src/util/string.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU Lesser General Public License as published by
   7 the Free Software Foundation; either version 2.1 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU Lesser General Public License for more details.
  14
  15 You should have received a copy of the GNU Lesser General Public License along
  16 with this program; if not, write to the Free Software Foundation, Inc.,
  17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20 #include "string.h"
  21 #include "pointer.h"
  22 #include "numeric.h"
  23 #include "log.h"
  24
  25 #include "hex.h"
  26 #include "../porting.h"
  27
  28 #include <sstream>
  29 #include <iomanip>
  30 #include <map>
  31
  32 #ifndef _WIN32
  33         #include <iconv.h>
  34 #else
  35         #define _WIN32_WINNT 0x0501
  36         #include <windows.h>
  37 #endif
  38
  39 #if defined(_ICONV_H_) && (defined(__FreeBSD__) || defined(__NetBSD__) || \
  40         defined(__OpenBSD__) || defined(__DragonFly__))
  41         #define BSD_ICONV_USED
  42 #endif
  43
  44 static bool parseHexColorString(const std::string &value, video::SColor &color);
  45 static bool parseNamedColorString(const std::string &value, video::SColor &color);
  46
  47 #ifndef _WIN32
  48
  49 bool convert(const char *to, const char *from, char *outbuf,
  50                 size_t outbuf_size, char *inbuf, size_t inbuf_size)
  51 {
  52         iconv_t cd = iconv_open(to, from);
  53
  54 #ifdef BSD_ICONV_USED
  55         const char *inbuf_ptr = inbuf;
  56 #else
  57         char *inbuf_ptr = inbuf;
  58 #endif
  59
  60         char *outbuf_ptr = outbuf;
  61
  62         size_t *inbuf_left_ptr = &inbuf_size;
  63         size_t *outbuf_left_ptr = &outbuf_size;
  64
  65         size_t old_size = inbuf_size;
  66         while (inbuf_size > 0) {
  67                 iconv(cd, &inbuf_ptr, inbuf_left_ptr, &outbuf_ptr, outbuf_left_ptr);
  68                 if (inbuf_size == old_size) {
  69                         iconv_close(cd);
  70                         return false;
  71                 }
  72                 old_size = inbuf_size;
  73         }
  74
  75         iconv_close(cd);
  76         return true;
  77 }
  78
  79 std::wstring utf8_to_wide(const std::string &input)
  80 {
  81         size_t inbuf_size = input.length() + 1;
  82         // maximum possible size, every character is sizeof(wchar_t) bytes
  83         size_t outbuf_size = (input.length() + 1) * sizeof(wchar_t);
  84
  85         char *inbuf = new char[inbuf_size];
  86         memcpy(inbuf, input.c_str(), inbuf_size);
  87         char *outbuf = new char[outbuf_size];
  88         memset(outbuf, 0, outbuf_size);
  89
  90         if (!convert("WCHAR_T", "UTF-8", outbuf, outbuf_size, inbuf, inbuf_size)) {
  91                 infostream << "Couldn't convert UTF-8 string 0x" << hex_encode(input)
  92                         << " into wstring" << std::endl;
  93                 delete[] inbuf;
  94                 delete[] outbuf;
  95                 return L"<invalid UTF-8 string>";
  96         }
  97         std::wstring out((wchar_t *)outbuf);
  98
  99         delete[] inbuf;
 100         delete[] outbuf;
 101
 102         return out;
 103 }
 104
 105 std::string wide_to_utf8(const std::wstring &input)
 106 {
 107         size_t inbuf_size = (input.length() + 1) * sizeof(wchar_t);
