icu_util.cc revision 3551c9c881056c480085172ff9840cab31610854 
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/source/common/unicode/putil.h"
22#include "third_party/icu/source/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
53namespace base {
54namespace i18n {
55
56bool InitializeICU() {
57#ifndef NDEBUG
58  // Assert that we are not called more than once.  Even though calling this
59  // function isn't harmful (ICU can handle it), being called twice probably
60  // indicates a programming error.
61  static bool called_once = false;
62  DCHECK(!called_once);
63  called_once = true;
64#endif
65
66#if (ICU_UTIL_DATA_IMPL == ICU_UTIL_DATA_SHARED)
67  // We expect to find the ICU data module alongside the current module.
68  FilePath data_path;
69  PathService::Get(base::DIR_MODULE, &data_path);
70  data_path = data_path.AppendASCII(ICU_UTIL_DATA_SHARED_MODULE_NAME);
71
72  HMODULE module = LoadLibrary(data_path.value().c_str());
73  if (!module) {
74    DLOG(ERROR) << "Failed to load " << ICU_UTIL_DATA_SHARED_MODULE_NAME;
75    return false;
76  }
77
78  FARPROC addr = GetProcAddress(module, ICU_UTIL_DATA_SYMBOL);
79  if (!addr) {
80    DLOG(ERROR) << ICU_UTIL_DATA_SYMBOL << ": not found in "
81               << ICU_UTIL_DATA_SHARED_MODULE_NAME;
82    return false;
83  }
84
85  UErrorCode err = U_ZERO_ERROR;
86  udata_setCommonData(reinterpret_cast<void*>(addr), &err);
87  return err == U_ZERO_ERROR;
88#elif (ICU_UTIL_DATA_IMPL == ICU_UTIL_DATA_STATIC)
89  // Mac/Linux bundle the ICU data in.
90  return true;
91#elif (ICU_UTIL_DATA_IMPL == ICU_UTIL_DATA_FILE)
92#if !defined(OS_MACOSX)
93  // For now, expect the data file to be alongside the executable.
94  // This is sufficient while we work on unit tests, but will eventually
95  // likely live in a data directory.
96  FilePath data_path;
97  bool path_ok = PathService::Get(base::DIR_EXE, &data_path);
98  DCHECK(path_ok);
99  u_setDataDirectory(data_path.value().c_str());
100  // Only look for the packaged data file;
101  // the default behavior is to look for individual files.
102  UErrorCode err = U_ZERO_ERROR;
103  udata_setFileAccess(UDATA_ONLY_PACKAGES, &err);
104  return err == U_ZERO_ERROR;
105#else
106  // If the ICU data directory is set, ICU won't actually load the data until
107  // it is needed.  This can fail if the process is sandboxed at that time.
108  // Instead, Mac maps the file in and hands off the data so the sandbox won't
109  // cause any problems.
110
111  // Chrome doesn't normally shut down ICU, so the mapped data shouldn't ever
112  // be released.
113  CR_DEFINE_STATIC_LOCAL(base::MemoryMappedFile, mapped_file, ());
114  if (!mapped_file.IsValid()) {
115    // Assume it is in the framework bundle's Resources directory.
116    FilePath data_path =
117      base::mac::PathForFrameworkBundleResource(CFSTR(ICU_UTIL_DATA_FILE_NAME));
118    if (data_path.empty()) {
119      DLOG(ERROR) << ICU_UTIL_DATA_FILE_NAME << " not found in bundle";
120      return false;
121    }
122    if (!mapped_file.Initialize(data_path)) {
123      DLOG(ERROR) << "Couldn't mmap " << data_path.value();
124      return false;
125    }
126  }
127  UErrorCode err = U_ZERO_ERROR;
128  udata_setCommonData(const_cast<uint8*>(mapped_file.data()), &err);
129  return err == U_ZERO_ERROR;
130#endif  // OS check
131#endif
132}
133
134}  // namespace i18n
135}  // namespace base
136