gdkanji.c

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/* gdkanji.c (Kanji code converter)                            */
/*                 written by Masahito Yamaga (ma@yama-ga.com) */
 
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "gd.h"
#include "gdhelpers.h"
 
#include <stdarg.h>
#if defined(HAVE_ICONV_H) || defined(HAVE_ICONV)
#include <iconv.h>
#include <errno.h>
#endif
 
#if defined(HAVE_ICONV_H) && !defined(HAVE_ICONV)
#define HAVE_ICONV 1
#endif
 
#define LIBNAME "any2eucjp()"
 
#if defined(__MSC__) || defined(__BORLANDC__) || defined(__TURBOC__) || defined(_Windows) || defined(MSDOS)
#ifndef SJISPRE
#define SJISPRE 1
#endif
#endif
 
#ifdef TRUE
#undef TRUE
#endif
#ifdef FALSE
#undef FALSE
#endif
 
#define TRUE  1
#define FALSE 0
 
#define NEW 1
#define OLD 2
#define ESCI 3
#define NEC 4
#define EUC 5
#define SJIS 6
#define EUCORSJIS 7
#define ASCII 8
 
#define NEWJISSTR "JIS7"
#define OLDJISSTR "jis"
#define EUCSTR    "eucJP"
#define SJISSTR   "SJIS"
 
#define ESC 27
#define SS2 142
 
static void
debug (const char *format,...)
{
#ifdef DEBUG
  va_list args;
 
  va_start (args, format);
  fprintf (stdout, "%s: ", LIBNAME);
  vfprintf (stdout, format, args);
  fprintf (stdout, "\n");
  va_end (args);
#endif
}
 
static void
error (const char *format,...)
{
    va_list args;
    char *tmp;
 
    va_start(args, format);
    vspprintf(&tmp, 0, format, args);
    va_end(args);
    php_error_docref(NULL, E_WARNING, "%s: %s", LIBNAME, tmp);
    efree(tmp);
}
 
/* DetectKanjiCode() derived from DetectCodeType() by Ken Lunde. */
 
static int
DetectKanjiCode (unsigned char *str)
{
  static int whatcode = ASCII;
  int oldcode = ASCII;
  int c, i;
  char *lang = NULL;
 
  c = '\1';
  i = 0;
 
  if (whatcode != EUCORSJIS && whatcode != ASCII)
    {
      oldcode = whatcode;
      whatcode = ASCII;
    }
 
  while ((whatcode == EUCORSJIS || whatcode == ASCII) && c != '\0')
    {
      if ((c = str[i++]) != '\0')
    {
      if (c == ESC)
        {
          c = str[i++];
          if (c == '$')
        {
          c = str[i++];
          if (c == 'B')
            whatcode = NEW;
          else if (c == '@')
            whatcode = OLD;
        }
          else if (c == '(')
        {
          c = str[i++];
          if (c == 'I')
            whatcode = ESCI;
        }
          else if (c == 'K')
        whatcode = NEC;
        }
      else if ((c >= 129 && c <= 141) || (c >= 143 && c <= 159))
        whatcode = SJIS;
      else if (c == SS2)
        {
          c = str[i++];
          if ((c >= 64 && c <= 126) || (c >= 128 && c <= 160) || (c >= 224 && c <= 252))
        whatcode = SJIS;
          else if (c >= 161 && c <= 223)
        whatcode = EUCORSJIS;
        }
      else if (c >= 161 && c <= 223)
        {
          c = str[i++];
          if (c >= 240 && c <= 254)
        whatcode = EUC;
          else if (c >= 161 && c <= 223)
        whatcode = EUCORSJIS;
          else if (c >= 224 && c <= 239)
        {
          whatcode = EUCORSJIS;
          while (c >= 64 && whatcode == EUCORSJIS)
            {
              if (c >= 129)
            {
              if (c <= 141 || (c >= 143 && c <= 159))
                whatcode = SJIS;
              else if (c >= 253 && c <= 254)
                whatcode = EUC;
            }
              c = str[i++];
            }
        }
          else if (c <= 159)
        whatcode = SJIS;
        }
      else if (c >= 240 && c <= 254)
        whatcode = EUC;
      else if (c >= 224 && c <= 239)
        {
          c = str[i++];
          if ((c >= 64 && c <= 126) || (c >= 128 && c <= 160))
        whatcode = SJIS;
          else if (c >= 253 && c <= 254)
        whatcode = EUC;
          else if (c >= 161 && c <= 252)
        whatcode = EUCORSJIS;
        }
    }
    }
 
