#ifndef http_parser_h
#define http_parser_h
#ifdef __cplusplus
extern "C" {
#endif

#define HTTP_PARSER_VERSION_MAJOR 2
#define HTTP_PARSER_VERSION_MINOR 9
#define HTTP_PARSER_VERSION_PATCH 4

#include <stddef.h>
#if defined(_WIN32) && !defined(__MINGW32__) &&                                \
    (!defined(_MSC_VER) || _MSC_VER < 1600) && !defined(__WINE__)
#include <BaseTsd.h>
typedef __int8 int8_t;
typedef unsigned __int8 uint8_t;
typedef __int16 int16_t;
typedef unsigned __int16 uint16_t;
typedef __int32 int32_t;
typedef unsigned __int32 uint32_t;
typedef __int64 int64_t;
typedef unsigned __int64 uint64_t;
#else
#include <stdint.h>
#endif

#ifndef HTTP_PARSER_STRICT
#define HTTP_PARSER_STRICT 1
#endif

#ifndef HTTP_MAX_HEADER_SIZE
#define HTTP_MAX_HEADER_SIZE (80 * 1024)
#endif

using http_parser = struct http_parser;
using http_parser_settings = struct http_parser_settings;

using http_data_cb = int (*)(http_parser *, const char *, size_t);
using http_cb = int (*)(http_parser *);

#define HTTP_STATUS_MAP(XX)                                                    \
  XX(100, CONTINUE, Continue)                                                  \
  XX(101, SWITCHING_PROTOCOLS, Switching Protocols)                            \
  XX(102, PROCESSING, Processing)                                              \
  XX(200, OK, OK)                                                              \
  XX(201, CREATED, Created)                                                    \
  XX(202, ACCEPTED, Accepted)                                                  \
  XX(203, NON_AUTHORITATIVE_INFORMATION, Non - Authoritative Information)      \
  XX(204, NO_CONTENT, No Content)                                              \
  XX(205, RESET_CONTENT, Reset Content)                                        \
  XX(206, PARTIAL_CONTENT, Partial Content)                                    \
  XX(207, MULTI_STATUS, Multi - Status)                                        \
  XX(208, ALREADY_REPORTED, Already Reported)                                  \
  XX(226, IM_USED, IM Used)                                                    \
  XX(300, MULTIPLE_CHOICES, Multiple Choices)                                  \
  XX(301, MOVED_PERMANENTLY, Moved Permanently)                                \
  XX(302, FOUND, Found)                                                        \
  XX(303, SEE_OTHER, See Other)                                                \
  XX(304, NOT_MODIFIED, Not Modified)                                          \
  XX(305, USE_PROXY, Use Proxy)                                                \
  XX(307, TEMPORARY_REDIRECT, Temporary Redirect)                              \
  XX(308, PERMANENT_REDIRECT, Permanent Redirect)                              \
  XX(400, BAD_REQUEST, Bad Request)                                            \
  XX(401, UNAUTHORIZED, Unauthorized)                                          \
  XX(402, PAYMENT_REQUIRED, Payment Required)                                  \
  XX(403, FORBIDDEN, Forbidden)                                                \
  XX(404, NOT_FOUND, Not Found)                                                \
  XX(405, METHOD_NOT_ALLOWED, Method Not Allowed)                              \
  XX(406, NOT_ACCEPTABLE, Not Acceptable)                                      \
  XX(407, PROXY_AUTHENTICATION_REQUIRED, Proxy Authentication Required)        \
  XX(408, REQUEST_TIMEOUT, Request Timeout)                                    \
  XX(409, CONFLICT, Conflict)                                                  \
  XX(410, GONE, Gone)                                                          \
  XX(411, LENGTH_REQUIRED, Length Required)                                    \
  XX(412, PRECONDITION_FAILED, Precondition Failed)                            \
  XX(413, PAYLOAD_TOO_LARGE, Payload Too Large)                                \
  XX(414, URI_TOO_LONG, URI Too Long)                                          \
  XX(415, UNSUPPORTED_MEDIA_TYPE, Unsupported Media Type)                      \
  XX(416, RANGE_NOT_SATISFIABLE, Range Not Satisfiable)                        \
  XX(417, EXPECTATION_FAILED, Expectation Failed)                              \
  XX(421, MISDIRECTED_REQUEST, Misdirected Request)                            \
  XX(422, UNPROCESSABLE_ENTITY, Unprocessable Entity)                          \
  XX(423, LOCKED, Locked)                                                      \
  XX(424, FAILED_DEPENDENCY, Failed Dependency)                                \
  XX(426, UPGRADE_REQUIRED, Upgrade Required)                                  \
  XX(428, PRECONDITION_REQUIRED, Precondition Required)                        \
  XX(429, TOO_MANY_REQUESTS, Too Many Requests)                                \
  XX(431, REQUEST_HEADER_FIELDS_TOO_LARGE, Request Header Fields Too Large)    \
  XX(451, UNAVAILABLE_FOR_LEGAL_REASONS, Unavailable For Legal Reasons)        \
  XX(500, INTERNAL_SERVER_ERROR, Internal Server Error)                        \
  XX(501, NOT_IMPLEMENTED, Not Implemented)                                    \
  XX(502, BAD_GATEWAY, Bad Gateway)                                            \
  XX(503, SERVICE_UNAVAILABLE, Service Unavailable)                            \
  XX(504, GATEWAY_TIMEOUT, Gateway Timeout)                                    \
  XX(505, HTTP_VERSION_NOT_SUPPORTED, HTTP Version Not Supported)              \
  XX(506, VARIANT_ALSO_NEGOTIATES, Variant Also Negotiates)                    \
  XX(507, INSUFFICIENT_STORAGE, Insufficient Storage)                          \
  XX(508, LOOP_DETECTED, Loop Detected)                                        \
  XX(510, NOT_EXTENDED, Not Extended)                                          \
  XX(511, NETWORK_AUTHENTICATION_REQUIRED, Network Authentication Required)

