Home | History | Annotate | Download | only in base
      1 // Copyright (c) 2010 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/file_path.h"
      6 
      7 #if defined(OS_MACOSX)
      8 #include <CoreServices/CoreServices.h>
      9 #endif
     10 
     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_piece.h"
     17 #include "base/string_util.h"
     18 #include "base/sys_string_conversions.h"
     19 
     20 #if defined(OS_MACOSX)
     21 #include "base/scoped_cftyperef.h"
     22 #include "base/third_party/icu/icu_utf.h"
     23 #endif
     24 #if defined(OS_WIN)
     25 #include "base/win_util.h"
     26 #endif
     27 
     28 #if defined(FILE_PATH_USES_WIN_SEPARATORS)
     29 const FilePath::CharType FilePath::kSeparators[] = FILE_PATH_LITERAL("\\/");
     30 #else  // FILE_PATH_USES_WIN_SEPARATORS
     31 const FilePath::CharType FilePath::kSeparators[] = FILE_PATH_LITERAL("/");
     32 #endif  // FILE_PATH_USES_WIN_SEPARATORS
     33 
     34 const FilePath::CharType FilePath::kCurrentDirectory[] = FILE_PATH_LITERAL(".");
     35 const FilePath::CharType FilePath::kParentDirectory[] = FILE_PATH_LITERAL("..");
     36 
     37 const FilePath::CharType FilePath::kExtensionSeparator = FILE_PATH_LITERAL('.');
     38 
     39 
     40 namespace {
     41 
     42 // If this FilePath contains a drive letter specification, returns the
     43 // position of the last character of the drive letter specification,
     44 // otherwise returns npos.  This can only be true on Windows, when a pathname
     45 // begins with a letter followed by a colon.  On other platforms, this always
     46 // returns npos.
     47 FilePath::StringType::size_type FindDriveLetter(
     48     const FilePath::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 FilePath::StringType::npos;
     59 }
     60 
     61 
     62 #if defined(FILE_PATH_USES_DRIVE_LETTERS)
     63 bool EqualDriveLetterCaseInsensitive(const FilePath::StringType a,
     64                                      const FilePath::StringType b) {
     65   size_t a_letter_pos = FindDriveLetter(a);
     66   size_t b_letter_pos = FindDriveLetter(b);
     67 
     68   if ((a_letter_pos == FilePath::StringType::npos) ||
     69       (b_letter_pos == FilePath::StringType::npos))
     70     return a == b;
     71 
     72   FilePath::StringType a_letter(a.substr(0, a_letter_pos + 1));
     73   FilePath::StringType b_letter(b.substr(0, b_letter_pos + 1));
     74   if (!StartsWith(a_letter, b_letter, false))
     75     return false;
     76 
     77   FilePath::StringType a_rest(a.substr(a_letter_pos + 1));
     78   FilePath::StringType b_rest(b.substr(b_letter_pos + 1));
     79   return a_rest == b_rest;
     80 }
     81 #endif  // defined(FILE_PATH_USES_DRIVE_LETTERS)
     82 
     83 bool IsPathAbsolute(const FilePath::StringType& path) {
     84 #if defined(FILE_PATH_USES_DRIVE_LETTERS)
     85   FilePath::StringType::size_type letter = FindDriveLetter(path);
     86   if (letter != FilePath::StringType::npos) {
     87     // Look for a separator right after the drive specification.
     88     return path.length() > letter + 1 &&
     89         FilePath::IsSeparator(path[letter + 1]);
     90   }
     91   // Look for a pair of leading separators.
     92   return path.length() > 1 &&
     93       FilePath::IsSeparator(path[0]) && FilePath::IsSeparator(path[1]);
     94 #else  // FILE_PATH_USES_DRIVE_LETTERS
     95   // Look for a separator in the first position.
     96   return path.length() > 0 && FilePath::IsSeparator(path[0]);
     97 #endif  // FILE_PATH_USES_DRIVE_LETTERS
     98 }
     99 
    100 bool AreAllSeparators(const FilePath::StringType& input) {
    101   for (FilePath::StringType::const_iterator it = input.begin();
    102       it != input.end(); ++it) {
    103     if (!FilePath::IsSeparator(*it))
    104       return false;
    105   }
    106 
    107   return true;
    108 }
    109 
    110 }  // namespace
    111 
    112 bool FilePath::IsSeparator(CharType character) {
    113   for (size_t i = 0; i < arraysize(kSeparators) - 1; ++i) {
    114     if (character == kSeparators[i]) {
    115       return true;
    116     }
    117   }
    118 
    119   return false;
    120 }
    121 
    122 void FilePath::GetComponents(std::vector<FilePath::StringType>* components)
    123     const {
    124   DCHECK(components);
    125   if (!components)
    126     return;
    127   components->clear();
    128   if (value().empty())
    129     return;
    130 
    131   std::vector<FilePath::StringType> ret_val;
    132   FilePath current = *this;
    133   FilePath base;
    134 
    135   // Capture path components.
    136   while (current != current.DirName()) {
    137     base = current.BaseName();
    138     if (!AreAllSeparators(base.value()))
    139       ret_val.push_back(base.value());
    140     current = current.DirName();
    141   }
    142 
    143   // Capture root, if any.
    144   base = current.BaseName();
    145   if (!base.value().empty() && base.value() != kCurrentDirectory)
    146     ret_val.push_back(current.BaseName().value());
    147 
    148   // Capture drive letter, if any.
    149   FilePath dir = current.DirName();
    150   StringType::size_type letter = FindDriveLetter(dir.value());
    151   if (letter != FilePath::StringType::npos) {
    152     ret_val.push_back(FilePath::StringType(dir.value(), 0, letter + 1));
    153   }
    154 
    155   *components = std::vector<FilePath::StringType>(ret_val.rbegin(),
    156                                                   ret_val.rend());
    157 }
    158 
    159 bool FilePath::operator==(const FilePath& that) const {
    160 #if defined(FILE_PATH_USES_DRIVE_LETTERS)
    161   return EqualDriveLetterCaseInsensitive(this->path_, that.path_);
    162 #else  // defined(FILE_PATH_USES_DRIVE_LETTERS)
    163   return path_ == that.path_;
    164 #endif  // defined(FILE_PATH_USES_DRIVE_LETTERS)
    165 }
    166 
    167 bool FilePath::operator!=(const FilePath& that) const {
    168 #if defined(FILE_PATH_USES_DRIVE_LETTERS)
    169   return !EqualDriveLetterCaseInsensitive(this->path_, that.path_);
    170 #else  // defined(FILE_PATH_USES_DRIVE_LETTERS)
    171   return path_ != that.path_;
    172 #endif  // defined(FILE_PATH_USES_DRIVE_LETTERS)
    173 }
    174 
    175 bool FilePath::IsParent(const FilePath& child) const {
    176   return AppendRelativePath(child, NULL);
    177 }
    178 
    179 bool FilePath::AppendRelativePath(const FilePath& child,
    180                                   FilePath* path) const {
    181   std::vector<FilePath::StringType> parent_components;
    182   std::vector<FilePath::StringType> child_components;
    183   GetComponents(&parent_components);
    184   child.GetComponents(&child_components);
    185 
    186   if (parent_components.size() >= child_components.size())
    187     return false;
    188   if (parent_components.size() == 0)
    189     return false;
    190 
    191   std::vector<FilePath::StringType>::const_iterator parent_comp =
    192       parent_components.begin();
    193   std::vector<FilePath::StringType>::const_iterator child_comp =
    194       child_components.begin();
    195 
    196 #if defined(FILE_PATH_USES_DRIVE_LETTERS)
    197   // Windows can access case sensitive filesystems, so component
    198   // comparisions must be case sensitive, but drive letters are
    199   // never case sensitive.
    200   if ((FindDriveLetter(*parent_comp) != FilePath::StringType::npos) &&
    201       (FindDriveLetter(*child_comp) != FilePath::StringType::npos)) {
    202     if (!StartsWith(*parent_comp, *child_comp, false))
    203       return false;
    204     ++parent_comp;
    205     ++child_comp;
    206   }
    207 #endif  // defined(FILE_PATH_USES_DRIVE_LETTERS)
    208 
    209   while (parent_comp != parent_components.end()) {
    210     if (*parent_comp != *child_comp)
    211       return false;
    212     ++parent_comp;
    213     ++child_comp;
    214   }
    215 
    216   if (path != NULL) {
    217     for (; child_comp != child_components.end(); ++child_comp) {
    218       *path = path->Append(*child_comp);
    219     }
    220   }
    221   return true;
    222 }
    223 
    224 // libgen's dirname and basename aren't guaranteed to be thread-safe and aren't
    225 // guaranteed to not modify their input strings, and in fact are implemented
    226 // differently in this regard on different platforms.  Don't use them, but
    227 // adhere to their behavior.
    228 FilePath FilePath::DirName() const {
    229   FilePath new_path(path_);
    230   new_path.StripTrailingSeparatorsInternal();
    231 
    232   // The drive letter, if any, always needs to remain in the output.  If there
    233   // is no drive letter, as will always be the case on platforms which do not
    234   // support drive letters, letter will be npos, or -1, so the comparisons and
    235   // resizes below using letter will still be valid.
    236   StringType::size_type letter = FindDriveLetter(new_path.path_);
    237 
    238   StringType::size_type last_separator =
    239       new_path.path_.find_last_of(kSeparators, StringType::npos,
    240                                   arraysize(kSeparators) - 1);
    241   if (last_separator == StringType::npos) {
    242     // path_ is in the current directory.
    243     new_path.path_.resize(letter + 1);
    244   } else if (last_separator == letter + 1) {
    245     // path_ is in the root directory.
    246     new_path.path_.resize(letter + 2);
    247   } else if (last_separator == letter + 2 &&
    248              IsSeparator(new_path.path_[letter + 1])) {
    249     // path_ is in "//" (possibly with a drive letter); leave the double
    250     // separator intact indicating alternate root.