#ifdef DEBUG
  if (whatcode == ASCII)
    debug ("Kanji code not included.");
  else if (whatcode == EUCORSJIS)
    debug ("Kanji code not detected.");
  else
    debug ("Kanji code detected at %d byte.", i);
#endif
 
  if (whatcode == EUCORSJIS && oldcode != ASCII)
    whatcode = oldcode;
 
  if (whatcode == EUCORSJIS)
    {
      if (getenv ("LC_ALL"))
    lang = getenv ("LC_ALL");
      else if (getenv ("LC_CTYPE"))
    lang = getenv ("LC_CTYPE");
      else if (getenv ("LANG"))
    lang = getenv ("LANG");
 
      if (lang)
    {
      if (strcmp (lang, "ja_JP.SJIS") == 0 ||
#ifdef hpux
          strcmp (lang, "japanese") == 0 ||
#endif
          strcmp (lang, "ja_JP.mscode") == 0 ||
          strcmp (lang, "ja_JP.PCK") == 0)
        whatcode = SJIS;
      else if (strncmp (lang, "ja", 2) == 0)
#ifdef SJISPRE
        whatcode = SJIS;
#else
        whatcode = EUC;
#endif
    }
    }
 
  if (whatcode == EUCORSJIS)
#ifdef SJISPRE
    whatcode = SJIS;
#else
    whatcode = EUC;
#endif
 
  return whatcode;
}
 
/* SJIStoJIS() is sjis2jis() by Ken Lunde. */
 
static void
SJIStoJIS (int *p1, int *p2)
{
  register unsigned char c1 = *p1;
  register unsigned char c2 = *p2;
  register int adjust = c2 < 159;
  register int rowOffset = c1 < 160 ? 112 : 176;
  register int cellOffset = adjust ? (31 + (c2 > 127)) : 126;
 
  *p1 = ((c1 - rowOffset) << 1) - adjust;
  *p2 -= cellOffset;
}
 
/* han2zen() was derived from han2zen() written by Ken Lunde. */
 
#define IS_DAKU(c) ((c >= 182 && c <= 196) || (c >= 202 && c <= 206) || (c == 179))
#define IS_HANDAKU(c) (c >= 202 && c <= 206)
 
static void
han2zen (int *p1, int *p2)
{
  int c = *p1;
  int daku = FALSE;
  int handaku = FALSE;
  int mtable[][2] =
  {
    {129, 66},
    {129, 117},
    {129, 118},
    {129, 65},
    {129, 69},
    {131, 146},
    {131, 64},
    {131, 66},
    {131, 68},
    {131, 70},
    {131, 72},
    {131, 131},
    {131, 133},
    {131, 135},
    {131, 98},
    {129, 91},
    {131, 65},
    {131, 67},
    {131, 69},
    {131, 71},
    {131, 73},
    {131, 74},
    {131, 76},
    {131, 78},
    {131, 80},
    {131, 82},
    {131, 84},
    {131, 86},
    {131, 88},
    {131, 90},
    {131, 92},
    {131, 94},
    {131, 96},
    {131, 99},
    {131, 101},
    {131, 103},
    {131, 105},
    {131, 106},
    {131, 107},
    {131, 108},
    {131, 109},
    {131, 110},
    {131, 113},
    {131, 116},
    {131, 119},
    {131, 122},
    {131, 125},
    {131, 126},
    {131, 128},
    {131, 129},
    {131, 130},
    {131, 132},
    {131, 134},
    {131, 136},
    {131, 137},
    {131, 138},
    {131, 139},
    {131, 140},
    {131, 141},
    {131, 143},
    {131, 147},
    {129, 74},
    {129, 75}
  };
 
  if (*p2 == 222 && IS_DAKU (*p1))
    daku = TRUE;        /* Daku-ten */
  else if (*p2 == 223 && IS_HANDAKU (*p1))
    handaku = TRUE;     /* Han-daku-ten */
 
