//
//
// Copyright 2015 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_SRC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_FRAME_SETTINGS_H
#define GRPC_SRC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_FRAME_SETTINGS_H

#include <grpc/support/port_platform.h>

#include <stddef.h>
#include <stdint.h>

#include <grpc/slice.h>

#include "src/core/ext/transport/chttp2/transport/http2_settings.h"
#include "src/core/ext/transport/chttp2/transport/legacy_frame.h"
#include "src/core/lib/iomgr/error.h"

typedef enum {
  GRPC_CHTTP2_SPS_ID0,
  GRPC_CHTTP2_SPS_ID1,
  GRPC_CHTTP2_SPS_VAL0,
  GRPC_CHTTP2_SPS_VAL1,
  GRPC_CHTTP2_SPS_VAL2,
  GRPC_CHTTP2_SPS_VAL3
} grpc_chttp2_settings_parse_state;

struct grpc_chttp2_settings_parser {
  grpc_chttp2_settings_parse_state state;
  uint32_t* target_settings;
  uint8_t is_ack;
  uint16_t id;
  uint32_t value;
  uint32_t incoming_settings[GRPC_CHTTP2_NUM_SETTINGS];
};
// Create a settings frame by diffing old & new, and updating old to be new
grpc_slice grpc_chttp2_settings_create(uint32_t* old_settings,
                                       const uint32_t* new_settings,
                                       uint32_t force_mask, size_t count);
// Create an ack settings frame
grpc_slice grpc_chttp2_settings_ack_create(void);

grpc_error_handle grpc_chttp2_settings_parser_begin_frame(
    grpc_chttp2_settings_parser* parser, uint32_t length, uint8_t flags,
    uint32_t* settings);
grpc_error_handle grpc_chttp2_settings_parser_parse(void* parser,
                                                    grpc_chttp2_transport* t,
                                                    grpc_chttp2_stream* s,
                                                    const grpc_slice& slice,
                                                    int is_last);

#endif  // GRPC_SRC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_FRAME_SETTINGS_H