    251     new_path.path_.resize(letter + 3);
    252   } else if (last_separator != 0) {
    253     // path_ is somewhere else, trim the basename.
    254     new_path.path_.resize(last_separator);
    255   }
    256 
    257   new_path.StripTrailingSeparatorsInternal();
    258   if (!new_path.path_.length())
    259     new_path.path_ = kCurrentDirectory;
    260 
    261   return new_path;
    262 }
    263 
    264 FilePath FilePath::BaseName() const {
    265   FilePath new_path(path_);
    266   new_path.StripTrailingSeparatorsInternal();
    267 
    268   // The drive letter, if any, is always stripped.
    269   StringType::size_type letter = FindDriveLetter(new_path.path_);
    270   if (letter != StringType::npos) {
    271     new_path.path_.erase(0, letter + 1);
    272   }
    273 
    274   // Keep everything after the final separator, but if the pathname is only
    275   // one character and it's a separator, leave it alone.
    276   StringType::size_type last_separator =
    277       new_path.path_.find_last_of(kSeparators, StringType::npos,
    278                                   arraysize(kSeparators) - 1);
    279   if (last_separator != StringType::npos &&
    280       last_separator < new_path.path_.length() - 1) {
    281     new_path.path_.erase(0, last_separator + 1);
    282   }
    283 
    284   return new_path;
    285 }
    286 
    287 FilePath::StringType FilePath::Extension() const {
    288   // BaseName() calls StripTrailingSeparators, so cases like /foo.baz/// work.
    289   StringType base = BaseName().value();
    290 
    291   // Special case "." and ".."
    292   if (base == kCurrentDirectory || base == kParentDirectory)
    293     return StringType();
    294 
    295   const StringType::size_type last_dot = base.rfind(kExtensionSeparator);
    296   if (last_dot == StringType::npos)
    297     return StringType();
    298   return StringType(base, last_dot);
    299 }
    300 
    301 FilePath FilePath::RemoveExtension() const {
    302   StringType ext = Extension();
    303   // It's important to check Extension() since that verifies that the
    304   // kExtensionSeparator actually appeared in the last path component.
    305   if (ext.empty())
    306     return FilePath(path_);
    307   // Since Extension() verified that the extension is in fact in the last path
    308   // component, this substr will effectively strip trailing separators.
    309   const StringType::size_type last_dot = path_.rfind(kExtensionSeparator);
    310   return FilePath(path_.substr(0, last_dot));
    311 }
    312 
    313 FilePath FilePath::InsertBeforeExtension(const StringType& suffix) const {
    314   if (suffix.empty())
    315     return FilePath(path_);
    316 
    317   if (path_.empty())
    318     return FilePath();
    319 
    320   StringType base = BaseName().value();
    321   if (base.empty())
    322     return FilePath();
    323   if (*(base.end() - 1) == kExtensionSeparator) {
    324     // Special case "." and ".."
    325     if (base == kCurrentDirectory || base == kParentDirectory) {
    326       return FilePath();
    327     }
    328   }
    329 
    330   StringType ext = Extension();
    331   StringType ret = RemoveExtension().value();
    332   ret.append(suffix);
    333   ret.append(ext);
    334   return FilePath(ret);
    335 }
    336 
    337 FilePath FilePath::InsertBeforeExtensionASCII(const base::StringPiece& suffix)
    338     const {
    339   DCHECK(IsStringASCII(suffix));
    340 #if defined(OS_WIN)
    341   return InsertBeforeExtension(ASCIIToWide(suffix));
    342 #elif defined(OS_POSIX)
    343   return InsertBeforeExtension(suffix.as_string());
    344 #endif
    345 }
    346 
    347 FilePath FilePath::ReplaceExtension(const StringType& extension) const {
    348   if (path_.empty())
    349     return FilePath();
    350 
    351   StringType base = BaseName().value();
    352   if (base.empty())
    353     return FilePath();
    354   if (*(base.end() - 1) == kExtensionSeparator) {
    355     // Special case "." and ".."
    356     if (base == kCurrentDirectory || base == kParentDirectory) {
    357       return FilePath();
    358     }
    359   }
    360 
    361   FilePath no_ext = RemoveExtension();
    362   // If the new extension is "" or ".", then just remove the current extension.
    363   if (extension.empty() || extension == StringType(1, kExtensionSeparator))
    364     return no_ext;
    365 
    366   StringType str = no_ext.value();
    367   if (extension[0] != kExtensionSeparator)
    368     str.append(1, kExtensionSeparator);
    369   str.append(extension);
    370   return FilePath(str);
    371 }
    372 
    373 bool FilePath::MatchesExtension(const StringType& extension) const {
    374   DCHECK(extension.empty() || extension[0] == kExtensionSeparator);
    375 
    376   FilePath::StringType current_extension = Extension();
    377 
    378   if (current_extension.length() != extension.length())
    379     return false;
    380 
    381   return FilePath::CompareEqualIgnoreCase(extension, current_extension);
    382 }
    383 
    384 FilePath FilePath::Append(const StringType& component) const {
    385   DCHECK(!IsPathAbsolute(component));
    386   if (path_.compare(kCurrentDirectory) == 0) {
    387     // Append normally doesn't do any normalization, but as a special case,
    388     // when appending to kCurrentDirectory, just return a new path for the
    389     // component argument.  Appending component to kCurrentDirectory would
    390     // serve no purpose other than needlessly lengthening the path, and
    391     // it's likely in practice to wind up with FilePath objects containing
    392     // only kCurrentDirectory when calling DirName on a single relative path
    393     // component.
    394     return FilePath(component);
    395   }
    396 
    397   FilePath new_path(path_);
    398   new_path.StripTrailingSeparatorsInternal();
    399 
    400   // Don't append a separator if the path is empty (indicating the current
    401   // directory) or if the path component is empty (indicating nothing to
    402   // append).
    403   if (component.length() > 0 && new_path.path_.length() > 0) {
    404     // Don't append a separator if the path still ends with a trailing
    405     // separator after stripping (indicating the root directory).
    406     if (!IsSeparator(new_path.path_[new_path.path_.length() - 1])) {
    407       // Don't append a separator if the path is just a drive letter.
    408       if (FindDriveLetter(new_path.path_) + 1 != new_path.path_.length()) {
    409         new_path.path_.append(1, kSeparators[0]);
    410       }
    411     }
    412   }
    413 
    414   new_path.path_.append(component);
    415   return new_path;
    416 }
    417 
    418 FilePath FilePath::Append(const FilePath& component) const {
    419   return Append(component.value());
    420 }
    421 
    422 FilePath FilePath::AppendASCII(const base::StringPiece& component) const {
    423   DCHECK(IsStringASCII(component));
    424 #if defined(OS_WIN)
    425   return Append(ASCIIToWide(component));
    426 #elif defined(OS_POSIX)
    427   return Append(component.as_string());
    428 #endif
    429 }
    430 
    431 bool FilePath::IsAbsolute() const {
    432   return IsPathAbsolute(path_);
    433 }
    434 
    435 #if defined(OS_WIN)
    436 // Windows specific implementation of file string comparisons
    437 
    438 int FilePath::CompareIgnoreCase(const StringType& string1,
    439                                 const StringType& string2) {
    440   // Perform character-wise upper case comparison rather than using the
    441   // fully Unicode-aware CompareString(). For details see:
    442   // http://blogs.msdn.com/michkap/archive/2005/10/17/481600.aspx
    443   StringType::const_iterator i1 = string1.begin();
    444   StringType::const_iterator i2 = string2.begin();
    445   StringType::const_iterator string1end = string1.end();
    446   StringType::const_iterator string2end = string2.end();
    447   for ( ; i1 != string1end && i2 != string2end; ++i1, ++i2) {
    448     wchar_t c1 = (wchar_t)LOWORD(::CharUpperW((LPWSTR)MAKELONG(*i1, 0)));
    449     wchar_t c2 = (wchar_t)LOWORD(::CharUpperW((LPWSTR)MAKELONG(*i2, 0)));
    450     if (c1 < c2)
    451       return -1;
    452     if (c1 > c2)
    453       return 1;
    454   }
    455   if (i1 != string1end)
    456     return 1;
    457   if (i2 != string2end)
    458     return -1;
    459   return 0;
    460 }
    461 
    462 #elif defined(OS_MACOSX)
    463 // Mac OS X specific implementation of file string comparisons
    464 
    465 // cf. http://developer.apple.com/mac/library/technotes/tn/tn1150.html#UnicodeSubtleties
    466 //
    467 // "When using CreateTextEncoding to create a text encoding, you should set
    468 // the TextEncodingBase to kTextEncodingUnicodeV2_0, set the
    469 // TextEncodingVariant to kUnicodeCanonicalDecompVariant, and set the
    470 // TextEncodingFormat to kUnicode16BitFormat. Using these values ensures that
    471 // the Unicode will be in the same form as on an HFS Plus volume, even as the
    472 // Unicode standard evolves."
    473 //
    474 // Another technical article for X 10.4 updates this: one should use
    475 // the new (unambiguous) kUnicodeHFSPlusDecompVariant.
    476 // cf. http://developer.apple.com/mac/library/releasenotes/TextFonts/RN-TEC/index.html
    477 //
    478 // This implementation uses CFStringGetFileSystemRepresentation() to get the
    479 // decomposed form, and an adapted version of the FastUnicodeCompare as
    480 // described in the tech note to compare the strings.
    481 
    482 // Character conversion table for FastUnicodeCompare()
    483 //
    484 // The lower case table consists of a 256-entry high-byte table followed by
    485 // some number of 256-entry subtables. The high-byte table contains either an
    486 // offset to the subtable for characters with that high byte or zero, which
    487 // means that there are no case mappings or ignored characters in that block.
    488 // Ignored characters are mapped to zero.
