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100 lines
3.3 KiB
Python
100 lines
3.3 KiB
Python
from hachoir.field import BasicFieldSet, GenericFieldSet, ParserError, createRawField
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# getgaps(int, int, [listof (int, int)]) -> generator of (int, int)
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# Gets all the gaps not covered by a block in `blocks` from `start` for
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# `length` units.
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def getgaps(start, length, blocks):
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'''
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Example:
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>>> list(getgaps(0, 20, [(15,3), (6,2), (6,2), (1,2), (2,3), (11,2), (9,5)]))
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[(0, 1), (5, 1), (8, 1), (14, 1), (18, 2)]
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'''
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# done this way to avoid mutating the original
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blocks = sorted(blocks, key=lambda b: b[0])
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end = start + length
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for s, l in blocks:
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if s > start:
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yield (start, s - start)
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start = s
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if s + l > start:
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start = s + l
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if start < end:
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yield (start, end - start)
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class RootSeekableFieldSet(GenericFieldSet):
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def close(self):
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self.stream.close()
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def __enter__(self):
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return self
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def __exit__(self, type, value, traceback):
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self.close()
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def seekBit(self, address, relative=True):
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if not relative:
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address -= self.absolute_address
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if address < 0:
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raise ParserError(
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"Seek below field set start (%s.%s)" % divmod(address, 8))
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self._current_size = address
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return None
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def seekByte(self, address, relative=True):
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return self.seekBit(address * 8, relative)
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def _fixLastField(self):
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"""
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Try to fix last field when we know current field set size.
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Returns new added field if any, or None.
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"""
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assert self._size is not None
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# Stop parser
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message = ["stop parser"]
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self._field_generator = None
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# If last field is too big, delete it
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while self._size < self._current_size:
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field = self._deleteField(len(self._fields) - 1)
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message.append("delete field %s" % field.path)
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assert self._current_size <= self._size
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blocks = [(x.absolute_address, x.size) for x in self._fields]
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fields = []
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self._size = max(self._size, max(
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a + b for a, b in blocks) - self.absolute_address)
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for start, length in getgaps(self.absolute_address, self._size, blocks):
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self.seekBit(start, relative=False)
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field = createRawField(self, length, "unparsed[]")
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self.setUniqueFieldName(field)
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self._fields.append(field.name, field)
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fields.append(field)
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message.append(
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"found unparsed segment: start %s, length %s" % (start, length))
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self.seekBit(self._size + self.absolute_address, relative=False)
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message = ", ".join(message)
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if fields:
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self.warning("[Autofix] Fix parser error: " + message)
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return fields
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def _stopFeeding(self):
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new_field = None
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if self._size is None:
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if self._parent:
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self._size = self._current_size
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new_field = self._fixLastField()
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self._field_generator = None
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return new_field
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class SeekableFieldSet(RootSeekableFieldSet):
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def __init__(self, parent, name, description=None, size=None):
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assert issubclass(parent.__class__, BasicFieldSet)
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RootSeekableFieldSet.__init__(
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self, parent, name, parent.stream, description, size)
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