Home | History | Annotate | Download | only in v4 
      1 /*
      2  * Copyright (C) 2014, 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/v4/ver4_pt_node_array_reader.h"
     18 
     19 #include "dictionary/structure/pt_common/dynamic_pt_reading_utils.h"
     20 #include "dictionary/structure/pt_common/patricia_trie_reading_utils.h"
     21 #include "dictionary/utils/buffer_with_extendable_buffer.h"
     22 
     23 namespace latinime {
     24 
     25 bool Ver4PtNodeArrayReader::readPtNodeArrayInfoAndReturnIfValid(const int ptNodeArrayPos,
     26         int *const outPtNodeCount, int *const outFirstPtNodePos) const {
     27     if (ptNodeArrayPos < 0 || ptNodeArrayPos >= mBuffer->getTailPosition()) {
     28         // Reading invalid position because of a bug or a broken dictionary.
     29         AKLOGE("Reading PtNode array info from invalid dictionary position: %d, dict size: %d",
     30                 ptNodeArrayPos, mBuffer->getTailPosition());
     31         ASSERT(false);
     32         return false;
     33     }
     34     const bool usesAdditionalBuffer = mBuffer->isInAdditionalBuffer(ptNodeArrayPos);
     35     const uint8_t *const dictBuf = mBuffer->getBuffer(usesAdditionalBuffer);
     36     int readingPos = ptNodeArrayPos;
     37     if (usesAdditionalBuffer) {
     38         readingPos -= mBuffer->getOriginalBufferSize();
     39     }
     40     const int ptNodeCountInArray = PatriciaTrieReadingUtils::getPtNodeArraySizeAndAdvancePosition(
     41             dictBuf, &readingPos);
     42     if (usesAdditionalBuffer) {
     43         readingPos += mBuffer->getOriginalBufferSize();
     44     }
     45     if (ptNodeCountInArray < 0) {
     46         AKLOGE("Invalid PtNode count in an array: %d.", ptNodeCountInArray);
     47         return false;
     48     }
     49     *outPtNodeCount = ptNodeCountInArray;
     50     *outFirstPtNodePos = readingPos;
     51     return true;
     52 }
     53 
     54 bool Ver4PtNodeArrayReader::readForwardLinkAndReturnIfValid(const int forwordLinkPos,
     55         int *const outNextPtNodeArrayPos) const {
     56     if (forwordLinkPos < 0 || forwordLinkPos >= mBuffer->getTailPosition()) {
     57         // Reading invalid position because of bug or broken dictionary.
     58         AKLOGE("Reading forward link from invalid dictionary position: %d, dict size: %d",
     59                 forwordLinkPos, mBuffer->getTailPosition());
     60         ASSERT(false);
     61         return false;
     62     }
     63     const bool usesAdditionalBuffer = mBuffer->isInAdditionalBuffer(forwordLinkPos);
     64     const uint8_t *const dictBuf = mBuffer->getBuffer(usesAdditionalBuffer);
     65     int readingPos = forwordLinkPos;
     66     if (usesAdditionalBuffer) {
     67         readingPos -= mBuffer->getOriginalBufferSize();
     68     }
     69     const int nextPtNodeArrayOffset =
     70             DynamicPtReadingUtils::getForwardLinkPosition(dictBuf, readingPos);
     71     if (DynamicPtReadingUtils::isValidForwardLinkPosition(nextPtNodeArrayOffset)) {
     72         *outNextPtNodeArrayPos = forwordLinkPos + nextPtNodeArrayOffset;
     73     } else {
     74         *outNextPtNodeArrayPos = NOT_A_DICT_POS;
     75     }
     76     return true;
     77 }
     78 
     79 } // namespace latinime
     80