_tifffile.py 文件源码

def read_cz_lsm_info(fh, byteorder, dtype, count):
    """Read CS_LSM_INFO tag from file and return as numpy.rec.array."""
    assert byteorder == '<'
    magic_number, structure_size = struct.unpack('<II', fh.read(8))
    if magic_number not in (50350412, 67127628):
        raise ValueError("not a valid CS_LSM_INFO structure")
    fh.seek(-8, 1)

    if structure_size < numpy.dtype(CZ_LSM_INFO).itemsize:
        # adjust structure according to structure_size
        cz_lsm_info = []
        size = 0
        for name, dtype in CZ_LSM_INFO:
            size += numpy.dtype(dtype).itemsize
            if size > structure_size:
                break
            cz_lsm_info.append((name, dtype))
    else:
        cz_lsm_info = CZ_LSM_INFO

    return fh.read_record(cz_lsm_info, byteorder=byteorder)