/* Copyright Joyent, Inc. and other Node contributors.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */
#include "http_parser.h"
#include <assert.h>
#include <ctype.h>
#include <limits.h>
#include <stddef.h>
#include <string.h>

static uint32_t max_header_size = HTTP_MAX_HEADER_SIZE;

#ifndef ULLONG_MAX
#define ULLONG_MAX ((uint64_t)-1) /* 2^64-1 */
#endif

#ifndef MIN
#define MIN(a, b) ((a) < (b) ? (a) : (b))
#endif

#ifndef ARRAY_SIZE
#define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
#endif

#ifndef BIT_AT
#define BIT_AT(a, i)                                \
	(!!((unsigned int)(a)[(unsigned int)(i) >> 3] & \
			(1 << ((unsigned int)(i)&7))))
#endif

#ifndef ELEM_AT
#define ELEM_AT(a, i, v) ((unsigned int)(i) < ARRAY_SIZE(a) ? (a)[(i)] : (v))
#endif

#define SET_ERRNO(e)              \
	do {                          \
		parser->nread = nread;    \
		parser->http_errno = (e); \
	} while (0)

#define CURRENT_STATE() p_state
#define UPDATE_STATE(V) p_state = (enum state)(V);
#define RETURN(V)                        \
	do {                                 \
		parser->nread = nread;           \
		parser->state = CURRENT_STATE(); \
		return (V);                      \
	} while (0);
#define REEXECUTE() \
	goto reexecute;

#ifdef __GNUC__
#define LIKELY(X) __builtin_expect(!!(X), 1)
#define UNLIKELY(X) __builtin_expect(!!(X), 0)
#else
#define LIKELY(X) (X)
#define UNLIKELY(X) (X)
#endif

/* Run the notify callback FOR, returning ER if it fails */
#define CALLBACK_NOTIFY_(FOR, ER)                                \
	do {                                                         \
		assert(HTTP_PARSER_ERRNO(parser) == HPE_OK);             \
                                                                 \
		if (LIKELY(settings->on_##FOR)) {                        \
			parser->state = CURRENT_STATE();                     \
			if (UNLIKELY(0 != settings->on_##FOR(parser))) {     \
				SET_ERRNO(HPE_CB_##FOR);                         \
			}                                                    \
			UPDATE_STATE(parser->state);                         \
                                                                 \
			/* We either errored above or got paused; get out */ \
			if (UNLIKELY(HTTP_PARSER_ERRNO(parser) != HPE_OK)) { \
				return (ER);                                     \
			}                                                    \
		}                                                        \
	} while (0)

/* Run the notify callback FOR and consume the current byte */
#define CALLBACK_NOTIFY(FOR) CALLBACK_NOTIFY_(FOR, p - data + 1)

/* Run the notify callback FOR and don't consume the current byte */
#define CALLBACK_NOTIFY_NOADVANCE(FOR) CALLBACK_NOTIFY_(FOR, p - data)

/* Run data callback FOR with LEN bytes, returning ER if it fails */
#define CALLBACK_DATA_(FOR, LEN, ER)                                          \
	do {                                                                      \
		assert(HTTP_PARSER_ERRNO(parser) == HPE_OK);                          \
                                                                              \
		if (FOR##_mark) {                                                     \
			if (LIKELY(settings->on_##FOR)) {                                 \
				parser->state = CURRENT_STATE();                              \
				if (UNLIKELY(0 !=                                             \
							settings->on_##FOR(parser, FOR##_mark, (LEN)))) { \
					SET_ERRNO(HPE_CB_##FOR);                                  \
				}                                                             \
				UPDATE_STATE(parser->state);                                  \
                                                                              \
				/* We either errored above or got paused; get out */          \
				if (UNLIKELY(HTTP_PARSER_ERRNO(parser) != HPE_OK)) {          \
					return (ER);                                              \
				}                                                             \
			}                                                                 \
			FOR##_mark = NULL;                                                \
		}                                                                     \
	} while (0)

/* Run the data callback FOR and consume the current byte */
#define CALLBACK_DATA(FOR) \
	CALLBACK_DATA_(FOR, p - FOR##_mark, p - data + 1)

/* Run the data callback FOR and don't consume the current byte */
#define CALLBACK_DATA_NOADVANCE(FOR) \
	CALLBACK_DATA_(FOR, p - FOR##_mark, p - data)

/* Set the mark FOR; non-destructive if mark is already set */
#define MARK(FOR)           \
	do {                    \
		if (!FOR##_mark) {  \
			FOR##_mark = p; \
		}                   \
	} while (0)

/* Don't allow the total size of the HTTP headers (including the status
 * line) to exceed max_header_size.  This check is here to protect
 * embedders against denial-of-service attacks where the attacker feeds
 * us a never-ending header that the embedder keeps buffering.
 *
 * This check is arguably the responsibility of embedders but we're doing
 * it on the embedder's behalf because most won't bother and this way we
 * make the web a little safer.  max_header_size is still far bigger
 * than any reasonable request or response so this should never affect
 * day-to-day operation.
 */
#define COUNT_HEADER_SIZE(V)                     \
	do {                                         \
		nread += (uint32_t)(V);                  \
		if (UNLIKELY(nread > max_header_size)) { \
			SET_ERRNO(HPE_HEADER_OVERFLOW);      \
			goto error;                          \
		}                                        \
	} while (0)

#define PROXY_CONNECTION "proxy-connection"
#define CONNECTION "connection"
#define CONTENT_LENGTH "content-length"
#define TRANSFER_ENCODING "transfer-encoding"
#define UPGRADE "upgrade"
#define CHUNKED "chunked"
#define KEEP_ALIVE "keep-alive"
#define CLOSE "close"

static const char *method_strings[] = {
#define XX(num, name, string) #string,
	HTTP_METHOD_MAP(XX)
#undef XX
};

/* Tokens as defined by rfc 2616. Also lowercases them.
 *        token       = 1*<any CHAR except CTLs or separators>
 *     separators     = "(" | ")" | "<" | ">" | "@"
 *                    | "," | ";" | ":" | "\" | <">
 *                    | "/" | "[" | "]" | "?" | "="
 *                    | "{" | "}" | SP | HT
 */
static const char tokens[256] = {
	/*   0 nul    1 soh    2 stx    3 etx    4 eot    5 enq    6 ack    7 bel  */
	0, 0, 0, 0, 0, 0, 0, 0,
	/*   8 bs     9 ht    10 nl    11 vt    12 np    13 cr    14 so    15 si   */
	0, 0, 0, 0, 0, 0, 0, 0,
	/*  16 dle   17 dc1   18 dc2   19 dc3   20 dc4   21 nak   22 syn   23 etb */
	0, 0, 0, 0, 0, 0, 0, 0,
	/*  24 can   25 em    26 sub   27 esc   28 fs    29 gs    30 rs    31 us  */
	0, 0, 0, 0, 0, 0, 0, 0,
	/*  32 sp    33  !    34  "    35  #    36  $    37  %    38  &    39  '  */
	' ', '!', 0, '#', '$', '%', '&', '\'',
	/*  40  (    41  )    42  *    43  +    44  ,    45  -    46  .    47  /  */
	0, 0, '*', '+', 0, '-', '.', 0,
	/*  48  0    49  1    50  2    51  3    52  4    53  5    54  6    55  7  */
	'0', '1', '2', '3', '4', '5', '6', '7',
	/*  56  8    57  9    58  :    59  ;    60  <    61  =    62  >    63  ?  */
	'8', '9', 0, 0, 0, 0, 0, 0,
	/*  64  @    65  A    66  B    67  C    68  D    69  E    70  F    71  G  */
	0, 'a', 'b', 'c', 'd', 'e', 'f', 'g',
	/*  72  H    73  I    74  J    75  K    76  L    77  M    78  N    79  O  */
	'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
	/*  80  P    81  Q    82  R    83  S    84  T    85  U    86  V    87  W  */
	'p', 'q', 'r', 's', 't', 'u', 'v', 'w',
	/*  88  X    89  Y    90  Z    91  [    92  \    93  ]    94  ^    95  _  */
	'x', 'y', 'z', 0, 0, 0, '^', '_',
	/*  96  `    97  a    98  b    99  c   100  d   101  e   102  f   103  g  */
	'`', 'a', 'b', 'c', 'd', 'e', 'f', 'g',
	/* 104  h   105  i   106  j   107  k   108  l   109  m   110  n   111  o  */
	'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
	/* 112  p   113  q   114  r   115  s   116  t   117  u   118  v   119  w  */
	'p', 'q', 'r', 's', 't', 'u', 'v', 'w',
	/* 120  x   121  y   122  z   123  {   124  |   125  }   126  ~   127 del */
	'x', 'y', 'z', 0, '|', 0, '~', 0
};

static const int8_t unhex[256] = { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, -1, -1, -1, -1, -1, -1, -1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 };

