|
@@ -0,0 +1,358 @@
|
|
|
+package com.example.industrycode.util;
|
|
|
+
|
|
|
+import java.util.regex.Matcher;
|
|
|
+import java.util.regex.Pattern;
|
|
|
+
|
|
|
+public class Base64Util {
|
|
|
+
|
|
|
+ private static final int BASELENGTH = 128;
|
|
|
+ private static final int LOOKUPLENGTH = 64;
|
|
|
+ private static final int TWENTYFOURBITGROUP = 24;
|
|
|
+ private static final int EIGHTBIT = 8;
|
|
|
+ private static final int SIXTEENBIT = 16;
|
|
|
+ private static final int FOURBYTE = 4;
|
|
|
+ private static final int SIGN = -128;
|
|
|
+ private static final char PAD = '=';
|
|
|
+ private static final boolean fDebug = false;
|
|
|
+ private static final byte[] base64Alphabet = new byte[BASELENGTH];
|
|
|
+ private static final char[] lookUpBase64Alphabet = new char[LOOKUPLENGTH];
|
|
|
+
|
|
|
+ static {
|
|
|
+ for (int i = 0; i < BASELENGTH; ++i) {
|
|
|
+ base64Alphabet[i] = -1;
|
|
|
+ }
|
|
|
+ for (int i = 'Z'; i >= 'A'; i--) {
|
|
|
+ base64Alphabet[i] = (byte) (i - 'A');
|
|
|
+ }
|
|
|
+ for (int i = 'z'; i >= 'a'; i--) {
|
|
|
+ base64Alphabet[i] = (byte) (i - 'a' + 26);
|
|
|
+ }
|
|
|
+ for (int i = '9'; i >= '0'; i--) {
|
|
|
+ base64Alphabet[i] = (byte) (i - '0' + 52);
|
|
|
+ }
|
|
|
+ base64Alphabet['+'] = 62;
|
|
|
+ base64Alphabet['/'] = 63;
|
|
|
+ for (int i = 0; i <= 25; i++) {
|
|
|
+ lookUpBase64Alphabet[i] = (char) ('A' + i);
|
|
|
+ }
|
|
|
+ for (int i = 26, j = 0; i <= 51; i++, j++) {
|
|
|
+ lookUpBase64Alphabet[i] = (char) ('a' + j);
|
|
|
+ }
|
|
|
+ for (int i = 52, j = 0; i <= 61; i++, j++) {
|
|
|
+ lookUpBase64Alphabet[i] = (char) ('0' + j);
|
|
|
+ }
|
|
|
+ lookUpBase64Alphabet[62] = (char) '+';
|
|
|
+ lookUpBase64Alphabet[63] = (char) '/';
|
|
|
+
|
|
|
+ }
|
|
|
+
|
|
|
+ private static boolean isWhiteSpace(char octect) {
|
|
|
+ return (octect == 0x20 || octect == 0xd || octect == 0xa || octect == 0x9);
|
|
|
+ }
|
|
|
+
|
|
|
+ private static boolean isPad(char octect) {
|
|
|
+ return (octect == PAD);
|
|
|
+ }
|
|
|
+
|
|
|
+ private static boolean isData(char octect) {
|
|
|
+ return (octect < BASELENGTH && base64Alphabet[octect] != -1);
|
|
|
+ }
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Encodes hex octects into Base64
|
|
|
+ *
|
|
|
+ * @param binaryData Array containing binaryData
|
|
|
+ * @return Encoded Base64 array
|
|
|
+ */
|
|
|
+ public static String encode(byte[] binaryData) {
|
|
|
+ if (binaryData == null) {
|
|
|
+ return null;
|
|
|
+ }
|
|
|
+ int lengthDataBits = binaryData.length * EIGHTBIT;
|
|
|
+ if (lengthDataBits == 0) {
|
|
|
+ return "";
|
|
|
+ }
|
|
|
+ int fewerThan24bits = lengthDataBits % TWENTYFOURBITGROUP;
|
|
|
+ int numberTriplets = lengthDataBits / TWENTYFOURBITGROUP;
|
|
|
+ int numberQuartet = fewerThan24bits != 0 ? numberTriplets + 1 : numberTriplets;
|
|
|
+ char encodedData[] = null;
