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Base32添加"="补码机制

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This commit is contained in:
micuncang 2022-03-16 00:25:16 +08:00
parent f1abd98b62
commit 9775868220
2 changed files with 16 additions and 7 deletions
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21
hutool-core/src/main/java/cn/hutool/core/codec/Base32.java
View File

@ -1,10 +1,10 @@
package cn.hutool.core.codec;
import java.nio.charset.Charset;
import cn.hutool.core.util.CharsetUtil;
import cn.hutool.core.util.StrUtil;
import java.nio.charset.Charset;
/**
* Base32 - encodes and decodes RFC3548 Base32 (see http://www.faqs.org/rfcs/rfc3548.html )<br>
* base32就是用32（2的5次方）个特定ASCII码来表示256个ASCII码。<br>
@ -30,6 +30,7 @@ public class Base32 {
0x0F, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, // 'p', 'q', 'r', 's', 't', 'u', 'v', 'w'
0x17, 0x18, 0x19, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF // 'x', 'y', 'z', '{', '|', '}', '~', 'DEL'
};
private static final int[] BASE32_FILL = {-1, 4, 1, 6, 3};
//----------------------------------------------------------------------------------------- encode
/**
@ -43,10 +44,17 @@ public class Base32 {
int digit;
int currByte;
int nextByte;
StringBuilder base32 = new StringBuilder((bytes.length + 7) * 8 / 5);
int encodeLen = bytes.length * 8 / 5;
if (encodeLen != 0) {
encodeLen = encodeLen + 1 + BASE32_FILL[(bytes.length * 8) % 5];
}
StringBuilder base32 = new StringBuilder(encodeLen);
while (i < bytes.length) {
currByte = (bytes[i] >= 0) ? bytes[i] : (bytes[i] + 256); // unsign
// unsign
currByte = (bytes[i] >= 0) ? bytes[i] : (bytes[i] + 256);
/* Is the current digit going to span a byte boundary? */
if (index > 3) {
@ -71,7 +79,7 @@ public class Base32 {
base32.append(BASE32_CHARS.charAt(digit));
}
return base32.toString();
return StrUtil.fillAfter(base32.toString(), '=', encodeLen);
}
/**
@ -114,7 +122,8 @@ public class Base32 {
*/
public static byte[] decode(final String base32) {
int i, index, lookup, offset, digit;
byte[] bytes = new byte[base32.length() * 5 / 8];
int len = base32.endsWith("=") ? base32.indexOf("=") * 5 / 8 : base32.length() * 5 / 8;
byte[] bytes = new byte[len];
for (i = 0, index = 0, offset = 0; i < base32.length(); i++) {
lookup = base32.charAt(i) - '0';

2
hutool-core/src/test/java/cn/hutool/core/codec/Base32Test.java
View File

@ -9,7 +9,7 @@ public class Base32Test {
public void encodeAndDecodeTest(){
String a = "伦家是一个非常长的字符串";
String encode = Base32.encode(a);
Assert.assertEquals("4S6KNZNOW3TJRL7EXCAOJOFK5GOZ5ZNYXDUZLP7HTKCOLLMX46WKNZFYWI", encode);
Assert.assertEquals("4S6KNZNOW3TJRL7EXCAOJOFK5GOZ5ZNYXDUZLP7HTKCOLLMX46WKNZFYWI======", encode);
String decodeStr = Base32.decodeStr(encode);
Assert.assertEquals(a, decodeStr);