base/files/file_path.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/files/file_path.h"
   6
   7 #include <string.h>
   8 #include <algorithm>
   9
  10 #include "base/basictypes.h"
  11 #include "base/logging.h"
  12 #include "base/pickle.h"
  13
  14 // These includes are just for the *Hack functions, and should be removed
  15 // when those functions are removed.
  16 #include "base/string_util.h"
  17 #include "base/strings/string_piece.h"
  18 #include "base/strings/sys_string_conversions.h"
  19 #include "base/utf_string_conversions.h"
  20
  21 #if defined(OS_MACOSX)
  22 #include "base/mac/scoped_cftyperef.h"
  23 #include "base/third_party/icu/icu_utf.h"
  24 #endif
  25
  26 #if defined(OS_WIN)
  27 #include <windows.h>
  28 #elif defined(OS_MACOSX)
  29 #include <CoreFoundation/CoreFoundation.h>
  30 #endif
  31
  32 namespace base {
  33
  34 typedef FilePath::StringType StringType;
  35
  36 namespace {
  37
  38 const char* kCommonDoubleExtensionSuffixes[] = { "gz", "z", "bz2" };
  39 const char* kCommonDoubleExtensions[] = { "user.js" };
  40
  41 const FilePath::CharType kStringTerminator = FILE_PATH_LITERAL('\0');
  42
  43 // If this FilePath contains a drive letter specification, returns the
  44 // position of the last character of the drive letter specification,
  45 // otherwise returns npos.  This can only be true on Windows, when a pathname
  46 // begins with a letter followed by a colon.  On other platforms, this always
  47 // returns npos.
  48 StringType::size_type FindDriveLetter(const StringType& path) {
  49 #if defined(FILE_PATH_USES_DRIVE_LETTERS)
  50   // This is dependent on an ASCII-based character set, but that's a
  51   // reasonable assumption.  iswalpha can be too inclusive here.
  52   if (path.length() >= 2 && path[1] == L':' &&
  53       ((path[0] >= L'A' && path[0] <= L'Z') ||
  54        (path[0] >= L'a' && path[0] <= L'z'))) {
  55     return 1;
  56   }
  57 #endif  // FILE_PATH_USES_DRIVE_LETTERS
  58   return StringType::npos;
  59 }
  60
  61 #if defined(FILE_PATH_USES_DRIVE_LETTERS)
  62 bool EqualDriveLetterCaseInsensitive(const StringType& a,
  63                                      const StringType& b) {
  64   size_t a_letter_pos = FindDriveLetter(a);
  65   size_t b_letter_pos = FindDriveLetter(b);
  66
  67   if (a_letter_pos == StringType::npos || b_letter_pos == StringType::npos)
  68     return a == b;
  69
  70   StringType a_letter(a.substr(0, a_letter_pos + 1));
  71   StringType b_letter(b.substr(0, b_letter_pos + 1));
  72   if (!StartsWith(a_letter, b_letter, false))
  73     return false;
  74
  75   StringType a_rest(a.substr(a_letter_pos + 1));
  76   StringType b_rest(b.substr(b_letter_pos + 1));
  77   return a_rest == b_rest;
  78 }
  79 #endif  // defined(FILE_PATH_USES_DRIVE_LETTERS)
  80
  81 bool IsPathAbsolute(const StringType& path) {
  82 #if defined(FILE_PATH_USES_DRIVE_LETTERS)
  83   StringType::size_type letter = FindDriveLetter(path);
  84   if (letter != StringType::npos) {
  85     // Look for a separator right after the drive specification.
  86     return path.length() > letter + 1 &&
  87         FilePath::IsSeparator(path[letter + 1]);
  88   }
  89   // Look for a pair of leading separators.
  90   return path.length() > 1 &&
  91       FilePath::IsSeparator(path[0]) && FilePath::IsSeparator(path[1]);
  92 #else  // FILE_PATH_USES_DRIVE_LETTERS
  93   // Look for a separator in the first position.
  94   return path.length() > 0 && FilePath::IsSeparator(path[0]);
  95 #endif  // FILE_PATH_USES_DRIVE_LETTERS
  96 }
  97
  98 bool AreAllSeparators(const StringType& input) {
  99   for (StringType::const_iterator it = input.begin();
 100       it != input.end(); ++it) {
 101     if (!FilePath::IsSeparator(*it))
 102       return false;
 103   }
 104
 105   return true;
 106 }
 107
 108 // Find the position of the '.' that separates the extension from the rest
 109 // of the file name. The position is relative to BaseName(), not value().
 110 // This allows a second extension component of up to 4 characters when the
 111 // rightmost extension component is a common double extension (gz, bz2, Z).
 112 // For example, foo.tar.gz or foo.tar.Z would have extension components of
 113 // '.tar.gz' and '.tar.Z' respectively. Returns npos if it can't find an
 114 // extension.
 115 StringType::size_type ExtensionSeparatorPosition(const StringType& path) {
 116   // Special case "." and ".."
 117   if (path == FilePath::kCurrentDirectory || path == FilePath::kParentDirectory)
 118     return StringType::npos;
 119
 120   const StringType::size_type last_dot =
 121       path.rfind(FilePath::kExtensionSeparator);
 122
 123   // No extension, or the extension is the whole filename.
 124   if (last_dot == StringType::npos || last_dot == 0U)
 125     return last_dot;
 126
 127   const StringType::size_type penultimate_dot =
 128       path.rfind(FilePath::kExtensionSeparator, last_dot - 1);
 129   const StringType::size_type last_separator =
 130       path.find_last_of(FilePath::kSeparators, last_dot - 1,
 131                         FilePath::kSeparatorsLength - 1);
 132
 133   if (penultimate_dot == StringType::npos ||
 134       (last_separator != StringType::npos &&
 135        penultimate_dot < last_separator)) {
 136     return last_dot;
 137   }
 138
 139   for (size_t i = 0; i < arraysize(kCommonDoubleExtensions); ++i) {
 140     StringType extension(path, penultimate_dot + 1);
 141     if (LowerCaseEqualsASCII(extension, kCommonDoubleExtensions[i]))
 142       return penultimate_dot;
 143   }
 144
 145   StringType extension(path, last_dot + 1);
 146   for (size_t i = 0; i < arraysize(kCommonDoubleExtensionSuffixes); ++i) {
 147     if (LowerCaseEqualsASCII(extension, kCommonDoubleExtensionSuffixes[i])) {
 148       if ((last_dot - penultimate_dot) <= 5U &&
 149           (last_dot - penultimate_dot) > 1U) {
 150         return penultimate_dot;
 151       }
 152     }
 153   }
 154
 155   return last_dot;
 156 }
 157
 158 // Returns true if path is "", ".", or "..".
 159 bool IsEmptyOrSpecialCase(const StringType& path) {
 160   // Special cases "", ".", and ".."
 161   if (path.empty() || path == FilePath::kCurrentDirectory ||
 162       path == FilePath::kParentDirectory) {
 163     return true;
 164   }
 165
 166   return false;
 167 }
 168
 169 }  // namespace
 170
 171 FilePath::FilePath() {
 172 }
 173
 174 FilePath::FilePath(const FilePath& that) : path_(that.path_) {
 175 }
 176
 177 FilePath::FilePath(const StringType& path) : path_(path) {
 178   StringType::size_type nul_pos = path_.find(kStringTerminator);
 179   if (nul_pos != StringType::npos)
 180     path_.erase(nul_pos, StringType::npos);
 181 }
 182
 183 FilePath::~FilePath() {
 184 }
 185
 186 FilePath& FilePath::operator=(const FilePath& that) {
 187   path_ = that.path_;
 188   return *this;
 189 }
 190
 191 bool FilePath::operator==(const FilePath& that) const {
 192 #if defined(FILE_PATH_USES_DRIVE_LETTERS)
 193   return EqualDriveLetterCaseInsensitive(this->path_, that.path_);
 194 #else  // defined(FILE_PATH_USES_DRIVE_LETTERS)
 195   return path_ == that.path_;
 196 #endif  // defined(FILE_PATH_USES_DRIVE_LETTERS)
 197 }
 198
 199 bool FilePath::operator!=(const FilePath& that) const {
 200 #if defined(FILE_PATH_USES_DRIVE_LETTERS)
 201   return !EqualDriveLetterCaseInsensitive(this->path_, that.path_);
 202 #else  // defined(FILE_PATH_USES_DRIVE_LETTERS)
 203   return path_ != that.path_;
 204 #endif  // defined(FILE_PATH_USES_DRIVE_LETTERS)
 205 }
 206
 207 // static
 208 bool FilePath::IsSeparator(CharType character) {
 209   for (size_t i = 0; i < kSeparatorsLength - 1; ++i) {
 210     if (character == kSeparators[i]) {
 211       return true;
 212     }
 213   }
 214
 215   return false;
 216 }
 217
 218 void FilePath::GetComponents(std::vector<StringType>* components) const {
 219   DCHECK(components);
 220   if (!components)
 221     return;
 222   components->clear();
 223   if (value().empty())
 224     return;
 225
 226   std::vector<StringType> ret_val;
 227   FilePath current = *this;
 228   FilePath base;
 229
 230   // Capture path components.
 231   while (current != current.DirName()) {
 232     base = current.BaseName();
 233     if (!AreAllSeparators(base.value()))
 234       ret_val.push_back(base.value());
 235     current = current.DirName();
 236   }
 237
 238   // Capture root, if any.
 239   base = current.BaseName();
 240   if (!base.value().empty() && base.value() != kCurrentDirectory)
 241     ret_val.push_back(current.BaseName().value());
 242
 243   // Capture drive letter, if any.
 244   FilePath dir = current.DirName();
 245   StringType::size_type letter = FindDriveLetter(dir.value());
 246   if (letter != StringType::npos) {
 247     ret_val.push_back(StringType(dir.value(), 0, letter + 1));
 248   }
 249
 250   *components = std::vector<StringType>(ret_val.rbegin(), ret_val.rend());
 251 }
 252
 253 bool FilePath::IsParent(const FilePath& child) const {
 254   return AppendRelativePath(child, NULL);
 255 }
 256
 257 bool FilePath::AppendRelativePath(const FilePath& child,
 258                                   FilePath* path) const {
 259   std::vector<StringType> parent_components;
 260   std::vector<StringType> child_components;
 261   GetComponents(&parent_components);
 262   child.GetComponents(&child_components);
 263
 264   if (parent_components.empty() ||
 265       parent_components.size() >= child_components.size())
 266     return false;
 267
 268   std::vector<StringType>::const_iterator parent_comp =
 269       parent_components.begin();
 270   std::vector<StringType>::const_iterator child_comp =
 271       child_components.begin();
 272
 273 #if defined(FILE_PATH_USES_DRIVE_LETTERS)
 274   // Windows can access case sensitive filesystems, so component
 275   // comparisions must be case sensitive, but drive letters are
 276   // never case sensitive.
