* natCollator.cc: New file.

From-SVN: r26655

libjava/ChangeLog

@@ -1,5 +1,7 @@
 1999-04-26  Tom Tromey  <tromey@cygnus.com>
 
+	* natCollator.cc: New file.
+
 	* java/util/GregorianCalendar.java (setDefaultTime): New method.
 	(GregorianCalendar): Use it in all constructors.
 	* java/util/Calendar.java (Calendar): Changed argument name to

libjava/java/text/natCollator.cc

@@ -0,0 +1,74 @@
+// natCollator.cc - Native code for collation.
+
+/* Copyright (C) 1999  Cygnus Solutions
+
+   This file is part of libgcj.
+
+This software is copyrighted work licensed under the terms of the
+Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
+details.  */
+
+// Written by Tom Tromey <tromey@cygnus.com>.
+
+#include <config.h>
+
+#include <cni.h>
+#include <jvm.h>
+
+#include <java/text/Collator.h>
+#include <java/lang/StringBuffer.h>
+
+#include <java-chardecomp.h>
+
+void
+java::text::Collator::decomposeCharacter (jchar c,
+					  java::lang::StringBuffer *buf)
+{
+  if (decmp == NO_DECOMPOSITION)
+    {
+      buf->append(c);
+      return;
+    }
+
+  struct decomp_entry *base;
+  int high;
+
+  if (decmp == FULL_DECOMPOSITION)
+    {
+      base = full_decomposition;
+      high = sizeof (full_decomposition) / sizeof (struct decomp_entry);
+    }
+  else
+    {
+      base = canonical_decomposition;
+      high = sizeof (canonical_decomposition) / sizeof (struct decomp_entry);
+    }
+
+  // FIXME: this is probably a bit slow for the task at hand.
+  int i = high / 2;
+  int low = 0;
+  while (true)
+    {
+      if (c < base[i].key)
+	high = i;
+      else if (c > base[i].key)
+	low = i;
+      else
+	break;
+
+      int old = i;
+      i = (high + low) / 2;
+      if (i == old)
+	{
+	  // Not in table, so it expands to itself.
+	  buf->append(c);
+	  return;
+	}
+    }
+
+  for (int j = 0; base[i].value[j] != '\0'; j += 2)
+    {
+      jchar x = (base[i].value[j] << 8) | (base[i].value[j + 1]);
+      buf->append (x);
+    }
+}