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// natCollator.cc - Native code for collation.

/* Copyright (C) 1999  Free Software Foundation

   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 <gcj/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;

    }

  const 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);

    }

}