lib/cp1258.h

/*
 * 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.
 */

/*
 * CP1258
 */

#include "vietcomb.h"

static const unsigned char cp1258_comb_table[] = {
  0xcc, 0xec, 0xde, 0xd2, 0xf2,
};

static const unsigned short cp1258_2uni[128] = {
  /* 0x80 */
  0x20ac, 0xfffd, 0x201a, 0x0192, 0x201e, 0x2026, 0x2020, 0x2021,
  0x02c6, 0x2030, 0xfffd, 0x2039, 0x0152, 0xfffd, 0xfffd, 0xfffd,
  /* 0x90 */
  0xfffd, 0x2018, 0x2019, 0x201c, 0x201d, 0x2022, 0x2013, 0x2014,
  0x02dc, 0x2122, 0xfffd, 0x203a, 0x0153, 0xfffd, 0xfffd, 0x0178,
  /* 0xa0 */
  0x00a0, 0x00a1, 0x00a2, 0x00a3, 0x00a4, 0x00a5, 0x00a6, 0x00a7,
  0x00a8, 0x00a9, 0x00aa, 0x00ab, 0x00ac, 0x00ad, 0x00ae, 0x00af,
  /* 0xb0 */
  0x00b0, 0x00b1, 0x00b2, 0x00b3, 0x00b4, 0x00b5, 0x00b6, 0x00b7,
  0x00b8, 0x00b9, 0x00ba, 0x00bb, 0x00bc, 0x00bd, 0x00be, 0x00bf,
  /* 0xc0 */
  0x00c0, 0x00c1, 0x00c2, 0x0102, 0x00c4, 0x00c5, 0x00c6, 0x00c7,
  0x00c8, 0x00c9, 0x00ca, 0x00cb, 0x0300, 0x00cd, 0x00ce, 0x00cf,
  /* 0xd0 */
  0x0110, 0x00d1, 0x0309, 0x00d3, 0x00d4, 0x01a0, 0x00d6, 0x00d7,
  0x00d8, 0x00d9, 0x00da, 0x00db, 0x00dc, 0x01af, 0x0303, 0x00df,
  /* 0xe0 */
  0x00e0, 0x00e1, 0x00e2, 0x0103, 0x00e4, 0x00e5, 0x00e6, 0x00e7,
  0x00e8, 0x00e9, 0x00ea, 0x00eb, 0x0301, 0x00ed, 0x00ee, 0x00ef,
  /* 0xf0 */
  0x0111, 0x00f1, 0x0323, 0x00f3, 0x00f4, 0x01a1, 0x00f6, 0x00f7,
  0x00f8, 0x00f9, 0x00fa, 0x00fb, 0x00fc, 0x01b0, 0x20ab, 0x00ff,
};

/* CP1258 as a stateless encoding. Suitable for locales, but it has
   the drawback that it can produce Unicode strings which are not
   in Normalization Form C and therefore not suitable for interchange.
   FIXME: It should produce Normalization Form C instead. */

static int
cp1258_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
{
  unsigned char c = *s;
  if (c < 0x80) {
    *pwc = (ucs4_t) c;
    return 1;
  }
  else {
    unsigned short wc = cp1258_2uni[c-0x80];
    if (wc != 0xfffd) {
      *pwc = (ucs4_t) wc;
      return 1;
    }
  }
  return RET_ILSEQ;
}

