1// Copyright 2013 The Flutter 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 "flutter/fml/icu_util.h"
6
7#include <memory>
8#include <mutex>
9
10#include "flutter/fml/build_config.h"
11#include "flutter/fml/logging.h"
12#include "flutter/fml/mapping.h"
13#include "flutter/fml/native_library.h"
14#include "flutter/fml/paths.h"
15#include "third_party/icu/source/common/unicode/udata.h"
16
17namespace fml {
18namespace icu {
19
20class ICUContext {
21 public:
22 explicit ICUContext(const std::string& icu_data_path) : valid_(false) {
23 valid_ = SetupMapping(icu_data_path) && SetupICU();
24 }
25
26 explicit ICUContext(std::unique_ptr<Mapping> mapping)
27 : mapping_(std::move(mapping)) {
28 valid_ = SetupICU();
29 }
30
31 ~ICUContext() = default;
32
33 bool SetupMapping(const std::string& icu_data_path) {
34 // Check if the path exists and it readable directly.
35 auto fd =
36 fml::OpenFile(icu_data_path.c_str(), false, fml::FilePermission::kRead);
37
38 // Check the path relative to the current executable.
39 if (!fd.is_valid()) {
40 auto directory = fml::paths::GetExecutableDirectoryPath();
41
42 if (!directory.first) {
43 return false;
44 }
45
46 std::string path_relative_to_executable =
47 paths::JoinPaths({directory.second, icu_data_path});
48
49 fd = fml::OpenFile(path_relative_to_executable.c_str(), false,
50 fml::FilePermission::kRead);
51 }
52
53 if (!fd.is_valid()) {
54 return false;
55 }
56
57 std::initializer_list<FileMapping::Protection> protection = {
58 fml::FileMapping::Protection::kRead};
59
60 auto file_mapping =
61 std::make_unique<FileMapping>(fd, std::move(protection));
62
63 if (file_mapping->GetSize() != 0) {
64 mapping_ = std::move(file_mapping);
65 return true;
66 }
67
68 return false;
69 }
70
71 bool SetupICU() {
72 if (GetSize() == 0) {
73 return false;
74 }
75
76 UErrorCode err_code = U_ZERO_ERROR;
77 udata_setCommonData(GetMapping(), &err_code);
78 return (err_code == U_ZERO_ERROR);
79 }
80
81 const uint8_t* GetMapping() const {
82 return mapping_ ? mapping_->GetMapping() : nullptr;
83 }
84
85 size_t GetSize() const { return mapping_ ? mapping_->GetSize() : 0; }
86
87 bool IsValid() const { return valid_; }
88
89 private:
90 bool valid_;
91 std::unique_ptr<Mapping> mapping_;
92
93 FML_DISALLOW_COPY_AND_ASSIGN(ICUContext);
94};
95
96void InitializeICUOnce(const std::string& icu_data_path) {
97 static ICUContext* context = new ICUContext(icu_data_path);
98 FML_CHECK(context->IsValid())
99 << "Must be able to initialize the ICU context. Tried: " << icu_data_path;
100}
101
102std::once_flag g_icu_init_flag;
103void InitializeICU(const std::string& icu_data_path) {
104 std::call_once(g_icu_init_flag,
105 [&icu_data_path]() { InitializeICUOnce(icu_data_path); });
106}
107
108void InitializeICUFromMappingOnce(std::unique_ptr<Mapping> mapping) {
109 static ICUContext* context = new ICUContext(std::move(mapping));
110 FML_CHECK(context->IsValid())
111 << "Unable to initialize the ICU context from a mapping.";
112}
113
114void InitializeICUFromMapping(std::unique_ptr<Mapping> mapping) {
115 std::call_once(g_icu_init_flag, [mapping = std::move(mapping)]() mutable {
116 InitializeICUFromMappingOnce(std::move(mapping));
117 });
118}
119
120} // namespace icu
121} // namespace fml
122