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 #ifdef __ANDROID__
 106 // TODO: this is an ugly fix for wide_to_utf8 somehow not working on android
 107 std::string wide_to_utf8(const std::wstring &input)
 108 {
 109         return wide_to_narrow(input);
 110 }
 111 #else
 112 std::string wide_to_utf8(const std::wstring &input)
 113 {
 114         size_t inbuf_size = (input.length() + 1) * sizeof(wchar_t);
 115         // maximum possible size: utf-8 encodes codepoints using 1 up to 6 bytes
 116         size_t outbuf_size = (input.length() + 1) * 6;
 117
 118         char *inbuf = new char[inbuf_size];
 119         memcpy(inbuf, input.c_str(), inbuf_size);
 120         char *outbuf = new char[outbuf_size];
 121         memset(outbuf, 0, outbuf_size);
 122
 123         if (!convert("UTF-8", "WCHAR_T", outbuf, outbuf_size, inbuf, inbuf_size)) {
 124                 infostream << "Couldn't convert wstring 0x" << hex_encode(inbuf, inbuf_size)
 125                         << " into UTF-8 string" << std::endl;
 126                 delete[] inbuf;
 127                 delete[] outbuf;
 128                 return "<invalid wstring>";
 129         }
 130         std::string out(outbuf);
 131
 132         delete[] inbuf;
 133         delete[] outbuf;
 134
 135         return out;
 136 }
 137
 138 #endif
 139 #else // _WIN32
 140
 141 std::wstring utf8_to_wide(const std::string &input)
 142 {
 143         size_t outbuf_size = input.size() + 1;
 144         wchar_t *outbuf = new wchar_t[outbuf_size];
 145         memset(outbuf, 0, outbuf_size * sizeof(wchar_t));
 146         MultiByteToWideChar(CP_UTF8, 0, input.c_str(), input.size(),
 147                 outbuf, outbuf_size);
 148         std::wstring out(outbuf);
 149         delete[] outbuf;
 150         return out;
 151 }
 152
 153 std::string wide_to_utf8(const std::wstring &input)
 154 {
 155         size_t outbuf_size = (input.size() + 1) * 6;
 156         char *outbuf = new char[outbuf_size];
 157         memset(outbuf, 0, outbuf_size);
 158         WideCharToMultiByte(CP_UTF8, 0, input.c_str(), input.size(),
 159                 outbuf, outbuf_size, NULL, NULL);
 160         std::string out(outbuf);
 161         delete[] outbuf;
 162         return out;
 163 }
 164
 165 #endif // _WIN32
 166
 167 wchar_t *utf8_to_wide_c(const char *str)
 168 {
 169         std::wstring ret = utf8_to_wide(std::string(str)).c_str();
 170         size_t len = ret.length();
 171         wchar_t *ret_c = new wchar_t[len + 1];
 172         memset(ret_c, 0, (len + 1) * sizeof(wchar_t));
 173         memcpy(ret_c, ret.c_str(), len * sizeof(wchar_t));
 174         return ret_c;
 175 }
 176
 177 // You must free the returned string!
