text: /*
   * http_kv - HTTP version, method, status key-value string mapping
   *
   * Fully-rewritten from original
   * Copyright(c) 2018 Glenn Strauss gstrauss()gluelogic.com  All rights reserved
   * License: BSD 3-clause (same as lighttpd)
   */
  #include "first.h"
  
  #include "http_kv.h"
  #include "buffer.h"
  
  #include <string.h>
  
  typedef struct {
  	int key;
  	unsigned int vlen;
  	const char *value;
  } keyvalue;
  
  static const keyvalue http_versions[] = {
  	{ HTTP_VERSION_1_1, CONST_LEN_STR("HTTP/1.1") },
  	{ HTTP_VERSION_1_0, CONST_LEN_STR("HTTP/1.0") },
  	{ HTTP_VERSION_UNSET, 0, NULL }
  };
  
  static const keyvalue http_methods[] = {
  	{ HTTP_METHOD_GET,                 CONST_LEN_STR("GET") },
  	{ HTTP_METHOD_HEAD,                CONST_LEN_STR("HEAD") },
  	{ HTTP_METHOD_POST,                CONST_LEN_STR("POST") },
  	{ HTTP_METHOD_PUT,                 CONST_LEN_STR("PUT") },
  	{ HTTP_METHOD_DELETE,              CONST_LEN_STR("DELETE") },
  	{ HTTP_METHOD_CONNECT,             CONST_LEN_STR("CONNECT") },
  	{ HTTP_METHOD_OPTIONS,             CONST_LEN_STR("OPTIONS") },
  	{ HTTP_METHOD_TRACE,               CONST_LEN_STR("TRACE") },
  	{ HTTP_METHOD_ACL,                 CONST_LEN_STR("ACL") },
  	{ HTTP_METHOD_BASELINE_CONTROL,    CONST_LEN_STR("BASELINE-CONTROL") },
  	{ HTTP_METHOD_BIND,                CONST_LEN_STR("BIND") },
  	{ HTTP_METHOD_CHECKIN,             CONST_LEN_STR("CHECKIN") },
  	{ HTTP_METHOD_CHECKOUT,            CONST_LEN_STR("CHECKOUT") },
  	{ HTTP_METHOD_COPY,                CONST_LEN_STR("COPY") },
  	{ HTTP_METHOD_LABEL,               CONST_LEN_STR("LABEL") },
  	{ HTTP_METHOD_LINK,                CONST_LEN_STR("LINK") },
  	{ HTTP_METHOD_LOCK,                CONST_LEN_STR("LOCK") },
  	{ HTTP_METHOD_MERGE,               CONST_LEN_STR("MERGE") },
  	{ HTTP_METHOD_MKACTIVITY,          CONST_LEN_STR("MKACTIVITY") },
  	{ HTTP_METHOD_MKCALENDAR,          CONST_LEN_STR("MKCALENDAR") },
  	{ HTTP_METHOD_MKCOL,               CONST_LEN_STR("MKCOL") },
  	{ HTTP_METHOD_MKREDIRECTREF,       CONST_LEN_STR("MKREDIRECTREF") },
  	{ HTTP_METHOD_MKWORKSPACE,         CONST_LEN_STR("MKWORKSPACE") },
  	{ HTTP_METHOD_MOVE,                CONST_LEN_STR("MOVE") },
  	{ HTTP_METHOD_ORDERPATCH,          CONST_LEN_STR("ORDERPATCH") },
  	{ HTTP_METHOD_PATCH,               CONST_LEN_STR("PATCH") },
  	{ HTTP_METHOD_PROPFIND,            CONST_LEN_STR("PROPFIND") },
  	{ HTTP_METHOD_PROPPATCH,           CONST_LEN_STR("PROPPATCH") },
  	{ HTTP_METHOD_REBIND,              CONST_LEN_STR("REBIND") },
  	{ HTTP_METHOD_REPORT,              CONST_LEN_STR("REPORT") },
  	{ HTTP_METHOD_SEARCH,              CONST_LEN_STR("SEARCH") },
  	{ HTTP_METHOD_UNBIND,              CONST_LEN_STR("UNBIND") },
  	{ HTTP_METHOD_UNCHECKOUT,          CONST_LEN_STR("UNCHECKOUT") },
  	{ HTTP_METHOD_UNLINK,              CONST_LEN_STR("UNLINK") },
  	{ HTTP_METHOD_UNLOCK,              CONST_LEN_STR("UNLOCK") },
  	{ HTTP_METHOD_UPDATE,              CONST_LEN_STR("UPDATE") },
  	{ HTTP_METHOD_UPDATEREDIRECTREF,   CONST_LEN_STR("UPDATEREDIRECTREF") },
  	{ HTTP_METHOD_VERSION_CONTROL,     CONST_LEN_STR("VERSION-CONTROL") },
  