#if HTTP_PARSER_STRICT
#define T(v) 0
#else
#define T(v) v
#endif

static const uint8_t normal_url_char[32] = {
	/*   0 nul    1 soh    2 stx    3 etx    4 eot    5 enq    6 ack    7 bel  */
	0 | 0 | 0 | 0 | 0 | 0 | 0 | 0,
	/*   8 bs     9 ht    10 nl    11 vt    12 np    13 cr    14 so    15 si   */
	0 | T(2) | 0 | 0 | T(16) | 0 | 0 | 0,
	/*  16 dle   17 dc1   18 dc2   19 dc3   20 dc4   21 nak   22 syn   23 etb */
	0 | 0 | 0 | 0 | 0 | 0 | 0 | 0,
	/*  24 can   25 em    26 sub   27 esc   28 fs    29 gs    30 rs    31 us  */
	0 | 0 | 0 | 0 | 0 | 0 | 0 | 0,
	/*  32 sp    33  !    34  "    35  #    36  $    37  %    38  &    39  '  */
	0 | 2 | 4 | 0 | 16 | 32 | 64 | 128,
	/*  40  (    41  )    42  *    43  +    44  ,    45  -    46  .    47  /  */
	1 | 2 | 4 | 8 | 16 | 32 | 64 | 128,
	/*  48  0    49  1    50  2    51  3    52  4    53  5    54  6    55  7  */
	1 | 2 | 4 | 8 | 16 | 32 | 64 | 128,
	/*  56  8    57  9    58  :    59  ;    60  <    61  =    62  >    63  ?  */
	1 | 2 | 4 | 8 | 16 | 32 | 64 | 0,
	/*  64  @    65  A    66  B    67  C    68  D    69  E    70  F    71  G  */
	1 | 2 | 4 | 8 | 16 | 32 | 64 | 128,
	/*  72  H    73  I    74  J    75  K    76  L    77  M    78  N    79  O  */
	1 | 2 | 4 | 8 | 16 | 32 | 64 | 128,
	/*  80  P    81  Q    82  R    83  S    84  T    85  U    86  V    87  W  */
	1 | 2 | 4 | 8 | 16 | 32 | 64 | 128,
	/*  88  X    89  Y    90  Z    91  [    92  \    93  ]    94  ^    95  _  */
	1 | 2 | 4 | 8 | 16 | 32 | 64 | 128,
	/*  96  `    97  a    98  b    99  c   100  d   101  e   102  f   103  g  */
	1 | 2 | 4 | 8 | 16 | 32 | 64 | 128,
	/* 104  h   105  i   106  j   107  k   108  l   109  m   110  n   111  o  */
	1 | 2 | 4 | 8 | 16 | 32 | 64 | 128,
	/* 112  p   113  q   114  r   115  s   116  t   117  u   118  v   119  w  */
	1 | 2 | 4 | 8 | 16 | 32 | 64 | 128,
	/* 120  x   121  y   122  z   123  {   124  |   125  }   126  ~   127 del */
	1 | 2 | 4 | 8 | 16 | 32 | 64 | 0,
};

#undef T

enum state { s_dead = 1 /* important that this is > 0 */

	,
	s_start_req_or_res,
	s_res_or_resp_H,
	s_start_res,
	s_res_H,
	s_res_HT,
	s_res_HTT,
	s_res_HTTP,
	s_res_http_major,
	s_res_http_dot,
	s_res_http_minor,
	s_res_http_end,
	s_res_first_status_code,
	s_res_status_code,
	s_res_status_start,
	s_res_status,
	s_res_line_almost_done

	,
	s_start_req

	,
	s_req_method,
	s_req_spaces_before_url,
	s_req_schema,
	s_req_schema_slash,
	s_req_schema_slash_slash,
	s_req_server_start,
	s_req_server,
	s_req_server_with_at,
	s_req_path,
	s_req_query_string_start,
	s_req_query_string,
	s_req_fragment_start,
	s_req_fragment,
	s_req_http_start,
	s_req_http_H,
	s_req_http_HT,
	s_req_http_HTT,
	s_req_http_HTTP,
	s_req_http_I,
	s_req_http_IC,
	s_req_http_major,
	s_req_http_dot,
	s_req_http_minor,
	s_req_http_end,
	s_req_line_almost_done

	,
	s_header_field_start,
	s_header_field,
	s_header_value_discard_ws,
	s_header_value_discard_ws_almost_done,
	s_header_value_discard_lws,
	s_header_value_start,
	s_header_value,
	s_header_value_lws

	,
	s_header_almost_done

	,
	s_chunk_size_start,
	s_chunk_size,
	s_chunk_parameters,
	s_chunk_size_almost_done

	,
	s_headers_almost_done,
	s_headers_done

	/* Important: 's_headers_done' must be the last 'header' state. All
	 * states beyond this must be 'body' states. It is used for overflow
	 * checking. See the PARSING_HEADER() macro.
	 */

	,
	s_chunk_data,
	s_chunk_data_almost_done,
	s_chunk_data_done

	,
	s_body_identity,
	s_body_identity_eof

	,
	s_message_done
};

#define PARSING_HEADER(state) (state <= s_headers_done)

enum header_states { h_general = 0,
	h_C,
	h_CO,
	h_CON

	,
	h_matching_connection,
	h_matching_proxy_connection,
	h_matching_content_length,
	h_matching_transfer_encoding,
	h_matching_upgrade

	,
	h_connection,
	h_content_length,
	h_content_length_num,
	h_content_length_ws,
	h_transfer_encoding,
	h_upgrade

	,
	h_matching_transfer_encoding_token_start,
	h_matching_transfer_encoding_chunked,
	h_matching_transfer_encoding_token

	,
	h_matching_connection_token_start,
	h_matching_connection_keep_alive,
	h_matching_connection_close,
	h_matching_connection_upgrade,
	h_matching_connection_token

	,
	h_transfer_encoding_chunked,
	h_connection_keep_alive,
	h_connection_close,
	h_connection_upgrade
};

enum http_host_state {
	s_http_host_dead = 1,
	s_http_userinfo_start,
	s_http_userinfo,
	s_http_host_start,
	s_http_host_v6_start,
	s_http_host,
	s_http_host_v6,
	s_http_host_v6_end,
	s_http_host_v6_zone_start,
	s_http_host_v6_zone,
	s_http_host_port_start,
	s_http_host_port
};

/* Macros for character classes; depends on strict-mode  */
#define CR '\r'
#define LF '\n'
#define LOWER(c) (unsigned char)(c | 0x20)
#define IS_ALPHA(c) (LOWER(c) >= 'a' && LOWER(c) <= 'z')
#define IS_NUM(c) ((c) >= '0' && (c) <= '9')
#define IS_ALPHANUM(c) (IS_ALPHA(c) || IS_NUM(c))
#define IS_HEX(c) (IS_NUM(c) || (LOWER(c) >= 'a' && LOWER(c) <= 'f'))
#define IS_MARK(c) ((c) == '-' || (c) == '_' || (c) == '.' ||                  \
		(c) == '!' || (c) == '~' || (c) == '*' || (c) == '\'' || (c) == '(' || \
		(c) == ')')
#define IS_USERINFO_CHAR(c) (IS_ALPHANUM(c) || IS_MARK(c) || (c) == '%' ||    \
		(c) == ';' || (c) == ':' || (c) == '&' || (c) == '=' || (c) == '+' || \
		(c) == '$' || (c) == ',')

#define STRICT_TOKEN(c) ((c == ' ') ? 0 : tokens[(unsigned char)c])

#if HTTP_PARSER_STRICT
#define TOKEN(c) STRICT_TOKEN(c)
#define IS_URL_CHAR(c) (BIT_AT(normal_url_char, (unsigned char)c))
#define IS_HOST_CHAR(c) (IS_ALPHANUM(c) || (c) == '.' || (c) == '-')
#else
#define TOKEN(c) tokens[(unsigned char)c]
#define IS_URL_CHAR(c) \
	(BIT_AT(normal_url_char, (unsigned char)c) || ((c)&0x80))
#define IS_HOST_CHAR(c) \
	(IS_ALPHANUM(c) || (c) == '.' || (c) == '-' || (c) == '_')
#endif

/**
 * Verify that a char is a valid visible (printable) US-ASCII
 * character or %x80-FF
 **/
#define IS_HEADER_CHAR(ch) \
	(ch == CR || ch == LF || ch == 9 || ((unsigned char)ch > 31 && ch != 127))

#define start_state (parser->type == HTTP_REQUEST ? s_start_req : s_start_res)

#if HTTP_PARSER_STRICT
#define STRICT_CHECK(cond)         \
	do {                           \
		if (cond) {                \
			SET_ERRNO(HPE_STRICT); \
			goto error;            \
		}                          \
	} while (0)
#define NEW_MESSAGE() (http_should_keep_alive(parser) ? start_state : s_dead)
#else
#define STRICT_CHECK(cond)
#define NEW_MESSAGE() start_state
#endif

/* Map errno values to strings for human-readable output */
#define HTTP_STRERROR_GEN(n, s) { "HPE_" #n, s },
static struct {
	const char *name;
	const char *description;
} http_strerror_tab[] = {
	HTTP_ERRNO_MAP(HTTP_STRERROR_GEN)
};
#undef HTTP_STRERROR_GEN

int http_message_needs_eof(const http_parser *parser);

/* Our URL parser.
 *
 * This is designed to be shared by http_parser_execute() for URL validation,
 * hence it has a state transition + byte-for-byte interface. In addition, it
 * is meant to be embedded in http_parser_parse_url(), which does the dirty
 * work of turning state transitions URL components for its API.
 *
 * This function should only be invoked with non-space characters. It is
 * assumed that the caller cares about (and can detect) the transition between
 * URL and non-URL states by looking for these.
 */
static enum state
parse_url_char(enum state s, const char ch) {
	if (ch == ' ' || ch == '\r' || ch == '\n') {
		return s_dead;
	}

