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64 lines
2 KiB
Python
64 lines
2 KiB
Python
from hachoir.field import (FieldError,
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RawBits, RawBytes,
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PaddingBits, PaddingBytes,
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NullBits, NullBytes,
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GenericString, GenericInteger)
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from hachoir.stream import FileOutputStream
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def createRawField(parent, size, name="raw[]", description=None):
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if size <= 0:
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raise FieldError("Unable to create raw field of %s bits" % size)
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if (size % 8) == 0:
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return RawBytes(parent, name, size // 8, description)
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else:
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return RawBits(parent, name, size, description)
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def createPaddingField(parent, nbits, name="padding[]", description=None):
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if nbits <= 0:
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raise FieldError("Unable to create padding of %s bits" % nbits)
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if (nbits % 8) == 0:
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return PaddingBytes(parent, name, nbits // 8, description)
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else:
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return PaddingBits(parent, name, nbits, description)
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def createNullField(parent, nbits, name="padding[]", description=None):
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if nbits <= 0:
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raise FieldError("Unable to create null padding of %s bits" % nbits)
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if (nbits % 8) == 0:
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return NullBytes(parent, name, nbits // 8, description)
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else:
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return NullBits(parent, name, nbits, description)
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def isString(field):
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return issubclass(field.__class__, GenericString)
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def isInteger(field):
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return issubclass(field.__class__, GenericInteger)
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def writeIntoFile(fieldset, filename):
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output = FileOutputStream(filename)
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with output:
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fieldset.writeInto(output)
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def createOrphanField(fieldset, address, field_cls, *args, **kw):
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"""
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Create an orphan field at specified address:
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field_cls(fieldset, *args, **kw)
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The field uses the fieldset properties but it isn't added to the
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field set.
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"""
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save_size = fieldset._current_size
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try:
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fieldset._current_size = address
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field = field_cls(fieldset, *args, **kw)
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finally:
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fieldset._current_size = save_size
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return field
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