package com.mbridge.msdk.foundation.tools;

import java.nio.charset.StandardCharsets;
import java.util.Arrays;

/* loaded from: classes4.dex */
public final class y {
    public static final char[] a;
    public static final int[] b;

    static {
        char[] charArray = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".toCharArray();
        a = charArray;
        int[] iArr = new int[256];
        b = iArr;
        Arrays.fill(iArr, -1);
        int length = charArray.length;
        for (int i = 0; i < length; i++) {
            b[a[i]] = i;
        }
        b[61] = 0;
    }

    public static String a(String str) {
        int i;
        byte[] bArr;
        int length = str.length();
        if (length == 0) {
            bArr = new byte[0];
        } else {
            int i2 = length - 1;
            int i3 = 0;
            while (i3 < i2 && b[str.charAt(i3) & 255] < 0) {
                i3++;
            }
            while (i2 > 0 && b[str.charAt(i2) & 255] < 0) {
                i2--;
            }
            int i4 = str.charAt(i2) == '=' ? str.charAt(i2 + (-1)) == '=' ? 2 : 1 : 0;
            int i5 = (i2 - i3) + 1;
            if (length > 76) {
                i = (str.charAt(76) == '\r' ? i5 / 78 : 0) << 1;
            } else {
                i = 0;
            }
            int i6 = (((i5 - i) * 6) >> 3) - i4;
            byte[] bArr2 = new byte[i6];
            int i7 = (i6 / 3) * 3;
            int i8 = 0;
            int i9 = 0;
            while (i8 < i7) {
                int[] iArr = b;
                int i10 = i3 + 4;
                int i11 = iArr[str.charAt(i3 + 3)] | (iArr[str.charAt(i3 + 1)] << 12) | (iArr[str.charAt(i3)] << 18) | (iArr[str.charAt(i3 + 2)] << 6);
                bArr2[i8] = (byte) (i11 >> 16);
                int i12 = i8 + 2;
                bArr2[i8 + 1] = (byte) (i11 >> 8);
                i8 += 3;
                bArr2[i12] = (byte) i11;
                if (i <= 0 || (i9 = i9 + 1) != 19) {
                    i3 = i10;
                } else {
                    i3 += 6;
                    i9 = 0;
                }
            }
            if (i8 < i6) {
                int i13 = 0;
                int i14 = 0;
                while (i3 <= i2 - i4) {
                    i13 |= b[str.charAt(i3)] << (18 - (i14 * 6));
                    i14++;
                    i3++;
                }
                int i15 = 16;
                while (i8 < i6) {
                    bArr2[i8] = (byte) (i13 >> i15);
                    i15 -= 8;
                    i8++;
                }
            }
            bArr = bArr2;
        }
        return bArr.length == 0 ? "" : new String(bArr, StandardCharsets.UTF_8);
    }
}