    489 //
    490 // cf. downloadable file linked in
    491 // http://developer.apple.com/mac/library/technotes/tn/tn1150.html#StringComparisonAlgorithm
    492 
    493 namespace {
    494 
    495 const UInt16 lower_case_table[] = {
    496   // High-byte indices ( == 0 iff no case mapping and no ignorables )
    497 
    498   /* 0 */ 0x0100, 0x0200, 0x0000, 0x0300, 0x0400, 0x0500, 0x0000, 0x0000,
    499           0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
    500   /* 1 */ 0x0600, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
    501           0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
    502   /* 2 */ 0x0700, 0x0800, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
    503           0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
    504   /* 3 */ 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
    505           0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
    506   /* 4 */ 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
    507           0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
    508   /* 5 */ 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
    509           0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
    510   /* 6 */ 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
    511           0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
    512   /* 7 */ 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
    513           0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
    514   /* 8 */ 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
    515           0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
    516   /* 9 */ 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
    517           0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
    518   /* A */ 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
    519           0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
    520   /* B */ 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
    521           0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
    522   /* C */ 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
    523           0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
    524   /* D */ 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
    525           0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
    526   /* E */ 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
    527           0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
    528   /* F */ 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
    529           0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0900, 0x0A00,
    530 
    531   // Table 1 (for high byte 0x00)
    532 
    533   /* 0 */ 0xFFFF, 0x0001, 0x0002, 0x0003, 0x0004, 0x0005, 0x0006, 0x0007,
    534           0x0008, 0x0009, 0x000A, 0x000B, 0x000C, 0x000D, 0x000E, 0x000F,
    535   /* 1 */ 0x0010, 0x0011, 0x0012, 0x0013, 0x0014, 0x0015, 0x0016, 0x0017,
    536           0x0018, 0x0019, 0x001A, 0x001B, 0x001C, 0x001D, 0x001E, 0x001F,
    537   /* 2 */ 0x0020, 0x0021, 0x0022, 0x0023, 0x0024, 0x0025, 0x0026, 0x0027,
    538           0x0028, 0x0029, 0x002A, 0x002B, 0x002C, 0x002D, 0x002E, 0x002F,
    539   /* 3 */ 0x0030, 0x0031, 0x0032, 0x0033, 0x0034, 0x0035, 0x0036, 0x0037,
    540           0x0038, 0x0039, 0x003A, 0x003B, 0x003C, 0x003D, 0x003E, 0x003F,
    541   /* 4 */ 0x0040, 0x0061, 0x0062, 0x0063, 0x0064, 0x0065, 0x0066, 0x0067,
    542           0x0068, 0x0069, 0x006A, 0x006B, 0x006C, 0x006D, 0x006E, 0x006F,
    543   /* 5 */ 0x0070, 0x0071, 0x0072, 0x0073, 0x0074, 0x0075, 0x0076, 0x0077,
    544           0x0078, 0x0079, 0x007A, 0x005B, 0x005C, 0x005D, 0x005E, 0x005F,
    545   /* 6 */ 0x0060, 0x0061, 0x0062, 0x0063, 0x0064, 0x0065, 0x0066, 0x0067,
    546           0x0068, 0x0069, 0x006A, 0x006B, 0x006C, 0x006D, 0x006E, 0x006F,
    547   /* 7 */ 0x0070, 0x0071, 0x0072, 0x0073, 0x0074, 0x0075, 0x0076, 0x0077,
    548           0x0078, 0x0079, 0x007A, 0x007B, 0x007C, 0x007D, 0x007E, 0x007F,
    549   /* 8 */ 0x0080, 0x0081, 0x0082, 0x0083, 0x0084, 0x0085, 0x0086, 0x0087,
    550           0x0088, 0x0089, 0x008A, 0x008B, 0x008C, 0x008D, 0x008E, 0x008F,
    551   /* 9 */ 0x0090, 0x0091, 0x0092, 0x0093, 0x0094, 0x0095, 0x0096, 0x0097,
    552           0x0098, 0x0099, 0x009A, 0x009B, 0x009C, 0x009D, 0x009E, 0x009F,
    553   /* A */ 0x00A0, 0x00A1, 0x00A2, 0x00A3, 0x00A4, 0x00A5, 0x00A6, 0x00A7,
    554           0x00A8, 0x00A9, 0x00AA, 0x00AB, 0x00AC, 0x00AD, 0x00AE, 0x00AF,
    555   /* B */ 0x00B0, 0x00B1, 0x00B2, 0x00B3, 0x00B4, 0x00B5, 0x00B6, 0x00B7,
    556           0x00B8, 0x00B9, 0x00BA, 0x00BB, 0x00BC, 0x00BD, 0x00BE, 0x00BF,
    557   /* C */ 0x00C0, 0x00C1, 0x00C2, 0x00C3, 0x00C4, 0x00C5, 0x00E6, 0x00C7,
    558           0x00C8, 0x00C9, 0x00CA, 0x00CB, 0x00CC, 0x00CD, 0x00CE, 0x00CF,
    559   /* D */ 0x00F0, 0x00D1, 0x00D2, 0x00D3, 0x00D4, 0x00D5, 0x00D6, 0x00D7,
    560           0x00F8, 0x00D9, 0x00DA, 0x00DB, 0x00DC, 0x00DD, 0x00FE, 0x00DF,
    561   /* E */ 0x00E0, 0x00E1, 0x00E2, 0x00E3, 0x00E4, 0x00E5, 0x00E6, 0x00E7,
    562           0x00E8, 0x00E9, 0x00EA, 0x00EB, 0x00EC, 0x00ED, 0x00EE, 0x00EF,
    563   /* F */ 0x00F0, 0x00F1, 0x00F2, 0x00F3, 0x00F4, 0x00F5, 0x00F6, 0x00F7,
    564           0x00F8, 0x00F9, 0x00FA, 0x00FB, 0x00FC, 0x00FD, 0x00FE, 0x00FF,
    565 
    566   // Table 2 (for high byte 0x01)
    567 
    568   /* 0 */ 0x0100, 0x0101, 0x0102, 0x0103, 0x0104, 0x0105, 0x0106, 0x0107,
    569           0x0108, 0x0109, 0x010A, 0x010B, 0x010C, 0x010D, 0x010E, 0x010F,
    570   /* 1 */ 0x0111, 0x0111, 0x0112, 0x0113, 0x0114, 0x0115, 0x0116, 0x0117,
    571           0x0118, 0x0119, 0x011A, 0x011B, 0x011C, 0x011D, 0x011E, 0x011F,
    572   /* 2 */ 0x0120, 0x0121, 0x0122, 0x0123, 0x0124, 0x0125, 0x0127, 0x0127,
    573           0x0128, 0x0129, 0x012A, 0x012B, 0x012C, 0x012D, 0x012E, 0x012F,
    574   /* 3 */ 0x0130, 0x0131, 0x0133, 0x0133, 0x0134, 0x0135, 0x0136, 0x0137,
