Add an "Append CRC32" block

grc/CMakeLists.txt

@@ -16,5 +16,6 @@ install(FILES
     ieee802_11_mapper.block.yml
     ieee802_11_parse_mac.block.yml
     ieee802_11_sync_long.block.yml
-    ieee802_11_sync_short.block.yml DESTINATION share/gnuradio/grc/blocks
+    ieee802_11_sync_short.block.yml
+    ieee802_11_append_crc32.block.yml DESTINATION share/gnuradio/grc/blocks
 )

grc/ieee802_11_append_crc32.block.yml

@@ -0,0 +1,26 @@
+id: ieee802_11_append_crc32
+label: Append CRC32
+category: '[IEEE802.11]'
+
+parameters:
+-   id: append
+    label: Append
+    dtype: bool
+    default: 'True'
+    options: ['True', 'False']
+    option_labels: [Enable, Disable]
+
+inputs:
+-   domain: message
+    id: in
+
+outputs:
+-   domain: message
+    id: out
+    optional: true
+
+templates:
+    imports: import ieee802_11
+    make: ieee802_11.append_crc32(${append})
+
+file_format: 1

include/ieee802_11/CMakeLists.txt

@@ -23,5 +23,5 @@ install(FILES
     signal_field.h
     sync_long.h
     sync_short.h
-    DESTINATION include/ieee802_11
+    append_crc32.h DESTINATION include/ieee802_11
 )

include/ieee802_11/append_crc32.h

@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2025 Nicolas Guillaume <nicol@sguillau.me>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef INCLUDED_IEEE802_11_APPEND_CRC32_H
+#define INCLUDED_IEEE802_11_APPEND_CRC32_H
+
+#include <gnuradio/block.h>
+#include <ieee802_11/api.h>
+
+namespace gr {
+namespace ieee802_11 {
+
+class IEEE802_11_API append_crc32 : virtual public block
+{
+public:
+    typedef std::shared_ptr<append_crc32> sptr;
+    static sptr make(bool append = true);
+};
+
+}
+}
+
+#endif

lib/CMakeLists.txt

@@ -40,6 +40,7 @@ list(APPEND ieee802_11_sources
     sync_short.cc
     utils.cc
     viterbi_decoder/base.cc
+    append_crc32_impl.cc
 )
 
 # use SSE2 optimized viterbi implementation if SSE2 is enabled

lib/append_crc32_impl.cc

@@ -0,0 +1,84 @@
+/*
+ * Copyright (C) 2025 Nicolas Guillaume <nicol@sguillau.me>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include "append_crc32_impl.h"
+
+#include <gnuradio/block_detail.h>
+#include <gnuradio/io_signature.h>
+
+#include <boost/bind/bind.hpp>
+#include <boost/crc.hpp>
+
+#include <cstdint>
+#include <cstring>
+#include <stdexcept>
+#include <vector>
+
+using namespace gr::ieee802_11;
+
+append_crc32::sptr append_crc32::make(bool append)
+{
+    return gnuradio::get_initial_sptr(new append_crc32_impl(append));
+}
+
+append_crc32_impl::append_crc32_impl(bool append)
+    : block("append_crc32",
+            gr::io_signature::make(0, 0, 0),
+            gr::io_signature::make(0, 0, 0)),
+      d_append(append)
+{
+    message_port_register_in(pmt::mp("in"));
+    set_msg_handler(pmt::mp("in"), boost::bind(&append_crc32_impl::handle, this, boost::placeholders::_1));
+    message_port_register_out(pmt::mp("out"));
+}
+
+void append_crc32_impl::handle(pmt::pmt_t msg)
+{
+    if(pmt::is_eof_object(msg))
+    {
+        detail().get()->set_done(true);
+        return;
+    }
+
+    if(!pmt::is_pair(msg))
+        throw std::invalid_argument("append_crc32 expects PDU pair");
+
+    pmt::pmt_t meta = pmt::car(msg);
+    pmt::pmt_t blob = pmt::cdr(msg);
+
+    if(!pmt::is_blob(blob))
+        throw std::invalid_argument("append_crc32 expects blob payload");
+
+    if(!d_append)
+    {
+        message_port_pub(pmt::mp("out"), pmt::cons(meta, blob));
+        return;
+    }
+
+    size_t len = pmt::blob_length(blob);
+    const uint8_t* data = reinterpret_cast<const uint8_t*>(pmt::blob_data(blob));
+
+    boost::crc_32_type result;
+    result.process_bytes(data, len);
+    uint32_t crc = result.checksum();
+
+    std::vector<uint8_t> out(len + sizeof(uint32_t));
+    std::memcpy(out.data(), data, len);
+    std::memcpy(out.data() + len, &crc, sizeof(uint32_t));
+
+    pmt::pmt_t out_blob = pmt::make_blob(out.data(), out.size());
+    message_port_pub(pmt::mp("out"), pmt::cons(meta, out_blob));
+}

