| /* |
| * Copyright (C) 2013, The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef LATINIME_DYNAMIC_PATRICIA_TRIE_READING_UTILS_H |
| #define LATINIME_DYNAMIC_PATRICIA_TRIE_READING_UTILS_H |
| |
| #include <stdint.h> |
| |
| #include "defines.h" |
| |
| namespace latinime { |
| |
| class DynamicPatriciaTrieReadingUtils { |
| public: |
| typedef uint8_t NodeFlags; |
| |
| static const int DICT_OFFSET_INVALID; |
| static const int DICT_OFFSET_ZERO_OFFSET; |
| |
| static int getForwardLinkPosition(const uint8_t *const buffer, const int pos); |
| |
| static AK_FORCE_INLINE bool isValidForwardLinkPosition(const int forwardLinkAddress) { |
| return forwardLinkAddress != 0; |
| } |
| |
| static int getParentPtNodePosOffsetAndAdvancePosition(const uint8_t *const buffer, |
| int *const pos); |
| |
| static int getParentPtNodePos(const int parentOffset, const int ptNodePos); |
| |
| static int readChildrenPositionAndAdvancePosition(const uint8_t *const buffer, int *const pos); |
| |
| /** |
| * Node Flags |
| */ |
| static AK_FORCE_INLINE bool isMoved(const NodeFlags flags) { |
| return FLAG_IS_MOVED == (MASK_MOVED & flags); |
| } |
| |
| static AK_FORCE_INLINE bool isDeleted(const NodeFlags flags) { |
| return FLAG_IS_DELETED == (MASK_MOVED & flags); |
| } |
| |
| static AK_FORCE_INLINE NodeFlags updateAndGetFlags(const NodeFlags originalFlags, |
| const bool isMoved, const bool isDeleted) { |
| NodeFlags flags = originalFlags; |
| flags = isMoved ? ((flags & (~MASK_MOVED)) | FLAG_IS_MOVED) : flags; |
| flags = isDeleted ? ((flags & (~MASK_MOVED)) | FLAG_IS_DELETED) : flags; |
| flags = (!isMoved && !isDeleted) ? ((flags & (~MASK_MOVED)) | FLAG_IS_NOT_MOVED) : flags; |
| return flags; |
| } |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(DynamicPatriciaTrieReadingUtils); |
| |
| static const NodeFlags MASK_MOVED; |
| static const NodeFlags FLAG_IS_NOT_MOVED; |
| static const NodeFlags FLAG_IS_MOVED; |
| static const NodeFlags FLAG_IS_DELETED; |
| }; |
| } // namespace latinime |
| #endif /* LATINIME_DYNAMIC_PATRICIA_TRIE_READING_UTILS_H */ |