    575           0x0138, 0x0139, 0x013A, 0x013B, 0x013C, 0x013D, 0x013E, 0x0140,
    576   /* 4 */ 0x0140, 0x0142, 0x0142, 0x0143, 0x0144, 0x0145, 0x0146, 0x0147,
    577           0x0148, 0x0149, 0x014B, 0x014B, 0x014C, 0x014D, 0x014E, 0x014F,
    578   /* 5 */ 0x0150, 0x0151, 0x0153, 0x0153, 0x0154, 0x0155, 0x0156, 0x0157,
    579           0x0158, 0x0159, 0x015A, 0x015B, 0x015C, 0x015D, 0x015E, 0x015F,
    580   /* 6 */ 0x0160, 0x0161, 0x0162, 0x0163, 0x0164, 0x0165, 0x0167, 0x0167,
    581           0x0168, 0x0169, 0x016A, 0x016B, 0x016C, 0x016D, 0x016E, 0x016F,
    582   /* 7 */ 0x0170, 0x0171, 0x0172, 0x0173, 0x0174, 0x0175, 0x0176, 0x0177,
    583           0x0178, 0x0179, 0x017A, 0x017B, 0x017C, 0x017D, 0x017E, 0x017F,
    584   /* 8 */ 0x0180, 0x0253, 0x0183, 0x0183, 0x0185, 0x0185, 0x0254, 0x0188,
    585           0x0188, 0x0256, 0x0257, 0x018C, 0x018C, 0x018D, 0x01DD, 0x0259,
    586   /* 9 */ 0x025B, 0x0192, 0x0192, 0x0260, 0x0263, 0x0195, 0x0269, 0x0268,
    587           0x0199, 0x0199, 0x019A, 0x019B, 0x026F, 0x0272, 0x019E, 0x0275,
    588   /* A */ 0x01A0, 0x01A1, 0x01A3, 0x01A3, 0x01A5, 0x01A5, 0x01A6, 0x01A8,
    589           0x01A8, 0x0283, 0x01AA, 0x01AB, 0x01AD, 0x01AD, 0x0288, 0x01AF,
    590   /* B */ 0x01B0, 0x028A, 0x028B, 0x01B4, 0x01B4, 0x01B6, 0x01B6, 0x0292,
    591           0x01B9, 0x01B9, 0x01BA, 0x01BB, 0x01BD, 0x01BD, 0x01BE, 0x01BF,
    592   /* C */ 0x01C0, 0x01C1, 0x01C2, 0x01C3, 0x01C6, 0x01C6, 0x01C6, 0x01C9,
    593           0x01C9, 0x01C9, 0x01CC, 0x01CC, 0x01CC, 0x01CD, 0x01CE, 0x01CF,
    594   /* D */ 0x01D0, 0x01D1, 0x01D2, 0x01D3, 0x01D4, 0x01D5, 0x01D6, 0x01D7,
    595           0x01D8, 0x01D9, 0x01DA, 0x01DB, 0x01DC, 0x01DD, 0x01DE, 0x01DF,
    596   /* E */ 0x01E0, 0x01E1, 0x01E2, 0x01E3, 0x01E5, 0x01E5, 0x01E6, 0x01E7,
    597           0x01E8, 0x01E9, 0x01EA, 0x01EB, 0x01EC, 0x01ED, 0x01EE, 0x01EF,
    598   /* F */ 0x01F0, 0x01F3, 0x01F3, 0x01F3, 0x01F4, 0x01F5, 0x01F6, 0x01F7,
    599           0x01F8, 0x01F9, 0x01FA, 0x01FB, 0x01FC, 0x01FD, 0x01FE, 0x01FF,
    600 
    601   // Table 3 (for high byte 0x03)
    602 
    603   /* 0 */ 0x0300, 0x0301, 0x0302, 0x0303, 0x0304, 0x0305, 0x0306, 0x0307,
    604           0x0308, 0x0309, 0x030A, 0x030B, 0x030C, 0x030D, 0x030E, 0x030F,
    605   /* 1 */ 0x0310, 0x0311, 0x0312, 0x0313, 0x0314, 0x0315, 0x0316, 0x0317,
    606           0x0318, 0x0319, 0x031A, 0x031B, 0x031C, 0x031D, 0x031E, 0x031F,
    607   /* 2 */ 0x0320, 0x0321, 0x0322, 0x0323, 0x0324, 0x0325, 0x0326, 0x0327,
    608           0x0328, 0x0329, 0x032A, 0x032B, 0x032C, 0x032D, 0x032E, 0x032F,
    609   /* 3 */ 0x0330, 0x0331, 0x0332, 0x0333, 0x0334, 0x0335, 0x0336, 0x0337,
    610           0x0338, 0x0339, 0x033A, 0x033B, 0x033C, 0x033D, 0x033E, 0x033F,
    611   /* 4 */ 0x0340, 0x0341, 0x0342, 0x0343, 0x0344, 0x0345, 0x0346, 0x0347,
    612           0x0348, 0x0349, 0x034A, 0x034B, 0x034C, 0x034D, 0x034E, 0x034F,
    613   /* 5 */ 0x0350, 0x0351, 0x0352, 0x0353, 0x0354, 0x0355, 0x0356, 0x0357,
    614           0x0358, 0x0359, 0x035A, 0x035B, 0x035C, 0x035D, 0x035E, 0x035F,
    615   /* 6 */ 0x0360, 0x0361, 0x0362, 0x0363, 0x0364, 0x0365, 0x0366, 0x0367,
    616           0x0368, 0x0369, 0x036A, 0x036B, 0x036C, 0x036D, 0x036E, 0x036F,
    617   /* 7 */ 0x0370, 0x0371, 0x0372, 0x0373, 0x0374, 0x0375, 0x0376, 0x0377,
    618           0x0378, 0x0379, 0x037A, 0x037B, 0x037C, 0x037D, 0x037E, 0x037F,
    619   /* 8 */ 0x0380, 0x0381, 0x0382, 0x0383, 0x0384, 0x0385, 0x0386, 0x0387,
    620           0x0388, 0x0389, 0x038A, 0x038B, 0x038C, 0x038D, 0x038E, 0x038F,
    621   /* 9 */ 0x0390, 0x03B1, 0x03B2, 0x03B3, 0x03B4, 0x03B5, 0x03B6, 0x03B7,
    622           0x03B8, 0x03B9, 0x03BA, 0x03BB, 0x03BC, 0x03BD, 0x03BE, 0x03BF,
    623   /* A */ 0x03C0, 0x03C1, 0x03A2, 0x03C3, 0x03C4, 0x03C5, 0x03C6, 0x03C7,
    624           0x03C8, 0x03C9, 0x03AA, 0x03AB, 0x03AC, 0x03AD, 0x03AE, 0x03AF,
    625   /* B */ 0x03B0, 0x03B1, 0x03B2, 0x03B3, 0x03B4, 0x03B5, 0x03B6, 0x03B7,
    626           0x03B8, 0x03B9, 0x03BA, 0x03BB, 0x03BC, 0x03BD, 0x03BE, 0x03BF,
    627   /* C */ 0x03C0, 0x03C1, 0x03C2, 0x03C3, 0x03C4, 0x03C5, 0x03C6, 0x03C7,
    628           0x03C8, 0x03C9, 0x03CA, 0x03CB, 0x03CC, 0x03CD, 0x03CE, 0x03CF,
    629   /* D */ 0x03D0, 0x03D1, 0x03D2, 0x03D3, 0x03D4, 0x03D5, 0x03D6, 0x03D7,
    630           0x03D8, 0x03D9, 0x03DA, 0x03DB, 0x03DC, 0x03DD, 0x03DE, 0x03DF,
    631   /* E */ 0x03E0, 0x03E1, 0x03E3, 0x03E3, 0x03E5, 0x03E5, 0x03E7, 0x03E7,
    632           0x03E9, 0x03E9, 0x03EB, 0x03EB, 0x03ED, 0x03ED, 0x03EF, 0x03EF,
    633   /* F */ 0x03F0, 0x03F1, 0x03F2, 0x03F3, 0x03F4, 0x03F5, 0x03F6, 0x03F7,
    634           0x03F8, 0x03F9, 0x03FA, 0x03FB, 0x03FC, 0x03FD, 0x03FE, 0x03FF,
    635 
    636   // Table 4 (for high byte 0x04)
    637 
    638   /* 0 */ 0x0400, 0x0401, 0x0452, 0x0403, 0x0454, 0x0455, 0x0456, 0x0407,
    639           0x0458, 0x0459, 0x045A, 0x045B, 0x040C, 0x040D, 0x040E, 0x045F,
    640   /* 1 */ 0x0430, 0x0431, 0x0432, 0x0433, 0x0434, 0x0435, 0x0436, 0x0437,
    641           0x0438, 0x0419, 0x043A, 0x043B, 0x043C, 0x043D, 0x043E, 0x043F,
    642   /* 2 */ 0x0440, 0x0441, 0x0442, 0x0443, 0x0444, 0x0445, 0x0446, 0x0447,
    643           0x0448, 0x0449, 0x044A, 0x044B, 0x044C, 0x044D, 0x044E, 0x044F,
    644   /* 3 */ 0x0430, 0x0431, 0x0432, 0x0433, 0x0434, 0x0435, 0x0436, 0x0437,
    645           0x0438, 0x0439, 0x043A, 0x043B, 0x043C, 0x043D, 0x043E, 0x043F,
    646   /* 4 */ 0x0440, 0x0441, 0x0442, 0x0443, 0x0444, 0x0445, 0x0446, 0x0447,
    647           0x0448, 0x0449, 0x044A, 0x044B, 0x044C, 0x044D, 0x044E, 0x044F,
    648   /* 5 */ 0x0450, 0x0451, 0x0452, 0x0453, 0x0454, 0x0455, 0x0456, 0x0457,
    649           0x0458, 0x0459, 0x045A, 0x045B, 0x045C, 0x045D, 0x045E, 0x045F,
    650   /* 6 */ 0x0461, 0x0461, 0x0463, 0x0463, 0x0465, 0x0465, 0x0467, 0x0467,
    651           0x0469, 0x0469, 0x046B, 0x046B, 0x046D, 0x046D, 0x046F, 0x046F,
