diff options
Diffstat (limited to 'gcc-4.4.3/libjava/classpath/gnu/CORBA/BigDecimalHelper.java')
| -rw-r--r-- | gcc-4.4.3/libjava/classpath/gnu/CORBA/BigDecimalHelper.java | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/gcc-4.4.3/libjava/classpath/gnu/CORBA/BigDecimalHelper.java b/gcc-4.4.3/libjava/classpath/gnu/CORBA/BigDecimalHelper.java new file mode 100644 index 000000000..33b74bb77 --- /dev/null +++ b/gcc-4.4.3/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; + } +} |