#include <swilib.h>

typedef unsigned int ucs4_t;
typedef unsigned int state_t;
#define RET_SHIFT_ILSEQ(n)  (-1-2*(n))
/* Return code if invalid. (xxx_mbtowc) */
#define RET_ILSEQ           RET_SHIFT_ILSEQ(0)
#define RET_ILUNI      -1
/* Return code if output buffer is too small. (xxx_wctomb, xxx_reset) */
#define RET_TOOSMALL   -2

static const unsigned short cp1251_2uni[128] = {
  /* 0x80 */
  0x0402, 0x0403, 0x201a, 0x0453, 0x201e, 0x2026, 0x2020, 0x2021,
  0x20ac, 0x2030, 0x0409, 0x2039, 0x040a, 0x040c, 0x040b, 0x040f,
  /* 0x90 */
  0x0452, 0x2018, 0x2019, 0x201c, 0x201d, 0x2022, 0x2013, 0x2014,
  0xfffd, 0x2122, 0x0459, 0x203a, 0x045a, 0x045c, 0x045b, 0x045f,
  /* 0xa0 */
  0x00a0, 0x040e, 0x045e, 0x0408, 0x00a4, 0x0490, 0x00a6, 0x00a7,
  0x0401, 0x00a9, 0x0404, 0x00ab, 0x00ac, 0x00ad, 0x00ae, 0x0407,
  /* 0xb0 */
  0x00b0, 0x00b1, 0x0406, 0x0456, 0x0491, 0x00b5, 0x00b6, 0x00b7,
  0x0451, 0x2116, 0x0454, 0x00bb, 0x0458, 0x0405, 0x0455, 0x0457,
  /* 0xc0 */
  0x0410, 0x0411, 0x0412, 0x0413, 0x0414, 0x0415, 0x0416, 0x0417,
  0x0418, 0x0419, 0x041a, 0x041b, 0x041c, 0x041d, 0x041e, 0x041f,
  /* 0xd0 */
  0x0420, 0x0421, 0x0422, 0x0423, 0x0424, 0x0425, 0x0426, 0x0427,
  0x0428, 0x0429, 0x042a, 0x042b, 0x042c, 0x042d, 0x042e, 0x042f,
  /* 0xe0 */
  0x0430, 0x0431, 0x0432, 0x0433, 0x0434, 0x0435, 0x0436, 0x0437,
  0x0438, 0x0439, 0x043a, 0x043b, 0x043c, 0x043d, 0x043e, 0x043f,
  /* 0xf0 */
  0x0440, 0x0441, 0x0442, 0x0443, 0x0444, 0x0445, 0x0446, 0x0447,
  0x0448, 0x0449, 0x044a, 0x044b, 0x044c, 0x044d, 0x044e, 0x044f,
};


int cp1251_mbtowc (ucs4_t *pwc, const unsigned char *s)
{
  unsigned char c = *s;
  if (c < 0x80) {
    unsigned short a = c;
    memcpy(pwc, &a, 2);
    return 1;
  }
  else {
    unsigned short wc = cp1251_2uni[c-0x80];
    if (wc != 0xfffd) {
      memcpy(pwc, &wc, 2);
      return 1;
    }
  }
  return RET_ILSEQ;
}


static const unsigned char cp1251_page00[32] = {
  0xa0, 0x00, 0x00, 0x00, 0xa4, 0x00, 0xa6, 0xa7, /* 0xa0-0xa7 */
  0x00, 0xa9, 0x00, 0xab, 0xac, 0xad, 0xae, 0x00, /* 0xa8-0xaf */
  0xb0, 0xb1, 0x00, 0x00, 0x00, 0xb5, 0xb6, 0xb7, /* 0xb0-0xb7 */
  0x00, 0x00, 0x00, 0xbb, 0x00, 0x00, 0x00, 0x00, /* 0xb8-0xbf */
};
static const unsigned char cp1251_page04[152] = {
  0x00, 0xa8, 0x80, 0x81, 0xaa, 0xbd, 0xb2, 0xaf, /* 0x00-0x07 */
  0xa3, 0x8a, 0x8c, 0x8e, 0x8d, 0x00, 0xa1, 0x8f, /* 0x08-0x0f */
  0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, /* 0x10-0x17 */
  0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, /* 0x18-0x1f */
  0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, /* 0x20-0x27 */
  0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, /* 0x28-0x2f */
  0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* 0x30-0x37 */
  0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* 0x38-0x3f */
  0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* 0x40-0x47 */
  0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* 0x48-0x4f */
  0x00, 0xb8, 0x90, 0x83, 0xba, 0xbe, 0xb3, 0xbf, /* 0x50-0x57 */
  0xbc, 0x9a, 0x9c, 0x9e, 0x9d, 0x00, 0xa2, 0x9f, /* 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 */
  0x00, 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 */
  0xa5, 0xb4, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x90-0x97 */
};
static const unsigned char cp1251_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 */
};