 277   if ((FindDriveLetter(*parent_comp) != StringType::npos) &&
 278       (FindDriveLetter(*child_comp) != StringType::npos)) {
 279     if (!StartsWith(*parent_comp, *child_comp, false))
 280       return false;
 281     ++parent_comp;
 282     ++child_comp;
 283   }
 284 #endif  // defined(FILE_PATH_USES_DRIVE_LETTERS)
 285
 286   while (parent_comp != parent_components.end()) {
 287     if (*parent_comp != *child_comp)
 288       return false;
 289     ++parent_comp;
 290     ++child_comp;
 291   }
 292
 293   if (path != NULL) {
 294     for (; child_comp != child_components.end(); ++child_comp) {
 295       *path = path->Append(*child_comp);
 296     }
 297   }
 298   return true;
 299 }
 300
 301 // libgen's dirname and basename aren't guaranteed to be thread-safe and aren't
 302 // guaranteed to not modify their input strings, and in fact are implemented
 303 // differently in this regard on different platforms.  Don't use them, but
 304 // adhere to their behavior.
 305 FilePath FilePath::DirName() const {
 306   FilePath new_path(path_);
 307   new_path.StripTrailingSeparatorsInternal();
 308
 309   // The drive letter, if any, always needs to remain in the output.  If there
 310   // is no drive letter, as will always be the case on platforms which do not
 311   // support drive letters, letter will be npos, or -1, so the comparisons and
 312   // resizes below using letter will still be valid.
 313   StringType::size_type letter = FindDriveLetter(new_path.path_);
 314
 315   StringType::size_type last_separator =
 316       new_path.path_.find_last_of(kSeparators, StringType::npos,
 317                                   kSeparatorsLength - 1);
 318   if (last_separator == StringType::npos) {
 319     // path_ is in the current directory.
 320     new_path.path_.resize(letter + 1);
 321   } else if (last_separator == letter + 1) {
 322     // path_ is in the root directory.
 323     new_path.path_.resize(letter + 2);
 324   } else if (last_separator == letter + 2 &&
 325              IsSeparator(new_path.path_[letter + 1])) {
 326     // path_ is in "//" (possibly with a drive letter); leave the double
 327     // separator intact indicating alternate root.
 328     new_path.path_.resize(letter + 3);
 329   } else if (last_separator != 0) {
 330     // path_ is somewhere else, trim the basename.
 331     new_path.path_.resize(last_separator);
 332   }
 333
 334   new_path.StripTrailingSeparatorsInternal();
 335   if (!new_path.path_.length())
 336     new_path.path_ = kCurrentDirectory;
 337
 338   return new_path;
 339 }
 340
 341 FilePath FilePath::BaseName() const {
 342   FilePath new_path(path_);
 343   new_path.StripTrailingSeparatorsInternal();
 344
 345   // The drive letter, if any, is always stripped.
 346   StringType::size_type letter = FindDriveLetter(new_path.path_);
 347   if (letter != StringType::npos) {
 348     new_path.path_.erase(0, letter + 1);
 349   }
 350
 351   // Keep everything after the final separator, but if the pathname is only
 352   // one character and it's a separator, leave it alone.
 353   StringType::size_type last_separator =
 354       new_path.path_.find_last_of(kSeparators, StringType::npos,
 355                                   kSeparatorsLength - 1);
 356   if (last_separator != StringType::npos &&
 357       last_separator < new_path.path_.length() - 1) {
 358     new_path.path_.erase(0, last_separator + 1);
 359   }
 360
 361   return new_path;
 362 }
 363
 364 StringType FilePath::Extension() const {
 365   FilePath base(BaseName());
 366   const StringType::size_type dot = ExtensionSeparatorPosition(base.path_);
 367   if (dot == StringType::npos)
 368     return StringType();
 369
 370   return base.path_.substr(dot, StringType::npos);
 371 }
 372
 373 FilePath FilePath::RemoveExtension() const {
 374   if (Extension().empty())
 375     return *this;
 376
 377   const StringType::size_type dot = ExtensionSeparatorPosition(path_);
 378   if (dot == StringType::npos)
 379     return *this;
 380
 381   return FilePath(path_.substr(0, dot));
 382 }
 383
 384 FilePath FilePath::InsertBeforeExtension(const StringType& suffix) const {
 385   if (suffix.empty())
 386     return FilePath(path_);
 387
 388   if (IsEmptyOrSpecialCase(BaseName().value()))
 389     return FilePath();
 390
 391   StringType ext = Extension();
 392   StringType ret = RemoveExtension().value();
 393   ret.append(suffix);
 394   ret.append(ext);
 395   return FilePath(ret);
 396 }
 397
 398 FilePath FilePath::InsertBeforeExtensionASCII(const StringPiece& suffix)
 399     const {
 400   DCHECK(IsStringASCII(suffix));
 401 #if defined(OS_WIN)
 402   return InsertBeforeExtension(ASCIIToUTF16(suffix.as_string()));
 403 #elif defined(OS_POSIX)
 404   return InsertBeforeExtension(suffix.as_string());
 405 #endif
 406 }
 407
 408 FilePath FilePath::AddExtension(const StringType& extension) const {
 409   if (IsEmptyOrSpecialCase(BaseName().value()))
 410     return FilePath();
 411
 412   // If the new extension is "" or ".", then just return the current FilePath.
 413   if (extension.empty() || extension == StringType(1, kExtensionSeparator))
 414     return *this;
 415
 416   StringType str = path_;
 417   if (extension[0] != kExtensionSeparator &&
 418       *(str.end() - 1) != kExtensionSeparator) {
 419     str.append(1, kExtensionSeparator);
 420   }
 421   str.append(extension);
 422   return FilePath(str);
 423 }
 424
 425 FilePath FilePath::ReplaceExtension(const StringType& extension) const {
 426   if (IsEmptyOrSpecialCase(BaseName().value()))
 427     return FilePath();
 428
 429   FilePath no_ext = RemoveExtension();
 430   // If the new extension is "" or ".", then just remove the current extension.
 431   if (extension.empty() || extension == StringType(1, kExtensionSeparator))
 432     return no_ext;
 433
 434   StringType str = no_ext.value();
 435   if (extension[0] != kExtensionSeparator)
 436     str.append(1, kExtensionSeparator);
 437   str.append(extension);
 438   return FilePath(str);
 439 }
 440
 441 bool FilePath::MatchesExtension(const StringType& extension) const {
 442   DCHECK(extension.empty() || extension[0] == kExtensionSeparator);
 443
 444   StringType current_extension = Extension();
 445
 446   if (current_extension.length() != extension.length())
 447     return false;
 448
 449   return FilePath::CompareEqualIgnoreCase(extension, current_extension);
 450 }
 451
 452 FilePath FilePath::Append(const StringType& component) const {
 453   const StringType* appended = &component;
 454   StringType without_nuls;
 455
 456   StringType::size_type nul_pos = component.find(kStringTerminator);
 457   if (nul_pos != StringType::npos) {
 458     without_nuls = component.substr(0, nul_pos);
 459     appended = &without_nuls;
 460   }
 461
 462   DCHECK(!IsPathAbsolute(*appended));
 463
 464   if (path_.compare(kCurrentDirectory) == 0) {
 465     // Append normally doesn't do any normalization, but as a special case,
 466     // when appending to kCurrentDirectory, just return a new path for the
 467     // component argument.  Appending component to kCurrentDirectory would
 468     // serve no purpose other than needlessly lengthening the path, and
 469     // it's likely in practice to wind up with FilePath objects containing
 470     // only kCurrentDirectory when calling DirName on a single relative path
 471     // component.
 472     return FilePath(*appended);
 473   }
 474
 475   FilePath new_path(path_);
 476   new_path.StripTrailingSeparatorsInternal();
 477
 478   // Don't append a separator if the path is empty (indicating the current
 479   // directory) or if the path component is empty (indicating nothing to
 480   // append).
 481   if (appended->length() > 0 && new_path.path_.length() > 0) {
 482     // Don't append a separator if the path still ends with a trailing
 483     // separator after stripping (indicating the root directory).
 484     if (!IsSeparator(new_path.path_[new_path.path_.length() - 1])) {
 485       // Don't append a separator if the path is just a drive letter.
 486       if (FindDriveLetter(new_path.path_) + 1 != new_path.path_.length()) {
 487         new_path.path_.append(1, kSeparators[0]);
 488       }
 489     }
 490   }
 491
 492   new_path.path_.append(*appended);
 493   return new_path;
 494 }
 495
 496 FilePath FilePath::Append(const FilePath& component) const {
 497   return Append(component.value());
 498 }
 499
 500 FilePath FilePath::AppendASCII(const StringPiece& component) const {
 501   DCHECK(IsStringASCII(component));
 502 #if defined(OS_WIN)
 503   return Append(ASCIIToUTF16(component.as_string()));
 504 #elif defined(OS_POSIX)
 505   return Append(component.as_string());
 506 #endif
 507 }
 508
 509 bool FilePath::IsAbsolute() const {
 510   return IsPathAbsolute(path_);
 511 }
 512
 513 bool FilePath::EndsWithSeparator() const {
 514   if (empty())
 515     return false;
 516   return IsSeparator(path_[path_.size() - 1]);
 517 }
 518
 519 FilePath FilePath::AsEndingWithSeparator() const {
 520   if (EndsWithSeparator() || path_.empty())
 521     return *this;
 522
 523   StringType path_str;
 524   path_str.reserve(path_.length() + 1);  // Only allocate string once.
 525
 526   path_str = path_;
 527   path_str.append(&kSeparators[0], 1);
 528   return FilePath(path_str);
 529 }
 530
 531 FilePath FilePath::StripTrailingSeparators() const {
 532   FilePath new_path(path_);
 533   new_path.StripTrailingSeparatorsInternal();
 534
 535   return new_path;
 536 }
 537
 538 bool FilePath::ReferencesParent() const {
 539   std::vector<StringType> components;
 540   GetComponents(&components);
 541
 542   std::vector<StringType>::const_iterator it = components.begin();
 543   for (; it != components.end(); ++it) {
 544     const StringType& component = *it;
 545     // Windows has odd, undocumented behavior with path components containing
 546     // only whitespace and . characters. So, if all we see is . and
 547     // whitespace, then we treat any .. sequence as referencing parent.