 108         // maximum possible size: utf-8 encodes codepoints using 1 up to 6 bytes
 109         size_t outbuf_size = (input.length() + 1) * 6;
 110
 111         char *inbuf = new char[inbuf_size];
 112         memcpy(inbuf, input.c_str(), inbuf_size);
 113         char *outbuf = new char[outbuf_size];
 114         memset(outbuf, 0, outbuf_size);
 115
 116         if (!convert("UTF-8", "WCHAR_T", outbuf, outbuf_size, inbuf, inbuf_size)) {
 117                 infostream << "Couldn't convert wstring 0x" << hex_encode(inbuf, inbuf_size)
 118                         << " into UTF-8 string" << std::endl;
 119                 delete[] inbuf;
 120                 delete[] outbuf;
 121                 return "<invalid wstring>";
 122         }
 123         std::string out(outbuf);
 124
 125         delete[] inbuf;
 126         delete[] outbuf;
 127
 128         return out;
 129 }
 130
 131 #else // _WIN32
 132
 133 std::wstring utf8_to_wide(const std::string &input)
 134 {
 135         size_t outbuf_size = input.size() + 1;
 136         wchar_t *outbuf = new wchar_t[outbuf_size];
 137         memset(outbuf, 0, outbuf_size * sizeof(wchar_t));
 138         MultiByteToWideChar(CP_UTF8, 0, input.c_str(), input.size(),
 139                 outbuf, outbuf_size);
 140         std::wstring out(outbuf);
 141         delete[] outbuf;
 142         return out;
 143 }
 144
 145 std::string wide_to_utf8(const std::wstring &input)
 146 {
 147         size_t outbuf_size = (input.size() + 1) * 6;
 148         char *outbuf = new char[outbuf_size];
 149         memset(outbuf, 0, outbuf_size);
 150         WideCharToMultiByte(CP_UTF8, 0, input.c_str(), input.size(),
 151                 outbuf, outbuf_size, NULL, NULL);
 152         std::string out(outbuf);
 153         delete[] outbuf;
 154         return out;
 155 }
 156
 157 #endif // _WIN32
 158
 159 wchar_t *utf8_to_wide_c(const char *str)
 160 {
 161         std::wstring ret = utf8_to_wide(std::string(str)).c_str();
 162         size_t len = ret.length();
 163         wchar_t *ret_c = new wchar_t[len + 1];
 164         memset(ret_c, 0, (len + 1) * sizeof(wchar_t));
 165         memcpy(ret_c, ret.c_str(), len * sizeof(wchar_t));
 166         return ret_c;
 167 }
 168
 169 // You must free the returned string!
 170 // The returned string is allocated using new
 171 wchar_t *narrow_to_wide_c(const char *str)
 172 {
 173         wchar_t *nstr = NULL;
 174 #if defined(_WIN32)
 175         int nResult = MultiByteToWideChar(CP_UTF8, 0, (LPCSTR) str, -1, 0, 0);
 176         if (nResult == 0) {
 177                 errorstream<<"gettext: MultiByteToWideChar returned null"<<std::endl;
 178         } else {
 179                 nstr = new wchar_t[nResult];
 180                 MultiByteToWideChar(CP_UTF8, 0, (LPCSTR) str, -1, (WCHAR *) nstr, nResult);
 181         }
 182 #else
 183         size_t len = strlen(str);
 184         nstr = new wchar_t[len + 1];
 185
 186         std::wstring intermediate = narrow_to_wide(str);
 187         memset(nstr, 0, (len + 1) * sizeof(wchar_t));
 188         memcpy(nstr, intermediate.c_str(), len * sizeof(wchar_t));
 189 #endif
 190
 191         return nstr;
 192 }
 193
 194
 195 #ifdef __ANDROID__
 196
 197 const wchar_t* wide_chars =
 198         L" !\"#$%&'()*+,-./0123456789:;<=>?@"
 199         L"ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`"
 200         L"abcdefghijklmnopqrstuvwxyz{|}~";
 201
 202 int wctomb(char *s, wchar_t wc)
