def METHOD_NAME(fp):
    """Read a chunk -- data for one file, ending with sep1.
    Split the chunk in parts separated by sep2.
    """
    chunk = []
    lines = []
    while 1:
        line = fp.readline()
        if not line:
            break
        if line == sep1:
            if lines:
                chunk.append(lines)
            break
        if line == sep2:
            if lines:
                chunk.append(lines)
                lines = []
        else:
            lines.append(line)
    return chunk