moved base64 converter to util

2026-09-27 10:03:11 +07:00 · 2010-07-23 15:49:27 +04:00
parent cce7d6dc0a
commit ebaf9bd41a
1 changed files with 88 additions and 0 deletions
@@ -0,0 +1,88 @@
+package com.intellij.util;
+
+/**
+ * Created by IntelliJ IDEA.
+ * User: maxim
+ * Date: 18.07.2006
+ * Time: 21:16:57
+ * To change this template use File | Settings | File Templates.
+ */
+public class Base64Converter {
+  public static final char [ ] alphabet = {
+    'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',   //  0 to  7
+    'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',   //  8 to 15
+    'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',   // 16 to 23
+    'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',   // 24 to 31
+    'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',   // 32 to 39
+    'o', 'p', 'q', 'r', 's', 't', 'u', 'v',   // 40 to 47
+    'w', 'x', 'y', 'z', '0', '1', '2', '3',   // 48 to 55
+    '4', '5', '6', '7', '8', '9', '+', '/'}; // 56 to 63
+
+  //////////////////////////////////////////////////////////////////////
+  //////////////////////////////////////////////////////////////////////
+
+  public static String encode(String s)
+  //////////////////////////////////////////////////////////////////////
+  {
+    return encode(s.getBytes());
+  }
+
+  public static String encode(byte [ ]  octetString)
+  //////////////////////////////////////////////////////////////////////
+  {
+    int bits24;
+    int bits6;
+
+    char [ ]  out
+      = new char [ ((octetString.length - 1) / 3 + 1) * 4 ];
+
+    int outIndex = 0;
+    int i = 0;
+
+    while ((i + 3) <= octetString.length) {
+      // store the octets
+      bits24 = (octetString[i++] & 0xFF) << 16;
+      bits24 |= (octetString[i++] & 0xFF) << 8;
+      bits24 |= (octetString[i++] & 0xFF) << 0;
+
+      bits6 = (bits24 & 0x00FC0000) >> 18;
+      out[outIndex++] = alphabet[bits6];
+      bits6 = (bits24 & 0x0003F000) >> 12;
+      out[outIndex++] = alphabet[bits6];
+      bits6 = (bits24 & 0x00000FC0) >> 6;
+      out[outIndex++] = alphabet[bits6];
+      bits6 = (bits24 & 0x0000003F);
+      out[outIndex++] = alphabet[bits6];
+    }
+
+    if (octetString.length - i == 2) {
+      // store the octets
+      bits24 = (octetString[i] & 0xFF) << 16;
+      bits24 |= (octetString[i + 1] & 0xFF) << 8;
+
+      bits6 = (bits24 & 0x00FC0000) >> 18;
+      out[outIndex++] = alphabet[bits6];
+      bits6 = (bits24 & 0x0003F000) >> 12;
+      out[outIndex++] = alphabet[bits6];
+      bits6 = (bits24 & 0x00000FC0) >> 6;
+      out[outIndex++] = alphabet[bits6];
+
+      // padding
+      out[outIndex++] = '=';
+    } else if (octetString.length - i == 1) {
+      // store the octets
+      bits24 = (octetString[i] & 0xFF) << 16;
+
+      bits6 = (bits24 & 0x00FC0000) >> 18;
+      out[outIndex++] = alphabet[bits6];
+      bits6 = (bits24 & 0x0003F000) >> 12;
+      out[outIndex++] = alphabet[bits6];
+
+      // padding
+      out[outIndex++] = '=';
+      out[outIndex++] = '=';
+    }
+
+    return new String(out);
+  }
+}