def METHOD_NAME(files):
    """
    Generates packages names from name, data lists.
    :param files: list of (name, data)
    :return: packagenames mapt to data lists (eg. urls)
    """
    packs = {}
    endings = "\\.(3gp|7zip|7z|abr|ac3|aiff|aifc|aif|ai|au|avi|bin|bz2|cbr|cbz|ccf|cue|cvd|chm|dta|deb|divx|djvu|dlc|dmg|doc|docx|dot|eps|exe|ff|flv|f4v|gsd|gif|gz|iwd|iso|ipsw|java|jar|jpg|jpeg|jdeatme|load|mws|mw|m4v|m4a|mkv|mp2|mp3|mp4|mov|movie|mpeg|mpe|mpg|msi|msu|msp|nfo|npk|oga|ogg|ogv|otrkey|pkg|png|pdf|pptx|ppt|pps|ppz|pot|psd|qt|rmvb|rm|rar|ram|ra|rev|rnd|r\\d+|rpm|run|rsdf|rtf|sh(!?tml)|srt|snd|sfv|swf|tar|tif|tiff|ts|txt|viv|vivo|vob|wav|wmv|xla|xls|xpi|zeno|zip|z\\d+|_[_a-z]{2}|\\d+$)"
    rar_pats = [
        re.compile("(.*)(\\.|_|-)pa?r?t?\\.?[0-9]+.(rar|exe)$", re.I),
        re.compile("(.*)(\\.|_|-)part\\.?[0]*[1].(rar|exe)$", re.I),
        re.compile("(.*)\\.rar$", re.I),
        re.compile("(.*)\\.r\\d+$", re.I),
        re.compile("(.*)(\\.|_|-)\\d+$", re.I),
    ]
    zip_pats = [
        re.compile("(.*)\\.zip$", re.I),
        re.compile("(.*)\\.z\\d+$", re.I),
        re.compile("(?is).*\\.7z\\.[\\d]+$", re.I),
        re.compile("(.*)\\.a.$", re.I),
    ]
    ffsj_pats = [
        re.compile("(.*)\\._((_[a-z])|([a-z]{2}))(\\.|$)"),
        re.compile("(.*)(\\.|_|-)[\\d]+(" + endings + "$)", re.I),
    ]
    isz_pats = [re.compile("(.*)\\.isz$", re.I), re.compile("(.*)\\.i\\d{2}$", re.I)]
    pat1 = re.compile("(\\.?CD\\d+)", re.I)
    pat2 = re.compile("(\\.?part\\d+)", re.I)
    pat3 = re.compile("(.+)[\\.\\-_]+$")
    pat4 = re.compile("(.+)\\.\\d+\\.xtm$")
    for file, url in files:
        pattern_match = False
        if file is None:
            continue
        # remove trailing /
        name = file.rstrip("/")
        # extract last path part .. if there is a path
        split = name.rsplit("/", 1)
        if len(split) > 1:
            name = split.pop(1)
            # check if a already existing package may be ok for this file
        #        found = False
        #        for pack in packs:
        #            if pack in file:
        #                packs[pack].append(url)
        #                found = True
        #                break
        #
        #        if found: continue
        # unrar pattern, 7zip/zip and hjmerge pattern, isz pattern, FFSJ pattern
        before = name
        name = match_first(name, rar_pats, zip_pats, isz_pats, ffsj_pats)
        if before != name:
            pattern_match = True
        # xtremsplit pattern
        r = pat4.search(name)
        if r is not None:
            name = r.group(1)
        # remove part and cd pattern
        r = pat1.search(name)
        if r is not None:
            name = name.replace(r.group(0), "")
            pattern_match = True
        r = pat2.search(name)
        if r is not None:
            name = name.replace(r.group(0), "")
            pattern_match = True
        # additional checks if extension pattern matched
        if pattern_match:
            # remove extension
            index = name.rfind(".")
            if index <= 0:
                index = name.rfind("_")
            if index > 0:
                length = len(name) - index
                if length <= 4:
                    name = name[:-length]
            # remove endings like . _ -
            r = pat3.search(name)
            if r is not None:
                name = r.group(1)
            # replace . and _ with space
            name = name.replace(".", " ")
            name = name.replace("_", " ")
            name = name.strip()
        else:
            name = ""
        # fallback: package by hoster
        if not name:
            name = urlparse(file).hostname
            if name:
                name = name.replace("www.", "")
        # fallback : default name
        if not name:
            name = "unknown"
        # build mapping
        if name in packs:
            packs[name].append(url)
        else:
            packs[name] = [url]
    return packs