"""Interpret sun audio headers.""" MAGIC = '.snd' class error(Exception):    pass  def get_long_be(s):    """Convert a 4-char value to integer."""    return (ord(s[0])<<24) | (ord(s[1])<<16) | (ord(s[2])<<8) | ord(s[3])  def gethdr(fp):    """Read a sound header from an open file."""    if fp.read(4) != MAGIC:        raise error, 'gethdr: bad magic word'    hdr_size = get_long_be(fp.read(4))    data_size = get_long_be(fp.read(4))    encoding = get_long_be(fp.read(4))    sample_rate = get_long_be(fp.read(4))    channels = get_long_be(fp.read(4))    excess = hdr_size - 24    if excess < 0:        raise error, 'gethdr: bad hdr_size'    if excess > 0:        info = fp.read(excess)    else:        info = ''    return (data_size, encoding, sample_rate, channels, info)  def printhdr(file):    """Read and print the sound header of a named file."""    hdr = gethdr(open(file, 'r'))    data_size, encoding, sample_rate, channels, info = hdr    while info[-1:] == '\0':        info = info[:-1]    print 'File name:  ', file    print 'Data size:  ', data_size    print 'Encoding:   ', encoding    print 'Sample rate:', sample_rate    print 'Channels:   ', channels    print 'Info:       ', repr(info)