 203 {
 204         for (unsigned int j = 0; j < (sizeof(wide_chars)/sizeof(wchar_t));j++) {
 205                 if (wc == wide_chars[j]) {
 206                         *s = (char) (j+32);
 207                         return 1;
 208                 }
 209                 else if (wc == L'\n') {
 210                         *s = '\n';
 211                         return 1;
 212                 }
 213         }
 214         return -1;
 215 }
 216
 217 int mbtowc(wchar_t *pwc, const char *s, size_t n)
 218 {
 219         std::wstring intermediate = narrow_to_wide(s);
 220
 221         if (intermediate.length() > 0) {
 222                 *pwc = intermediate[0];
 223                 return 1;
 224         }
 225         else {
 226                 return -1;
 227         }
 228 }
 229
 230 std::wstring narrow_to_wide(const std::string &mbs) {
 231         size_t wcl = mbs.size();
 232
 233         std::wstring retval = L"";
 234
 235         for (unsigned int i = 0; i < wcl; i++) {
 236                 if (((unsigned char) mbs[i] >31) &&
 237                  ((unsigned char) mbs[i] < 127)) {
 238
 239                         retval += wide_chars[(unsigned char) mbs[i] -32];
 240                 }
 241                 //handle newline
 242                 else if (mbs[i] == '\n') {
 243                         retval += L'\n';
 244                 }
 245         }
 246
 247         return retval;
 248 }
 249
 250 #else // not Android
 251
 252 std::wstring narrow_to_wide(const std::string &mbs)
 253 {
 254         size_t wcl = mbs.size();
 255         Buffer<wchar_t> wcs(wcl + 1);
 256         size_t len = mbstowcs(*wcs, mbs.c_str(), wcl);
 257         if (len == (size_t)(-1))
 258                 return L"<invalid multibyte string>";
 259         wcs[len] = 0;
 260         return *wcs;
 261 }
 262
 263 #endif
 264
 265 #ifdef __ANDROID__
 266
 267 std::string wide_to_narrow(const std::wstring &wcs) {
 268         size_t mbl = wcs.size()*4;
 269
 270         std::string retval = "";
 271         for (unsigned int i = 0; i < wcs.size(); i++) {
 272                 wchar_t char1 = (wchar_t) wcs[i];
 273
 274                 if (char1 == L'\n') {
 275                         retval += '\n';
 276                         continue;
 277                 }
 278
 279                 for (unsigned int j = 0; j < wcslen(wide_chars);j++) {
 280                         wchar_t char2 = (wchar_t) wide_chars[j];
 281
 282                         if (char1 == char2) {
 283                                 char toadd = (j+32);
 284                                 retval += toadd;
 285                                 break;
 286                         }
 287                 }
 288         }
 289
 290         return retval;
 291 }
 292
 293 #else // not Android
 294
 295 std::string wide_to_narrow(const std::wstring &wcs)
 296 {
 297         size_t mbl = wcs.size() * 4;
 298         SharedBuffer<char> mbs(mbl+1);
 299         size_t len = wcstombs(*mbs, wcs.c_str(), mbl);
 300         if (len == (size_t)(-1))
 301                 return "Character conversion failed!";
 302         else
 303                 mbs[len] = 0;
 304         return *mbs;
 305 }
 306
 307 #endif
 308
 309 std::string urlencode(std::string str)
 310 {
 311         // Encodes non-unreserved URI characters by a percent sign
 312         // followed by two hex digits. See RFC 3986, section 2.3.
