gb2312.h

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/*
 * Copyright (C) 1999-2001 Free Software Foundation, Inc.
 * This file is part of the GNU LIBICONV Library.
 *
 * The GNU LIBICONV Library is free software; you can redistribute it
 * and/or modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * The GNU LIBICONV Library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with the GNU LIBICONV Library; see the file COPYING.LIB.
 * If not, write to the Free Software Foundation, Inc., 59 Temple Place -
 * Suite 330, Boston, MA 02111-1307, USA.
 */

/*
 * GB2312.1980-0
 */

#include "conv.h"

#ifndef _ICONV_GB2312
#define _ICONV_GB2312

//#pragma pcrelconstdata on

static int gb2312_mbtowc (conv_t conv, gb2312_table &table, UInt32 *pwc, const unsigned char *s, int n)
{
  unsigned char c1 = s[0];
  if ((c1 >= 0x21 && c1 <= 0x29) || (c1 >= 0x30 && c1 <= 0x77)) {
    if (n >= 2) {
      unsigned char c2 = s[1];
      if (c2 >= 0x21 && c2 < 0x7f) {
        unsigned int i = 94 * (c1 - 0x21) + (c2 - 0x21);
        unsigned short wc = 0xfffd;
        if (i < 1410) {
          if (i < 831)
            wc = table.gb2312_2uni_page21[i];
        } else {
          if (i < 8178)
            wc = table.gb2312_2uni_page30[i-1410];
        }
        if (wc != 0xfffd) {
          *pwc = (UInt32) wc;
          return 2;
        }
      }
      return RET_ILSEQ;
    }
    return RET_TOOFEW(0);
  }
  return RET_ILSEQ;
}

static int gb2312_wctomb (conv_t conv, gb2312_table &table, unsigned char *r, UInt32 wc, int n)
{
  if (n >= 2) {
    const Summary16 *summary = NULL;
    if (wc >= 0x0000 && wc < 0x0460)
      summary = &table.gb2312_uni2indx_page00[(wc>>4)];
    else if (wc >= 0x2000 && wc < 0x2650)
      summary = &table.gb2312_uni2indx_page20[(wc>>4)-0x200];
    else if (wc >= 0x3000 && wc < 0x3230)
      summary = &table.gb2312_uni2indx_page30[(wc>>4)-0x300];
    else if (wc >= 0x4e00 && wc < 0x9cf0)
      summary = &table.gb2312_uni2indx_page4e[(wc>>4)-0x4e0];
    else if (wc >= 0x9e00 && wc < 0x9fb0)
      summary = &table.gb2312_uni2indx_page9e[(wc>>4)-0x9e0];
    else if (wc >= 0xff00 && wc < 0xfff0)
      summary = &table.gb2312_uni2indx_pageff[(wc>>4)-0xff0];
    if (summary) {
      unsigned short used = summary->used;
      unsigned int i = wc & 0x0f;
      if (used & ((unsigned short) 1 << i)) {
        unsigned short c;
        /* Keep in `used' only the bits 0..i-1. */
        used &= ((unsigned short) 1 << i) - 1;
        /* Add `summary->indx' and the number of bits set in `used'. */
        used = (used & 0x5555) + ((used & 0xaaaa) >> 1);
        used = (used & 0x3333) + ((used & 0xcccc) >> 2);
        used = (used & 0x0f0f) + ((used & 0xf0f0) >> 4);
        used = (used & 0x00ff) + (used >> 8);
        c = table.gb2312_2charset[summary->indx + used];
        r[0] = (c >> 8); r[1] = (c & 0xff);
        return 2;
      }
    }
    return RET_ILUNI;
  }
  return RET_TOOSMALL;
}

//#pragma pcrelconstdata off

#endif