91 lines
2.8 KiB
C++
91 lines
2.8 KiB
C++
/*
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* Copyright (C) 2017 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 LIBTEXTCLASSIFIER_COMMON_FILE_UTILS_H_
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#define LIBTEXTCLASSIFIER_COMMON_FILE_UTILS_H_
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#include <cstddef>
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#include <memory>
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#include <string>
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#include "common/config.h"
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#if PORTABLE_SAFT_MOBILE
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#include <google/protobuf/io/zero_copy_stream_impl_lite.h>
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#endif
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#include "common/mmap.h"
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#include "util/strings/stringpiece.h"
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namespace libtextclassifier {
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namespace nlp_core {
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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 sp.data() and contains exactly sp.size()
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// bytes. Returns true on success, false otherwise.
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template<class Proto>
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bool ParseProtoFromMemory(StringPiece sp, Proto *proto) {
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if (!sp.data()) {
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// Avoid passing a nullptr to ArrayInputStream below.
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return false;
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}
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#if PORTABLE_SAFT_MOBILE
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::google::protobuf::io::ArrayInputStream stream(sp.data(), sp.size());
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return proto->ParseFromZeroCopyStream(&stream);
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#else
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std::string data(sp.data(), sp.size());
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return proto->ParseFromString(data);
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#endif
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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 nlp_core
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} // namespace libtextclassifier
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#endif // LIBTEXTCLASSIFIER_COMMON_FILE_UTILS_H_
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