1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 // 5 // Class for parsing lists of integers into ranges. 6 // 7 // The anti-phishing and anti-malware protocol sends ASCII strings of numbers 8 // and ranges of numbers corresponding to chunks of whitelists and blacklists. 9 // Clients of this protocol need to be able to convert back and forth between 10 // this representation, and individual integer chunk numbers. The ChunkRange 11 // class is a simple and compact mechanism for storing a continuous list of 12 // chunk numbers. 13 14 #ifndef CHROME_BROWSER_SAFE_BROWSING_CHUNK_RANGE_H_ 15 #define CHROME_BROWSER_SAFE_BROWSING_CHUNK_RANGE_H_ 16 17 #include <string> 18 #include <vector> 19 20 // ChunkRange ------------------------------------------------------------------ 21 // Each ChunkRange represents a continuous range of chunk numbers [start, stop]. 22 23 class ChunkRange { 24 public: 25 explicit ChunkRange(int start); 26 ChunkRange(int start, int stop); 27 ChunkRange(const ChunkRange& rhs); 28 29 inline int start() const { return start_; } 30 inline int stop() const { return stop_; } 31 32 bool operator==(const ChunkRange& rhs) const { 33 return start_ == rhs.start() && stop_ == rhs.stop(); 34 } 35 36 private: 37 int start_; 38 int stop_; 39 }; 40 41 42 // Helper functions ------------------------------------------------------------ 43 44 // Convert a set of ranges into individual chunk numbers. 45 void RangesToChunks(const std::vector<ChunkRange>& ranges, 46 std::vector<int>* chunks); 47 48 // Returns 'true' if the string was successfully converted to ChunkRanges, 49 // 'false' if the input was malformed. 50 // The string must be in the form: "1-100,398,415,1138-2001,2019". 51 bool StringToRanges(const std::string& input, 52 std::vector<ChunkRange>* ranges); 53 54 // Convenience for going from a list of chunks to a string in protocol 55 // format. 56 void ChunksToRangeString(const std::vector<int>& chunks, std::string* result); 57 58 // Tests if a chunk number is contained a sorted vector of ChunkRanges. 59 bool IsChunkInRange(int chunk_number, const std::vector<ChunkRange>& ranges); 60 61 #endif // CHROME_BROWSER_SAFE_BROWSING_CHUNK_RANGE_H_ 62
