39 lines
1.2 KiB
Python
39 lines
1.2 KiB
Python
#!/usr/bin/env python3
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import zipfile
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import struct
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def readPayloadMetadata(zfp: zipfile.ZipFile, entry):
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_MAGIC = b'CrAU'
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# 8 bytes for version, 8 bytes for manifest length, 4 bytes for metadata signature length
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HEADER_STRUCT = ">4sQQL"
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HEADER_LEN = struct.calcsize(HEADER_STRUCT)
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with zfp.open(entry) as fp:
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header = fp.read(HEADER_LEN)
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(magic, version, manifest_length,
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metadata_signature_len) = struct.unpack(HEADER_STRUCT, header)
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assert magic == _MAGIC
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assert version == 2, "Unsupported major payload version " + str(version)
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print(f"{manifest_length} {metadata_signature_len}")
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return header + fp.read(manifest_length + metadata_signature_len)
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def main(argv):
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if len(argv) != 3:
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print("Usage:", argv[0], "<input file> <output file>")
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return 1
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infile = argv[1]
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outfile = argv[2]
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with zipfile.ZipFile(infile, "r") as inzfp, zipfile.ZipFile(outfile, "w") as outzfp:
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for entry in inzfp.infolist():
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if entry.filename.startswith("META") or entry.filename.endswith(".map"):
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outzfp.writestr(entry, inzfp.read(entry))
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elif entry.filename == "payload.bin":
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outzfp.writestr(entry, readPayloadMetadata(inzfp, entry))
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if __name__ == '__main__':
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import sys
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sys.exit(main(sys.argv))
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