 178 // The returned string is allocated using new
 179 wchar_t *narrow_to_wide_c(const char *str)
 180 {
 181         wchar_t *nstr = NULL;
 182 #if defined(_WIN32)
 183         int nResult = MultiByteToWideChar(CP_UTF8, 0, (LPCSTR) str, -1, 0, 0);
 184         if (nResult == 0) {
 185                 errorstream<<"gettext: MultiByteToWideChar returned null"<<std::endl;
 186         } else {
 187                 nstr = new wchar_t[nResult];
 188                 MultiByteToWideChar(CP_UTF8, 0, (LPCSTR) str, -1, (WCHAR *) nstr, nResult);
 189         }
 190 #else
 191         size_t len = strlen(str);
 192         nstr = new wchar_t[len + 1];
 193
 194         std::wstring intermediate = narrow_to_wide(str);
 195         memset(nstr, 0, (len + 1) * sizeof(wchar_t));
 196         memcpy(nstr, intermediate.c_str(), len * sizeof(wchar_t));
 197 #endif
 198
 199         return nstr;
 200 }
 201
 202
 203 #ifdef __ANDROID__
 204
 205 const wchar_t* wide_chars =
 206         L" !\"#$%&'()*+,-./0123456789:;<=>?@"
 207         L"ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`"
 208         L"abcdefghijklmnopqrstuvwxyz{|}~";
 209
 210 int wctomb(char *s, wchar_t wc)
 211 {
 212         for (unsigned int j = 0; j < (sizeof(wide_chars)/sizeof(wchar_t));j++) {
 213                 if (wc == wide_chars[j]) {
 214                         *s = (char) (j+32);
 215                         return 1;
 216                 }
 217                 else if (wc == L'\n') {
 218                         *s = '\n';
 219                         return 1;
 220                 }
 221         }
 222         return -1;
 223 }
 224
 225 int mbtowc(wchar_t *pwc, const char *s, size_t n)
 226 {
 227         std::wstring intermediate = narrow_to_wide(s);
 228
 229         if (intermediate.length() > 0) {
 230                 *pwc = intermediate[0];
 231                 return 1;
 232         }
 233         else {
 234                 return -1;
 235         }
 236 }
 237
 238 std::wstring narrow_to_wide(const std::string &mbs) {
 239         size_t wcl = mbs.size();
 240
 241         std::wstring retval = L"";
 242
 243         for (unsigned int i = 0; i < wcl; i++) {
 244                 if (((unsigned char) mbs[i] >31) &&
 245                  ((unsigned char) mbs[i] < 127)) {
 246
 247                         retval += wide_chars[(unsigned char) mbs[i] -32];
 248                 }
 249                 //handle newline
 250                 else if (mbs[i] == '\n') {
 251                         retval += L'\n';
 252                 }
 253         }
 254
 255         return retval;
 256 }
 257
 258 #else // not Android
 259
 260 std::wstring narrow_to_wide(const std::string &mbs)
 261 {
 262         size_t wcl = mbs.size();
 263         Buffer<wchar_t> wcs(wcl + 1);
 264         size_t len = mbstowcs(*wcs, mbs.c_str(), wcl);
 265         if (len == (size_t)(-1))
 266                 return L"<invalid multibyte string>";
 267         wcs[len] = 0;
 268         return *wcs;
 269 }
 270
 271 #endif
 272
 273 #ifdef __ANDROID__
 274
 275 std::string wide_to_narrow(const std::wstring &wcs) {
 276         size_t mbl = wcs.size()*4;
 277
 278         std::string retval = "";
 279         for (unsigned int i = 0; i < wcs.size(); i++) {
 280                 wchar_t char1 = (wchar_t) wcs[i];
 281
 282                 if (char1 == L'\n') {
 283                         retval += '\n';
 284                         continue;
 285                 }
 286
 287                 for (unsigned int j = 0; j < wcslen(wide_chars);j++) {
 288                         wchar_t char2 = (wchar_t) wide_chars[j];
 289
 290                         if (char1 == char2) {
 291                                 char toadd = (j+32);
 292                                 retval += toadd;
 293                                 break;
 294                         }
 295                 }
 296         }
 297
 298         return retval;
 299 }
 300
 301 #else // not Android
 302
 303 std::string wide_to_narrow(const std::wstring &wcs)
 304 {
 305         size_t mbl = wcs.size() * 4;
 306         SharedBuffer<char> mbs(mbl+1);
 307         size_t len = wcstombs(*mbs, wcs.c_str(), mbl);
 308         if (len == (size_t)(-1))
 309                 return "Character conversion failed!";
 310         else
 311                 mbs[len] = 0;
 312         return *mbs;
 313 }
 314
 315 #endif
 316
 317 std::string urlencode(std::string str)
 318 {
 319         // Encodes non-unreserved URI characters by a percent sign
 320         // followed by two hex digits. See RFC 3986, section 2.3.
