/*
 * Copyright (C) 2022 Mikhail Burakov. This file is part of toolbox.
 *
 * toolbox is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * toolbox is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with toolbox.  If not, see <https://www.gnu.org/licenses/>.
 */

#ifndef HTTP_PARSER_H_
#define HTTP_PARSER_H_

#include <stddef.h>

#ifdef __cplusplus
extern "C" {
#endif  // __cplusplus

enum HttpParser_Result {
  kHttpParser_ResultFinished = 0,
  kHttpParser_ResultWantMore,
  kHttpParser_ResultError,
};

struct HttpParser_Callbacks {
  void (*on_request)(void* user, const char* method, size_t method_size,
                     const char* target, size_t target_size);
  void (*on_field)(void* user, const char* name, size_t name_size,
                   const char* value, size_t value_size);
  void (*on_finished)(void* user, size_t offset);
};

struct HttpParser_State;

typedef enum HttpParser_Result (*HttpParser_Handler)(
    struct HttpParser_State*, const void*, size_t,
    const struct HttpParser_Callbacks*, void*);

struct HttpParser_State {
  HttpParser_Handler stage;
  int maybe_eol;
  size_t parsing_offset;
  size_t first_offset;
  size_t first_size;
  size_t second_offset;
  size_t second_size;
};

void HttpParser_Reset(struct HttpParser_State* state);
enum HttpParser_Result HttpParser_Parse(
    struct HttpParser_State* state, const void* buffer, size_t buffer_size,
    const struct HttpParser_Callbacks* callbacks, void* user);

#ifdef __cplusplus
}  // extern "C"
#endif  // __cplusplus

#endif  // HTTP_PARSER_H_