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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "remoting/host/security_key/security_key_message_writer.h"
#include <cstdint>
#include <string>
#include <utility>
#include "remoting/host/security_key/security_key_message.h"
namespace remoting {
SecurityKeyMessageWriter::SecurityKeyMessageWriter(base::File output_file)
: output_stream_(std::move(output_file)) {}
SecurityKeyMessageWriter::~SecurityKeyMessageWriter() {}
bool SecurityKeyMessageWriter::WriteMessage(
SecurityKeyMessageType message_type) {
return WriteMessageWithPayload(message_type, std::string());
}
bool SecurityKeyMessageWriter::WriteMessageWithPayload(
SecurityKeyMessageType message_type,
const std::string& message_payload) {
if (write_failed_ || !output_stream_.IsValid()) {
return false;
}
int message_payload_size_bytes = message_payload.size();
uint32_t total_message_size_bytes =
SecurityKeyMessage::kMessageTypeSizeBytes + message_payload_size_bytes;
CHECK(SecurityKeyMessage::IsValidMessageSize(total_message_size_bytes));
// First we send the message header which is the length of the message_type
// and message_payload in bytes.
if (!WriteBytesToOutput(reinterpret_cast<char*>(&total_message_size_bytes),
SecurityKeyMessage::kHeaderSizeBytes)) {
LOG(ERROR) << "Failed to send message header.";
return false;
}
// Next we send the message_type.
if (!WriteBytesToOutput(reinterpret_cast<char*>(&message_type),
SecurityKeyMessage::kMessageTypeSizeBytes)) {
LOG(ERROR) << "Failed to send message type.";
return false;
}
// Lastly, send the message data if appropriate.
if (!message_payload.empty()) {
if (!WriteBytesToOutput(message_payload.data(),
message_payload_size_bytes)) {
LOG(ERROR) << "Failed to send message payload.";
return false;
}
}
return true;
}
bool SecurityKeyMessageWriter::WriteBytesToOutput(const char* message,
int bytes_to_write) {
DCHECK(message);
DCHECK_GT(bytes_to_write, 0);
int result = output_stream_.WriteAtCurrentPos(message, bytes_to_write);
if (result != bytes_to_write) {
LOG(ERROR) << "Failed to write all bytes to output stream. bytes written: "
<< result << ", file error: "
<< base::File::ErrorToString(output_stream_.error_details());
write_failed_ = true;
return false;
}
return true;
}
} // namespace remoting
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