icu_util.cc revision ddb351dbec246cf1fab5ec20d2d5520909041de1 
1// Copyright (c) 2009 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/file_path.h"
16#include "base/file_util.h"
17#include "base/logging.h"
18#include "base/path_service.h"
19#include "base/string_util.h"
20#include "base/sys_string_conversions.h"
21#include "unicode/putil.h"
22#include "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#else
37#define ICU_UTIL_DATA_IMPL ICU_UTIL_DATA_STATIC
38#endif
39
40#endif  // ICU_UTIL_DATA_IMPL
41
42#if ICU_UTIL_DATA_IMPL == ICU_UTIL_DATA_FILE
43#define ICU_UTIL_DATA_FILE_NAME "icudt" U_ICU_VERSION_SHORT "l.dat"
44#elif ICU_UTIL_DATA_IMPL == ICU_UTIL_DATA_SHARED
45#define ICU_UTIL_DATA_SYMBOL "icudt" U_ICU_VERSION_SHORT "_dat"
46#if defined(OS_WIN)
47#define ICU_UTIL_DATA_SHARED_MODULE_NAME "icudt.dll"
48#endif
49#endif
50
51namespace icu_util {
52
53bool Initialize() {
54#ifndef NDEBUG
55  // Assert that we are not called more than once.  Even though calling this
56  // function isn't harmful (ICU can handle it), being called twice probably
57  // indicates a programming error.
58  static bool called_once = false;
59  DCHECK(!called_once);
60  called_once = true;
61#endif
62
63#if (ICU_UTIL_DATA_IMPL == ICU_UTIL_DATA_SHARED)
64  // We expect to find the ICU data module alongside the current module.
65  FilePath data_path;
66  PathService::Get(base::DIR_MODULE, &data_path);
67  data_path = data_path.AppendASCII(ICU_UTIL_DATA_SHARED_MODULE_NAME);
68
69  HMODULE module = LoadLibrary(data_path.value().c_str());
70  if (!module) {
71    LOG(ERROR) << "Failed to load " << ICU_UTIL_DATA_SHARED_MODULE_NAME;
72    return false;
73  }
74
75  FARPROC addr = GetProcAddress(module, ICU_UTIL_DATA_SYMBOL);
76  if (!addr) {
77    LOG(ERROR) << ICU_UTIL_DATA_SYMBOL << ": not found in "
78               << ICU_UTIL_DATA_SHARED_MODULE_NAME;
79    return false;
80  }
81
82  UErrorCode err = U_ZERO_ERROR;
83  udata_setCommonData(reinterpret_cast<void*>(addr), &err);
84  return err == U_ZERO_ERROR;
85#elif (ICU_UTIL_DATA_IMPL == ICU_UTIL_DATA_STATIC)
86  // Mac/Linux bundle the ICU data in.
87  return true;
88#elif (ICU_UTIL_DATA_IMPL == ICU_UTIL_DATA_FILE)
89#if !defined(OS_MACOSX)
90  // For now, expect the data file to be alongside the executable.
91  // This is sufficient while we work on unit tests, but will eventually
92  // likely live in a data directory.
93  FilePath data_path;
94  bool path_ok = PathService::Get(base::DIR_EXE, &data_path);
95  DCHECK(path_ok);
96  u_setDataDirectory(data_path.value().c_str());
97  // Only look for the packaged data file;
98  // the default behavior is to look for individual files.
99  UErrorCode err = U_ZERO_ERROR;
100  udata_setFileAccess(UDATA_ONLY_PACKAGES, &err);
101  return err == U_ZERO_ERROR;
102#else
103  // If the ICU data directory is set, ICU won't actually load the data until
104  // it is needed.  This can fail if the process is sandboxed at that time.
105  // Instead, Mac maps the file in and hands off the data so the sandbox won't
106  // cause any problems.
107
108  // Chrome doesn't normally shut down ICU, so the mapped data shouldn't ever
109  // be released.
110  static file_util::MemoryMappedFile mapped_file;
111  if (!mapped_file.IsValid()) {
112    // Assume it is in the MainBundle's Resources directory.
113    FilePath data_path =
114      base::mac::PathForMainAppBundleResource(CFSTR(ICU_UTIL_DATA_FILE_NAME));
115    if (data_path.empty()) {
116      LOG(ERROR) << ICU_UTIL_DATA_FILE_NAME << " not found in bundle";
117      return false;
118    }
119    if (!mapped_file.Initialize(data_path)) {
120      LOG(ERROR) << "Couldn't mmap " << data_path.value();
121      return false;
122    }
123  }
124  UErrorCode err = U_ZERO_ERROR;
125  udata_setCommonData(const_cast<uint8*>(mapped_file.data()), &err);
126  return err == U_ZERO_ERROR;
127#endif  // OS check
128#endif
129}
130
131}  // namespace icu_util
132