 548     // For simplicity we enforce this on all platforms.
 549     if (component.find_first_not_of(FILE_PATH_LITERAL(". \n\r\t")) ==
 550             std::string::npos &&
 551         component.find(kParentDirectory) != std::string::npos) {
 552       return true;
 553     }
 554   }
 555   return false;
 556 }
 557
 558 #if defined(OS_POSIX)
 559 // See file_path.h for a discussion of the encoding of paths on POSIX
 560 // platforms.  These encoding conversion functions are not quite correct.
 561
 562 string16 FilePath::LossyDisplayName() const {
 563   return WideToUTF16(SysNativeMBToWide(path_));
 564 }
 565
 566 std::string FilePath::MaybeAsASCII() const {
 567   if (IsStringASCII(path_))
 568     return path_;
 569   return std::string();
 570 }
 571
 572 std::string FilePath::AsUTF8Unsafe() const {
 573 #if defined(OS_MACOSX) || defined(OS_CHROMEOS)
 574   return value();
 575 #else
 576   return WideToUTF8(SysNativeMBToWide(value()));
 577 #endif
 578 }
 579
 580 // The *Hack functions are temporary while we fix the remainder of the code.
 581 // Remember to remove the #includes at the top when you remove these.
 582
 583 // static
 584 FilePath FilePath::FromWStringHack(const std::wstring& wstring) {
 585   return FilePath(SysWideToNativeMB(wstring));
 586 }
 587
 588 // static
 589 FilePath FilePath::FromUTF8Unsafe(const std::string& utf8) {
 590 #if defined(OS_MACOSX) || defined(OS_CHROMEOS)
 591   return FilePath(utf8);
 592 #else
 593   return FilePath(SysWideToNativeMB(UTF8ToWide(utf8)));
 594 #endif
 595 }
 596
 597 #elif defined(OS_WIN)
 598 string16 FilePath::LossyDisplayName() const {
 599   return path_;
 600 }
 601
 602 std::string FilePath::MaybeAsASCII() const {
 603   if (IsStringASCII(path_))
 604     return WideToASCII(path_);
 605   return "";
 606 }
 607
 608 std::string FilePath::AsUTF8Unsafe() const {
 609   return WideToUTF8(value());
 610 }
 611
 612 // static
 613 FilePath FilePath::FromWStringHack(const std::wstring& wstring) {
 614   return FilePath(wstring);
 615 }
 616
 617 // static
 618 FilePath FilePath::FromUTF8Unsafe(const std::string& utf8) {
 619   return FilePath(UTF8ToWide(utf8));
 620 }
 621 #endif
 622
 623 void FilePath::WriteToPickle(Pickle* pickle) const {
 624 #if defined(OS_WIN)
 625   pickle->WriteString16(path_);
 626 #else
 627   pickle->WriteString(path_);
 628 #endif
 629 }
 630
 631 bool FilePath::ReadFromPickle(PickleIterator* iter) {
 632 #if defined(OS_WIN)
 633   if (!iter->ReadString16(&path_))
 634     return false;
 635 #else
 636   if (!iter->ReadString(&path_))
 637     return false;
 638 #endif
 639
 640   if (path_.find(kStringTerminator) != StringType::npos)
 641     return false;
 642
 643   return true;
 644 }
 645
 646 #if defined(OS_WIN)
 647 // Windows specific implementation of file string comparisons
 648
 649 int FilePath::CompareIgnoreCase(const StringType& string1,
 650                                 const StringType& string2) {
 651   // Perform character-wise upper case comparison rather than using the
 652   // fully Unicode-aware CompareString(). For details see:
 653   // http://blogs.msdn.com/michkap/archive/2005/10/17/481600.aspx
 654   StringType::const_iterator i1 = string1.begin();
 655   StringType::const_iterator i2 = string2.begin();
 656   StringType::const_iterator string1end = string1.end();
 657   StringType::const_iterator string2end = string2.end();
 658   for ( ; i1 != string1end && i2 != string2end; ++i1, ++i2) {
 659     wchar_t c1 = (wchar_t)LOWORD(::CharUpperW((LPWSTR)MAKELONG(*i1, 0)));
 660     wchar_t c2 = (wchar_t)LOWORD(::CharUpperW((LPWSTR)MAKELONG(*i2, 0)));
 661     if (c1 < c2)
 662       return -1;
 663     if (c1 > c2)
 664       return 1;
 665   }
 666   if (i1 != string1end)
 667     return 1;
 668   if (i2 != string2end)
 669     return -1;
 670   return 0;
 671 }
 672
 673 #elif defined(OS_MACOSX)
 674 // Mac OS X specific implementation of file string comparisons
 675
 676 // cf. http://developer.apple.com/mac/library/technotes/tn/tn1150.html#UnicodeSubtleties
 677 //
 678 // "When using CreateTextEncoding to create a text encoding, you should set
 679 // the TextEncodingBase to kTextEncodingUnicodeV2_0, set the
 680 // TextEncodingVariant to kUnicodeCanonicalDecompVariant, and set the
 681 // TextEncodingFormat to kUnicode16BitFormat. Using these values ensures that
 682 // the Unicode will be in the same form as on an HFS Plus volume, even as the
 683 // Unicode standard evolves."
 684 //
 685 // Another technical article for X 10.4 updates this: one should use
 686 // the new (unambiguous) kUnicodeHFSPlusDecompVariant.
 687 // cf. http://developer.apple.com/mac/library/releasenotes/TextFonts/RN-TEC/index.html
 688 //
 689 // This implementation uses CFStringGetFileSystemRepresentation() to get the
 690 // decomposed form, and an adapted version of the FastUnicodeCompare as
 691 // described in the tech note to compare the strings.
 692
 693 // Character conversion table for FastUnicodeCompare()
 694 //
 695 // The lower case table consists of a 256-entry high-byte table followed by
 696 // some number of 256-entry subtables. The high-byte table contains either an
 697 // offset to the subtable for characters with that high byte or zero, which
 698 // means that there are no case mappings or ignored characters in that block.
 699 // Ignored characters are mapped to zero.
 700 //
 701 // cf. downloadable file linked in
 702 // http://developer.apple.com/mac/library/technotes/tn/tn1150.html#StringComparisonAlgorithm
 703
 704 namespace {
 705
 706 const UInt16 lower_case_table[] = {
 707   // High-byte indices ( == 0 iff no case mapping and no ignorables )
 708
 709   /* 0 */ 0x0100, 0x0200, 0x0000, 0x0300, 0x0400, 0x0500, 0x0000, 0x0000,
 710           0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
 711   /* 1 */ 0x0600, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
 712           0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
 713   /* 2 */ 0x0700, 0x0800, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
 714           0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
 715   /* 3 */ 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
 716           0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
 717   /* 4 */ 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
 718           0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
 719   /* 5 */ 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
 720           0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
 721   /* 6 */ 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
 722           0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
 723   /* 7 */ 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
