mirror of
https://gitlab.futo.org/keyboard/latinime.git
synced 2024-09-28 14:54:30 +01:00
87 lines
3.3 KiB
C++
87 lines
3.3 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 "suggest/policyimpl/dictionary/utils/sparse_table.h"
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namespace latinime {
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const int SparseTable::NOT_EXIST = -1;
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const int SparseTable::INDEX_SIZE = 4;
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bool SparseTable::contains(const int id) const {
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const int readingPos = getPosInIndexTable(id);
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if (id < 0 || mIndexTableBuffer->getTailPosition() <= readingPos) {
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return false;
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}
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const int index = mIndexTableBuffer->readUint(INDEX_SIZE, readingPos);
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return index != NOT_EXIST;
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}
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uint32_t SparseTable::get(const int id) const {
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const int indexTableReadingPos = getPosInIndexTable(id);
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const int index = mIndexTableBuffer->readUint(INDEX_SIZE, indexTableReadingPos);
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const int contentTableReadingPos = getPosInContentTable(id, index);
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return mContentTableBuffer->readUint(mDataSize, contentTableReadingPos);
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}
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bool SparseTable::set(const int id, const uint32_t value) {
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const int posInIndexTable = getPosInIndexTable(id);
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// Extends the index table if needed.
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if (mIndexTableBuffer->getTailPosition() < posInIndexTable) {
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int tailPos = mIndexTableBuffer->getTailPosition();
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while(tailPos < posInIndexTable) {
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if (!mIndexTableBuffer->writeUintAndAdvancePosition(NOT_EXIST, INDEX_SIZE, &tailPos)) {
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return false;
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}
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}
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}
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if (contains(id)) {
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// The entry is already in the content table.
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const int index = mIndexTableBuffer->readUint(INDEX_SIZE, posInIndexTable);
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return mContentTableBuffer->writeUint(value, mDataSize, getPosInContentTable(id, index));
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}
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// The entry is not in the content table.
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// Create new entry in the content table.
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const int index = getIndexFromContentTablePos(mContentTableBuffer->getTailPosition());
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if (!mIndexTableBuffer->writeUint(index, INDEX_SIZE, posInIndexTable)) {
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return false;
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}
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// Write a new block that containing the entry to be set.
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int writingPos = getPosInContentTable(0 /* id */, index);
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for (int i = 0; i < mBlockSize; ++i) {
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if (!mContentTableBuffer->writeUintAndAdvancePosition(NOT_A_DICT_POS, mDataSize,
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&writingPos)) {
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return false;
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}
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}
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return mContentTableBuffer->writeUint(value, mDataSize, getPosInContentTable(id, index));
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}
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int SparseTable::getIndexFromContentTablePos(const int contentTablePos) const {
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return contentTablePos / mDataSize / mBlockSize;
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}
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int SparseTable::getPosInIndexTable(const int id) const {
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return (id / mBlockSize) * INDEX_SIZE;
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}
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int SparseTable::getPosInContentTable(const int id, const int index) const {
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const int offset = id % mBlockSize;
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return (index * mDataSize + offset) * mBlockSize;
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}
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} // namespace latinime
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