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// Copyright 2020 The Pigweed Authors
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
// This function serves as a backend for pw_tokenizer / pw_log_tokenized that
// encodes tokenized logs as Base64 and writes them using HDLC.
#include "pw_log_tokenized/base64_over_hdlc.h"
#include <span>
#include "pw_hdlc/encoder.h"
#include "pw_stream/sys_io_stream.h"
#include "pw_tokenizer/base64.h"
#include "pw_tokenizer/tokenize_to_global_handler_with_payload.h"
namespace pw::log_tokenized {
namespace {
stream::SysIoWriter writer;
} // namespace
// Base64-encodes tokenized logs and writes them to pw::sys_io as HDLC frames.
extern "C" void pw_tokenizer_HandleEncodedMessageWithPayload(
pw_tokenizer_Payload, // TODO(hepler): Use the metadata for filtering.
const uint8_t log_buffer[],
size_t size_bytes) {
// Encode the tokenized message as Base64.
char base64_buffer[tokenizer::kDefaultBase64EncodedBufferSize];
const size_t base64_bytes = tokenizer::PrefixedBase64Encode(
std::span(log_buffer, size_bytes), base64_buffer);
base64_buffer[base64_bytes] = '\0';
// HDLC-encode the Base64 string via a SysIoWriter.
hdlc::WriteUIFrame(PW_LOG_TOKENIZED_BASE64_LOG_HDLC_ADDRESS,
std::as_bytes(std::span(base64_buffer, base64_bytes)),
writer);
}
} // namespace pw::log_tokenized
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