 321         static const char url_hex_chars[] = "0123456789ABCDEF";
 322         std::ostringstream oss(std::ios::binary);
 323         for (u32 i = 0; i < str.size(); i++) {
 324                 unsigned char c = str[i];
 325                 if (isalnum(c) || c == '-' || c == '.' || c == '_' || c == '~')
 326                         oss << c;
 327                 else
 328                         oss << "%"
 329                                 << url_hex_chars[(c & 0xf0) >> 4]
 330                                 << url_hex_chars[c & 0x0f];
 331         }
 332         return oss.str();
 333 }
 334
 335 std::string urldecode(std::string str)
 336 {
 337         // Inverse of urlencode
 338         std::ostringstream oss(std::ios::binary);
 339         for (u32 i = 0; i < str.size(); i++) {
 340                 unsigned char highvalue, lowvalue;
 341                 if (str[i] == '%' &&
 342                                 hex_digit_decode(str[i+1], highvalue) &&
 343                                 hex_digit_decode(str[i+2], lowvalue)) {
 344                         oss << (char) ((highvalue << 4) | lowvalue);
 345                         i += 2;
 346                 }
 347                 else
 348                         oss << str[i];
 349         }
 350         return oss.str();
 351 }
 352
 353 u32 readFlagString(std::string str, const FlagDesc *flagdesc, u32 *flagmask)
 354 {
 355         u32 result = 0, mask = 0;
 356         char *s = &str[0];
 357         char *flagstr, *strpos = NULL;
 358
 359         while ((flagstr = strtok_r(s, ",", &strpos))) {
 360                 s = NULL;
 361
 362                 while (*flagstr == ' ' || *flagstr == '\t')
 363                         flagstr++;
 364
 365                 bool flagset = true;
 366                 if (!strncasecmp(flagstr, "no", 2)) {
 367                         flagset = false;
 368                         flagstr += 2;
 369                 }
 370
 371                 for (int i = 0; flagdesc[i].name; i++) {
 372                         if (!strcasecmp(flagstr, flagdesc[i].name)) {
 373                                 mask |= flagdesc[i].flag;
 374                                 if (flagset)
 375                                         result |= flagdesc[i].flag;
 376                                 break;
 377                         }
 378                 }
 379         }
 380
 381         if (flagmask)
 382                 *flagmask = mask;
 383
 384         return result;
 385 }
 386
 387 std::string writeFlagString(u32 flags, const FlagDesc *flagdesc, u32 flagmask)
 388 {
 389         std::string result;
 390
 391         for (int i = 0; flagdesc[i].name; i++) {
 392                 if (flagmask & flagdesc[i].flag) {
 393                         if (!(flags & flagdesc[i].flag))
 394                                 result += "no";
 395
 396                         result += flagdesc[i].name;
 397                         result += ", ";
 398                 }
 399         }
 400
 401         size_t len = result.length();
 402         if (len >= 2)
 403                 result.erase(len - 2, 2);
 404
 405         return result;
 406 }
 407
 408 size_t mystrlcpy(char *dst, const char *src, size_t size)
 409 {
 410         size_t srclen  = strlen(src) + 1;
 411         size_t copylen = MYMIN(srclen, size);
 412
 413         if (copylen > 0) {
 414                 memcpy(dst, src, copylen);
 415                 dst[copylen - 1] = '\0';
 416         }
 417
 418         return srclen;
 419 }
 420
 421 char *mystrtok_r(char *s, const char *sep, char **lasts)
 422 {
 423         char *t;
 424
 425         if (!s)
 426                 s = *lasts;
 427
 428         while (*s && strchr(sep, *s))
 429                 s++;
 430
 431         if (!*s)
 432                 return NULL;
 433
 434         t = s;
 435         while (*t) {
 436                 if (strchr(sep, *t)) {
 437                         *t++ = '\0';
 438                         break;
 439                 }
 440                 t++;
 441         }
 442
 443         *lasts = t;
 444         return s;
 445 }
 446
 447 u64 read_seed(const char *str)
 448 {
 449         char *endptr;
 450         u64 num;
 451
 452         if (str[0] == '0' && str[1] == 'x')
 453                 num = strtoull(str, &endptr, 16);
 454         else
 455                 num = strtoull(str, &endptr, 10);
 456
 457         if (*endptr)