|
|
|
+ encodedData = new char[numberQuartet * 4];
|
|
|
+ byte k = 0, l = 0, b1 = 0, b2 = 0, b3 = 0;
|
|
|
+ int encodedIndex = 0;
|
|
|
+ int dataIndex = 0;
|
|
|
+ if (fDebug) {
|
|
|
+ System.out.println("number of triplets = " + numberTriplets);
|
|
|
+ }
|
|
|
+ for (int i = 0; i < numberTriplets; i++) {
|
|
|
+ b1 = binaryData[dataIndex++];
|
|
|
+ b2 = binaryData[dataIndex++];
|
|
|
+ b3 = binaryData[dataIndex++];
|
|
|
+ if (fDebug) {
|
|
|
+ System.out.println("b1= " + b1 + ", b2= " + b2 + ", b3= " + b3);
|
|
|
+ }
|
|
|
+ l = (byte) (b2 & 0x0f);
|
|
|
+ k = (byte) (b1 & 0x03);
|
|
|
+ byte val1 = ((b1 & SIGN) == 0) ? (byte) (b1 >> 2) : (byte) ((b1) >> 2 ^ 0xc0);
|
|
|
+ byte val2 = ((b2 & SIGN) == 0) ? (byte) (b2 >> 4) : (byte) ((b2) >> 4 ^ 0xf0);
|
|
|
+ byte val3 = ((b3 & SIGN) == 0) ? (byte) (b3 >> 6) : (byte) ((b3) >> 6 ^ 0xfc);
|
|
|
+ if (fDebug) {
|
|
|
+ System.out.println("val2 = " + val2);
|
|
|
+ System.out.println("k4 = " + (k << 4));
|
|
|
+ System.out.println("vak = " + (val2 | (k << 4)));
|
|
|
+ }
|
|
|
+ encodedData[encodedIndex++] = lookUpBase64Alphabet[val1];
|
|
|
+ encodedData[encodedIndex++] = lookUpBase64Alphabet[val2 | (k << 4)];
|
|
|
+ encodedData[encodedIndex++] = lookUpBase64Alphabet[(l << 2) | val3];
|
|
|
+ encodedData[encodedIndex++] = lookUpBase64Alphabet[b3 & 0x3f];
|
|
|
+ }
|
|
|
+
|
|
|
+ // form integral number of 6-bit groups
|
|
|
+ if (fewerThan24bits == EIGHTBIT) {
|
|
|
+ b1 = binaryData[dataIndex];
|
|
|
+ k = (byte) (b1 & 0x03);
|
|
|
+ if (fDebug) {
|
|
|
+ System.out.println("b1=" + b1);
|
|
|
+ System.out.println("b1<<2 = " + (b1 >> 2));
|
|
|
+ }
|
|
|
+ byte val1 = ((b1 & SIGN) == 0) ? (byte) (b1 >> 2) : (byte) ((b1) >> 2 ^ 0xc0);
|
|
|
+ encodedData[encodedIndex++] = lookUpBase64Alphabet[val1];
|
|
|
+ encodedData[encodedIndex++] = lookUpBase64Alphabet[k << 4];
|
|
|
+ encodedData[encodedIndex++] = PAD;
|
|
|
+ encodedData[encodedIndex++] = PAD;
|
|
|
+ } else if (fewerThan24bits == SIXTEENBIT) {
|
|
|
+ b1 = binaryData[dataIndex];
|
|
|
+ b2 = binaryData[dataIndex + 1];
|
|
|
+ l = (byte) (b2 & 0x0f);
|
|
|
+ k = (byte) (b1 & 0x03);
|
|
|
+ byte val1 = ((b1 & SIGN) == 0) ? (byte) (b1 >> 2) : (byte) ((b1) >> 2 ^ 0xc0);
|
|
|
+ byte val2 = ((b2 & SIGN) == 0) ? (byte) (b2 >> 4) : (byte) ((b2) >> 4 ^ 0xf0);
|
|
|
+ encodedData[encodedIndex++] = lookUpBase64Alphabet[val1];
|
|
|
+ encodedData[encodedIndex++] = lookUpBase64Alphabet[val2 | (k << 4)];
|
|
|
+ encodedData[encodedIndex++] = lookUpBase64Alphabet[l << 2];
|
|
|
+ encodedData[encodedIndex++] = PAD;
|
|
|
+ }
|
|
|
+ return new String(encodedData);
|
|
|
+ }
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Decodes Base64 data into octects
|
|
|
+ *
|
|
|
+ * @param encoded string containing Base64 data
|
|
|
+ * @return Array containind decoded data.
