/
TiffImagePlugin.py
1504 lines (1257 loc) · 52.9 KB
/
TiffImagePlugin.py
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#
# The Python Imaging Library.
# $Id$
#
# TIFF file handling
#
# TIFF is a flexible, if somewhat aged, image file format originally
# defined by Aldus. Although TIFF supports a wide variety of pixel
# layouts and compression methods, the name doesn't really stand for
# "thousands of incompatible file formats," it just feels that way.
#
# To read TIFF data from a stream, the stream must be seekable. For
# progressive decoding, make sure to use TIFF files where the tag
# directory is placed first in the file.
#
# History:
# 1995-09-01 fl Created
# 1996-05-04 fl Handle JPEGTABLES tag
# 1996-05-18 fl Fixed COLORMAP support
# 1997-01-05 fl Fixed PREDICTOR support
# 1997-08-27 fl Added support for rational tags (from Perry Stoll)
# 1998-01-10 fl Fixed seek/tell (from Jan Blom)
# 1998-07-15 fl Use private names for internal variables
# 1999-06-13 fl Rewritten for PIL 1.0 (1.0)
# 2000-10-11 fl Additional fixes for Python 2.0 (1.1)
# 2001-04-17 fl Fixed rewind support (seek to frame 0) (1.2)
# 2001-05-12 fl Added write support for more tags (from Greg Couch) (1.3)
# 2001-12-18 fl Added workaround for broken Matrox library
# 2002-01-18 fl Don't mess up if photometric tag is missing (D. Alan Stewart)
# 2003-05-19 fl Check FILLORDER tag
# 2003-09-26 fl Added RGBa support
# 2004-02-24 fl Added DPI support; fixed rational write support
# 2005-02-07 fl Added workaround for broken Corel Draw 10 files
# 2006-01-09 fl Added support for float/double tags (from Russell Nelson)
#
# Copyright (c) 1997-2006 by Secret Labs AB. All rights reserved.
# Copyright (c) 1995-1997 by Fredrik Lundh
#
# See the README file for information on usage and redistribution.
#
from __future__ import division, print_function
from PIL import Image, ImageFile
from PIL import ImagePalette
from PIL import _binary
from PIL import TiffTags
import collections
from fractions import Fraction
from numbers import Number, Rational
import io
import itertools
import os
import struct
import sys
import warnings
from .TiffTags import TYPES
__version__ = "1.3.5"
DEBUG = False # Needs to be merged with the new logging approach.
# Set these to true to force use of libtiff for reading or writing.
READ_LIBTIFF = False
WRITE_LIBTIFF = False
IFD_LEGACY_API = True
II = b"II" # little-endian (Intel style)
MM = b"MM" # big-endian (Motorola style)
i8 = _binary.i8
o8 = _binary.o8
#
# --------------------------------------------------------------------
# Read TIFF files
# a few tag names, just to make the code below a bit more readable
IMAGEWIDTH = 256
IMAGELENGTH = 257
BITSPERSAMPLE = 258
COMPRESSION = 259
PHOTOMETRIC_INTERPRETATION = 262
FILLORDER = 266
IMAGEDESCRIPTION = 270