#if HTTP_PARSER_STRICT
	if (ch == '\t' || ch == '\f') {
		return s_dead;
	}
#endif

	switch (s) {
		case s_req_spaces_before_url:
			/* Proxied requests are followed by scheme of an absolute URI (alpha).
			 * All methods except CONNECT are followed by '/' or '*'.
			 */

			if (ch == '/' || ch == '*') {
				return s_req_path;
			}

			if (IS_ALPHA(ch)) {
				return s_req_schema;
			}

			break;

		case s_req_schema:
			if (IS_ALPHA(ch)) {
				return s;
			}

			if (ch == ':') {
				return s_req_schema_slash;
			}

			break;

		case s_req_schema_slash:
			if (ch == '/') {
				return s_req_schema_slash_slash;
			}

			break;

		case s_req_schema_slash_slash:
			if (ch == '/') {
				return s_req_server_start;
			}

			break;

		case s_req_server_with_at:
			if (ch == '@') {
				return s_dead;
			}

		/* fall through */
		case s_req_server_start:
		case s_req_server:
			if (ch == '/') {
				return s_req_path;
			}

			if (ch == '?') {
				return s_req_query_string_start;
			}

			if (ch == '@') {
				return s_req_server_with_at;
			}

			if (IS_USERINFO_CHAR(ch) || ch == '[' || ch == ']') {
				return s_req_server;
			}

			break;

		case s_req_path:
			if (IS_URL_CHAR(ch)) {
				return s;
			}

			switch (ch) {
				case '?':
					return s_req_query_string_start;

				case '#':
					return s_req_fragment_start;
			}

			break;

		case s_req_query_string_start:
		case s_req_query_string:
			if (IS_URL_CHAR(ch)) {
				return s_req_query_string;
			}

			switch (ch) {
				case '?':
					/* allow extra '?' in query string */
					return s_req_query_string;

				case '#':
					return s_req_fragment_start;
			}

			break;

		case s_req_fragment_start:
			if (IS_URL_CHAR(ch)) {
				return s_req_fragment;
			}

			switch (ch) {
				case '?':
					return s_req_fragment;

				case '#':
					return s;
			}

			break;

		case s_req_fragment:
			if (IS_URL_CHAR(ch)) {
				return s;
			}

			switch (ch) {
				case '?':
				case '#':
					return s;
			}

			break;

		default:
			break;
	}

	/* We should never fall out of the switch above unless there's an error */
	return s_dead;
}

size_t http_parser_execute(http_parser *parser,
		const http_parser_settings *settings,
		const char *data,
		size_t len) {
	char c, ch;
	int8_t unhex_val;
	const char *p = data;
	const char *header_field_mark = 0;
	const char *header_value_mark = 0;
	const char *url_mark = 0;
	const char *body_mark = 0;
	const char *status_mark = 0;
	enum state p_state = (enum state)parser->state;
	const unsigned int lenient = parser->lenient_http_headers;
	const unsigned int allow_chunked_length = parser->allow_chunked_length;

	uint32_t nread = parser->nread;

	/* We're in an error state. Don't bother doing anything. */
	if (HTTP_PARSER_ERRNO(parser) != HPE_OK) {
		return 0;
	}

	if (len == 0) {
		switch (CURRENT_STATE()) {
			case s_body_identity_eof:
				/* Use of CALLBACK_NOTIFY() here would erroneously return 1 byte read if
				 * we got paused.
				 */
				CALLBACK_NOTIFY_NOADVANCE(message_complete);
				return 0;

			case s_dead:
			case s_start_req_or_res:
			case s_start_res:
			case s_start_req:
				return 0;

			default:
				SET_ERRNO(HPE_INVALID_EOF_STATE);
				return 1;
		}
	}

	if (CURRENT_STATE() == s_header_field)
		header_field_mark = data;
	if (CURRENT_STATE() == s_header_value)
		header_value_mark = data;
	switch (CURRENT_STATE()) {
		case s_req_path:
		case s_req_schema:
		case s_req_schema_slash:
		case s_req_schema_slash_slash:
		case s_req_server_start:
		case s_req_server:
		case s_req_server_with_at:
		case s_req_query_string_start:
		case s_req_query_string:
		case s_req_fragment_start:
		case s_req_fragment:
			url_mark = data;
			break;
		case s_res_status:
			status_mark = data;
			break;
		default:
			break;
	}

	for (p = data; p != data + len; p++) {
		ch = *p;

		if (PARSING_HEADER(CURRENT_STATE()))
			COUNT_HEADER_SIZE(1);

	reexecute:
		switch (CURRENT_STATE()) {
			case s_dead:
				/* this state is used after a 'Connection: close' message
				 * the parser will error out if it reads another message
				 */
				if (LIKELY(ch == CR || ch == LF))
					break;

				SET_ERRNO(HPE_CLOSED_CONNECTION);
				goto error;

			case s_start_req_or_res: {
				if (ch == CR || ch == LF)
					break;
				parser->flags = 0;
				parser->uses_transfer_encoding = 0;
				parser->content_length = ULLONG_MAX;

				if (ch == 'H') {
					UPDATE_STATE(s_res_or_resp_H);

					CALLBACK_NOTIFY(message_begin);
				} else {
					parser->type = HTTP_REQUEST;
					UPDATE_STATE(s_start_req);
					REEXECUTE();
				}

				break;
			}

			case s_res_or_resp_H:
				if (ch == 'T') {
					parser->type = HTTP_RESPONSE;
					UPDATE_STATE(s_res_HT);
				} else {
					if (UNLIKELY(ch != 'E')) {
						SET_ERRNO(HPE_INVALID_CONSTANT);
						goto error;
					}

					parser->type = HTTP_REQUEST;
					parser->method = HTTP_HEAD;
					parser->index = 2;
					UPDATE_STATE(s_req_method);
				}
				break;

			case s_start_res: {
				if (ch == CR || ch == LF)
					break;
				parser->flags = 0;
				parser->uses_transfer_encoding = 0;
				parser->content_length = ULLONG_MAX;

				if (ch == 'H') {
					UPDATE_STATE(s_res_H);
				} else {
					SET_ERRNO(HPE_INVALID_CONSTANT);
					goto error;
				}

				CALLBACK_NOTIFY(message_begin);
				break;
			}

			case s_res_H:
				STRICT_CHECK(ch != 'T');
				UPDATE_STATE(s_res_HT);
				break;

			case s_res_HT:
				STRICT_CHECK(ch != 'T');
				UPDATE_STATE(s_res_HTT);
				break;

			case s_res_HTT:
				STRICT_CHECK(ch != 'P');
				UPDATE_STATE(s_res_HTTP);
				break;

			case s_res_HTTP:
				STRICT_CHECK(ch != '/');
				UPDATE_STATE(s_res_http_major);
				break;

			case s_res_http_major:
				if (UNLIKELY(!IS_NUM(ch))) {
					SET_ERRNO(HPE_INVALID_VERSION);
					goto error;
				}

				parser->http_major = ch - '0';
				UPDATE_STATE(s_res_http_dot);
				break;

			case s_res_http_dot: {
				if (UNLIKELY(ch != '.')) {
					SET_ERRNO(HPE_INVALID_VERSION);
					goto error;
				}

				UPDATE_STATE(s_res_http_minor);
				break;
			}

			case s_res_http_minor:
				if (UNLIKELY(!IS_NUM(ch))) {
					SET_ERRNO(HPE_INVALID_VERSION);
					goto error;
				}

				parser->http_minor = ch - '0';
				UPDATE_STATE(s_res_http_end);
				break;

			case s_res_http_end: {
				if (UNLIKELY(ch != ' ')) {
					SET_ERRNO(HPE_INVALID_VERSION);
					goto error;
				}

				UPDATE_STATE(s_res_first_status_code);
				break;
			}

			case s_res_first_status_code: {
				if (!IS_NUM(ch)) {
					if (ch == ' ') {
						break;
					}