 458                 num = murmur_hash_64_ua(str, (int)strlen(str), 0x1337);
 459
 460         return num;
 461 }
 462
 463 bool parseColorString(const std::string &value, video::SColor &color, bool quiet)
 464 {
 465         bool success;
 466
 467         if (value[0] == '#')
 468                 success = parseHexColorString(value, color);
 469         else
 470                 success = parseNamedColorString(value, color);
 471
 472         if (!success && !quiet)
 473                 errorstream << "Invalid color: \"" << value << "\"" << std::endl;
 474
 475         return success;
 476 }
 477
 478 static bool parseHexColorString(const std::string &value, video::SColor &color)
 479 {
 480         unsigned char components[] = { 0x00, 0x00, 0x00, 0xff }; // R,G,B,A
 481
 482         if (value[0] != '#')
 483                 return false;
 484
 485         size_t len = value.size();
 486         bool short_form;
 487
 488         if (len == 9 || len == 7) // #RRGGBBAA or #RRGGBB
 489                 short_form = false;
 490         else if (len == 5 || len == 4) // #RGBA or #RGB
 491                 short_form = true;
 492         else
 493                 return false;
 494
 495         bool success = true;
 496
 497         for (size_t pos = 1, cc = 0; pos < len; pos++, cc++) {
 498                 assert(cc < sizeof components / sizeof components[0]);
 499                 if (short_form) {
 500                         unsigned char d;
 501                         if (!hex_digit_decode(value[pos], d)) {
 502                                 success = false;
 503                                 break;
 504                         }
 505                         components[cc] = (d & 0xf) << 4 | (d & 0xf);
 506                 } else {
 507                         unsigned char d1, d2;
 508                         if (!hex_digit_decode(value[pos], d1) ||
 509                                         !hex_digit_decode(value[pos+1], d2)) {
 510                                 success = false;
 511                                 break;
 512                         }
 513                         components[cc] = (d1 & 0xf) << 4 | (d2 & 0xf);
 514                         pos++;  // skip the second digit -- it's already used
 515                 }
 516         }
 517
 518         if (success) {
 519                 color.setRed(components[0]);
 520                 color.setGreen(components[1]);
 521                 color.setBlue(components[2]);
 522                 color.setAlpha(components[3]);
 523         }
 524
 525         return success;
 526 }
 527
 528 struct ColorContainer {
 529         ColorContainer();
 530         std::map<const std::string, u32> colors;
 531 };
 532
 533 ColorContainer::ColorContainer()
 534 {
 535         colors["aliceblue"]              = 0xf0f8ff;
 536         colors["antiquewhite"]           = 0xfaebd7;
 537         colors["aqua"]                   = 0x00ffff;
 538         colors["aquamarine"]             = 0x7fffd4;
 539         colors["azure"]                  = 0xf0ffff;
 540         colors["beige"]                  = 0xf5f5dc;
 541         colors["bisque"]                 = 0xffe4c4;
 542         colors["black"]                  = 00000000;
 543         colors["blanchedalmond"]         = 0xffebcd;
 544         colors["blue"]                   = 0x0000ff;
 545         colors["blueviolet"]             = 0x8a2be2;
 546         colors["brown"]                  = 0xa52a2a;
 547         colors["burlywood"]              = 0xdeb887;
 548         colors["cadetblue"]              = 0x5f9ea0;
 549         colors["chartreuse"]             = 0x7fff00;
 550         colors["chocolate"]              = 0xd2691e;
 551         colors["coral"]                  = 0xff7f50;
 552         colors["cornflowerblue"]         = 0x6495ed;
 553         colors["cornsilk"]               = 0xfff8dc;
 554         colors["crimson"]                = 0xdc143c;
 555         colors["cyan"]                   = 0x00ffff;
 556         colors["darkblue"]               = 0x00008b;
 557         colors["darkcyan"]               = 0x008b8b;
 558         colors["darkgoldenrod"]          = 0xb8860b;
 559         colors["darkgray"]               = 0xa9a9a9;
 560         colors["darkgreen"]              = 0x006400;
 561         colors["darkkhaki"]              = 0xbdb76b;
 562         colors["darkmagenta"]            = 0x8b008b;
 563         colors["darkolivegreen"]         = 0x556b2f;