STRIPOFFSETS = 273
SAMPLESPERPIXEL = 277
ROWSPERSTRIP = 278
STRIPBYTECOUNTS = 279
X_RESOLUTION = 282
Y_RESOLUTION = 283
PLANAR_CONFIGURATION = 284
RESOLUTION_UNIT = 296
SOFTWARE = 305
DATE_TIME = 306
ARTIST = 315
PREDICTOR = 317
COLORMAP = 320
TILEOFFSETS = 324
EXTRASAMPLES = 338
SAMPLEFORMAT = 339
JPEGTABLES = 347
COPYRIGHT = 33432
IPTC_NAA_CHUNK = 33723 # newsphoto properties
PHOTOSHOP_CHUNK = 34377 # photoshop properties
ICCPROFILE = 34675
EXIFIFD = 34665
XMP = 700
# https://github.com/imagej/ImageJA/blob/master/src/main/java/ij/io/TiffDecoder.java
IMAGEJ_META_DATA_BYTE_COUNTS = 50838
IMAGEJ_META_DATA = 50839
COMPRESSION_INFO = {
# Compression => pil compression name
1: "raw",
2: "tiff_ccitt",
3: "group3",
4: "group4",
5: "tiff_lzw",
6: "tiff_jpeg", # obsolete
7: "jpeg",
8: "tiff_adobe_deflate",
32771: "tiff_raw_16", # 16-bit padding
32773: "packbits",
32809: "tiff_thunderscan",
32946: "tiff_deflate",
34676: "tiff_sgilog",
34677: "tiff_sgilog24",
}
COMPRESSION_INFO_REV = dict([(v, k) for (k, v) in COMPRESSION_INFO.items()])
OPEN_INFO = {
# (ByteOrder, PhotoInterpretation, SampleFormat, FillOrder, BitsPerSample,
# ExtraSamples) => mode, rawmode
(II, 0, (1,), 1, (1,), ()): ("1", "1;I"),
(MM, 0, (1,), 1, (1,), ()): ("1", "1;I"),
(II, 0, (1,), 2, (1,), ()): ("1", "1;IR"),
(MM, 0, (1,), 2, (1,), ()): ("1", "1;IR"),
(II, 1, (1,), 1, (1,), ()): ("1", "1"),
(MM, 1, (1,), 1, (1,), ()): ("1", "1"),
(II, 1, (1,), 2, (1,), ()): ("1", "1;R"),
(MM, 1, (1,), 2, (1,), ()): ("1", "1;R"),
(II, 0, (1,), 1, (2,), ()): ("L", "L;2I"),
(MM, 0, (1,), 1, (2,), ()): ("L", "L;2I"),
(II, 0, (1,), 2, (2,), ()): ("L", "L;2IR"),
(MM, 0, (1,), 2, (2,), ()): ("L", "L;2IR"),
(II, 1, (1,), 1, (2,), ()): ("L", "L;2"),
(MM, 1, (1,), 1, (2,), ()): ("L", "L;2"),
(II, 1, (1,), 2, (2,), ()): ("L", "L;2R"),
(MM, 1, (1,), 2, (2,), ()): ("L", "L;2R"),
(II, 0, (1,), 1, (4,), ()): ("L", "L;4I"),
(MM, 0, (1,), 1, (4,), ()): ("L", "L;4I"),
(II, 0, (1,), 2, (4,), ()): ("L", "L;4IR"),
(MM, 0, (1,), 2, (4,), ()): ("L", "L;4IR"),
(II, 1, (1,), 1, (4,), ()): ("L", "L;4"),
(MM, 1, (1,), 1, (4,), ()): ("L", "L;4"),
(II, 1, (1,), 2, (4,), ()): ("L", "L;4R"),
(MM, 1, (1,), 2, (4,), ()): ("L", "L;4R"),
(II, 0, (1,), 1, (8,), ()): ("L", "L;I"),
(MM, 0, (1,), 1, (8,), ()): ("L", "L;I"),
(II, 0, (1,), 2, (8,), ()): ("L", "L;IR"),
(MM, 0, (1,), 2, (8,), ()): ("L", "L;IR"),
(II, 1, (1,), 1, (8,), ()): ("L", "L"),
(MM, 1, (1,), 1, (8,), ()): ("L", "L"),
(II, 1, (1,), 2, (8,), ()): ("L", "L;R"),
(MM, 1, (1,), 2, (8,), ()): ("L", "L;R"),
(II, 1, (1,), 1, (12,), ()): ("I;16", "I;12"),
(II, 1, (1,), 1, (16,), ()): ("I;16", "I;16"),
(MM, 1, (1,), 1, (16,), ()): ("I;16B", "I;16B"),
(II, 1, (2,), 1, (16,), ()): ("I;16S", "I;16S"),
(MM, 1, (2,), 1, (16,), ()): ("I;16BS", "I;16BS"),