					SET_ERRNO(HPE_INVALID_STATUS);
					goto error;
				}
				parser->status_code = ch - '0';
				UPDATE_STATE(s_res_status_code);
				break;
			}

			case s_res_status_code: {
				if (!IS_NUM(ch)) {
					switch (ch) {
						case ' ':
							UPDATE_STATE(s_res_status_start);
							break;
						case CR:
						case LF:
							UPDATE_STATE(s_res_status_start);
							REEXECUTE();
							break;
						default:
							SET_ERRNO(HPE_INVALID_STATUS);
							goto error;
					}
					break;
				}

				parser->status_code *= 10;
				parser->status_code += ch - '0';

				if (UNLIKELY(parser->status_code > 999)) {
					SET_ERRNO(HPE_INVALID_STATUS);
					goto error;
				}

				break;
			}

			case s_res_status_start: {
				MARK(status);
				UPDATE_STATE(s_res_status);
				parser->index = 0;

				if (ch == CR || ch == LF)
					REEXECUTE();

				break;
			}

			case s_res_status:
				if (ch == CR) {
					UPDATE_STATE(s_res_line_almost_done);
					CALLBACK_DATA(status);
					break;
				}

				if (ch == LF) {
					UPDATE_STATE(s_header_field_start);
					CALLBACK_DATA(status);
					break;
				}

				break;

			case s_res_line_almost_done:
				STRICT_CHECK(ch != LF);
				UPDATE_STATE(s_header_field_start);
				break;

			case s_start_req: {
				if (ch == CR || ch == LF)
					break;
				parser->flags = 0;
				parser->uses_transfer_encoding = 0;
				parser->content_length = ULLONG_MAX;

				if (UNLIKELY(!IS_ALPHA(ch))) {
					SET_ERRNO(HPE_INVALID_METHOD);
					goto error;
				}

				parser->method = (enum http_method)0;
				parser->index = 1;
				switch (ch) {
					case 'A':
						parser->method = HTTP_ACL;
						break;
					case 'B':
						parser->method = HTTP_BIND;
						break;
					case 'C':
						parser->method = HTTP_CONNECT; /* or COPY, CHECKOUT */
						break;
					case 'D':
						parser->method = HTTP_DELETE;
						break;
					case 'G':
						parser->method = HTTP_GET;
						break;
					case 'H':
						parser->method = HTTP_HEAD;
						break;
					case 'L':
						parser->method = HTTP_LOCK; /* or LINK */
						break;
					case 'M':
						parser->method = HTTP_MKCOL; /* or MOVE, MKACTIVITY, MERGE, M-SEARCH, MKCALENDAR */
						break;
					case 'N':
						parser->method = HTTP_NOTIFY;
						break;
					case 'O':
						parser->method = HTTP_OPTIONS;
						break;
					case 'P':
						parser->method = HTTP_POST;
						/* or PROPFIND|PROPPATCH|PUT|PATCH|PURGE */
						break;
					case 'R':
						parser->method = HTTP_REPORT; /* or REBIND */
						break;
					case 'S':
						parser->method = HTTP_SUBSCRIBE; /* or SEARCH, SOURCE */
						break;
					case 'T':
						parser->method = HTTP_TRACE;
						break;
					case 'U':
						parser->method = HTTP_UNLOCK; /* or UNSUBSCRIBE, UNBIND, UNLINK */
						break;
					default:
						SET_ERRNO(HPE_INVALID_METHOD);
						goto error;
				}
				UPDATE_STATE(s_req_method);

				CALLBACK_NOTIFY(message_begin);

				break;
			}

			case s_req_method: {
				const char *matcher;
				if (UNLIKELY(ch == '\0')) {
					SET_ERRNO(HPE_INVALID_METHOD);
					goto error;
				}

				matcher = method_strings[parser->method];
				if (ch == ' ' && matcher[parser->index] == '\0') {
					UPDATE_STATE(s_req_spaces_before_url);
				} else if (ch == matcher[parser->index]) {
					; /* nada */
				} else if ((ch >= 'A' && ch <= 'Z') || ch == '-') {
					switch (parser->method << 16 | parser->index << 8 | ch) {
#define XX(meth, pos, ch, new_meth)           \
	case (HTTP_##meth << 16 | pos << 8 | ch): \
		parser->method = HTTP_##new_meth;     \
		break;

						XX(POST, 1, 'U', PUT)
						XX(POST, 1, 'A', PATCH)
						XX(POST, 1, 'R', PROPFIND)
						XX(PUT, 2, 'R', PURGE)
						XX(CONNECT, 1, 'H', CHECKOUT)
						XX(CONNECT, 2, 'P', COPY)
						XX(MKCOL, 1, 'O', MOVE)
						XX(MKCOL, 1, 'E', MERGE)
						XX(MKCOL, 1, '-', MSEARCH)
						XX(MKCOL, 2, 'A', MKACTIVITY)
						XX(MKCOL, 3, 'A', MKCALENDAR)
						XX(SUBSCRIBE, 1, 'E', SEARCH)
						XX(SUBSCRIBE, 1, 'O', SOURCE)
						XX(REPORT, 2, 'B', REBIND)
						XX(PROPFIND, 4, 'P', PROPPATCH)
						XX(LOCK, 1, 'I', LINK)
						XX(UNLOCK, 2, 'S', UNSUBSCRIBE)
						XX(UNLOCK, 2, 'B', UNBIND)
						XX(UNLOCK, 3, 'I', UNLINK)
#undef XX
						default:
							SET_ERRNO(HPE_INVALID_METHOD);
							goto error;
					}
				} else {
					SET_ERRNO(HPE_INVALID_METHOD);
					goto error;
				}

				++parser->index;
				break;
			}

			case s_req_spaces_before_url: {
				if (ch == ' ')
					break;

				MARK(url);
				if (parser->method == HTTP_CONNECT) {
					UPDATE_STATE(s_req_server_start);
				}

				UPDATE_STATE(parse_url_char(CURRENT_STATE(), ch));
				if (UNLIKELY(CURRENT_STATE() == s_dead)) {
					SET_ERRNO(HPE_INVALID_URL);
					goto error;
				}

				break;
			}

			case s_req_schema:
			case s_req_schema_slash:
			case s_req_schema_slash_slash:
			case s_req_server_start: {
				switch (ch) {
					/* No whitespace allowed here */
					case ' ':
					case CR:
					case LF:
						SET_ERRNO(HPE_INVALID_URL);
						goto error;
					default:
						UPDATE_STATE(parse_url_char(CURRENT_STATE(), ch));
						if (UNLIKELY(CURRENT_STATE() == s_dead)) {
							SET_ERRNO(HPE_INVALID_URL);
							goto error;
						}
				}

				break;
			}

			case s_req_server:
			case s_req_server_with_at:
			case s_req_path:
			case s_req_query_string_start:
			case s_req_query_string:
			case s_req_fragment_start:
			case s_req_fragment: {
				switch (ch) {
					case ' ':
						UPDATE_STATE(s_req_http_start);
						CALLBACK_DATA(url);
						break;
					case CR:
					case LF:
						parser->http_major = 0;
						parser->http_minor = 9;
						UPDATE_STATE((ch == CR) ? s_req_line_almost_done : s_header_field_start);
						CALLBACK_DATA(url);
						break;
					default:
						UPDATE_STATE(parse_url_char(CURRENT_STATE(), ch));
						if (UNLIKELY(CURRENT_STATE() == s_dead)) {
							SET_ERRNO(HPE_INVALID_URL);
							goto error;
						}
				}
				break;
			}

			case s_req_http_start:
				switch (ch) {
					case ' ':
						break;
					case 'H':
						UPDATE_STATE(s_req_http_H);
						break;
					case 'I':
						if (parser->method == HTTP_SOURCE) {
							UPDATE_STATE(s_req_http_I);
							break;
						}
						/* fall through */
					default:
						SET_ERRNO(HPE_INVALID_CONSTANT);
						goto error;
				}
				break;

			case s_req_http_H:
				STRICT_CHECK(ch != 'T');
				UPDATE_STATE(s_req_http_HT);
				break;

			case s_req_http_HT:
				STRICT_CHECK(ch != 'T');
				UPDATE_STATE(s_req_http_HTT);
				break;

			case s_req_http_HTT:
				STRICT_CHECK(ch != 'P');
				UPDATE_STATE(s_req_http_HTTP);
				break;

			case s_req_http_I:
				STRICT_CHECK(ch != 'C');
				UPDATE_STATE(s_req_http_IC);
				break;

			case s_req_http_IC:
				STRICT_CHECK(ch != 'E');
				UPDATE_STATE(s_req_http_HTTP); /* Treat "ICE" as "HTTP". */
				break;

			case s_req_http_HTTP:
				STRICT_CHECK(ch != '/');
				UPDATE_STATE(s_req_http_major);
				break;

			case s_req_http_major:
				if (UNLIKELY(!IS_NUM(ch))) {
					SET_ERRNO(HPE_INVALID_VERSION);
					goto error;
				}

				parser->http_major = ch - '0';
				UPDATE_STATE(s_req_http_dot);
				break;

			case s_req_http_dot: {
				if (UNLIKELY(ch != '.')) {
					SET_ERRNO(HPE_INVALID_VERSION);
					goto error;
				}

				UPDATE_STATE(s_req_http_minor);
				break;
			}

			case s_req_http_minor:
				if (UNLIKELY(!IS_NUM(ch))) {
					SET_ERRNO(HPE_INVALID_VERSION);
					goto error;
				}

				parser->http_minor = ch - '0';
				UPDATE_STATE(s_req_http_end);
				break;

			case s_req_http_end: {
				if (ch == CR) {
					UPDATE_STATE(s_req_line_almost_done);
					break;
				}

				if (ch == LF) {
					UPDATE_STATE(s_header_field_start);
					break;
				}

				SET_ERRNO(HPE_INVALID_VERSION);
				goto error;
				break;
			}

			/* end of request line */
			case s_req_line_almost_done: {
				if (UNLIKELY(ch != LF)) {
					SET_ERRNO(HPE_LF_EXPECTED);
					goto error;
				}

