ENCODING_8BIT;
    else if (strcmp (string, "base64") == 0)
        return CAMEL_MIME_PART_ENCODING_BASE64;
    else if (strcmp (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;
}