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@ -1,5 +1,10 @@
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#!/usr/bin/env python3
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#!/usr/bin/env python3
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#
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# Author......: See docs/credits.txt
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# License.....: MIT
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#
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from argparse import ArgumentParser, ArgumentTypeError
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from argparse import ArgumentParser, ArgumentTypeError
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@ -23,9 +28,10 @@ def validate_offset(offset):
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offset = BOOTABLE_OFFSET + HIDDEN_OFFSET
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offset = BOOTABLE_OFFSET + HIDDEN_OFFSET
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try:
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try:
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offset = int(offset)
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offset = int(offset)
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assert offset >= 0
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except ValueError as e:
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except (AssertionError, ValueError):
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raise ArgumentTypeError("value is nether number nor allowed string") from e
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raise ArgumentTypeError("offset is nether non-negative number nor bootable, hidden or bootable+hidden value")
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if offset < 0:
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raise ArgumentTypeError("value cannot be less than zero")
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return offset
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return offset
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@ -42,14 +48,18 @@ if __name__ == "__main__":
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args = parser.parse_args()
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args = parser.parse_args()
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with open(args.path, "rb") as file:
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try:
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file.seek(args.offset)
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with open(args.path, "rb") as file:
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file.seek(args.offset)
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header = file.read(HEADER_LENGTH)
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header = file.read(HEADER_LENGTH)
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assert len(header) == HEADER_LENGTH, "less data than needed"
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if len(header) < HEADER_LENGTH:
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parser.error("file contains less data than needed")
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salt, data = header[:SALT_LENGTH], header[SALT_LENGTH:]
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salt, data = header[:SALT_LENGTH], header[SALT_LENGTH:]
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hash = SIGNATURE + salt.hex() + "$" + data.hex()
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hash = SIGNATURE + salt.hex() + "$" + data.hex()
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print(hash)
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print(hash)
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except IOError as e:
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parser.error(e.strerror.lower())
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