  	{ HTTP_METHOD_UNSET, 0, NULL }
  };
  
  static const keyvalue http_status[] = {
  	{ 100, CONST_LEN_STR("100 Continue") },
  	{ 101, CONST_LEN_STR("101 Switching Protocols") },
  	{ 102, CONST_LEN_STR("102 Processing") }, /* WebDAV */
  	{ 200, CONST_LEN_STR("200 OK") },
  	{ 201, CONST_LEN_STR("201 Created") },
  	{ 202, CONST_LEN_STR("202 Accepted") },
  	{ 203, CONST_LEN_STR("203 Non-Authoritative Information") },
  	{ 204, CONST_LEN_STR("204 No Content") },
  	{ 205, CONST_LEN_STR("205 Reset Content") },
  	{ 206, CONST_LEN_STR("206 Partial Content") },
  	{ 207, CONST_LEN_STR("207 Multi-status") }, /* WebDAV */
  	{ 300, CONST_LEN_STR("300 Multiple Choices") },
  	{ 301, CONST_LEN_STR("301 Moved Permanently") },
  	{ 302, CONST_LEN_STR("302 Found") },
  	{ 303, CONST_LEN_STR("303 See Other") },
  	{ 304, CONST_LEN_STR("304 Not Modified") },
  	{ 305, CONST_LEN_STR("305 Use Proxy") },
  	{ 306, CONST_LEN_STR("306 (Unused)") },
  	{ 307, CONST_LEN_STR("307 Temporary Redirect") },
  	{ 308, CONST_LEN_STR("308 Permanent Redirect") },
  	{ 400, CONST_LEN_STR("400 Bad Request") },
  	{ 401, CONST_LEN_STR("401 Unauthorized") },
  	{ 402, CONST_LEN_STR("402 Payment Required") },
  	{ 403, CONST_LEN_STR("403 Forbidden") },
  	{ 404, CONST_LEN_STR("404 Not Found") },
  	{ 405, CONST_LEN_STR("405 Method Not Allowed") },
  	{ 406, CONST_LEN_STR("406 Not Acceptable") },
  	{ 407, CONST_LEN_STR("407 Proxy Authentication Required") },
  	{ 408, CONST_LEN_STR("408 Request Timeout") },
  	{ 409, CONST_LEN_STR("409 Conflict") },
  	{ 410, CONST_LEN_STR("410 Gone") },
  	{ 411, CONST_LEN_STR("411 Length Required") },
  	{ 412, CONST_LEN_STR("412 Precondition Failed") },
  	{ 413, CONST_LEN_STR("413 Request Entity Too Large") },
  	{ 414, CONST_LEN_STR("414 Request-URI Too Long") },
  	{ 415, CONST_LEN_STR("415 Unsupported Media Type") },
  	{ 416, CONST_LEN_STR("416 Requested Range Not Satisfiable") },
  	{ 417, CONST_LEN_STR("417 Expectation Failed") },
  	{ 422, CONST_LEN_STR("422 Unprocessable Entity") }, /* WebDAV */
  	{ 423, CONST_LEN_STR("423 Locked") }, /* WebDAV */
  	{ 424, CONST_LEN_STR("424 Failed Dependency") }, /* WebDAV */
  	{ 426, CONST_LEN_STR("426 Upgrade Required") }, /* TLS */
  	{ 500, CONST_LEN_STR("500 Internal Server Error") },
  	{ 501, CONST_LEN_STR("501 Not Implemented") },
  	{ 502, CONST_LEN_STR("502 Bad Gateway") },
  	{ 503, CONST_LEN_STR("503 Service Not Available") },
  	{ 504, CONST_LEN_STR("504 Gateway Timeout") },
  	{ 505, CONST_LEN_STR("505 HTTP Version Not Supported") },
  	{ 507, CONST_LEN_STR("507 Insufficient Storage") }, /* WebDAV */
  
  	{ -1, 0, NULL }
  };
  
  
  static const char *keyvalue_get_value(const keyvalue *kv, int k) {
  	int i;
  	for (i = 0; kv[i].value; i++) {
  		if (kv[i].key == k) return kv[i].value;
  	}
  	return NULL;
  }
  
  static int keyvalue_get_key(const keyvalue *kv, const char *s, unsigned int slen) {
  	for (int i = 0; kv[i].vlen; ++i) {
  		if (kv[i].vlen == slen && 0 == memcmp(kv[i].value, s, slen))
  			return kv[i].key;
  	}
  	return -1;
  }
  
  
  const char *get_http_version_name(int i) {
  	return keyvalue_get_value(http_versions, i);
  }
  
  const char *get_http_status_name(int i) {
  	return keyvalue_get_value(http_status, i);
  }
  
  const char *get_http_method_name(http_method_t i) {
  	return keyvalue_get_value(http_methods, i);
  }
  
  int get_http_version_key(const char *s, size_t slen) {
      return keyvalue_get_key(http_versions, s, (unsigned int)slen);
  }
  
  http_method_t get_http_method_key(const char *s, size_t slen) {
      return (http_method_t)keyvalue_get_key(http_methods, s, (unsigned int)slen);
  }
  
  
  void http_status_append(buffer * const b, const int status) {
      if (200 == status) { /*(short-circuit common case)*/
          buffer_append_string_len(b, CONST_STR_LEN("200 OK"));
          return;
      }
  
      const keyvalue * const kv = http_status;
      int i;
      for (i = 0; kv[i].key != status && kv[i].vlen; ++i) ;
      if (kv[i].vlen) {
          buffer_append_string_len(b, kv[i].value, kv[i].vlen);
      }
      else {
          buffer_append_int(b, status);
          buffer_append_string_len(b, CONST_STR_LEN(" "));
      }
  }
  
  void http_method_append(buffer * const b, const http_method_t method) {
      const keyvalue * const kv = http_methods;
      int i;
      for (i = 0; kv[i].key != method && kv[i].vlen; ++i) ;
      if (kv[i].vlen) {
          buffer_append_string_len(b, kv[i].value, kv[i].vlen);
      }
  }
  