1 // Copyright (C) 2019 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/file/posting_list/posting-list-utils.h" 16 17 #include "icing/legacy/index/icing-bit-util.h" 18 #include "icing/util/logging.h" 19 20 namespace icing { 21 namespace lib { 22 23 namespace posting_list_utils { 24 IsValidPostingListSize(uint32_t size_in_bytes,uint32_t data_type_bytes,uint32_t min_posting_list_size)25bool IsValidPostingListSize(uint32_t size_in_bytes, uint32_t data_type_bytes, 26 uint32_t min_posting_list_size) { 27 // size must be data_type_bytes aligned. Otherwise, we can have serious 28 // wasted space in the worst case. 29 if (size_in_bytes % data_type_bytes != 0) { 30 ICING_LOG(ERROR) << "Size " << size_in_bytes << " data " << data_type_bytes; 31 return false; 32 } 33 34 // Must be able to store the min information. 35 if (size_in_bytes < min_posting_list_size) { 36 ICING_LOG(ERROR) << "Size " << size_in_bytes << " is less than min size " 37 << min_posting_list_size; 38 return false; 39 } 40 41 // We re-use the first two data as pointers into the posting list 42 // so the posting list size must fit in data_type_bytes. 43 if (BitsToStore(size_in_bytes) > data_type_bytes * 8) { 44 ICING_LOG(ERROR) 45 << "Posting list size must be small enough to store the offset in " 46 << data_type_bytes << " bytes."; 47 return false; 48 } 49 50 return true; 51 } 52 53 } // namespace posting_list_utils 54 55 } // namespace lib 56 } // namespace icing 57