Located in File: /vendors/swiftMailer/classes/Swift/CharacterReader/Utf8Reader.php
Method getCharPositions (line 87)
Method getInitialByteSize (line 178)
Method getMapType (line 148)
Method validateByteSequence (line 162)
A positive integer indicates the number of more bytes to fetch before invoking this method again. A value of zero means this is already a valid character. A value of -1 means this cannot possibly be a valid character.