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1 files changed, 191 insertions, 0 deletions

diff --git a/libjava/classpath/gnu/CORBA/BigDecimalHelper.java b/libjava/classpath/gnu/CORBA/BigDecimalHelper.java
new file mode 100644
index 000000000..c5c8f99ab
--- /dev/null
+++ b/libjava/classpath/gnu/CORBA/BigDecimalHelper.java
@@ -0,0 +1,191 @@
+/* BigDecimalHelper.java --
+   Copyright (C) 2005 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package gnu.CORBA;
+
+import gnu.java.lang.CPStringBuilder;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+
+import java.math.BigDecimal;
+import java.math.BigInteger;
+
+import org.omg.CORBA.TypeCodePackage.BadKind;
+
+/**
+ * Reads and writes BigDecimal as CORBA <code>fixed</code>.
+ * The format, described in CORBA specification, requires to store
+ * data in hexadecimal format, two digits per byte (oceted), most
+ * significant digit first. The last half-byte in the representation
+ * stores the sign, being 0xD for negative numbers and 0xC for
+ * zero and positive numbers. To have the even number of half bytes,
+ * 0x0 is appended to the beginning, if required. The position of the
+ * decimal point is not stored.
+ *
+ * @author Audrius Meskauskas (AudriusA@Bioinformatics.org)
+ */
+public class BigDecimalHelper
+{
+  {
+  }
+
+  /**
+   * @todo remove from the release version.
+   */
+  public static void main(String[] args)
+  {
+    try
+      {
+        ByteArrayOutputStream b = new ByteArrayOutputStream();
+        BigDecimal d = new BigDecimal("12234.54689");
+
+        write(b, d);
+
+        byte[] a = b.toByteArray();
+
+        for (int i = 0; i < a.length; i++)
+          {
+            int k = a [ i ] & 0xFF;
+            System.out.print(Integer.toHexString(k) + " ");
+          }
+
+        System.out.println("Now reading");
+
+        ByteArrayInputStream bin = new ByteArrayInputStream(a);
+
+        BigDecimal r = read(bin, d.scale());
+
+        System.out.println(r);
+      }
+    catch (Exception ex)
+      {
+        ex.printStackTrace();
+      }
+  }
+
+  /**
+   * Read the CORBA fixed, autodetecting the number of bytes
+   * and assuming the given scale.
+   */
+  public static BigDecimal read(java.io.InputStream in, int scale)
+                         throws IOException
+  {
+    ByteArrayOutputStream bout = new ByteArrayOutputStream();
+
+    int f;
+
+    do
+      {
+        f = in.read();
+        if (f >= 0)
+          bout.write(f);
+      }
+    // The last byte has 0xC or 0xD in the last halfbyte.
+    while ((f & 0xF) <= 0x9);
+
+    return createFixed(scale, bout.toByteArray());
+  }
+
+  /**
+   * Write the big decimal as CORBA <code>fixed<.code>.
+   * The scale will not be stored.
+   *
+   * @param out a stream to write into.
+   * @param x a big decimal to write.
+   *
+   * @throws IOException if the stream write method throws one.
+   * @throws BadKind if this BigDecimal has more digits than
+   * specified.
+   */
+  public static void write(java.io.OutputStream out, BigDecimal x)
+                    throws IOException, BadKind
+  {
+    CPStringBuilder v = new CPStringBuilder(x.unscaledValue().toString());
+
+    boolean negative = v.charAt(0) == '-';
+
+    if (negative)
+      v = v.deleteCharAt(0);
+
+    if ( (v.length() & 1) == 0)
+      v.insert(0, '0');
+
+    int c;
+
+    for (int i = 0; i < v.length() - 1; i = i + 2)
+      {
+        c = ((v.charAt(i) - '0') << 4) | (v.charAt(i + 1) - '0');
+        out.write(c);
+      }
+
+    c = ((v.charAt(v.length() - 1) - '0') << 4) | (negative ? 0xD : 0xC);
+
+    out.write(c);
+  }
+
+  /**
+   * Convert the loaded byte array, representing
+   * CORBA <code>fixed</code>, into an instance of
+   * the {@link BigDecimal}
+   */
+  private static BigDecimal createFixed(int scale, byte[] d)
+  {
+    CPStringBuilder s = new CPStringBuilder(2 * d.length);
+
+    int last = d.length - 1;
+
+    if ((d [ last ] & 0xF) == 0xD)
+      s.append('-');
+
+    if (last > 0)
+      for (int i = 0; i < last; i++)
+        {
+          s.append((char) (((d [ i ] >> 4) & 0xF) + '0'));
+          s.append((char) (((d [ i ]) & 0xF) + '0'));
+        }
+
+    s.append((char) (((d [ last ] >> 4) & 0xF) + '0'));
+
+    BigInteger b = new BigInteger(s.toString());
+    BigDecimal dec = new BigDecimal(b, scale);
+
+    return dec;
+  }
+}