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authorMicah Anderson <micah@riseup.net>2014-08-11 16:30:52 -0400
committerMicah Anderson <micah@riseup.net>2014-08-11 16:30:52 -0400
commit686958a9db9b140c9665af8fd001e7032a37a46e (patch)
treec0f1a7b4f7d1ffc12ce54271da73edefee18e5b6 /src/v1_decoder.cpp
initial debian package import
Diffstat (limited to 'src/v1_decoder.cpp')
-rw-r--r--src/v1_decoder.cpp148
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
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+/*
+ 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;
+}