1 files changed, 148 insertions, 0 deletions
diff --git a/src/v1_decoder.cpp b/src/v1_decoder.cpp
new file mode 100644
index 0000000..b50f67f
--- /dev/null
+++ b/src/v1_decoder.cpp
@@ -0,0 +1,148 @@
+/*
+    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 <limits>
+
+#include "platform.hpp"
+#if defined ZMQ_HAVE_WINDOWS
+#include "windows.hpp"
+#endif
+
+#include "decoder.hpp"
+#include "v1_decoder.hpp"
+#include "likely.hpp"
+#include "wire.hpp"
+#include "err.hpp"
+
+zmq::v1_decoder_t::v1_decoder_t (size_t bufsize_, int64_t maxmsgsize_) :
+    decoder_base_t <v1_decoder_t> (bufsize_),
+    maxmsgsize (maxmsgsize_)
+{
+    int rc = in_progress.init ();
+    errno_assert (rc == 0);
+
+    //  At the beginning, read one byte and go to one_byte_size_ready state.
+    next_step (tmpbuf, 1, &v1_decoder_t::one_byte_size_ready);
+}
+
+zmq::v1_decoder_t::~v1_decoder_t ()
+{
+    int rc = in_progress.close ();
+    errno_assert (rc == 0);
+}
+
+int zmq::v1_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, &v1_decoder_t::eight_byte_size_ready);
+    else {
+
+        //  There has to be at least one byte (the flags) in the message).
+        if (!*tmpbuf) {
+            errno = EPROTO;
+            return -1;
+        }
+
+        if (maxmsgsize >= 0 && (int64_t) (*tmpbuf - 1) > maxmsgsize) {
+            errno = EMSGSIZE;
+            return -1;
+        }
+
+        //  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 = in_progress.init_size (*tmpbuf - 1);
+        if (rc != 0) {
+            errno_assert (errno == ENOMEM);
+            rc = in_progress.init ();
+            errno_assert (rc == 0);
+            errno = ENOMEM;
+            return -1;
+        }
+
+        next_step (tmpbuf, 1, &v1_decoder_t::flags_ready);
+    }
+    return 0;
+}
+
+int zmq::v1_decoder_t::eight_byte_size_ready ()
+{
+    //  8-byte payload length is read. Allocate the buffer
+    //  for message body and read the message data into it.
+    const uint64_t payload_length = get_uint64 (tmpbuf);
+
+    //  There has to be at least one byte (the flags) in the message).
+    if (payload_length == 0) {
+        errno = EPROTO;
+        return -1;
+    }
+
+    //  Message size must not exceed the maximum allowed size.
+    if (maxmsgsize >= 0 && payload_length - 1 > (uint64_t) maxmsgsize) {
+        errno = EMSGSIZE;
+        return -1;
+    }
+
+    //  Message size must fit within range of size_t data type.
+    if (payload_length - 1 > std::numeric_limits <size_t>::max ()) {
+        errno = EMSGSIZE;
+        return -1;
+    }
+
+    const size_t msg_size = static_cast <size_t> (payload_length - 1);
+
+    //  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...
+    int rc = in_progress.init_size (msg_size);
+    if (rc != 0) {
+        errno_assert (errno == ENOMEM);
+        rc = in_progress.init ();
+        errno_assert (rc == 0);
+        errno = ENOMEM;
+        return -1;
+    }
+
+    next_step (tmpbuf, 1, &v1_decoder_t::flags_ready);
+    return 0;
+}
+
+int zmq::v1_decoder_t::flags_ready ()
+{
+    //  Store the flags from the wire into the message structure.
+    in_progress.set_flags (tmpbuf [0] & msg_t::more);
+
+    next_step (in_progress.data (), in_progress.size (),
+        &v1_decoder_t::message_ready);
+
+    return 0;
+}
+
+int zmq::v1_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.)
+    next_step (tmpbuf, 1, &v1_decoder_t::one_byte_size_ready);
+    return 1;
+}