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conv.c

#include "wc.h"
#include "wtf.h"
#include "iso2022.h"
#include "hz.h"
#ifdef USE_UNICODE
#include "ucs.h"
#include "utf8.h"
#include "utf7.h"
#endif

char *WcReplace = "?";
char *WcReplaceW = "??";

static Str wc_conv_to_ces(Str is, wc_ces ces);

Str
wc_Str_conv(Str is, wc_ces f_ces, wc_ces t_ces)
{
    if (f_ces != WC_CES_WTF)
      is = (*WcCesInfo[WC_CES_INDEX(f_ces)].conv_from)(is, f_ces);
    if (t_ces != WC_CES_WTF)
      return wc_conv_to_ces(is, t_ces);
    else
      return is;
}

Str
wc_Str_conv_strict(Str is, wc_ces f_ces, wc_ces t_ces)
{
    Str os;
    wc_option opt = WcOption;

    WcOption.strict_iso2022 = WC_TRUE;
    WcOption.no_replace = WC_TRUE;
    WcOption.fix_width_conv = WC_FALSE;
    os = wc_Str_conv(is, f_ces, t_ces);
    WcOption = opt;
    return os;
}

static Str
wc_conv_to_ces(Str is, wc_ces ces)
{
    Str os;
    wc_uchar *sp = (wc_uchar *)is->ptr;
    wc_uchar *ep = sp + is->length;
    wc_uchar *p;
    wc_status st;

    switch (ces) {
    case WC_CES_HZ_GB_2312:
      for (p = sp; p < ep && *p != '~' && *p < 0x80; p++)
          ;
      break;
    case WC_CES_TCVN_5712:
    case WC_CES_VISCII_11:
    case WC_CES_VPS:
      for (p = sp; p < ep && 0x20 <= *p && *p < 0x80; p++)
          ;
      break;
    default:
      for (p = sp; p < ep && *p < 0x80; p++)
          ;
      break;
    }
    if (p == ep)
      return is;

    os = Strnew_size(is->length);
    if (p > sp)
      p--;  /* for precompose */
    if (p > sp)
      Strcat_charp_n(os, is->ptr, (int)(p - sp));

    wc_output_init(ces, &st);

    switch (ces) {
    case WC_CES_ISO_2022_JP:
    case WC_CES_ISO_2022_JP_2:
    case WC_CES_ISO_2022_JP_3:
    case WC_CES_ISO_2022_CN:
    case WC_CES_ISO_2022_KR:
    case WC_CES_HZ_GB_2312:
    case WC_CES_TCVN_5712:
    case WC_CES_VISCII_11:
    case WC_CES_VPS:
#ifdef USE_UNICODE
    case WC_CES_UTF_8:
    case WC_CES_UTF_7:
#endif
      while (p < ep)
          (*st.ces_info->push_to)(os, wtf_parse(&p), &st);
      break;
    default:
      while (p < ep) {
          if (*p < 0x80 && wtf_width(p + 1)) {
            Strcat_char(os, (char)*p);
            p++;
          } else
            (*st.ces_info->push_to)(os, wtf_parse(&p), &st);
      }
      break;
    }

    wc_push_end(os, &st);

    return os;
}

Str
wc_Str_conv_with_detect(Str is, wc_ces *f_ces, wc_ces hint, wc_ces t_ces)
{
    wc_ces detect;

    if (*f_ces == WC_CES_WTF || hint == WC_CES_WTF) {
      *f_ces = WC_CES_WTF;
      detect = WC_CES_WTF;
    } else if (WcOption.auto_detect == WC_OPT_DETECT_OFF) {
      *f_ces = hint;
      detect = hint;
    } else {
      if (*f_ces & WC_CES_T_8BIT)
          hint = *f_ces;
      detect = wc_auto_detect(is->ptr, is->length, hint);
      if (WcOption.auto_detect == WC_OPT_DETECT_ON) {
          if ((detect & WC_CES_T_8BIT) ||
            ((detect & WC_CES_T_NASCII) && ! (*f_ces & WC_CES_T_8BIT)))
            *f_ces = detect;
      } else {
          if ((detect & WC_CES_T_ISO_2022) && ! (*f_ces & WC_CES_T_8BIT))
            *f_ces = detect;
      }
    }
    return wc_Str_conv(is, detect, t_ces);
}

void
wc_push_end(Str os, wc_status *st)
{
    if (st->ces_info->id & WC_CES_T_ISO_2022)
      wc_push_to_iso2022_end(os, st);
    else if (st->ces_info->id == WC_CES_HZ_GB_2312)
      wc_push_to_hz_end(os, st);
#ifdef USE_UNICODE
    else if (st->ces_info->id == WC_CES_UTF_8)
      wc_push_to_utf8_end(os, st);
    else if (st->ces_info->id == WC_CES_UTF_7)
      wc_push_to_utf7_end(os, st);
#endif
}


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