python: Add bindings for C++ CHDR Parser

This commit adds pybind11 glue code for the userland chdr parsing code
introduced in the uhd::utils::chdr namespace. Additionally, it moves
some pybind11 adapter code to a common pybind_adaptors.hpp file which
originally existed in the cal_python.hpp file.

This commit also adds unit tests for the python bindings using a
captured wireshark trace which is located in rfnoc_packets_*.py and some
handwritten packets in hardcoded_packets.py

Signed-off-by: Samuel O'Brien <sam.obrien@ni.com>

2 files changed, 40 insertions, 0 deletions

diff --git a/host/include/uhd/utils/CMakeLists.txt b/host/include/uhd/utils/CMakeLists.txt
index 08d488771..51d67b824 100644
--- a/host/include/uhd/utils/CMakeLists.txt
+++ b/host/include/uhd/utils/CMakeLists.txt
@@ -29,6 +29,7 @@ UHD_INSTALL(FILES
     paths.hpp
     pimpl.hpp
     platform.hpp
+    pybind_adaptors.hpp
     safe_call.hpp
     safe_main.hpp
     scope_exit.hpp
diff --git a/host/include/uhd/utils/pybind_adaptors.hpp b/host/include/uhd/utils/pybind_adaptors.hpp
new file mode 100644
index 000000000..6b095d198
--- /dev/null
+++ b/host/include/uhd/utils/pybind_adaptors.hpp
@@ -0,0 +1,39 @@
+//
+// Copyright 2020 Ettus Research, a National Instruments Brand
+//
+// SPDX-License-Identifier: GPL-3.0-or-later
+//
+
+#pragma once
+
+#include <pybind11/pybind11.h>
+#include <pybind11/stl.h>
+
+namespace pybind11 { namespace detail {
+template <typename T>
+struct type_caster<boost::optional<T>> : optional_caster<boost::optional<T>>
+{
+};
+}} // namespace pybind11::detail
+
+std::vector<uint8_t> pybytes_to_vector(const py::bytes& data)
+{
+    const std::string data_str = std::string(data);
+    return std::vector<uint8_t>(data_str.cbegin(), data_str.cend());
+}
+
+py::bytes vector_to_pybytes(const std::vector<uint8_t>& data)
+{
+    return py::bytes(std::string(data.cbegin(), data.cend()));
+}
+
+std::vector<uint64_t> pybytes_to_u64_vector(const py::bytes& data)
+{
+    const std::string data_str = std::string(data);
+    return std::vector<uint64_t>(data_str.cbegin(), data_str.cend());
+}
+
+py::bytes u64_vector_to_pybytes(const std::vector<uint64_t>& data)
+{
+    return py::bytes(std::string(data.cbegin(), data.cend()));
+}