|
|
|
+ */
|
|
|
+ public static byte[] decode(String encoded) {
|
|
|
+ if (encoded == null) {
|
|
|
+ return null;
|
|
|
+ }
|
|
|
+ char[] base64Data = encoded.toCharArray();
|
|
|
+ // remove white spaces
|
|
|
+ int len = removeWhiteSpace(base64Data);
|
|
|
+ if (len % FOURBYTE != 0) {
|
|
|
+ return null;// should be divisible by four
|
|
|
+ }
|
|
|
+ int numberQuadruple = (len / FOURBYTE);
|
|
|
+ if (numberQuadruple == 0) {
|
|
|
+ return new byte[0];
|
|
|
+ }
|
|
|
+ byte decodedData[] = null;
|
|
|
+ byte b1 = 0, b2 = 0, b3 = 0, b4 = 0;
|
|
|
+ char d1 = 0, d2 = 0, d3 = 0, d4 = 0;
|
|
|
+ int i = 0;
|
|
|
+ int encodedIndex = 0;
|
|
|
+ int dataIndex = 0;
|
|
|
+ decodedData = new byte[(numberQuadruple) * 3];
|
|
|
+ for (; i < numberQuadruple - 1; i++) {
|
|
|
+ if (!isData((d1 = base64Data[dataIndex++])) || !isData((d2 = base64Data[dataIndex++]))
|
|
|
+ || !isData((d3 = base64Data[dataIndex++])) || !isData((d4 = base64Data[dataIndex++]))) {
|
|
|
+ return null;
|
|
|
+ } // if found "no data" just return null
|
|
|
+ b1 = base64Alphabet[d1];
|
|
|
+ b2 = base64Alphabet[d2];
|
|
|
+ b3 = base64Alphabet[d3];
|
|
|
+ b4 = base64Alphabet[d4];
|
|
|
+ decodedData[encodedIndex++] = (byte) (b1 << 2 | b2 >> 4);
|
|
|
+ decodedData[encodedIndex++] = (byte) (((b2 & 0xf) << 4) | ((b3 >> 2) & 0xf));
|
|
|
+ decodedData[encodedIndex++] = (byte) (b3 << 6 | b4);
|
|
|
+ }
|
|
|
+ if (!isData((d1 = base64Data[dataIndex++])) || !isData((d2 = base64Data[dataIndex++]))) {
|
|
|
+ return null;// if found "no data" just return null
|
|
|
+ }
|
|
|
+ b1 = base64Alphabet[d1];
|
|
|
+ b2 = base64Alphabet[d2];
|
|
|
+ d3 = base64Data[dataIndex++];
|
|
|
+ d4 = base64Data[dataIndex++];
|
|
|
+ if (!isData((d3)) || !isData((d4))) {// Check if they are PAD characters
|
|
|
+ if (isPad(d3) && isPad(d4)) {
|
|
|
+ if ((b2 & 0xf) != 0)// last 4 bits should be zero
|
|
|
+ {
|
|
|
+ return null;
|
|
|
+ }
|
|
|
+ byte[] tmp = new byte[i * 3 + 1];
|
|
|
+ System.arraycopy(decodedData, 0, tmp, 0, i * 3);
|
|
|
+ tmp[encodedIndex] = (byte) (b1 << 2 | b2 >> 4);
|
|
|
+ return tmp;
|
|
|
+ } else if (!isPad(d3) && isPad(d4)) {
|
|
|
+ b3 = base64Alphabet[d3];
|
|
|
+ if ((b3 & 0x3) != 0)// last 2 bits should be zero
|
|
|
+ {
|
|
|
+ return null;
|
|
|
+ }
|
|
|
+ byte[] tmp = new byte[i * 3 + 2];
|
|
|
+ System.arraycopy(decodedData, 0, tmp, 0, i * 3);
|
|
|
+ tmp[encodedIndex++] = (byte) (b1 << 2 | b2 >> 4);
|
|
|
+ tmp[encodedIndex] = (byte) (((b2 & 0xf) << 4) | ((b3 >> 2) & 0xf));
|
|
|
+ return tmp;
|
|
|
+ } else {
|
|
|
+ return null;
|
|
|
+ }
|
|
|
+ } else { // No PAD e.g 3cQl
|
|
|
+ b3 = base64Alphabet[d3];
|
|
|
+ b4 = base64Alphabet[d4];
|
|
|
+ decodedData[encodedIndex++] = (byte) (b1 << 2 | b2 >> 4);
|
|
|
+ decodedData[encodedIndex++] = (byte) (((b2 & 0xf) << 4) | ((b3 >> 2) & 0xf));
|
|
|
+ decodedData[encodedIndex++] = (byte) (b3 << 6 | b4);
|
|
|
+ }
|
|
|
+
|
|
|
+ return decodedData;
|
|
|
+ }
|
|
|
+
|
|
|
+ /**
|
|
|
+ * remove WhiteSpace from MIME containing encoded Base64 data.
