Break The Syntax

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import sys

# Basic HID keycode -> (unshifted, shifted) map for a US keyboard
HID_KEYCODE = {
    4: ("a", "A"),
    5: ("b", "B"),
    6: ("c", "C"),
    7: ("d", "D"),
    8: ("e", "E"),
    9: ("f", "F"),
    10: ("g", "G"),
    11: ("h", "H"),
    12: ("i", "I"),
    13: ("j", "J"),
    14: ("k", "K"),
    15: ("l", "L"),
    16: ("m", "M"),
    17: ("n", "N"),
    18: ("o", "O"),
    19: ("p", "P"),
    20: ("q", "Q"),
    21: ("r", "R"),
    22: ("s", "S"),
    23: ("t", "T"),
    24: ("u", "U"),
    25: ("v", "V"),
    26: ("w", "W"),
    27: ("x", "X"),
    28: ("y", "Y"),
    29: ("z", "Z"),
    30: ("1", "!"),
    31: ("2", "@"),
    32: ("3", "#"),
    33: ("4", "$"),
    34: ("5", "%"),
    35: ("6", "^"),
    36: ("7", "&"),
    37: ("8", "*"),
    38: ("9", "("),
    39: ("0", ")"),
    40: ("\n", "\n"),
    44: (" ", " "),
    45: ("-", "_"),
    46: ("=", "+"),
    47: ("[", "{"),
    48: ("]", "}"),
    49: ("\\", "|"),
    51: (";", ":"),
    52: ("'", '"'),
    53: ("`", "~"),
    54: (",", "<"),
    55: (".", ">"),
    56: ("/", "?"),
    0: ("", ""),  # no key
}

BACKSPACE = 0x2A
DELETE = 0x4C


def decode_line(hex_str):
    # Convert hex string to bytes
    b = bytes.fromhex(hex_str.strip())
    # If there's a report-ID byte (9-byte report), drop it:
    if len(b) > 8:
        b = b[1:]
    if len(b) < 8:
        return ""
    modifier = b[0]
    # USB HID reserves byte1, and bytes[2:8] are up to 6 keycodes
    keycodes = b[2:]
    out = []
    for kc in keycodes:
        if kc == 0:
            continue
        # Backspace/Delete
        if kc == BACKSPACE or kc == DELETE:
            out.append("\b")
            continue
        unsh, sh = HID_KEYCODE.get(kc, ("", ""))
        # shift mask: left=0x02, right=0x20
        if modifier & (0x02 | 0x20):
            out.append(sh or unsh.upper())
        else:
            out.append(unsh)
    return "".join(out)


def main():
    if len(sys.argv) != 2:
        print(f"Usage: {sys.argv[0]} <raw_hid_file>", file=sys.stderr)
        sys.exit(1)

    buf = []
    for line in open(sys.argv[1]):
        decoded = decode_line(line)
        for ch in decoded:
            if ch == "\b" and buf:
                buf.pop()
            else:
                buf.append(ch)
    print("".join(buf), end="")


if __name__ == "__main__":
    main()

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