Refactored codecs to match ZMTP version numbers

src/v2_decoder.cpp

@@ -0,0 +1,160 @@
+/*
+    Copyright (c) 2007-2013 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 <stdlib.h>
+#include <string.h>
+
+#include "platform.hpp"
+#ifdef ZMQ_HAVE_WINDOWS
+#include "windows.hpp"
+#endif
+
+#include "v2_protocol.hpp"
+#include "v2_decoder.hpp"
+#include "likely.hpp"
+#include "wire.hpp"
+#include "err.hpp"
+
+zmq::v2_decoder_t::v2_decoder_t (size_t bufsize_,
+      int64_t maxmsgsize_, i_msg_sink *msg_sink_) :
+    decoder_base_t <v2_decoder_t> (bufsize_),
+    msg_sink (msg_sink_),
+    msg_flags (0),
+    maxmsgsize (maxmsgsize_)
+{
+    int rc = in_progress.init ();
+    errno_assert (rc == 0);
+
+    //  At the beginning, read one byte and go to flags_ready state.
+    next_step (tmpbuf, 1, &v2_decoder_t::flags_ready);
+}
+
+zmq::v2_decoder_t::~v2_decoder_t ()
+{
+    int rc = in_progress.close ();
+    errno_assert (rc == 0);
+}
+
+void zmq::v2_decoder_t::set_msg_sink (i_msg_sink *msg_sink_)
+{
+    msg_sink = msg_sink_;
+}
+
+bool zmq::v2_decoder_t::flags_ready ()
+{
+    msg_flags = 0;
+    if (tmpbuf [0] & v2_protocol_t::more_flag)
+        msg_flags |= msg_t::more;
+
+    //  The payload length is either one or eight bytes,
+    //  depending on whether the 'large' bit is set.
+    if (tmpbuf [0] & v2_protocol_t::large_flag)
+        next_step (tmpbuf, 8, &v2_decoder_t::eight_byte_size_ready);
+    else
+        next_step (tmpbuf, 1, &v2_decoder_t::one_byte_size_ready);
+
+    return true;
+}
+
+bool zmq::v2_decoder_t::one_byte_size_ready ()
+{
+    int rc = 0;
+
+    //  Message size must not exceed the maximum allowed size.
+    if (maxmsgsize >= 0)
+        if (unlikely (tmpbuf [0] > static_cast <uint64_t> (maxmsgsize)))
+            goto error;
+
+    //  in_progress is initialised at this point so in theory we should
+    //  close it before calling zmq_msg_init_size, however, it's a 0-byte
+    //  message and thus we can treat it as uninitialised...
+    rc = in_progress.init_size (tmpbuf [0]);
+    if (unlikely (rc)) {
+        errno_assert (errno == ENOMEM);
+        int rc = in_progress.init ();
+        errno_assert (rc == 0);
+        goto error;
+    }
+
+    in_progress.set_flags (msg_flags);
+    next_step (in_progress.data (), in_progress.size (),
+        &v2_decoder_t::message_ready);
+
+    return true;
+
+error:
+    decoding_error ();
+    return false;
+}
+
+bool zmq::v2_decoder_t::eight_byte_size_ready ()
+{
+    int rc = 0;
+
+    //  The payload size is encoded as 64-bit unsigned integer.
+    //  The most significant byte comes first.
+    const uint64_t msg_size = get_uint64 (tmpbuf);
+
+    //  Message size must not exceed the maximum allowed size.
+    if (maxmsgsize >= 0)
+        if (unlikely (msg_size > static_cast <uint64_t> (maxmsgsize)))
+            goto error;
+
+    //  Message size must fit into size_t data type.
+    if (unlikely (msg_size != static_cast <size_t> (msg_size)))
+        goto error;
+
+    //  in_progress is initialised at this point so in theory we should
+    //  close it before calling init_size, however, it's a 0-byte
+    //  message and thus we can treat it as uninitialised.
+    rc = in_progress.init_size (static_cast <size_t> (msg_size));
+    if (unlikely (rc)) {
+        errno_assert (errno == ENOMEM);
+        int rc = in_progress.init ();
+        errno_assert (rc == 0);
+        goto error;
+    }
+
+    in_progress.set_flags (msg_flags);
+    next_step (in_progress.data (), in_progress.size (),
+        &v2_decoder_t::message_ready);
+
+    return true;
+
+error:
+    decoding_error ();
+    return false;
+}
+
+bool zmq::v2_decoder_t::message_ready ()
+{
+    //  Message is completely read. Push it further and start reading
+    //  new message. (in_progress is a 0-byte message after this point.)
+    if (unlikely (!msg_sink))
+        return false;
+    int rc = msg_sink->push_msg (&in_progress);
+    if (unlikely (rc != 0)) {
+        if (errno != EAGAIN)
+            decoding_error ();
+        return false;
+    }
+
+    next_step (tmpbuf, 1, &v2_decoder_t::flags_ready);
+    return true;
+}