 724           0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
 725   /* 8 */ 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
 726           0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
 727   /* 9 */ 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
 728           0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
 729   /* A */ 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
 730           0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
 731   /* B */ 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
 732           0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
 733   /* C */ 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
 734           0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
 735   /* D */ 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
 736           0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
 737   /* E */ 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
 738           0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
 739   /* F */ 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
 740           0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0900, 0x0A00,
 741
 742   // Table 1 (for high byte 0x00)
 743
 744   /* 0 */ 0xFFFF, 0x0001, 0x0002, 0x0003, 0x0004, 0x0005, 0x0006, 0x0007,
 745           0x0008, 0x0009, 0x000A, 0x000B, 0x000C, 0x000D, 0x000E, 0x000F,
 746   /* 1 */ 0x0010, 0x0011, 0x0012, 0x0013, 0x0014, 0x0015, 0x0016, 0x0017,
 747           0x0018, 0x0019, 0x001A, 0x001B, 0x001C, 0x001D, 0x001E, 0x001F,
 748   /* 2 */ 0x0020, 0x0021, 0x0022, 0x0023, 0x0024, 0x0025, 0x0026, 0x0027,
 749           0x0028, 0x0029, 0x002A, 0x002B, 0x002C, 0x002D, 0x002E, 0x002F,
 750   /* 3 */ 0x0030, 0x0031, 0x0032, 0x0033, 0x0034, 0x0035, 0x0036, 0x0037,
 751           0x0038, 0x0039, 0x003A, 0x003B, 0x003C, 0x003D, 0x003E, 0x003F,
 752   /* 4 */ 0x0040, 0x0061, 0x0062, 0x0063, 0x0064, 0x0065, 0x0066, 0x0067,
 753           0x0068, 0x0069, 0x006A, 0x006B, 0x006C, 0x006D, 0x006E, 0x006F,
 754   /* 5 */ 0x0070, 0x0071, 0x0072, 0x0073, 0x0074, 0x0075, 0x0076, 0x0077,
 755           0x0078, 0x0079, 0x007A, 0x005B, 0x005C, 0x005D, 0x005E, 0x005F,
 756   /* 6 */ 0x0060, 0x0061, 0x0062, 0x0063, 0x0064, 0x0065, 0x0066, 0x0067,
 757           0x0068, 0x0069, 0x006A, 0x006B, 0x006C, 0x006D, 0x006E, 0x006F,
 758   /* 7 */ 0x0070, 0x0071, 0x0072, 0x0073, 0x0074, 0x0075, 0x0076, 0x0077,
 759           0x0078, 0x0079, 0x007A, 0x007B, 0x007C, 0x007D, 0x007E, 0x007F,
 760   /* 8 */ 0x0080, 0x0081, 0x0082, 0x0083, 0x0084, 0x0085, 0x0086, 0x0087,
 761           0x0088, 0x0089, 0x008A, 0x008B, 0x008C, 0x008D, 0x008E, 0x008F,
 762   /* 9 */ 0x0090, 0x0091, 0x0092, 0x0093, 0x0094, 0x0095, 0x0096, 0x0097,
 763           0x0098, 0x0099, 0x009A, 0x009B, 0x009C, 0x009D, 0x009E, 0x009F,
 764   /* A */ 0x00A0, 0x00A1, 0x00A2, 0x00A3, 0x00A4, 0x00A5, 0x00A6, 0x00A7,
 765           0x00A8, 0x00A9, 0x00AA, 0x00AB, 0x00AC, 0x00AD, 0x00AE, 0x00AF,
 766   /* B */ 0x00B0, 0x00B1, 0x00B2, 0x00B3, 0x00B4, 0x00B5, 0x00B6, 0x00B7,
 767           0x00B8, 0x00B9, 0x00BA, 0x00BB, 0x00BC, 0x00BD, 0x00BE, 0x00BF,
 768   /* C */ 0x00C0, 0x00C1, 0x00C2, 0x00C3, 0x00C4, 0x00C5, 0x00E6, 0x00C7,
 769           0x00C8, 0x00C9, 0x00CA, 0x00CB, 0x00CC, 0x00CD, 0x00CE, 0x00CF,
 770   /* D */ 0x00F0, 0x00D1, 0x00D2, 0x00D3, 0x00D4, 0x00D5, 0x00D6, 0x00D7,
 771           0x00F8, 0x00D9, 0x00DA, 0x00DB, 0x00DC, 0x00DD, 0x00FE, 0x00DF,
 772   /* E */ 0x00E0, 0x00E1, 0x00E2, 0x00E3, 0x00E4, 0x00E5, 0x00E6, 0x00E7,
 773           0x00E8, 0x00E9, 0x00EA, 0x00EB, 0x00EC, 0x00ED, 0x00EE, 0x00EF,
 774   /* F */ 0x00F0, 0x00F1, 0x00F2, 0x00F3, 0x00F4, 0x00F5, 0x00F6, 0x00F7,
 775           0x00F8, 0x00F9, 0x00FA, 0x00FB, 0x00FC, 0x00FD, 0x00FE, 0x00FF,
 776
 777   // Table 2 (for high byte 0x01)
 778
 779   /* 0 */ 0x0100, 0x0101, 0x0102, 0x0103, 0x0104, 0x0105, 0x0106, 0x0107,
 780           0x0108, 0x0109, 0x010A, 0x010B, 0x010C, 0x010D, 0x010E, 0x010F,
 781   /* 1 */ 0x0111, 0x0111, 0x0112, 0x0113, 0x0114, 0x0115, 0x0116, 0x0117,
 782           0x0118, 0x0119, 0x011A, 0x011B, 0x011C, 0x011D, 0x011E, 0x011F,
 783   /* 2 */ 0x0120, 0x0121, 0x0122, 0x0123, 0x0124, 0x0125, 0x0127, 0x0127,
 784           0x0128, 0x0129, 0x012A, 0x012B, 0x012C, 0x012D, 0x012E, 0x012F,
 785   /* 3 */ 0x0130, 0x0131, 0x0133, 0x0133, 0x0134, 0x0135, 0x0136, 0x0137,
 786           0x0138, 0x0139, 0x013A, 0x013B, 0x013C, 0x013D, 0x013E, 0x0140,
 787   /* 4 */ 0x0140, 0x0142, 0x0142, 0x0143, 0x0144, 0x0145, 0x0146, 0x0147,
 788           0x0148, 0x0149, 0x014B, 0x014B, 0x014C, 0x014D, 0x014E, 0x014F,
 789   /* 5 */ 0x0150, 0x0151, 0x0153, 0x0153, 0x0154, 0x0155, 0x0156, 0x0157,
 790           0x0158, 0x0159, 0x015A, 0x015B, 0x015C, 0x015D, 0x015E, 0x015F,
 791   /* 6 */ 0x0160, 0x0161, 0x0162, 0x0163, 0x0164, 0x0165, 0x0167, 0x0167,
 792           0x0168, 0x0169, 0x016A, 0x016B, 0x016C, 0x016D, 0x016E, 0x016F,
 793   /* 7 */ 0x0170, 0x0171, 0x0172, 0x0173, 0x0174, 0x0175, 0x0176, 0x0177,
 794           0x0178, 0x0179, 0x017A, 0x017B, 0x017C, 0x017D, 0x017E, 0x017F,
 795   /* 8 */ 0x0180, 0x0253, 0x0183, 0x0183, 0x0185, 0x0185, 0x0254, 0x0188,
 796           0x0188, 0x0256, 0x0257, 0x018C, 0x018C, 0x018D, 0x01DD, 0x0259,
 797   /* 9 */ 0x025B, 0x0192, 0x0192, 0x0260, 0x0263, 0x0195, 0x0269, 0x0268,
 798           0x0199, 0x0199, 0x019A, 0x019B, 0x026F, 0x0272, 0x019E, 0x0275,
 799   /* A */ 0x01A0, 0x01A1, 0x01A3, 0x01A3, 0x01A5, 0x01A5, 0x01A6, 0x01A8,
 800           0x01A8, 0x0283, 0x01AA, 0x01AB, 0x01AD, 0x01AD, 0x0288, 0x01AF,
 801   /* B */ 0x01B0, 0x028A, 0x028B, 0x01B4, 0x01B4, 0x01B6, 0x01B6, 0x0292,
 802           0x01B9, 0x01B9, 0x01BA, 0x01BB, 0x01BD, 0x01BD, 0x01BE, 0x01BF,
 803   /* C */ 0x01C0, 0x01C1, 0x01C2, 0x01C3, 0x01C6, 0x01C6, 0x01C6, 0x01C9,
 804           0x01C9, 0x01C9, 0x01CC, 0x01CC, 0x01CC, 0x01CD, 0x01CE, 0x01CF,
 805   /* D */ 0x01D0, 0x01D1, 0x01D2, 0x01D3, 0x01D4, 0x01D5, 0x01D6, 0x01D7,
 806           0x01D8, 0x01D9, 0x01DA, 0x01DB, 0x01DC, 0x01DD, 0x01DE, 0x01DF,
 807   /* E */ 0x01E0, 0x01E1, 0x01E2, 0x01E3, 0x01E5, 0x01E5, 0x01E6, 0x01E7,
 808           0x01E8, 0x01E9, 0x01EA, 0x01EB, 0x01EC, 0x01ED, 0x01EE, 0x01EF,
 809   /* F */ 0x01F0, 0x01F3, 0x01F3, 0x01F3, 0x01F4, 0x01F5, 0x01F6, 0x01F7,
 810           0x01F8, 0x01F9, 0x01FA, 0x01FB, 0x01FC, 0x01FD, 0x01FE, 0x01FF,
 811
 812   // Table 3 (for high byte 0x03)
 813
 814   /* 0 */ 0x0300, 0x0301, 0x0302, 0x0303, 0x0304, 0x0305, 0x0306, 0x0307,
 815           0x0308, 0x0309, 0x030A, 0x030B, 0x030C, 0x030D, 0x030E, 0x030F,
 816   /* 1 */ 0x0310, 0x0311, 0x0312, 0x0313, 0x0314, 0x0315, 0x0316, 0x0317,
 817           0x0318, 0x0319, 0x031A, 0x031B, 0x031C, 0x031D, 0x031E, 0x031F,
 818   /* 2 */ 0x0320, 0x0321, 0x0322, 0x0323, 0x0324, 0x0325, 0x0326, 0x0327,
