Initial commit of sync engine code to browser/sync....

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 "base/port.h"
+#include "chrome/browser/sync/util/path_helpers.h"
+#include "strings/strutil.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;
+}