(II, 0, (3,), 1, (32,), ()): ("F", "F;32F"),
(MM, 0, (3,), 1, (32,), ()): ("F", "F;32BF"),
(II, 1, (1,), 1, (32,), ()): ("I", "I;32N"),
(II, 1, (2,), 1, (32,), ()): ("I", "I;32S"),
(MM, 1, (2,), 1, (32,), ()): ("I;32BS", "I;32BS"),
(II, 1, (3,), 1, (32,), ()): ("F", "F;32F"),
(MM, 1, (3,), 1, (32,), ()): ("F", "F;32BF"),
(II, 1, (1,), 1, (8, 8), (2,)): ("LA", "LA"),
(MM, 1, (1,), 1, (8, 8), (2,)): ("LA", "LA"),
(II, 2, (1,), 1, (8, 8, 8), ()): ("RGB", "RGB"),
(MM, 2, (1,), 1, (8, 8, 8), ()): ("RGB", "RGB"),
(II, 2, (1,), 2, (8, 8, 8), ()): ("RGB", "RGB;R"),
(MM, 2, (1,), 2, (8, 8, 8), ()): ("RGB", "RGB;R"),
(II, 2, (1,), 1, (8, 8, 8, 8), ()): ("RGBA", "RGBA"), # missing ExtraSamples
(MM, 2, (1,), 1, (8, 8, 8, 8), ()): ("RGBA", "RGBA"), # missing ExtraSamples
(II, 2, (1,), 1, (8, 8, 8, 8), (0,)): ("RGBX", "RGBX"),
(MM, 2, (1,), 1, (8, 8, 8, 8), (0,)): ("RGBX", "RGBX"),
(II, 2, (1,), 1, (8, 8, 8, 8), (1,)): ("RGBA", "RGBa"),
(MM, 2, (1,), 1, (8, 8, 8, 8), (1,)): ("RGBA", "RGBa"),
(II, 2, (1,), 1, (8, 8, 8, 8), (2,)): ("RGBA", "RGBA"),
(MM, 2, (1,), 1, (8, 8, 8, 8), (2,)): ("RGBA", "RGBA"),
(II, 2, (1,), 1, (8, 8, 8, 8), (999,)): ("RGBA", "RGBA"), # Corel Draw 10
(MM, 2, (1,), 1, (8, 8, 8, 8), (999,)): ("RGBA", "RGBA"), # Corel Draw 10
(II, 3, (1,), 1, (1,), ()): ("P", "P;1"),
(MM, 3, (1,), 1, (1,), ()): ("P", "P;1"),
(II, 3, (1,), 2, (1,), ()): ("P", "P;1R"),
(MM, 3, (1,), 2, (1,), ()): ("P", "P;1R"),
(II, 3, (1,), 1, (2,), ()): ("P", "P;2"),
(MM, 3, (1,), 1, (2,), ()): ("P", "P;2"),
(II, 3, (1,), 2, (2,), ()): ("P", "P;2R"),
(MM, 3, (1,), 2, (2,), ()): ("P", "P;2R"),
(II, 3, (1,), 1, (4,), ()): ("P", "P;4"),
(MM, 3, (1,), 1, (4,), ()): ("P", "P;4"),
(II, 3, (1,), 2, (4,), ()): ("P", "P;4R"),
(MM, 3, (1,), 2, (4,), ()): ("P", "P;4R"),
(II, 3, (1,), 1, (8,), ()): ("P", "P"),
(MM, 3, (1,), 1, (8,), ()): ("P", "P"),
(II, 3, (1,), 1, (8, 8), (2,)): ("PA", "PA"),
(MM, 3, (1,), 1, (8, 8), (2,)): ("PA", "PA"),
(II, 3, (1,), 2, (8,), ()): ("P", "P;R"),
(MM, 3, (1,), 2, (8,), ()): ("P", "P;R"),
(II, 5, (1,), 1, (8, 8, 8, 8), ()): ("CMYK", "CMYK"),
(MM, 5, (1,), 1, (8, 8, 8, 8), ()): ("CMYK", "CMYK"),
(II, 6, (1,), 1, (8, 8, 8), ()): ("YCbCr", "YCbCr"),
(MM, 6, (1,), 1, (8, 8, 8), ()): ("YCbCr", "YCbCr"),
(II, 8, (1,), 1, (8, 8, 8), ()): ("LAB", "LAB"),
(MM, 8, (1,), 1, (8, 8, 8), ()): ("LAB", "LAB"),
}
PREFIXES = [b"MM\000\052", b"II\052\000", b"II\xBC\000"]
def _accept(prefix):
return prefix[:4] in PREFIXES
def _limit_rational(val, max_val):
inv = abs(val) > 1
n_d = IFDRational(1 / val if inv else val).limit_rational(max_val)
return n_d[::-1] if inv else n_d
##
# Wrapper for TIFF IFDs.
_load_dispatch = {}
_write_dispatch = {}
class IFDRational(Rational):
""" Implements a rational class where 0/0 is a legal value to match
the in the wild use of exif rationals.
