icu_util.cc revision 868fa2fe829687343ffae624259930155e16dbd8 
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/i18n/icu_util.h"
6
7#include "build/build_config.h"
8
9#if defined(OS_WIN)
10#include <windows.h>
11#endif
12
13#include <string>
14
15#include "base/files/file_path.h"
16#include "base/files/memory_mapped_file.h"
17#include "base/logging.h"
18#include "base/path_service.h"
19#include "base/strings/string_util.h"
20#include "base/strings/sys_string_conversions.h"
21#include "third_party/icu/public/common/unicode/putil.h"
22#include "third_party/icu/public/common/unicode/udata.h"
23
24#if defined(OS_MACOSX)
25#include "base/mac/foundation_util.h"
26#endif
27
28#define ICU_UTIL_DATA_FILE   0
29#define ICU_UTIL_DATA_SHARED 1
30#define ICU_UTIL_DATA_STATIC 2
31
32#ifndef ICU_UTIL_DATA_IMPL
33
34#if defined(OS_WIN)
35#define ICU_UTIL_DATA_IMPL ICU_UTIL_DATA_SHARED
36#elif defined(OS_IOS)
37#define ICU_UTIL_DATA_IMPL ICU_UTIL_DATA_FILE
38#else
39#define ICU_UTIL_DATA_IMPL ICU_UTIL_DATA_STATIC
40#endif
41
42#endif  // ICU_UTIL_DATA_IMPL
43
44#if ICU_UTIL_DATA_IMPL == ICU_UTIL_DATA_FILE
45#define ICU_UTIL_DATA_FILE_NAME "icudt" U_ICU_VERSION_SHORT "l.dat"
46#elif ICU_UTIL_DATA_IMPL == ICU_UTIL_DATA_SHARED
47#define ICU_UTIL_DATA_SYMBOL "icudt" U_ICU_VERSION_SHORT "_dat"
48#if defined(OS_WIN)
49#define ICU_UTIL_DATA_SHARED_MODULE_NAME "icudt.dll"
50#endif
51#endif
52
53using base::FilePath;
54
55namespace icu_util {
56
57bool Initialize() {
58#ifndef NDEBUG
59  // Assert that we are not called more than once.  Even though calling this
60  // function isn't harmful (ICU can handle it), being called twice probably
61  // indicates a programming error.
62  static bool called_once = false;
63  DCHECK(!called_once);
64  called_once = true;
65#endif
66
67#if (ICU_UTIL_DATA_IMPL == ICU_UTIL_DATA_SHARED)
68  // We expect to find the ICU data module alongside the current module.
69  FilePath data_path;
70  PathService::Get(base::DIR_MODULE, &data_path);
71  data_path = data_path.AppendASCII(ICU_UTIL_DATA_SHARED_MODULE_NAME);
72
73  HMODULE module = LoadLibrary(data_path.value().c_str());
74  if (!module) {
75    DLOG(ERROR) << "Failed to load " << ICU_UTIL_DATA_SHARED_MODULE_NAME;
76    return false;
77  }
78
79  FARPROC addr = GetProcAddress(module, ICU_UTIL_DATA_SYMBOL);
80  if (!addr) {
81    DLOG(ERROR) << ICU_UTIL_DATA_SYMBOL << ": not found in "
82               << ICU_UTIL_DATA_SHARED_MODULE_NAME;
83    return false;
84  }
85
86  UErrorCode err = U_ZERO_ERROR;
87  udata_setCommonData(reinterpret_cast<void*>(addr), &err);
88  return err == U_ZERO_ERROR;
89#elif (ICU_UTIL_DATA_IMPL == ICU_UTIL_DATA_STATIC)
90  // Mac/Linux bundle the ICU data in.
91  return true;
92#elif (ICU_UTIL_DATA_IMPL == ICU_UTIL_DATA_FILE)
93#if !defined(OS_MACOSX)
94  // For now, expect the data file to be alongside the executable.
95  // This is sufficient while we work on unit tests, but will eventually
96  // likely live in a data directory.
97  FilePath data_path;
98  bool path_ok = PathService::Get(base::DIR_EXE, &data_path);
99  DCHECK(path_ok);
100  u_setDataDirectory(data_path.value().c_str());
101  // Only look for the packaged data file;
102  // the default behavior is to look for individual files.
103  UErrorCode err = U_ZERO_ERROR;
104  udata_setFileAccess(UDATA_ONLY_PACKAGES, &err);
105  return err == U_ZERO_ERROR;
106#else
107  // If the ICU data directory is set, ICU won't actually load the data until
108  // it is needed.  This can fail if the process is sandboxed at that time.
109  // Instead, Mac maps the file in and hands off the data so the sandbox won't
110  // cause any problems.
111
112  // Chrome doesn't normally shut down ICU, so the mapped data shouldn't ever
113  // be released.
114  CR_DEFINE_STATIC_LOCAL(base::MemoryMappedFile, mapped_file, ());
115  if (!mapped_file.IsValid()) {
116    // Assume it is in the framework bundle's Resources directory.
117    FilePath data_path =
118      base::mac::PathForFrameworkBundleResource(CFSTR(ICU_UTIL_DATA_FILE_NAME));
119    if (data_path.empty()) {
120      DLOG(ERROR) << ICU_UTIL_DATA_FILE_NAME << " not found in bundle";
121      return false;
122    }
123    if (!mapped_file.Initialize(data_path)) {
124      DLOG(ERROR) << "Couldn't mmap " << data_path.value();
125      return false;
126    }
127  }
128  UErrorCode err = U_ZERO_ERROR;
129  udata_setCommonData(const_cast<uint8*>(mapped_file.data()), &err);
130  return err == U_ZERO_ERROR;
131#endif  // OS check
132#endif
133}
134
135}  // namespace icu_util
136