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Flake8 fixes
This commit is contained in:
parent
1208fe89cd
commit
1b98b76bcf
288
PIL/OleFileIO.py
288
PIL/OleFileIO.py
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@ -256,11 +256,14 @@ __version__ = '0.42b'
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import io
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import sys
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import struct, array, os.path, datetime
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import struct
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import array
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import os.path
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import datetime
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#=== COMPATIBILITY WORKAROUNDS ================================================
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#[PL] Define explicitly the public API to avoid private objects in pydoc:
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# [PL] Define explicitly the public API to avoid private objects in pydoc:
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#TODO: add more
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# __all__ = ['OleFileIO', 'isOleFile', 'MAGIC']
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@ -276,7 +279,7 @@ except:
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# no xrange, for Python 3 it was renamed as range:
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iterrange = range
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#[PL] workaround to fix an issue with array item size on 64 bits systems:
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# [PL] workaround to fix an issue with array item size on 64 bits systems:
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if array.array('L').itemsize == 4:
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# on 32 bits platforms, long integers in an array are 32 bits:
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UINT32 = 'L'
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@ -300,14 +303,14 @@ else:
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raise ValueError('Need to fix a bug with 32 bit arrays, please contact author...')
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#[PL] These workarounds were inspired from the Path module
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# [PL] These workarounds were inspired from the Path module
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# (see http://www.jorendorff.com/articles/python/path/)
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try:
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basestring
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except NameError:
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basestring = str
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#[PL] Experimental setting: if True, OLE filenames will be kept in Unicode
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# [PL] Experimental setting: if True, OLE filenames will be kept in Unicode
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# if False (default PIL behaviour), all filenames are converted to Latin-1.
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KEEP_UNICODE_NAMES = True
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@ -323,15 +326,22 @@ else:
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#TODO: replace this by proper logging
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#[PL] DEBUG display mode: False by default, use set_debug_mode() or "-d" on
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# [PL] DEBUG display mode: False by default, use set_debug_mode() or "-d" on
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# command line to change it.
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DEBUG_MODE = False
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def debug_print(msg):
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print(msg)
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def debug_pass(msg):
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pass
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debug = debug_pass
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def set_debug_mode(debug_mode):
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"""
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Set debug mode on or off, to control display of debugging messages.
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@ -350,39 +360,39 @@ def set_debug_mode(debug_mode):
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# magic bytes that should be at the beginning of every OLE file:
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MAGIC = b'\xD0\xCF\x11\xE0\xA1\xB1\x1A\xE1'
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#[PL]: added constants for Sector IDs (from AAF specifications)
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MAXREGSECT = 0xFFFFFFFA # (-6) maximum SECT
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DIFSECT = 0xFFFFFFFC # (-4) denotes a DIFAT sector in a FAT
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FATSECT = 0xFFFFFFFD # (-3) denotes a FAT sector in a FAT
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ENDOFCHAIN = 0xFFFFFFFE # (-2) end of a virtual stream chain
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FREESECT = 0xFFFFFFFF # (-1) unallocated sector
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# [PL]: added constants for Sector IDs (from AAF specifications)
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MAXREGSECT = 0xFFFFFFFA # (-6) maximum SECT
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DIFSECT = 0xFFFFFFFC # (-4) denotes a DIFAT sector in a FAT
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FATSECT = 0xFFFFFFFD # (-3) denotes a FAT sector in a FAT
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ENDOFCHAIN = 0xFFFFFFFE # (-2) end of a virtual stream chain
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FREESECT = 0xFFFFFFFF # (-1) unallocated sector
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#[PL]: added constants for Directory Entry IDs (from AAF specifications)
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MAXREGSID = 0xFFFFFFFA # (-6) maximum directory entry ID
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NOSTREAM = 0xFFFFFFFF # (-1) unallocated directory entry
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# [PL]: added constants for Directory Entry IDs (from AAF specifications)
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MAXREGSID = 0xFFFFFFFA # (-6) maximum directory entry ID
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NOSTREAM = 0xFFFFFFFF # (-1) unallocated directory entry
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#[PL] object types in storage (from AAF specifications)
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STGTY_EMPTY = 0 # empty directory entry (according to OpenOffice.org doc)
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STGTY_STORAGE = 1 # element is a storage object
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STGTY_STREAM = 2 # element is a stream object
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STGTY_LOCKBYTES = 3 # element is an ILockBytes object
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STGTY_PROPERTY = 4 # element is an IPropertyStorage object
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STGTY_ROOT = 5 # element is a root storage
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# [PL] object types in storage (from AAF specifications)
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STGTY_EMPTY = 0 # empty directory entry (according to OpenOffice.org doc)
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STGTY_STORAGE = 1 # element is a storage object
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STGTY_STREAM = 2 # element is a stream object
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STGTY_LOCKBYTES = 3 # element is an ILockBytes object
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STGTY_PROPERTY = 4 # element is an IPropertyStorage object
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STGTY_ROOT = 5 # element is a root storage
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#
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# --------------------------------------------------------------------
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# property types
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VT_EMPTY=0; VT_NULL=1; VT_I2=2; VT_I4=3; VT_R4=4; VT_R8=5; VT_CY=6;
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VT_DATE=7; VT_BSTR=8; VT_DISPATCH=9; VT_ERROR=10; VT_BOOL=11;
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VT_VARIANT=12; VT_UNKNOWN=13; VT_DECIMAL=14; VT_I1=16; VT_UI1=17;
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VT_UI2=18; VT_UI4=19; VT_I8=20; VT_UI8=21; VT_INT=22; VT_UINT=23;
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VT_VOID=24; VT_HRESULT=25; VT_PTR=26; VT_SAFEARRAY=27; VT_CARRAY=28;
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VT_USERDEFINED=29; VT_LPSTR=30; VT_LPWSTR=31; VT_FILETIME=64;
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VT_BLOB=65; VT_STREAM=66; VT_STORAGE=67; VT_STREAMED_OBJECT=68;
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VT_STORED_OBJECT=69; VT_BLOB_OBJECT=70; VT_CF=71; VT_CLSID=72;
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VT_VECTOR=0x1000;
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VT_EMPTY = 0; VT_NULL = 1; VT_I2 = 2; VT_I4 = 3; VT_R4 = 4; VT_R8 = 5; VT_CY = 6;
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VT_DATE = 7; VT_BSTR = 8; VT_DISPATCH = 9; VT_ERROR = 10; VT_BOOL = 11;
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VT_VARIANT = 12; VT_UNKNOWN = 13; VT_DECIMAL = 14; VT_I1 = 16; VT_UI1 = 17;
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VT_UI2 = 18; VT_UI4 = 19; VT_I8 = 20; VT_UI8 = 21; VT_INT = 22; VT_UINT = 23;
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VT_VOID = 24; VT_HRESULT = 25; VT_PTR = 26; VT_SAFEARRAY = 27; VT_CARRAY = 28;
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VT_USERDEFINED = 29; VT_LPSTR = 30; VT_LPWSTR = 31; VT_FILETIME = 64;
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VT_BLOB = 65; VT_STREAM = 66; VT_STORAGE = 67; VT_STREAMED_OBJECT = 68;
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VT_STORED_OBJECT = 69; VT_BLOB_OBJECT = 70; VT_CF = 71; VT_CLSID = 72;
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VT_VECTOR = 0x1000;
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# map property id to name (for debugging purposes)
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@ -398,7 +408,7 @@ for keyword, var in list(vars().items()):
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WORD_CLSID = "00020900-0000-0000-C000-000000000046"
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#TODO: check Excel, PPT, ...