 819           0x0328, 0x0329, 0x032A, 0x032B, 0x032C, 0x032D, 0x032E, 0x032F,
 820   /* 3 */ 0x0330, 0x0331, 0x0332, 0x0333, 0x0334, 0x0335, 0x0336, 0x0337,
 821           0x0338, 0x0339, 0x033A, 0x033B, 0x033C, 0x033D, 0x033E, 0x033F,
 822   /* 4 */ 0x0340, 0x0341, 0x0342, 0x0343, 0x0344, 0x0345, 0x0346, 0x0347,
 823           0x0348, 0x0349, 0x034A, 0x034B, 0x034C, 0x034D, 0x034E, 0x034F,
 824   /* 5 */ 0x0350, 0x0351, 0x0352, 0x0353, 0x0354, 0x0355, 0x0356, 0x0357,
 825           0x0358, 0x0359, 0x035A, 0x035B, 0x035C, 0x035D, 0x035E, 0x035F,
 826   /* 6 */ 0x0360, 0x0361, 0x0362, 0x0363, 0x0364, 0x0365, 0x0366, 0x0367,
 827           0x0368, 0x0369, 0x036A, 0x036B, 0x036C, 0x036D, 0x036E, 0x036F,
 828   /* 7 */ 0x0370, 0x0371, 0x0372, 0x0373, 0x0374, 0x0375, 0x0376, 0x0377,
 829           0x0378, 0x0379, 0x037A, 0x037B, 0x037C, 0x037D, 0x037E, 0x037F,
 830   /* 8 */ 0x0380, 0x0381, 0x0382, 0x0383, 0x0384, 0x0385, 0x0386, 0x0387,
 831           0x0388, 0x0389, 0x038A, 0x038B, 0x038C, 0x038D, 0x038E, 0x038F,
 832   /* 9 */ 0x0390, 0x03B1, 0x03B2, 0x03B3, 0x03B4, 0x03B5, 0x03B6, 0x03B7,
 833           0x03B8, 0x03B9, 0x03BA, 0x03BB, 0x03BC, 0x03BD, 0x03BE, 0x03BF,
 834   /* A */ 0x03C0, 0x03C1, 0x03A2, 0x03C3, 0x03C4, 0x03C5, 0x03C6, 0x03C7,
 835           0x03C8, 0x03C9, 0x03AA, 0x03AB, 0x03AC, 0x03AD, 0x03AE, 0x03AF,
 836   /* B */ 0x03B0, 0x03B1, 0x03B2, 0x03B3, 0x03B4, 0x03B5, 0x03B6, 0x03B7,
 837           0x03B8, 0x03B9, 0x03BA, 0x03BB, 0x03BC, 0x03BD, 0x03BE, 0x03BF,
 838   /* C */ 0x03C0, 0x03C1, 0x03C2, 0x03C3, 0x03C4, 0x03C5, 0x03C6, 0x03C7,
 839           0x03C8, 0x03C9, 0x03CA, 0x03CB, 0x03CC, 0x03CD, 0x03CE, 0x03CF,
 840   /* D */ 0x03D0, 0x03D1, 0x03D2, 0x03D3, 0x03D4, 0x03D5, 0x03D6, 0x03D7,
 841           0x03D8, 0x03D9, 0x03DA, 0x03DB, 0x03DC, 0x03DD, 0x03DE, 0x03DF,
 842   /* E */ 0x03E0, 0x03E1, 0x03E3, 0x03E3, 0x03E5, 0x03E5, 0x03E7, 0x03E7,
 843           0x03E9, 0x03E9, 0x03EB, 0x03EB, 0x03ED, 0x03ED, 0x03EF, 0x03EF,
 844   /* F */ 0x03F0, 0x03F1, 0x03F2, 0x03F3, 0x03F4, 0x03F5, 0x03F6, 0x03F7,
 845           0x03F8, 0x03F9, 0x03FA, 0x03FB, 0x03FC, 0x03FD, 0x03FE, 0x03FF,
 846
 847   // Table 4 (for high byte 0x04)
 848
 849   /* 0 */ 0x0400, 0x0401, 0x0452, 0x0403, 0x0454, 0x0455, 0x0456, 0x0407,
 850           0x0458, 0x0459, 0x045A, 0x045B, 0x040C, 0x040D, 0x040E, 0x045F,
 851   /* 1 */ 0x0430, 0x0431, 0x0432, 0x0433, 0x0434, 0x0435, 0x0436, 0x0437,
 852           0x0438, 0x0419, 0x043A, 0x043B, 0x043C, 0x043D, 0x043E, 0x043F,
 853   /* 2 */ 0x0440, 0x0441, 0x0442, 0x0443, 0x0444, 0x0445, 0x0446, 0x0447,
 854           0x0448, 0x0449, 0x044A, 0x044B, 0x044C, 0x044D, 0x044E, 0x044F,
 855   /* 3 */ 0x0430, 0x0431, 0x0432, 0x0433, 0x0434, 0x0435, 0x0436, 0x0437,
 856           0x0438, 0x0439, 0x043A, 0x043B, 0x043C, 0x043D, 0x043E, 0x043F,
 857   /* 4 */ 0x0440, 0x0441, 0x0442, 0x0443, 0x0444, 0x0445, 0x0446, 0x0447,
 858           0x0448, 0x0449, 0x044A, 0x044B, 0x044C, 0x044D, 0x044E, 0x044F,
 859   /* 5 */ 0x0450, 0x0451, 0x0452, 0x0453, 0x0454, 0x0455, 0x0456, 0x0457,
 860           0x0458, 0x0459, 0x045A, 0x045B, 0x045C, 0x045D, 0x045E, 0x045F,
 861   /* 6 */ 0x0461, 0x0461, 0x0463, 0x0463, 0x0465, 0x0465, 0x0467, 0x0467,
 862           0x0469, 0x0469, 0x046B, 0x046B, 0x046D, 0x046D, 0x046F, 0x046F,
 863   /* 7 */ 0x0471, 0x0471, 0x0473, 0x0473, 0x0475, 0x0475, 0x0476, 0x0477,
 864           0x0479, 0x0479, 0x047B, 0x047B, 0x047D, 0x047D, 0x047F, 0x047F,
 865   /* 8 */ 0x0481, 0x0481, 0x0482, 0x0483, 0x0484, 0x0485, 0x0486, 0x0487,
 866           0x0488, 0x0489, 0x048A, 0x048B, 0x048C, 0x048D, 0x048E, 0x048F,
 867   /* 9 */ 0x0491, 0x0491, 0x0493, 0x0493, 0x0495, 0x0495, 0x0497, 0x0497,
 868           0x0499, 0x0499, 0x049B, 0x049B, 0x049D, 0x049D, 0x049F, 0x049F,
 869   /* A */ 0x04A1, 0x04A1, 0x04A3, 0x04A3, 0x04A5, 0x04A5, 0x04A7, 0x04A7,
 870           0x04A9, 0x04A9, 0x04AB, 0x04AB, 0x04AD, 0x04AD, 0x04AF, 0x04AF,
 871   /* B */ 0x04B1, 0x04B1, 0x04B3, 0x04B3, 0x04B5, 0x04B5, 0x04B7, 0x04B7,
 872           0x04B9, 0x04B9, 0x04BB, 0x04BB, 0x04BD, 0x04BD, 0x04BF, 0x04BF,
 873   /* C */ 0x04C0, 0x04C1, 0x04C2, 0x04C4, 0x04C4, 0x04C5, 0x04C6, 0x04C8,
 874           0x04C8, 0x04C9, 0x04CA, 0x04CC, 0x04CC, 0x04CD, 0x04CE, 0x04CF,
 875   /* D */ 0x04D0, 0x04D1, 0x04D2, 0x04D3, 0x04D4, 0x04D5, 0x04D6, 0x04D7,
 876           0x04D8, 0x04D9, 0x04DA, 0x04DB, 0x04DC, 0x04DD, 0x04DE, 0x04DF,
 877   /* E */ 0x04E0, 0x04E1, 0x04E2, 0x04E3, 0x04E4, 0x04E5, 0x04E6, 0x04E7,
 878           0x04E8, 0x04E9, 0x04EA, 0x04EB, 0x04EC, 0x04ED, 0x04EE, 0x04EF,
 879   /* F */ 0x04F0, 0x04F1, 0x04F2, 0x04F3, 0x04F4, 0x04F5, 0x04F6, 0x04F7,
 880           0x04F8, 0x04F9, 0x04FA, 0x04FB, 0x04FC, 0x04FD, 0x04FE, 0x04FF,
 881
 882   // Table 5 (for high byte 0x05)
 883
 884   /* 0 */ 0x0500, 0x0501, 0x0502, 0x0503, 0x0504, 0x0505, 0x0506, 0x0507,
 885           0x0508, 0x0509, 0x050A, 0x050B, 0x050C, 0x050D, 0x050E, 0x050F,
 886   /* 1 */ 0x0510, 0x0511, 0x0512, 0x0513, 0x0514, 0x0515, 0x0516, 0x0517,
 887           0x0518, 0x0519, 0x051A, 0x051B, 0x051C, 0x051D, 0x051E, 0x051F,
 888   /* 2 */ 0x0520, 0x0521, 0x0522, 0x0523, 0x0524, 0x0525, 0x0526, 0x0527,
 889           0x0528, 0x0529, 0x052A, 0x052B, 0x052C, 0x052D, 0x052E, 0x052F,
 890   /* 3 */ 0x0530, 0x0561, 0x0562, 0x0563, 0x0564, 0x0565, 0x0566, 0x0567,
 891           0x0568, 0x0569, 0x056A, 0x056B, 0x056C, 0x056D, 0x056E, 0x056F,
 892   /* 4 */ 0x0570, 0x0571, 0x0572, 0x0573, 0x0574, 0x0575, 0x0576, 0x0577,
 893           0x0578, 0x0579, 0x057A, 0x057B, 0x057C, 0x057D, 0x057E, 0x057F,
 894   /* 5 */ 0x0580, 0x0581, 0x0582, 0x0583, 0x0584, 0x0585, 0x0586, 0x0557,
 895           0x0558, 0x0559, 0x055A, 0x055B, 0x055C, 0x055D, 0x055E, 0x055F,
 896   /* 6 */ 0x0560, 0x0561, 0x0562, 0x0563, 0x0564, 0x0565, 0x0566, 0x0567,
 897           0x0568, 0x0569, 0x056A, 0x056B, 0x056C, 0x056D, 0x056E, 0x056F,
 898   /* 7 */ 0x0570, 0x0571, 0x0572, 0x0573, 0x0574, 0x0575, 0x0576, 0x0577,
 899           0x0578, 0x0579, 0x057A, 0x057B, 0x057C, 0x057D, 0x057E, 0x057F,
 900   /* 8 */ 0x0580, 0x0581, 0x0582, 0x0583, 0x0584, 0x0585, 0x0586, 0x0587,
 901           0x0588, 0x0589, 0x058A, 0x058B, 0x058C, 0x058D, 0x058E, 0x058F,
 902   /* 9 */ 0x0590, 0x0591, 0x0592, 0x0593, 0x0594, 0x0595, 0x0596, 0x0597,
 903           0x0598, 0x0599, 0x059A, 0x059B, 0x059C, 0x059D, 0x059E, 0x059F,
 904   /* A */ 0x05A0, 0x05A1, 0x05A2, 0x05A3, 0x05A4, 0x05A5, 0x05A6, 0x05A7,
 905           0x05A8, 0x05A9, 0x05AA, 0x05AB, 0x05AC, 0x05AD, 0x05AE, 0x05AF,
 906   /* B */ 0x05B0, 0x05B1, 0x05B2, 0x05B3, 0x05B4, 0x05B5, 0x05B6, 0x05B7,
 907           0x05B8, 0x05B9, 0x05BA, 0x05BB, 0x05BC, 0x05BD, 0x05BE, 0x05BF,
 908   /* C */ 0x05C0, 0x05C1, 0x05C2, 0x05C3, 0x05C4, 0x05C5, 0x05C6, 0x05C7,
 909           0x05C8, 0x05C9, 0x05CA, 0x05CB, 0x05CC, 0x05CD, 0x05CE, 0x05CF,
