aureooms/js-integer-little-endian

import { _build , _alloc , _reset , _copy } from '../array' ;
import { _div } from '../arithmetic' ;
import { _jz } from '../compare' ;

/**
 *
 * @param {Number} f the base to convert from
 * @param {Number} t the base to convert to
 * @param {Array} a the origin array
 * @param {Number} ai start offset in the origin array
 * @param {Number} aj end offset in the origin array
 * @param {Array} b the destination array
 * @param {Number} bi start offset in the destination array
 * @param {Number} bj end offset in the destination array
 */

export function _convert_slow ( f , t , a , ai , aj , b , bi , bj ) {

    const d = _build( f , t ) ;
    const di = 0 ;
    const dj = d.length ;
    const qi = 0 ;
    const qj = aj - ai ;
    const q = _alloc( qj - qi ) ;

    while ( true ) {

        _reset( q , qi , qj ) ;

        _div( f , a , ai , aj , d , di , dj , q , qi ) ;

        --bj ;
        let x = 0 ;

        for ( let k = ai ; k < aj ; ++k ) {
            x *= f ;
            x += a[k] ;
        }

        b[bj] = x ;

        if ( _jz( q , qi , qj ) ) return ;

        _copy( q , qi , qj , a , ai ) ;

    }

}