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#[PL]: Defect levels to classify parsing errors - see OleFileIO._raise_defect()
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# [PL]: Defect levels to classify parsing errors - see OleFileIO._raise_defect()
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DEFECT_UNSURE = 10 # a case which looks weird, but not sure it's a defect
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DEFECT_POTENTIAL = 20 # a potential defect
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DEFECT_INCORRECT = 30 # an error according to specifications, but parsing
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@ -410,7 +420,7 @@ DEFECT_FATAL = 40 # an error which cannot be ignored, parsing is
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# (this is used in isOleFile and OleFile.open)
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MINIMAL_OLEFILE_SIZE = 1536
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#[PL] add useful constants to __all__:
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# [PL] add useful constants to __all__:
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# for key in list(vars().keys()):
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# if key.startswith('STGTY_') or key.startswith('DEFECT_'):
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# __all__.append(key)
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@ -418,7 +428,7 @@ MINIMAL_OLEFILE_SIZE = 1536
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#=== FUNCTIONS ===============================================================
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def isOleFile (filename):
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def isOleFile(filename):
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"""
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Test if a file is an OLE container (according to the magic bytes in its header).
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@ -502,7 +512,6 @@ def _clsid(clsid):
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tuple(map(i8, clsid[8:16]))))
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def filetime2datetime(filetime):
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"""
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convert FILETIME (64 bits int) to Python datetime.datetime
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@ -514,7 +523,6 @@ def filetime2datetime(filetime):
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return _FILETIME_null_date + datetime.timedelta(microseconds=filetime//10)
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#=== CLASSES ==================================================================
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class OleMetadata(object):
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@ -622,7 +630,6 @@ class OleMetadata(object):
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self.language = None
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self.doc_version = None
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def parse_properties(self, olefile):
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"""
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Parse standard properties of an OLE file, from the streams
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@ -707,11 +714,11 @@ class _OleStream(io.BytesIO):
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"""
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debug('_OleStream.__init__:')
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debug(' sect=%d (%X), size=%d, offset=%d, sectorsize=%d, len(fat)=%d, fp=%s'
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%(sect,sect,size,offset,sectorsize,len(fat), repr(fp)))
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#[PL] To detect malformed documents with FAT loops, we compute the
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% (sect, sect, size, offset, sectorsize, len(fat), repr(fp)))
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# [PL] To detect malformed documents with FAT loops, we compute the
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# expected number of sectors in the stream:
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unknown_size = False
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if size==0x7FFFFFFF:
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if size == 0x7FFFFFFF:
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# this is the case when called from OleFileIO._open(), and stream
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# size is not known in advance (for example when reading the
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# Directory stream). Then we can only guess maximum size:
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if size == 0 and sect != ENDOFCHAIN:
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debug('size == 0 and sect != ENDOFCHAIN:')
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raise IOError('incorrect OLE sector index for empty stream')
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#[PL] A fixed-length for loop is used instead of an undefined while
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# [PL] A fixed-length for loop is used instead of an undefined while
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# loop to avoid DoS attacks:
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for i in range(nb_sectors):
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# Sector index may be ENDOFCHAIN, but only if size was unknown
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debug('sect=ENDOFCHAIN before expected size')
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raise IOError('incomplete OLE stream')
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# sector index should be within FAT:
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if sect<0 or sect>=len(fat):
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if sect < 0 or sect >= len(fat):
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debug('sect=%d (%X) / len(fat)=%d' % (sect, sect, len(fat)))
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debug('i=%d / nb_sectors=%d' %(i, nb_sectors))
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debug('i=%d / nb_sectors=%d' % (i, nb_sectors))
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## tmp_data = b"".join(data)
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## f = open('test_debug.bin', 'wb')
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## f.write(tmp_data)
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# Note: if sector is the last of the file, sometimes it is not a
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# complete sector (of 512 or 4K), so we may read less than
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# sectorsize.
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if len(sector_data)!=sectorsize and sect!=(len(fat)-1):
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if len(sector_data) != sectorsize and sect != (len(fat)-1):
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debug('sect=%d / len(fat)=%d, seek=%d / filesize=%d, len read=%d' %
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(sect, len(fat), offset+sectorsize*sect, filesize, len(sector_data)))
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debug('seek+len(read)=%d' % (offset+sectorsize*sect+len(sector_data)))
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except IndexError:
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# [PL] if pointer is out of the FAT an exception is raised
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raise IOError('incorrect OLE FAT, sector index out of range')
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#[PL] Last sector should be a "end of chain" marker:
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# [PL] Last sector should be a "end of chain" marker:
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if sect != ENDOFCHAIN:
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raise IOError('incorrect last sector index in OLE stream')
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data = b"".join(data)
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"""
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OLE2 Directory Entry
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"""
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#[PL] parsing code moved from OleFileIO.loaddirectory
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# [PL] parsing code moved from OleFileIO.loaddirectory
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# struct to parse directory entries:
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# <: little-endian byte order, standard sizes
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DIRENTRY_SIZE = 128
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assert struct.calcsize(STRUCT_DIRENTRY) == DIRENTRY_SIZE
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def __init__(self, entry, sid, olefile):
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"""
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Constructor for an _OleDirectoryEntry object.