e.g., DigitalZoomRatio - 0.00/0.00 indicates that no digital zoom was used
"""
""" If the denominator is 0, store this as a float('nan'), otherwise store
as a fractions.Fraction(). Delegate as appropriate
"""
__slots__ = ('_numerator', '_denominator', '_val')
def __init__(self, value, denominator=1):
"""
:param value: either an integer numerator, a
float/rational/other number, or an IFDRational
:param denominator: Optional integer denominator
"""
self._denominator = denominator
self._numerator = value
self._val = float(1)
if type(value) == Fraction:
self._numerator = value.numerator
self._denominator = value.denominator
self._val = value
if type(value) == IFDRational:
self._denominator = value.denominator
self._numerator = value.numerator
self._val = value._val
return
if denominator == 0:
self._val = float('nan')
return
elif denominator == 1:
if sys.hexversion < 0x2070000 and type(value) == float:
# python 2.6 is different.
self._val = Fraction.from_float(value)
else:
self._val = Fraction(value)
else:
self._val = Fraction(value, denominator)
@property
def numerator(a):
return a._numerator
@property
def denominator(a):
return a._denominator
def limit_rational(self, max_denominator):
"""
:param max_denominator: Integer, the maximum denominator value
:returns: Tuple of (numerator, denominator)
"""
if self.denominator == 0:
return (self.numerator, self.denominator)
f = self._val.limit_denominator(max_denominator)
return (f.numerator, f.denominator)
def __repr__(self):
return str(float(self._val))
def __hash__(self):
return self._val.__hash__()
def __eq__(self, other):
return self._val == other
def _delegate(op):
def delegate(self, *args):
return getattr(self._val, op)(*args)
return delegate
""" a = ['add','radd', 'sub', 'rsub','div', 'rdiv', 'mul', 'rmul',
'truediv', 'rtruediv', 'floordiv',
'rfloordiv','mod','rmod', 'pow','rpow', 'pos', 'neg',
'abs', 'trunc', 'lt', 'gt', 'le', 'ge', 'nonzero',
'ceil', 'floor', 'round']
print "\n".join("__%s__ = _delegate('__%s__')" % (s,s) for s in a)
"""
__add__ = _delegate('__add__')
__radd__ = _delegate('__radd__')
__sub__ = _delegate('__sub__')
__rsub__ = _delegate('__rsub__')
__div__ = _delegate('__div__')
__rdiv__ = _delegate('__rdiv__')
__mul__ = _delegate('__mul__')
__rmul__ = _delegate('__rmul__')
__truediv__ = _delegate('__truediv__')
__rtruediv__ = _delegate('__rtruediv__')
__floordiv__ = _delegate('__floordiv__')
__rfloordiv__ = _delegate('__rfloordiv__')
__mod__ = _delegate('__mod__')
__rmod__ = _delegate('__rmod__')
__pow__ = _delegate('__pow__')
__rpow__ = _delegate('__rpow__')
__pos__ = _delegate('__pos__')
__neg__ = _delegate('__neg__')
__abs__ = _delegate('__abs__')
__trunc__ = _delegate('__trunc__')
__lt__ = _delegate('__lt__')
__gt__ = _delegate('__gt__')
__le__ = _delegate('__le__')
__ge__ = _delegate('__ge__')
__nonzero__ = _delegate('__nonzero__')
__ceil__ = _delegate('__ceil__')
__floor__ = _delegate('__floor__')
__round__ = _delegate('__round__')
class ImageFileDirectory_v2(collections.MutableMapping):
"""This class represents a TIFF tag directory. To speed things up, we
don't decode tags unless they're asked for.
Exposes a dictionary interface of the tags in the directory::
ifd = ImageFileDirectory_v2()
ifd[key] = 'Some Data'
ifd.tagtype[key] = 2
print(ifd[key])
'Some Data'
Individual values are returned as the strings or numbers, sequences are
returned as tuples of the values.
The tiff metadata type of each item is stored in a dictionary of
tag types in
`~PIL.TiffImagePlugin.ImageFileDirectory_v2.tagtype`. The types
are read from a tiff file, guessed from the type added, or added
manually.
Data Structures:
* self.tagtype = {}
* Key: numerical tiff tag number
* Value: integer corresponding to the data type from `~PIL.TiffTags.TYPES`
.. versionadded:: 3.0.0
"""
"""
Documentation:
'internal' data structures:
* self._tags_v2 = {} Key: numerical tiff tag number
Value: decoded data, as tuple for multiple values
* self._tagdata = {} Key: numerical tiff tag number
Value: undecoded byte string from file
* self._tags_v1 = {} Key: numerical tiff tag number
Value: decoded data in the v1 format
Tags will be found in the private attributes self._tagdata, and in
self._tags_v2 once decoded.
