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85 lines
2.8 KiB
85 lines
2.8 KiB
/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef NLP_SAFT_COMPONENTS_COMMON_MOBILE_FILE_FILE_UTILS_H_
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#define NLP_SAFT_COMPONENTS_COMMON_MOBILE_FILE_FILE_UTILS_H_
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#include <stddef.h>
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#include <string>
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#include "lang_id/common/file/mmap.h"
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#include "lang_id/common/lite_strings/stringpiece.h"
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namespace libtextclassifier3 {
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namespace mobile {
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namespace file_utils {
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// Reads the entire content of a file into a string. Returns true on success,
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// false on error.
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bool GetFileContent(const std::string &filename, std::string *content);
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// Parses a proto from its serialized representation in memory. That
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// representation starts at address |data| and should contain exactly
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// |num_bytes| bytes. Returns true on success, false otherwise.
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template <class Proto>
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bool ParseProtoFromMemory(const char *data, size_t num_bytes, Proto *proto) {
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if (data == nullptr) {
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// Avoid passing a nullptr to ParseFromArray below.
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return false;
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}
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return proto->ParseFromArray(data, num_bytes);
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}
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// Convenience StringPiece-based version of ParseProtoFromMemory.
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template <class Proto>
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inline bool ParseProtoFromMemory(StringPiece sp, Proto *proto) {
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return ParseProtoFromMemory(sp.data(), sp.size(), proto);
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}
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// Parses a proto from a file. Returns true on success, false otherwise.
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//
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// Note: the entire content of the file should be the binary (not
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// human-readable) serialization of a protocol buffer.
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//
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// Note: when we compile for Android, the proto parsing methods need to know the
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// type of the message they are parsing. We use template polymorphism for that.
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template <class Proto>
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bool ReadProtoFromFile(const std::string &filename, Proto *proto) {
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ScopedMmap scoped_mmap(filename);
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const MmapHandle &handle = scoped_mmap.handle();
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if (!handle.ok()) {
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return false;
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}
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return ParseProtoFromMemory(handle.to_stringpiece(), proto);
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}
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// Returns true if filename is the name of an existing file, and false
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// otherwise.
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bool FileExists(const std::string &filename);
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// Returns true if dirpath is the path to an existing directory, and false
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// otherwise.
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bool DirectoryExists(const std::string &dirpath);
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} // namespace file_utils
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} // namespace mobile
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} // namespace nlp_saft
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#endif // NLP_SAFT_COMPONENTS_COMMON_MOBILE_FILE_FILE_UTILS_H_
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