1 // Copyright (C) 2023 Google LLC 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 #include "icing/util/encode-util.h" 16 17 #include <cstdint> 18 #include <string> 19 #include <string_view> 20 21 namespace icing { 22 namespace lib { 23 24 namespace encode_util { 25 EncodeIntToCString(uint64_t value)26std::string EncodeIntToCString(uint64_t value) { 27 std::string encoded_str; 28 // Encode it in base128 and add 1 to make sure that there is no 0-byte. This 29 // increases the size of the encoded_str from 8-bytes to 10-bytes at worst. 30 do { 31 encoded_str.push_back((value & 0x7F) + 1); 32 value >>= 7; 33 } while (value); 34 return encoded_str; 35 } 36 DecodeIntFromCString(std::string_view encoded_str)37uint64_t DecodeIntFromCString(std::string_view encoded_str) { 38 uint64_t value = 0; 39 for (int i = encoded_str.length() - 1; i >= 0; --i) { 40 value <<= 7; 41 char c = encoded_str[i] - 1; 42 value |= (c & 0x7F); 43 } 44 return value; 45 } 46 47 } // namespace encode_util 48 49 } // namespace lib 50 } // namespace icing 51