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| package cc.mrbird.febs.pay.util;
|
| import java.io.ByteArrayOutputStream;
|
| /**
| * base64 format encoding & decoding
| */
| public class Base64Util {
| private static char[] base64EncodeChars = new char[] { 'A', 'B', 'C', 'D',
| 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q',
| 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd',
| 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q',
| 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3',
| '4', '5', '6', '7', '8', '9', '+', '/' };
|
| private static byte[] base64DecodeChars = new byte[] { -1, -1, -1, -1, -1,
| -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
| -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
| -1, -1, -1, -1, 62, -1, -1, -1, 63, 52, 53, 54, 55, 56, 57, 58, 59,
| 60, 61, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
| 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1,
| -1, -1, -1, -1, -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37,
| 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1,
| -1, -1 };
|
| private Base64Util(){
| }
|
| public static String encode(byte[] data){
| StringBuffer sb = new StringBuffer();
| int len = data.length;
| int i = 0;
| int b1, b2, b3;
|
| while (i < len) {
| b1 = data[i++] & 0xff;
| if (i == len) {
| sb.append(base64EncodeChars[b1 >>> 2]);
| sb.append(base64EncodeChars[(b1 & 0x3) << 4]);
| sb.append("==");
| break;
| }
| b2 = data[i++] & 0xff;
| if (i == len) {
| sb.append(base64EncodeChars[b1 >>> 2]);
| sb.append(base64EncodeChars[((b1 & 0x03) << 4)
| | ((b2 & 0xf0) >>> 4)]);
| sb.append(base64EncodeChars[(b2 & 0x0f) << 2]);
| sb.append("=");
| break;
| }
| b3 = data[i++] & 0xff;
| sb.append(base64EncodeChars[b1 >>> 2]);
| sb.append(base64EncodeChars[((b1 & 0x03) << 4)
| | ((b2 & 0xf0) >>> 4)]);
| sb.append(base64EncodeChars[((b2 & 0x0f) << 2)
| | ((b3 & 0xc0) >>> 6)]);
| sb.append(base64EncodeChars[b3 & 0x3f]);
| }
| return sb.toString();
| }
|
| public static byte[] decode(String str){
| byte[] data = str.getBytes();
| int len = data.length;
| ByteArrayOutputStream buf = new ByteArrayOutputStream(len);
| int i = 0;
| int b1, b2, b3, b4;
|
| while (i < len) {
|
| /* b1 */
| do {
| b1 = base64DecodeChars[data[i++]];
| } while (i < len && b1 == -1);
| if (b1 == -1) {
| break;
| }
|
| /* b2 */
| do {
| b2 = base64DecodeChars[data[i++]];
| } while (i < len && b2 == -1);
| if (b2 == -1) {
| break;
| }
| buf.write(((b1 << 2) | ((b2 & 0x30) >>> 4)));
|
| /* b3 */
| do {
| b3 = data[i++];
| if (b3 == 61) {
| return buf.toByteArray();
| }
| b3 = base64DecodeChars[b3];
| } while (i < len && b3 == -1);
| if (b3 == -1) {
| break;
| }
| buf.write((((b2 & 0x0f) << 4) | ((b3 & 0x3c) >>> 2)));
|
| /* b4 */
| do {
| b4 = data[i++];
| if (b4 == 61) {
| return buf.toByteArray();
| }
| b4 = base64DecodeChars[b4];
| } while (i < len && b4 == -1);
| if (b4 == -1) {
| break;
| }
| buf.write((((b3 & 0x03) << 6) | b4));
| }
| return buf.toByteArray();
| }
|
| }
|
|
