58 lines
1.4 KiB
Python
58 lines
1.4 KiB
Python
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from nullptr.store import CHUNK_MAGIC, ChunkHeader, StoreUnpickler
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from hexdump import hexdump
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from io import BytesIO
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class FakeStore:
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def get(self, typ, sym, create=False):
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return None
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class StoreAnalyzer:
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def __init__(self, verbose=False):
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self.verbose = verbose
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def load_obj(self, f, sz):
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buf = BytesIO(f.read(sz))
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p = StoreUnpickler(buf, FakeStore())
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obj = p.load()
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return obj
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print(obj.symbol, type(obj).__name__)
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def run(self, f):
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lastpos = 0
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pos = 0
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objs = {}
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result = True
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f.seek(0)
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while True:
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lastpos = pos
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pos = f.tell()
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m = f.read(8)
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if len(m) < 8:
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break
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if m != CHUNK_MAGIC:
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print(f'missing magic at {pos}')
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result = False
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self.investigate(f, lastpos)
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break
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f.seek(-8, 1)
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h = ChunkHeader.parse(f)
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if self.verbose:
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print(h, pos)
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if h.in_use:
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obj = self.load_obj(f, h.used)
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kobj = obj.symbol, type(obj).__name__
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if kobj in objs:
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print(f'Double object {kobj} prev {objs[kobj]} latest {h}')
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result = False
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objs[kobj] = h
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else:
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f.seek(h.used, 1)
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f.seek(h.size - h.used, 1)
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return result
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def investigate(self, f, lastpos):
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print(f'dumping 1024 bytes from {lastpos}')
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f.seek(lastpos, 0)
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d = f.read(1024)
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hexdump(d)
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print(d.index(CHUNK_MAGIC))
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