String cleanup in sync code

chrome/browser/sync/util/path_helpers.cc

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/sync/util/path_helpers.h"
 
-#include <Shlwapi.h>
-#include <stdlib.h>
-
-#include "base/logging.h"
-#include "base/port.h"
-#include "build/build_config.h"
-#include "chrome/browser/sync/syncable/syncable.h"
-
-#ifndef OS_WIN
-#error Compile this file on Windows only.
-#endif
-
-using std::string;
-
-#if OS_WIN
-const char PATH_SEPARATOR = '\\';
-#else
-const char PATH_SEPARATOR = '/';
-#endif  // OS_WIN
-
-
-static PathString RemoveTrailingSlashes16(PathString str) {
-  while ((str.length() > 0) && (str.at(str.length() - 1) == kPathSeparator[0]))
-    str.resize(str.length() - 1);
-  return str;
-}
-
-static string RemoveTrailingSlashes(string str) {
-  while ((str.length() > 0) && (str.at(str.length() - 1) == PATH_SEPARATOR))
-    str.resize(str.length() - 1);
-  return str;
-}
-
-PathString LastPathSegment(const PathString& path) {
-  return RemoveTrailingSlashes16(PathFindFileNameW(path.c_str()));
-}
-
-string LastPathSegment(const string& path) {
-  return RemoveTrailingSlashes(PathFindFileNameA(path.c_str()));
-}
-
-PathString GetFullPath(const PathString& path) {
-  PathChar buffer[MAX_PATH];
-  PathChar* file_part;
-  DWORD const size = GetFullPathName(path.c_str(), ARRAYSIZE(buffer), buffer,
-                                     &file_part);
-  return PathString(buffer, size);
-}
-
-PathString AppendSlash(const PathString& path) {
-  PathString result(path);
-  if (!result.empty()) {
-    if (*result.rbegin() == '/')
-      *result.rbegin() = '\\';
-    else if (*result.rbegin() != '\\')
-      result.push_back('\\');
-  }
-  return result;
-}
-
-PathString ExpandTilde(const PathString& path) {
-  // Do nothing on windows.
-  return path;
-}
-
-// Returns a string with length or fewer elements, careful to not truncate a
-// string mid-surrogate pair.
-PathString TruncatePathString(const PathString& original, int length) {
-  if (original.size() <= static_cast<size_t>(length))
-    return original;
-  if (length <= 0)
-    return original;
-  PathString ret(original.begin(), original.begin() + length);
-  COMPILE_ASSERT(sizeof(PathChar) == sizeof(uint16), PathStringNotUTF16);
-  PathChar last_char = *ret.rbegin();
-
-  // Values taken from
-  // http://en.wikipedia.org/w/index.php?title=UTF-16/UCS-2&oldid=248072840
-  if (last_char >= 0xD800 && last_char <= 0xDBFF)
-    ret.resize(ret.size() - 1);
-  return ret;
-}
-
-namespace {
-const PathString kWindowsIllegalBaseFilenames[] = {
-    L"CON", L"PRN", L"AUX", L"NUL", L"COM1", L"COM2",
-    L"COM3", L"COM4", L"COM5", L"COM6", L"COM7",
-    L"COM8", L"COM9", L"LPT1", L"LPT2", L"LPT3",
-    L"LPT4", L"LPT5", L"LPT6", L"LPT7", L"LPT8",
-    L"LPT9" };
-}
-
-// See: http://msdn.microsoft.com/library/default.asp?url=/library/
-// en-us/fileio/fs/naming_a_file.asp
-// note that * and ? are not listed on the page as illegal characters,
-// but they are.
-PathString MakePathComponentOSLegal(const PathString& component) {
-  CHECK(!component.empty());
-  PathString mutable_component = component;
-
-  // Remove illegal characters.
-  for (PathString::iterator i = mutable_component.begin();
-       i != mutable_component.end();) {
-    if ((PathString::npos != PathString(L"<>:\"/\\|*?").find(*i)) ||
-        ((static_cast<unsigned short>(*i) >= 0) &&
-         (static_cast<unsigned short>(*i) <= 31))) {
-      mutable_component.erase(i);
-    } else {
-      ++i;
-    }
-  }
-
-  // Remove trailing spaces or periods.
-  while (mutable_component.size() &&
-         ((mutable_component.at(mutable_component.size() - 1) == L' ') ||
-          (mutable_component.at(mutable_component.size() - 1) == L'.')))
-    mutable_component.resize(mutable_component.size() - 1, L' ');
-
-  // Remove a bunch of forbidden names. windows only seems to mind if
-  // a forbidden name matches our name exactly (e.g. "prn") or if the name is
-  // the forbidden name, followed by a dot, followed by anything
-  // (e.g., "prn.anything.foo.bar")
-
-  // From this point out, we break mutable_component into two strings, and use
-  // them this way: we save anything after and including the first dot (usually
-  // the extension) and only mess with stuff before the first dot.
-  PathString::size_type first_dot = mutable_component.find_first_of(L'.');
-  if (PathString::npos == first_dot)
-    first_dot = mutable_component.size();
-  PathString sub = mutable_component.substr(0, first_dot);
-  PathString postsub = mutable_component.substr(first_dot);
-  CHECK(sub + postsub == mutable_component);
-  for (int i = 0; i < ARRAYSIZE(kWindowsIllegalBaseFilenames); i++) {
-    // ComparePathNames(a, b) == 0 -> same
-    if (syncable::ComparePathNames(kWindowsIllegalBaseFilenames[i], sub) == 0) {
-      sub.append(L"~1");
-      break;
-    }
-  }
-  if ((L"" == sub) && (L"" == postsub)) {
-    sub = L"~1";
-  }
-
-  // Return the new name, only if it differs from the original.
-  if ((sub + postsub) == component)
-    return L"";
-  return (sub + postsub);
-}
+const char kPathSeparator[] = "/";