 313         static const char url_hex_chars[] = "0123456789ABCDEF";
 314         std::ostringstream oss(std::ios::binary);
 315         for (u32 i = 0; i < str.size(); i++) {
 316                 unsigned char c = str[i];
 317                 if (isalnum(c) || c == '-' || c == '.' || c == '_' || c == '~')
 318                         oss << c;
 319                 else
 320                         oss << "%"
 321                                 << url_hex_chars[(c & 0xf0) >> 4]
 322                                 << url_hex_chars[c & 0x0f];
 323         }
 324         return oss.str();
 325 }
 326
 327 std::string urldecode(std::string str)
 328 {
 329         // Inverse of urlencode
 330         std::ostringstream oss(std::ios::binary);
 331         for (u32 i = 0; i < str.size(); i++) {
 332                 unsigned char highvalue, lowvalue;
 333                 if (str[i] == '%' &&
 334                                 hex_digit_decode(str[i+1], highvalue) &&
 335                                 hex_digit_decode(str[i+2], lowvalue)) {
 336                         oss << (char) ((highvalue << 4) | lowvalue);
 337                         i += 2;
 338                 }
 339                 else
 340                         oss << str[i];
 341         }
 342         return oss.str();
 343 }
 344
 345 u32 readFlagString(std::string str, const FlagDesc *flagdesc, u32 *flagmask)
 346 {
 347         u32 result = 0, mask = 0;
 348         char *s = &str[0];
 349         char *flagstr, *strpos = NULL;
 350
 351         while ((flagstr = strtok_r(s, ",", &strpos))) {
 352                 s = NULL;
 353
 354                 while (*flagstr == ' ' || *flagstr == '\t')
 355                         flagstr++;
 356
 357                 bool flagset = true;
 358                 if (!strncasecmp(flagstr, "no", 2)) {
 359                         flagset = false;
 360                         flagstr += 2;
 361                 }
 362
 363                 for (int i = 0; flagdesc[i].name; i++) {
 364                         if (!strcasecmp(flagstr, flagdesc[i].name)) {
 365                                 mask |= flagdesc[i].flag;
 366                                 if (flagset)
 367                                         result |= flagdesc[i].flag;
 368                                 break;
 369                         }
 370                 }
 371         }
 372
 373         if (flagmask)
 374                 *flagmask = mask;
 375
 376         return result;
 377 }
 378
 379 std::string writeFlagString(u32 flags, const FlagDesc *flagdesc, u32 flagmask)
 380 {
 381         std::string result;
 382
 383         for (int i = 0; flagdesc[i].name; i++) {
 384                 if (flagmask & flagdesc[i].flag) {
 385                         if (!(flags & flagdesc[i].flag))
 386                                 result += "no";
 387
 388                         result += flagdesc[i].name;
 389                         result += ", ";
 390                 }
 391         }
 392
 393         size_t len = result.length();
 394         if (len >= 2)
 395                 result.erase(len - 2, 2);
 396
 397         return result;
 398 }
 399
 400 size_t mystrlcpy(char *dst, const char *src, size_t size)
 401 {
 402         size_t srclen  = strlen(src) + 1;
 403         size_t copylen = MYMIN(srclen, size);
 404
 405         if (copylen > 0) {
 406                 memcpy(dst, src, copylen);
 407                 dst[copylen - 1] = '\0';
 408         }
 409
 410         return srclen;
 411 }
 412
 413 char *mystrtok_r(char *s, const char *sep, char **lasts)
 414 {
 415         char *t;
 416
 417         if (!s)
 418                 s = *lasts;
 419
 420         while (*s && strchr(sep, *s))
 421                 s++;
 422
 423         if (!*s)
 424                 return NULL;
 425
 426         t = s;
 427         while (*t) {
 428                 if (strchr(sep, *t)) {
 429                         *t++ = '\0';
 430                         break;
 431                 }
 432                 t++;
 433         }
 434
 435         *lasts = t;
 436         return s;
 437 }
 438
 439 u64 read_seed(const char *str)
 440 {
 441         char *endptr;
 442         u64 num;
 443
 444         if (str[0] == '0' && str[1] == 'x')
 445                 num = strtoull(str, &endptr, 16);
 446         else
 447                 num = strtoull(str, &endptr, 10);
 448
 449         if (*endptr)