|
|
|
+ *
|
|
|
+ * @param data the byte array of base64 data (with WS)
|
|
|
+ * @return the new length
|
|
|
+ */
|
|
|
+ private static int removeWhiteSpace(char[] data) {
|
|
|
+ if (data == null) {
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+ // count characters that's not whitespace
|
|
|
+ int newSize = 0;
|
|
|
+ int len = data.length;
|
|
|
+ for (int i = 0; i < len; i++) {
|
|
|
+ if (!isWhiteSpace(data[i])) {
|
|
|
+ data[newSize++] = data[i];
|
|
|
+ }
|
|
|
+ }
|
|
|
+ return newSize;
|
|
|
+ }
|
|
|
+
|
|
|
+ private static String base64hash = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Matcher Check
|
|
|
+ *
|
|
|
+ * @param inStr
|
|
|
+ * @param reg
|
|
|
+ * @return
|
|
|
+ */
|
|
|
+ public static boolean isMatcher(String inStr, String reg) {
|
|
|
+ Pattern pattern = Pattern.compile(reg);
|
|
|
+ Matcher matcher = pattern.matcher(inStr);
|
|
|
+ if (matcher.matches()) {
|
|
|
+ return true;
|
|
|
+ }
|
|
|
+ return false;
|
|
|
+ }
|
|
|
+
|
|
|
+ /**
|
|
|
+ * btoa
|
|
|
+ *
|
|
|
+ * @param inStr
|
|
|
+ * @return
|
|
|
+ */
|
|
|
+ public static String btoa(String inStr) {
|
|
|
+
|
|
|
+ // if (/([^\u0000-\u00ff])/.test(s)) {
|
|
|
+ // throw new Error('INVALID_CHARACTER_ERR');
|
|
|
+ // }
|
|
|
+ if (inStr == null || isMatcher(inStr, "([^\\u0000-\\u00ff])")) {
|
|
|
+ return null;
|
|
|
+ }
|
|
|
+
|
|
|
+ StringBuilder result = new StringBuilder();
|
|
|
+
|
|
|
+ int i = 0;
|
|
|
+ int mod = 0;
|
|
|
+ int ascii;
|
|
|
+ int prev = 0;
|
|
|
+ while (i < inStr.length()) {
|
|
|
+ ascii = inStr.charAt(i);
|
|
|
+ mod = i % 3;
|
|
|
+
|
|
|
+ switch (mod) {
|
|
|
+ case 0:
|
|
|
+ result.append(String.valueOf(base64hash.charAt(ascii >> 2)));
|
|
|
+ break;
|
|
|
+ case 1:
|
|
|
+
|
|
|
+ result.append(String.valueOf(base64hash.charAt((prev & 3) << 4 | (ascii >> 4))));
|
|
|
+ break;
|
|
|
+ case 2:
|
|
|
+ result.append(String.valueOf(base64hash.charAt((prev & 0x0f) << 2 | (ascii >> 6))));
|
|
|
+ result.append(String.valueOf(base64hash.charAt(ascii & 0x3f)));
|
|
|
+ break;
|
|
|
+
|
|
|
+ }
|
|
|
+
|
|
|
+ prev = ascii;
|
|
|
+ i++;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (mod == 0) {
|
|
|
+ result.append(String.valueOf(base64hash.charAt((prev & 3) << 4)));
|
|
|
+ result.append("==");
|
|
|
+ } else if (mod == 1) {
|
|
|
+ result.append(String.valueOf(base64hash.charAt((prev & 0x0f) << 2)));
|
|
|
+ result.append("=");
|
|
|
+ }
|
|
|
+
|
|
|
+ return result.toString();
|
|
|
+ }
|
|
|
+
|
|
|
+ /**
|
|
|
+ * atob
|
|
|
+ *
|
|
|
+ * @param inStr
|
|
|
+ * @return
|
|
|
+ */
|
|
|
+ public static String atob(String inStr) {
|
|
|
+ if (inStr == null)
|
|
|
+ return null;
|
|
|
+ // s = s.replace(/\s|=/g, '');
|
|
|
+ inStr = inStr.replaceAll("\\s|=", "");
|
|
|
+ StringBuilder result = new StringBuilder();
|
|
|
+
|
|
|
+ int cur;
|
|
|
+ int prev = -1;
|
|
|
+ // Integer prev=null;
|
|
|
+ int mod;
|
|
|
+ int i = 0;
|
|
|
+
|
|
|
+ while (i < inStr.length()) {
|
|
|
+ cur = base64hash.indexOf(inStr.charAt(i));
|
|
|
+ mod = i % 4;
|
|
|
+ switch (mod) {
|
|
|
+ case 0:
|
|
|
+ break;
|
|
|
+ case 1:
|
|
|
+ result.append(String.valueOf((char) (prev << 2 | cur >> 4)));
|
|
|
+ break;
|
|
|
+ case 2:
|
|
|
+
|
|
|
+ result.append(String.valueOf((char) ((prev & 0x0f) << 4 | cur >> 2)));
|
|
|
+ break;
|
|
|
+ case 3:
|
|
|
+
|
|
|
+ result.append(String.valueOf((char) ((prev & 3) << 6 | cur)));
|
|
|
+ break;
|
|
|
+ }
|
|
|
+
|
|
|
+ prev = cur;
|
|
|
+ i++;
|
|
|
+ }
|
|
|
+
|
|
|
+ return result.toString();
|
|
|
+ }
|
|
|
+
|
|
|
+}
|