int cp1251_wctomb (unsigned char *r, ucs4_t wc)
{
  unsigned char c = 0;
  if (wc < 0x0080) {
    *r = wc;
    return 1;
  }
  else if (wc >= 0x00a0 && wc < 0x00c0)
    c = cp1251_page00[wc-0x00a0];
  else if (wc >= 0x0400 && wc < 0x0498)
    c = cp1251_page04[wc-0x0400];
  else if (wc >= 0x2010 && wc < 0x2040)
    c = cp1251_page20[wc-0x2010];
  else if (wc == 0x20ac)
    c = 0x88;
  else if (wc == 0x2116)
    c = 0xb9;
  else if (wc == 0x2122)
    c = 0x99;
  if (c != 0) {
    *r = c;
    return 1;
  }
  return RET_ILUNI;
}

int uni2ansi(unsigned short *uni, char *ansi, size_t len)
{
	uni++;
	char *b = ansi;
	unsigned char a;
	ucs4_t c;
	while((c=*uni))
	{
		cp1251_wctomb(&a, c);
		*ansi++ = a;
		uni++;
                if((ansi-b)>=len)break;
	}

        *ansi = 0;
	return ansi-b;
}


int ansi2uni(char *ansi, unsigned short *uni, int len)
{
	unsigned short *b = uni;
	unsigned short u=0;
	unsigned char c;
	while((c=*ansi))
	{
		cp1251_mbtowc((ucs4_t*)&u, &c);
		*uni ++ = u;
		ansi++;
		if((uni-b)>=len)break;
	}

        *uni = 0;
	return (uni-b)*2;
}


const char wintranslation[128]=
{
  0x5F,0x5F,0x27,0x5F,0x22,0x3A,0xC5,0xD8,0x5F,0x25,0x5F,0x3C,0x5F,0x5F,0x5F,0x5F,
  0x5F,0x27,0x27,0x22,0x22,0x07,0x2D,0x2D,0x5F,0x54,0x5F,0x3E,0x5F,0x5F,0x5F,0x5F,
  0xFF,0xF6,0xF7,0x5F,0xFD,0x83,0xB3,0x15,0xF0,0x63,0xF2,0x3C,0xBF,0x2D,0x52,0xF4,
  0xF8,0x2B,'I' ,'i' ,0xA3,0xE7,0x14,0xFA,0xF1,0xFC,0xF3,0x3E,0x5F,0x5F,0x5F,0xF5,
  0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,
  0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F,
  0xA0,0xA1,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,
  0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF
};
const unsigned short dos2unicode[128]=
{
  0x0410,0x0411,0x0412,0x0413,0x0414,0x0415,0x0416,0x0417,
  0x0418,0x0419,0x041A,0x041B,0x041C,0x041D,0x041E,0x041F,
  0x0420,0x0421,0x0422,0x0423,0x0424,0x0425,0x0426,0x0427,
  0x0428,0x0429,0x042A,0x042B,0x042C,0x042D,0x042E,0x042F,
  0x0430,0x0431,0x0432,0x0433,0x0434,0x0435,0x0436,0x0437,
  0x0438,0x0439,0x043A,0x043B,0x043C,0x043D,0x043E,0x043F,
  0x002D,0x002D,0x002D,0x00A6,0x002B,0x00A6,0x00A6,0x00AC,
  0x00AC,0x00A6,0x00A6,0x00AC,0x002D,0x002D,0x002D,0x00AC,
  0x004C,0x002B,0x0054,0x002B,0x002D,0x002B,0x00A6,0x00A6,
  0x004C,0x0433,0x00A6,0x0054,0x00A6,0x003D,0x002B,0x00A6,
  0x00A6,0x0054,0x0054,0x004C,0x004C,0x002D,0x0433,0x002B,
  0x002B,0x002D,0x002D,0x002D,0x002D,0x00A6,0x00A6,0x002D,
  0x0440,0x0441,0x0442,0x0443,0x0444,0x0445,0x0446,0x0447,
  0x0448,0x0449,0x044A,0x044B,0x044C,0x044D,0x044E,0x044F,
  0x0401,0x0451,0x0404,0x0454,0x0407,0x0457,0x040E,0x045E,
  0x00B0,0x2022,0x00B7,0x0076,0x2116,0x00A4,0x00A6,0x00A0
};

unsigned int char8to16(int c, int type)
{
  if (c>=128)
  {
    switch(type)
    {
    case 1:
      c=wintranslation[c-128];
      break;
    }

    if (c<128) return(c);
    return(dos2unicode[c-128]);
  }

  return c;
}

void ascii2ws(WSHDR *ws, const char *s)
{
  char c;
  CutWSTR(ws,0);
  while((c=*s++))
  {
    wsAppendChar(ws,char8to16(c,1));
  }
}

int ansi2utf8(const char *src, char *dest)
{
   int maxlen = strlen(src);
   int utf8_len = 0;
   WSHDR * ws_str = AllocWS(maxlen);
   ascii2ws(ws_str, src);
   ws_2utf8(ws_str, dest, &utf8_len, maxlen * 3 + 1);
   FreeWS(ws_str);
   dest[utf8_len] = '\0';
   return utf8_len;
}