Fix buffer OOB error and re-style traffic debug output

lib/imap.js

@@ -161,13 +161,13 @@ ImapConnection.prototype.connect = function(loginCb) {
 
   function read(b) {
     var blen = b.length;
-    if (ondata.expect <= blen) {
+    if (ondata.expect <= (blen - b.p)) {
       var left = ondata.expect, origPos = b.p;
       ondata.expect = 0;
       b.p += left;
       return b.slice(origPos, origPos + left);
     } else {
-      ondata.expect -= blen;
+      ondata.expect -= (blen - b.p);
       b.p = blen;
       return b;
     }
@@ -176,7 +176,7 @@ ImapConnection.prototype.connect = function(loginCb) {
   var ondata = function(b) {
     b.p || (b.p = 0);
     if (b.length === 0 || b.p >= b.length) return;
-    self.debug&&self.debug('\n<-- ' + inspect(b.toString('binary', b.p)) + '\n');
+    self.debug&&self.debug('\n<== ' + inspect(b.toString('binary', b.p)) + '\n');
 
     var r, m, litType;
     if (ondata.expect > 0) {
@@ -761,7 +761,7 @@ ImapConnection.prototype.append = function(data, options, cb) {
       return cb(err);
     self._state.conn.cleartext.write(data);
     self._state.conn.cleartext.write(CRLF);
-    self.debug&&self.debug('\n--> ' + inspect(data.toString()) + '\n');
+    self.debug&&self.debug('\n==> ' + inspect(data.toString()) + '\n');
   });
 };
 
@@ -1168,7 +1168,7 @@ ImapConnection.prototype._send = function(cmdstr, cb, bypass) {
     this._state.conn.cleartext.write(prefix);
     this._state.conn.cleartext.write(cmd);
     this._state.conn.cleartext.write(CRLF);
-    this.debug&&this.debug('\n--> ' + prefix + cmd + '\n');
+    this.debug&&this.debug('\n==> ' + prefix + cmd + '\n');
   }
 };