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56 lines
2.0 KiB
56 lines
2.0 KiB
// Copyright 2020 The Pigweed Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not
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// use this file except in compliance with the License. You may obtain a copy of
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// the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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// License for the specific language governing permissions and limitations under
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// the License.
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#include "pw_rpc/internal/nanopb_common.h"
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#include "pb_decode.h"
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#include "pb_encode.h"
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namespace pw::rpc::internal {
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// Nanopb 3 uses pb_field_s and Nanopb 4 uses pb_msgdesc_s for fields. The
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// Nanopb version macro is difficult to use, so deduce the correct type from the
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// pb_decode function.
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template <typename DecodeFunction>
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struct NanopbTraits;
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template <typename FieldsType>
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struct NanopbTraits<bool(pb_istream_t*, FieldsType, void*)> {
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using Fields = FieldsType;
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};
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using Fields = typename NanopbTraits<decltype(pb_decode)>::Fields;
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StatusWithSize NanopbMethodSerde::Encode(NanopbMessageDescriptor fields,
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ByteSpan buffer,
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const void* proto_struct) const {
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auto output = pb_ostream_from_buffer(
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reinterpret_cast<pb_byte_t*>(buffer.data()), buffer.size());
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if (!pb_encode(&output, static_cast<Fields>(fields), proto_struct)) {
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return StatusWithSize::Internal();
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}
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return StatusWithSize(output.bytes_written);
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}
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bool NanopbMethodSerde::Decode(NanopbMessageDescriptor fields,
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void* proto_struct,
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ConstByteSpan buffer) const {
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auto input = pb_istream_from_buffer(
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reinterpret_cast<const pb_byte_t*>(buffer.data()), buffer.size());
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return pb_decode(&input, static_cast<Fields>(fields), proto_struct);
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}
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} // namespace pw::rpc::internal
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