mirror of
https://github.com/eronnen/procmon-parser
synced 2026-06-08 14:05:59 +00:00
eronnen
91 lines
3.2 KiB
Python
91 lines
3.2 KiB
Python
from construct import Enum, Adapter, IfThenElse, PaddedString, CString, GreedyString, FixedSized, GreedyRange, Bytes, \
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GreedyBytes, If, Check, CheckError
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from six import text_type, string_types
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# ===============================================================================
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# Classes for construct
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# ===============================================================================
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class OriginalEnumAdapter(Enum):
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"""Used to decode the original enum type instead of EnumIntegerString
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"""
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def __init__(self, subcon, enum_class, *arg, **kwargs):
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super(OriginalEnumAdapter, self).__init__(subcon, enum_class, *arg, **kwargs)
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self.original_enum = enum_class
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def _decode(self, obj, context, path):
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return self.original_enum[super(OriginalEnumAdapter, self)._decode(obj, context, path)]
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class ListAdapter(Adapter):
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"""Used to decode regular python list instead of ListContainer
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"""
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def _decode(self, obj, context, path):
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return list(obj)
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def _encode(self, obj, context, path):
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return obj
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class UnicodeStringAdapter(Adapter):
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def _decode(self, obj, context, path):
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return obj
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def _encode(self, obj, context, path):
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if not isinstance(obj, string_types):
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raise TypeError("Expected string, got {}".format(type(obj)))
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return text_type(obj)
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def FixedUTF16String(size_func):
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"""At parse time parses a UTF16 string with a known size, and at build time builds the string with its given size.
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"""
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return UnicodeStringAdapter(
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IfThenElse(lambda ctx: ctx._parsing, PaddedString(size_func, "UTF_16_le"), GreedyString("UTF_16_le"))
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)
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def FixedUTF16CString(size_func, ctx_str_name):
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"""At parse time parses a UTF16 string terminated with null byte with a known size, and at build time builds
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the string with its given size.
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If the given string is empty at build time, then build nothing instead of a single null character.
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"""
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return UnicodeStringAdapter(
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IfThenElse(lambda ctx: ctx._parsing, PaddedString(size_func, "UTF_16_le"),
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If(lambda ctx: ctx[ctx_str_name], CString("UTF_16_le")))
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)
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def FixedArray(size_func, subcon):
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"""At parse time parses a fixed sized array, and at build time builds the array with its given size.
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"""
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return ListAdapter(
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IfThenElse(lambda this: this._parsing, FixedSized(size_func, GreedyRange(subcon)), GreedyRange(subcon)))
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def FixedBytes(size_func):
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"""At parse time parses a fixed sized byte array, and at build time builds the byte array with its given size.
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"""
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return IfThenElse(lambda this: this._parsing, Bytes(size_func), GreedyBytes)
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class CheckCustom(Check):
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def __init__(self, func, exc_type, msg):
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super(CheckCustom, self).__init__(func)
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self.exc_type = exc_type
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self.msg = msg
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def _build(self, obj, stream, context, path):
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try:
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super(CheckCustom, self)._build(obj, stream, context, path)
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except CheckError:
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raise self.exc_type(self.msg)
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def _parse(self, stream, context, path):
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try:
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super(CheckCustom, self)._parse(stream, context, path)
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except CheckError:
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raise self.exc_type(self.msg)
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