  *p1 = mtable[c - 161][0];
  *p2 = mtable[c - 161][1];
 
  if (daku)
    {
      if ((*p2 >= 74 && *p2 <= 103) || (*p2 >= 110 && *p2 <= 122))
    (*p2)++;
      else if (*p2 == 131 || *p2 == 69)
    *p2 = 148;
    }
  else if (handaku && *p2 >= 110 && *p2 <= 122)
    (*p2) += 2;
}
 
/* Recast strcpy to handle unsigned chars used below. */
#define ustrcpy(A,B) (strcpy((char*)(A),(const char*)(B)))
 
static void
do_convert (unsigned char *to, unsigned char *from, const char *code)
{
#ifdef HAVE_ICONV
  iconv_t cd;
  size_t from_len, to_len;
 
  if ((cd = iconv_open (EUCSTR, code)) == (iconv_t) - 1)
    {
      error ("iconv_open() error");
      if (errno == EINVAL)
    error ("invalid code specification: \"%s\" or \"%s\"",
           EUCSTR, code);
      strcpy ((char *) to, (const char *) from);
      return;
    }
 
  from_len = strlen ((const char *) from) + 1;
  to_len = BUFSIZ;
 
  if ((int) iconv(cd, (char **) &from, &from_len, (char **) &to, &to_len) == -1)
    {
      if (errno == EINVAL)
    error ("invalid end of input string");
      else if (errno == EILSEQ)
    error ("invalid code in input string");
      else if (errno == E2BIG)
    error ("output buffer overflow at do_convert()");
      else
    error ("something happen");
      strcpy ((char *) to, (const char *) from);
      return;
    }
 
  if (iconv_close (cd) != 0)
    {
      error ("iconv_close() error");
    }
#else
  int p1, p2, i, j;
  int jisx0208 = FALSE;
  int hankaku = FALSE;
 
  j = 0;
  if (strcmp (code, NEWJISSTR) == 0 || strcmp (code, OLDJISSTR) == 0)
    {
      for (i = 0; from[i] != '\0' && j < BUFSIZ; i++)
    {
      if (from[i] == ESC)
        {
          i++;
          if (from[i] == '$')
        {
          jisx0208 = TRUE;
          hankaku = FALSE;
          i++;
        }
          else if (from[i] == '(')
        {
          jisx0208 = FALSE;
          i++;
          if (from[i] == 'I')   /* Hankaku Kana */
            hankaku = TRUE;
          else
            hankaku = FALSE;
        }
        }
      else
        {
          if (jisx0208)
        to[j++] = from[i] + 128;
          else if (hankaku)
        {
          to[j++] = SS2;
          to[j++] = from[i] + 128;
        }
          else
        to[j++] = from[i];
        }
    }
    }
  else if (strcmp (code, SJISSTR) == 0)
    {
      for (i = 0; from[i] != '\0' && j < BUFSIZ; i++)
    {
      p1 = from[i];
      if (p1 < 127)
        to[j++] = p1;
      else if ((p1 >= 161) && (p1 <= 223))
        {           /* Hankaku Kana */
          to[j++] = SS2;
          to[j++] = p1;
        }
      else
        {
          p2 = from[++i];
          SJIStoJIS (&p1, &p2);
          to[j++] = p1 + 128;
          to[j++] = p2 + 128;
        }
    }
    }
  else
    {
      error ("invalid code specification: \"%s\"", code);
      return;
    }
 
  if (j >= BUFSIZ)
    {
      error ("output buffer overflow at do_convert()");
      ustrcpy (to, from);
    }
  else
    to[j] = '\0';
#endif /* HAVE_ICONV */
}
 
static int
do_check_and_conv (unsigned char *to, unsigned char *from)
{
  static unsigned char tmp[BUFSIZ];
  int p1, p2, i, j;
  int kanji = TRUE;
 