 564         colors["darkorange"]             = 0xff8c00;
 565         colors["darkorchid"]             = 0x9932cc;
 566         colors["darkred"]                = 0x8b0000;
 567         colors["darksalmon"]             = 0xe9967a;
 568         colors["darkseagreen"]           = 0x8fbc8f;
 569         colors["darkslateblue"]          = 0x483d8b;
 570         colors["darkslategray"]          = 0x2f4f4f;
 571         colors["darkturquoise"]          = 0x00ced1;
 572         colors["darkviolet"]             = 0x9400d3;
 573         colors["deeppink"]               = 0xff1493;
 574         colors["deepskyblue"]            = 0x00bfff;
 575         colors["dimgray"]                = 0x696969;
 576         colors["dodgerblue"]             = 0x1e90ff;
 577         colors["firebrick"]              = 0xb22222;
 578         colors["floralwhite"]            = 0xfffaf0;
 579         colors["forestgreen"]            = 0x228b22;
 580         colors["fuchsia"]                = 0xff00ff;
 581         colors["gainsboro"]              = 0xdcdcdc;
 582         colors["ghostwhite"]             = 0xf8f8ff;
 583         colors["gold"]                   = 0xffd700;
 584         colors["goldenrod"]              = 0xdaa520;
 585         colors["gray"]                   = 0x808080;
 586         colors["green"]                  = 0x008000;
 587         colors["greenyellow"]            = 0xadff2f;
 588         colors["honeydew"]               = 0xf0fff0;
 589         colors["hotpink"]                = 0xff69b4;
 590         colors["indianred"]              = 0xcd5c5c;
 591         colors["indigo"]                 = 0x4b0082;
 592         colors["ivory"]                  = 0xfffff0;
 593         colors["khaki"]                  = 0xf0e68c;
 594         colors["lavender"]               = 0xe6e6fa;
 595         colors["lavenderblush"]          = 0xfff0f5;
 596         colors["lawngreen"]              = 0x7cfc00;
 597         colors["lemonchiffon"]           = 0xfffacd;
 598         colors["lightblue"]              = 0xadd8e6;
 599         colors["lightcoral"]             = 0xf08080;
 600         colors["lightcyan"]              = 0xe0ffff;
 601         colors["lightgoldenrodyellow"]   = 0xfafad2;
 602         colors["lightgray"]              = 0xd3d3d3;
 603         colors["lightgreen"]             = 0x90ee90;
 604         colors["lightpink"]              = 0xffb6c1;
 605         colors["lightsalmon"]            = 0xffa07a;
 606         colors["lightseagreen"]          = 0x20b2aa;
 607         colors["lightskyblue"]           = 0x87cefa;
 608         colors["lightslategray"]         = 0x778899;
 609         colors["lightsteelblue"]         = 0xb0c4de;
 610         colors["lightyellow"]            = 0xffffe0;
 611         colors["lime"]                   = 0x00ff00;
 612         colors["limegreen"]              = 0x32cd32;
 613         colors["linen"]                  = 0xfaf0e6;
 614         colors["magenta"]                = 0xff00ff;
 615         colors["maroon"]                 = 0x800000;
 616         colors["mediumaquamarine"]       = 0x66cdaa;
 617         colors["mediumblue"]             = 0x0000cd;
 618         colors["mediumorchid"]           = 0xba55d3;
 619         colors["mediumpurple"]           = 0x9370db;
 620         colors["mediumseagreen"]         = 0x3cb371;
 621         colors["mediumslateblue"]        = 0x7b68ee;
 622         colors["mediumspringgreen"]      = 0x00fa9a;
 623         colors["mediumturquoise"]        = 0x48d1cc;
 624         colors["mediumvioletred"]        = 0xc71585;
 625         colors["midnightblue"]           = 0x191970;
 626         colors["mintcream"]              = 0xf5fffa;
 627         colors["mistyrose"]              = 0xffe4e1;
 628         colors["moccasin"]               = 0xffe4b5;
 629         colors["navajowhite"]            = 0xffdead;
 630         colors["navy"]                   = 0x000080;
 631         colors["oldlace"]                = 0xfdf5e6;
 632         colors["olive"]                  = 0x808000;
 633         colors["olivedrab"]              = 0x6b8e23;
 634         colors["orange"]                 = 0xffa500;
 635         colors["orangered"]              = 0xff4500;
 636         colors["orchid"]                 = 0xda70d6;
 637         colors["palegoldenrod"]          = 0xeee8aa;
 638         colors["palegreen"]              = 0x98fb98;
 639         colors["paleturquoise"]          = 0xafeeee;