 450                 num = murmur_hash_64_ua(str, (int)strlen(str), 0x1337);
 451
 452         return num;
 453 }
 454
 455 bool parseColorString(const std::string &value, video::SColor &color, bool quiet)
 456 {
 457         bool success;
 458
 459         if (value[0] == '#')
 460                 success = parseHexColorString(value, color);
 461         else
 462                 success = parseNamedColorString(value, color);
 463
 464         if (!success && !quiet)
 465                 errorstream << "Invalid color: \"" << value << "\"" << std::endl;
 466
 467         return success;
 468 }
 469
 470 static bool parseHexColorString(const std::string &value, video::SColor &color)
 471 {
 472         unsigned char components[] = { 0x00, 0x00, 0x00, 0xff }; // R,G,B,A
 473
 474         if (value[0] != '#')
 475                 return false;
 476
 477         size_t len = value.size();
 478         bool short_form;
 479
 480         if (len == 9 || len == 7) // #RRGGBBAA or #RRGGBB
 481                 short_form = false;
 482         else if (len == 5 || len == 4) // #RGBA or #RGB
 483                 short_form = true;
 484         else
 485                 return false;
 486
 487         bool success = true;
 488
 489         for (size_t pos = 1, cc = 0; pos < len; pos++, cc++) {
 490                 assert(cc < sizeof components / sizeof components[0]);
 491                 if (short_form) {
 492                         unsigned char d;
 493                         if (!hex_digit_decode(value[pos], d)) {
 494                                 success = false;
 495                                 break;
 496                         }
 497                         components[cc] = (d & 0xf) << 4 | (d & 0xf);
 498                 } else {
 499                         unsigned char d1, d2;
 500                         if (!hex_digit_decode(value[pos], d1) ||
 501                                         !hex_digit_decode(value[pos+1], d2)) {
 502                                 success = false;
 503                                 break;
 504                         }
 505                         components[cc] = (d1 & 0xf) << 4 | (d2 & 0xf);
 506                         pos++;  // skip the second digit -- it's already used
 507                 }
 508         }
 509
 510         if (success) {
 511                 color.setRed(components[0]);
 512                 color.setGreen(components[1]);
 513                 color.setBlue(components[2]);
 514                 color.setAlpha(components[3]);
 515         }
 516
 517         return success;
 518 }
 519
 520 struct ColorContainer {
 521         ColorContainer();
 522         std::map<const std::string, u32> colors;
 523 };
 524
 525 ColorContainer::ColorContainer()
 526 {
 527         colors["aliceblue"]              = 0xf0f8ff;
 528         colors["antiquewhite"]           = 0xfaebd7;
 529         colors["aqua"]                   = 0x00ffff;
 530         colors["aquamarine"]             = 0x7fffd4;
 531         colors["azure"]                  = 0xf0ffff;
 532         colors["beige"]                  = 0xf5f5dc;
 533         colors["bisque"]                 = 0xffe4c4;
 534         colors["black"]                  = 00000000;
 535         colors["blanchedalmond"]         = 0xffebcd;
 536         colors["blue"]                   = 0x0000ff;
 537         colors["blueviolet"]             = 0x8a2be2;
 538         colors["brown"]                  = 0xa52a2a;
 539         colors["burlywood"]              = 0xdeb887;
 540         colors["cadetblue"]              = 0x5f9ea0;
 541         colors["chartreuse"]             = 0x7fff00;
 542         colors["chocolate"]              = 0xd2691e;
 543         colors["coral"]                  = 0xff7f50;
 544         colors["cornflowerblue"]         = 0x6495ed;
 545         colors["cornsilk"]               = 0xfff8dc;
 546         colors["crimson"]                = 0xdc143c;
 547         colors["cyan"]                   = 0x00ffff;
 548         colors["darkblue"]               = 0x00008b;
 549         colors["darkcyan"]               = 0x008b8b;
 550         colors["darkgoldenrod"]          = 0xb8860b;
 551         colors["darkgray"]               = 0xa9a9a9;
 552         colors["darkgreen"]              = 0x006400;
 553         colors["darkkhaki"]              = 0xbdb76b;
 554         colors["darkmagenta"]            = 0x8b008b;
 555         colors["darkolivegreen"]         = 0x556b2f;
