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/*
Copyright (c) 2012-2013 Martin Sustrik All rights reserved.
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom
the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
IN THE SOFTWARE.
*/
#ifndef NN_MSG_INCLUDED
#define NN_MSG_INCLUDED
#include "chunkref.h"
#include <stddef.h>
struct nn_msg {
/* Contains SP message header. This field directly corresponds
to SP message header as defined in SP RFCs. There's no leading
cmsghdr or trailing padding. */
struct nn_chunkref sphdr;
/* Contains any additional transport-level message headers. Format of this
buffer is a list of cmsgs as defined by POSIX (see "ancillary data"). */
struct nn_chunkref hdrs;
/* Contains application level message payload. */
struct nn_chunkref body;
};
/* Initialises a message with body 'size' bytes long and empty header. */
void nn_msg_init (struct nn_msg *self, size_t size);
/* Initialise message with body provided in the form of chunk pointer. */
void nn_msg_init_chunk (struct nn_msg *self, void *chunk);
/* Frees resources allocate with the message. */
void nn_msg_term (struct nn_msg *self);
/* Moves the content of the message from src to dst. dst should not be
initialised prior to the operation. dst will be uninitialised after the
operation. */
void nn_msg_mv (struct nn_msg *dst, struct nn_msg *src);
/* Copies a message from src to dst. dst should not be
initialised prior to the operation. */
void nn_msg_cp (struct nn_msg *dst, struct nn_msg *src);
/* Bulk copying is done by first invoking nn_msg_bulkcopy_start on the source
message and specifying how many copies of the message will be made. Then,
nn_msg_bulkcopy_cp should be used 'copies' of times to make individual
copies of the source message. Note: Bulk copying is more efficient than
making each copy separately. */
void nn_msg_bulkcopy_start (struct nn_msg *self, uint32_t copies);
void nn_msg_bulkcopy_cp (struct nn_msg *dst, struct nn_msg *src);
/** Replaces the message body with entirely new data. This allows protocols
that substantially rewrite or preprocess the userland message to be written. */
void nn_msg_replace_body(struct nn_msg *self, struct nn_chunkref newBody);
#endif