src/mime.h


/*
  Gaim

  Gaim is the legal property of its developers, whose names are too
  numerous to list here. Please refer to the COPYRIGHT file distributed
  with this source distribution
  
  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.
*/

#ifndef _GAIM_MIME_H
#define _GAIM_MIME_H


#include <glib.h>
#include <glib/glist.h>


/**
   @file mime.h
   @ingroup core
   
   Rudimentary parsing of multi-part MIME messages into more
   accessible structures.
*/


/** @typedef GaimMimeDocument
    A MIME document
 */
typedef struct _GaimMimeDocument GaimMimeDocument;


/** @typedef GaimMimePart
    A part of a multipart MIME document
 */
typedef struct _GaimMimePart GaimMimePart;


/** Allocate an empty MIME document */
GaimMimeDocument *gaim_mime_document_new(void);


/** Frees memory used in a MIME document and all of its parts and fields
    @param doc   the MIME document to free
 */
void gaim_mime_document_free(GaimMimeDocument *doc);


/** Parse a MIME document from a NUL-terminated string
    @param buf  the NULL-terminated string containing the MIME-encoded data
    @returns MIME document
 */
GaimMimeDocument *gaim_mime_document_parse(const char *buf);


/** Parse a MIME document from a string
    @param buf  the string containing the MIME-encoded data
    @param len  length of buf
    @returns MIME document
 */
GaimMimeDocument *gaim_mime_document_parsen(const char *buf, gsize len);


/** Write (append) a MIME document onto a GString */
void gaim_mime_document_write(GaimMimeDocument *doc, GString *str);


/** The list of fields in the header of a document

    @param doc  the MIME document
    @returns    list of strings indicating the fields (but not the values of
                the fields) in the header of doc
*/
const GList *gaim_mime_document_get_fields(GaimMimeDocument *doc);


/** Get the value of a specific field in the header of a document

    @param doc    the MIME document
    @param field  case-insensitive field name
    @returns      value associated with the indicated header field, or
                  NULL if the field doesn't exist
*/
const char *gaim_mime_document_get_field(GaimMimeDocument *doc,
					 const char *field);


/** Set or replace the value of a specific field in the header of a
    document

    @param doc    the MIME document
    @param field  case-insensitive field name
    @param value  value to associate with the indicated header field,
                  of NULL to remove the field
*/
void gaim_mime_document_set_field(GaimMimeDocument *doc,
				  const char *field,
				  const char *value);


/** The list of parts in a multipart document

    @param doc   the MIME document
    @returns     list of GaimMimePart contained within doc
*/
const GList *gaim_mime_document_get_parts(GaimMimeDocument *doc);


/** Create and insert a new part into a MIME document

    @param doc   the new part's parent MIME document
 */
GaimMimePart *gaim_mime_part_new(GaimMimeDocument *doc);


/** The list of fields in the header of a document part

    @param part  the MIME document part
    @returns  list of strings indicating the fields (but not the values
              of the fields) in the header of part
*/
const GList *gaim_mime_part_get_fields(GaimMimePart *part);


/** Get the value of a specific field in the header of a document part

    @param part   the MIME document part
    @param field  case-insensitive name of the header field
    @returns      value of the specified header field, or NULL if the
                  field doesn't exist
*/
const char *gaim_mime_part_get_field(GaimMimePart *part,
				     const char *field);


/** Get the decoded value of a specific field in the header of a
    document part */
char *gaim_mime_part_get_field_decoded(GaimMimePart *part,
				       const char *field);


/** Set or replace the value of a specific field in the header of a
    document
    @param part   the part of the MIME document
    @param field  case-insensitive field name
    @param value  value to associate with the indicated header field,
                  of NULL to remove the field
*/
void gaim_mime_part_set_field(GaimMimePart *part,
			      const char *field,
			      const char *value);


/** Get the (possibly encoded) data portion of a MIME document part
    @param part   the MIME document part
    @returns      NULL-terminated data found in the document part
 */
const char *gaim_mime_part_get_data(GaimMimePart *part);


/** Get the data portion of a MIME document part, after attempting to
    decode it according to the content-transfer-encoding field. If the
    specified encoding method is not supported, this function will
    return NULL.

    @param part the MIME documemt part
    @param data Buffer for the data
    @param len  The length of the buffer
*/
void gaim_mime_part_get_data_decoded(GaimMimePart *part,
				     guchar **data, gsize *len);


/** Get the length of the data portion of a MIME document part

    @param part  the MIME document part
    @returns     length of the data in the document part
*/
gsize gaim_mime_part_get_length(GaimMimePart *part);


void gaim_mime_part_set_data(GaimMimePart *part, const char *data);


#endif