1. Си / Говнокод #25084

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    while (*str) {
      if (i >= n)
         return NULL;
      if (!(*str & 0x80))
         buffer[i++] = *str++;
      else if ((*str & 0xe0) == 0xc0) {
         if (*str < 0xc2) return NULL;
         c = (*str++ & 0x1f) << 6;
         if ((*str & 0xc0) != 0x80) return NULL;
         buffer[i++] = c + (*str++ & 0x3f);
      } else if ((*str & 0xf0) == 0xe0) {
         if (*str == 0xe0 && (str[1] < 0xa0 || str[1] > 0xbf)) return NULL;
         if (*str == 0xed && str[1] > 0x9f) return NULL; // str[1] < 0x80 is checked below
         c = (*str++ & 0x0f) << 12;
         if ((*str & 0xc0) != 0x80) return NULL;
         c += (*str++ & 0x3f) << 6;
         if ((*str & 0xc0) != 0x80) return NULL;
         buffer[i++] = c + (*str++ & 0x3f);
      } else if ((*str & 0xf8) == 0xf0) {
         if (*str > 0xf4) return NULL;
         if (*str == 0xf0 && (str[1] < 0x90 || str[1] > 0xbf)) return NULL;
         if (*str == 0xf4 && str[1] > 0x8f) return NULL; // str[1] < 0x80 is checked below
         c = (*str++ & 0x07) << 18;
         if ((*str & 0xc0) != 0x80) return NULL;
         c += (*str++ & 0x3f) << 12;
         if ((*str & 0xc0) != 0x80) return NULL;
         c += (*str++ & 0x3f) << 6;
         if ((*str & 0xc0) != 0x80) return NULL;
         c += (*str++ & 0x3f);
         // utf-8 encodings of values used in surrogate pairs are invalid
         if ((c & 0xFFFFF800) == 0xD800) return NULL;
         if (c >= 0x10000) {
            c -= 0x10000;
            if (i + 2 > n) return NULL;
            buffer[i++] = 0xD800 | (0x3ff & (c >> 10));
            buffer[i++] = 0xDC00 | (0x3ff & (c      ));
         }
      } else
         return NULL;
   }

    // Windows stupidly treats 8-bit filenames as some dopey code page,
    // rather than utf-8. If we want to use utf8 filenames, we have to
    // convert them to WCHAR explicitly and call WCHAR versions of the
    // file functions. So, ok, we do.

    Запостил: govnokod3r, 13 Ноября 2018

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