 556         colors["darkorange"]             = 0xff8c00;
 557         colors["darkorchid"]             = 0x9932cc;
 558         colors["darkred"]                = 0x8b0000;
 559         colors["darksalmon"]             = 0xe9967a;
 560         colors["darkseagreen"]           = 0x8fbc8f;
 561         colors["darkslateblue"]          = 0x483d8b;
 562         colors["darkslategray"]          = 0x2f4f4f;
 563         colors["darkturquoise"]          = 0x00ced1;
 564         colors["darkviolet"]             = 0x9400d3;
 565         colors["deeppink"]               = 0xff1493;
 566         colors["deepskyblue"]            = 0x00bfff;
 567         colors["dimgray"]                = 0x696969;
 568         colors["dodgerblue"]             = 0x1e90ff;
 569         colors["firebrick"]              = 0xb22222;
 570         colors["floralwhite"]            = 0xfffaf0;
 571         colors["forestgreen"]            = 0x228b22;
 572         colors["fuchsia"]                = 0xff00ff;
 573         colors["gainsboro"]              = 0xdcdcdc;
 574         colors["ghostwhite"]             = 0xf8f8ff;
 575         colors["gold"]                   = 0xffd700;
 576         colors["goldenrod"]              = 0xdaa520;
 577         colors["gray"]                   = 0x808080;
 578         colors["green"]                  = 0x008000;
 579         colors["greenyellow"]            = 0xadff2f;
 580         colors["honeydew"]               = 0xf0fff0;
 581         colors["hotpink"]                = 0xff69b4;
 582         colors["indianred "]             = 0xcd5c5c;
 583         colors["indigo "]                = 0x4b0082;
 584         colors["ivory"]                  = 0xfffff0;
 585         colors["khaki"]                  = 0xf0e68c;
 586         colors["lavender"]               = 0xe6e6fa;
 587         colors["lavenderblush"]          = 0xfff0f5;
 588         colors["lawngreen"]              = 0x7cfc00;
 589         colors["lemonchiffon"]           = 0xfffacd;
 590         colors["lightblue"]              = 0xadd8e6;
 591         colors["lightcoral"]             = 0xf08080;
 592         colors["lightcyan"]              = 0xe0ffff;
 593         colors["lightgoldenrodyellow"]   = 0xfafad2;
 594         colors["lightgray"]              = 0xd3d3d3;
 595         colors["lightgreen"]             = 0x90ee90;
 596         colors["lightpink"]              = 0xffb6c1;
 597         colors["lightsalmon"]            = 0xffa07a;
 598         colors["lightseagreen"]          = 0x20b2aa;
 599         colors["lightskyblue"]           = 0x87cefa;
 600         colors["lightslategray"]         = 0x778899;
 601         colors["lightsteelblue"]         = 0xb0c4de;
 602         colors["lightyellow"]            = 0xffffe0;
 603         colors["lime"]                   = 0x00ff00;
 604         colors["limegreen"]              = 0x32cd32;
 605         colors["linen"]                  = 0xfaf0e6;
 606         colors["magenta"]                = 0xff00ff;
 607         colors["maroon"]                 = 0x800000;
 608         colors["mediumaquamarine"]       = 0x66cdaa;
 609         colors["mediumblue"]             = 0x0000cd;
 610         colors["mediumorchid"]           = 0xba55d3;
 611         colors["mediumpurple"]           = 0x9370db;
 612         colors["mediumseagreen"]         = 0x3cb371;
 613         colors["mediumslateblue"]        = 0x7b68ee;
 614         colors["mediumspringgreen"]      = 0x00fa9a;
 615         colors["mediumturquoise"]        = 0x48d1cc;
 616         colors["mediumvioletred"]        = 0xc71585;
 617         colors["midnightblue"]           = 0x191970;
 618         colors["mintcream"]              = 0xf5fffa;
 619         colors["mistyrose"]              = 0xffe4e1;
 620         colors["moccasin"]               = 0xffe4b5;
 621         colors["navajowhite"]            = 0xffdead;
 622         colors["navy"]                   = 0x000080;
 623         colors["oldlace"]                = 0xfdf5e6;
 624         colors["olive"]                  = 0x808000;
 625         colors["olivedrab"]              = 0x6b8e23;
 626         colors["orange"]                 = 0xffa500;
 627         colors["orangered"]              = 0xff4500;
 628         colors["orchid"]                 = 0xda70d6;
 629         colors["palegoldenrod"]          = 0xeee8aa;
 630         colors["palegreen"]              = 0x98fb98;
 631         colors["paleturquoise"]          = 0xafeeee;
