73 lines
2.8 KiB
C++
73 lines
2.8 KiB
C++
/*
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* Copyright (C) 2013, The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "dictionary/structure/pt_common/dynamic_pt_reading_utils.h"
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#include "defines.h"
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#include "dictionary/utils/byte_array_utils.h"
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namespace latinime {
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const DynamicPtReadingUtils::NodeFlags DynamicPtReadingUtils::MASK_MOVED = 0xC0;
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const DynamicPtReadingUtils::NodeFlags DynamicPtReadingUtils::FLAG_IS_NOT_MOVED = 0xC0;
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const DynamicPtReadingUtils::NodeFlags DynamicPtReadingUtils::FLAG_IS_MOVED = 0x40;
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const DynamicPtReadingUtils::NodeFlags DynamicPtReadingUtils::FLAG_IS_DELETED = 0x80;
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const DynamicPtReadingUtils::NodeFlags DynamicPtReadingUtils::FLAG_WILL_BECOME_NON_TERMINAL = 0x00;
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// TODO: Make DICT_OFFSET_ZERO_OFFSET = 0.
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// Currently, DICT_OFFSET_INVALID is 0 in Java side but offset can be 0 during GC. So, the maximum
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// value of offsets, which is 0x7FFFFF is used to represent 0 offset.
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const int DynamicPtReadingUtils::DICT_OFFSET_INVALID = 0;
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const int DynamicPtReadingUtils::DICT_OFFSET_ZERO_OFFSET = 0x7FFFFF;
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/* static */ int DynamicPtReadingUtils::getForwardLinkPosition(const uint8_t *const buffer,
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const int pos) {
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int linkAddressPos = pos;
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return ByteArrayUtils::readSint24AndAdvancePosition(buffer, &linkAddressPos);
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}
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/* static */ int DynamicPtReadingUtils::getParentPtNodePosOffsetAndAdvancePosition(
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const uint8_t *const buffer, int *const pos) {
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return ByteArrayUtils::readSint24AndAdvancePosition(buffer, pos);
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}
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/* static */ int DynamicPtReadingUtils::getParentPtNodePos(const int parentOffset,
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const int ptNodePos) {
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if (parentOffset == DICT_OFFSET_INVALID) {
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return NOT_A_DICT_POS;
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} else if (parentOffset == DICT_OFFSET_ZERO_OFFSET) {
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return ptNodePos;
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} else {
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return parentOffset + ptNodePos;
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}
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}
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/* static */ int DynamicPtReadingUtils::readChildrenPositionAndAdvancePosition(
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const uint8_t *const buffer, int *const pos) {
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const int base = *pos;
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const int offset = ByteArrayUtils::readSint24AndAdvancePosition(buffer, pos);
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if (offset == DICT_OFFSET_INVALID) {
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// The PtNode does not have children.
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return NOT_A_DICT_POS;
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} else if (offset == DICT_OFFSET_ZERO_OFFSET) {
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return base;
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} else {
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return base + offset;
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}
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}
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} // namespace latinime
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