package com.amazonaws.samples.aesgcmsiv;

 /*
 * Copyright © 2017 Coda Hale (coda.hale@gmail.com)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

interface Bytes {

    static void putInt(int n, byte[] b) {
        b[0] = (byte) n;
        b[1] = (byte) (n >> 8);
        b[2] = (byte) (n >> 16);
        b[3] = (byte) (n >> 24);
    }

    static void putLong(long n, byte[] b, int offset) {
        final int hi = (int) (n & 0xffffffffL);
        final int lo = (int) (n >> 32);
        b[offset] = (byte) hi;
        b[++offset] = (byte) (hi >> 8);
        b[++offset] = (byte) (hi >> 16);
        b[++offset] = (byte) (hi >> 24);
        b[++offset] = (byte) lo;
        b[++offset] = (byte) (lo >> 8);
        b[++offset] = (byte) (lo >> 16);
        b[++offset] = (byte) (lo >> 24);
    }

    static int getInt(byte[] b, int offset) {
        int n = b[offset] & 0xff;
        n |= (b[++offset] & 0xff) << 8;
        n |= (b[++offset] & 0xff) << 16;
        n |= b[++offset] << 24;
        return n;
    }

    static long getLong(byte[] b, int offset) {
        int lo = b[offset] & 0xff;
        lo |= (b[++offset] & 0xff) << 8;
        lo |= (b[++offset] & 0xff) << 16;
        lo |= b[++offset] << 24;

        int hi = b[++offset] & 0xff;
        hi |= (b[++offset] & 0xff) << 8;
        hi |= (b[++offset] & 0xff) << 16;
        hi |= b[++offset] << 24;

        return ((hi & 0xffffffffL) << 32) | (lo & 0xffffffffL);
    }
}