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480f6819b5
Some container plugins that could contain images of other formats, such as the ICNS format, did not properly check the reported size of the contained image. These images could cause arbitrariliy large memory allocations. This is fixed for all locations where individual *ImageFile classes are created without going through the usual Image.open method.
330 lines
10 KiB
Python
330 lines
10 KiB
Python
#
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# The Python Imaging Library.
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# $Id$
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#
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# Windows Icon support for PIL
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#
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# History:
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# 96-05-27 fl Created
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#
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# Copyright (c) Secret Labs AB 1997.
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# Copyright (c) Fredrik Lundh 1996.
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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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# This plugin is a refactored version of Win32IconImagePlugin by Bryan Davis
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# <casadebender@gmail.com>.
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# https://code.google.com/archive/p/casadebender/wikis/Win32IconImagePlugin.wiki
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#
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# Icon format references:
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# * https://en.wikipedia.org/wiki/ICO_(file_format)
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# * https://msdn.microsoft.com/en-us/library/ms997538.aspx
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import struct
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import warnings
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from io import BytesIO
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from math import ceil, log
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from . import BmpImagePlugin, Image, ImageFile, PngImagePlugin
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from ._binary import i16le as i16
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from ._binary import i32le as i32
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#
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# --------------------------------------------------------------------
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_MAGIC = b"\0\0\1\0"
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def _save(im, fp, filename):
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fp.write(_MAGIC) # (2+2)
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sizes = im.encoderinfo.get(
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"sizes",
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[(16, 16), (24, 24), (32, 32), (48, 48), (64, 64), (128, 128), (256, 256)],
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)
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width, height = im.size
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sizes = filter(
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lambda x: False
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if (x[0] > width or x[1] > height or x[0] > 256 or x[1] > 256)
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else True,
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sizes,
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)
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sizes = list(sizes)
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fp.write(struct.pack("<H", len(sizes))) # idCount(2)
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offset = fp.tell() + len(sizes) * 16
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provided_images = {im.size: im for im in im.encoderinfo.get("append_images", [])}
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for size in sizes:
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width, height = size
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# 0 means 256
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fp.write(struct.pack("B", width if width < 256 else 0)) # bWidth(1)
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fp.write(struct.pack("B", height if height < 256 else 0)) # bHeight(1)
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fp.write(b"\0") # bColorCount(1)
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fp.write(b"\0") # bReserved(1)
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fp.write(b"\0\0") # wPlanes(2)
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fp.write(struct.pack("<H", 32)) # wBitCount(2)
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image_io = BytesIO()
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tmp = provided_images.get(size)
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if not tmp:
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# TODO: invent a more convenient method for proportional scalings
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tmp = im.copy()
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tmp.thumbnail(size, Image.LANCZOS, reducing_gap=None)
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tmp.save(image_io, "png")
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image_io.seek(0)
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image_bytes = image_io.read()
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bytes_len = len(image_bytes)
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fp.write(struct.pack("<I", bytes_len)) # dwBytesInRes(4)
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fp.write(struct.pack("<I", offset)) # dwImageOffset(4)
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current = fp.tell()
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fp.seek(offset)
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fp.write(image_bytes)
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offset = offset + bytes_len
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fp.seek(current)
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def _accept(prefix):
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return prefix[:4] == _MAGIC
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class IcoFile:
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def __init__(self, buf):
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"""
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Parse image from file-like object containing ico file data
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"""
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# check magic
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s = buf.read(6)
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if not _accept(s):
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raise SyntaxError("not an ICO file")
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self.buf = buf
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self.entry = []
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# Number of items in file
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self.nb_items = i16(s, 4)
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# Get headers for each item
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for i in range(self.nb_items):
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s = buf.read(16)
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icon_header = {
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"width": s[0],
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"height": s[1],
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"nb_color": s[2], # No. of colors in image (0 if >=8bpp)
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"reserved": s[3],
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"planes": i16(s, 4),
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"bpp": i16(s, 6),
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"size": i32(s, 8),
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"offset": i32(s, 12),
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}
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# See Wikipedia
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for j in ("width", "height"):
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if not icon_header[j]:
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icon_header[j] = 256
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# See Wikipedia notes about color depth.
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# We need this just to differ images with equal sizes
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icon_header["color_depth"] = (
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icon_header["bpp"]
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or (
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icon_header["nb_color"] != 0
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and ceil(log(icon_header["nb_color"], 2))
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)
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or 256
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)
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icon_header["dim"] = (icon_header["width"], icon_header["height"])
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icon_header["square"] = icon_header["width"] * icon_header["height"]
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self.entry.append(icon_header)
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self.entry = sorted(self.entry, key=lambda x: x["color_depth"])
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# ICO images are usually squares
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# self.entry = sorted(self.entry, key=lambda x: x['width'])
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self.entry = sorted(self.entry, key=lambda x: x["square"])
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self.entry.reverse()
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def sizes(self):
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"""
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Get a list of all available icon sizes and color depths.
