prosody
21311bd31f6b
util/xmppstream.lua

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util/xmppstream.lua @ 4010:21311bd31f6b

storagemanager: Add new "null" provider to get used when loading a driver or opening a store fails, instead of falling back to the default driver
author Matthew Wild <mwild1@gmail.com>
date Thu, 06 Jan 2011 13:56:39 +0000
parent 3987:8fbf57722368
child 4274:7cc426988bcc
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1 -- Prosody IM
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2 -- Copyright (C) 2008-2010 Matthew Wild
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3 -- Copyright (C) 2008-2010 Waqas Hussain
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4 --
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b1885732e979 GPL->MIT!
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5 -- This project is MIT/X11 licensed. Please see the
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6 -- COPYING file in the source package for more information.
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7 --
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8
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9
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10 local lxp = require "lxp";
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11 local st = require "util.stanza";
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12 local stanza_mt = st.stanza_mt;
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14 local tostring = tostring;
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15 local t_insert = table.insert;
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16 local t_concat = table.concat;
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17 local t_remove = table.remove;
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18 local setmetatable = setmetatable;
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19
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20 local default_log = require "util.logger".init("xmppstream");
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21
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22 local error = error;
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23
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24 module "xmppstream"
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25
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26 local new_parser = lxp.new;
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27
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28 local ns_prefixes = {
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29 ["http://www.w3.org/XML/1998/namespace"] = "xml";
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30 };
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32 local xmlns_streams = "http://etherx.jabber.org/streams";
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33
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34 local ns_separator = "\1";
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35 local ns_pattern = "^([^"..ns_separator.."]*)"..ns_separator.."?(.*)$";
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37 _M.ns_separator = ns_separator;
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38 _M.ns_pattern = ns_pattern;
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39
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40 function new_sax_handlers(session, stream_callbacks)
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41 local xml_handlers = {};
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42
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43 local log = session.log or default_log;
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44
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45 local cb_streamopened = stream_callbacks.streamopened;
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46 local cb_streamclosed = stream_callbacks.streamclosed;
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47 local cb_error = stream_callbacks.error or function(session, e) error("XML stream error: "..tostring(e)); end;
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48 local cb_handlestanza = stream_callbacks.handlestanza;
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49
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50 local stream_ns = stream_callbacks.stream_ns or xmlns_streams;
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51 local stream_tag = stream_callbacks.stream_tag or "stream";
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52 if stream_ns ~= "" then
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53 stream_tag = stream_ns..ns_separator..stream_tag;
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54 end
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55 local stream_error_tag = stream_ns..ns_separator..(stream_callbacks.error_tag or "error");
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56
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57 local stream_default_ns = stream_callbacks.default_ns;
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58
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59 local stack = {};
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60 local chardata, stanza = {};
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61 local non_streamns_depth = 0;
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62 function xml_handlers:StartElement(tagname, attr)
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63 if stanza and #chardata > 0 then
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64 -- We have some character data in the buffer
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65 t_insert(stanza, t_concat(chardata));
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66 chardata = {};
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67 end
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68 local curr_ns,name = tagname:match(ns_pattern);
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69 if name == "" then
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70 curr_ns, name = "", curr_ns;
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71 end
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72
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73 if curr_ns ~= stream_default_ns or non_streamns_depth > 0 then
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74 attr.xmlns = curr_ns;
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75 non_streamns_depth = non_streamns_depth + 1;
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76 end
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77
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78 -- FIXME !!!!!
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79 for i=1,#attr do
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80 local k = attr[i];
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81 attr[i] = nil;
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82 local ns, nm = k:match(ns_pattern);
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83 if nm ~= "" then
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84 ns = ns_prefixes[ns];
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85 if ns then
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86 attr[ns..":"..nm] = attr[k];
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87 attr[k] = nil;
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88 end
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89 end
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90 end
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91
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92 if not stanza then --if we are not currently inside a stanza
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93 if session.notopen then
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94 if tagname == stream_tag then
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95 non_streamns_depth = 0;
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96 if cb_streamopened then
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97 cb_streamopened(session, attr);
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98 end
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99 else
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100 -- Garbage before stream?
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101 cb_error(session, "no-stream");
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102 end
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103 return;
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104 end
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105 if curr_ns == "jabber:client" and name ~= "iq" and name ~= "presence" and name ~= "message" then
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106 cb_error(session, "invalid-top-level-element");
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107 end
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108
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109 stanza = setmetatable({ name = name, attr = attr, tags = {} }, stanza_mt);
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110 else -- we are inside a stanza, so add a tag
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111 t_insert(stack, stanza);
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112 local oldstanza = stanza;
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113 stanza = setmetatable({ name = name, attr = attr, tags = {} }, stanza_mt);
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114 t_insert(oldstanza, stanza);
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115 t_insert(oldstanza.tags, stanza);
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116 end
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117 end
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118 function xml_handlers:CharacterData(data)
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119 if stanza then
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120 t_insert(chardata, data);
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121 end
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122 end
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123 function xml_handlers:EndElement(tagname)
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124 if non_streamns_depth > 0 then
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125 non_streamns_depth = non_streamns_depth - 1;
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126 end
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127 if stanza then
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128 if #chardata > 0 then
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129 -- We have some character data in the buffer
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130 t_insert(stanza, t_concat(chardata));
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131 chardata = {};
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132 end
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133 -- Complete stanza
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134 if #stack == 0 then
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135 if tagname ~= stream_error_tag then
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136 cb_handlestanza(session, stanza);
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137 else
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138 cb_error(session, "stream-error", stanza);
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139 end
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140 stanza = nil;
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141 else
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142 stanza = t_remove(stack);
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143 end
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144 else
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145 if tagname == stream_tag then
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146 if cb_streamclosed then
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147 cb_streamclosed(session);
148
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148 end
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149 else
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150 local curr_ns,name = tagname:match(ns_pattern);
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151 if name == "" then
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152 curr_ns, name = "", curr_ns;
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153 end
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154 cb_error(session, "parse-error", "unexpected-element-close", name);
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155 end
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156 stanza, chardata = nil, {};
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157 stack = {};
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158 end
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159 end
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160
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161 local function reset()
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162 stanza, chardata = nil, {};
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163 stack = {};
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164 end
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165
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166 local function set_session(stream, new_session)
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167 session = new_session;
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168 log = new_session.log or default_log;
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169 end
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170
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171 return xml_handlers, { reset = reset, set_session = set_session };
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172 end
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173
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174 function new(session, stream_callbacks)
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175 local handlers, meta = new_sax_handlers(session, stream_callbacks);
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176 local parser = new_parser(handlers, ns_separator);
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177 local parse = parser.parse;
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178
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179 return {
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180 reset = function ()
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181 parser = new_parser(handlers, ns_separator);
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182 parse = parser.parse;
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183 meta.reset();
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184 end,
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185 feed = function (self, data)
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186 return parse(parser, data);
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187 end,
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188 set_session = meta.set_session;
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189 };
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190 end
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191
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192 return _M;