    652   /* 7 */ 0x0471, 0x0471, 0x0473, 0x0473, 0x0475, 0x0475, 0x0476, 0x0477,
    653           0x0479, 0x0479, 0x047B, 0x047B, 0x047D, 0x047D, 0x047F, 0x047F,
    654   /* 8 */ 0x0481, 0x0481, 0x0482, 0x0483, 0x0484, 0x0485, 0x0486, 0x0487,
    655           0x0488, 0x0489, 0x048A, 0x048B, 0x048C, 0x048D, 0x048E, 0x048F,
    656   /* 9 */ 0x0491, 0x0491, 0x0493, 0x0493, 0x0495, 0x0495, 0x0497, 0x0497,
    657           0x0499, 0x0499, 0x049B, 0x049B, 0x049D, 0x049D, 0x049F, 0x049F,
    658   /* A */ 0x04A1, 0x04A1, 0x04A3, 0x04A3, 0x04A5, 0x04A5, 0x04A7, 0x04A7,
    659           0x04A9, 0x04A9, 0x04AB, 0x04AB, 0x04AD, 0x04AD, 0x04AF, 0x04AF,
    660   /* B */ 0x04B1, 0x04B1, 0x04B3, 0x04B3, 0x04B5, 0x04B5, 0x04B7, 0x04B7,
    661           0x04B9, 0x04B9, 0x04BB, 0x04BB, 0x04BD, 0x04BD, 0x04BF, 0x04BF,
    662   /* C */ 0x04C0, 0x04C1, 0x04C2, 0x04C4, 0x04C4, 0x04C5, 0x04C6, 0x04C8,
    663           0x04C8, 0x04C9, 0x04CA, 0x04CC, 0x04CC, 0x04CD, 0x04CE, 0x04CF,
    664   /* D */ 0x04D0, 0x04D1, 0x04D2, 0x04D3, 0x04D4, 0x04D5, 0x04D6, 0x04D7,
    665           0x04D8, 0x04D9, 0x04DA, 0x04DB, 0x04DC, 0x04DD, 0x04DE, 0x04DF,
    666   /* E */ 0x04E0, 0x04E1, 0x04E2, 0x04E3, 0x04E4, 0x04E5, 0x04E6, 0x04E7,
    667           0x04E8, 0x04E9, 0x04EA, 0x04EB, 0x04EC, 0x04ED, 0x04EE, 0x04EF,
    668   /* F */ 0x04F0, 0x04F1, 0x04F2, 0x04F3, 0x04F4, 0x04F5, 0x04F6, 0x04F7,
    669           0x04F8, 0x04F9, 0x04FA, 0x04FB, 0x04FC, 0x04FD, 0x04FE, 0x04FF,
    670 
    671   // Table 5 (for high byte 0x05)
    672 
    673   /* 0 */ 0x0500, 0x0501, 0x0502, 0x0503, 0x0504, 0x0505, 0x0506, 0x0507,
    674           0x0508, 0x0509, 0x050A, 0x050B, 0x050C, 0x050D, 0x050E, 0x050F,
    675   /* 1 */ 0x0510, 0x0511, 0x0512, 0x0513, 0x0514, 0x0515, 0x0516, 0x0517,
    676           0x0518, 0x0519, 0x051A, 0x051B, 0x051C, 0x051D, 0x051E, 0x051F,
    677   /* 2 */ 0x0520, 0x0521, 0x0522, 0x0523, 0x0524, 0x0525, 0x0526, 0x0527,
    678           0x0528, 0x0529, 0x052A, 0x052B, 0x052C, 0x052D, 0x052E, 0x052F,
    679   /* 3 */ 0x0530, 0x0561, 0x0562, 0x0563, 0x0564, 0x0565, 0x0566, 0x0567,
    680           0x0568, 0x0569, 0x056A, 0x056B, 0x056C, 0x056D, 0x056E, 0x056F,
    681   /* 4 */ 0x0570, 0x0571, 0x0572, 0x0573, 0x0574, 0x0575, 0x0576, 0x0577,
    682           0x0578, 0x0579, 0x057A, 0x057B, 0x057C, 0x057D, 0x057E, 0x057F,
    683   /* 5 */ 0x0580, 0x0581, 0x0582, 0x0583, 0x0584, 0x0585, 0x0586, 0x0557,
    684           0x0558, 0x0559, 0x055A, 0x055B, 0x055C, 0x055D, 0x055E, 0x055F,
    685   /* 6 */ 0x0560, 0x0561, 0x0562, 0x0563, 0x0564, 0x0565, 0x0566, 0x0567,
    686           0x0568, 0x0569, 0x056A, 0x056B, 0x056C, 0x056D, 0x056E, 0x056F,
    687   /* 7 */ 0x0570, 0x0571, 0x0572, 0x0573, 0x0574, 0x0575, 0x0576, 0x0577,
    688           0x0578, 0x0579, 0x057A, 0x057B, 0x057C, 0x057D, 0x057E, 0x057F,
    689   /* 8 */ 0x0580, 0x0581, 0x0582, 0x0583, 0x0584, 0x0585, 0x0586, 0x0587,
    690           0x0588, 0x0589, 0x058A, 0x058B, 0x058C, 0x058D, 0x058E, 0x058F,
    691   /* 9 */ 0x0590, 0x0591, 0x0592, 0x0593, 0x0594, 0x0595, 0x0596, 0x0597,
    692           0x0598, 0x0599, 0x059A, 0x059B, 0x059C, 0x059D, 0x059E, 0x059F,
    693   /* A */ 0x05A0, 0x05A1, 0x05A2, 0x05A3, 0x05A4, 0x05A5, 0x05A6, 0x05A7,
    694           0x05A8, 0x05A9, 0x05AA, 0x05AB, 0x05AC, 0x05AD, 0x05AE, 0x05AF,
    695   /* B */ 0x05B0, 0x05B1, 0x05B2, 0x05B3, 0x05B4, 0x05B5, 0x05B6, 0x05B7,
    696           0x05B8, 0x05B9, 0x05BA, 0x05BB, 0x05BC, 0x05BD, 0x05BE, 0x05BF,
    697   /* C */ 0x05C0, 0x05C1, 0x05C2, 0x05C3, 0x05C4, 0x05C5, 0x05C6, 0x05C7,
    698           0x05C8, 0x05C9, 0x05CA, 0x05CB, 0x05CC, 0x05CD, 0x05CE, 0x05CF,
    699   /* D */ 0x05D0, 0x05D1, 0x05D2, 0x05D3, 0x05D4, 0x05D5, 0x05D6, 0x05D7,
    700           0x05D8, 0x05D9, 0x05DA, 0x05DB, 0x05DC, 0x05DD, 0x05DE, 0x05DF,
    701   /* E */ 0x05E0, 0x05E1, 0x05E2, 0x05E3, 0x05E4, 0x05E5, 0x05E6, 0x05E7,
    702           0x05E8, 0x05E9, 0x05EA, 0x05EB, 0x05EC, 0x05ED, 0x05EE, 0x05EF,
    703   /* F */ 0x05F0, 0x05F1, 0x05F2, 0x05F3, 0x05F4, 0x05F5, 0x05F6, 0x05F7,
    704           0x05F8, 0x05F9, 0x05FA, 0x05FB, 0x05FC, 0x05FD, 0x05FE, 0x05FF,
    705 
    706   // Table 6 (for high byte 0x10)
    707 
    708   /* 0 */ 0x1000, 0x1001, 0x1002, 0x1003, 0x1004, 0x1005, 0x1006, 0x1007,
    709           0x1008, 0x1009, 0x100A, 0x100B, 0x100C, 0x100D, 0x100E, 0x100F,
    710   /* 1 */ 0x1010, 0x1011, 0x1012, 0x1013, 0x1014, 0x1015, 0x1016, 0x1017,
    711           0x1018, 0x1019, 0x101A, 0x101B, 0x101C, 0x101D, 0x101E, 0x101F,
    712   /* 2 */ 0x1020, 0x1021, 0x1022, 0x1023, 0x1024, 0x1025, 0x1026, 0x1027,
    713           0x1028, 0x1029, 0x102A, 0x102B, 0x102C, 0x102D, 0x102E, 0x102F,
    714   /* 3 */ 0x1030, 0x1031, 0x1032, 0x1033, 0x1034, 0x1035, 0x1036, 0x1037,
    715           0x1038, 0x1039, 0x103A, 0x103B, 0x103C, 0x103D, 0x103E, 0x103F,
    716   /* 4 */ 0x1040, 0x1041, 0x1042, 0x1043, 0x1044, 0x1045, 0x1046, 0x1047,
    717           0x1048, 0x1049, 0x104A, 0x104B, 0x104C, 0x104D, 0x104E, 0x104F,
    718   /* 5 */ 0x1050, 0x1051, 0x1052, 0x1053, 0x1054, 0x1055, 0x1056, 0x1057,
    719           0x1058, 0x1059, 0x105A, 0x105B, 0x105C, 0x105D, 0x105E, 0x105F,
    720   /* 6 */ 0x1060, 0x1061, 0x1062, 0x1063, 0x1064, 0x1065, 0x1066, 0x1067,
    721           0x1068, 0x1069, 0x106A, 0x106B, 0x106C, 0x106D, 0x106E, 0x106F,
    722   /* 7 */ 0x1070, 0x1071, 0x1072, 0x1073, 0x1074, 0x1075, 0x1076, 0x1077,
    723           0x1078, 0x1079, 0x107A, 0x107B, 0x107C, 0x107D, 0x107E, 0x107F,
    724   /* 8 */ 0x1080, 0x1081, 0x1082, 0x1083, 0x1084, 0x1085, 0x1086, 0x1087,
    725           0x1088, 0x1089, 0x108A, 0x108B, 0x108C, 0x108D, 0x108E, 0x108F,
    726   /* 9 */ 0x1090, 0x1091, 0x1092, 0x1093, 0x1094, 0x1095, 0x1096, 0x1097,
    727           0x1098, 0x1099, 0x109A, 0x109B, 0x109C, 0x109D, 0x109E, 0x109F,
    728   /* A */ 0x10D0, 0x10D1, 0x10D2, 0x10D3, 0x10D4, 0x10D5, 0x10D6, 0x10D7,
