/*
 *
 * Copyright 2014, Google Inc.
 * All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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 */

#ifndef __GRPC_INTERNAL_TRANSPORT_CHTTP2_FRAME_DATA_H__
#define __GRPC_INTERNAL_TRANSPORT_CHTTP2_FRAME_DATA_H__

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

#include <grpc/support/slice.h>
#include <grpc/support/slice_buffer.h>
#include "src/core/transport/stream_op.h"
#include "src/core/transport/chttp2/frame.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_stream_state;

typedef struct {
  grpc_chttp2_stream_state state;
  gpr_uint8 is_last_frame;
  gpr_uint8 frame_type;
  gpr_uint32 frame_size;

  grpc_stream_op_buffer incoming_sopb;
} grpc_chttp2_data_parser;

/* initialize per-stream state for data frame parsing */
grpc_chttp2_parse_error grpc_chttp2_data_parser_init(
    grpc_chttp2_data_parser *parser);

void grpc_chttp2_data_parser_destroy(grpc_chttp2_data_parser *parser);

/* start processing a new data frame */
grpc_chttp2_parse_error grpc_chttp2_data_parser_begin_frame(
    grpc_chttp2_data_parser *parser, gpr_uint8 flags);

/* handle a slice of a data frame - is_last indicates the last slice of a
   frame */
grpc_chttp2_parse_error grpc_chttp2_data_parser_parse(
    void *parser, grpc_chttp2_parse_state *state, gpr_slice slice, int is_last);

/* create a slice with an empty data frame and is_last set */
gpr_slice grpc_chttp2_data_frame_create_empty_close(gpr_uint32 id);

#endif  /* __GRPC_INTERNAL_TRANSPORT_CHTTP2_FRAME_DATA_H__ */