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#debug (struct.unpack(fmt_entry, entry[:len_entry]))
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# name should be at most 31 unicode characters + null character,
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# so 64 bytes in total (31*2 + 2):
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if namelength>64:
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if namelength > 64:
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olefile.raise_defect(DEFECT_INCORRECT, 'incorrect DirEntry name length')
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# if exception not raised, namelength is set to the maximum value:
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namelength = 64
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olefile.raise_defect(DEFECT_UNSURE, 'incorrect OLE stream size')
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self.size = sizeLow
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else:
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self.size = sizeLow + (long(sizeHigh)<<32)
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self.size = sizeLow + (long(sizeHigh) << 32)
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debug(' - size: %d (sizeLow=%d, sizeHigh=%d)' % (self.size, sizeLow, sizeHigh))
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self.clsid = _clsid(clsid)
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if self.entry_type == STGTY_STORAGE and self.size != 0:
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olefile.raise_defect(DEFECT_POTENTIAL, 'OLE storage with size>0')
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# check if stream is not already referenced elsewhere:
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if self.entry_type in (STGTY_ROOT, STGTY_STREAM) and self.size>0:
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if self.entry_type in (STGTY_ROOT, STGTY_STREAM) and self.size > 0:
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if self.size < olefile.minisectorcutoff \
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and self.entry_type==STGTY_STREAM: # only streams can be in MiniFAT
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and self.entry_type == STGTY_STREAM: # only streams can be in MiniFAT
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# ministream object
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minifat = True
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else:
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minifat = False
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olefile._check_duplicate_stream(self.isectStart, minifat)
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def build_storage_tree(self):
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"""
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Read and build the red-black tree attached to this _OleDirectoryEntry
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# (see rich comparison methods in this class)
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self.kids.sort()
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def append_kids(self, child_sid):
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"""
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Walk through red-black tree of children of this directory entry to add
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:param child_sid : index of child directory entry to use, or None when called
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first time for the root. (only used during recursion)
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"""
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#[PL] this method was added to use simple recursion instead of a complex
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# [PL] this method was added to use simple recursion instead of a complex
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# algorithm.
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# if this is not a storage or a leaf of the tree, nothing to do:
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if child_sid == NOSTREAM:
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return
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# check if child SID is in the proper range:
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if child_sid<0 or child_sid>=len(self.olefile.direntries):
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if child_sid < 0 or child_sid >= len(self.olefile.direntries):
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self.olefile.raise_defect(DEFECT_FATAL, 'OLE DirEntry index out of range')
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# get child direntry:
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child = self.olefile._load_direntry(child_sid) #direntries[child_sid]
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# Afterwards build kid's own tree if it's also a storage:
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child.build_storage_tree()
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def __eq__(self, other):
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"Compare entries by name"
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return self.name == other.name
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#TODO: replace by the same function as MS implementation ?
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# (order by name length first, then case-insensitive order)
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def dump(self, tab = 0):
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"Dump this entry, and all its subentries (for debug purposes only)"
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TYPES = ["(invalid)", "(storage)", "(stream)", "(lockbytes)",
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for kid in self.kids:
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kid.dump(tab + 2)
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def getmtime(self):
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"""
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Return modification time of a directory entry.
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return None
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return filetime2datetime(self.modifyTime)
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def getctime(self):
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"""
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Return creation time of a directory entry.
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@ -1134,7 +1133,6 @@ class OleFileIO(object):
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if filename:
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self.open(filename, write_mode=write_mode)
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def raise_defect(self, defect_level, message, exception_type=IOError):
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"""
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This method should be called for any defect found during file parsing.
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# just record the issue, no exception raised:
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self.parsing_issues.append((exception_type, message))
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def _decode_utf16_str(self, utf16_str, errors='replace'):
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"""
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Decode a string encoded in UTF-16 LE format, as found in the OLE
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@ -1177,7 +1174,6 @@ class OleFileIO(object):
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# path_encoding=None, return the Unicode string as-is:
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return unicode_str
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def open(self, filename, write_mode=False):
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"""
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Open an OLE2 file in read-only or read/write mode.
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@ -1196,7 +1192,7 @@ class OleFileIO(object):
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of read-only by default. (ignored if filename is not a path)
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"""
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self.write_mode = write_mode
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#[PL] check if filename is a string-like or file-like object:
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# [PL] check if filename is a string-like or file-like object:
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# (it is better to check for a read() method)
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if hasattr(filename, 'read'):
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#TODO: also check seek and tell methods?
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@ -1221,7 +1217,7 @@ class OleFileIO(object):
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# file-like objects:
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#TODO: do it above, using getsize with filename when possible?
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#TODO: fix code to fail with clear exception when filesize cannot be obtained
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filesize=0
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filesize = 0
|
||||
self.fp.seek(0, os.SEEK_END)
|
||||
try:
|
||||
filesize = self.fp.tell()
|
||||
|
@ -1278,7 +1274,7 @@ class OleFileIO(object):
|
|||
# '<' indicates little-endian byte ordering for Intel (cf. struct module help)
|
||||
fmt_header = '<8s16sHHHHHHLLLLLLLLLL'
|
||||
header_size = struct.calcsize(fmt_header)
|
||||
debug( "fmt_header size = %d, +FAT = %d" % (header_size, header_size + 109*4) )
|
||||
debug("fmt_header size = %d, +FAT = %d" % (header_size, header_size + 109*4))
|
||||
header1 = header[:header_size]
|
||||
(
|
||||
self.Sig,
|
||||
|
@ -1299,7 +1295,7 @@ class OleFileIO(object):
|
|||
self.sectDifStart,
|
||||
self.csectDif
|
||||
) = struct.unpack(fmt_header, header1)
|
||||
debug( struct.unpack(fmt_header, header1))
|
||||
debug(struct.unpack(fmt_header, header1))
|
||||
|
||||
if self.Sig != MAGIC:
|
||||
# OLE signature should always be present
|
||||
|
@ -1307,47 +1303,47 @@ class OleFileIO(object):
|
|||
if self.clsid != bytearray(16):
|
||||
# according to AAF specs, CLSID should always be zero
|
||||
self.raise_defect(DEFECT_INCORRECT, "incorrect CLSID in OLE header")
|
||||
debug( "MinorVersion = %d" % self.MinorVersion )
|
||||
debug( "DllVersion = %d" % self.DllVersion )
|
||||
debug("MinorVersion = %d" % self.MinorVersion)
|
||||
debug("DllVersion = %d" % self.DllVersion)
|
||||
if self.DllVersion not in [3, 4]:
|
||||
# version 3: usual format, 512 bytes per sector
|
||||
# version 4: large format, 4K per sector
|
||||
self.raise_defect(DEFECT_INCORRECT, "incorrect DllVersion in OLE header")
|
||||
debug( "ByteOrder = %X" % self.ByteOrder )
|
||||
debug("ByteOrder = %X" % self.ByteOrder)
|
||||
if self.ByteOrder != 0xFFFE:
|
||||
# For now only common little-endian documents are handled correctly
|
||||
self.raise_defect(DEFECT_FATAL, "incorrect ByteOrder in OLE header")