				UPDATE_STATE(s_header_field_start);
				break;
			}

			case s_header_field_start: {
				if (ch == CR) {
					UPDATE_STATE(s_headers_almost_done);
					break;
				}

				if (ch == LF) {
					/* they might be just sending \n instead of \r\n so this would be
					 * the second \n to denote the end of headers*/
					UPDATE_STATE(s_headers_almost_done);
					REEXECUTE();
				}

				c = TOKEN(ch);

				if (UNLIKELY(!c)) {
					SET_ERRNO(HPE_INVALID_HEADER_TOKEN);
					goto error;
				}

				MARK(header_field);

				parser->index = 0;
				UPDATE_STATE(s_header_field);

				switch (c) {
					case 'c':
						parser->header_state = h_C;
						break;

					case 'p':
						parser->header_state = h_matching_proxy_connection;
						break;

					case 't':
						parser->header_state = h_matching_transfer_encoding;
						break;

					case 'u':
						parser->header_state = h_matching_upgrade;
						break;

					default:
						parser->header_state = h_general;
						break;
				}
				break;
			}

			case s_header_field: {
				const char *start = p;
				for (; p != data + len; p++) {
					ch = *p;
					c = TOKEN(ch);

					if (!c)
						break;

					switch (parser->header_state) {
						case h_general: {
							size_t left = data + len - p;
							const char *pe = p + MIN(left, max_header_size);
							while (p + 1 < pe && TOKEN(p[1])) {
								p++;
							}
							break;
						}

						case h_C:
							parser->index++;
							parser->header_state = (c == 'o' ? h_CO : h_general);
							break;

						case h_CO:
							parser->index++;
							parser->header_state = (c == 'n' ? h_CON : h_general);
							break;

						case h_CON:
							parser->index++;
							switch (c) {
								case 'n':
									parser->header_state = h_matching_connection;
									break;
								case 't':
									parser->header_state = h_matching_content_length;
									break;
								default:
									parser->header_state = h_general;
									break;
							}
							break;

							/* connection */

						case h_matching_connection:
							parser->index++;
							if (parser->index > sizeof(CONNECTION) - 1 || c != CONNECTION[parser->index]) {
								parser->header_state = h_general;
							} else if (parser->index == sizeof(CONNECTION) - 2) {
								parser->header_state = h_connection;
							}
							break;

							/* proxy-connection */

						case h_matching_proxy_connection:
							parser->index++;
							if (parser->index > sizeof(PROXY_CONNECTION) - 1 || c != PROXY_CONNECTION[parser->index]) {
								parser->header_state = h_general;
							} else if (parser->index == sizeof(PROXY_CONNECTION) - 2) {
								parser->header_state = h_connection;
							}
							break;

							/* content-length */

						case h_matching_content_length:
							parser->index++;
							if (parser->index > sizeof(CONTENT_LENGTH) - 1 || c != CONTENT_LENGTH[parser->index]) {
								parser->header_state = h_general;
							} else if (parser->index == sizeof(CONTENT_LENGTH) - 2) {
								parser->header_state = h_content_length;
							}
							break;

							/* transfer-encoding */

						case h_matching_transfer_encoding:
							parser->index++;
							if (parser->index > sizeof(TRANSFER_ENCODING) - 1 || c != TRANSFER_ENCODING[parser->index]) {
								parser->header_state = h_general;
							} else if (parser->index == sizeof(TRANSFER_ENCODING) - 2) {
								parser->header_state = h_transfer_encoding;
								parser->uses_transfer_encoding = 1;
							}
							break;

							/* upgrade */

						case h_matching_upgrade:
							parser->index++;
							if (parser->index > sizeof(UPGRADE) - 1 || c != UPGRADE[parser->index]) {
								parser->header_state = h_general;
							} else if (parser->index == sizeof(UPGRADE) - 2) {
								parser->header_state = h_upgrade;
							}
							break;

						case h_connection:
						case h_content_length:
						case h_transfer_encoding:
						case h_upgrade:
							if (ch != ' ')
								parser->header_state = h_general;
							break;

						default:
							assert(0 && "Unknown header_state");
							break;
					}
				}

				if (p == data + len) {
					--p;
					COUNT_HEADER_SIZE(p - start);
					break;
				}

				COUNT_HEADER_SIZE(p - start);

				if (ch == ':') {
					UPDATE_STATE(s_header_value_discard_ws);
					CALLBACK_DATA(header_field);
					break;
				}

				SET_ERRNO(HPE_INVALID_HEADER_TOKEN);
				goto error;
			}

			case s_header_value_discard_ws:
				if (ch == ' ' || ch == '\t')
					break;

				if (ch == CR) {
					UPDATE_STATE(s_header_value_discard_ws_almost_done);
					break;
				}

				if (ch == LF) {
					UPDATE_STATE(s_header_value_discard_lws);
					break;
				}

				/* fall through */

			case s_header_value_start: {
				MARK(header_value);

				UPDATE_STATE(s_header_value);
				parser->index = 0;

				c = LOWER(ch);

				switch (parser->header_state) {
					case h_upgrade:
						parser->flags |= F_UPGRADE;
						parser->header_state = h_general;
						break;

					case h_transfer_encoding:
						/* looking for 'Transfer-Encoding: chunked' */
						if ('c' == c) {
							parser->header_state = h_matching_transfer_encoding_chunked;
						} else {
							parser->header_state = h_matching_transfer_encoding_token;
						}
						break;

					/* Multi-value `Transfer-Encoding` header */
					case h_matching_transfer_encoding_token_start:
						break;

					case h_content_length:
						if (UNLIKELY(!IS_NUM(ch))) {
							SET_ERRNO(HPE_INVALID_CONTENT_LENGTH);
							goto error;
						}

						if (parser->flags & F_CONTENTLENGTH) {
							SET_ERRNO(HPE_UNEXPECTED_CONTENT_LENGTH);
							goto error;
						}

						parser->flags |= F_CONTENTLENGTH;
						parser->content_length = ch - '0';
						parser->header_state = h_content_length_num;
						break;

					/* when obsolete line folding is encountered for content length
					 * continue to the s_header_value state */
					case h_content_length_ws:
						break;

					case h_connection:
						/* looking for 'Connection: keep-alive' */
						if (c == 'k') {
							parser->header_state = h_matching_connection_keep_alive;
							/* looking for 'Connection: close' */
						} else if (c == 'c') {
							parser->header_state = h_matching_connection_close;
						} else if (c == 'u') {
							parser->header_state = h_matching_connection_upgrade;
						} else {
							parser->header_state = h_matching_connection_token;
						}
						break;

					/* Multi-value `Connection` header */
					case h_matching_connection_token_start:
						break;

					default:
						parser->header_state = h_general;
						break;
				}
				break;
			}

			case s_header_value: {
				const char *start = p;
				enum header_states h_state = (enum header_states)parser->header_state;
				for (; p != data + len; p++) {
					ch = *p;
					if (ch == CR) {
						UPDATE_STATE(s_header_almost_done);
						parser->header_state = h_state;
						CALLBACK_DATA(header_value);
						break;
					}

					if (ch == LF) {
						UPDATE_STATE(s_header_almost_done);
						COUNT_HEADER_SIZE(p - start);
						parser->header_state = h_state;
						CALLBACK_DATA_NOADVANCE(header_value);
						REEXECUTE();
					}

					if (!lenient && !IS_HEADER_CHAR(ch)) {
						SET_ERRNO(HPE_INVALID_HEADER_TOKEN);
						goto error;
					}

					c = LOWER(ch);

					switch (h_state) {
						case h_general: {
							size_t left = data + len - p;
							const char *pe = p + MIN(left, max_header_size);

							for (; p != pe; p++) {
								ch = *p;
								if (ch == CR || ch == LF) {
									--p;
									break;
								}
								if (!lenient && !IS_HEADER_CHAR(ch)) {
									SET_ERRNO(HPE_INVALID_HEADER_TOKEN);
									goto error;
								}
							}
							if (p == data + len)
								--p;
							break;
						}

						case h_connection:
						case h_transfer_encoding:
							assert(0 && "Shouldn't get here.");
							break;

						case h_content_length:
							if (ch == ' ')
								break;
							h_state = h_content_length_num;
							/* fall through */

						case h_content_length_num: {
							uint64_t t;

							if (ch == ' ') {
								h_state = h_content_length_ws;
								break;
							}

							if (UNLIKELY(!IS_NUM(ch))) {
								SET_ERRNO(HPE_INVALID_CONTENT_LENGTH);
								parser->header_state = h_state;
								goto error;
							}

							t = parser->content_length;
							t *= 10;
							t += ch - '0';

							/* Overflow? Test against a conservative limit for simplicity. */
							if (UNLIKELY((ULLONG_MAX - 10) / 10 < parser->content_length)) {
								SET_ERRNO(HPE_INVALID_CONTENT_LENGTH);
								parser->header_state = h_state;
								goto error;
							}

							parser->content_length = t;
							break;
						}

						case h_content_length_ws:
							if (ch == ' ')
								break;
							SET_ERRNO(HPE_INVALID_CONTENT_LENGTH);
							parser->header_state = h_state;
							goto error;

