frame_handler.h

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/*
 *
 * Copyright 2018 gRPC 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
 *
 *     http://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.
 *
 */
 
#ifndef GRPC_CORE_TSI_ALTS_FRAME_PROTECTOR_FRAME_HANDLER_H
#define GRPC_CORE_TSI_ALTS_FRAME_PROTECTOR_FRAME_HANDLER_H
 
#include <grpc/support/port_platform.h>
 
#include <stdbool.h>
#include <stdlib.h>
 
const size_t kFrameMessageType = 0x06;
const size_t kFrameLengthFieldSize = 4;
const size_t kFrameMessageTypeFieldSize = 4;
const size_t kFrameMaxSize = 1024 * 1024;
const size_t kFrameHeaderSize =
    kFrameLengthFieldSize + kFrameMessageTypeFieldSize;
 
typedef struct alts_frame_writer {
  const unsigned char* input_buffer;
  unsigned char header_buffer[kFrameHeaderSize];
  size_t input_bytes_written;
  size_t header_bytes_written;
  size_t input_size;
} alts_frame_writer;
 
typedef struct alts_frame_reader {
  unsigned char* output_buffer;
  unsigned char header_buffer[kFrameHeaderSize];
  size_t header_bytes_read;
  size_t output_bytes_read;
  size_t bytes_remaining;
} alts_frame_reader;
 
alts_frame_writer* alts_create_frame_writer();
 
bool alts_reset_frame_writer(alts_frame_writer* writer,
                             const unsigned char* buffer, size_t length);
 
bool alts_write_frame_bytes(alts_frame_writer* writer, unsigned char* output,
                            size_t* bytes_size);
 
bool alts_is_frame_writer_done(alts_frame_writer* writer);
 
size_t alts_get_num_writer_bytes_remaining(alts_frame_writer* writer);
 
void alts_destroy_frame_writer(alts_frame_writer* writer);
 
alts_frame_reader* alts_create_frame_reader();
 
bool alts_reset_frame_reader(alts_frame_reader* reader, unsigned char* buffer);
 
bool alts_read_frame_bytes(alts_frame_reader* reader,
                           const unsigned char* bytes, size_t* bytes_size);
 
bool alts_has_read_frame_length(alts_frame_reader* reader);
 
size_t alts_get_reader_bytes_remaining(alts_frame_reader* reader);
 
void alts_reset_reader_output_buffer(alts_frame_reader* reader,
                                     unsigned char* buffer);
 
bool alts_is_frame_reader_done(alts_frame_reader* reader);
 
size_t alts_get_output_bytes_read(alts_frame_reader* reader);
 
unsigned char* alts_get_output_buffer(alts_frame_reader* reader);
 
void alts_destroy_frame_reader(alts_frame_reader* reader);
 
#endif /* GRPC_CORE_TSI_ALTS_FRAME_PROTECTOR_FRAME_HANDLER_H */