From 5d7b65670282a4fad015e37d567cfa171b162052 Mon Sep 17 00:00:00 2001
From: huliguo <2023611923@qq.com>
Date: 星期二, 20 五月 2025 12:25:19 +0800
Subject: [PATCH] 基础代码
---
pt-common/src/main/java/com/ruoyi/common/utils/sign/Base64.java | 291 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 291 insertions(+), 0 deletions(-)
diff --git a/pt-common/src/main/java/com/ruoyi/common/utils/sign/Base64.java b/pt-common/src/main/java/com/ruoyi/common/utils/sign/Base64.java
new file mode 100644
index 0000000..ca1cd92
--- /dev/null
+++ b/pt-common/src/main/java/com/ruoyi/common/utils/sign/Base64.java
@@ -0,0 +1,291 @@
+package com.ruoyi.common.utils.sign;
+
+/**
+ * Base64工具类
+ *
+ * @author ruoyi
+ */
+public final class Base64
+{
+ static private final int BASELENGTH = 128;
+ static private final int LOOKUPLENGTH = 64;
+ static private final int TWENTYFOURBITGROUP = 24;
+ static private final int EIGHTBIT = 8;
+ static private final int SIXTEENBIT = 16;
+ static private final int FOURBYTE = 4;
+ static private final int SIGN = -128;
+ static private final char PAD = '=';
+ static final private byte[] base64Alphabet = new byte[BASELENGTH];
+ static final private 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;
+
+ for (int i = 0; i < numberTriplets; i++)
+ {
+ b1 = binaryData[dataIndex++];
+ b2 = binaryData[dataIndex++];
+ b3 = binaryData[dataIndex++];
+
+ 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);
+
+ 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);
+ 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;
+ }
+}
--
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