Self.legacy_api is a value for internal use, and shouldn't be
changed from outside code. In cooperation with the
ImageFileDirectory_v1 class, if legacy_api is true, then decoded
tags will be populated into both _tags_v1 and _tags_v2. _Tags_v2
will be used if this IFD is used in the TIFF save routine. Tags
should be read from tags_v1 if legacy_api == true.
"""
def __init__(self, ifh=b"II\052\0\0\0\0\0", prefix=None):
"""Initialize an ImageFileDirectory.
To construct an ImageFileDirectory from a real file, pass the 8-byte
magic header to the constructor. To only set the endianness, pass it
as the 'prefix' keyword argument.
:param ifh: One of the accepted magic headers (cf. PREFIXES); also sets
endianness.
:param prefix: Override the endianness of the file.
"""
if ifh[:4] not in PREFIXES:
raise SyntaxError("not a TIFF file (header %r not valid)" % ifh)
self._prefix = prefix if prefix is not None else ifh[:2]
if self._prefix == MM:
self._endian = ">"
elif self._prefix == II:
self._endian = "<"
else:
raise SyntaxError("not a TIFF IFD")
self.reset()
self.next, = self._unpack("L", ifh[4:])
self._legacy_api = False
prefix = property(lambda self: self._prefix)
offset = property(lambda self: self._offset)
legacy_api = property(lambda self: self._legacy_api)
@legacy_api.setter
def legacy_api(self, value):
raise Exception("Not allowing setting of legacy api")
def reset(self):
self._tags_v1 = {} # will remain empty if legacy_api is false
self._tags_v2 = {} # main tag storage
self._tagdata = {}
self.tagtype = {} # added 2008-06-05 by Florian Hoech
self._next = None
self._offset = None
def __str__(self):
return str(dict(self))
def as_dict(self):
"""Return a dictionary of the image's tags.
.. deprecated:: 3.0.0
"""
warnings.warn("as_dict() is deprecated. " +
"Please use dict(ifd) instead.", DeprecationWarning)
return dict(self)
def named(self):
"""
:returns: dict of name|key: value
Returns the complete tag dictionary, with named tags where possible.
"""
return dict((TiffTags.lookup(code).name, value)
for code, value in self.items())
def __len__(self):
return len(set(self._tagdata) | set(self._tags_v2))
def __getitem__(self, tag):
if tag not in self._tags_v2: # unpack on the fly
data = self._tagdata[tag]
typ = self.tagtype[tag]
size, handler = self._load_dispatch[typ]
self[tag] = handler(self, data, self.legacy_api) # check type
val = self._tags_v2[tag]
if self.legacy_api and not isinstance(val, (tuple, bytes)):
val = val,
return val
def __contains__(self, tag):
return tag in self._tags_v2 or tag in self._tagdata
if bytes is str:
def has_key(self, tag):
return tag in self
def __setitem__(self, tag, value):
self._setitem(tag, value, self.legacy_api)
def _setitem(self, tag, value, legacy_api):
basetypes = (Number, bytes, str)
if bytes is str:
basetypes += unicode,
info = TiffTags.lookup(tag)
values = [value] if isinstance(value, basetypes) else value
if tag not in self.tagtype:
if info.type:
self.tagtype[tag] = info.type
else:
self.tagtype[tag] = 7
if all(isinstance(v, IFDRational) for v in values):
self.tagtype[tag] = 5
elif all(isinstance(v, int) for v in values):
if all(v < 2 ** 16 for v in values):
self.tagtype[tag] = 3
else:
self.tagtype[tag] = 4
elif all(isinstance(v, float) for v in values):
self.tagtype[tag] = 12
else:
if bytes is str:
