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