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icu_util.cc
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icu_util.cc
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// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "flutter/fml/icu_util.h"
#include <memory>
#include <mutex>
#include "flutter/fml/build_config.h"
#include "flutter/fml/logging.h"
#include "flutter/fml/mapping.h"
#include "flutter/fml/native_library.h"
#include "flutter/fml/paths.h"
#include "third_party/icu/source/common/unicode/udata.h"
namespace fml {
namespace icu {
class ICUContext {
public:
ICUContext(const std::string& icu_data_path) : valid_(false) {
valid_ = SetupMapping(icu_data_path) && SetupICU();
}
ICUContext(std::unique_ptr<Mapping> mapping) : mapping_(std::move(mapping)) {
valid_ = SetupICU();
}
~ICUContext() = default;
bool SetupMapping(const std::string& icu_data_path) {
// Check if the path exists and it readable directly.
auto fd =
fml::OpenFile(icu_data_path.c_str(), false, fml::FilePermission::kRead);
// Check the path relative to the current executable.
if (!fd.is_valid()) {
auto directory = fml::paths::GetExecutableDirectoryPath();
if (!directory.first) {
return false;
}
std::string path_relative_to_executable =
paths::JoinPaths({directory.second, icu_data_path});
fd = fml::OpenFile(path_relative_to_executable.c_str(), false,
fml::FilePermission::kRead);
}
if (!fd.is_valid()) {
return false;
}
std::initializer_list<FileMapping::Protection> protection = {
fml::FileMapping::Protection::kRead};
auto file_mapping =
std::make_unique<FileMapping>(fd, std::move(protection));
if (file_mapping->GetSize() != 0) {
mapping_ = std::move(file_mapping);
return true;
}
return false;
}
bool SetupICU() {
if (GetSize() == 0) {
return false;
}
UErrorCode err_code = U_ZERO_ERROR;
udata_setCommonData(GetMapping(), &err_code);
return (err_code == U_ZERO_ERROR);
}
const uint8_t* GetMapping() const {
return mapping_ ? mapping_->GetMapping() : nullptr;
}
size_t GetSize() const { return mapping_ ? mapping_->GetSize() : 0; }
bool IsValid() const { return valid_; }
private:
bool valid_;
std::unique_ptr<Mapping> mapping_;
FML_DISALLOW_COPY_AND_ASSIGN(ICUContext);
};
void InitializeICUOnce(const std::string& icu_data_path) {
static ICUContext* context = new ICUContext(icu_data_path);
FML_CHECK(context->IsValid())
<< "Must be able to initialize the ICU context. Tried: " << icu_data_path;
}
std::once_flag g_icu_init_flag;
void InitializeICU(const std::string& icu_data_path) {
std::call_once(g_icu_init_flag,
[&icu_data_path]() { InitializeICUOnce(icu_data_path); });
}
void InitializeICUFromMappingOnce(std::unique_ptr<Mapping> mapping) {
static ICUContext* context = new ICUContext(std::move(mapping));
FML_CHECK(context->IsValid())
<< "Unable to initialize the ICU context from a mapping.";
}
void InitializeICUFromMapping(std::unique_ptr<Mapping> mapping) {
std::call_once(g_icu_init_flag, [mapping = std::move(mapping)]() mutable {
InitializeICUFromMappingOnce(std::move(mapping));
});
}
} // namespace icu
} // namespace fml