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#
# The Python Imaging Library.
# $Id$
#
# DCX file handling
#
# DCX is a container file format defined by Intel, commonly used
# for fax applications.  Each DCX file consists of a directory
# (a list of file offsets) followed by a set of (usually 1-bit)
# PCX files.
#
# History:
# 1995-09-09 fl   Created
# 1996-03-20 fl   Properly derived from PcxImageFile.
# 1998-07-15 fl   Renamed offset attribute to avoid name clash
# 2002-07-30 fl   Fixed file handling
#
# Copyright (c) 1997-98 by Secret Labs AB.
# Copyright (c) 1995-96 by Fredrik Lundh.
#
# See the README file for information on usage and redistribution.
#
from __future__ import annotations

__lazy_modules__ = {"PIL._binary", "PIL._util"}

from . import Image
from ._binary import i32le as i32
from ._util import DeferredError
from .PcxImagePlugin import PcxImageFile

MAGIC = 0x3ADE68B1  # QUIZ: what's this value, then?


def _accept(prefix: bytes) -> bool:
    return len(prefix) >= 4 and i32(prefix) == MAGIC


##
# Image plugin for the Intel DCX format.


class DcxImageFile(PcxImageFile):
    format = "DCX"
    format_description = "Intel DCX"
    _close_exclusive_fp_after_loading = False

    def _open(self) -> None:
        # Header
        assert self.fp is not None
        s = self.fp.read(4)
        if not _accept(s):
            msg = "not a DCX file"
            raise SyntaxError(msg)

        # Component directory
        self._offset = []
        for i in range(1024):
            offset = i32(self.fp.read(4))
            if not offset:
                break
            self._offset.append(offset)

        self._fp = self.fp
        self.frame = -1
        self.n_frames = len(self._offset)
        self.is_animated = self.n_frames > 1
        self.seek(0)

    def seek(self, frame: int) -> None:
        if not self._seek_check(frame):
            return
        if isinstance(self._fp, DeferredError):
            raise self._fp.ex
        self.frame = frame
        self.fp = self._fp
        self.fp.seek(self._offset[frame])
        PcxImageFile._open(self)
        Image._decompression_bomb_check(self.size)
        Image.Image.seek(self, frame)

    def tell(self) -> int:
        return self.frame


Image.register_open(DcxImageFile.format, DcxImageFile, _accept)

Image.register_extension(DcxImageFile.format, ".dcx")

	#
	# The Python Imaging Library.
	# $Id$
	#
	# DCX file handling
	#
	# DCX is a container file format defined by Intel, commonly used
	# for fax applications. Each DCX file consists of a directory
	# (a list of file offsets) followed by a set of (usually 1-bit)
	# PCX files.
	#
	# History:
	# 1995-09-09 fl Created
	# 1996-03-20 fl Properly derived from PcxImageFile.
	# 1998-07-15 fl Renamed offset attribute to avoid name clash
	# 2002-07-30 fl Fixed file handling
	#
	# Copyright (c) 1997-98 by Secret Labs AB.
	# Copyright (c) 1995-96 by Fredrik Lundh.
	#
	# See the README file for information on usage and redistribution.
	#
	from __future__ import annotations

	__lazy_modules__ = {"PIL._binary", "PIL._util"}

	from . import Image
	from ._binary import i32le as i32
	from ._util import DeferredError
	from .PcxImagePlugin import PcxImageFile

	MAGIC = 0x3ADE68B1 # QUIZ: what's this value, then?


	def _accept(prefix: bytes) -> bool:
	return len(prefix) >= 4 and i32(prefix) == MAGIC


	##
	# Image plugin for the Intel DCX format.


	class DcxImageFile(PcxImageFile):
	format = "DCX"
	format_description = "Intel DCX"
	_close_exclusive_fp_after_loading = False

	def _open(self) -> None:
	# Header
	assert self.fp is not None
	s = self.fp.read(4)
	if not _accept(s):
	msg = "not a DCX file"
	raise SyntaxError(msg)

	# Component directory
	self._offset = []
	for i in range(1024):
	offset = i32(self.fp.read(4))
	if not offset:
	break
	self._offset.append(offset)

	self._fp = self.fp
	self.frame = -1
	self.n_frames = len(self._offset)
	self.is_animated = self.n_frames > 1
	self.seek(0)

	def seek(self, frame: int) -> None:
	if not self._seek_check(frame):
	return
	if isinstance(self._fp, DeferredError):
	raise self._fp.ex
	self.frame = frame
	self.fp = self._fp
	self.fp.seek(self._offset[frame])
	PcxImageFile._open(self)
	Image._decompression_bomb_check(self.size)
	Image.Image.seek(self, frame)

	def tell(self) -> int:
	return self.frame


	Image.register_open(DcxImageFile.format, DcxImageFile, _accept)

	Image.register_extension(DcxImageFile.format, ".dcx")