102 lines
4.1 KiB
C++
102 lines
4.1 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/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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if (contentTableReadingPos < 0
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|| contentTableReadingPos >= mContentTableBuffer->getTailPosition()) {
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AKLOGE("contentTableReadingPos(%d) is invalid. id: %d, index: %d",
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contentTableReadingPos, id, index);
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return NOT_A_DICT_POS;
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}
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const int contentValue = mContentTableBuffer->readUint(mDataSize, contentTableReadingPos);
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return contentValue == NOT_EXIST ? NOT_A_DICT_POS : contentValue;
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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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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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AKLOGE("cannot extend index table. tailPos: %d to: %d", tailPos, posInIndexTable);
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return false;
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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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if (!mContentTableBuffer->writeUint(value, mDataSize, getPosInContentTable(id, index))) {
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AKLOGE("cannot update value %d. pos: %d, tailPos: %d, mDataSize: %d", value,
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getPosInContentTable(id, index), mContentTableBuffer->getTailPosition(),
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mDataSize);
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return false;
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}
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return true;
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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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AKLOGE("cannot write index %d. pos %d", index, 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_EXIST, mDataSize,
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&writingPos)) {
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AKLOGE("cannot write content table to extend. writingPos: %d, tailPos: %d, "
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"mDataSize: %d", writingPos, mContentTableBuffer->getTailPosition(), mDataSize);
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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 * mBlockSize + offset) * mDataSize;
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}
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} // namespace latinime
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