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Message
#include <mailutils/message.h>
/* Prefix message_ is reserve */
The message_t object is a convenient way to manipulate messages.  It
encapsulates the envelope_t, the header_t and the body_t.
    mailbox_t
    __________                   message_t
   (message[1])        +------>+-----------------------+
    ----------         |       |  envelope_t           |
   (message[2])        |       |-----------------------|
    ----------         |       |  header_t             |
   (message[3])--------+       |-----------------------|
    ----------                 |  body_t               |
   (message[n])                |-----------------------|
    ----------                 |  attribute_t          |
                               |-----------------------|
                               |  stream_t             |
                               +-----------------------+
| void message_create (message_t *msg, void *owner) | Function | 
| void message_destroy (message_t *msg, void *owner) | Function | 
| The resources allocate for msg are freed. | 
| int message_get_header (message_t msg, header_t *pheader) | Function | 
| int message_set_header (message_t msg, header_t header, void *owner) | Function | 
| int message_get_body (message_t msg, body_t *pbody) | Function | 
| int message_set_body (message_t msg, body_t body, void *owner) | Function | 
| int message_is_multipart (message_t msg, int *pmulti) | Function | 
| Set *pmulti to non-zero value if msg is multi-part. | 
| int message_get_num_parts (message_t msg, size_t *nparts) | Function | 
| int message_get_part (message_t msg, size_t part, message_t *msg) | Function | 
| int message_get_stream (message_t msg, stream_t *pstream) | Function | 
| int message_set_stream (message_t msg, stream_t stream,void *owner ) | Function | 
| int message_get_attribute (message_t msg, attribute_t *pattribute) | Function | 
| int message_set_attribute (message_t msg, attribute_t attribute, void *owner) | Function | 
| int message_get_envelope (message_t msg, envelope_t *penvelope) | Function | 
| int message_set_envelope (message_t msg, envelope_t envelope, void *owner) | Function | 
| int message_get_uid (message_t msg, size_t *uid) | Function | 
| int message_get_uidl (message_t msg, char *buffer, size_t buflen, size_t *pwriten) | Function | 
| int message_set_uidl (message_t msg, int (*_get_uidl)(message_t, char *, size_t, size_t *), void *owner) | Function | 
| int message_get_observable (message_t msg, observable_t *observable) | Function | 
| int message_create_attachment (const char *content_type, const char *encoding, const char *filename, message_t *newmsg) | Function | 
| int message_save_attachment (message_t msg, const char *filename, void **data) | Function | 
| int message_encapsulate (message_t msg, message_t *newmsg, void **data) | Function | 
| int message_unencapsulate (message_t msg, message_t *newmsg, void **data); | Function |