1 files changed, 137 insertions, 0 deletions
diff --git a/Java/basE91.java b/Java/basE91.java
new file mode 100644
index 0000000..56d7fda
--- /dev/null
+++ b/Java/basE91.java
@@ -0,0 +1,137 @@
+/*
+ * basE91 encoding/decoding routines
+ *
+ * Copyright (c) 2000-2006 Joachim Henke
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *  - Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ *  - Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *  - Neither the name of Joachim Henke nor the names of his contributors may
+ *    be used to endorse or promote products derived from this software without
+ *    specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+public class basE91
+{
+	private int ebq, en, dbq, dn, dv;
+	public final byte[] enctab;
+	private final byte[] dectab;
+
+	public int encode(byte[] ib, int n, byte[] ob)
+	{
+		int i, c = 0;
+
+		for (i = 0; i < n; ++i) {
+			ebq |= (ib[i] & 255) << en;
+			en += 8;
+			if (en > 13) {
+				int ev = ebq & 8191;
+
+				if (ev > 88) {
+					ebq >>= 13;
+					en -= 13;
+				} else {
+					ev = ebq & 16383;
+					ebq >>= 14;
+					en -= 14;
+				}
+				ob[c++] = enctab[ev % 91];
+				ob[c++] = enctab[ev / 91];
+			}
+		}
+		return c;
+	}
+
+	public int encEnd(byte[] ob)
+	{
+		int c = 0;
+
+		if (en > 0) {
+			ob[c++] = enctab[ebq % 91];
+			if (en > 7 || ebq > 90)
+				ob[c++] = enctab[ebq / 91];
+		}
+		encReset();
+		return c;
+	}
+
+	public void encReset()
+	{
+		ebq = 0;
+		en = 0;
+	}
+
+	public int decode(byte[] ib, int n, byte[] ob)
+	{
+		int i, c = 0;
+
+		for (i = 0; i < n; ++i) {
+			if (dectab[ib[i]] == -1)
+				continue;
+			if (dv == -1)
+				dv = dectab[ib[i]];
+			else {
+				dv += dectab[ib[i]] * 91;
+				dbq |= dv << dn;
+				dn += (dv & 8191) > 88 ? 13 : 14;
+				do {
+					ob[c++] = (byte) dbq;
+					dbq >>= 8;
+					dn -= 8;
+				} while (dn > 7);
+				dv = -1;
+			}
+		}
+		return c;
+	}
+
+	public int decEnd(byte[] ob)
+	{
+		int c = 0;
+
+		if (dv != -1)
+			ob[c++] = (byte) (dbq | dv << dn);
+		decReset();
+		return c;
+	}
+
+	public void decReset()
+	{
+		dbq = 0;
+		dn = 0;
+		dv = -1;
+	}
+
+	public basE91()
+	{
+		int i;
+		String ts = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789!#$%&()*+,./:;<=>?@[]^_`{|}~\"";
+
+		enctab = ts.getBytes();
+		dectab = new byte[256];
+		for (i = 0; i < 256; ++i)
+			dectab[i] = -1;
+		for (i = 0; i < 91; ++i)
+			dectab[enctab[i]] = (byte) i;
+		encReset();
+		decReset();
+	}
+}