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/*
Copyright (c) 2007-2011 iMatix Corporation
Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
This file is part of 0MQ.
0MQ is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
0MQ 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "msg.hpp"
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include <new>
#include "stdint.hpp"
#include "err.hpp"
int zmq_msg_init (zmq_msg_t *msg_)
{
msg_->content = (zmq::msg_content_t*) ZMQ_VSM;
msg_->flags = 0;
msg_->vsm_size = 0;
return 0;
}
int zmq_msg_init_size (zmq_msg_t *msg_, size_t size_)
{
if (size_ <= ZMQ_MAX_VSM_SIZE) {
msg_->content = (zmq::msg_content_t*) ZMQ_VSM;
msg_->flags = 0;
msg_->vsm_size = (uint8_t) size_;
}
else {
msg_->content =
(zmq::msg_content_t*) malloc (sizeof (zmq::msg_content_t) + size_);
if (!msg_->content) {
errno = ENOMEM;
return -1;
}
msg_->flags = 0;
zmq::msg_content_t *content = (zmq::msg_content_t*) msg_->content;
content->data = (void*) (content + 1);
content->size = size_;
content->ffn = NULL;
content->hint = NULL;
new (&content->refcnt) zmq::atomic_counter_t ();
}
return 0;
}
int zmq_msg_init_data (zmq_msg_t *msg_, void *data_, size_t size_,
zmq_free_fn *ffn_, void *hint_)
{
msg_->content = (zmq::msg_content_t*) malloc (sizeof (zmq::msg_content_t));
alloc_assert (msg_->content);
msg_->flags = 0;
zmq::msg_content_t *content = (zmq::msg_content_t*) msg_->content;
content->data = data_;
content->size = size_;
content->ffn = ffn_;
content->hint = hint_;
new (&content->refcnt) zmq::atomic_counter_t ();
return 0;
}
int zmq_msg_close (zmq_msg_t *msg_)
{
// For VSMs and delimiters there are no resources to free.
if (msg_->content != (zmq::msg_content_t*) ZMQ_DELIMITER &&
msg_->content != (zmq::msg_content_t*) ZMQ_VSM) {
// If the content is not shared, or if it is shared and the reference.
// count has dropped to zero, deallocate it.
zmq::msg_content_t *content = (zmq::msg_content_t*) msg_->content;
if (!(msg_->flags & ZMQ_MSG_SHARED) || !content->refcnt.sub (1)) {
// We used "placement new" operator to initialize the reference.
// counter so we call its destructor now.
content->refcnt.~atomic_counter_t ();
if (content->ffn)
content->ffn (content->data, content->hint);
free (content);
}
}
// As a safety measure, let's make the deallocated message look like
// an empty message.
msg_->content = (zmq::msg_content_t*) ZMQ_VSM;
msg_->flags = 0;
msg_->vsm_size = 0;
return 0;
}
int zmq_msg_move (zmq_msg_t *dest_, zmq_msg_t *src_)
{
zmq_msg_close (dest_);
*dest_ = *src_;
zmq_msg_init (src_);
return 0;
}
int zmq_msg_copy (zmq_msg_t *dest_, zmq_msg_t *src_)
{
zmq_msg_close (dest_);
// VSMs and delimiters require no special handling.
if (src_->content != (zmq::msg_content_t*) ZMQ_DELIMITER &&
src_->content != (zmq::msg_content_t*) ZMQ_VSM) {
// One reference is added to shared messages. Non-shared messages
// are turned into shared messages and reference count is set to 2.
zmq::msg_content_t *content = (zmq::msg_content_t*) src_->content;
if (src_->flags & ZMQ_MSG_SHARED)
content->refcnt.add (1);
else {
src_->flags |= ZMQ_MSG_SHARED;
content->refcnt.set (2);
}
}
*dest_ = *src_;
return 0;
}
void *zmq_msg_data (zmq_msg_t *msg_)
{
if (msg_->content == (zmq::msg_content_t*) ZMQ_VSM)
return msg_->vsm_data;
if (msg_->content == (zmq::msg_content_t*) ZMQ_DELIMITER)
return NULL;
return ((zmq::msg_content_t*) msg_->content)->data;
}
size_t zmq_msg_size (zmq_msg_t *msg_)
{
if (msg_->content == (zmq::msg_content_t*) ZMQ_VSM)
return msg_->vsm_size;
if (msg_->content == (zmq::msg_content_t*) ZMQ_DELIMITER)
return 0;
return ((zmq::msg_content_t*) msg_->content)->size;
}
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