QtUnicode.cpp

/*
 * Copyright (C) 2012 Rajendran Thirupugalsamy
 * See LICENSE for full copyright and license information.
 * See COPYING for distribution information.
 */

extern "C" {
#include "putty.h"
}
#include <QTextCodec>
#include <QDebug>

#define CS_QTEXTCODEC 11111111

void *get_text_codec(const char *line_codepage) {
  QTextCodec *codec = NULL;
  if (line_codepage && *line_codepage) {
    qDebug() << __FUNCTION__ << " using line_codepage " << line_codepage;
    codec = QTextCodec::codecForName(line_codepage);
    if (!codec) {
      char codepage[100];
      strncpy(codepage, line_codepage, sizeof(codepage));
      if (strtok(codepage, ":(")) codec = QTextCodec::codecForName(codepage);
    }
  }
  if (!codec) codec = QTextCodec::codecForLocale();
  if (!codec) codec = QTextCodec::codecForUtfText(APPNAME);
  qDebug() << __FUNCTION__ << " using codec " << (codec ? codec->name().constData() : "NULL");
  return codec;
}

void init_ucs(Config *cfg, struct unicode_data *ucsdata) {
  int i;

  /*
   * In the platform-independent parts of the code, font_codepage
   * is used only for system DBCS support - which we don't
   * support at all. So we set this to something which will never
   * be used.
   */
  ucsdata->font_codepage = -1;

  ucsdata->encoder = get_text_codec(cfg->line_codepage);
  if (!ucsdata->encoder) {
    assert(0);
  } else {
    ucsdata->line_codepage = CS_QTEXTCODEC;
    if (!strcmp(cfg->line_codepage, "UTF-8")) ucsdata->line_codepage = CP_UTF8;
  }

  /*
   * Set up unitab_line, by translating each individual character
   * in the line codepage into Unicode.
   */
  for (i = 0; i < 256; i++) {
    char c[1], *p;
    wchar_t wc[1];
    int len;
    c[0] = (char)i;
    p = c;
    len = 1;
    ucsdata->unitab_line[i] = i;
    if (mb_to_wc(ucsdata->line_codepage, 0, c, 1, wc, 1, ucsdata) == 1)
      ucsdata->unitab_line[i] = wc[0];
    else
      ucsdata->unitab_line[i] = 0xFFFD;
  }

  /*
   * Set up unitab_xterm. This is the same as unitab_line except
   * in the line-drawing regions, where it follows the Unicode
   * encoding.
   *
   * (Note that the strange X encoding of line-drawing characters
   * in the bottom 32 glyphs of ISO8859-1 fonts is taken care of
   * by the font encoding, which will spot such a font and act as
   * if it were in a variant encoding of ISO8859-1.)
   */
  for (i = 0; i < 256; i++) {
    static const wchar_t unitab_xterm_std[32] = {
        0x2666, 0x2592, 0x2409, 0x240c, 0x240d, 0x240a, 0x00b0, 0x00b1, 0x2424, 0x240b, 0x2518,
        0x2510, 0x250c, 0x2514, 0x253c, 0x23ba, 0x23bb, 0x2500, 0x23bc, 0x23bd, 0x251c, 0x2524,
        0x2534, 0x252c, 0x2502, 0x2264, 0x2265, 0x03c0, 0x2260, 0x00a3, 0x00b7, 0x0020};
    static const wchar_t unitab_xterm_poorman[33] = L"*#****o~**+++++-----++++|****L. ";

    const wchar_t *ptr;

    if (cfg->vtmode == VT_POORMAN)
      ptr = unitab_xterm_poorman;
    else
      ptr = unitab_xterm_std;

    if (i >= 0x5F && i < 0x7F)
      ucsdata->unitab_xterm[i] = ptr[i & 0x1F];
    else
      ucsdata->unitab_xterm[i] = ucsdata->unitab_line[i];
  }

  /*
   * Set up unitab_scoacs. The SCO Alternate Character Set is
   * simply CP437.
   */
  for (i = 0; i < 256; i++) {
    char c[1], *p;
    int len;
    c[0] = (char)i;
    p = c;
    len = 1;
    ucsdata->unitab_scoacs[i] = i;
    /*if (1 == charset_to_unicode(&p, &len, wc, 1, CS_CP437, NULL, L"", 0))
        ucsdata->unitab_scoacs[i] = wc[0];
    else
        ucsdata->unitab_scoacs[i] = 0xFFFD;*/
  }

  /*
   * Find the control characters in the line codepage. For
   * direct-to-font mode using the D800 hack, we assume 00-1F and
   * 7F are controls, but allow 80-9F through. (It's as good a
   * guess as anything; and my bet is that half the weird fonts
   * used in this way will be IBM or MS code pages anyway.)
   */
  for (i = 0; i < 256; i++) {
    int lineval = ucsdata->unitab_line[i];
    if (lineval < ' ' || (lineval >= 0x7F && lineval < 0xA0) ||
        (lineval >= 0xD800 && lineval < 0xD820) || (lineval == 0xD87F))
      ucsdata->unitab_ctrl[i] = (unsigned char)i;
    else
      ucsdata->unitab_ctrl[i] = 0xFF;
  }

  ucsdata->dbcs_screenfont = 0;
}