  switch (DetectKanjiCode (from))
    {
    case NEW:
      debug ("Kanji code is New JIS.");
      do_convert (tmp, from, NEWJISSTR);
      break;
    case OLD:
      debug ("Kanji code is Old JIS.");
      do_convert (tmp, from, OLDJISSTR);
      break;
    case ESCI:
      debug ("This string includes Hankaku-Kana (jisx0201) escape sequence [ESC] + ( + I.");
      do_convert (tmp, from, NEWJISSTR);
      break;
    case NEC:
      debug ("Kanji code is NEC Kanji.");
      error ("cannot convert NEC Kanji.");
      ustrcpy (tmp, from);
      kanji = FALSE;
      break;
    case EUC:
      debug ("Kanji code is EUC.");
      ustrcpy (tmp, from);
      break;
    case SJIS:
      debug ("Kanji code is SJIS.");
      do_convert (tmp, from, SJISSTR);
      break;
    case EUCORSJIS:
      debug ("Kanji code is EUC or SJIS.");
      ustrcpy (tmp, from);
      kanji = FALSE;
      break;
    case ASCII:
      debug ("This is ASCII string.");
      ustrcpy (tmp, from);
      kanji = FALSE;
      break;
    default:
      debug ("This string includes unknown code.");
      ustrcpy (tmp, from);
      kanji = FALSE;
      break;
    }
 
  /* Hankaku Kana ---> Zenkaku Kana */
  if (kanji)
    {
      j = 0;
      for (i = 0; tmp[i] != '\0' && j < BUFSIZ; i++)
    {
      if (tmp[i] == SS2)
        {
          p1 = tmp[++i];
          if (tmp[i + 1] == SS2)
        {
          p2 = tmp[i + 2];
          if (p2 == 222 || p2 == 223)
            i += 2;
          else
            p2 = 0;
        }
          else
        p2 = 0;
          han2zen (&p1, &p2);
          SJIStoJIS (&p1, &p2);
          to[j++] = p1 + 128;
          to[j++] = p2 + 128;
        }
      else
        to[j++] = tmp[i];
    }
 
      if (j >= BUFSIZ)
    {
      error ("output buffer overflow at Hankaku --> Zenkaku");
      ustrcpy (to, tmp);
    }
      else
    to[j] = '\0';
    }
  else
    ustrcpy (to, tmp);
 
  return kanji;
}
 
int
any2eucjp (unsigned char *dest, unsigned char *src, unsigned int dest_max)
{
  static unsigned char tmp_dest[BUFSIZ];
  int ret;
 
  if (strlen ((const char *) src) >= BUFSIZ)
    {
      error ("input string too large");
      return -1;
    }
  if (dest_max > BUFSIZ)
    {
      error ("invalid maximum size of destination\nit should be less than %d.", BUFSIZ);
      return -1;
    }
  ret = do_check_and_conv (tmp_dest, src);
  if (strlen ((const char *) tmp_dest) >= dest_max)
    {
      error ("output buffer overflow");
      ustrcpy (dest, src);
      return -1;
    }
  ustrcpy (dest, tmp_dest);
  return ret;
}
 
#if 0
unsigned int
strwidth (unsigned char *s)
{
  unsigned char *t;
  unsigned int i;
 
  t = (unsigned char *) gdMalloc (BUFSIZ);
  any2eucjp (t, s, BUFSIZ);
  i = strlen (t);
  gdFree (t);
  return i;
}
 
#ifdef DEBUG
int
main ()
{
  unsigned char input[BUFSIZ];
  unsigned char *output;
  unsigned char *str;
  int c, i = 0;
 
  while ((c = fgetc (stdin)) != '\n' && i < BUFSIZ)
    input[i++] = c;
  input[i] = '\0';
 
  printf ("input : %d bytes\n", strlen ((const char *) input));
  printf ("output: %d bytes\n", strwidth (input));
 
  output = (unsigned char *) gdMalloc (BUFSIZ);
  any2eucjp (output, input, BUFSIZ);
  str = output;
  while (*str != '\0')
    putchar (*(str++));
  putchar ('\n');
  gdFree (output);
 
  return 0;
}
#endif
#endif