    729           0x10D8, 0x10D9, 0x10DA, 0x10DB, 0x10DC, 0x10DD, 0x10DE, 0x10DF,
    730   /* B */ 0x10E0, 0x10E1, 0x10E2, 0x10E3, 0x10E4, 0x10E5, 0x10E6, 0x10E7,
    731           0x10E8, 0x10E9, 0x10EA, 0x10EB, 0x10EC, 0x10ED, 0x10EE, 0x10EF,
    732   /* C */ 0x10F0, 0x10F1, 0x10F2, 0x10F3, 0x10F4, 0x10F5, 0x10C6, 0x10C7,
    733           0x10C8, 0x10C9, 0x10CA, 0x10CB, 0x10CC, 0x10CD, 0x10CE, 0x10CF,
    734   /* D */ 0x10D0, 0x10D1, 0x10D2, 0x10D3, 0x10D4, 0x10D5, 0x10D6, 0x10D7,
    735           0x10D8, 0x10D9, 0x10DA, 0x10DB, 0x10DC, 0x10DD, 0x10DE, 0x10DF,
    736   /* E */ 0x10E0, 0x10E1, 0x10E2, 0x10E3, 0x10E4, 0x10E5, 0x10E6, 0x10E7,
    737           0x10E8, 0x10E9, 0x10EA, 0x10EB, 0x10EC, 0x10ED, 0x10EE, 0x10EF,
    738   /* F */ 0x10F0, 0x10F1, 0x10F2, 0x10F3, 0x10F4, 0x10F5, 0x10F6, 0x10F7,
    739           0x10F8, 0x10F9, 0x10FA, 0x10FB, 0x10FC, 0x10FD, 0x10FE, 0x10FF,
    740 
    741   // Table 7 (for high byte 0x20)
    742 
    743   /* 0 */ 0x2000, 0x2001, 0x2002, 0x2003, 0x2004, 0x2005, 0x2006, 0x2007,
    744           0x2008, 0x2009, 0x200A, 0x200B, 0x0000, 0x0000, 0x0000, 0x0000,
    745   /* 1 */ 0x2010, 0x2011, 0x2012, 0x2013, 0x2014, 0x2015, 0x2016, 0x2017,
    746           0x2018, 0x2019, 0x201A, 0x201B, 0x201C, 0x201D, 0x201E, 0x201F,
    747   /* 2 */ 0x2020, 0x2021, 0x2022, 0x2023, 0x2024, 0x2025, 0x2026, 0x2027,
    748           0x2028, 0x2029, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x202F,
    749   /* 3 */ 0x2030, 0x2031, 0x2032, 0x2033, 0x2034, 0x2035, 0x2036, 0x2037,
    750           0x2038, 0x2039, 0x203A, 0x203B, 0x203C, 0x203D, 0x203E, 0x203F,
    751   /* 4 */ 0x2040, 0x2041, 0x2042, 0x2043, 0x2044, 0x2045, 0x2046, 0x2047,
    752           0x2048, 0x2049, 0x204A, 0x204B, 0x204C, 0x204D, 0x204E, 0x204F,
    753   /* 5 */ 0x2050, 0x2051, 0x2052, 0x2053, 0x2054, 0x2055, 0x2056, 0x2057,
    754           0x2058, 0x2059, 0x205A, 0x205B, 0x205C, 0x205D, 0x205E, 0x205F,
    755   /* 6 */ 0x2060, 0x2061, 0x2062, 0x2063, 0x2064, 0x2065, 0x2066, 0x2067,
    756           0x2068, 0x2069, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
    757   /* 7 */ 0x2070, 0x2071, 0x2072, 0x2073, 0x2074, 0x2075, 0x2076, 0x2077,
    758           0x2078, 0x2079, 0x207A, 0x207B, 0x207C, 0x207D, 0x207E, 0x207F,
    759   /* 8 */ 0x2080, 0x2081, 0x2082, 0x2083, 0x2084, 0x2085, 0x2086, 0x2087,
    760           0x2088, 0x2089, 0x208A, 0x208B, 0x208C, 0x208D, 0x208E, 0x208F,
    761   /* 9 */ 0x2090, 0x2091, 0x2092, 0x2093, 0x2094, 0x2095, 0x2096, 0x2097,
    762           0x2098, 0x2099, 0x209A, 0x209B, 0x209C, 0x209D, 0x209E, 0x209F,
    763   /* A */ 0x20A0, 0x20A1, 0x20A2, 0x20A3, 0x20A4, 0x20A5, 0x20A6, 0x20A7,
    764           0x20A8, 0x20A9, 0x20AA, 0x20AB, 0x20AC, 0x20AD, 0x20AE, 0x20AF,
    765   /* B */ 0x20B0, 0x20B1, 0x20B2, 0x20B3, 0x20B4, 0x20B5, 0x20B6, 0x20B7,
    766           0x20B8, 0x20B9, 0x20BA, 0x20BB, 0x20BC, 0x20BD, 0x20BE, 0x20BF,
    767   /* C */ 0x20C0, 0x20C1, 0x20C2, 0x20C3, 0x20C4, 0x20C5, 0x20C6, 0x20C7,
    768           0x20C8, 0x20C9, 0x20CA, 0x20CB, 0x20CC, 0x20CD, 0x20CE, 0x20CF,
    769   /* D */ 0x20D0, 0x20D1, 0x20D2, 0x20D3, 0x20D4, 0x20D5, 0x20D6, 0x20D7,
    770           0x20D8, 0x20D9, 0x20DA, 0x20DB, 0x20DC, 0x20DD, 0x20DE, 0x20DF,
    771   /* E */ 0x20E0, 0x20E1, 0x20E2, 0x20E3, 0x20E4, 0x20E5, 0x20E6, 0x20E7,
    772           0x20E8, 0x20E9, 0x20EA, 0x20EB, 0x20EC, 0x20ED, 0x20EE, 0x20EF,
    773   /* F */ 0x20F0, 0x20F1, 0x20F2, 0x20F3, 0x20F4, 0x20F5, 0x20F6, 0x20F7,
    774           0x20F8, 0x20F9, 0x20FA, 0x20FB, 0x20FC, 0x20FD, 0x20FE, 0x20FF,
    775 
    776   // Table 8 (for high byte 0x21)
    777 
    778   /* 0 */ 0x2100, 0x2101, 0x2102, 0x2103, 0x2104, 0x2105, 0x2106, 0x2107,
    779           0x2108, 0x2109, 0x210A, 0x210B, 0x210C, 0x210D, 0x210E, 0x210F,
    780   /* 1 */ 0x2110, 0x2111, 0x2112, 0x2113, 0x2114, 0x2115, 0x2116, 0x2117,
    781           0x2118, 0x2119, 0x211A, 0x211B, 0x211C, 0x211D, 0x211E, 0x211F,
    782   /* 2 */ 0x2120, 0x2121, 0x2122, 0x2123, 0x2124, 0x2125, 0x2126, 0x2127,
    783           0x2128, 0x2129, 0x212A, 0x212B, 0x212C, 0x212D, 0x212E, 0x212F,
    784   /* 3 */ 0x2130, 0x2131, 0x2132, 0x2133, 0x2134, 0x2135, 0x2136, 0x2137,
    785           0x2138, 0x2139, 0x213A, 0x213B, 0x213C, 0x213D, 0x213E, 0x213F,
    786   /* 4 */ 0x2140, 0x2141, 0x2142, 0x2143, 0x2144, 0x2145, 0x2146, 0x2147,
    787           0x2148, 0x2149, 0x214A, 0x214B, 0x214C, 0x214D, 0x214E, 0x214F,
    788   /* 5 */ 0x2150, 0x2151, 0x2152, 0x2153, 0x2154, 0x2155, 0x2156, 0x2157,
    789           0x2158, 0x2159, 0x215A, 0x215B, 0x215C, 0x215D, 0x215E, 0x215F,
    790   /* 6 */ 0x2170, 0x2171, 0x2172, 0x2173, 0x2174, 0x2175, 0x2176, 0x2177,
    791           0x2178, 0x2179, 0x217A, 0x217B, 0x217C, 0x217D, 0x217E, 0x217F,
    792   /* 7 */ 0x2170, 0x2171, 0x2172, 0x2173, 0x2174, 0x2175, 0x2176, 0x2177,
    793           0x2178, 0x2179, 0x217A, 0x217B, 0x217C, 0x217D, 0x217E, 0x217F,
    794   /* 8 */ 0x2180, 0x2181, 0x2182, 0x2183, 0x2184, 0x2185, 0x2186, 0x2187,
    795           0x2188, 0x2189, 0x218A, 0x218B, 0x218C, 0x218D, 0x218E, 0x218F,
    796   /* 9 */ 0x2190, 0x2191, 0x2192, 0x2193, 0x2194, 0x2195, 0x2196, 0x2197,
    797           0x2198, 0x2199, 0x219A, 0x219B, 0x219C, 0x219D, 0x219E, 0x219F,
    798   /* A */ 0x21A0, 0x21A1, 0x21A2, 0x21A3, 0x21A4, 0x21A5, 0x21A6, 0x21A7,
    799           0x21A8, 0x21A9, 0x21AA, 0x21AB, 0x21AC, 0x21AD, 0x21AE, 0x21AF,
    800   /* B */ 0x21B0, 0x21B1, 0x21B2, 0x21B3, 0x21B4, 0x21B5, 0x21B6, 0x21B7,
    801           0x21B8, 0x21B9, 0x21BA, 0x21BB, 0x21BC, 0x21BD, 0x21BE, 0x21BF,
    802   /* C */ 0x21C0, 0x21C1, 0x21C2, 0x21C3, 0x21C4, 0x21C5, 0x21C6, 0x21C7,
    803           0x21C8, 0x21C9, 0x21CA, 0x21CB, 0x21CC, 0x21CD, 0x21CE, 0x21CF,
    804   /* D */ 0x21D0, 0x21D1, 0x21D2, 0x21D3, 0x21D4, 0x21D5, 0x21D6, 0x21D7,
    805           0x21D8, 0x21D9, 0x21DA, 0x21DB, 0x21DC, 0x21DD, 0x21DE, 0x21DF,
