"""
All errors/exceptions pypdf raises and all of the warnings it uses.

Please note that broken PDF files might cause other Exceptions.
"""


class DeprecationError(Exception):
    """Raised when a deprecated feature is used."""


class DependencyError(Exception):
    """
    Raised when a required dependency (a library or module that PyPDF depends on)
    is not available or cannot be imported.
    """


class PyPdfError(Exception):
    """Base class for all exceptions raised by PyPDF."""


class PdfReadError(PyPdfError):
    """Raised when there is an issue reading a PDF file."""


class PageSizeNotDefinedError(PyPdfError):
    """Raised when the page size of a PDF document is not defined."""


class PdfReadWarning(UserWarning):
    """Issued when there is a potential issue reading a PDF file, but it can still be read."""


class PdfStreamError(PdfReadError):
    """Raised when there is an issue reading the stream of data in a PDF file."""


class ParseError(PyPdfError):
    """
    Raised when there is an issue parsing (analyzing and understanding the
    structure and meaning of) a PDF file.
    """


class FileNotDecryptedError(PdfReadError):
    """
    Raised when a PDF file that has been encrypted
    (meaning it requires a password to be accessed) has not been successfully
    decrypted.
    """


class WrongPasswordError(FileNotDecryptedError):
    """Raised when the wrong password is used to try to decrypt an encrypted PDF file."""


class EmptyFileError(PdfReadError):
    """Raised when a PDF file is empty or has no content."""


STREAM_TRUNCATED_PREMATURELY = "Stream has ended unexpectedly"