chore(createReadStream): use MAX_READ_LENGTH constant

lib/api/createReadStream.js

@@ -2,9 +2,7 @@ var Readable = require('stream').Readable;
 
 var BigInt = require('../tools/bigint');
 var request = require('../tools/smb2-forge').request;
-
-// Where does it come from?!
-var maxPacketSize = 0x00010000;
+var MAX_READ_LENGTH = require('../structures/constants').MAX_READ_LENGTH;
 
 module.exports = function createReadStream(path, options, cb) {
   if (typeof options === 'function') {
@@ -56,7 +54,7 @@ module.exports = function createReadStream(path, options, cb) {
         'read',
         {
           FileId: file.FileId,
-          Length: Math.min(maxPacketSize, size, end - offset),
+          Length: Math.min(MAX_READ_LENGTH, size, end - offset),
           Offset: new BigInt(8, offset).toBuffer(),
         },
         connection,