1 /* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 // Common utils for memory images. 18 19 #ifndef LIBTEXTCLASSIFIER_COMMON_MEMORY_IMAGE_MEMORY_IMAGE_COMMON_H_ 20 #define LIBTEXTCLASSIFIER_COMMON_MEMORY_IMAGE_MEMORY_IMAGE_COMMON_H_ 21 22 #include <stddef.h> 23 24 #include <string> 25 26 #include "util/strings/stringpiece.h" 27 28 namespace libtextclassifier { 29 namespace nlp_core { 30 31 class MemoryImageConstants { 32 public: 33 static const char kSignature[]; 34 static const int kCurrentVersion; 35 static const int kDefaultAlignment; 36 }; 37 38 // Read-only "view" of a data blob. Does not own the underlying data; instead, 39 // just a small object that points to an area of a memory image. 40 // 41 // TODO(salcianu): replace this class with StringPiece. 42 class DataBlobView { 43 public: 44 DataBlobView() : DataBlobView(nullptr, 0) {} 45 46 DataBlobView(const void *start, size_t size) 47 : start_(start), size_(size) {} 48 49 // Returns start address of a data blob from a memory image. 50 const void *data() const { return start_; } 51 52 // Returns number of bytes from the data blob starting at start(). 53 size_t size() const { return size_; } 54 55 StringPiece to_stringpiece() const { 56 return StringPiece(reinterpret_cast<const char *>(data()), 57 size()); 58 } 59 60 // Returns a std::string containing a copy of the data blob bytes. 61 std::string ToString() const { 62 return to_stringpiece().ToString(); 63 } 64 65 private: 66 const void *start_; // Not owned. 67 size_t size_; 68 }; 69 70 } // namespace nlp_core 71 } // namespace libtextclassifier 72 73 #endif // LIBTEXTCLASSIFIER_COMMON_MEMORY_IMAGE_MEMORY_IMAGE_COMMON_H_ 74
