Build sync engine as part of the browser build

chrome/browser/sync/util/path_helpers-posix.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 <pwd.h>
-#include <string.h>
-
-#include "chrome/browser/sync/util/path_helpers.h"
-
-#if ((!defined(OS_LINUX)) && (!defined(OS_MACOSX)))
-#error Compile this file on Mac OS X or Linux only.
-#endif
-
-PathString ExpandTilde(const PathString& path) {
-  if (path.empty())
-    return path;
-  if ('~' != path[0])
-    return path;
-  PathString ret;
-  // TODO(sync): Consider using getpwuid_r.
-  ret.insert(0, getpwuid(getuid())->pw_dir);
-  ret.append(++path.begin(), path.end());
-  return ret;
-}
-
-namespace {
-// TODO(sync): We really should use char[].
-string cache_dir_;
-}
-
-void set_cache_dir(string cache_dir) {
-  CHECK(cache_dir_.empty());
-  cache_dir_ = cache_dir;
-}
-
-string get_cache_dir() {
-  CHECK(!cache_dir_.empty());
-  return cache_dir_;
-}
-
-// On Posix, PathStrings are UTF-8, not UTF-16 as they are on Windows. Thus,
-// this function is different from the Windows version.
-PathString TruncatePathString(const PathString& original, int length) {
-  if (original.size() <= length)
-    return original;
-  if (length <= 0)
-    return original;
-  PathString ret(original.begin(), original.begin() + length);
-  COMPILE_ASSERT(sizeof(PathChar) == sizeof(uint8), PathStringNotUTF8);
-  PathString::reverse_iterator last_char = ret.rbegin();
-
-  // Values taken from
-  // http://en.wikipedia.org/w/index.php?title=UTF-8&oldid=252875566
-  if (0 == (*last_char & 0x80))
-    return ret;
-
-  for (; last_char != ret.rend(); ++last_char) {
-    if (0 == (*last_char & 0x80)) {
-      // Got malformed UTF-8; bail.
-      return ret;
-    }
-    if (0 == (*last_char & 0x40)) {
-      // Got another trailing byte.
-      continue;
-    }
-    break;
-  }
-
-  if (ret.rend() == last_char) {
-    // We hit the beginning of the string. bail.
-    return ret;
-  }
-
-  int last_codepoint_len = last_char - ret.rbegin() + 1;
-
-  if (((0xC0 == (*last_char & 0xE0)) && (2 == last_codepoint_len)) ||
-      ((0xE0 == (*last_char & 0xF0)) && (3 == last_codepoint_len)) ||
-      ((0xF0 == (*last_char & 0xF8)) && (4 == last_codepoint_len))) {
-    // Valid utf-8.
-    return ret;
-  }
-
-  // Invalid utf-8. chop off last "codepoint" and return.
-  ret.resize(ret.size() - last_codepoint_len);
-  return ret;
-}
-
-// Convert /s to :s.
-PathString MakePathComponentOSLegal(const PathString& component) {
-  if (PathString::npos == component.find("/"))
-    return PSTR("");
-  PathString new_name;
-  new_name.reserve(component.size());
-  StringReplace(component, "/", ":", true, &new_name);
-  return new_name;
-}