    806   /* E */ 0x21E0, 0x21E1, 0x21E2, 0x21E3, 0x21E4, 0x21E5, 0x21E6, 0x21E7,
    807           0x21E8, 0x21E9, 0x21EA, 0x21EB, 0x21EC, 0x21ED, 0x21EE, 0x21EF,
    808   /* F */ 0x21F0, 0x21F1, 0x21F2, 0x21F3, 0x21F4, 0x21F5, 0x21F6, 0x21F7,
    809           0x21F8, 0x21F9, 0x21FA, 0x21FB, 0x21FC, 0x21FD, 0x21FE, 0x21FF,
    810 
    811   // Table 9 (for high byte 0xFE)
    812 
    813   /* 0 */ 0xFE00, 0xFE01, 0xFE02, 0xFE03, 0xFE04, 0xFE05, 0xFE06, 0xFE07,
    814           0xFE08, 0xFE09, 0xFE0A, 0xFE0B, 0xFE0C, 0xFE0D, 0xFE0E, 0xFE0F,
    815   /* 1 */ 0xFE10, 0xFE11, 0xFE12, 0xFE13, 0xFE14, 0xFE15, 0xFE16, 0xFE17,
    816           0xFE18, 0xFE19, 0xFE1A, 0xFE1B, 0xFE1C, 0xFE1D, 0xFE1E, 0xFE1F,
    817   /* 2 */ 0xFE20, 0xFE21, 0xFE22, 0xFE23, 0xFE24, 0xFE25, 0xFE26, 0xFE27,
    818           0xFE28, 0xFE29, 0xFE2A, 0xFE2B, 0xFE2C, 0xFE2D, 0xFE2E, 0xFE2F,
    819   /* 3 */ 0xFE30, 0xFE31, 0xFE32, 0xFE33, 0xFE34, 0xFE35, 0xFE36, 0xFE37,
    820           0xFE38, 0xFE39, 0xFE3A, 0xFE3B, 0xFE3C, 0xFE3D, 0xFE3E, 0xFE3F,
    821   /* 4 */ 0xFE40, 0xFE41, 0xFE42, 0xFE43, 0xFE44, 0xFE45, 0xFE46, 0xFE47,
    822           0xFE48, 0xFE49, 0xFE4A, 0xFE4B, 0xFE4C, 0xFE4D, 0xFE4E, 0xFE4F,
    823   /* 5 */ 0xFE50, 0xFE51, 0xFE52, 0xFE53, 0xFE54, 0xFE55, 0xFE56, 0xFE57,
    824           0xFE58, 0xFE59, 0xFE5A, 0xFE5B, 0xFE5C, 0xFE5D, 0xFE5E, 0xFE5F,
    825   /* 6 */ 0xFE60, 0xFE61, 0xFE62, 0xFE63, 0xFE64, 0xFE65, 0xFE66, 0xFE67,
    826           0xFE68, 0xFE69, 0xFE6A, 0xFE6B, 0xFE6C, 0xFE6D, 0xFE6E, 0xFE6F,
    827   /* 7 */ 0xFE70, 0xFE71, 0xFE72, 0xFE73, 0xFE74, 0xFE75, 0xFE76, 0xFE77,
    828           0xFE78, 0xFE79, 0xFE7A, 0xFE7B, 0xFE7C, 0xFE7D, 0xFE7E, 0xFE7F,
    829   /* 8 */ 0xFE80, 0xFE81, 0xFE82, 0xFE83, 0xFE84, 0xFE85, 0xFE86, 0xFE87,
    830           0xFE88, 0xFE89, 0xFE8A, 0xFE8B, 0xFE8C, 0xFE8D, 0xFE8E, 0xFE8F,
    831   /* 9 */ 0xFE90, 0xFE91, 0xFE92, 0xFE93, 0xFE94, 0xFE95, 0xFE96, 0xFE97,
    832           0xFE98, 0xFE99, 0xFE9A, 0xFE9B, 0xFE9C, 0xFE9D, 0xFE9E, 0xFE9F,
    833   /* A */ 0xFEA0, 0xFEA1, 0xFEA2, 0xFEA3, 0xFEA4, 0xFEA5, 0xFEA6, 0xFEA7,
    834           0xFEA8, 0xFEA9, 0xFEAA, 0xFEAB, 0xFEAC, 0xFEAD, 0xFEAE, 0xFEAF,
    835   /* B */ 0xFEB0, 0xFEB1, 0xFEB2, 0xFEB3, 0xFEB4, 0xFEB5, 0xFEB6, 0xFEB7,
    836           0xFEB8, 0xFEB9, 0xFEBA, 0xFEBB, 0xFEBC, 0xFEBD, 0xFEBE, 0xFEBF,
    837   /* C */ 0xFEC0, 0xFEC1, 0xFEC2, 0xFEC3, 0xFEC4, 0xFEC5, 0xFEC6, 0xFEC7,
    838           0xFEC8, 0xFEC9, 0xFECA, 0xFECB, 0xFECC, 0xFECD, 0xFECE, 0xFECF,
    839   /* D */ 0xFED0, 0xFED1, 0xFED2, 0xFED3, 0xFED4, 0xFED5, 0xFED6, 0xFED7,
    840           0xFED8, 0xFED9, 0xFEDA, 0xFEDB, 0xFEDC, 0xFEDD, 0xFEDE, 0xFEDF,
    841   /* E */ 0xFEE0, 0xFEE1, 0xFEE2, 0xFEE3, 0xFEE4, 0xFEE5, 0xFEE6, 0xFEE7,
    842           0xFEE8, 0xFEE9, 0xFEEA, 0xFEEB, 0xFEEC, 0xFEED, 0xFEEE, 0xFEEF,
    843   /* F */ 0xFEF0, 0xFEF1, 0xFEF2, 0xFEF3, 0xFEF4, 0xFEF5, 0xFEF6, 0xFEF7,
    844           0xFEF8, 0xFEF9, 0xFEFA, 0xFEFB, 0xFEFC, 0xFEFD, 0xFEFE, 0x0000,
    845 
    846   // Table 10 (for high byte 0xFF)
    847 
    848   /* 0 */ 0xFF00, 0xFF01, 0xFF02, 0xFF03, 0xFF04, 0xFF05, 0xFF06, 0xFF07,
    849           0xFF08, 0xFF09, 0xFF0A, 0xFF0B, 0xFF0C, 0xFF0D, 0xFF0E, 0xFF0F,
    850   /* 1 */ 0xFF10, 0xFF11, 0xFF12, 0xFF13, 0xFF14, 0xFF15, 0xFF16, 0xFF17,
    851           0xFF18, 0xFF19, 0xFF1A, 0xFF1B, 0xFF1C, 0xFF1D, 0xFF1E, 0xFF1F,
    852   /* 2 */ 0xFF20, 0xFF41, 0xFF42, 0xFF43, 0xFF44, 0xFF45, 0xFF46, 0xFF47,
    853           0xFF48, 0xFF49, 0xFF4A, 0xFF4B, 0xFF4C, 0xFF4D, 0xFF4E, 0xFF4F,
    854   /* 3 */ 0xFF50, 0xFF51, 0xFF52, 0xFF53, 0xFF54, 0xFF55, 0xFF56, 0xFF57,
    855           0xFF58, 0xFF59, 0xFF5A, 0xFF3B, 0xFF3C, 0xFF3D, 0xFF3E, 0xFF3F,
    856   /* 4 */ 0xFF40, 0xFF41, 0xFF42, 0xFF43, 0xFF44, 0xFF45, 0xFF46, 0xFF47,
    857           0xFF48, 0xFF49, 0xFF4A, 0xFF4B, 0xFF4C, 0xFF4D, 0xFF4E, 0xFF4F,
    858   /* 5 */ 0xFF50, 0xFF51, 0xFF52, 0xFF53, 0xFF54, 0xFF55, 0xFF56, 0xFF57,
    859           0xFF58, 0xFF59, 0xFF5A, 0xFF5B, 0xFF5C, 0xFF5D, 0xFF5E, 0xFF5F,
    860   /* 6 */ 0xFF60, 0xFF61, 0xFF62, 0xFF63, 0xFF64, 0xFF65, 0xFF66, 0xFF67,
    861           0xFF68, 0xFF69, 0xFF6A, 0xFF6B, 0xFF6C, 0xFF6D, 0xFF6E, 0xFF6F,
    862   /* 7 */ 0xFF70, 0xFF71, 0xFF72, 0xFF73, 0xFF74, 0xFF75, 0xFF76, 0xFF77,
    863           0xFF78, 0xFF79, 0xFF7A, 0xFF7B, 0xFF7C, 0xFF7D, 0xFF7E, 0xFF7F,
    864   /* 8 */ 0xFF80, 0xFF81, 0xFF82, 0xFF83, 0xFF84, 0xFF85, 0xFF86, 0xFF87,
    865           0xFF88, 0xFF89, 0xFF8A, 0xFF8B, 0xFF8C, 0xFF8D, 0xFF8E, 0xFF8F,
    866   /* 9 */ 0xFF90, 0xFF91, 0xFF92, 0xFF93, 0xFF94, 0xFF95, 0xFF96, 0xFF97,
    867           0xFF98, 0xFF99, 0xFF9A, 0xFF9B, 0xFF9C, 0xFF9D, 0xFF9E, 0xFF9F,
    868   /* A */ 0xFFA0, 0xFFA1, 0xFFA2, 0xFFA3, 0xFFA4, 0xFFA5, 0xFFA6, 0xFFA7,
    869           0xFFA8, 0xFFA9, 0xFFAA, 0xFFAB, 0xFFAC, 0xFFAD, 0xFFAE, 0xFFAF,
    870   /* B */ 0xFFB0, 0xFFB1, 0xFFB2, 0xFFB3, 0xFFB4, 0xFFB5, 0xFFB6, 0xFFB7,
    871           0xFFB8, 0xFFB9, 0xFFBA, 0xFFBB, 0xFFBC, 0xFFBD, 0xFFBE, 0xFFBF,
    872   /* C */ 0xFFC0, 0xFFC1, 0xFFC2, 0xFFC3, 0xFFC4, 0xFFC5, 0xFFC6, 0xFFC7,
    873           0xFFC8, 0xFFC9, 0xFFCA, 0xFFCB, 0xFFCC, 0xFFCD, 0xFFCE, 0xFFCF,
    874   /* D */ 0xFFD0, 0xFFD1, 0xFFD2, 0xFFD3, 0xFFD4, 0xFFD5, 0xFFD6, 0xFFD7,
    875           0xFFD8, 0xFFD9, 0xFFDA, 0xFFDB, 0xFFDC, 0xFFDD, 0xFFDE, 0xFFDF,
    876   /* E */ 0xFFE0, 0xFFE1, 0xFFE2, 0xFFE3, 0xFFE4, 0xFFE5, 0xFFE6, 0xFFE7,
    877           0xFFE8, 0xFFE9, 0xFFEA, 0xFFEB, 0xFFEC, 0xFFED, 0xFFEE, 0xFFEF,
    878   /* F */ 0xFFF0, 0xFFF1, 0xFFF2, 0xFFF3, 0xFFF4, 0xFFF5, 0xFFF6, 0xFFF7,
    879           0xFFF8, 0xFFF9, 0xFFFA, 0xFFFB, 0xFFFC, 0xFFFD, 0xFFFE, 0xFFFF,
    880 };
    881 
    882 // Returns the next non-ignorable codepoint within string starting from the
    883 // position indicated by index, or zero if there are no more.
    884 // The passed-in index is automatically advanced as the characters in the input
    885 // HFS-decomposed UTF-8 strings are read.
