1 /* 2 * Copyright 2006 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 #ifndef _OTAUTIL_SYSUTIL 18 #define _OTAUTIL_SYSUTIL 19 20 #include <sys/types.h> 21 22 #include <string> 23 #include <vector> 24 25 /* 26 * Use this to keep track of mapped segments. 27 */ 28 class MemMapping { 29 public: 30 ~MemMapping(); 31 // Map a file into a private, read-only memory segment. If 'filename' begins with an '@' 32 // character, it is a map of blocks to be mapped, otherwise it is treated as an ordinary file. 33 bool MapFile(const std::string& filename); 34 size_t ranges() const { 35 return ranges_.size(); 36 }; 37 38 unsigned char* addr; // start of data 39 size_t length; // length of data 40 41 private: 42 struct MappedRange { 43 void* addr; 44 size_t length; 45 }; 46 47 bool MapBlockFile(const std::string& filename); 48 bool MapFD(int fd); 49 50 std::vector<MappedRange> ranges_; 51 }; 52 53 #endif // _OTAUTIL_SYSUTIL 54
