Use string.indexOf() since we already have a stringified version of the response chunk

lib/imap.js

@@ -16,7 +16,7 @@ var CRLF = '\r\n',
       BOXSELECTED: 4
     },
     BOX_ATTRIBS = ['NOINFERIORS', 'NOSELECT', 'MARKED', 'UNMARKED'],
-    RE_FETCH = /^\* (\d+) FETCH .+? \{(\d+)\}\r\n/;
+    REGEXP_FETCH = /^\* (\d+) FETCH .+? \{(\d+)\}\r\n/;
 
 // extension constants
 var IDLE_NONE = 1,
@@ -239,15 +239,14 @@ ImapConnection.prototype.connect = function(loginCb) {
           return;
       } else
         return;
-    } else if (self._state.curExpected === 0
-               && (literalInfo = (strdata = data.toString()).match(RE_FETCH))) {
+    } else if (self._state.curExpected === 0 &&
+               (literalInfo = (strdata = data.toString()).match(REGEXP_FETCH))) {
       self._state.curExpected = parseInt(literalInfo[2], 10);
-      var idxCRLF = utils.bufferIndexOf(data, CRLF),
+      var idxCRLF = strdata.indexOf(CRLF),
           curReq = self._state.requests[0],
           type = /BODY\[(.*)\](?:\<\d+\>)?/.exec(strdata.substring(0, idxCRLF)),
           msg = new ImapMessage(),
-          desc = strdata.substring(utils.bufferIndexOf(data, '(') + 1, idxCRLF)
-                        .trim();
+          desc = strdata.substring(strdata.indexOf('(') + 1, idxCRLF).trim();
       msg.seqno = parseInt(literalInfo[1], 10);
       type = type[1];
       curReq._desc = desc;