mirror of
https://github.com/kidfromjupiter/nearby.git
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61 lines
2.1 KiB
C++
61 lines
2.1 KiB
C++
// Copyright 2023 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of 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,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "internal/weave/message_write_request.h"
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#include <algorithm>
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#include <string>
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#include "absl/status/status.h"
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namespace nearby {
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namespace weave {
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MessageWriteRequest::MessageWriteRequest(absl::string_view message) {
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message_ = std::string(message);
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position_ = 0;
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}
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bool MessageWriteRequest::IsStarted() const { return position_ != 0; }
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bool MessageWriteRequest::IsFinished() const {
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return position_ >= message_.size();
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}
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// max_packet_size is determined and checked at the socket level, so we only
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// need to make sure we're getting a valid packet size > 0. We will take
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// max_packet_size - 1 (due to the header) bytes from the message if available,
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// otherwise taking the remaining bytes in the message and completing the
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// request.
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absl::StatusOr<Packet> MessageWriteRequest::NextPacket(int max_packet_size) {
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if (IsFinished()) {
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return absl::OutOfRangeError(
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"Message is finished sending, no more packets.");
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}
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if (max_packet_size <= 0) {
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return absl::InvalidArgumentError(
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"max_packet_size must be greater than 0.");
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}
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bool is_first = !IsStarted();
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int next_packet_len = std::min(max_packet_size - Packet::kPacketHeaderLength,
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(int)message_.size() - position_);
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auto next_packet_bytes = message_.substr(position_, next_packet_len);
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position_ += next_packet_len;
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return Packet::CreateDataPacket(is_first, IsFinished(),
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ByteArray(next_packet_bytes));
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}
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} // namespace weave
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} // namespace nearby
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