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Rewrite decode.py to always pick a valid codec #19

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Rewrite decode.py to always pick a valid codec #19

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3dbffe5
Rewrite `decode.py` fuzzer
StanFromIreland Mar 26, 2026
2fa45bf
drop old approach altogether
StanFromIreland Mar 26, 2026
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15 changes: 10 additions & 5 deletions decode.py
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Original file line number Diff line number Diff line change
@@ -1,10 +1,15 @@
from encodings.aliases import aliases

ALL_CODECS = sorted(set(aliases.values()))

def FuzzerRunOne(FuzzerInput):
l = int(len(FuzzerInput)/2)
A = FuzzerInput[:l]
B = FuzzerInput[l:].decode("utf-8", "replace").strip()
if len(FuzzerInput) < 2:
return
codec = ALL_CODECS[FuzzerInput[0] % len(ALL_CODECS)]
data = FuzzerInput[1:]
try:
A.decode(B)
data.decode(codec)
except SystemError:
raise
except:
except Exception:
pass
324 changes: 0 additions & 324 deletions fuzzer-decode.dict
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