236 lines
6.0 KiB
Python
236 lines
6.0 KiB
Python
#
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# The Python Imaging Library.
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# $Id$
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#
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# IPTC/NAA file handling
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#
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# history:
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# 1995-10-01 fl Created
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# 1998-03-09 fl Cleaned up and added to PIL
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# 2002-06-18 fl Added getiptcinfo helper
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#
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# Copyright (c) Secret Labs AB 1997-2002.
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# Copyright (c) Fredrik Lundh 1995.
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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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from io import BytesIO
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from typing import Sequence
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from . import Image, ImageFile
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from ._binary import i16be as i16
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from ._binary import i32be as i32
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from ._deprecate import deprecate
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COMPRESSION = {1: "raw", 5: "jpeg"}
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def __getattr__(name: str) -> bytes:
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if name == "PAD":
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deprecate("IptcImagePlugin.PAD", 12)
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return b"\0\0\0\0"
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msg = f"module '{__name__}' has no attribute '{name}'"
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raise AttributeError(msg)
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#
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# Helpers
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def _i(c: bytes) -> int:
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return i32((b"\0\0\0\0" + c)[-4:])
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def _i8(c: int | bytes) -> int:
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return c if isinstance(c, int) else c[0]
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def i(c: bytes) -> int:
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""".. deprecated:: 10.2.0"""
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deprecate("IptcImagePlugin.i", 12)
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return _i(c)
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def dump(c: Sequence[int | bytes]) -> None:
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""".. deprecated:: 10.2.0"""
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deprecate("IptcImagePlugin.dump", 12)
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for i in c:
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print(f"{_i8(i):02x}", end=" ")
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print()
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##
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# Image plugin for IPTC/NAA datastreams. To read IPTC/NAA fields
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# from TIFF and JPEG files, use the <b>getiptcinfo</b> function.
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class IptcImageFile(ImageFile.ImageFile):
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format = "IPTC"
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format_description = "IPTC/NAA"
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def getint(self, key: tuple[int, int]) -> int:
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return _i(self.info[key])
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def field(self) -> tuple[tuple[int, int] | None, int]:
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#
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# get a IPTC field header
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s = self.fp.read(5)
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if not s.strip(b"\x00"):
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return None, 0
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tag = s[1], s[2]
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# syntax
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if s[0] != 0x1C or tag[0] not in [1, 2, 3, 4, 5, 6, 7, 8, 9, 240]:
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msg = "invalid IPTC/NAA file"
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raise SyntaxError(msg)
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# field size
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size = s[3]
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if size > 132:
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msg = "illegal field length in IPTC/NAA file"
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raise OSError(msg)
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elif size == 128:
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size = 0
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elif size > 128:
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size = _i(self.fp.read(size - 128))
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else:
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size = i16(s, 3)
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return tag, size
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def _open(self) -> None:
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# load descriptive fields
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while True:
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offset = self.fp.tell()
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tag, size = self.field()
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if not tag or tag == (8, 10):
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break
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if size:
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tagdata = self.fp.read(size)
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else:
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tagdata = None
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if tag in self.info:
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if isinstance(self.info[tag], list):
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self.info[tag].append(tagdata)
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else:
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self.info[tag] = [self.info[tag], tagdata]
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else:
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self.info[tag] = tagdata
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# mode
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layers = self.info[(3, 60)][0]
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component = self.info[(3, 60)][1]
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if (3, 65) in self.info:
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id = self.info[(3, 65)][0] - 1
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else:
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id = 0
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if layers == 1 and not component:
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self._mode = "L"
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elif layers == 3 and component:
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self._mode = "RGB"[id]
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elif layers == 4 and component:
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self._mode = "CMYK"[id]
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# size
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self._size = self.getint((3, 20)), self.getint((3, 30))
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# compression
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try:
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compression = COMPRESSION[self.getint((3, 120))]
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except KeyError as e:
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msg = "Unknown IPTC image compression"
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raise OSError(msg) from e
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# tile
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if tag == (8, 10):
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self.tile = [("iptc", (0, 0) + self.size, offset, compression)]
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def load(self):
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if len(self.tile) != 1 or self.tile[0][0] != "iptc":
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return ImageFile.ImageFile.load(self)
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offset, compression = self.tile[0][2:]
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self.fp.seek(offset)
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# Copy image data to temporary file
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o = BytesIO()
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if compression == "raw":
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# To simplify access to the extracted file,
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# prepend a PPM header
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o.write(b"P5\n%d %d\n255\n" % self.size)
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while True:
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type, size = self.field()
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if type != (8, 10):
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break
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while size > 0:
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s = self.fp.read(min(size, 8192))
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if not s:
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break
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o.write(s)
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size -= len(s)
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with Image.open(o) as _im:
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_im.load()
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self.im = _im.im
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Image.register_open(IptcImageFile.format, IptcImageFile)
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Image.register_extension(IptcImageFile.format, ".iim")
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def getiptcinfo(im):
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"""
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Get IPTC information from TIFF, JPEG, or IPTC file.
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:param im: An image containing IPTC data.
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:returns: A dictionary containing IPTC information, or None if
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no IPTC information block was found.
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"""
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from . import JpegImagePlugin, TiffImagePlugin
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data = None
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if isinstance(im, IptcImageFile):
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# return info dictionary right away
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return im.info
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elif isinstance(im, JpegImagePlugin.JpegImageFile):
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# extract the IPTC/NAA resource
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photoshop = im.info.get("photoshop")
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if photoshop:
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data = photoshop.get(0x0404)
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elif isinstance(im, TiffImagePlugin.TiffImageFile):
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# get raw data from the IPTC/NAA tag (PhotoShop tags the data
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# as 4-byte integers, so we cannot use the get method...)
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try:
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data = im.tag.tagdata[TiffImagePlugin.IPTC_NAA_CHUNK]
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except (AttributeError, KeyError):
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pass
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if data is None:
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return None # no properties
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# create an IptcImagePlugin object without initializing it
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class FakeImage:
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pass
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im = FakeImage()
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im.__class__ = IptcImageFile
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# parse the IPTC information chunk
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im.info = {}
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im.fp = BytesIO(data)
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try:
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im._open()
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except (IndexError, KeyError):
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pass # expected failure
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return im.info
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