|
||||
# TODO: add big-endian support for documents created on Mac ?
|
||||
# But according to [MS-CFB] ? v20140502, ByteOrder MUST be 0xFFFE.
|
||||
self.SectorSize = 2**self.SectorShift
|
||||
debug( "SectorSize = %d" % self.SectorSize )
|
||||
debug("SectorSize = %d" % self.SectorSize)
|
||||
if self.SectorSize not in [512, 4096]:
|
||||
self.raise_defect(DEFECT_INCORRECT, "incorrect SectorSize in OLE header")
|
||||
if (self.DllVersion==3 and self.SectorSize!=512) \
|
||||
or (self.DllVersion==4 and self.SectorSize!=4096):
|
||||
if (self.DllVersion == 3 and self.SectorSize != 512) \
|
||||
or (self.DllVersion == 4 and self.SectorSize != 4096):
|
||||
self.raise_defect(DEFECT_INCORRECT, "SectorSize does not match DllVersion in OLE header")
|
||||
self.MiniSectorSize = 2**self.MiniSectorShift
|
||||
debug( "MiniSectorSize = %d" % self.MiniSectorSize )
|
||||
debug("MiniSectorSize = %d" % self.MiniSectorSize)
|
||||
if self.MiniSectorSize not in [64]:
|
||||
self.raise_defect(DEFECT_INCORRECT, "incorrect MiniSectorSize in OLE header")
|
||||
if self.Reserved != 0 or self.Reserved1 != 0:
|
||||
self.raise_defect(DEFECT_INCORRECT, "incorrect OLE header (non-null reserved bytes)")
|
||||
debug( "csectDir = %d" % self.csectDir )
|
||||
debug("csectDir = %d" % self.csectDir)
|
||||
# Number of directory sectors (only allowed if DllVersion != 3)
|
||||
if self.SectorSize==512 and self.csectDir!=0:
|
||||
if self.SectorSize == 512 and self.csectDir != 0:
|
||||
self.raise_defect(DEFECT_INCORRECT, "incorrect csectDir in OLE header")
|
||||
debug( "csectFat = %d" % self.csectFat )
|
||||
debug("csectFat = %d" % self.csectFat)
|
||||
# csectFat = number of FAT sectors in the file
|
||||
debug( "sectDirStart = %X" % self.sectDirStart )
|
||||
debug("sectDirStart = %X" % self.sectDirStart)
|
||||
# sectDirStart = 1st sector containing the directory
|
||||
debug( "signature = %d" % self.signature )
|
||||
debug("signature = %d" % self.signature)
|
||||
# Signature should be zero, BUT some implementations do not follow this
|
||||
# rule => only a potential defect:
|
||||
# (according to MS-CFB, may be != 0 for applications supporting file
|
||||
# transactions)
|
||||
if self.signature != 0:
|
||||
self.raise_defect(DEFECT_POTENTIAL, "incorrect OLE header (signature>0)")
|
||||
debug( "MiniSectorCutoff = %d" % self.MiniSectorCutoff )
|
||||
debug("MiniSectorCutoff = %d" % self.MiniSectorCutoff)
|
||||
# MS-CFB: This integer field MUST be set to 0x00001000. This field
|
||||
# specifies the maximum size of a user-defined data stream allocated
|
||||
# from the mini FAT and mini stream, and that cutoff is 4096 bytes.
|
||||
|
@ -1355,15 +1351,15 @@ class OleFileIO(object):
|
|||
# must be allocated as normal sectors from the FAT.
|
||||
if self.MiniSectorCutoff != 0x1000:
|
||||
self.raise_defect(DEFECT_INCORRECT, "incorrect MiniSectorCutoff in OLE header")
|
||||
debug( "MiniFatStart = %X" % self.MiniFatStart )
|
||||
debug( "csectMiniFat = %d" % self.csectMiniFat )
|
||||
debug( "sectDifStart = %X" % self.sectDifStart )
|
||||
debug( "csectDif = %d" % self.csectDif )
|
||||
debug("MiniFatStart = %X" % self.MiniFatStart)
|
||||
debug("csectMiniFat = %d" % self.csectMiniFat)
|
||||
debug("sectDifStart = %X" % self.sectDifStart)
|
||||
debug("csectDif = %d" % self.csectDif)
|
||||
|
||||
# calculate the number of sectors in the file
|
||||
# (-1 because header doesn't count)
|
||||
self.nb_sect = ( (filesize + self.SectorSize-1) // self.SectorSize) - 1
|
||||
debug( "Number of sectors in the file: %d" % self.nb_sect )
|
||||
self.nb_sect = ((filesize + self.SectorSize-1) // self.SectorSize) - 1
|
||||
debug("Number of sectors in the file: %d" % self.nb_sect)
|
||||
#TODO: change this test, because an OLE file MAY contain other data
|
||||
# after the last sector.
|
||||
|
||||
|
@ -1393,14 +1389,12 @@ class OleFileIO(object):
|
|||
self.ministream = None
|
||||
self.minifatsect = self.MiniFatStart #i32(header, 60)
|
||||
|
||||
|
||||
def close(self):
|
||||
"""
|
||||
close the OLE file, to release the file object
|
||||
"""
|
||||
self.fp.close()
|
||||
|
||||
|
||||
def _check_duplicate_stream(self, first_sect, minifat=False):
|
||||
"""
|
||||
Checks if a stream has not been already referenced elsewhere.
