Improve parsing in isar_bstool.py

    if x < len(CODECS):

        return CODECS[x]

    return "UNKNOWN"

    raise IsarBstoolError(f"Unknown codec value in ISAR file header: {x}")

def _codec_to_bytes(codec: str) -> bytes:

    # Refer to ISAR_SPLIT_REND_CODEC enum in C code

    CODECS = {"LCLD": 0, "LC3PLUS": 1, "DEFAULT": 2, "NONE": 3}

    return CODECS.get(codec, 255).to_bytes(4, byteorder="little")

    return CODECS[codec].to_bytes(4, byteorder="little")

def _pose_corr_from_bytes(bytes_: bytes) -> str:

    if x < len(POSE_CORR_MODES):

        return POSE_CORR_MODES[x]

    return "UNKNOWN"

    raise IsarBstoolError(f"Unknown pose correction value in ISAR file header: {x}")

def _pose_corr_to_bytes(pose_corr: str) -> bytes:

    # Refer to ISAR_SPLIT_REND_POSE_CORRECTION_MODE enum in C code

    POSE_CORR_MODES = {"NONE": 0, "CLDFB": 1}

    return POSE_CORR_MODES.get(pose_corr, 255).to_bytes(4, byteorder="little")

    return POSE_CORR_MODES[pose_corr].to_bytes(4, byteorder="little")

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