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compile Transformed #1094

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b369ede
compile Transformed
franzhaas Oct 4, 2024
1d0a7cc
- reduced repetition
franzhaas Oct 4, 2024
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37 changes: 37 additions & 0 deletions construct/core.py
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Original file line number Diff line number Diff line change
Expand Up @@ -5245,6 +5245,10 @@ class Transformed(Subconstruct):
>>> d.parse(b"\x00\x00")
b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
"""
converters = {bytes2bits: "bytes2bits",
bits2bytes: "bits2bytes",
swapbytes: "swapbytes",
swapbitsinbytes: "swapbitsinbytes"}

def __init__(self, subcon, decodefunc, decodeamount, encodefunc, encodeamount):
super().__init__(subcon)
Expand All @@ -5261,6 +5265,24 @@ def _parse(self, stream, context, path):
data = self.decodefunc(data)
return self.subcon._parsereport(io.BytesIO(data), context, path)

def _emitparse(self, code):
decodeamount = ""
if isinstance(self.decodeamount, int):
decodeamount = int(self.decodeamount)

aid = code.allocateId()
decFunc = self.converters[self.decodefunc]

code.append(f"""
from construct.lib.binary import bytes2bits, bits2bytes
from io import BytesIO
def Transforming_{aid}(ioOrig, this):
data = ioOrig.read({decodeamount})
io = BytesIO({decFunc}(data))
return {self.subcon._emitparse(code)}
""")
return f"Transforming_{aid}(io, this)"

def _build(self, obj, stream, context, path):
stream2 = io.BytesIO()
buildret = self.subcon._build(obj, stream2, context, path)
Expand All @@ -5272,6 +5294,21 @@ def _build(self, obj, stream, context, path):
stream_write(stream, data, len(data), path)
return buildret

def _emitbuild(self, code):
aid = code.allocateId()
encFunc = self.converters[self.encodefunc]

code.append(f"""
from construct.lib.binary import bytes2bits, bits2bytes
from io import BytesIO
def TransformingBuild_{aid}(obj, this, io_):
io = BytesIO()
{self.subcon._emitbuild(code)}
io_.write({encFunc}(io.getvalue()))
return obj
""")
return f"TransformingBuild_{aid}(obj, this, io)"

def _sizeof(self, context, path):
if self.decodeamount is None or self.encodeamount is None:
raise SizeofError(path=path)
Expand Down