 640         colors["palevioletred"]          = 0xdb7093;
 641         colors["papayawhip"]             = 0xffefd5;
 642         colors["peachpuff"]              = 0xffdab9;
 643         colors["peru"]                   = 0xcd853f;
 644         colors["pink"]                   = 0xffc0cb;
 645         colors["plum"]                   = 0xdda0dd;
 646         colors["powderblue"]             = 0xb0e0e6;
 647         colors["purple"]                 = 0x800080;
 648         colors["red"]                    = 0xff0000;
 649         colors["rosybrown"]              = 0xbc8f8f;
 650         colors["royalblue"]              = 0x4169e1;
 651         colors["saddlebrown"]            = 0x8b4513;
 652         colors["salmon"]                 = 0xfa8072;
 653         colors["sandybrown"]             = 0xf4a460;
 654         colors["seagreen"]               = 0x2e8b57;
 655         colors["seashell"]               = 0xfff5ee;
 656         colors["sienna"]                 = 0xa0522d;
 657         colors["silver"]                 = 0xc0c0c0;
 658         colors["skyblue"]                = 0x87ceeb;
 659         colors["slateblue"]              = 0x6a5acd;
 660         colors["slategray"]              = 0x708090;
 661         colors["snow"]                   = 0xfffafa;
 662         colors["springgreen"]            = 0x00ff7f;
 663         colors["steelblue"]              = 0x4682b4;
 664         colors["tan"]                    = 0xd2b48c;
 665         colors["teal"]                   = 0x008080;
 666         colors["thistle"]                = 0xd8bfd8;
 667         colors["tomato"]                 = 0xff6347;
 668         colors["turquoise"]              = 0x40e0d0;
 669         colors["violet"]                 = 0xee82ee;
 670         colors["wheat"]                  = 0xf5deb3;
 671         colors["white"]                  = 0xffffff;
 672         colors["whitesmoke"]             = 0xf5f5f5;
 673         colors["yellow"]                 = 0xffff00;
 674         colors["yellowgreen"]            = 0x9acd32;
 675
 676 }
 677
 678 static const ColorContainer named_colors;
 679
 680 static bool parseNamedColorString(const std::string &value, video::SColor &color)
 681 {
 682         std::string color_name;
 683         std::string alpha_string;
 684
 685         /* If the string has a # in it, assume this is the start of a specified
 686          * alpha value (if it isn't the string is invalid and the error will be
 687          * caught later on, either because the color name won't be found or the
 688          * alpha value will fail conversion)
 689          */
 690         size_t alpha_pos = value.find('#');
 691         if (alpha_pos != std::string::npos) {
 692                 color_name = value.substr(0, alpha_pos);
 693                 alpha_string = value.substr(alpha_pos + 1);
 694         } else {
 695                 color_name = value;
 696         }
 697
 698         color_name = lowercase(value);
 699
 700         std::map<const std::string, unsigned>::const_iterator it;
 701         it = named_colors.colors.find(color_name);
 702         if (it == named_colors.colors.end())
 703                 return false;
 704
 705         u32 color_temp = it->second;
 706
 707         /* An empty string for alpha is ok (none of the color table entries
 708          * have an alpha value either). Color strings without an alpha specified
 709          * are interpreted as fully opaque
 710          *
 711          * For named colors the supplied alpha string (representing a hex value)
 712          * must be exactly two digits. For example:  colorname#08
 713          */
 714         if (!alpha_string.empty()) {
 715                 if (alpha_string.length() != 2)
 716                         return false;
 717
 718                 unsigned char d1, d2;
 719                 if (!hex_digit_decode(alpha_string.at(0), d1)
 720                                 || !hex_digit_decode(alpha_string.at(1), d2))
 721                         return false;
 722                 color_temp |= ((d1 & 0xf) << 4 | (d2 & 0xf)) << 24;
 723         } else {
 724                 color_temp |= 0xff << 24;  // Fully opaque
 725         }
 726
 727         color = video::SColor(color_temp);
 728
 729         return true;
 730 }
 731
 732 void str_replace(std::string &str, char from, char to)
 733 {
 734         std::replace(str.begin(), str.end(), from, to);
 735 }