enum http_status {
#define XX(num, name, string) HTTP_STATUS_##name = num,
  HTTP_STATUS_MAP(XX)
#undef XX
};

#define HTTP_METHOD_MAP(XX)                                                    \
  XX(0, DELETE, DELETE)                                                        \
  XX(1, GET, GET)                                                              \
  XX(2, HEAD, HEAD)                                                            \
  XX(3, POST, POST)                                                            \
  XX(4, PUT, PUT)                                                              \
                                                                               \
  XX(5, CONNECT, CONNECT)                                                      \
  XX(6, OPTIONS, OPTIONS)                                                      \
  XX(7, TRACE, TRACE)                                                          \
                                                                               \
  XX(8, COPY, COPY)                                                            \
  XX(9, LOCK, LOCK)                                                            \
  XX(10, MKCOL, MKCOL)                                                         \
  XX(11, MOVE, MOVE)                                                           \
  XX(12, PROPFIND, PROPFIND)                                                   \
  XX(13, PROPPATCH, PROPPATCH)                                                 \
  XX(14, SEARCH, SEARCH)                                                       \
  XX(15, UNLOCK, UNLOCK)                                                       \
  XX(16, BIND, BIND)                                                           \
  XX(17, REBIND, REBIND)                                                       \
  XX(18, UNBIND, UNBIND)                                                       \
  XX(19, ACL, ACL)                                                             \
                                                                               \
  XX(20, REPORT, REPORT)                                                       \
  XX(21, MKACTIVITY, MKACTIVITY)                                               \
  XX(22, CHECKOUT, CHECKOUT)                                                   \
  XX(23, MERGE, MERGE)                                                         \
                                                                               \
  XX(24, MSEARCH, M - SEARCH)                                                  \
  XX(25, NOTIFY, NOTIFY)                                                       \
  XX(26, SUBSCRIBE, SUBSCRIBE)                                                 \
  XX(27, UNSUBSCRIBE, UNSUBSCRIBE)                                             \
                                                                               \
  XX(28, PATCH, PATCH)                                                         \
  XX(29, PURGE, PURGE)                                                         \
                                                                               \
  XX(30, MKCALENDAR, MKCALENDAR)                                               \
                                                                               \
  XX(31, LINK, LINK)                                                           \
  XX(32, UNLINK, UNLINK)                                                       \
                                                                               \
  XX(33, SOURCE, SOURCE)

enum http_method {
#define XX(num, name, string) HTTP_##name = num,
  HTTP_METHOD_MAP(XX)
#undef XX
};

enum http_parser_type { HTTP_REQUEST, HTTP_RESPONSE, HTTP_BOTH };

enum flags {
  F_CHUNKED = 1 << 0,
  F_CONNECTION_KEEP_ALIVE = 1 << 1,
  F_CONNECTION_CLOSE = 1 << 2,
  F_CONNECTION_UPGRADE = 1 << 3,
  F_TRAILING = 1 << 4,
  F_UPGRADE = 1 << 5,
  F_SKIPBODY = 1 << 6,
  F_CONTENTLENGTH = 1 << 7,
  F_TRANSFER_ENCODING = 1 << 8
};

