File: //lib/python3.9/site-packages/elftools/construct/__pycache__/adapters.cpython-39.opt-1.pyc
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�BitIntegerAdaptera�
Adapter for bit-integers (converts bitstrings to integers, and vice versa).
See BitField.
Parameters:
* subcon - the subcon to adapt
* width - the size of the subcon, in bits
* swapped - whether to swap byte order (little endian/big endian).
default is False (big endian)
* signed - whether the value is signed (two's complement). the default
is False (unsigned)
* bytesize - number of bits per byte, used for byte-swapping (if swapped).
default is 8.
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�MappingAdaptera�
Adapter that maps objects to other objects.
See SymmetricMapping and Enum.
Parameters:
* subcon - the subcon to map
* decoding - the decoding (parsing) mapping (a dict)
* encoding - the encoding (building) mapping (a dict)
* decdefault - the default return value when the object is not found
in the decoding mapping. if no object is given, an exception is raised.
if `Pass` is used, the unmapped object will be passed as-is
* encdefault - the default return value when the object is not found
in the encoding mapping. if no object is given, an exception is raised.
if `Pass` is used, the unmapped object will be passed as-is
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� FlagsAdaptera
Adapter for flag fields. Each flag is extracted from the number, resulting
in a FlagsContainer object. Not intended for direct usage.
See FlagsEnum.
Parameters
* subcon - the subcon to extract
* flags - a dictionary mapping flag-names to their value
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StringAdapteraA
Adapter for strings. Converts a sequence of characters into a python
string, and optionally handles character encoding.
See String.
Parameters:
* subcon - the subcon to convert
* encoding - the character encoding name (e.g., "utf8"), or None to
return raw bytes (usually 8-bit ASCII).
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�PaddedStringAdaptera�
Adapter for padded strings.
See String.
Parameters:
* subcon - the subcon to adapt
* padchar - the padding character. default is b"\x00".
* paddir - the direction where padding is placed ("right", "left", or
"center"). the default is "right".
* trimdir - the direction where trimming will take place ("right" or
"left"). the default is "right". trimming is only meaningful for
building, when the given string is too long.
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r? c @ s$ e Zd ZdZg Zdd� Zdd� ZdS )�LengthValueAdapterz�
Adapter for length-value pairs. It extracts only the value from the
pair, and calculates the length based on the value.
See PrefixedArray and PascalString.
Parameters:
* subcon - the subcon returning a length-value pair
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� ZdS ) �CStringAdapterar
Adapter for C-style strings (strings terminated by a terminator char).
Parameters:
* subcon - the subcon to convert
* terminators - a sequence of terminator chars. default is b"\x00".
* encoding - the character encoding to use (e.g., "utf8"), or None to
return raw-bytes. the terminator characters are not affected by the
encoding.
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TunnelAdapteraC
Adapter for tunneling (as in protocol tunneling). A tunnel is construct
nested upon another (layering). For parsing, the lower layer first parses
the data (note: it must return a string!), then the upper layer is called
to parse that data (bottom-up). For building it works in a top-down manner;
first the upper layer builds the data, then the lower layer takes it and
writes it to the stream.
Parameters:
* subcon - the lower layer subcon
* inner_subcon - the upper layer (tunneled/nested) subcon
Example:
# a pascal string containing compressed data (zlib encoding), so first
# the string is read, decompressed, and finally re-parsed as an array
# of UBInt16
TunnelAdapter(
PascalString("data", encoding = "zlib"),
GreedyRange(UBInt16("elements"))
)
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rX c @ s e Zd ZdZddgZdd� ZdS )� ExprAdaptera>
A generic adapter that accepts 'encoder' and 'decoder' as parameters. You
can use ExprAdapter instead of writing a full-blown class when only a
simple expression is needed.
Parameters:
* subcon - the subcon to adapt
* encoder - a function that takes (obj, context) and returns an encoded
version of obj
* decoder - a function that takes (obj, context) and returns a decoded
version of obj
Example:
ExprAdapter(UBInt8("foo"),
encoder = lambda obj, ctx: obj / 4,
decoder = lambda obj, ctx: obj * 4,
)
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S ) �HexDumpAdapterzT
Adapter for hex-dumping strings. It returns a HexString, which is a string
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� ConstAdaptera,
Adapter for enforcing a constant value ("magic numbers"). When decoding,
the return value is checked; when building, the value is substituted in.
Parameters:
* subcon - the subcon to validate
* value - the expected value
Example:
Const(Field("signature", 2), "MZ")
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dd�Zdd� Zdd � ZdS ) �SlicingAdapterz�
Adapter for slicing a list (getting a slice from that list)
Parameters:
* subcon - the subcon to slice
* start - start index
* stop - stop index (or None for up-to-end)
* step - step (or None for every element)
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�IndexingAdapterz�
Adapter for indexing a list (getting a single item from that list)
Parameters:
* subcon - the subcon to index
* index - the index of the list to get
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d � Zd S )�PaddingAdaptera+
Adapter for padding.
Parameters:
* subcon - the subcon to pad
* pattern - the padding pattern (character as byte). default is b"\x00"
* strict - whether or not to verify, during parsing, that the given
padding matches the padding pattern. default is False (unstrict)
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zPaddingAdapter._decodeN)rC Fr* r r r r ro y s
ro c @ s, e Zd ZdZg Zdd� Zdd� Zdd� ZdS ) � Validatorz�
Abstract class: validates a condition on the encoded/decoded object.
Override _validate(obj, context) in deriving classes.
Parameters:
* subcon - the subcon to validate
c C s | � ||�std|��|S )Nzinvalid object)� _validater r( r r r r) � s
zValidator._decodec C s | � ||�S r )r) r( r r r r' � s zValidator._encodec C s
t � �d S r )�NotImplementedErrorr( r r r rs � s zValidator._validateN)r r r r+ r r) r' rs r r r r rr � s
rr c @ s& e Zd ZdZdgZdd� Zdd� ZdS )�OneOfai
Validates that the object is one of the listed values.
:param ``Construct`` subcon: object to validate
:param iterable valids: a set of valid values
>>> OneOf(UBInt8("foo"), [4,5,6,7]).parse("\x05")
5
>>> OneOf(UBInt8("foo"), [4,5,6,7]).parse("\x08")
Traceback (most recent call last):
...
construct.core.ValidationError: ('invalid object', 8)
>>>
>>> OneOf(UBInt8("foo"), [4,5,6,7]).build(5)
'\x05'
>>> OneOf(UBInt8("foo"), [4,5,6,7]).build(9)
Traceback (most recent call last):
...
construct.core.ValidationError: ('invalid object', 9)
�validsc C s t �| |� || _d S r )rr r rv )r r! rv r r r r � s zOneOf.__init__c C s
|| j v S r )rv r( r r r rs � s zOneOf._validateN�r r r r+ r r rs r r r r ru � s ru c @ s& e Zd ZdZdgZdd� Zdd� ZdS )�NoneOfa�
Validates that the object is none of the listed values.
:param ``Construct`` subcon: object to validate
:param iterable invalids: a set of invalid values
>>> NoneOf(UBInt8("foo"), [4,5,6,7]).parse("\x08")
8
>>> NoneOf(UBInt8("foo"), [4,5,6,7]).parse("\x06")
Traceback (most recent call last):
...
construct.core.ValidationError: ('invalid object', 6)
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