    886 inline int HFSReadNextNonIgnorableCodepoint(const char* string,
    887                                             int length,
    888                                             int* index) {
    889   int codepoint = 0;
    890   while (*index < length && codepoint == 0) {
    891     // CBU8_NEXT returns a value < 0 in error cases. For purposes of string
    892     // comparison, we just use that value and flag it with DCHECK.
    893     CBU8_NEXT(string, *index, length, codepoint);
    894     DCHECK_GT(codepoint, 0);
    895     if (codepoint > 0) {
    896       // Check if there is a subtable for this upper byte.
    897       int lookup_offset = lower_case_table[codepoint >> 8];
    898       if (lookup_offset != 0)
    899         codepoint = lower_case_table[lookup_offset + (codepoint & 0x00FF)];
    900       // Note: codepoint1 may be again 0 at this point if the character was
    901       // an ignorable.
    902     }
    903   }
    904   return codepoint;
    905 }
    906 
    907 }  // anonymous namespace
    908 
    909 // Special UTF-8 version of FastUnicodeCompare. Cf:
    910 // http://developer.apple.com/mac/library/technotes/tn/tn1150.html#StringComparisonAlgorithm
    911 // The input strings must be in the special HFS decomposed form.
    912 int FilePath::HFSFastUnicodeCompare(const StringType& string1,
    913                                     const StringType& string2) {
    914   int length1 = string1.length();
    915   int length2 = string2.length();
    916   int index1 = 0;
    917   int index2 = 0;
    918 
    919   for (;;) {
    920     int codepoint1 = HFSReadNextNonIgnorableCodepoint(string1.c_str(),
    921                                                       length1,
    922                                                       &index1);
    923     int codepoint2 = HFSReadNextNonIgnorableCodepoint(string2.c_str(),
    924                                                       length2,
    925                                                       &index2);
    926     if (codepoint1 != codepoint2)
    927       return (codepoint1 < codepoint2) ? -1 : 1;
    928     if (codepoint1 == 0) {
    929       DCHECK_EQ(index1, length1);
    930       DCHECK_EQ(index2, length2);
    931       return 0;
    932     }
    933   }
    934 }
    935 
    936 FilePath::StringType FilePath::GetHFSDecomposedForm(const StringType& string) {
    937   scoped_cftyperef<CFStringRef> cfstring(
    938       CFStringCreateWithBytesNoCopy(
    939           NULL,
    940           reinterpret_cast<const UInt8*>(string.c_str()),
    941           string.length(),
    942           kCFStringEncodingUTF8,
    943           false,
    944           kCFAllocatorNull));
    945   // Query the maximum length needed to store the result. In most cases this
    946   // will overestimate the required space. The return value also already
    947   // includes the space needed for a terminating 0.
    948   CFIndex length = CFStringGetMaximumSizeOfFileSystemRepresentation(cfstring);
    949   DCHECK_GT(length, 0);  // should be at least 1 for the 0-terminator.
    950   // Reserve enough space for CFStringGetFileSystemRepresentation to write into.
    951   // Also set the length to the maximum so that we can shrink it later.
    952   // (Increasing rather than decreasing it would clobber the string contents!)
    953   StringType result;
    954   result.reserve(length);
    955   result.resize(length - 1);
    956   Boolean success = CFStringGetFileSystemRepresentation(cfstring,
    957                                                         &result[0],
    958                                                         length);
    959   if (success) {
    960     // Reduce result.length() to actual string length.
    961     result.resize(strlen(result.c_str()));
    962   } else {
    963     // An error occurred -> clear result.
    964     result.clear();
    965   }
    966   return result;
    967 }
    968 
    969 int FilePath::CompareIgnoreCase(const StringType& string1,
    970                                 const StringType& string2) {
    971   // Quick checks for empty strings - these speed things up a bit and make the
    972   // following code cleaner.
    973   if (string1.empty())
    974     return string2.empty() ? 0 : -1;
    975   if (string2.empty())
    976     return 1;
    977 
    978   StringType hfs1 = GetHFSDecomposedForm(string1);
    979   StringType hfs2 = GetHFSDecomposedForm(string2);
    980 
    981   // GetHFSDecomposedForm() returns an empty string in an error case.
    982   if (hfs1.empty() || hfs2.empty()) {
    983     NOTREACHED();
    984     scoped_cftyperef<CFStringRef> cfstring1(
    985         CFStringCreateWithBytesNoCopy(
    986             NULL,
    987             reinterpret_cast<const UInt8*>(string1.c_str()),
    988             string1.length(),
    989             kCFStringEncodingUTF8,
    990             false,
    991             kCFAllocatorNull));
    992     scoped_cftyperef<CFStringRef> cfstring2(
    993         CFStringCreateWithBytesNoCopy(
    994             NULL,
    995             reinterpret_cast<const UInt8*>(string2.c_str()),
    996             string2.length(),
    997             kCFStringEncodingUTF8,
    998             false,
    999             kCFAllocatorNull));
   1000     return CFStringCompare(cfstring1,
   1001                            cfstring2,
   1002                            kCFCompareCaseInsensitive);
   1003   }
   1004 
   1005   return HFSFastUnicodeCompare(hfs1, hfs2);
   1006 }
   1007 
   1008 #else  // << WIN. MACOSX | other (POSIX) >>
   1009 
   1010 // Generic (POSIX) implementation of file string comparison.
   1011 // TODO(rolandsteiner) check if this is sufficient/correct.
   1012 int FilePath::CompareIgnoreCase(const StringType& string1,
   1013                                 const StringType& string2) {
   1014   int comparison = strcasecmp(string1.c_str(), string2.c_str());
   1015   if (comparison < 0)
   1016     return -1;
   1017   if (comparison > 0)
   1018     return 1;
   1019   return 0;
   1020 }
   1021 
   1022 #endif  // OS versions of CompareIgnoreCase()
   1023 
   1024 #if defined(OS_POSIX)
   1025 
   1026 // See file_path.h for a discussion of the encoding of paths on POSIX
   1027 // platforms.  These *Hack() functions are not quite correct, but they're
   1028 // only temporary while we fix the remainder of the code.
   1029 // Remember to remove the #includes at the top when you remove these.
   1030 
   1031 // static
   1032 FilePath FilePath::FromWStringHack(const std::wstring& wstring) {
   1033   return FilePath(base::SysWideToNativeMB(wstring));
   1034 }
   1035 std::wstring FilePath::ToWStringHack() const {
   1036   return base::SysNativeMBToWide(path_);
   1037 }
   1038 #elif defined(OS_WIN)
   1039 // static
   1040 FilePath FilePath::FromWStringHack(const std::wstring& wstring) {
   1041   return FilePath(wstring);
   1042 }
   1043 std::wstring FilePath::ToWStringHack() const {
   1044   return path_;
   1045 }
   1046 #endif
   1047 
   1048 FilePath FilePath::StripTrailingSeparators() const {
   1049   FilePath new_path(path_);
   1050   new_path.StripTrailingSeparatorsInternal();
   1051 
   1052   return new_path;
   1053 }
   1054 
   1055 // static.
   1056 void FilePath::WriteStringTypeToPickle(Pickle* pickle,
   1057                                        const FilePath::StringType& path) {
   1058 #if defined(WCHAR_T_IS_UTF16)
   1059   pickle->WriteWString(path);
   1060 #elif defined(WCHAR_T_IS_UTF32)
   1061   pickle->WriteString(path);
   1062 #else
   1063   NOTIMPLEMENTED() << "Impossible encoding situation!";
   1064 #endif
   1065 }
   1066 
   1067 // static.
   1068 bool FilePath::ReadStringTypeFromPickle(Pickle* pickle, void** iter,
   1069                                         FilePath::StringType* path) {
   1070 #if defined(WCHAR_T_IS_UTF16)
   1071   if (!pickle->ReadWString(iter, path))
   1072     return false;
   1073 #elif defined(WCHAR_T_IS_UTF32)
   1074   if (!pickle->ReadString(iter, path))
   1075     return false;
   1076 #else
   1077   NOTIMPLEMENTED() << "Impossible encoding situation!";
   1078   return false;
   1079 #endif
   1080 
   1081   return true;
   1082 }
   1083 
   1084 void FilePath::WriteToPickle(Pickle* pickle) {
   1085   WriteStringTypeToPickle(pickle, value());
   1086 }
   1087 
   1088 bool FilePath::ReadFromPickle(Pickle* pickle, void** iter) {
   1089   return ReadStringTypeFromPickle(pickle, iter, &path_);
   1090 }
   1091 
   1092 void FilePath::StripTrailingSeparatorsInternal() {
   1093   // If there is no drive letter, start will be 1, which will prevent stripping
   1094   // the leading separator if there is only one separator.  If there is a drive
   1095   // letter, start will be set appropriately to prevent stripping the first
   1096   // separator following the drive letter, if a separator immediately follows
   1097   // the drive letter.
   1098   StringType::size_type start = FindDriveLetter(path_) + 2;
   1099 
   1100   StringType::size_type last_stripped = StringType::npos;
   1101   for (StringType::size_type pos = path_.length();
   1102        pos > start && IsSeparator(path_[pos - 1]);
   1103        --pos) {
   1104     // If the string only has two separators and they're at the beginning,
   1105     // don't strip them, unless the string began with more than two separators.
   1106     if (pos != start + 1 || last_stripped == start + 2 ||
   1107         !IsSeparator(path_[start - 1])) {
   1108       path_.resize(pos - 1);
   1109       last_stripped = pos;
   1110     }
   1111   }
   1112 }
   1113 
   1114 bool FilePath::ReferencesParent() const {
   1115   std::vector<FilePath::StringType> components;
   1116   GetComponents(&components);
   1117 
   1118   std::vector<FilePath::StringType>::const_iterator it = components.begin();
   1119   for (; it != components.end(); ++it) {
   1120     const FilePath::StringType& component = *it;
   1121     if (component == kParentDirectory)
   1122       return true;
   1123   }
   1124   return false;
   1125 }
   1126 
   1127