						/* Transfer-Encoding: chunked */
						case h_matching_transfer_encoding_token_start:
							/* looking for 'Transfer-Encoding: chunked' */
							if ('c' == c) {
								h_state = h_matching_transfer_encoding_chunked;
							} else if (STRICT_TOKEN(c)) {
								/* TODO(indutny): similar code below does this, but why?
								 * At the very least it seems to be inconsistent given that
								 * h_matching_transfer_encoding_token does not check for
								 * `STRICT_TOKEN`
								 */
								h_state = h_matching_transfer_encoding_token;
							} else if (c == ' ' || c == '\t') {
								/* Skip lws */
							} else {
								h_state = h_general;
							}
							break;

						case h_matching_transfer_encoding_chunked:
							parser->index++;
							if (parser->index > sizeof(CHUNKED) - 1 || c != CHUNKED[parser->index]) {
								h_state = h_matching_transfer_encoding_token;
							} else if (parser->index == sizeof(CHUNKED) - 2) {
								h_state = h_transfer_encoding_chunked;
							}
							break;

						case h_matching_transfer_encoding_token:
							if (ch == ',') {
								h_state = h_matching_transfer_encoding_token_start;
								parser->index = 0;
							}
							break;

						case h_matching_connection_token_start:
							/* looking for 'Connection: keep-alive' */
							if (c == 'k') {
								h_state = h_matching_connection_keep_alive;
								/* looking for 'Connection: close' */
							} else if (c == 'c') {
								h_state = h_matching_connection_close;
							} else if (c == 'u') {
								h_state = h_matching_connection_upgrade;
							} else if (STRICT_TOKEN(c)) {
								h_state = h_matching_connection_token;
							} else if (c == ' ' || c == '\t') {
								/* Skip lws */
							} else {
								h_state = h_general;
							}
							break;

						/* looking for 'Connection: keep-alive' */
						case h_matching_connection_keep_alive:
							parser->index++;
							if (parser->index > sizeof(KEEP_ALIVE) - 1 || c != KEEP_ALIVE[parser->index]) {
								h_state = h_matching_connection_token;
							} else if (parser->index == sizeof(KEEP_ALIVE) - 2) {
								h_state = h_connection_keep_alive;
							}
							break;

						/* looking for 'Connection: close' */
						case h_matching_connection_close:
							parser->index++;
							if (parser->index > sizeof(CLOSE) - 1 || c != CLOSE[parser->index]) {
								h_state = h_matching_connection_token;
							} else if (parser->index == sizeof(CLOSE) - 2) {
								h_state = h_connection_close;
							}
							break;

						/* looking for 'Connection: upgrade' */
						case h_matching_connection_upgrade:
							parser->index++;
							if (parser->index > sizeof(UPGRADE) - 1 ||
									c != UPGRADE[parser->index]) {
								h_state = h_matching_connection_token;
							} else if (parser->index == sizeof(UPGRADE) - 2) {
								h_state = h_connection_upgrade;
							}
							break;

						case h_matching_connection_token:
							if (ch == ',') {
								h_state = h_matching_connection_token_start;
								parser->index = 0;
							}
							break;

						case h_transfer_encoding_chunked:
							if (ch != ' ')
								h_state = h_matching_transfer_encoding_token;
							break;

						case h_connection_keep_alive:
						case h_connection_close:
						case h_connection_upgrade:
							if (ch == ',') {
								if (h_state == h_connection_keep_alive) {
									parser->flags |= F_CONNECTION_KEEP_ALIVE;
								} else if (h_state == h_connection_close) {
									parser->flags |= F_CONNECTION_CLOSE;
								} else if (h_state == h_connection_upgrade) {
									parser->flags |= F_CONNECTION_UPGRADE;
								}
								h_state = h_matching_connection_token_start;
								parser->index = 0;
							} else if (ch != ' ') {
								h_state = h_matching_connection_token;
							}
							break;

						default:
							UPDATE_STATE(s_header_value);
							h_state = h_general;
							break;
					}
				}
				parser->header_state = h_state;

				if (p == data + len)
					--p;

				COUNT_HEADER_SIZE(p - start);
				break;
			}

			case s_header_almost_done: {
				if (UNLIKELY(ch != LF)) {
					SET_ERRNO(HPE_LF_EXPECTED);
					goto error;
				}

				UPDATE_STATE(s_header_value_lws);
				break;
			}

			case s_header_value_lws: {
				if (ch == ' ' || ch == '\t') {
					if (parser->header_state == h_content_length_num) {
						/* treat obsolete line folding as space */
						parser->header_state = h_content_length_ws;
					}
					UPDATE_STATE(s_header_value_start);
					REEXECUTE();
				}

				/* finished the header */
				switch (parser->header_state) {
					case h_connection_keep_alive:
						parser->flags |= F_CONNECTION_KEEP_ALIVE;
						break;
					case h_connection_close:
						parser->flags |= F_CONNECTION_CLOSE;
						break;
					case h_transfer_encoding_chunked:
						parser->flags |= F_CHUNKED;
						break;
					case h_connection_upgrade:
						parser->flags |= F_CONNECTION_UPGRADE;
						break;
					default:
						break;
				}

				UPDATE_STATE(s_header_field_start);
				REEXECUTE();
			}

			case s_header_value_discard_ws_almost_done: {
				STRICT_CHECK(ch != LF);
				UPDATE_STATE(s_header_value_discard_lws);
				break;
			}

			case s_header_value_discard_lws: {
				if (ch == ' ' || ch == '\t') {
					UPDATE_STATE(s_header_value_discard_ws);
					break;
				} else {
					switch (parser->header_state) {
						case h_connection_keep_alive:
							parser->flags |= F_CONNECTION_KEEP_ALIVE;
							break;
						case h_connection_close:
							parser->flags |= F_CONNECTION_CLOSE;
							break;
						case h_connection_upgrade:
							parser->flags |= F_CONNECTION_UPGRADE;
							break;
						case h_transfer_encoding_chunked:
							parser->flags |= F_CHUNKED;
							break;
						case h_content_length:
							/* do not allow empty content length */
							SET_ERRNO(HPE_INVALID_CONTENT_LENGTH);
							goto error;
							break;
						default:
							break;
					}

					/* header value was empty */
					MARK(header_value);
					UPDATE_STATE(s_header_field_start);
					CALLBACK_DATA_NOADVANCE(header_value);
					REEXECUTE();
				}
			}

			case s_headers_almost_done: {
				STRICT_CHECK(ch != LF);

				if (parser->flags & F_TRAILING) {
					/* End of a chunked request */
					UPDATE_STATE(s_message_done);
					CALLBACK_NOTIFY_NOADVANCE(chunk_complete);
					REEXECUTE();
				}

				/* Cannot use transfer-encoding and a content-length header together
				   per the HTTP specification. (RFC 7230 Section 3.3.3) */
				if ((parser->uses_transfer_encoding == 1) &&
						(parser->flags & F_CONTENTLENGTH)) {
					/* Allow it for lenient parsing as long as `Transfer-Encoding` is
					 * not `chunked` or allow_length_with_encoding is set
					 */
					if (parser->flags & F_CHUNKED) {
						if (!allow_chunked_length) {
							SET_ERRNO(HPE_UNEXPECTED_CONTENT_LENGTH);
							goto error;
						}
					} else if (!lenient) {
						SET_ERRNO(HPE_UNEXPECTED_CONTENT_LENGTH);
						goto error;
					}
				}

				UPDATE_STATE(s_headers_done);

				/* Set this here so that on_headers_complete() callbacks can see it */
				if ((parser->flags & F_UPGRADE) &&
						(parser->flags & F_CONNECTION_UPGRADE)) {
					/* For responses, "Upgrade: foo" and "Connection: upgrade" are
					 * mandatory only when it is a 101 Switching Protocols response,
					 * otherwise it is purely informational, to announce support.
					 */
					parser->upgrade =
							(parser->type == HTTP_REQUEST || parser->status_code == 101);
				} else {
					parser->upgrade = (parser->method == HTTP_CONNECT);
				}

				/* Here we call the headers_complete callback. This is somewhat
				 * different than other callbacks because if the user returns 1, we
				 * will interpret that as saying that this message has no body. This
				 * is needed for the annoying case of receiving a response to a HEAD
				 * request.
				 *
				 * We'd like to use CALLBACK_NOTIFY_NOADVANCE() here but we cannot, so
				 * we have to simulate it by handling a change in errno below.
				 */
				if (settings->on_headers_complete) {
					switch (settings->on_headers_complete(parser)) {
						case 0:
							break;

						case 2:
							parser->upgrade = 1;

							/* fall through */
						case 1:
							parser->flags |= F_SKIPBODY;
							break;

						default:
							SET_ERRNO(HPE_CB_headers_complete);
							RETURN(p - data); /* Error */
					}
				}

				if (HTTP_PARSER_ERRNO(parser) != HPE_OK) {
					RETURN(p - data);
				}

				REEXECUTE();
			}

			case s_headers_done: {
				int hasBody;
				STRICT_CHECK(ch != LF);

				parser->nread = 0;
				nread = 0;

				hasBody = parser->flags & F_CHUNKED ||
						(parser->content_length > 0 && parser->content_length != ULLONG_MAX);
				if (parser->upgrade && (parser->method == HTTP_CONNECT || (parser->flags & F_SKIPBODY) || !hasBody)) {
					/* Exit, the rest of the message is in a different protocol. */
					UPDATE_STATE(NEW_MESSAGE());
					CALLBACK_NOTIFY(message_complete);
					RETURN((p - data) + 1);
				}

				if (parser->flags & F_SKIPBODY) {
					UPDATE_STATE(NEW_MESSAGE());
					CALLBACK_NOTIFY(message_complete);
				} else if (parser->flags & F_CHUNKED) {
					/* chunked encoding - ignore Content-Length header,
					 * prepare for a chunk */
					UPDATE_STATE(s_chunk_size_start);
				} else if (parser->uses_transfer_encoding == 1) {
					if (parser->type == HTTP_REQUEST && !lenient) {
						/* RFC 7230 3.3.3 */

