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// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "cast/common/channel/message_framer.h"
#include <stdlib.h>
#include <string.h>
#include <limits>
#include "cast/common/channel/proto/cast_channel.pb.h"
#include "util/big_endian.h"
#include "util/logging.h"
namespace cast {
namespace channel {
namespace message_serialization {
using openscreen::Error;
namespace {
static constexpr size_t kHeaderSize = sizeof(uint32_t);
// Cast specifies a max message body size of 64 KiB.
static constexpr size_t kMaxBodySize = 65536;
} // namespace
ErrorOr<std::vector<uint8_t>> Serialize(const CastMessage& message) {
const size_t message_size = message.ByteSizeLong();
if (message_size > kMaxBodySize || message_size == 0) {
return Error::Code::kCastV2InvalidMessage;
}
std::vector<uint8_t> out(message_size + kHeaderSize, 0);
openscreen::WriteBigEndian<uint32_t>(message_size, out.data());
if (!message.SerializeToArray(&out[kHeaderSize], message_size)) {
return Error::Code::kCastV2InvalidMessage;
}
return out;
}
ErrorOr<DeserializeResult> TryDeserialize(absl::Span<uint8_t> input) {
if (input.size() < kHeaderSize) {
return Error::Code::kInsufficientBuffer;
}
const uint32_t message_size =
openscreen::ReadBigEndian<uint32_t>(input.data());
if (message_size > kMaxBodySize) {
return Error::Code::kCastV2InvalidMessage;
}
if (input.size() < (kHeaderSize + message_size)) {
return Error::Code::kInsufficientBuffer;
}
DeserializeResult result;
if (!result.message.ParseFromArray(input.data() + kHeaderSize,
message_size)) {
return Error::Code::kCastV2InvalidMessage;
}
result.length = kHeaderSize + message_size;
return result;
}
} // namespace message_serialization
} // namespace channel
} // namespace cast
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