 910   /* D */ 0x05D0, 0x05D1, 0x05D2, 0x05D3, 0x05D4, 0x05D5, 0x05D6, 0x05D7,
 911           0x05D8, 0x05D9, 0x05DA, 0x05DB, 0x05DC, 0x05DD, 0x05DE, 0x05DF,
 912   /* E */ 0x05E0, 0x05E1, 0x05E2, 0x05E3, 0x05E4, 0x05E5, 0x05E6, 0x05E7,
 913           0x05E8, 0x05E9, 0x05EA, 0x05EB, 0x05EC, 0x05ED, 0x05EE, 0x05EF,
 914   /* F */ 0x05F0, 0x05F1, 0x05F2, 0x05F3, 0x05F4, 0x05F5, 0x05F6, 0x05F7,
 915           0x05F8, 0x05F9, 0x05FA, 0x05FB, 0x05FC, 0x05FD, 0x05FE, 0x05FF,
 916
 917   // Table 6 (for high byte 0x10)
 918
 919   /* 0 */ 0x1000, 0x1001, 0x1002, 0x1003, 0x1004, 0x1005, 0x1006, 0x1007,
 920           0x1008, 0x1009, 0x100A, 0x100B, 0x100C, 0x100D, 0x100E, 0x100F,
 921   /* 1 */ 0x1010, 0x1011, 0x1012, 0x1013, 0x1014, 0x1015, 0x1016, 0x1017,
 922           0x1018, 0x1019, 0x101A, 0x101B, 0x101C, 0x101D, 0x101E, 0x101F,
 923   /* 2 */ 0x1020, 0x1021, 0x1022, 0x1023, 0x1024, 0x1025, 0x1026, 0x1027,
 924           0x1028, 0x1029, 0x102A, 0x102B, 0x102C, 0x102D, 0x102E, 0x102F,
 925   /* 3 */ 0x1030, 0x1031, 0x1032, 0x1033, 0x1034, 0x1035, 0x1036, 0x1037,
 926           0x1038, 0x1039, 0x103A, 0x103B, 0x103C, 0x103D, 0x103E, 0x103F,
 927   /* 4 */ 0x1040, 0x1041, 0x1042, 0x1043, 0x1044, 0x1045, 0x1046, 0x1047,
 928           0x1048, 0x1049, 0x104A, 0x104B, 0x104C, 0x104D, 0x104E, 0x104F,
 929   /* 5 */ 0x1050, 0x1051, 0x1052, 0x1053, 0x1054, 0x1055, 0x1056, 0x1057,
 930           0x1058, 0x1059, 0x105A, 0x105B, 0x105C, 0x105D, 0x105E, 0x105F,
 931   /* 6 */ 0x1060, 0x1061, 0x1062, 0x1063, 0x1064, 0x1065, 0x1066, 0x1067,
 932           0x1068, 0x1069, 0x106A, 0x106B, 0x106C, 0x106D, 0x106E, 0x106F,
 933   /* 7 */ 0x1070, 0x1071, 0x1072, 0x1073, 0x1074, 0x1075, 0x1076, 0x1077,
 934           0x1078, 0x1079, 0x107A, 0x107B, 0x107C, 0x107D, 0x107E, 0x107F,
 935   /* 8 */ 0x1080, 0x1081, 0x1082, 0x1083, 0x1084, 0x1085, 0x1086, 0x1087,
 936           0x1088, 0x1089, 0x108A, 0x108B, 0x108C, 0x108D, 0x108E, 0x108F,
 937   /* 9 */ 0x1090, 0x1091, 0x1092, 0x1093, 0x1094, 0x1095, 0x1096, 0x1097,
 938           0x1098, 0x1099, 0x109A, 0x109B, 0x109C, 0x109D, 0x109E, 0x109F,
 939   /* A */ 0x10D0, 0x10D1, 0x10D2, 0x10D3, 0x10D4, 0x10D5, 0x10D6, 0x10D7,
 940           0x10D8, 0x10D9, 0x10DA, 0x10DB, 0x10DC, 0x10DD, 0x10DE, 0x10DF,
 941   /* B */ 0x10E0, 0x10E1, 0x10E2, 0x10E3, 0x10E4, 0x10E5, 0x10E6, 0x10E7,
 942           0x10E8, 0x10E9, 0x10EA, 0x10EB, 0x10EC, 0x10ED, 0x10EE, 0x10EF,
 943   /* C */ 0x10F0, 0x10F1, 0x10F2, 0x10F3, 0x10F4, 0x10F5, 0x10C6, 0x10C7,
 944           0x10C8, 0x10C9, 0x10CA, 0x10CB, 0x10CC, 0x10CD, 0x10CE, 0x10CF,
 945   /* D */ 0x10D0, 0x10D1, 0x10D2, 0x10D3, 0x10D4, 0x10D5, 0x10D6, 0x10D7,
 946           0x10D8, 0x10D9, 0x10DA, 0x10DB, 0x10DC, 0x10DD, 0x10DE, 0x10DF,
 947   /* E */ 0x10E0, 0x10E1, 0x10E2, 0x10E3, 0x10E4, 0x10E5, 0x10E6, 0x10E7,
 948           0x10E8, 0x10E9, 0x10EA, 0x10EB, 0x10EC, 0x10ED, 0x10EE, 0x10EF,
 949   /* F */ 0x10F0, 0x10F1, 0x10F2, 0x10F3, 0x10F4, 0x10F5, 0x10F6, 0x10F7,
 950           0x10F8, 0x10F9, 0x10FA, 0x10FB, 0x10FC, 0x10FD, 0x10FE, 0x10FF,
 951
 952   // Table 7 (for high byte 0x20)
 953
 954   /* 0 */ 0x2000, 0x2001, 0x2002, 0x2003, 0x2004, 0x2005, 0x2006, 0x2007,
 955           0x2008, 0x2009, 0x200A, 0x200B, 0x0000, 0x0000, 0x0000, 0x0000,
 956   /* 1 */ 0x2010, 0x2011, 0x2012, 0x2013, 0x2014, 0x2015, 0x2016, 0x2017,
 957           0x2018, 0x2019, 0x201A, 0x201B, 0x201C, 0x201D, 0x201E, 0x201F,
 958   /* 2 */ 0x2020, 0x2021, 0x2022, 0x2023, 0x2024, 0x2025, 0x2026, 0x2027,
 959           0x2028, 0x2029, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x202F,
 960   /* 3 */ 0x2030, 0x2031, 0x2032, 0x2033, 0x2034, 0x2035, 0x2036, 0x2037,
 961           0x2038, 0x2039, 0x203A, 0x203B, 0x203C, 0x203D, 0x203E, 0x203F,
 962   /* 4 */ 0x2040, 0x2041, 0x2042, 0x2043, 0x2044, 0x2045, 0x2046, 0x2047,
 963           0x2048, 0x2049, 0x204A, 0x204B, 0x204C, 0x204D, 0x204E, 0x204F,
 964   /* 5 */ 0x2050, 0x2051, 0x2052, 0x2053, 0x2054, 0x2055, 0x2056, 0x2057,
 965           0x2058, 0x2059, 0x205A, 0x205B, 0x205C, 0x205D, 0x205E, 0x205F,
 966   /* 6 */ 0x2060, 0x2061, 0x2062, 0x2063, 0x2064, 0x2065, 0x2066, 0x2067,
 967           0x2068, 0x2069, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
 968   /* 7 */ 0x2070, 0x2071, 0x2072, 0x2073, 0x2074, 0x2075, 0x2076, 0x2077,
 969           0x2078, 0x2079, 0x207A, 0x207B, 0x207C, 0x207D, 0x207E, 0x207F,
 970   /* 8 */ 0x2080, 0x2081, 0x2082, 0x2083, 0x2084, 0x2085, 0x2086, 0x2087,
 971           0x2088, 0x2089, 0x208A, 0x208B, 0x208C, 0x208D, 0x208E, 0x208F,
 972   /* 9 */ 0x2090, 0x2091, 0x2092, 0x2093, 0x2094, 0x2095, 0x2096, 0x2097,
 973           0x2098, 0x2099, 0x209A, 0x209B, 0x209C, 0x209D, 0x209E, 0x209F,
 974   /* A */ 0x20A0, 0x20A1, 0x20A2, 0x20A3, 0x20A4, 0x20A5, 0x20A6, 0x20A7,
 975           0x20A8, 0x20A9, 0x20AA, 0x20AB, 0x20AC, 0x20AD, 0x20AE, 0x20AF,
 976   /* B */ 0x20B0, 0x20B1, 0x20B2, 0x20B3, 0x20B4, 0x20B5, 0x20B6, 0x20B7,
 977           0x20B8, 0x20B9, 0x20BA, 0x20BB, 0x20BC, 0x20BD, 0x20BE, 0x20BF,
 978   /* C */ 0x20C0, 0x20C1, 0x20C2, 0x20C3, 0x20C4, 0x20C5, 0x20C6, 0x20C7,
 979           0x20C8, 0x20C9, 0x20CA, 0x20CB, 0x20CC, 0x20CD, 0x20CE, 0x20CF,
 980   /* D */ 0x20D0, 0x20D1, 0x20D2, 0x20D3, 0x20D4, 0x20D5, 0x20D6, 0x20D7,
 981           0x20D8, 0x20D9, 0x20DA, 0x20DB, 0x20DC, 0x20DD, 0x20DE, 0x20DF,
 982   /* E */ 0x20E0, 0x20E1, 0x20E2, 0x20E3, 0x20E4, 0x20E5, 0x20E6, 0x20E7,
 983           0x20E8, 0x20E9, 0x20EA, 0x20EB, 0x20EC, 0x20ED, 0x20EE, 0x20EF,
 984   /* F */ 0x20F0, 0x20F1, 0x20F2, 0x20F3, 0x20F4, 0x20F5, 0x20F6, 0x20F7,
 985           0x20F8, 0x20F9, 0x20FA, 0x20FB, 0x20FC, 0x20FD, 0x20FE, 0x20FF,
 986
 987   // Table 8 (for high byte 0x21)
 988
 989   /* 0 */ 0x2100, 0x2101, 0x2102, 0x2103, 0x2104, 0x2105, 0x2106, 0x2107,
 990           0x2108, 0x2109, 0x210A, 0x210B, 0x210C, 0x210D, 0x210E, 0x210F,
 991   /* 1 */ 0x2110, 0x2111, 0x2112, 0x2113, 0x2114, 0x2115, 0x2116, 0x2117,
 992           0x2118, 0x2119, 0x211A, 0x211B, 0x211C, 0x211D, 0x211E, 0x211F,
 993   /* 2 */ 0x2120, 0x2121, 0x2122, 0x2123, 0x2124, 0x2125, 0x2126, 0x2127,
 994           0x2128, 0x2129, 0x212A, 0x212B, 0x212C, 0x212D, 0x212E, 0x212F,
 995   /* 3 */ 0x2130, 0x2131, 0x2132, 0x2133, 0x2134, 0x2135, 0x2136, 0x2137,
 996           0x2138, 0x2139, 0x213A, 0x213B, 0x213C, 0x213D, 0x213E, 0x213F,
 997   /* 4 */ 0x2140, 0x2141, 0x2142, 0x2143, 0x2144, 0x2145, 0x2146, 0x2147,
 998           0x2148, 0x2149, 0x214A, 0x214B, 0x214C, 0x214D, 0x214E, 0x214F,
 999   /* 5 */ 0x2150, 0x2151, 0x2152, 0x2153, 0x2154, 0x2155, 0x2156, 0x2157,
1000           0x2158, 0x2159, 0x215A, 0x215B, 0x215C, 0x215D, 0x215E, 0x215F,
1001   /* 6 */ 0x2170, 0x2171, 0x2172, 0x2173, 0x2174, 0x2175, 0x2176, 0x2177,