#define HTTP_ERRNO_MAP(XX)                                                     \
                                                                               \
  XX(OK, "success")                                                            \
                                                                               \
  XX(CB_message_begin, "the on_message_begin callback failed")                 \
  XX(CB_url, "the on_url callback failed")                                     \
  XX(CB_header_field, "the on_header_field callback failed")                   \
  XX(CB_header_value, "the on_header_value callback failed")                   \
  XX(CB_headers_complete, "the on_headers_complete callback failed")           \
  XX(CB_body, "the on_body callback failed")                                   \
  XX(CB_message_complete, "the on_message_complete callback failed")           \
  XX(CB_status, "the on_status callback failed")                               \
  XX(CB_chunk_header, "the on_chunk_header callback failed")                   \
  XX(CB_chunk_complete, "the on_chunk_complete callback failed")               \
                                                                               \
  XX(INVALID_EOF_STATE, "stream ended at an unexpected time")                  \
  XX(HEADER_OVERFLOW, "too many header bytes seen; overflow detected")         \
  XX(CLOSED_CONNECTION,                                                        \
     "data received after completed connection: close message")                \
  XX(INVALID_VERSION, "invalid HTTP version")                                  \
  XX(INVALID_STATUS, "invalid HTTP status code")                               \
  XX(INVALID_METHOD, "invalid HTTP method")                                    \
  XX(INVALID_URL, "invalid URL")                                               \
  XX(INVALID_HOST, "invalid host")                                             \
  XX(INVALID_PORT, "invalid port")                                             \
  XX(INVALID_PATH, "invalid path")                                             \
  XX(INVALID_QUERY_STRING, "invalid query string")                             \
  XX(INVALID_FRAGMENT, "invalid fragment")                                     \
  XX(LF_EXPECTED, "LF character expected")                                     \
  XX(INVALID_HEADER_TOKEN, "invalid character in header")                      \
  XX(INVALID_CONTENT_LENGTH, "invalid character in content-length header")     \
  XX(UNEXPECTED_CONTENT_LENGTH, "unexpected content-length header")            \
  XX(INVALID_CHUNK_SIZE, "invalid character in chunk size header")             \
  XX(INVALID_CONSTANT, "invalid constant string")                              \
  XX(INVALID_INTERNAL_STATE, "encountered unexpected internal state")          \
  XX(STRICT, "strict mode assertion failed")                                   \
  XX(PAUSED, "parser is paused")                                               \
  XX(UNKNOWN, "an unknown error occurred")                                     \
  XX(INVALID_TRANSFER_ENCODING, "request has invalid transfer-encoding")

#define HTTP_ERRNO_GEN(n, s) HPE_##n,
enum http_errno { HTTP_ERRNO_MAP(HTTP_ERRNO_GEN) };
#undef HTTP_ERRNO_GEN

#define HTTP_PARSER_ERRNO(p) ((enum http_errno)(p)->http_errno)

struct http_parser {

  unsigned int type : 2;
  unsigned int flags : 8;
  unsigned int state : 7;
  unsigned int header_state : 7;
  unsigned int index : 5;
  unsigned int extra_flags : 2;
  unsigned int lenient_http_headers : 1;

  uint32_t nread;
  uint64_t content_length;

  unsigned short http_major;
  unsigned short http_minor;
  unsigned int status_code : 16;
  unsigned int method : 8;
  unsigned int http_errno : 7;

  unsigned int upgrade : 1;

  void *data;
};

struct http_parser_settings {
  http_cb on_message_begin;
  http_data_cb on_url;
  http_data_cb on_status;
  http_data_cb on_header_field;
  http_data_cb on_header_value;
  http_cb on_headers_complete;
  http_data_cb on_body;
  http_cb on_message_complete;

  http_cb on_chunk_header;
  http_cb on_chunk_complete;
};

enum http_parser_url_fields {
  UF_SCHEMA = 0,
  UF_HOST = 1,
  UF_PORT = 2,
  UF_PATH = 3,
  UF_QUERY = 4,
  UF_FRAGMENT = 5,
  UF_USERINFO = 6,
  UF_MAX = 7
};

struct http_parser_url {
  uint16_t field_set;
  uint16_t port;

  struct {
    uint16_t off;
    uint16_t len;
  } field_data[UF_MAX];
};

unsigned long http_parser_version(void);

void http_parser_init(http_parser *parser, enum http_parser_type type);

void http_parser_settings_init(http_parser_settings *settings);

size_t http_parser_execute(http_parser *parser,
                           const http_parser_settings *settings,
                           const char *data, size_t len);

int http_should_keep_alive(const http_parser *parser);

const char *http_method_str(enum http_method m);

const char *http_status_str(enum http_status s);

const char *http_errno_name(enum http_errno err);

const char *http_errno_description(enum http_errno err);

void http_parser_url_init(struct http_parser_url *u);

int http_parser_parse_url(const char *buf, size_t buflen, int is_connect,
                          struct http_parser_url *u);

void http_parser_pause(http_parser *parser, int paused);

int http_body_is_final(const http_parser *parser);

void http_parser_set_max_header_size(uint32_t size);

#ifdef __cplusplus
}
#endif
#endif