|
||||
|
@ -1416,7 +1410,7 @@ class OleFileIO(object):
|
|||
else:
|
||||
debug('_check_duplicate_stream: sect=%d in FAT' % first_sect)
|
||||
# some values can be safely ignored (not a real stream):
|
||||
if first_sect in (DIFSECT,FATSECT,ENDOFCHAIN,FREESECT):
|
||||
if first_sect in (DIFSECT, FATSECT, ENDOFCHAIN, FREESECT):
|
||||
return
|
||||
used_streams = self._used_streams_fat
|
||||
#TODO: would it be more efficient using a dict or hash values, instead
|
||||
|
@ -1426,7 +1420,6 @@ class OleFileIO(object):
|
|||
else:
|
||||
used_streams.append(first_sect)
|
||||
|
||||
|
||||
def dumpfat(self, fat, firstindex=0):
|
||||
"Displays a part of FAT in human-readable form for debugging purpose"
|
||||
# [PL] added only for debug
|
||||
|
@ -1450,7 +1443,7 @@ class OleFileIO(object):
|
|||
index = l*VPL
|
||||
print("%8X:" % (firstindex+index), end=" ")
|
||||
for i in range(index, index+VPL):
|
||||
if i>=nbsect:
|
||||
if i >= nbsect:
|
||||
break
|
||||
sect = fat[i]
|
||||
aux = sect & 0xFFFFFFFF # JYTHON-WORKAROUND
|
||||
|
@ -1464,12 +1457,11 @@ class OleFileIO(object):
|
|||
print(name, end=" ")
|
||||
print()
|
||||
|
||||
|
||||
def dumpsect(self, sector, firstindex=0):
|
||||
"Displays a sector in a human-readable form, for debugging purpose."
|
||||
if not DEBUG_MODE:
|
||||
return
|
||||
VPL=8 # number of values per line (8+1 * 8+1 = 81)
|
||||
VPL = 8 # number of values per line (8+1 * 8+1 = 81)
|
||||
tab = array.array(UINT32, sector)
|
||||
if sys.byteorder == 'big':
|
||||
tab.byteswap()
|
||||
|
@ -1483,7 +1475,7 @@ class OleFileIO(object):
|
|||
index = l*VPL
|
||||
print("%8X:" % (firstindex+index), end=" ")
|
||||
for i in range(index, index+VPL):
|
||||
if i>=nbsect:
|
||||
if i >= nbsect:
|
||||
break
|
||||
sect = tab[i]
|
||||
name = "%8X" % sect
|
||||
|
@ -1501,7 +1493,6 @@ class OleFileIO(object):
|
|||
a.byteswap()
|
||||
return a
|
||||
|
||||
|
||||
def loadfat_sect(self, sect):
|
||||
"""
|
||||
Adds the indexes of the given sector to the FAT
|
||||
|
@ -1533,7 +1524,6 @@ class OleFileIO(object):
|
|||
self.fat = self.fat + nextfat
|
||||
return isect
|
||||
|
||||
|
||||
def loadfat(self, header):
|
||||
"""
|
||||
Load the FAT table.
|
||||
|
@ -1544,7 +1534,7 @@ class OleFileIO(object):
|
|||
# Additional sectors are described by DIF blocks
|
||||
|
||||
sect = header[76:512]
|
||||
debug( "len(sect)=%d, so %d integers" % (len(sect), len(sect)//4) )
|
||||
debug("len(sect)=%d, so %d integers" % (len(sect), len(sect)//4))
|
||||
#fat = []
|
||||
# [PL] FAT is an array of 32 bits unsigned ints, it's more effective
|
||||
# to use an array than a list in Python.
|
||||
|
@ -1554,7 +1544,7 @@ class OleFileIO(object):
|
|||
#self.dumpfat(self.fat)
|
||||
## for i in range(0, len(sect), 4):
|
||||
## ix = i32(sect, i)
|
||||
## #[PL] if ix == -2 or ix == -1: # ix == 0xFFFFFFFE or ix == 0xFFFFFFFF:
|
||||
## # [PL] if ix == -2 or ix == -1: # ix == 0xFFFFFFFE or ix == 0xFFFFFFFF:
|
||||
## if ix == 0xFFFFFFFE or ix == 0xFFFFFFFF:
|
||||
## break
|
||||
## s = self.getsect(ix)
|
||||
|
@ -1570,19 +1560,19 @@ class OleFileIO(object):
|
|||
if self.sectDifStart >= self.nb_sect:
|
||||
# initial DIFAT block index must be valid
|
||||
self.raise_defect(DEFECT_FATAL, 'incorrect DIFAT, first index out of range')
|
||||
debug( "DIFAT analysis..." )
|
||||
debug("DIFAT analysis...")
|
||||
# We compute the necessary number of DIFAT sectors :
|
||||
# Number of pointers per DIFAT sector = (sectorsize/4)-1
|
||||
# (-1 because the last pointer is the next DIFAT sector number)
|
||||
nb_difat_sectors = (self.sectorsize//4)-1
|
||||
# (if 512 bytes: each DIFAT sector = 127 pointers + 1 towards next DIFAT sector)
|
||||
nb_difat = (self.csectFat-109 + nb_difat_sectors-1)//nb_difat_sectors
|
||||
debug( "nb_difat = %d" % nb_difat )
|
||||
debug("nb_difat = %d" % nb_difat)
|
||||
if self.csectDif != nb_difat:
|
||||
raise IOError('incorrect DIFAT')
|
||||
isect_difat = self.sectDifStart
|
||||
for i in iterrange(nb_difat):
|
||||
debug( "DIFAT block %d, sector %X" % (i, isect_difat) )
|
||||
debug("DIFAT block %d, sector %X" % (i, isect_difat))
|
||||
#TODO: check if corresponding FAT SID = DIFSECT
|
||||
sector_difat = self.getsect(isect_difat)
|
||||
difat = self.sect2array(sector_difat)
|
||||
|
@ -1590,7 +1580,7 @@ class OleFileIO(object):
|
|||
self.loadfat_sect(difat[:nb_difat_sectors])
|
||||
# last DIFAT pointer is next DIFAT sector:
|
||||
isect_difat = difat[nb_difat_sectors]
|
||||
debug( "next DIFAT sector: %X" % isect_difat )
|
||||
debug("next DIFAT sector: %X" % isect_difat)
|
||||
# checks:
|
||||
if isect_difat not in [ENDOFCHAIN, FREESECT]:
|
||||
# last DIFAT pointer value must be ENDOFCHAIN or FREESECT
|
||||
|
@ -1608,7 +1598,6 @@ class OleFileIO(object):
|
|||
debug('\nFAT:')
|
||||
self.dumpfat(self.fat)
|
||||
|
||||
|
||||
def loadminifat(self):
|
||||
"""
|
||||
Load the MiniFAT table.