						/* If a Transfer-Encoding header field
						 * is present in a request and the chunked transfer coding is not
						 * the final encoding, the message body length cannot be determined
						 * reliably; the server MUST respond with the 400 (Bad Request)
						 * status code and then close the connection.
						 */
						SET_ERRNO(HPE_INVALID_TRANSFER_ENCODING);
						RETURN(p - data); /* Error */
					} else {
						/* RFC 7230 3.3.3 */

						/* If a Transfer-Encoding header field is present in a response and
						 * the chunked transfer coding is not the final encoding, the
						 * message body length is determined by reading the connection until
						 * it is closed by the server.
						 */
						UPDATE_STATE(s_body_identity_eof);
					}
				} else {
					if (parser->content_length == 0) {
						/* Content-Length header given but zero: Content-Length: 0\r\n */
						UPDATE_STATE(NEW_MESSAGE());
						CALLBACK_NOTIFY(message_complete);
					} else if (parser->content_length != ULLONG_MAX) {
						/* Content-Length header given and non-zero */
						UPDATE_STATE(s_body_identity);
					} else {
						if (!http_message_needs_eof(parser)) {
							/* Assume content-length 0 - read the next */
							UPDATE_STATE(NEW_MESSAGE());
							CALLBACK_NOTIFY(message_complete);
						} else {
							/* Read body until EOF */
							UPDATE_STATE(s_body_identity_eof);
						}
					}
				}

				break;
			}

			case s_body_identity: {
				uint64_t to_read = MIN(parser->content_length,
						(uint64_t)((data + len) - p));

				assert(parser->content_length != 0 && parser->content_length != ULLONG_MAX);

				/* The difference between advancing content_length and p is because
				 * the latter will automatically advance on the next loop iteration.
				 * Further, if content_length ends up at 0, we want to see the last
				 * byte again for our message complete callback.
				 */
				MARK(body);
				parser->content_length -= to_read;
				p += to_read - 1;

				if (parser->content_length == 0) {
					UPDATE_STATE(s_message_done);

					/* Mimic CALLBACK_DATA_NOADVANCE() but with one extra byte.
					 *
					 * The alternative to doing this is to wait for the next byte to
					 * trigger the data callback, just as in every other case. The
					 * problem with this is that this makes it difficult for the test
					 * harness to distinguish between complete-on-EOF and
					 * complete-on-length. It's not clear that this distinction is
					 * important for applications, but let's keep it for now.
					 */
					CALLBACK_DATA_(body, p - body_mark + 1, p - data);
					REEXECUTE();
				}

				break;
			}

			/* read until EOF */
			case s_body_identity_eof:
				MARK(body);
				p = data + len - 1;

				break;

			case s_message_done:
				UPDATE_STATE(NEW_MESSAGE());
				CALLBACK_NOTIFY(message_complete);
				if (parser->upgrade) {
					/* Exit, the rest of the message is in a different protocol. */
					RETURN((p - data) + 1);
				}
				break;

			case s_chunk_size_start: {
				assert(nread == 1);
				assert(parser->flags & F_CHUNKED);

				unhex_val = unhex[(unsigned char)ch];
				if (UNLIKELY(unhex_val == -1)) {
					SET_ERRNO(HPE_INVALID_CHUNK_SIZE);
					goto error;
				}

				parser->content_length = unhex_val;
				UPDATE_STATE(s_chunk_size);
				break;
			}

			case s_chunk_size: {
				uint64_t t;

				assert(parser->flags & F_CHUNKED);

				if (ch == CR) {
					UPDATE_STATE(s_chunk_size_almost_done);
					break;
				}

				unhex_val = unhex[(unsigned char)ch];

				if (unhex_val == -1) {
					if (ch == ';' || ch == ' ') {
						UPDATE_STATE(s_chunk_parameters);
						break;
					}

					SET_ERRNO(HPE_INVALID_CHUNK_SIZE);
					goto error;
				}

				t = parser->content_length;
				t *= 16;
				t += unhex_val;

				/* Overflow? Test against a conservative limit for simplicity. */
				if (UNLIKELY((ULLONG_MAX - 16) / 16 < parser->content_length)) {
					SET_ERRNO(HPE_INVALID_CONTENT_LENGTH);
					goto error;
				}

				parser->content_length = t;
				break;
			}

			case s_chunk_parameters: {
				assert(parser->flags & F_CHUNKED);
				/* just ignore this shit. TODO check for overflow */
				if (ch == CR) {
					UPDATE_STATE(s_chunk_size_almost_done);
					break;
				}
				break;
			}

			case s_chunk_size_almost_done: {
				assert(parser->flags & F_CHUNKED);
				STRICT_CHECK(ch != LF);

				parser->nread = 0;
				nread = 0;

				if (parser->content_length == 0) {
					parser->flags |= F_TRAILING;
					UPDATE_STATE(s_header_field_start);
				} else {
					UPDATE_STATE(s_chunk_data);
				}
				CALLBACK_NOTIFY(chunk_header);
				break;
			}

			case s_chunk_data: {
				uint64_t to_read = MIN(parser->content_length,
						(uint64_t)((data + len) - p));

				assert(parser->flags & F_CHUNKED);
				assert(parser->content_length != 0 && parser->content_length != ULLONG_MAX);

				/* See the explanation in s_body_identity for why the content
				 * length and data pointers are managed this way.
				 */
				MARK(body);
				parser->content_length -= to_read;
				p += to_read - 1;

				if (parser->content_length == 0) {
					UPDATE_STATE(s_chunk_data_almost_done);
				}

				break;
			}

			case s_chunk_data_almost_done:
				assert(parser->flags & F_CHUNKED);
				assert(parser->content_length == 0);
				STRICT_CHECK(ch != CR);
				UPDATE_STATE(s_chunk_data_done);
				CALLBACK_DATA(body);
				break;

			case s_chunk_data_done:
				assert(parser->flags & F_CHUNKED);
				STRICT_CHECK(ch != LF);
				parser->nread = 0;
				nread = 0;
				UPDATE_STATE(s_chunk_size_start);
				CALLBACK_NOTIFY(chunk_complete);
				break;

			default:
				assert(0 && "unhandled state");
				SET_ERRNO(HPE_INVALID_INTERNAL_STATE);
				goto error;
		}
	}

	/* Run callbacks for any marks that we have leftover after we ran out of
	 * bytes. There should be at most one of these set, so it's OK to invoke
	 * them in series (unset marks will not result in callbacks).
	 *
	 * We use the NOADVANCE() variety of callbacks here because 'p' has already
	 * overflowed 'data' and this allows us to correct for the off-by-one that
	 * we'd otherwise have (since CALLBACK_DATA() is meant to be run with a 'p'
	 * value that's in-bounds).
	 */

	assert(((header_field_mark ? 1 : 0) +
				   (header_value_mark ? 1 : 0) +
				   (url_mark ? 1 : 0) +
				   (body_mark ? 1 : 0) +
				   (status_mark ? 1 : 0)) <= 1);

	CALLBACK_DATA_NOADVANCE(header_field);
	CALLBACK_DATA_NOADVANCE(header_value);
	CALLBACK_DATA_NOADVANCE(url);
	CALLBACK_DATA_NOADVANCE(body);
	CALLBACK_DATA_NOADVANCE(status);

	RETURN(len);

error:
	if (HTTP_PARSER_ERRNO(parser) == HPE_OK) {
		SET_ERRNO(HPE_UNKNOWN);
	}

	RETURN(p - data);
}

/* Does the parser need to see an EOF to find the end of the message? */
int http_message_needs_eof(const http_parser *parser) {
	if (parser->type == HTTP_REQUEST) {
		return 0;
	}

	/* See RFC 2616 section 4.4 */
	if (parser->status_code / 100 == 1 || /* 1xx e.g. Continue */
			parser->status_code == 204 || /* No Content */
			parser->status_code == 304 || /* Not Modified */
			parser->flags & F_SKIPBODY) { /* response to a HEAD request */
		return 0;
	}

