class FormParserError(ValueError):
    """Base error class for our form parser."""


class ParseError(FormParserError):
    """This exception (or a subclass) is raised when there is an error while
    parsing something.
    """

    #: This is the offset in the input data chunk (*NOT* the overall stream) in
    #: which the parse error occurred.  It will be -1 if not specified.
    offset = -1


class MultipartParseError(ParseError):
    """This is a specific error that is raised when the MultipartParser detects
    an error while parsing.
    """


class QuerystringParseError(ParseError):
    """This is a specific error that is raised when the QuerystringParser
    detects an error while parsing.
    """


class DecodeError(ParseError):
    """This exception is raised when there is a decoding error - for example
    with the Base64Decoder or QuotedPrintableDecoder.
    """


class FileError(FormParserError, OSError):
    """Exception class for problems with the File class."""