50 lines
1.3 KiB
Python
50 lines
1.3 KiB
Python
import sys, struct
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def read_e2store(name):
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with open(name, "rb") as f:
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header = f.read(8)
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typ = header[0:2] # First 2 bytes for type
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if typ != b"e2":
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raise RuntimeError("this is not an e2store file")
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while True:
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header = f.read(8) # Header is 8 bytes
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if not header: break
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typ = header[0:2] # First 2 bytes for type
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dlen = struct.unpack("<q", header[2:8] + b"\0\0")[0] # 6 bytes of little-endian length
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data = f.read(dlen)
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if len(data) != dlen: # Don't trust the given length, specially when pre-allocating
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raise RuntimeError("File is missing data")
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if typ == b"i2":
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raise RuntimeError("Cannot switch to index mode")
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elif typ == b"e2":
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pass # Ignore extra headers
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yield (typ, data)
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def find_offset(name, slot):
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# Find the offset of a given slot
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with open(name, "rb") as f:
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header = f.read(8)
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typ = header[0:2] # First 2 bytes for type
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if typ != b"i2":
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raise RuntimeError("this is not an e2store file")
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start_slot = struct.unpack("<q", f.read(8))[0]
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f.seek(8 * (slot - start_slot) + 16)
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return struct.unpack("<q", f.read(8))[0]
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name = sys.argv[1]
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if name.endswith(".e2i"):
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print(find_offset(name, int(sys.argv[2])))
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else:
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for typ, data in read_e2store(name):
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print("typ", typ, "data", len(data))
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