# Never treat data as binary by default on Python 2.
self.tagtype[tag] = 2
else:
if all(isinstance(v, str) for v in values):
self.tagtype[tag] = 2
if self.tagtype[tag] == 7 and bytes is not str:
values = [value.encode("ascii", 'replace') if isinstance(value, str) else value]
values = tuple(info.cvt_enum(value) for value in values)
dest = self._tags_v1 if legacy_api else self._tags_v2
if info.length == 1:
if legacy_api and self.tagtype[tag] in [5, 10]:
values = values,
dest[tag], = values
else:
dest[tag] = values
def __delitem__(self, tag):
self._tags_v2.pop(tag, None)
self._tags_v1.pop(tag, None)
self._tagdata.pop(tag, None)
def __iter__(self):
return iter(set(self._tagdata) | set(self._tags_v2))
def _unpack(self, fmt, data):
return struct.unpack(self._endian + fmt, data)
def _pack(self, fmt, *values):
return struct.pack(self._endian + fmt, *values)
def _register_loader(idx, size):
def decorator(func):
from PIL.TiffTags import TYPES
if func.__name__.startswith("load_"):
TYPES[idx] = func.__name__[5:].replace("_", " ")
_load_dispatch[idx] = size, func
return func
return decorator
def _register_writer(idx):
def decorator(func):
_write_dispatch[idx] = func
return func
return decorator
def _register_basic(idx_fmt_name):
from PIL.TiffTags import TYPES
idx, fmt, name = idx_fmt_name
TYPES[idx] = name
size = struct.calcsize("=" + fmt)
_load_dispatch[idx] = size, lambda self, data, legacy_api=True: (
self._unpack("{0}{1}".format(len(data) // size, fmt), data))
_write_dispatch[idx] = lambda self, *values: (
b"".join(self._pack(fmt, value) for value in values))
list(map(_register_basic,
[(3, "H", "short"), (4, "L", "long"),
(6, "b", "signed byte"), (8, "h", "signed short"),
(9, "l", "signed long"), (11, "f", "float"), (12, "d", "double")]))
@_register_loader(1, 1) # Basic type, except for the legacy API.
def load_byte(self, data, legacy_api=True):
return data
@_register_writer(1) # Basic type, except for the legacy API.
def write_byte(self, data):
return data
@_register_loader(2, 1)
def load_string(self, data, legacy_api=True):
if data.endswith(b"\0"):
data = data[:-1]
return data.decode("latin-1", "replace")
@_register_writer(2)
def write_string(self, value):
# remerge of https://github.com/python-pillow/Pillow/pull/1416
if sys.version_info[0] == 2:
value = value.decode('ascii', 'replace')
return b"" + value.encode('ascii', 'replace') + b"\0"
@_register_loader(5, 8)
def load_rational(self, data, legacy_api=True):
vals = self._unpack("{0}L".format(len(data) // 4), data)
combine = lambda a, b: (a, b) if legacy_api else IFDRational(a, b)
return tuple(combine(num, denom)
for num, denom in zip(vals[::2], vals[1::2]))
@_register_writer(5)
def write_rational(self, *values):
return b"".join(self._pack("2L", *_limit_rational(frac, 2 ** 31))
for frac in values)
@_register_loader(7, 1)
def load_undefined(self, data, legacy_api=True):
return data
@_register_writer(7)
def write_undefined(self, value):
return value
@_register_loader(10, 8)
def load_signed_rational(self, data, legacy_api=True):
vals = self._unpack("{0}l".format(len(data) // 4), data)
combine = lambda a, b: (a, b) if legacy_api else IFDRational(a, b)
return tuple(combine(num, denom)
for num, denom in zip(vals[::2], vals[1::2]))
@_register_writer(10)
def write_signed_rational(self, *values):
return b"".join(self._pack("2L", *_limit_rational(frac, 2 ** 30))
for frac in values)
def _ensure_read(self, fp, size):
ret = fp.read(size)
if len(ret) != size:
raise IOError("Corrupt EXIF data. " +
"Expecting to read %d bytes but only got %d. " %
(size, len(ret)))
return ret
def load(self, fp):
self.reset()
self._offset = fp.tell()
try:
for i in range(self._unpack("H", self._ensure_read(fp, 2))[0]):
tag, typ, count, data = self._unpack("HHL4s", self._ensure_read(fp, 12))
if DEBUG:
tagname = TiffTags.lookup(tag).name
typname = TYPES.get(typ, "unknown")
print("tag: %s (%d) - type: %s (%d)" %
(tagname, tag, typname, typ), end=" ")
try:
unit_size, handler = self._load_dispatch[typ]
except KeyError:
if DEBUG:
print("- unsupported type", typ)
continue # ignore unsupported type
size = count * unit_size
if size > 4:
here = fp.tell()
offset, = self._unpack("L", data)
if DEBUG:
print("Tag Location: %s - Data Location: %s" %
(here, offset), end=" ")
fp.seek(offset)
data = ImageFile._safe_read(fp, size)
fp.seek(here)
else:
data = data[:size]
if len(data) != size:
warnings.warn("Possibly corrupt EXIF data. "
"Expecting to read %d bytes but only got %d. "
"Skipping tag %s" % (size, len(data), tag))
continue
self._tagdata[tag] = data
self.tagtype[tag] = typ
if DEBUG:
if size > 32:
print("- value: <table: %d bytes>" % size)
else:
print("- value:", self[tag])
self.next, = self._unpack("L", self._ensure_read(fp, 4))
except IOError as msg:
warnings.warn(str(msg))
return
def save(self, fp):
if fp.tell() == 0: # skip TIFF header on subsequent pages
# tiff header -- PIL always starts the first IFD at offset 8
fp.write(self._prefix + self._pack("HL", 42, 8))
