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/* This is dvipdfmx, an eXtended version of dvipdfm by Mark A. Wicks.

    Copyright (C) 2002-2014 by Jin-Hwan Cho and Shunsaku Hirata,
    the dvipdfmx project team.

    Copyright (C) 1998, 1999 by Mark A. Wicks <mwicks@kettering.edu>

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program 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 General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/

/*
 * Unicode related:
 *  Conversion between UTF-* and UCS-*.
 *  ToUnicode CMap
 *
 * Normalization?
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <string.h>

#include "system.h"
#include "mem.h"
#include "error.h"

#include "unicode.h"

static int __verbose = 0;

#define UC_DEBUG     3
#define UC_DEBUG_STR "UC"

void
UC_set_verbose (void)
{
  __verbose++;
}

#define UC_REPLACEMENT_CHAR 0x0000FFFDL

#define UC_SUR_SHIFT      10
#define UC_SUR_MASK       0x3FFUL
#define UC_SUR_LOW_START  0xDC00UL
#define UC_SUR_HIGH_START 0xD800UL

int
UC_sput_UTF16BE (long ucv, unsigned char **pp, unsigned char *limptr)
{
  int count = 0;
  unsigned char *p = *pp;

  if (ucv >= 0 && ucv <= 0xFFFF) {
    if (p + 2 >= limptr)
      ERROR("Not enough space available...");
    p[0] = (ucv >> 8) & 0xff;
    p[1] = ucv & 0xff;
    count = 2;
  } else if (ucv >= 0x010000L && ucv <= 0x10FFFFL) {
    unsigned short high, low;

    if (p + 4 >= limptr)
      ERROR("Not enough space available...");
    ucv  -= 0x00010000L;
    high = (ucv >> UC_SUR_SHIFT) + UC_SUR_HIGH_START;
    low  = (ucv &  UC_SUR_MASK)  + UC_SUR_LOW_START;
    p[0] = (high >> 8) & 0xff;
    p[1] = (high & 0xff);
    p[2] = (low >> 8) & 0xff;
    p[3] = (low & 0xff);
    count = 4;
  } else {
    if (p + 2 >= limptr)
      ERROR("Not enough space available...");
    p[0] = (UC_REPLACEMENT_CHAR >> 8) & 0xff;
    p[1] = (UC_REPLACEMENT_CHAR & 0xff);
    count = 2;
  }

  *pp += count;
  return count;
}

int
UC_is_valid (long ucv)
{
  if (ucv < 0 || (ucv >= 0x0000D800L && ucv <= 0x0000DFFFL))
    return 0;
  return 1;
}

int32_t
UC_UTF8_decode_char (const unsigned char **pp, const unsigned char *endptr)
{
  const unsigned char *p = *pp;
  int32_t  ucv;
  unsigned char c = *p++;
  int      nbytes;

  if (c <= 0x7f) {
    ucv    = c;
    nbytes = 0;
  } else if ((c & 0xe0) == 0xc0) { /* 110x xxxx */
    ucv    = c & 31;
    nbytes = 1;
  } else if ((c & 0xf0) == 0xe0) { /* 1110 xxxx */
    ucv    = c & 0x0f;
    nbytes = 2;
  } else if ((c & 0xf8) == 0xf0) { /* 1111 0xxx */
    ucv    = c & 0x07;
    nbytes = 3;
  } else if ((c & 0xfc) == 0xf8) { /* 1111 10xx */
    ucv    = c & 0x03;
    nbytes = 4;
  } else if ((c & 0xfe) == 0xfc) { /* 1111 110x */
    ucv    = c & 0x01;
    nbytes = 5;
  } else {
    return -1;
  }
  if (p + nbytes > endptr)
    return -1;
  while (nbytes-- > 0) {
    c = *p++;
    if ((c & 0xc0) != 0x80)
      return -1;
    ucv = (ucv << 6) | (c & 0x3f);
  }

  *pp = p;
  return ucv;
}