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"""
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return {(h["width"], h["height"]) for h in self.entry}
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def getentryindex(self, size, bpp=False):
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for (i, h) in enumerate(self.entry):
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if size == h["dim"] and (bpp is False or bpp == h["color_depth"]):
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return i
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return 0
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def getimage(self, size, bpp=False):
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"""
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Get an image from the icon
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"""
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return self.frame(self.getentryindex(size, bpp))
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def frame(self, idx):
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"""
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Get an image from frame idx
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"""
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header = self.entry[idx]
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self.buf.seek(header["offset"])
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data = self.buf.read(8)
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self.buf.seek(header["offset"])
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if data[:8] == PngImagePlugin._MAGIC:
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# png frame
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im = PngImagePlugin.PngImageFile(self.buf)
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Image._decompression_bomb_check(im.size)
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else:
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# XOR + AND mask bmp frame
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im = BmpImagePlugin.DibImageFile(self.buf)
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Image._decompression_bomb_check(im.size)
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# change tile dimension to only encompass XOR image
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im._size = (im.size[0], int(im.size[1] / 2))
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d, e, o, a = im.tile[0]
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im.tile[0] = d, (0, 0) + im.size, o, a
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# figure out where AND mask image starts
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mode = a[0]
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bpp = 8
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for k, v in BmpImagePlugin.BIT2MODE.items():
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if mode == v[1]:
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bpp = k
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break
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if 32 == bpp:
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# 32-bit color depth icon image allows semitransparent areas
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# PIL's DIB format ignores transparency bits, recover them.
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# The DIB is packed in BGRX byte order where X is the alpha
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# channel.
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# Back up to start of bmp data
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self.buf.seek(o)
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# extract every 4th byte (eg. 3,7,11,15,...)
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alpha_bytes = self.buf.read(im.size[0] * im.size[1] * 4)[3::4]
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# convert to an 8bpp grayscale image
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mask = Image.frombuffer(
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"L", # 8bpp
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im.size, # (w, h)
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alpha_bytes, # source chars
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"raw", # raw decoder
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("L", 0, -1), # 8bpp inverted, unpadded, reversed
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)
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else:
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# get AND image from end of bitmap
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w = im.size[0]
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if (w % 32) > 0:
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# bitmap row data is aligned to word boundaries
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w += 32 - (im.size[0] % 32)
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# the total mask data is
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# padded row size * height / bits per char
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and_mask_offset = o + int(im.size[0] * im.size[1] * (bpp / 8.0))
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total_bytes = int((w * im.size[1]) / 8)
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self.buf.seek(and_mask_offset)
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mask_data = self.buf.read(total_bytes)
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# convert raw data to image
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mask = Image.frombuffer(
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"1", # 1 bpp
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im.size, # (w, h)
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mask_data, # source chars
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"raw", # raw decoder
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("1;I", int(w / 8), -1), # 1bpp inverted, padded, reversed
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)
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# now we have two images, im is XOR image and mask is AND image
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# apply mask image as alpha channel
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im = im.convert("RGBA")
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im.putalpha(mask)
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return im
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##
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# Image plugin for Windows Icon files.
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class IcoImageFile(ImageFile.ImageFile):
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"""
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PIL read-only image support for Microsoft Windows .ico files.
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By default the largest resolution image in the file will be loaded. This
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can be changed by altering the 'size' attribute before calling 'load'.
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The info dictionary has a key 'sizes' that is a list of the sizes available
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in the icon file.
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Handles classic, XP and Vista icon formats.
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When saving, PNG compression is used. Support for this was only added in
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Windows Vista.
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This plugin is a refactored version of Win32IconImagePlugin by Bryan Davis
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<casadebender@gmail.com>.
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https://code.google.com/archive/p/casadebender/wikis/Win32IconImagePlugin.wiki
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"""
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format = "ICO"
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format_description = "Windows Icon"
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def _open(self):
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self.ico = IcoFile(self.fp)
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self.info["sizes"] = self.ico.sizes()
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self.size = self.ico.entry[0]["dim"]
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self.load()
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@property
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def size(self):
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return self._size
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@size.setter
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def size(self, value):
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if value not in self.info["sizes"]:
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raise ValueError("This is not one of the allowed sizes of this image")
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self._size = value
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def load(self):
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if self.im and self.im.size == self.size:
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# Already loaded
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return
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im = self.ico.getimage(self.size)
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# if tile is PNG, it won't really be loaded yet
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im.load()
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self.im = im.im
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self.mode = im.mode
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if im.size != self.size:
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warnings.warn("Image was not the expected size")
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index = self.ico.getentryindex(self.size)
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sizes = list(self.info["sizes"])
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sizes[index] = im.size
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self.info["sizes"] = set(sizes)
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self.size = im.size
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def load_seek(self):
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# Flag the ImageFile.Parser so that it
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# just does all the decode at the end.
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pass
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#
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# --------------------------------------------------------------------
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Image.register_open(IcoImageFile.format, IcoImageFile, _accept)
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Image.register_save(IcoImageFile.format, _save)
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Image.register_extension(IcoImageFile.format, ".ico")
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Image.register_mime(IcoImageFile.format, "image/x-icon")
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