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- added capability to compile Checksum #1095

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40 changes: 40 additions & 0 deletions construct/core.py
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Original file line number Diff line number Diff line change
Expand Up @@ -5578,6 +5578,46 @@ def _build(self, obj, stream, context, path):
def _sizeof(self, context, path):
return self.checksumfield._sizeof(context, path)

def _emitparse(self, code):
fname = f"parse_select_{code.allocateId()}"

block = f"""
def {fname}(io, this):
fallback = io.tell()
"""
for sc in self.subcons:
cb = sc._compileparse(code)
if cb == "None":
block += """
return None
"""
else:
block += f"""
try:
return {cb}
except ExplicitError:
raise
except Exception:
io.seek(fallback)
"""
code.append(block)
return "%s(io, this)" % (fname,)

def _emitbuild(self, code):
fname = f"build_select_{code.allocateId()}"

block = f"""
def {fname}(obj, io, this):
"""
for sc in self.subcons:
block += f"""
try:
return {sc._compilebuild(code)}
except:
pass
"""
code.append(block)
return "%s(obj, io, this)" % (fname,)

class Compressed(Tunnel):
r"""
Expand Down