|
||||
|
@ -1633,8 +1622,8 @@ class OleFileIO(object):
|
|||
self.raise_defect(DEFECT_INCORRECT, 'OLE MiniStream is larger than MiniFAT')
|
||||
# In any case, first read stream_size:
|
||||
s = self._open(self.minifatsect, stream_size, force_FAT=True).read()
|
||||
#[PL] Old code replaced by an array:
|
||||
#self.minifat = [i32(s, i) for i in range(0, len(s), 4)]
|
||||
# [PL] Old code replaced by an array:
|
||||
# self.minifat = [i32(s, i) for i in range(0, len(s), 4)]
|
||||
self.minifat = self.sect2array(s)
|
||||
# Then shrink the array to used size, to avoid indexes out of MiniStream:
|
||||
debug('MiniFAT shrunk from %d to %d sectors' % (len(self.minifat), nb_minisectors))
|
||||
|
@ -1658,9 +1647,9 @@ class OleFileIO(object):
|
|||
|
||||
# [PL] the original code in PIL was wrong when sectors are 4KB instead of
|
||||
# 512 bytes:
|
||||
#self.fp.seek(512 + self.sectorsize * sect)
|
||||
#[PL]: added safety checks:
|
||||
#print("getsect(%X)" % sect)
|
||||
# self.fp.seek(512 + self.sectorsize * sect)
|
||||
# [PL]: added safety checks:
|
||||
# print("getsect(%X)" % sect)
|
||||
try:
|
||||
self.fp.seek(self.sectorsize * (sect+1))
|
||||
except:
|
||||
|
@ -1674,7 +1663,6 @@ class OleFileIO(object):
|
|||
self.raise_defect(DEFECT_FATAL, 'incomplete OLE sector')
|
||||
return sector
|
||||
|
||||
|
||||
def write_sect(self, sect, data, padding=b'\x00'):
|
||||
"""
|
||||
Write given sector to file on disk.
|
||||
|
@ -1685,7 +1673,7 @@ class OleFileIO(object):
|
|||
"""
|
||||
if not isinstance(data, bytes):
|
||||
raise TypeError("write_sect: data must be a bytes string")
|
||||
if not isinstance(padding, bytes) or len(padding)!=1:
|
||||
if not isinstance(padding, bytes) or len(padding) != 1:
|
||||
raise TypeError("write_sect: padding must be a bytes string of 1 char")
|
||||
#TODO: we could allow padding=None for no padding at all
|
||||
try:
|
||||
|
@ -1701,7 +1689,6 @@ class OleFileIO(object):
|
|||
raise ValueError("Data is larger than sector size")
|
||||
self.fp.write(data)
|
||||
|
||||
|
||||
def loaddirectory(self, sect):
|
||||
"""
|
||||
Load the directory.
|
||||
|
@ -1715,14 +1702,14 @@ class OleFileIO(object):
|
|||
# (stream size is not known in advance)
|
||||
self.directory_fp = self._open(sect)
|
||||
|
||||
#[PL] to detect malformed documents and avoid DoS attacks, the maximum
|
||||
# [PL] to detect malformed documents and avoid DoS attacks, the maximum
|
||||
# number of directory entries can be calculated:
|
||||
max_entries = self.directory_fp.size // 128
|
||||
debug('loaddirectory: size=%d, max_entries=%d' %
|
||||
(self.directory_fp.size, max_entries))
|
||||
|
||||
# Create list of directory entries
|
||||
#self.direntries = []
|
||||
# self.direntries = []
|
||||
# We start with a list of "None" object
|
||||
self.direntries = [None] * max_entries
|
||||
## for sid in iterrange(max_entries):
|
||||
|
@ -1737,8 +1724,7 @@ class OleFileIO(object):
|
|||
# read and build all storage trees, starting from the root:
|
||||
self.root.build_storage_tree()
|
||||
|
||||
|
||||
def _load_direntry (self, sid):
|
||||
def _load_direntry(self, sid):
|
||||
"""
|
||||
Load a directory entry from the directory.
|
||||
This method should only be called once for each storage/stream when
|
||||
|
@ -1750,7 +1736,7 @@ class OleFileIO(object):
|
|||
:exception IOError: if the entry has always been referenced.
|
||||
"""
|
||||
# check if SID is OK:
|
||||
if sid<0 or sid>=len(self.direntries):
|
||||
if sid < 0 or sid >= len(self.direntries):
|
||||
self.raise_defect(DEFECT_FATAL, "OLE directory index out of range")
|
||||
# check if entry was already referenced:
|
||||
if self.direntries[sid] is not None:
|
||||
|
@ -1763,14 +1749,12 @@ class OleFileIO(object):
|
|||
self.direntries[sid] = _OleDirectoryEntry(entry, sid, self)
|
||||
return self.direntries[sid]
|
||||
|
||||
|
||||
def dumpdirectory(self):
|
||||
"""
|
||||
Dump directory (for debugging only)
|
||||
"""
|
||||
self.root.dump()
|
||||
|
||||
|
||||
def _open(self, start, size = 0x7FFFFFFF, force_FAT=False):
|
||||
"""
|
||||
Open a stream, either in FAT or MiniFAT according to its size.
|
||||
|
@ -1806,7 +1790,6 @@ class OleFileIO(object):
|
|||
sectorsize=self.sectorsize, fat=self.fat,
|
||||
filesize=self._filesize)
|
||||
|
||||
|
||||
def _list(self, files, prefix, node, streams=True, storages=False):
|
||||
"""
|
||||
listdir helper
|
||||
|
@ -1835,7 +1818,6 @@ class OleFileIO(object):
|
|||
else:
|
||||
self.raise_defect(DEFECT_INCORRECT, 'The directory tree contains an entry which is not a stream nor a storage.')