1002           0x2178, 0x2179, 0x217A, 0x217B, 0x217C, 0x217D, 0x217E, 0x217F,
1003   /* 7 */ 0x2170, 0x2171, 0x2172, 0x2173, 0x2174, 0x2175, 0x2176, 0x2177,
1004           0x2178, 0x2179, 0x217A, 0x217B, 0x217C, 0x217D, 0x217E, 0x217F,
1005   /* 8 */ 0x2180, 0x2181, 0x2182, 0x2183, 0x2184, 0x2185, 0x2186, 0x2187,
1006           0x2188, 0x2189, 0x218A, 0x218B, 0x218C, 0x218D, 0x218E, 0x218F,
1007   /* 9 */ 0x2190, 0x2191, 0x2192, 0x2193, 0x2194, 0x2195, 0x2196, 0x2197,
1008           0x2198, 0x2199, 0x219A, 0x219B, 0x219C, 0x219D, 0x219E, 0x219F,
1009   /* A */ 0x21A0, 0x21A1, 0x21A2, 0x21A3, 0x21A4, 0x21A5, 0x21A6, 0x21A7,
1010           0x21A8, 0x21A9, 0x21AA, 0x21AB, 0x21AC, 0x21AD, 0x21AE, 0x21AF,
1011   /* B */ 0x21B0, 0x21B1, 0x21B2, 0x21B3, 0x21B4, 0x21B5, 0x21B6, 0x21B7,
1012           0x21B8, 0x21B9, 0x21BA, 0x21BB, 0x21BC, 0x21BD, 0x21BE, 0x21BF,
1013   /* C */ 0x21C0, 0x21C1, 0x21C2, 0x21C3, 0x21C4, 0x21C5, 0x21C6, 0x21C7,
1014           0x21C8, 0x21C9, 0x21CA, 0x21CB, 0x21CC, 0x21CD, 0x21CE, 0x21CF,
1015   /* D */ 0x21D0, 0x21D1, 0x21D2, 0x21D3, 0x21D4, 0x21D5, 0x21D6, 0x21D7,
1016           0x21D8, 0x21D9, 0x21DA, 0x21DB, 0x21DC, 0x21DD, 0x21DE, 0x21DF,
1017   /* E */ 0x21E0, 0x21E1, 0x21E2, 0x21E3, 0x21E4, 0x21E5, 0x21E6, 0x21E7,
1018           0x21E8, 0x21E9, 0x21EA, 0x21EB, 0x21EC, 0x21ED, 0x21EE, 0x21EF,
1019   /* F */ 0x21F0, 0x21F1, 0x21F2, 0x21F3, 0x21F4, 0x21F5, 0x21F6, 0x21F7,
1020           0x21F8, 0x21F9, 0x21FA, 0x21FB, 0x21FC, 0x21FD, 0x21FE, 0x21FF,
1021
1022   // Table 9 (for high byte 0xFE)
1023
1024   /* 0 */ 0xFE00, 0xFE01, 0xFE02, 0xFE03, 0xFE04, 0xFE05, 0xFE06, 0xFE07,
1025           0xFE08, 0xFE09, 0xFE0A, 0xFE0B, 0xFE0C, 0xFE0D, 0xFE0E, 0xFE0F,
1026   /* 1 */ 0xFE10, 0xFE11, 0xFE12, 0xFE13, 0xFE14, 0xFE15, 0xFE16, 0xFE17,
1027           0xFE18, 0xFE19, 0xFE1A, 0xFE1B, 0xFE1C, 0xFE1D, 0xFE1E, 0xFE1F,
1028   /* 2 */ 0xFE20, 0xFE21, 0xFE22, 0xFE23, 0xFE24, 0xFE25, 0xFE26, 0xFE27,
1029           0xFE28, 0xFE29, 0xFE2A, 0xFE2B, 0xFE2C, 0xFE2D, 0xFE2E, 0xFE2F,
1030   /* 3 */ 0xFE30, 0xFE31, 0xFE32, 0xFE33, 0xFE34, 0xFE35, 0xFE36, 0xFE37,
1031           0xFE38, 0xFE39, 0xFE3A, 0xFE3B, 0xFE3C, 0xFE3D, 0xFE3E, 0xFE3F,
1032   /* 4 */ 0xFE40, 0xFE41, 0xFE42, 0xFE43, 0xFE44, 0xFE45, 0xFE46, 0xFE47,
1033           0xFE48, 0xFE49, 0xFE4A, 0xFE4B, 0xFE4C, 0xFE4D, 0xFE4E, 0xFE4F,
1034   /* 5 */ 0xFE50, 0xFE51, 0xFE52, 0xFE53, 0xFE54, 0xFE55, 0xFE56, 0xFE57,
1035           0xFE58, 0xFE59, 0xFE5A, 0xFE5B, 0xFE5C, 0xFE5D, 0xFE5E, 0xFE5F,
1036   /* 6 */ 0xFE60, 0xFE61, 0xFE62, 0xFE63, 0xFE64, 0xFE65, 0xFE66, 0xFE67,
1037           0xFE68, 0xFE69, 0xFE6A, 0xFE6B, 0xFE6C, 0xFE6D, 0xFE6E, 0xFE6F,
1038   /* 7 */ 0xFE70, 0xFE71, 0xFE72, 0xFE73, 0xFE74, 0xFE75, 0xFE76, 0xFE77,
1039           0xFE78, 0xFE79, 0xFE7A, 0xFE7B, 0xFE7C, 0xFE7D, 0xFE7E, 0xFE7F,
1040   /* 8 */ 0xFE80, 0xFE81, 0xFE82, 0xFE83, 0xFE84, 0xFE85, 0xFE86, 0xFE87,
1041           0xFE88, 0xFE89, 0xFE8A, 0xFE8B, 0xFE8C, 0xFE8D, 0xFE8E, 0xFE8F,
1042   /* 9 */ 0xFE90, 0xFE91, 0xFE92, 0xFE93, 0xFE94, 0xFE95, 0xFE96, 0xFE97,
1043           0xFE98, 0xFE99, 0xFE9A, 0xFE9B, 0xFE9C, 0xFE9D, 0xFE9E, 0xFE9F,
1044   /* A */ 0xFEA0, 0xFEA1, 0xFEA2, 0xFEA3, 0xFEA4, 0xFEA5, 0xFEA6, 0xFEA7,
1045           0xFEA8, 0xFEA9, 0xFEAA, 0xFEAB, 0xFEAC, 0xFEAD, 0xFEAE, 0xFEAF,
1046   /* B */ 0xFEB0, 0xFEB1, 0xFEB2, 0xFEB3, 0xFEB4, 0xFEB5, 0xFEB6, 0xFEB7,
1047           0xFEB8, 0xFEB9, 0xFEBA, 0xFEBB, 0xFEBC, 0xFEBD, 0xFEBE, 0xFEBF,
1048   /* C */ 0xFEC0, 0xFEC1, 0xFEC2, 0xFEC3, 0xFEC4, 0xFEC5, 0xFEC6, 0xFEC7,
1049           0xFEC8, 0xFEC9, 0xFECA, 0xFECB, 0xFECC, 0xFECD, 0xFECE, 0xFECF,
1050   /* D */ 0xFED0, 0xFED1, 0xFED2, 0xFED3, 0xFED4, 0xFED5, 0xFED6, 0xFED7,
1051           0xFED8, 0xFED9, 0xFEDA, 0xFEDB, 0xFEDC, 0xFEDD, 0xFEDE, 0xFEDF,
1052   /* E */ 0xFEE0, 0xFEE1, 0xFEE2, 0xFEE3, 0xFEE4, 0xFEE5, 0xFEE6, 0xFEE7,
1053           0xFEE8, 0xFEE9, 0xFEEA, 0xFEEB, 0xFEEC, 0xFEED, 0xFEEE, 0xFEEF,
1054   /* F */ 0xFEF0, 0xFEF1, 0xFEF2, 0xFEF3, 0xFEF4, 0xFEF5, 0xFEF6, 0xFEF7,
1055           0xFEF8, 0xFEF9, 0xFEFA, 0xFEFB, 0xFEFC, 0xFEFD, 0xFEFE, 0x0000,
1056
1057   // Table 10 (for high byte 0xFF)
1058
1059   /* 0 */ 0xFF00, 0xFF01, 0xFF02, 0xFF03, 0xFF04, 0xFF05, 0xFF06, 0xFF07,
1060           0xFF08, 0xFF09, 0xFF0A, 0xFF0B, 0xFF0C, 0xFF0D, 0xFF0E, 0xFF0F,
1061   /* 1 */ 0xFF10, 0xFF11, 0xFF12, 0xFF13, 0xFF14, 0xFF15, 0xFF16, 0xFF17,
1062           0xFF18, 0xFF19, 0xFF1A, 0xFF1B, 0xFF1C, 0xFF1D, 0xFF1E, 0xFF1F,
1063   /* 2 */ 0xFF20, 0xFF41, 0xFF42, 0xFF43, 0xFF44, 0xFF45, 0xFF46, 0xFF47,
1064           0xFF48, 0xFF49, 0xFF4A, 0xFF4B, 0xFF4C, 0xFF4D, 0xFF4E, 0xFF4F,
1065   /* 3 */ 0xFF50, 0xFF51, 0xFF52, 0xFF53, 0xFF54, 0xFF55, 0xFF56, 0xFF57,
1066           0xFF58, 0xFF59, 0xFF5A, 0xFF3B, 0xFF3C, 0xFF3D, 0xFF3E, 0xFF3F,
1067   /* 4 */ 0xFF40, 0xFF41, 0xFF42, 0xFF43, 0xFF44, 0xFF45, 0xFF46, 0xFF47,
1068           0xFF48, 0xFF49, 0xFF4A, 0xFF4B, 0xFF4C, 0xFF4D, 0xFF4E, 0xFF4F,
1069   /* 5 */ 0xFF50, 0xFF51, 0xFF52, 0xFF53, 0xFF54, 0xFF55, 0xFF56, 0xFF57,
1070           0xFF58, 0xFF59, 0xFF5A, 0xFF5B, 0xFF5C, 0xFF5D, 0xFF5E, 0xFF5F,
1071   /* 6 */ 0xFF60, 0xFF61, 0xFF62, 0xFF63, 0xFF64, 0xFF65, 0xFF66, 0xFF67,
1072           0xFF68, 0xFF69, 0xFF6A, 0xFF6B, 0xFF6C, 0xFF6D, 0xFF6E, 0xFF6F,
1073   /* 7 */ 0xFF70, 0xFF71, 0xFF72, 0xFF73, 0xFF74, 0xFF75, 0xFF76, 0xFF77,
1074           0xFF78, 0xFF79, 0xFF7A, 0xFF7B, 0xFF7C, 0xFF7D, 0xFF7E, 0xFF7F,
1075   /* 8 */ 0xFF80, 0xFF81, 0xFF82, 0xFF83, 0xFF84, 0xFF85, 0xFF86, 0xFF87,
1076           0xFF88, 0xFF89, 0xFF8A, 0xFF8B, 0xFF8C, 0xFF8D, 0xFF8E, 0xFF8F,
1077   /* 9 */ 0xFF90, 0xFF91, 0xFF92, 0xFF93, 0xFF94, 0xFF95, 0xFF96, 0xFF97,
1078           0xFF98, 0xFF99, 0xFF9A, 0xFF9B, 0xFF9C, 0xFF9D, 0xFF9E, 0xFF9F,
1079   /* A */ 0xFFA0, 0xFFA1, 0xFFA2, 0xFFA3, 0xFFA4, 0xFFA5, 0xFFA6, 0xFFA7,
1080           0xFFA8, 0xFFA9, 0xFFAA, 0xFFAB, 0xFFAC, 0xFFAD, 0xFFAE, 0xFFAF,
1081   /* B */ 0xFFB0, 0xFFB1, 0xFFB2, 0xFFB3, 0xFFB4, 0xFFB5, 0xFFB6, 0xFFB7,
1082           0xFFB8, 0xFFB9, 0xFFBA, 0xFFBB, 0xFFBC, 0xFFBD, 0xFFBE, 0xFFBF,
1083   /* C */ 0xFFC0, 0xFFC1, 0xFFC2, 0xFFC3, 0xFFC4, 0xFFC5, 0xFFC6, 0xFFC7,
1084           0xFFC8, 0xFFC9, 0xFFCA, 0xFFCB, 0xFFCC, 0xFFCD, 0xFFCE, 0xFFCF,
1085   /* D */ 0xFFD0, 0xFFD1, 0xFFD2, 0xFFD3, 0xFFD4, 0xFFD5, 0xFFD6, 0xFFD7,
1086           0xFFD8, 0xFFD9, 0xFFDA, 0xFFDB, 0xFFDC, 0xFFDD, 0xFFDE, 0xFFDF,
1087   /* E */ 0xFFE0, 0xFFE1, 0xFFE2, 0xFFE3, 0xFFE4, 0xFFE5, 0xFFE6, 0xFFE7,
1088           0xFFE8, 0xFFE9, 0xFFEA, 0xFFEB, 0xFFEC, 0xFFED, 0xFFEE, 0xFFEF,
1089   /* F */ 0xFFF0, 0xFFF1, 0xFFF2, 0xFFF3, 0xFFF4, 0xFFF5, 0xFFF6, 0xFFF7,
1090           0xFFF8, 0xFFF9, 0xFFFA, 0xFFFB, 0xFFFC, 0xFFFD, 0xFFFE, 0xFFFF,
1091 };
1092
1093 // Returns the next non-ignorable codepoint within string starting from the
1094 // position indicated by index, or zero if there are no more.
