SickGear/lib/hachoir/field/padding.py
JackDandy 980e05cc99 Change Hachoir can't support PY2 so backport their PY3 to prevent a need for system dependant external binaries like mediainfo.
Backported 400 revisions from rev 1de4961-8897c5b (2018-2014).
Move core/benchmark, core/cmd_line, core/memory, core/profiler and core/timeout to core/optional/*
Remove metadata/qt*

PORT: Version 2.0a3 (inline with 3.0a3 @ f80c7d5).
Basic Support for XMP Packets.
tga: improvements to adhere more closely to the spec.
pdf: slightly improved parsing.
rar: fix TypeError on unknown block types.
Add MacRoman win32 codepage.
tiff/exif: support SubIFDs and tiled images.
Add method to export metadata in dictionary.
mpeg_video: don't attempt to parse Stream past length.
mpeg_video: parse ESCR correctly, add SCR value.
Change centralise CustomFragments.
field: don't set parser class if class is None, to enable autodetect.
field: add value/display for CustomFragment.
parser: inline warning to enable tracebacks in debug mode.
Fix empty bytestrings in makePrintable.
Fix contentSize in jpeg.py to account for image_data blocks.
Fix the ELF parser.
Enhance the AR archive parser.
elf parser: fix wrong wrong fields order in parsing little endian section flags.
elf parser: add s390 as a machine type.
Flesh out mp4 parser.

PORT: Version 2.0a1 (inline with 3.0a1).
Major refactoring and PEP8.
Fix ResourceWarning warnings on files. Add a close() method and support for the context manager protocol ("with obj: ...") to parsers, input and output streams.
metadata: get comment from ZIP.
Support for InputIOStream.read(0).
Fix sizeGe when size is None.
Remove unused new_seekable_field_set file.
Remove parser Mapsforge .map.
Remove parser Parallel Realities Starfighter .pak files.
sevenzip: fix for newer archives.
java: update access flags and modifiers for Java 1.7 and update description text for most recent Java.
Support ustar prefix field in tar archives.
Remove file_system* parsers.
Remove misc parsers 3d0, 3ds, gnome_keyring, msoffice*, mstask, ole*, word*.
Remove program parsers macho, nds, prc.
Support non-8bit Character subclasses.
Python parser supports Python 3.7.
Enhance mpeg_ts parser to support MTS/M2TS.
Support for creation date in tiff.
Change don't hardcode errno constant.

PORT: 1.9.1
Internal Only: The following are legacy reference to upstream commit messages.
Relevant changes up to b0a115f8.
Use integer division.
Replace HACHOIR_ERRORS with Exception.
Fix metadata.Data: make it sortable.
Import fixes from e7de492.
PORT: Version 2.0a1 (inline with 3.0a1 @ e9f8fad).
Replace hachoir.core.field with hachoir.field
Replace hachoir.core.stream with hachoir.stream
Remove the compatibility module for PY1.5 to PY2.5.
metadata: support TIFF picture.
metadata: fix string normalization.
metadata: fix datetime regex Fix hachoir bug #57.
FileFromInputStream: fix comparison between None and an int.
InputIOStream: open the file in binary mode.
2018-03-28 00:43:11 +01:00

142 lines
4.4 KiB
Python

from hachoir.field import Bits, Bytes
from hachoir.core.tools import makePrintable, humanFilesize
from hachoir.core import config
class PaddingBits(Bits):
"""
Padding bits used, for example, to align address (of next field).
See also NullBits and PaddingBytes types.
Arguments:
* nbits: Size of the field in bits
Optional arguments:
* pattern (int): Content pattern, eg. 0 if all bits are set to 0
"""
static_size = staticmethod(lambda *args, **kw: args[1])
MAX_SIZE = 128
def __init__(self, parent, name, nbits, description="Padding", pattern=None):
Bits.__init__(self, parent, name, nbits, description)
self.pattern = pattern
self._display_pattern = self.checkPattern()
def checkPattern(self):
if not (config.check_padding_pattern):
return False
if self.pattern != 0:
return False
if self.MAX_SIZE < self._size:
value = self._parent.stream.readBits(
self.absolute_address, self.MAX_SIZE, self._parent.endian)
else:
value = self.value
if value != 0:
self.warning("padding contents doesn't look normal (invalid pattern)")
return False
if self.MAX_SIZE < self._size:
self.info("only check first %u bits" % self.MAX_SIZE)
return True
def createDisplay(self):
if self._display_pattern:
return u"<padding pattern=%s>" % self.pattern
else:
return Bits.createDisplay(self)
class PaddingBytes(Bytes):
"""
Padding bytes used, for example, to align address (of next field).
See also NullBytes and PaddingBits types.
Arguments:
* nbytes: Size of the field in bytes
Optional arguments:
* pattern (str): Content pattern, eg. "\0" for nul bytes
"""
static_size = staticmethod(lambda *args, **kw: args[1] * 8)
MAX_SIZE = 4096
def __init__(self, parent, name, nbytes,
description="Padding", pattern=None):
""" pattern is None or repeated string """
assert (pattern is None) or (isinstance(pattern, str))
Bytes.__init__(self, parent, name, nbytes, description)
self.pattern = pattern
self._display_pattern = self.checkPattern()
def checkPattern(self):
if not (config.check_padding_pattern):
return False
if self.pattern is None:
return False
if self.MAX_SIZE < self._size // 8:
self.info("only check first %s of padding" % humanFilesize(self.MAX_SIZE))
content = self._parent.stream.readBytes(
self.absolute_address, self.MAX_SIZE)
else:
content = self.value
index = 0
pattern_len = len(self.pattern)
while index < len(content):
if content[index:index + pattern_len] != self.pattern:
self.warning(
"padding contents doesn't look normal"
" (invalid pattern at byte %u)!"
% index)
return False
index += pattern_len
return True
def createDisplay(self):
if self._display_pattern:
return u"<padding pattern=%s>" % makePrintable(self.pattern, "ASCII", quote="'")
else:
return Bytes.createDisplay(self)
def createRawDisplay(self):
return Bytes.createDisplay(self)
class NullBits(PaddingBits):
"""
Null padding bits used, for example, to align address (of next field).
See also PaddingBits and NullBytes types.
Arguments:
* nbits: Size of the field in bits
"""
def __init__(self, parent, name, nbits, description=None):
PaddingBits.__init__(self, parent, name, nbits, description, pattern=0)
def createDisplay(self):
if self._display_pattern:
return "<null>"
else:
return Bits.createDisplay(self)
class NullBytes(PaddingBytes):
"""
Null padding bytes used, for example, to align address (of next field).
See also PaddingBytes and NullBits types.
Arguments:
* nbytes: Size of the field in bytes
"""
def __init__(self, parent, name, nbytes, description=None):
PaddingBytes.__init__(self, parent, name, nbytes, description, pattern="\0")
def createDisplay(self):
if self._display_pattern:
return "<null>"
else:
return Bytes.createDisplay(self)