/*
 *
 * 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_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_FRAME_DATA_H
#define GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_FRAME_DATA_H

/* Parser for GRPC streams embedded in DATA frames */

#include <grpc/slice.h>
#include <grpc/slice_buffer.h>
#include "src/core/ext/transport/chttp2/transport/frame.h"
#include "src/core/lib/iomgr/exec_ctx.h"
#include "src/core/lib/transport/byte_stream.h"
#include "src/core/lib/transport/transport.h"

typedef enum {
  GRPC_CHTTP2_DATA_FH_0,
  GRPC_CHTTP2_DATA_FH_1,
  GRPC_CHTTP2_DATA_FH_2,
  GRPC_CHTTP2_DATA_FH_3,
  GRPC_CHTTP2_DATA_FH_4,
  GRPC_CHTTP2_DATA_FRAME,
  GRPC_CHTTP2_DATA_ERROR
} grpc_chttp2_stream_state;

typedef struct grpc_chttp2_incoming_byte_stream
    grpc_chttp2_incoming_byte_stream;

typedef struct {
  grpc_chttp2_stream_state state;
  uint8_t frame_type;
  uint32_t frame_size;
  grpc_error *error;

  bool is_frame_compressed;
  grpc_chttp2_incoming_byte_stream *parsing_frame;
} grpc_chttp2_data_parser;

/* initialize per-stream state for data frame parsing */
grpc_error *grpc_chttp2_data_parser_init(grpc_chttp2_data_parser *parser);

void grpc_chttp2_data_parser_destroy(grpc_exec_ctx *exec_ctx,
                                     grpc_chttp2_data_parser *parser);

/* start processing a new data frame */
grpc_error *grpc_chttp2_data_parser_begin_frame(grpc_chttp2_data_parser *parser,
                                                uint8_t flags,
                                                uint32_t stream_id,
                                                grpc_chttp2_stream *s);

/* handle a slice of a data frame - is_last indicates the last slice of a
   frame */
grpc_error *grpc_chttp2_data_parser_parse(grpc_exec_ctx *exec_ctx, void *parser,
                                          grpc_chttp2_transport *t,
                                          grpc_chttp2_stream *s,
                                          grpc_slice slice, int is_last);

void grpc_chttp2_encode_data(uint32_t id, grpc_slice_buffer *inbuf,
                             uint32_t write_bytes, int is_eof,
                             grpc_transport_one_way_stats *stats,
                             grpc_slice_buffer *outbuf);

grpc_error *grpc_deframe_unprocessed_incoming_frames(
    grpc_exec_ctx *exec_ctx, grpc_chttp2_data_parser *p, grpc_chttp2_stream *s,
    grpc_slice_buffer *slices, grpc_slice *slice_out,
    grpc_byte_stream **stream_out);

#endif /* GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_FRAME_DATA_H */