lib/append_crc32_impl.h

@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2025 Nicolas Guillaume <nicol@sguillau.me>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef INCLUDED_IEEE802_11_APPEND_CRC32_IMPL_H
+#define INCLUDED_IEEE802_11_APPEND_CRC32_IMPL_H
+
+#include <ieee802_11/append_crc32.h>
+#include <pmt/pmt.h>
+
+namespace gr {
+namespace ieee802_11 {
+
+class append_crc32_impl : public append_crc32
+{
+public:
+    append_crc32_impl(bool append);
+
+private:
+    void handle(pmt::pmt_t msg);
+
+    bool d_append;
+};
+
+}
+}
+
+#endif

python/bindings/CMakeLists.txt

@@ -41,7 +41,7 @@ list(APPEND ieee802_11_python_files
     signal_field_python.cc
     sync_long_python.cc
     sync_short_python.cc
-    python_bindings.cc)
+    append_crc32_python.cc python_bindings.cc)
 
 GR_PYBIND_MAKE_OOT(ieee802_11 
    ../..

python/bindings/append_crc32_python.cc

@@ -0,0 +1,45 @@
+/*
+ * Copyright 2025 Free Software Foundation, Inc.
+ *
+ * This file is part of GNU Radio
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ *
+ */
+
+/***********************************************************************************/
+/* This file is automatically generated using bindtool and can be manually edited  */
+/* The following lines can be configured to regenerate this file during cmake      */
+/* If manual edits are made, the following tags should be modified accordingly.    */
+/* BINDTOOL_GEN_AUTOMATIC(1)                                                       */
+/* BINDTOOL_USE_PYGCCXML(0)                                                        */
+/* BINDTOOL_HEADER_FILE(append_crc32.h)                                        */
+/* BINDTOOL_HEADER_FILE_HASH(de483541a761081a4686ff1953728f8a)                     */
+/***********************************************************************************/
+
+#include <pybind11/complex.h>
+#include <pybind11/pybind11.h>
+#include <pybind11/stl.h>
+
+namespace py = pybind11;
+
+#include <ieee802_11/append_crc32.h>
+// pydoc.h is automatically generated in the build directory
+#include <append_crc32_pydoc.h>
+
+void bind_append_crc32(py::module& m)
+{
+
+    using append_crc32 = ::gr::ieee802_11::append_crc32;
+
+
+    py::class_<append_crc32, gr::block, gr::basic_block, std::shared_ptr<append_crc32>>(
+        m, "append_crc32", D(append_crc32))
+
+        .def(py::init(&append_crc32::make),
+             py::arg("append") = true,
+             D(append_crc32, make))
+
+
+        ;
+}

python/bindings/docstrings/append_crc32_pydoc_template.h

@@ -0,0 +1,24 @@
+/*
+ * Copyright 2025 Free Software Foundation, Inc.
+ *
+ * This file is part of GNU Radio
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ *
+ */
+#include "pydoc_macros.h"
+#define D(...) DOC(gr, ieee802_11, __VA_ARGS__)
+/*
+  This file contains placeholders for docstrings for the Python bindings.
+  Do not edit! These were automatically extracted during the binding process
+  and will be overwritten during the build process
+ */
+
+
+static const char* __doc_gr_ieee802_11_append_crc32 = R"doc()doc";
+
+
+static const char* __doc_gr_ieee802_11_append_crc32_append_crc32_0 = R"doc()doc";
+
+
+static const char* __doc_gr_ieee802_11_append_crc32_make = R"doc()doc";

python/bindings/python_bindings.cc

@@ -33,6 +33,7 @@ void bind_parse_mac(py::module& m);
 void bind_signal_field(py::module& m);
 void bind_sync_long(py::module& m);
 void bind_sync_short(py::module& m);
+void bind_append_crc32(py::module& m);
 // ) END BINDING_FUNCTION_PROTOTYPES
 
 
@@ -74,5 +75,6 @@ PYBIND11_MODULE(ieee802_11_python, m)
     bind_signal_field(m);
     bind_sync_long(m);
     bind_sync_short(m);
+    bind_append_crc32(m);
     // ) END BINDING_FUNCTION_CALLS
 }