From a48b473168af07a3b0f1c441196ec28179c6ad7b Mon Sep 17 00:00:00 2001
From: megacz <megacz@xwt.org>
Date: Fri, 30 Jan 2004 06:51:16 +0000
Subject: [PATCH] 2003/02/12 06:21:05

darcs-hash:20040130065116-2ba56-f4005ef8319103543a85eb171f01e69866687c66.gz
---
 .../bouncycastle/crypto/io/DigestOutputStream.java |   41 ++++++++++++++++++++
 src/org/bouncycastle/util/encoders/Base64.java     |   38 ++++++++----------
 2 files changed, 57 insertions(+), 22 deletions(-)
 create mode 100644 src/org/bouncycastle/crypto/io/DigestOutputStream.java

diff --git a/src/org/bouncycastle/crypto/io/DigestOutputStream.java b/src/org/bouncycastle/crypto/io/DigestOutputStream.java
new file mode 100644
index 0000000..a2b00a6
--- /dev/null
+++ b/src/org/bouncycastle/crypto/io/DigestOutputStream.java
@@ -0,0 +1,41 @@
+package org.bouncycastle.crypto.io;
+
+import java.io.*;
+
+import org.bouncycastle.crypto.Digest;
+
+public class DigestOutputStream
+    extends FilterOutputStream
+{
+    protected Digest digest;
+
+    public DigestOutputStream(
+        OutputStream    stream,
+        Digest          digest)
+    {
+        super(stream);
+        this.digest = digest;
+    }
+
+    public void write(int b)
+        throws IOException
+    {
+        digest.update((byte)b);
+        out.write(b);
+    }
+
+    public void write(
+        byte[] b,
+        int off,
+        int len)
+        throws IOException
+    {
+        digest.update(b, off, len);
+        out.write(b, off, len);
+    }
+
+    public Digest getDigest()
+    {
+        return digest;
+    }
+}
diff --git a/src/org/bouncycastle/util/encoders/Base64.java b/src/org/bouncycastle/util/encoders/Base64.java
index 423fb30..448e0ac 100644
--- a/src/org/bouncycastle/util/encoders/Base64.java
+++ b/src/org/bouncycastle/util/encoders/Base64.java
@@ -2,7 +2,7 @@ package org.bouncycastle.util.encoders;
 
 public class Base64
 {
-	private static byte[] encodingTable =
+	private static final byte[] encodingTable =
 		{
 		    (byte)'A', (byte)'B', (byte)'C', (byte)'D', (byte)'E', (byte)'F', (byte)'G',
             (byte)'H', (byte)'I', (byte)'J', (byte)'K', (byte)'L', (byte)'M', (byte)'N',
@@ -27,8 +27,9 @@ public class Base64
 		byte[]	data)
 	{
 		byte[]	bytes;
-
-		if ((data.length % 3) == 0)
+		
+		int modulus = data.length % 3;
+		if (modulus == 0)
 		{
 			bytes = new byte[4 * data.length / 3];
 		}
@@ -37,25 +38,18 @@ public class Base64
 			bytes = new byte[4 * ((data.length / 3) + 1)];
 		}
 
-		for (int i = 0, j = 0;
-				i < ((data.length / 3) * 3); i += 3, j += 4)
+        int dataLength = (data.length - modulus);
+		int a1, a2, a3;
+		for (int i = 0, j = 0; i < dataLength; i += 3, j += 4)
 		{
-			int	b1, b2, b3, b4;
-			int	d1, d2, d3;
-
-			d1 = data[i] & 0xff;
-			d2 = data[i + 1] & 0xff;
-			d3 = data[i + 2] & 0xff;
-
-			b1 = (d1 >>> 2) & 0x3f;
-			b2 = ((d1 << 4) | (d2 >>> 4)) & 0x3f;
-			b3 = ((d2 << 2) | (d3 >>> 6)) & 0x3f;
-			b4 = d3 & 0x3f;
+			a1 = data[i] & 0xff;
+			a2 = data[i + 1] & 0xff;
+			a3 = data[i + 2] & 0xff;
 
-			bytes[j] = encodingTable[b1];
-			bytes[j + 1] = encodingTable[b2];
-			bytes[j + 2] = encodingTable[b3];
-			bytes[j + 3] = encodingTable[b4];
+			bytes[j] = encodingTable[(a1 >>> 2) & 0x3f];
+			bytes[j + 1] = encodingTable[((a1 << 4) | (a2 >>> 4)) & 0x3f];
+			bytes[j + 2] = encodingTable[((a2 << 2) | (a3 >>> 6)) & 0x3f];
+			bytes[j + 3] = encodingTable[a3 & 0x3f];
 		}
 
 		/*
@@ -64,7 +58,7 @@ public class Base64
 		int	b1, b2, b3;
 		int	d1, d2;
 
-		switch (data.length % 3)
+		switch (modulus)
 		{
 		case 0:		/* nothing left to do */
 			break;
@@ -99,7 +93,7 @@ public class Base64
 	/*
 	 * set up the decoding table.
 	 */
-	private static byte[] decodingTable;
+	private static final byte[] decodingTable;
 
 	static
 	{
-- 
1.7.10.4