Obtains information on CHM archive.
        This function checks the /#SYSTEM file inside the CHM archive to
        obtain the index, home page, topics, encoding and title. It is called
        from LoadCHM.

def GetArchiveInfo(self):
        '''Obtains information on CHM archive.
        This function checks the /#SYSTEM file inside the CHM archive to
        obtain the index, home page, topics, encoding and title. It is called
        from LoadCHM.
        '''

        self.searchable = extra.is_searchable(self.file)
        self.lcid = None

        result, ui = chmlib.chm_resolve_object(self.file, '/#SYSTEM')
        if (result != chmlib.CHM_RESOLVE_SUCCESS):
            sys.stderr.write('GetArchiveInfo: #SYSTEM does not exist\n')
            return 0

        size, text = chmlib.chm_retrieve_object(self.file, ui, 4l, ui.length)
        if (size == 0):
            sys.stderr.write('GetArchiveInfo: file size = 0\n')
            return 0

        buff = array.array('B', text)

        index = 0
        while (index < size):
            cursor = buff[index] + (buff[index+1] * 256)

            if (cursor == 0):
                index += 2
                cursor = buff[index] + (buff[index+1] * 256)
                index += 2
                self.topics = '/' + text[index:index+cursor-1]
            elif (cursor == 1):
                index += 2
                cursor = buff[index] + (buff[index+1] * 256)
                index += 2
                self.index = '/' + text[index:index+cursor-1]
            elif (cursor == 2):
                index += 2
                cursor = buff[index] + (buff[index+1] * 256)
                index += 2
                self.home = '/' + text[index:index+cursor-1]
            elif (cursor == 3):
                index += 2
                cursor = buff[index] + (buff[index+1] * 256)
                index += 2
                self.title = text[index:index+cursor-1]
            elif (cursor == 4):
                index += 2
                cursor = buff[index] + (buff[index+1] * 256)
                index += 2
                self.lcid = buff[index] + (buff[index+1] * 256)
            elif (cursor == 6):
                index += 2
                cursor = buff[index] + (buff[index+1] * 256)
                index += 2
                tmp = text[index:index+cursor-1]
                if not self.topics:
                    tmp1 = '/' + tmp + '.hhc'
                    tmp2 = '/' + tmp + '.hhk'
                    res1, ui1 = chmlib.chm_resolve_object(self.file, tmp1)
                    res2, ui2 = chmlib.chm_resolve_object(self.file, tmp2)
                    if not self.topics and res1 == chmlib.CHM_RESOLVE_SUCCESS:
                        self.topics = '/' + tmp + '.hhc'
                    if not self.index and res2 == chmlib.CHM_RESOLVE_SUCCESS:
                        self.index = '/' + tmp + '.hhk'
            elif (cursor == 16):
                index += 2
                cursor = buff[index] + (buff[index+1] * 256)
                index += 2
                self.encoding = text[index:index+cursor-1]
            else:
                index += 2
                cursor = buff[index] + (buff[index+1] * 256)
                index += 2
            index += cursor

        self.GetWindowsInfo()

        if not self.lcid:
            self.lcid = extra.get_lcid(self.file)

        return 1