157 lines
4.4 KiB
C++
157 lines
4.4 KiB
C++
// Copyright 2021 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_transfer/internal/chunk.h"
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#include "pw_protobuf/decoder.h"
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#include "pw_status/try.h"
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#include "pw_transfer/transfer.pwpb.h"
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namespace pw::transfer::internal {
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namespace ProtoChunk = transfer::Chunk;
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Result<uint32_t> ExtractTransferId(ConstByteSpan message) {
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protobuf::Decoder decoder(message);
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while (decoder.Next().ok()) {
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ProtoChunk::Fields field =
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static_cast<ProtoChunk::Fields>(decoder.FieldNumber());
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switch (field) {
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case ProtoChunk::Fields::TRANSFER_ID: {
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uint32_t transfer_id;
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PW_TRY(decoder.ReadUint32(&transfer_id));
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return transfer_id;
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}
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default:
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continue;
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}
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}
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return Status::DataLoss();
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}
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Status DecodeChunk(ConstByteSpan message, Chunk& chunk) {
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protobuf::Decoder decoder(message);
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Status status;
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uint32_t value;
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chunk = {};
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while ((status = decoder.Next()).ok()) {
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ProtoChunk::Fields field =
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static_cast<ProtoChunk::Fields>(decoder.FieldNumber());
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switch (field) {
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case ProtoChunk::Fields::TRANSFER_ID:
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PW_TRY(decoder.ReadUint32(&chunk.transfer_id));
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break;
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case ProtoChunk::Fields::PENDING_BYTES:
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PW_TRY(decoder.ReadUint32(&value));
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chunk.pending_bytes = value;
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break;
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case ProtoChunk::Fields::MAX_CHUNK_SIZE_BYTES:
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PW_TRY(decoder.ReadUint32(&value));
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chunk.max_chunk_size_bytes = value;
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break;
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case ProtoChunk::Fields::MIN_DELAY_MICROSECONDS:
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PW_TRY(decoder.ReadUint32(&value));
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chunk.min_delay_microseconds = value;
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break;
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case ProtoChunk::Fields::OFFSET:
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PW_TRY(decoder.ReadUint32(&chunk.offset));
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break;
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case ProtoChunk::Fields::DATA:
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PW_TRY(decoder.ReadBytes(&chunk.data));
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break;
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case ProtoChunk::Fields::REMAINING_BYTES: {
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uint64_t remaining;
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PW_TRY(decoder.ReadUint64(&remaining));
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chunk.remaining_bytes = remaining;
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break;
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}
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case ProtoChunk::Fields::STATUS:
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PW_TRY(decoder.ReadUint32(&value));
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chunk.status = static_cast<Status::Code>(value);
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break;
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case ProtoChunk::Fields::WINDOW_END_OFFSET:
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PW_TRY(decoder.ReadUint32(&chunk.window_end_offset));
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break;
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case ProtoChunk::Fields::TYPE: {
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uint32_t type;
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PW_TRY(decoder.ReadUint32(&type));
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chunk.type = static_cast<Chunk::Type>(type);
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break;
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}
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}
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}
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return status.IsOutOfRange() ? OkStatus() : status;
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}
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Result<ConstByteSpan> EncodeChunk(const Chunk& chunk, ByteSpan buffer) {
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ProtoChunk::MemoryEncoder encoder(buffer);
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encoder.WriteTransferId(chunk.transfer_id).IgnoreError();
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if (chunk.window_end_offset != 0) {
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encoder.WriteWindowEndOffset(chunk.window_end_offset).IgnoreError();
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}
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if (chunk.pending_bytes.has_value()) {
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encoder.WritePendingBytes(chunk.pending_bytes.value()).IgnoreError();
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}
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if (chunk.max_chunk_size_bytes.has_value()) {
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encoder.WriteMaxChunkSizeBytes(chunk.max_chunk_size_bytes.value())
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.IgnoreError();
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}
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if (chunk.min_delay_microseconds.has_value()) {
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encoder.WriteMinDelayMicroseconds(chunk.min_delay_microseconds.value())
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.IgnoreError();
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}
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if (chunk.offset != 0) {
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encoder.WriteOffset(chunk.offset).IgnoreError();
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}
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if (!chunk.data.empty()) {
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encoder.WriteData(chunk.data).IgnoreError();
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}
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if (chunk.remaining_bytes.has_value()) {
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encoder.WriteRemainingBytes(chunk.remaining_bytes.value()).IgnoreError();
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}
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if (chunk.status.has_value()) {
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encoder.WriteStatus(chunk.status.value().code()).IgnoreError();
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}
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if (chunk.type.has_value()) {
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encoder.WriteType(static_cast<ProtoChunk::Type>(chunk.type.value()))
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.IgnoreError();
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}
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PW_TRY(encoder.status());
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return ConstByteSpan(encoder);
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}
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} // namespace pw::transfer::internal
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