|
||||
|
||||
|
||||
def listdir(self, streams=True, storages=False):
|
||||
"""
|
||||
Return a list of streams and/or storages stored in this file
|
||||
|
@ -1849,7 +1831,6 @@ class OleFileIO(object):
|
|||
self._list(files, [], self.root, streams, storages)
|
||||
return files
|
||||
|
||||
|
||||
def _find(self, filename):
|
||||
"""
|
||||
Returns directory entry of given filename. (openstream helper)
|
||||
|
@ -1881,7 +1862,6 @@ class OleFileIO(object):
|
|||
node = kid
|
||||
return node.sid
|
||||
|
||||
|
||||
def openstream(self, filename):
|
||||
"""
|
||||
Open a stream as a read-only file object (BytesIO).
|
||||
|
@ -1903,7 +1883,6 @@ class OleFileIO(object):
|
|||
raise IOError("this file is not a stream")
|
||||
return self._open(entry.isectStart, entry.size)
|
||||
|
||||
|
||||
def write_stream(self, stream_name, data):
|
||||
"""
|
||||
Write a stream to disk. For now, it is only possible to replace an
|
||||
|
@ -1942,29 +1921,28 @@ class OleFileIO(object):
|
|||
# (sect, offset+self.sectorsize*sect))
|
||||
# raise IOError('OLE sector index out of range')
|
||||
# extract one sector from data, the last one being smaller:
|
||||
if i<(nb_sectors-1):
|
||||
data_sector = data [i*self.sectorsize : (i+1)*self.sectorsize]
|
||||
if i < (nb_sectors-1):
|
||||
data_sector = data[i*self.sectorsize:(i+1)*self.sectorsize]
|
||||
#TODO: comment this if it works
|
||||
assert(len(data_sector)==self.sectorsize)
|
||||
assert(len(data_sector) == self.sectorsize)
|
||||
else:
|
||||
data_sector = data [i*self.sectorsize:]
|
||||
#TODO: comment this if it works
|
||||
data_sector = data[i*self.sectorsize:]
|
||||
# TODO: comment this if it works
|
||||
debug('write_stream: size=%d sectorsize=%d data_sector=%d size%%sectorsize=%d'
|
||||
% (size, self.sectorsize, len(data_sector), size % self.sectorsize))
|
||||
assert(len(data_sector) % self.sectorsize==size % self.sectorsize)
|
||||
assert(len(data_sector) % self.sectorsize == size % self.sectorsize)
|
||||
self.write_sect(sect, data_sector)
|
||||
## self.fp.write(data_sector)
|
||||
# self.fp.write(data_sector)
|
||||
# jump to next sector in the FAT:
|
||||
try:
|
||||
sect = self.fat[sect]
|
||||
except IndexError:
|
||||
# [PL] if pointer is out of the FAT an exception is raised
|
||||
raise IOError('incorrect OLE FAT, sector index out of range')
|
||||
#[PL] Last sector should be a "end of chain" marker:
|
||||
# [PL] Last sector should be a "end of chain" marker:
|
||||
if sect != ENDOFCHAIN:
|
||||
raise IOError('incorrect last sector index in OLE stream')
|
||||
|
||||
|
||||
def get_type(self, filename):
|
||||
"""
|
||||
Test if given filename exists as a stream or a storage in the OLE
|
||||
|
@ -1984,7 +1962,6 @@ class OleFileIO(object):
|
|||
except:
|
||||
return False
|
||||
|
||||
|
||||
def getmtime(self, filename):
|
||||
"""
|
||||
Return modification time of a stream/storage.
|
||||
|
@ -2000,7 +1977,6 @@ class OleFileIO(object):
|
|||
entry = self.direntries[sid]
|
||||
return entry.getmtime()
|
||||
|
||||
|
||||
def getctime(self, filename):
|
||||
"""
|
||||
Return creation time of a stream/storage.
|
||||
|
@ -2016,7 +1992,6 @@ class OleFileIO(object):
|
|||
entry = self.direntries[sid]
|
||||
return entry.getctime()
|
||||
|
||||
|
||||
def exists(self, filename):
|
||||
"""
|
||||
Test if given filename exists as a stream or a storage in the OLE
|
||||
|
@ -2032,7 +2007,6 @@ class OleFileIO(object):
|
|||
except:
|
||||
return False
|
||||
|
||||
|
||||
def get_size(self, filename):
|
||||
"""
|
||||
Return size of a stream in the OLE container, in bytes.
|
||||
|
@ -2049,7 +2023,6 @@ class OleFileIO(object):
|
|||
raise TypeError('object is not an OLE stream')
|
||||
return entry.size
|
||||
|
||||
|
||||
def get_rootentry_name(self):
|
||||
"""
|
||||
Return root entry name. Should usually be 'Root Entry' or 'R' in most
|
||||
|
@ -2057,7 +2030,6 @@ class OleFileIO(object):
|
|||
"""
|
||||
return self.root.name
|
||||
|
||||
|
||||
def getproperties(self, filename, convert_time=False, no_conversion=None):
|
||||
"""
|
||||
Return properties described in substream.
|
||||
|
@ -2069,7 +2041,7 @@ class OleFileIO(object):
|
|||
|
||||
:returns: a dictionary of values indexed by id (integer)
|
||||
"""
|
||||
#REFERENCE: [MS-OLEPS] https://msdn.microsoft.com/en-us/library/dd942421.aspx
|
||||
# REFERENCE: [MS-OLEPS] https://msdn.microsoft.com/en-us/library/dd942421.aspx
|
||||
# make sure no_conversion is a list, just to simplify code below:
|
||||
if no_conversion is None:
|
||||
no_conversion = []
|
||||
|
@ -2112,7 +2084,7 @@ class OleFileIO(object):
|
|||
offset = i32(s, 12+i*8)
|
||||
type = i32(s, offset)
|
||||
|
||||
debug ('property id=%d: type=%d offset=%X' % (id, type, offset))
|
||||
debug('property id=%d: type=%d offset=%X' % (id, type, offset))
