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/* 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.  */

#include <config.h>

#include <gcj/cni.h>

#include <gnu/gcj/convert/Output_SJIS.h>

extern unsigned short Unicode_to_JIS[];

extern int trie_lookup (unsigned short *trie, unsigned short key);

static jint

convert_TO_SJIS (gnu::gcj::convert::Output_SJIS *encoder,

                          jchar *ptr, jint inlength)

{

  int orig_inlength = inlength;

  jint outbuf_length = encoder->buf->length;

  for (;;)

    {

      if (encoder->count >= outbuf_length)

        break;

      if (encoder->pending >= 0)

        {

          elements(encoder->buf)[encoder->count++] = encoder->pending;

          encoder->pending = -1;

          continue;

        }

      if (inlength == 0)

        break;

      jchar ch = *ptr++;

      inlength--;

      unsigned short val = trie_lookup(Unicode_to_JIS, ch);

      if (val < 0xFF)

        {

          if (val == 0xffff)

            val = '?';

        }

      else

        {

          int b1 = val >> 8;

          int b2 = val & 0xff;

          // From Lunde: "CJKV Informatio Processing", O'Reilly, 1999:

          int rowOffset = b1 < 95 ? 112 : 176;

          int cellOffset = (b1 & 1) != 0 ? (b2 > 95 ? 32 : 31) : 126;

          b1 = ((b1 + 1) >> 1) + rowOffset;

          b2 += cellOffset;

          val = b1;

          encoder->pending = b2;

        }

      elements(encoder->buf)[encoder->count++] = val;

    }

  return orig_inlength - inlength;

}

jint

gnu::gcj::convert::Output_SJIS::write (jcharArray inbuffer,

                                         jint inpos, jint inlength)

{

  return convert_TO_SJIS(this, &elements(inbuffer)[inpos], inlength);

}

jint

gnu::gcj::convert::Output_SJIS::write (jstring str, jint inpos,

                                         jint inlength, jcharArray)

{

  return convert_TO_SJIS(this, _Jv_GetStringChars(str)+inpos, inlength);

}