1095 // The passed-in index is automatically advanced as the characters in the input
1096 // HFS-decomposed UTF-8 strings are read.
1097 inline int HFSReadNextNonIgnorableCodepoint(const char* string,
1098                                             int length,
1099                                             int* index) {
1100   int codepoint = 0;
1101   while (*index < length && codepoint == 0) {
1102     // CBU8_NEXT returns a value < 0 in error cases. For purposes of string
1103     // comparison, we just use that value and flag it with DCHECK.
1104     CBU8_NEXT(string, *index, length, codepoint);
1105     DCHECK_GT(codepoint, 0);
1106     if (codepoint > 0) {
1107       // Check if there is a subtable for this upper byte.
1108       int lookup_offset = lower_case_table[codepoint >> 8];
1109       if (lookup_offset != 0)
1110         codepoint = lower_case_table[lookup_offset + (codepoint & 0x00FF)];
1111       // Note: codepoint1 may be again 0 at this point if the character was
1112       // an ignorable.
1113     }
1114   }
1115   return codepoint;
1116 }
1117
1118 }  // anonymous namespace
1119
1120 // Special UTF-8 version of FastUnicodeCompare. Cf:
1121 // http://developer.apple.com/mac/library/technotes/tn/tn1150.html#StringComparisonAlgorithm
1122 // The input strings must be in the special HFS decomposed form.
1123 int FilePath::HFSFastUnicodeCompare(const StringType& string1,
1124                                     const StringType& string2) {
1125   int length1 = string1.length();
1126   int length2 = string2.length();
1127   int index1 = 0;
1128   int index2 = 0;
1129
1130   for (;;) {
1131     int codepoint1 = HFSReadNextNonIgnorableCodepoint(string1.c_str(),
1132                                                       length1,
1133                                                       &index1);
1134     int codepoint2 = HFSReadNextNonIgnorableCodepoint(string2.c_str(),
1135                                                       length2,
1136                                                       &index2);
1137     if (codepoint1 != codepoint2)
1138       return (codepoint1 < codepoint2) ? -1 : 1;
1139     if (codepoint1 == 0) {
1140       DCHECK_EQ(index1, length1);
1141       DCHECK_EQ(index2, length2);
1142       return 0;
1143     }
1144   }
1145 }
1146
1147 StringType FilePath::GetHFSDecomposedForm(const StringType& string) {
1148   mac::ScopedCFTypeRef<CFStringRef> cfstring(
1149       CFStringCreateWithBytesNoCopy(
1150           NULL,
1151           reinterpret_cast<const UInt8*>(string.c_str()),
1152           string.length(),
1153           kCFStringEncodingUTF8,
1154           false,
1155           kCFAllocatorNull));
1156   // Query the maximum length needed to store the result. In most cases this
1157   // will overestimate the required space. The return value also already
1158   // includes the space needed for a terminating 0.
1159   CFIndex length = CFStringGetMaximumSizeOfFileSystemRepresentation(cfstring);
1160   DCHECK_GT(length, 0);  // should be at least 1 for the 0-terminator.
1161   // Reserve enough space for CFStringGetFileSystemRepresentation to write into.
1162   // Also set the length to the maximum so that we can shrink it later.
1163   // (Increasing rather than decreasing it would clobber the string contents!)
1164   StringType result;
1165   result.reserve(length);
1166   result.resize(length - 1);
1167   Boolean success = CFStringGetFileSystemRepresentation(cfstring,
1168                                                         &result[0],
1169                                                         length);
1170   if (success) {
1171     // Reduce result.length() to actual string length.
1172     result.resize(strlen(result.c_str()));
1173   } else {
1174     // An error occurred -> clear result.
1175     result.clear();
1176   }
1177   return result;
1178 }
1179
1180 int FilePath::CompareIgnoreCase(const StringType& string1,
1181                                 const StringType& string2) {
1182   // Quick checks for empty strings - these speed things up a bit and make the
1183   // following code cleaner.
1184   if (string1.empty())
1185     return string2.empty() ? 0 : -1;
1186   if (string2.empty())
1187     return 1;
1188
1189   StringType hfs1 = GetHFSDecomposedForm(string1);
1190   StringType hfs2 = GetHFSDecomposedForm(string2);
1191
1192   // GetHFSDecomposedForm() returns an empty string in an error case.
1193   if (hfs1.empty() || hfs2.empty()) {
1194     NOTREACHED();
1195     mac::ScopedCFTypeRef<CFStringRef> cfstring1(
1196         CFStringCreateWithBytesNoCopy(
1197             NULL,
1198             reinterpret_cast<const UInt8*>(string1.c_str()),
1199             string1.length(),
1200             kCFStringEncodingUTF8,
1201             false,
1202             kCFAllocatorNull));
1203     mac::ScopedCFTypeRef<CFStringRef> cfstring2(
1204         CFStringCreateWithBytesNoCopy(
1205             NULL,
1206             reinterpret_cast<const UInt8*>(string2.c_str()),
1207             string2.length(),
1208             kCFStringEncodingUTF8,
1209             false,
1210             kCFAllocatorNull));
1211     return CFStringCompare(cfstring1,
1212                            cfstring2,
1213                            kCFCompareCaseInsensitive);
1214   }
1215
1216   return HFSFastUnicodeCompare(hfs1, hfs2);
1217 }
1218
1219 #else  // << WIN. MACOSX | other (POSIX) >>
1220
1221 // Generic (POSIX) implementation of file string comparison.
1222 // TODO(rolandsteiner) check if this is sufficient/correct.
1223 int FilePath::CompareIgnoreCase(const StringType& string1,
1224                                 const StringType& string2) {
1225   int comparison = strcasecmp(string1.c_str(), string2.c_str());
1226   if (comparison < 0)
1227     return -1;
1228   if (comparison > 0)
1229     return 1;
1230   return 0;
1231 }
1232
1233 #endif  // OS versions of CompareIgnoreCase()
1234
1235
1236 void FilePath::StripTrailingSeparatorsInternal() {
1237   // If there is no drive letter, start will be 1, which will prevent stripping
1238   // the leading separator if there is only one separator.  If there is a drive
1239   // letter, start will be set appropriately to prevent stripping the first
1240   // separator following the drive letter, if a separator immediately follows
1241   // the drive letter.
1242   StringType::size_type start = FindDriveLetter(path_) + 2;
1243
1244   StringType::size_type last_stripped = StringType::npos;
1245   for (StringType::size_type pos = path_.length();
1246        pos > start && IsSeparator(path_[pos - 1]);
1247        --pos) {
1248     // If the string only has two separators and they're at the beginning,
1249     // don't strip them, unless the string began with more than two separators.
1250     if (pos != start + 1 || last_stripped == start + 2 ||
1251         !IsSeparator(path_[start - 1])) {
1252       path_.resize(pos - 1);
1253       last_stripped = pos;
1254     }
1255   }
1256 }
1257
1258 FilePath FilePath::NormalizePathSeparators() const {
1259 #if defined(FILE_PATH_USES_WIN_SEPARATORS)
1260   StringType copy = path_;
1261   for (size_t i = 1; i < kSeparatorsLength; ++i) {
1262     std::replace(copy.begin(), copy.end(), kSeparators[i], kSeparators[0]);
1263   }
1264   return FilePath(copy);
1265 #else
1266   return *this;
1267 #endif
1268 }
1269
1270 }  // namespace base
1271
1272 void PrintTo(const base::FilePath& path, std::ostream* out) {
1273   *out << path.value();
1274 }