static const unsigned char cp1258_page00[88] = {
  0xc0, 0xc1, 0xc2, 0x00, 0xc4, 0xc5, 0xc6, 0xc7, /* 0xc0-0xc7 */
  0xc8, 0xc9, 0xca, 0xcb, 0x00, 0xcd, 0xce, 0xcf, /* 0xc8-0xcf */
  0x00, 0xd1, 0x00, 0xd3, 0xd4, 0x00, 0xd6, 0xd7, /* 0xd0-0xd7 */
  0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0x00, 0x00, 0xdf, /* 0xd8-0xdf */
  0xe0, 0xe1, 0xe2, 0x00, 0xe4, 0xe5, 0xe6, 0xe7, /* 0xe0-0xe7 */
  0xe8, 0xe9, 0xea, 0xeb, 0x00, 0xed, 0xee, 0xef, /* 0xe8-0xef */
  0x00, 0xf1, 0x00, 0xf3, 0xf4, 0x00, 0xf6, 0xf7, /* 0xf0-0xf7 */
  0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0x00, 0x00, 0xff, /* 0xf8-0xff */
  /* 0x0100 */
  0x00, 0x00, 0xc3, 0xe3, 0x00, 0x00, 0x00, 0x00, /* 0x00-0x07 */
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x08-0x0f */
  0xd0, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x10-0x17 */
};
static const unsigned char cp1258_page01[104] = {
  0x00, 0x00, 0x8c, 0x9c, 0x00, 0x00, 0x00, 0x00, /* 0x50-0x57 */
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x58-0x5f */
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x60-0x67 */
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x68-0x6f */
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x70-0x77 */
  0x9f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x78-0x7f */
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x80-0x87 */
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x88-0x8f */
  0x00, 0x00, 0x83, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x90-0x97 */
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x98-0x9f */
  0xd5, 0xf5, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0xa0-0xa7 */
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xdd, /* 0xa8-0xaf */
  0xfd, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0xb0-0xb7 */
};
static const unsigned char cp1258_page02[32] = {
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x88, 0x00, /* 0xc0-0xc7 */
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0xc8-0xcf */
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0xd0-0xd7 */
  0x00, 0x00, 0x00, 0x00, 0x98, 0x00, 0x00, 0x00, /* 0xd8-0xdf */
};
static const unsigned char cp1258_page03[40] = {
  0xcc, 0xec, 0x00, 0xde, 0x00, 0x00, 0x00, 0x00, /* 0x00-0x07 */
  0x00, 0xd2, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x08-0x0f */
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x10-0x17 */
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x18-0x1f */
  0x00, 0x00, 0x00, 0xf2, 0x00, 0x00, 0x00, 0x00, /* 0x20-0x27 */
};
static const unsigned char cp1258_page20[48] = {
  0x00, 0x00, 0x00, 0x96, 0x97, 0x00, 0x00, 0x00, /* 0x10-0x17 */
  0x91, 0x92, 0x82, 0x00, 0x93, 0x94, 0x84, 0x00, /* 0x18-0x1f */
  0x86, 0x87, 0x95, 0x00, 0x00, 0x00, 0x85, 0x00, /* 0x20-0x27 */
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x28-0x2f */
  0x89, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x30-0x37 */
  0x00, 0x8b, 0x9b, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x38-0x3f */
};

static int
cp1258_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
{
  unsigned char c = 0;
  if (wc < 0x0080) {
    *r = wc;
    return 1;
  }
  else if (wc >= 0x00a0 && wc < 0x00c0)
    c = wc;
  else if (wc >= 0x00c0 && wc < 0x0118)
    c = cp1258_page00[wc-0x00c0];
  else if (wc >= 0x0150 && wc < 0x01b8)
    c = cp1258_page01[wc-0x0150];
  else if (wc >= 0x02c0 && wc < 0x02e0)
    c = cp1258_page02[wc-0x02c0];
  else if (wc >= 0x0300 && wc < 0x0328)
    c = cp1258_page03[wc-0x0300];
  else if (wc >= 0x0340 && wc < 0x0342) /* deprecated Vietnamese tone marks */
    c = cp1258_page03[wc-0x0340];
  else if (wc >= 0x2010 && wc < 0x2040)
    c = cp1258_page20[wc-0x2010];
  else if (wc == 0x20ab)
    c = 0xfe;
  else if (wc == 0x20ac)
    c = 0x80;
  else if (wc == 0x2122)
    c = 0x99;
  if (c != 0) {
    *r = c;
    return 1;
  }
  /* Try canonical decomposition. */
  {
    /* Binary search through viet_decomp_table. */
    unsigned int i1 = 0;
    unsigned int i2 = sizeof(viet_decomp_table)/sizeof(viet_decomp_table[0])-1;
    if (wc >= viet_decomp_table[i1].composed
        && wc <= viet_decomp_table[i2].composed) {
      unsigned int i;
      for (;;) {
        /* Here i2 - i1 > 0. */
        i = (i1+i2)>>1;
        if (wc == viet_decomp_table[i].composed)
          break;
        if (wc < viet_decomp_table[i].composed) {
          if (i1 == i)
            return RET_ILSEQ;
          /* Here i1 < i < i2. */
          i2 = i;
        } else {
          /* Here i1 <= i < i2. */
          if (i1 != i)
            i1 = i;
          else {
            /* Here i2 - i1 = 1. */
            i = i2;
            if (wc == viet_decomp_table[i].composed)
              break;
            else
              return RET_ILSEQ;
          }
        }
      }
      /* Found a canonical decomposition. */
      wc = viet_decomp_table[i].base;
      /* wc is one of 0x0020, 0x0041..0x005a, 0x0061..0x007a, 0x00a5, 0x00a8,
         0x00c2, 0x00c5..0x00c7, 0x00ca, 0x00cf, 0x00d3, 0x00d4, 0x00d6,
         0x00d8, 0x00da, 0x00dc, 0x00e2, 0x00e5..0x00e7, 0x00ea, 0x00ef,
         0x00f3, 0x00f4, 0x00f6, 0x00f8, 0x00fc, 0x0102, 0x0103, 0x01a0,
         0x01a1, 0x01af, 0x01b0. */
      if (wc < 0x0100)
        c = wc;
      else if (wc < 0x0118)
        c = cp1258_page00[wc-0x00c0];
      else
        c = cp1258_page01[wc-0x0150];
      if (n < 2)
        return RET_TOOSMALL;
      r[0] = c;
      r[1] = cp1258_comb_table[viet_decomp_table[i].comb1];
      return 2;
    }
  }
  return RET_ILSEQ;
}