 632         colors["palevioletred"]          = 0xdb7093;
 633         colors["papayawhip"]             = 0xffefd5;
 634         colors["peachpuff"]              = 0xffdab9;
 635         colors["peru"]                   = 0xcd853f;
 636         colors["pink"]                   = 0xffc0cb;
 637         colors["plum"]                   = 0xdda0dd;
 638         colors["powderblue"]             = 0xb0e0e6;
 639         colors["purple"]                 = 0x800080;
 640         colors["red"]                    = 0xff0000;
 641         colors["rosybrown"]              = 0xbc8f8f;
 642         colors["royalblue"]              = 0x4169e1;
 643         colors["saddlebrown"]            = 0x8b4513;
 644         colors["salmon"]                 = 0xfa8072;
 645         colors["sandybrown"]             = 0xf4a460;
 646         colors["seagreen"]               = 0x2e8b57;
 647         colors["seashell"]               = 0xfff5ee;
 648         colors["sienna"]                 = 0xa0522d;
 649         colors["silver"]                 = 0xc0c0c0;
 650         colors["skyblue"]                = 0x87ceeb;
 651         colors["slateblue"]              = 0x6a5acd;
 652         colors["slategray"]              = 0x708090;
 653         colors["snow"]                   = 0xfffafa;
 654         colors["springgreen"]            = 0x00ff7f;
 655         colors["steelblue"]              = 0x4682b4;
 656         colors["tan"]                    = 0xd2b48c;
 657         colors["teal"]                   = 0x008080;
 658         colors["thistle"]                = 0xd8bfd8;
 659         colors["tomato"]                 = 0xff6347;
 660         colors["turquoise"]              = 0x40e0d0;
 661         colors["violet"]                 = 0xee82ee;
 662         colors["wheat"]                  = 0xf5deb3;
 663         colors["white"]                  = 0xffffff;
 664         colors["whitesmoke"]             = 0xf5f5f5;
 665         colors["yellow"]                 = 0xffff00;
 666         colors["yellowgreen"]            = 0x9acd32;
 667
 668 }
 669
 670 static const ColorContainer named_colors;
 671
 672 static bool parseNamedColorString(const std::string &value, video::SColor &color)
 673 {
 674         std::string color_name;
 675         std::string alpha_string;
 676
 677         /* If the string has a # in it, assume this is the start of a specified
 678          * alpha value (if it isn't the string is invalid and the error will be
 679          * caught later on, either because the color name won't be found or the
 680          * alpha value will fail conversion)
 681          */
 682         size_t alpha_pos = value.find('#');
 683         if (alpha_pos != std::string::npos) {
 684                 color_name = value.substr(0, alpha_pos);
 685                 alpha_string = value.substr(alpha_pos + 1);
 686         } else {
 687                 color_name = value;
 688         }
 689
 690         color_name = lowercase(value);
 691
 692         std::map<const std::string, unsigned>::const_iterator it;
 693         it = named_colors.colors.find(color_name);
 694         if (it == named_colors.colors.end())
 695                 return false;
 696
 697         u32 color_temp = it->second;
 698
 699         /* An empty string for alpha is ok (none of the color table entries
 700          * have an alpha value either). Color strings without an alpha specified
 701          * are interpreted as fully opaque
 702          *
 703          * For named colors the supplied alpha string (representing a hex value)
 704          * must be exactly two digits. For example:  colorname#08
 705          */
 706         if (!alpha_string.empty()) {
 707                 if (alpha_string.length() != 2)
 708                         return false;
 709
 710                 unsigned char d1, d2;
 711                 if (!hex_digit_decode(alpha_string.at(0), d1)
 712                                 || !hex_digit_decode(alpha_string.at(1), d2))
 713                         return false;
 714                 color_temp |= ((d1 & 0xf) << 4 | (d2 & 0xf)) << 24;
 715         } else {
 716                 color_temp |= 0xff << 24;  // Fully opaque
 717         }
 718
 719         color = video::SColor(color_temp);
 720
 721         return true;
 722 }
 723
 724 void str_replace(std::string &str, char from, char to)
 725 {
 726         std::replace(str.begin(), str.end(), from, to);
 727 }