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72 lines
2 KiB
Python
72 lines
2 KiB
Python
"""
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Very basic field: raw content with a size in byte. Use this class for
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unknown content.
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"""
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from hachoir.field import Field, FieldError
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from hachoir.core.tools import makePrintable
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from hachoir.core import config
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MAX_LENGTH = (2**64)
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class RawBytes(Field):
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"""
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Byte vector of unknown content
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@see: L{Bytes}
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"""
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static_size = staticmethod(lambda *args, **kw: args[1] * 8)
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def __init__(self, parent, name, length, description="Raw data"):
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assert issubclass(parent.__class__, Field)
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if not(0 < length <= MAX_LENGTH):
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raise FieldError("Invalid RawBytes length (%s)!" % length)
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Field.__init__(self, parent, name, length * 8, description)
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self._display = None
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def _createDisplay(self, human):
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max_bytes = config.max_byte_length
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try:
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display = makePrintable(self.value[:max_bytes], "ASCII")
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except Exception:
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if self._display is None:
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address = self.absolute_address
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length = min(self._size // 8, max_bytes)
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self._display = self._parent.stream.readBytes(address, length)
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display = makePrintable(self._display, "ASCII")
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truncated = (8 * len(display) < self._size)
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if human:
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if truncated:
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display += "(...)"
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return makePrintable(display, "latin-1", quote='"')
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else:
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if truncated:
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return '"%s(...)"' % display
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else:
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return '"%s"' % display
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def createDisplay(self):
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return self._createDisplay(True)
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def createRawDisplay(self):
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return self._createDisplay(False)
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def hasValue(self):
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return True
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def createValue(self):
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assert (self._size % 8) == 0
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if self._display:
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self._display = None
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return self._parent.stream.readBytes(
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self.absolute_address, self._size // 8)
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class Bytes(RawBytes):
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"""
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Byte vector: can be used for magic number or GUID/UUID for example.
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@see: L{RawBytes}
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"""
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pass
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