Update to NPM version

ProjectSourceCode/node_modules/charset/index.js

@@ -0,0 +1,59 @@
+'use strict';
+
+const CHARTSET_RE = /(?:charset|encoding)\s{0,10}=\s{0,10}['"]? {0,10}([\w\-]{1,100})/i;
+
+module.exports = charset;
+
+/**
+ * guest data charset from req.headers, xml, html content-type meta tag
+ * headers:
+ *  'content-type': 'text/html;charset=gbk'
+ * meta tag:
+ *  <meta http-equiv="Content-Type" content="text/html; charset=xxxx"/>
+ * xml file:
+ *  <?xml version="1.0" encoding="UTF-8"?>
+ *
+ * @param {Object} obj `Content-Type` String, or `res.headers`, or `res` Object
+ * @param {Buffer} [data] content buffer
+ * @param {Number} [peekSize] max content peek size, default is 512
+ * @return {String} charset, lower case, e.g.: utf8, gbk, gb2312, ....
+ *  If can\'t guest, return null
+ * @api public
+ */
+function charset(obj, data, peekSize) {
+  let matchs = null;
+  let end = 0;
+  if (data) {
+    peekSize = peekSize || 512;
+    // https://github.com/node-modules/charset/issues/4
+    end = data.length > peekSize ? peekSize : data.length;
+  }
+  // charset('text/html;charset=gbk')
+  let contentType = obj;
+  if (contentType && typeof contentType !== 'string') {
+    // charset(res.headers)
+    let headers = obj;
+    if (obj.headers) {
+      // charset(res)
+      headers = obj.headers;
+    }
+    contentType = headers['content-type'] || headers['Content-Type'];
+  }
+  if (contentType) {
+    // guest from obj first
+    matchs = CHARTSET_RE.exec(contentType);
+  }
+  if (!matchs && end > 0) {
+    // guest from content body (html/xml) header
+    contentType = data.slice(0, end).toString();
+    matchs = CHARTSET_RE.exec(contentType);
+  }
+  let cs = null;
+  if (matchs) {
+    cs = matchs[1].toLowerCase();
+    if (cs === 'utf-8') {
+      cs = 'utf8';
+    }
+  }
+  return cs;
+}