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228 lines
6.1 KiB
228 lines
6.1 KiB
5 months ago
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#
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# The Python Imaging Library.
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# $Id$
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#
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# PCX file handling
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#
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# This format was originally used by ZSoft's popular PaintBrush
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# program for the IBM PC. It is also supported by many MS-DOS and
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# Windows applications, including the Windows PaintBrush program in
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# Windows 3.
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#
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# history:
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# 1995-09-01 fl Created
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# 1996-05-20 fl Fixed RGB support
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# 1997-01-03 fl Fixed 2-bit and 4-bit support
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# 1999-02-03 fl Fixed 8-bit support (broken in 1.0b1)
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# 1999-02-07 fl Added write support
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# 2002-06-09 fl Made 2-bit and 4-bit support a bit more robust
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# 2002-07-30 fl Seek from to current position, not beginning of file
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# 2003-06-03 fl Extract DPI settings (info["dpi"])
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#
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# Copyright (c) 1997-2003 by Secret Labs AB.
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# Copyright (c) 1995-2003 by Fredrik Lundh.
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#
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# See the README file for information on usage and redistribution.
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#
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from __future__ import annotations
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import io
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import logging
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from typing import IO
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from . import Image, ImageFile, ImagePalette
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from ._binary import i16le as i16
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from ._binary import o8
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from ._binary import o16le as o16
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logger = logging.getLogger(__name__)
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def _accept(prefix: bytes) -> bool:
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return prefix[0] == 10 and prefix[1] in [0, 2, 3, 5]
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##
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# Image plugin for Paintbrush images.
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class PcxImageFile(ImageFile.ImageFile):
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format = "PCX"
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format_description = "Paintbrush"
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def _open(self) -> None:
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# header
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assert self.fp is not None
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s = self.fp.read(128)
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if not _accept(s):
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msg = "not a PCX file"
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raise SyntaxError(msg)
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# image
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bbox = i16(s, 4), i16(s, 6), i16(s, 8) + 1, i16(s, 10) + 1
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if bbox[2] <= bbox[0] or bbox[3] <= bbox[1]:
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msg = "bad PCX image size"
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raise SyntaxError(msg)
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logger.debug("BBox: %s %s %s %s", *bbox)
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# format
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version = s[1]
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bits = s[3]
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planes = s[65]
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provided_stride = i16(s, 66)
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logger.debug(
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"PCX version %s, bits %s, planes %s, stride %s",
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version,
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bits,
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planes,
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provided_stride,
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)
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self.info["dpi"] = i16(s, 12), i16(s, 14)
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if bits == 1 and planes == 1:
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mode = rawmode = "1"
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elif bits == 1 and planes in (2, 4):
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mode = "P"
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rawmode = "P;%dL" % planes
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self.palette = ImagePalette.raw("RGB", s[16:64])
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elif version == 5 and bits == 8 and planes == 1:
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mode = rawmode = "L"
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# FIXME: hey, this doesn't work with the incremental loader !!!
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self.fp.seek(-769, io.SEEK_END)
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s = self.fp.read(769)
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if len(s) == 769 and s[0] == 12:
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# check if the palette is linear grayscale
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for i in range(256):
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if s[i * 3 + 1 : i * 3 + 4] != o8(i) * 3:
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mode = rawmode = "P"
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break
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if mode == "P":
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self.palette = ImagePalette.raw("RGB", s[1:])
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self.fp.seek(128)
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elif version == 5 and bits == 8 and planes == 3:
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mode = "RGB"
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rawmode = "RGB;L"
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else:
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msg = "unknown PCX mode"
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raise OSError(msg)
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self._mode = mode
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self._size = bbox[2] - bbox[0], bbox[3] - bbox[1]
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# Don't trust the passed in stride.
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# Calculate the approximate position for ourselves.
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# CVE-2020-35653
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stride = (self._size[0] * bits + 7) // 8
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# While the specification states that this must be even,
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# not all images follow this
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if provided_stride != stride:
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stride += stride % 2
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bbox = (0, 0) + self.size
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logger.debug("size: %sx%s", *self.size)
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self.tile = [("pcx", bbox, self.fp.tell(), (rawmode, planes * stride))]
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# --------------------------------------------------------------------
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# save PCX files
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SAVE = {
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# mode: (version, bits, planes, raw mode)
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"1": (2, 1, 1, "1"),
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"L": (5, 8, 1, "L"),
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"P": (5, 8, 1, "P"),
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"RGB": (5, 8, 3, "RGB;L"),
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}
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def _save(im: Image.Image, fp: IO[bytes], filename: str) -> None:
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try:
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version, bits, planes, rawmode = SAVE[im.mode]
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except KeyError as e:
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msg = f"Cannot save {im.mode} images as PCX"
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raise ValueError(msg) from e
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# bytes per plane
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stride = (im.size[0] * bits + 7) // 8
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# stride should be even
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stride += stride % 2
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# Stride needs to be kept in sync with the PcxEncode.c version.
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# Ideally it should be passed in in the state, but the bytes value
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# gets overwritten.
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logger.debug(
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"PcxImagePlugin._save: xwidth: %d, bits: %d, stride: %d",
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im.size[0],
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bits,
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stride,
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)
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# under windows, we could determine the current screen size with
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# "Image.core.display_mode()[1]", but I think that's overkill...
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screen = im.size
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dpi = 100, 100
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# PCX header
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fp.write(
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o8(10)
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+ o8(version)
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+ o8(1)
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+ o8(bits)
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+ o16(0)
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+ o16(0)
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+ o16(im.size[0] - 1)
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+ o16(im.size[1] - 1)
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+ o16(dpi[0])
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+ o16(dpi[1])
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+ b"\0" * 24
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+ b"\xFF" * 24
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+ b"\0"
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+ o8(planes)
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+ o16(stride)
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+ o16(1)
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+ o16(screen[0])
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+ o16(screen[1])
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+ b"\0" * 54
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)
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assert fp.tell() == 128
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ImageFile._save(im, fp, [("pcx", (0, 0) + im.size, 0, (rawmode, bits * planes))])
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if im.mode == "P":
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# colour palette
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assert im.im is not None
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fp.write(o8(12))
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palette = im.im.getpalette("RGB", "RGB")
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palette += b"\x00" * (768 - len(palette))
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fp.write(palette) # 768 bytes
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elif im.mode == "L":
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# grayscale palette
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fp.write(o8(12))
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for i in range(256):
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fp.write(o8(i) * 3)
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# --------------------------------------------------------------------
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# registry
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Image.register_open(PcxImageFile.format, PcxImageFile, _accept)
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Image.register_save(PcxImageFile.format, _save)
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Image.register_extension(PcxImageFile.format, ".pcx")
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Image.register_mime(PcxImageFile.format, "image/x-pcx")
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