# FIXME What about tagdata?
fp.write(self._pack("H", len(self._tags_v2)))
entries = []
offset = fp.tell() + len(self._tags_v2) * 12 + 4
stripoffsets = None
# pass 1: convert tags to binary format
# always write tags in ascending order
for tag, value in sorted(self._tags_v2.items()):
if tag == STRIPOFFSETS:
stripoffsets = len(entries)
typ = self.tagtype.get(tag)
if DEBUG:
print("Tag %s, Type: %s, Value: %s" % (tag, typ, value))
values = value if isinstance(value, tuple) else (value,)
data = self._write_dispatch[typ](self, *values)
if DEBUG:
tagname = TiffTags.lookup(tag).name
typname = TYPES.get(typ, "unknown")
print("save: %s (%d) - type: %s (%d)" %
(tagname, tag, typname, typ), end=" ")
if len(data) >= 16:
print("- value: <table: %d bytes>" % len(data))
else:
print("- value:", values)
# count is sum of lengths for string and arbitrary data
count = len(data) if typ in [2, 7] else len(values)
# figure out if data fits into the entry
if len(data) <= 4:
entries.append((tag, typ, count, data.ljust(4, b"\0"), b""))
else:
entries.append((tag, typ, count, self._pack("L", offset), data))
offset += (len(data) + 1) // 2 * 2 # pad to word
# update strip offset data to point beyond auxiliary data
if stripoffsets is not None:
tag, typ, count, value, data = entries[stripoffsets]
if data:
raise NotImplementedError(
"multistrip support not yet implemented")
value = self._pack("L", self._unpack("L", value)[0] + offset)
entries[stripoffsets] = tag, typ, count, value, data
# pass 2: write entries to file
for tag, typ, count, value, data in entries:
if DEBUG > 1:
print(tag, typ, count, repr(value), repr(data))
fp.write(self._pack("HHL4s", tag, typ, count, value))
# -- overwrite here for multi-page --
fp.write(b"\0\0\0\0") # end of entries
# pass 3: write auxiliary data to file
for tag, typ, count, value, data in entries:
fp.write(data)
if len(data) & 1:
fp.write(b"\0")
return offset
ImageFileDirectory_v2._load_dispatch = _load_dispatch
ImageFileDirectory_v2._write_dispatch = _write_dispatch
for idx, name in TYPES.items():
name = name.replace(" ", "_")
setattr(ImageFileDirectory_v2, "load_" + name, _load_dispatch[idx][1])
setattr(ImageFileDirectory_v2, "write_" + name, _write_dispatch[idx])
del _load_dispatch, _write_dispatch, idx, name
# Legacy ImageFileDirectory support.
class ImageFileDirectory_v1(ImageFileDirectory_v2):
"""This class represents the **legacy** interface to a TIFF tag directory.
Exposes a dictionary interface of the tags in the directory::
ifd = ImageFileDirectory_v1()
ifd[key] = 'Some Data'
ifd.tagtype[key] = 2
print ifd[key]
('Some Data',)
Also contains a dictionary of tag types as read from the tiff image file,
`~PIL.TiffImagePlugin.ImageFileDirectory_v1.tagtype`.
Values are returned as a tuple.
.. deprecated:: 3.0.0
"""
def __init__(self, *args, **kwargs):
ImageFileDirectory_v2.__init__(self, *args, **kwargs)
self._legacy_api = True
tags = property(lambda self: self._tags_v1)
tagdata = property(lambda self: self._tagdata)
@classmethod
def from_v2(cls, original):
""" Returns an
:py:class:`~PIL.TiffImagePlugin.ImageFileDirectory_v1`
instance with the same data as is contained in the original
:py:class:`~PIL.TiffImagePlugin.ImageFileDirectory_v2`
instance.
:returns: :py:class:`~PIL.TiffImagePlugin.ImageFileDirectory_v1`
"""
ifd = cls(prefix=original.prefix)
ifd._tagdata = original._tagdata
ifd.tagtype = original.tagtype
ifd.next = original.next # an indicator for multipage tiffs
return ifd
def to_v2(self):
""" Returns an
:py:class:`~PIL.TiffImagePlugin.ImageFileDirectory_v2`
instance with the same data as is contained in the original
:py:class:`~PIL.TiffImagePlugin.ImageFileDirectory_v1`
instance.
