base/i18n/icu_util.cc

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