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venv/lib/python3.11/site-packages/PIL/IptcImagePlugin.py

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