1 files changed, 124 insertions, 0 deletions
diff --git a/src/decoder.cpp b/src/decoder.cpp
new file mode 100644
index 0000000..1217193
--- /dev/null
+++ b/src/decoder.cpp
@@ -0,0 +1,124 @@
+/*
+    Copyright (c) 2007-2010 iMatix Corporation
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the Lesser GNU 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
+    Lesser GNU General Public License for more details.
+
+    You should have received a copy of the Lesser GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "decoder.hpp"
+#include "i_inout.hpp"
+#include "wire.hpp"
+#include "err.hpp"
+
+zmq::decoder_t::decoder_t (size_t bufsize_) :
+    decoder_base_t <decoder_t> (bufsize_),
+    destination (NULL)
+{
+    zmq_msg_init (&in_progress);
+
+    //  At the beginning, read one byte and go to one_byte_size_ready state.
+    next_step (tmpbuf, 1, &decoder_t::one_byte_size_ready);
+}
+
+zmq::decoder_t::~decoder_t ()
+{
+    zmq_msg_close (&in_progress);
+}
+
+void zmq::decoder_t::set_inout (i_inout *destination_)
+{
+    destination = destination_;
+}
+
+bool zmq::decoder_t::one_byte_size_ready ()
+{
+    //  First byte of size is read. If it is 0xff read 8-byte size.
+    //  Otherwise allocate the buffer for message data and read the
+    //  message data into it.
+    if (*tmpbuf == 0xff)
+        next_step (tmpbuf, 8, &decoder_t::eight_byte_size_ready);
+    else {
+
+        //  There has to be at least one byte (the flags) in the message).
+        if (!*tmpbuf) {
+            decoding_error ();
+            return false;
+        }
+
+        //  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...
+        int rc = zmq_msg_init_size (&in_progress, *tmpbuf - 1);
+        if (rc != 0 && errno == ENOMEM) {
+            decoding_error ();
+            return false;
+        }
+        errno_assert (rc == 0);
+
+        next_step (tmpbuf, 1, &decoder_t::flags_ready);
+    }
+    return true;
+}
+
+bool zmq::decoder_t::eight_byte_size_ready ()
+{
+    //  8-byte size is read. Allocate the buffer for message body and
+    //  read the message data into it.
+    size_t size = (size_t) get_uint64 (tmpbuf);
+
+    //  There has to be at least one byte (the flags) in the message).
+    if (!size) {
+        decoding_error ();
+        return false;
+    }
+
+    //  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...
+    int rc = zmq_msg_init_size (&in_progress, size - 1);
+    if (rc != 0 && errno == ENOMEM) {
+        decoding_error ();
+        return false;
+    }
+    errno_assert (rc == 0);
+
+    next_step (tmpbuf, 1, &decoder_t::flags_ready);
+    return true;
+}
+
+bool zmq::decoder_t::flags_ready ()
+{
+    //  Store the flags from the wire into the message structure.
+    in_progress.flags = tmpbuf [0];
+
+    next_step (zmq_msg_data (&in_progress), zmq_msg_size (&in_progress),
+        &decoder_t::message_ready);
+    
+    return true;
+}
+
+bool zmq::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 (!destination || !destination->write (&in_progress))
+        return false;
+
+    next_step (tmpbuf, 1, &decoder_t::one_byte_size_ready);
+    return true;
+}