Assign variable length value to a String within a Struct
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Patrick Olsen
Jan 27, 2016, 1:38:35 PM1/27/16
to Construct
I have the following struct
TEST_STRUCT = construct.Struct(
u'item_data_struct',
construct.ULInt32(u'string_length'),
construct.Bytes(u'unknown', 4),
construct.String(name, ?????)
)
Returns:
Container:
string_length = 12
unknown = '\x01\x01\x00\x00'
So the string is 12 bytes. I want to be able to assign this value to the next set of N bytes within my struct.
Basically I want it to be...
TEST_STRUCT = construct.Struct(
u'item_data_struct',
construct.ULInt32(u'string_length'),
construct.Bytes(u'unknown', 4),
construct.String(u'string', construct.ULInt32(u'string_length')) # Which in this example would be 12.
)
Patrick Olsen
Jan 27, 2016, 1:46:18 PM1/27/16
to Construct
Figured it out....
TEST_STRUCT = construct.Struct(
u'item_data_struct',
construct.ULInt32(u'string_length'),
construct.Bytes(u'unknown', 4),
construct.String('string_name', lambda ctx: ctx.string_length)
)
Arek Bulski
Sep 26, 2016, 10:35:23 AM9/26/16
to Construct
Bytes does not work with unicode strings. Perhaps it was supposed to be a Const with byes literal?
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