1 files changed, 159 insertions, 0 deletions
diff --git a/src/msg.cpp b/src/msg.cpp
new file mode 100644
index 0000000..e9d1da7
--- /dev/null
+++ b/src/msg.cpp
@@ -0,0 +1,159 @@
+/*
+    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;
+}