|
||||
|
||||
# test for common types first (should perhaps use
|
||||
# a dictionary instead?)
|
||||
|
@ -2121,14 +2093,14 @@ class OleFileIO(object):
|
|||
value = i16(s, offset+4)
|
||||
if value >= 32768:
|
||||
value = value - 65536
|
||||
elif type == VT_UI2: # 2-byte unsigned integer
|
||||
elif type == VT_UI2: # 2-byte unsigned integer
|
||||
value = i16(s, offset+4)
|
||||
elif type in (VT_I4, VT_INT, VT_ERROR):
|
||||
# VT_I4: 32-bit signed integer
|
||||
# VT_ERROR: HRESULT, similar to 32-bit signed integer,
|
||||
# see http://msdn.microsoft.com/en-us/library/cc230330.aspx
|
||||
value = i32(s, offset+4)
|
||||
elif type in (VT_UI4, VT_UINT): # 4-byte unsigned integer
|
||||
elif type in (VT_UI4, VT_UINT): # 4-byte unsigned integer
|
||||
value = i32(s, offset+4) # FIXME
|
||||
elif type in (VT_BSTR, VT_LPSTR):
|
||||
# CodePageString, see http://msdn.microsoft.com/en-us/library/dd942354.aspx
|
||||
|
@ -2152,12 +2124,12 @@ class OleFileIO(object):
|
|||
count = i32(s, offset+4)
|
||||
value = self._decode_utf16_str(s[offset+8:offset+8+count*2])
|
||||
elif type == VT_FILETIME:
|
||||
value = long(i32(s, offset+4)) + (long(i32(s, offset+8))<<32)
|
||||
value = long(i32(s, offset+4)) + (long(i32(s, offset+8)) << 32)
|
||||
# FILETIME is a 64-bit int: "number of 100ns periods
|
||||
# since Jan 1,1601".
|
||||
if convert_time and id not in no_conversion:
|
||||
debug('Converting property #%d to python datetime, value=%d=%fs'
|
||||
%(id, value, float(value)/10000000))
|
||||
% (id, value, float(value) / 10000000))
|
||||
# convert FILETIME to Python datetime.datetime
|
||||
# inspired from http://code.activestate.com/recipes/511425-filetime-to-datetime/
|
||||
_FILETIME_null_date = datetime.datetime(1601, 1, 1, 0, 0, 0)
|
||||
|
@ -2182,7 +2154,7 @@ class OleFileIO(object):
|
|||
value = bool(i16(s, offset+4))
|
||||
else:
|
||||
value = None # everything else yields "None"
|
||||
debug ('property id=%d: type=%d not implemented in parser yet' % (id, type))
|
||||
debug('property id=%d: type=%d not implemented in parser yet' % (id, type))
|
||||
|
||||
# missing: VT_EMPTY, VT_NULL, VT_R4, VT_R8, VT_CY, VT_DATE,
|
||||
# VT_DECIMAL, VT_I1, VT_I8, VT_UI8,
|
||||
|
@ -2194,8 +2166,8 @@ class OleFileIO(object):
|
|||
# type of items, e.g. VT_VECTOR|VT_BSTR
|
||||
# see http://msdn.microsoft.com/en-us/library/dd942011.aspx
|
||||
|
||||
#print("%08x" % id, repr(value), end=" ")
|
||||
#print("(%s)" % VT[i32(s, offset) & 0xFFF])
|
||||
# print("%08x" % id, repr(value), end=" ")
|
||||
# print("(%s)" % VT[i32(s, offset) & 0xFFF])
|
||||
|
||||
data[id] = value
|
||||
except BaseException as exc:
|
||||
|
@ -2267,14 +2239,14 @@ For more information, see http://www.decalage.info/olefile
|
|||
props = ole.getproperties(streamname, convert_time=True)
|
||||
props = sorted(props.items())
|
||||
for k, v in props:
|
||||
#[PL]: avoid to display too large or binary values:
|
||||
# [PL]: avoid to display too large or binary values:
|
||||
if isinstance(v, (basestring, bytes)):
|
||||
if len(v) > 50:
|
||||
v = v[:50]
|
||||
if isinstance(v, bytes):
|
||||
# quick and dirty binary check:
|
||||
for c in (1,2,3,4,5,6,7,11,12,14,15,16,17,18,19,20,
|
||||
21,22,23,24,25,26,27,28,29,30,31):
|
||||
for c in (1, 2, 3, 4, 5, 6, 7, 11, 12, 14, 15, 16, 17, 18, 19, 20,
|
||||
21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31):
|
||||
if c in bytearray(v):
|
||||
v = '(binary data)'
|
||||
break
|
||||
|
@ -2285,7 +2257,7 @@ For more information, see http://www.decalage.info/olefile
|
|||
print('\nChecking streams...')
|
||||
for streamname in ole.listdir():
|
||||
# print name using repr() to convert binary chars to \xNN:
|
||||
print('-', repr('/'.join(streamname)),'-', end=' ')
|
||||
print('-', repr('/'.join(streamname)), '-', end=' ')
|
||||
st_type = ole.get_type(streamname)
|
||||
if st_type == STGTY_STREAM:
|
||||
print('size %d' % ole.get_size(streamname))
|
||||
|
@ -2295,11 +2267,11 @@ For more information, see http://www.decalage.info/olefile
|
|||
print('NOT a stream : type=%d' % st_type)
|
||||
print()
|
||||
|
||||
## for streamname in ole.listdir():
|
||||
## # print name using repr() to convert binary chars to \xNN:
|
||||
## print('-', repr('/'.join(streamname)),'-', end=' ')
|
||||
## print(ole.getmtime(streamname))
|
||||
## print()
|
||||
# for streamname in ole.listdir():
|
||||
# # print name using repr() to convert binary chars to \xNN:
|
||||
# print('-', repr('/'.join(streamname)),'-', end=' ')
|
||||
# print(ole.getmtime(streamname))
|
||||
# print()
|
||||
|
||||
print('Modification/Creation times of all directory entries:')
|
||||
for entry in ole.direntries:
|
||||
|
@ -2312,7 +2284,7 @@ For more information, see http://www.decalage.info/olefile
|
|||
meta = ole.get_metadata()
|
||||
meta.dump()
|
||||
print()
|
||||
#[PL] Test a few new methods:
|
||||
# [PL] Test a few new methods:
|
||||
root = ole.get_rootentry_name()
|
||||
print('Root entry name: "%s"' % root)
|
||||
if ole.exists('worddocument'):
|
||||
|
@ -2332,4 +2304,4 @@ For more information, see http://www.decalage.info/olefile
|
|||
## except IOError as v:
|
||||
## print("***", "cannot read", file, "-", v)
|
||||
|
||||
# this code was developed while listening to The Wedding Present "Sea Monsters"
|
||||
# this code was developed while listening to The Wedding Present "Sea Monsters"
|
||||
|
|
Loading…
Reference in New Issue
Block a user