1 /* 2 * Copyright (C) 2013, 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 #include "dictionary/structure/pt_common/dynamic_pt_reading_utils.h" 18 19 #include "defines.h" 20 #include "dictionary/utils/byte_array_utils.h" 21 22 namespace latinime { 23 24 const DynamicPtReadingUtils::NodeFlags DynamicPtReadingUtils::MASK_MOVED = 0xC0; 25 const DynamicPtReadingUtils::NodeFlags DynamicPtReadingUtils::FLAG_IS_NOT_MOVED = 0xC0; 26 const DynamicPtReadingUtils::NodeFlags DynamicPtReadingUtils::FLAG_IS_MOVED = 0x40; 27 const DynamicPtReadingUtils::NodeFlags DynamicPtReadingUtils::FLAG_IS_DELETED = 0x80; 28 const DynamicPtReadingUtils::NodeFlags DynamicPtReadingUtils::FLAG_WILL_BECOME_NON_TERMINAL = 0x00; 29 30 // TODO: Make DICT_OFFSET_ZERO_OFFSET = 0. 31 // Currently, DICT_OFFSET_INVALID is 0 in Java side but offset can be 0 during GC. So, the maximum 32 // value of offsets, which is 0x7FFFFF is used to represent 0 offset. 33 const int DynamicPtReadingUtils::DICT_OFFSET_INVALID = 0; 34 const int DynamicPtReadingUtils::DICT_OFFSET_ZERO_OFFSET = 0x7FFFFF; 35 36 /* static */ int DynamicPtReadingUtils::getForwardLinkPosition(const uint8_t *const buffer, 37 const int pos) { 38 int linkAddressPos = pos; 39 return ByteArrayUtils::readSint24AndAdvancePosition(buffer, &linkAddressPos); 40 } 41 42 /* static */ int DynamicPtReadingUtils::getParentPtNodePosOffsetAndAdvancePosition( 43 const uint8_t *const buffer, int *const pos) { 44 return ByteArrayUtils::readSint24AndAdvancePosition(buffer, pos); 45 } 46 47 /* static */ int DynamicPtReadingUtils::getParentPtNodePos(const int parentOffset, 48 const int ptNodePos) { 49 if (parentOffset == DICT_OFFSET_INVALID) { 50 return NOT_A_DICT_POS; 51 } else if (parentOffset == DICT_OFFSET_ZERO_OFFSET) { 52 return ptNodePos; 53 } else { 54 return parentOffset + ptNodePos; 55 } 56 } 57 58 /* static */ int DynamicPtReadingUtils::readChildrenPositionAndAdvancePosition( 59 const uint8_t *const buffer, int *const pos) { 60 const int base = *pos; 61 const int offset = ByteArrayUtils::readSint24AndAdvancePosition(buffer, pos); 62 if (offset == DICT_OFFSET_INVALID) { 63 // The PtNode does not have children. 64 return NOT_A_DICT_POS; 65 } else if (offset == DICT_OFFSET_ZERO_OFFSET) { 66 return base; 67 } else { 68 return base + offset; 69 } 70 } 71 72 } // namespace latinime 73
