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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 | |
| from . import Image | |
| from ._binary import i32le as i32 | |
| 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 | |
| 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 | |
| self.frame = frame | |
| self.fp = self._fp | |
| self.fp.seek(self._offset[frame]) | |
| PcxImageFile._open(self) | |
| def tell(self) -> int: | |
| return self.frame | |
| Image.register_open(DcxImageFile.format, DcxImageFile, _accept) | |
| Image.register_extension(DcxImageFile.format, ".dcx") | |