:returns: :py:class:`~PIL.TiffImagePlugin.ImageFileDirectory_v2`
"""
ifd = ImageFileDirectory_v2(prefix=self.prefix)
ifd._tagdata = dict(self._tagdata)
ifd.tagtype = dict(self.tagtype)
ifd._tags_v2 = dict(self._tags_v2)
return ifd
def __contains__(self, tag):
return tag in self._tags_v1 or tag in self._tagdata
def __len__(self):
return len(set(self._tagdata) | set(self._tags_v1))
def __iter__(self):
return iter(set(self._tagdata) | set(self._tags_v1))
def __setitem__(self, tag, value):
for legacy_api in (False, True):
self._setitem(tag, value, legacy_api)
def __getitem__(self, tag):
if tag not in self._tags_v1: # unpack on the fly
data = self._tagdata[tag]
typ = self.tagtype[tag]
size, handler = self._load_dispatch[typ]
for legacy in (False, True):
self._setitem(tag, handler(self, data, legacy), legacy)
val = self._tags_v1[tag]
if not isinstance(val, (tuple, bytes)):
val = val,
return val
# undone -- switch this pointer when IFD_LEGACY_API == False
ImageFileDirectory = ImageFileDirectory_v1
##
# Image plugin for TIFF files.
class TiffImageFile(ImageFile.ImageFile):
format = "TIFF"
format_description = "Adobe TIFF"
def _open(self):
"Open the first image in a TIFF file"
# Header
ifh = self.fp.read(8)
# image file directory (tag dictionary)
self.tag_v2 = ImageFileDirectory_v2(ifh)
# legacy tag/ifd entries will be filled in later
self.tag = self.ifd = None
# setup frame pointers
self.__first = self.__next = self.tag_v2.next
self.__frame = -1
self.__fp = self.fp
self._frame_pos = []
self._n_frames = None
self._is_animated = None
if DEBUG:
print("*** TiffImageFile._open ***")
print("- __first:", self.__first)
print("- ifh: ", ifh)
# and load the first frame
self._seek(0)
@property
def n_frames(self):
if self._n_frames is None:
current = self.tell()
try:
while True:
self._seek(self.tell() + 1)
except EOFError:
self._n_frames = self.tell() + 1
self.seek(current)
return self._n_frames
@property
def is_animated(self):
if self._is_animated is None:
current = self.tell()
try:
self.seek(1)
self._is_animated = True
except EOFError:
self._is_animated = False
self.seek(current)
return self._is_animated
def seek(self, frame):
"Select a given frame as current image"
self._seek(max(frame, 0)) # Questionable backwards compatibility.
# Create a new core image object on second and
# subsequent frames in the image. Image may be
# different size/mode.
Image._decompression_bomb_check(self.size)
self.im = Image.core.new(self.mode, self.size)
def _seek(self, frame):
self.fp = self.__fp
while len(self._frame_pos) <= frame:
if not self.__next:
raise EOFError("no more images in TIFF file")
if DEBUG:
print("Seeking to frame %s, on frame %s, "
"__next %s, location: %s" %
(frame, self.__frame, self.__next, self.fp.tell()))
# reset python3 buffered io handle in case fp
# was passed to libtiff, invalidating the buffer
self.fp.tell()
self.fp.seek(self.__next)
self._frame_pos.append(self.__next)
if DEBUG:
print("Loading tags, location: %s" % self.fp.tell())
self.tag_v2.load(self.fp)
self.__next = self.tag_v2.next
self.__frame += 1
self.fp.seek(self._frame_pos[frame])
self.tag_v2.load(self.fp)
# fill the legacy tag/ifd entries
self.tag = self.ifd = ImageFileDirectory_v1.from_v2(self.tag_v2)
self.__frame = frame
self._setup()
def tell(self):
"Return the current frame number"
return self.__frame
def _decoder(self, rawmode, layer, tile=None):
"Setup decoder contexts"
args = None
if rawmode == "RGB" and self._planar_configuration == 2:
rawmode = rawmode[layer]
compression = self._compression
if compression == "raw":
args = (rawmode, 0, 1)
elif compression == "jpeg":
args = rawmode, ""
if JPEGTABLES in self.tag_v2:
# Hack to handle abbreviated JPEG headers
# FIXME This will fail with more than one value