	/* RFC 7230 3.3.3, see `s_headers_almost_done` */
	if ((parser->uses_transfer_encoding == 1) &&
			(parser->flags & F_CHUNKED) == 0) {
		return 1;
	}

	if ((parser->flags & F_CHUNKED) || parser->content_length != ULLONG_MAX) {
		return 0;
	}

	return 1;
}

int http_should_keep_alive(const http_parser *parser) {
	if (parser->http_major > 0 && parser->http_minor > 0) {
		/* HTTP/1.1 */
		if (parser->flags & F_CONNECTION_CLOSE) {
			return 0;
		}
	} else {
		/* HTTP/1.0 or earlier */
		if (!(parser->flags & F_CONNECTION_KEEP_ALIVE)) {
			return 0;
		}
	}

	return !http_message_needs_eof(parser);
}

const char *
http_method_str(enum http_method m) {
	return ELEM_AT(method_strings, m, "<unknown>");
}

const char *
http_status_str(enum http_status s) {
	switch (s) {
#define XX(num, name, string) \
	case HTTP_STATUS_##name:  \
		return #string;
		HTTP_STATUS_MAP(XX)
#undef XX
		default:
			return "<unknown>";
	}
}

void http_parser_init(http_parser *parser, enum http_parser_type t) {
	void *data = parser->data; /* preserve application data */
	memset(parser, 0, sizeof(*parser));
	parser->data = data;
	parser->type = t;
	parser->state = (t == HTTP_REQUEST ? s_start_req : (t == HTTP_RESPONSE ? s_start_res : s_start_req_or_res));
	parser->http_errno = HPE_OK;
}

void http_parser_settings_init(http_parser_settings *settings) {
	memset(settings, 0, sizeof(*settings));
}

const char *
http_errno_name(enum http_errno err) {
	assert(((size_t)err) < ARRAY_SIZE(http_strerror_tab));
	return http_strerror_tab[err].name;
}

const char *
http_errno_description(enum http_errno err) {
	assert(((size_t)err) < ARRAY_SIZE(http_strerror_tab));
	return http_strerror_tab[err].description;
}

static enum http_host_state
http_parse_host_char(enum http_host_state s, const char ch) {
	switch (s) {
		case s_http_userinfo:
		case s_http_userinfo_start:
			if (ch == '@') {
				return s_http_host_start;
			}

			if (IS_USERINFO_CHAR(ch)) {
				return s_http_userinfo;
			}
			break;

		case s_http_host_start:
			if (ch == '[') {
				return s_http_host_v6_start;
			}

			if (IS_HOST_CHAR(ch)) {
				return s_http_host;
			}

			break;

		case s_http_host:
			if (IS_HOST_CHAR(ch)) {
				return s_http_host;
			}

		/* fall through */
		case s_http_host_v6_end:
			if (ch == ':') {
				return s_http_host_port_start;
			}

			break;

		case s_http_host_v6:
			if (ch == ']') {
				return s_http_host_v6_end;
			}

		/* fall through */
		case s_http_host_v6_start:
			if (IS_HEX(ch) || ch == ':' || ch == '.') {
				return s_http_host_v6;
			}

			if (s == s_http_host_v6 && ch == '%') {
				return s_http_host_v6_zone_start;
			}
			break;

		case s_http_host_v6_zone:
			if (ch == ']') {
				return s_http_host_v6_end;
			}

		/* fall through */
		case s_http_host_v6_zone_start:
			/* RFC 6874 Zone ID consists of 1*( unreserved / pct-encoded) */
			if (IS_ALPHANUM(ch) || ch == '%' || ch == '.' || ch == '-' || ch == '_' ||
					ch == '~') {
				return s_http_host_v6_zone;
			}
			break;

		case s_http_host_port:
		case s_http_host_port_start:
			if (IS_NUM(ch)) {
				return s_http_host_port;
			}

			break;

		default:
			break;
	}
	return s_http_host_dead;
}

static int
http_parse_host(const char *buf, struct http_parser_url *u, int found_at) {
	enum http_host_state s;

	const char *p;
	size_t buflen = u->field_data[UF_HOST].off + u->field_data[UF_HOST].len;

	assert(u->field_set & (1 << UF_HOST));

	u->field_data[UF_HOST].len = 0;

	s = found_at ? s_http_userinfo_start : s_http_host_start;

	for (p = buf + u->field_data[UF_HOST].off; p < buf + buflen; p++) {
		enum http_host_state new_s = http_parse_host_char(s, *p);

		if (new_s == s_http_host_dead) {
			return 1;
		}

		switch (new_s) {
			case s_http_host:
				if (s != s_http_host) {
					u->field_data[UF_HOST].off = (uint16_t)(p - buf);
				}
				u->field_data[UF_HOST].len++;
				break;

			case s_http_host_v6:
				if (s != s_http_host_v6) {
					u->field_data[UF_HOST].off = (uint16_t)(p - buf);
				}
				u->field_data[UF_HOST].len++;
				break;

			case s_http_host_v6_zone_start:
			case s_http_host_v6_zone:
				u->field_data[UF_HOST].len++;
				break;

			case s_http_host_port:
				if (s != s_http_host_port) {
					u->field_data[UF_PORT].off = (uint16_t)(p - buf);
					u->field_data[UF_PORT].len = 0;
					u->field_set |= (1 << UF_PORT);
				}
				u->field_data[UF_PORT].len++;
				break;

			case s_http_userinfo:
				if (s != s_http_userinfo) {
					u->field_data[UF_USERINFO].off = (uint16_t)(p - buf);
					u->field_data[UF_USERINFO].len = 0;
					u->field_set |= (1 << UF_USERINFO);
				}
				u->field_data[UF_USERINFO].len++;
				break;

			default:
				break;
		}
		s = new_s;
	}

	/* Make sure we don't end somewhere unexpected */
	switch (s) {
		case s_http_host_start:
		case s_http_host_v6_start:
		case s_http_host_v6:
		case s_http_host_v6_zone_start:
		case s_http_host_v6_zone:
		case s_http_host_port_start:
		case s_http_userinfo:
		case s_http_userinfo_start:
			return 1;
		default:
			break;
	}

	return 0;
}

void http_parser_url_init(struct http_parser_url *u) {
	memset(u, 0, sizeof(*u));
}

int http_parser_parse_url(const char *buf, size_t buflen, int is_connect,
		struct http_parser_url *u) {
	enum state s;
	const char *p;
	enum http_parser_url_fields uf, old_uf;
	int found_at = 0;

	if (buflen == 0) {
		return 1;
	}

	u->port = u->field_set = 0;
	s = is_connect ? s_req_server_start : s_req_spaces_before_url;
	old_uf = UF_MAX;

	for (p = buf; p < buf + buflen; p++) {
		s = parse_url_char(s, *p);

		/* Figure out the next field that we're operating on */
		switch (s) {
			case s_dead:
				return 1;

			/* Skip delimiters */
			case s_req_schema_slash:
			case s_req_schema_slash_slash:
			case s_req_server_start:
			case s_req_query_string_start:
			case s_req_fragment_start:
				continue;

			case s_req_schema:
				uf = UF_SCHEMA;
				break;

			case s_req_server_with_at:
				found_at = 1;

			/* fall through */
			case s_req_server:
				uf = UF_HOST;
				break;

			case s_req_path:
				uf = UF_PATH;
				break;

			case s_req_query_string:
				uf = UF_QUERY;
				break;

			case s_req_fragment:
				uf = UF_FRAGMENT;
				break;

			default:
				assert(!"Unexpected state");
				return 1;
		}

		/* Nothing's changed; soldier on */
		if (uf == old_uf) {
			u->field_data[uf].len++;
			continue;
		}

		u->field_data[uf].off = (uint16_t)(p - buf);
		u->field_data[uf].len = 1;

		u->field_set |= (1 << uf);
		old_uf = uf;
	}

	/* host must be present if there is a schema */
	/* parsing http:///toto will fail */
	if ((u->field_set & (1 << UF_SCHEMA)) &&
			(u->field_set & (1 << UF_HOST)) == 0) {
		return 1;
	}

	if (u->field_set & (1 << UF_HOST)) {
		if (http_parse_host(buf, u, found_at) != 0) {
			return 1;
		}
	}

	/* CONNECT requests can only contain "hostname:port" */
	if (is_connect && u->field_set != ((1 << UF_HOST) | (1 << UF_PORT))) {
		return 1;
	}

	if (u->field_set & (1 << UF_PORT)) {
		uint16_t off;
		uint16_t len;
		const char *pl;
		const char *end;
		unsigned long v;

		off = u->field_data[UF_PORT].off;
		len = u->field_data[UF_PORT].len;
		end = buf + off + len;

		/* NOTE: The characters are already validated and are in the [0-9] range */
		assert((size_t)(off + len) <= buflen && "Port number overflow");
		v = 0;
		for (pl = buf + off; pl < end; pl++) {
			v *= 10;
			v += *pl - '0';

			/* Ports have a max value of 2^16 */
			if (v > 0xffff) {
				return 1;
			}
		}

		u->port = (uint16_t)v;
	}

	return 0;
}

void http_parser_pause(http_parser *parser, int paused) {
	/* Users should only be pausing/unpausing a parser that is not in an error
	 * state. In non-debug builds, there's not much that we can do about this
	 * other than ignore it.
	 */
	if (HTTP_PARSER_ERRNO(parser) == HPE_OK ||
			HTTP_PARSER_ERRNO(parser) == HPE_PAUSED) {
		uint32_t nread = parser->nread; /* used by the SET_ERRNO macro */
		SET_ERRNO((paused) ? HPE_PAUSED : HPE_OK);
	} else {
		assert(0 && "Attempting to pause parser in error state");
	}
}

int http_body_is_final(const struct http_parser *parser) {
	return parser->state == s_message_done;
}

unsigned long
http_parser_version(void) {
	return HTTP_PARSER_VERSION_MAJOR * 0x10000 |
			HTTP_PARSER_VERSION_MINOR * 0x00100 |
			HTTP_PARSER_VERSION_PATCH * 0x00001;
}

void http_parser_set_max_header_size(uint32_t size) {
	max_header_size = size;
}