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// Copyright 2014 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
// Original code is licensed as follows:
/*
* Copyright 2007 ZXing authors
*
* 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.
*/
#include "xfa/fxbarcode/datamatrix/BC_DataMatrixDecoder.h"
#include <memory>
#include "xfa/fxbarcode/common/BC_CommonBitMatrix.h"
#include "xfa/fxbarcode/common/reedsolomon/BC_ReedSolomonDecoder.h"
#include "xfa/fxbarcode/common/reedsolomon/BC_ReedSolomonGF256.h"
#include "xfa/fxbarcode/datamatrix/BC_DataMatrixBitMatrixParser.h"
#include "xfa/fxbarcode/datamatrix/BC_DataMatrixDataBlock.h"
#include "xfa/fxbarcode/datamatrix/BC_DataMatrixDecodedBitStreamParser.h"
#include "xfa/fxbarcode/datamatrix/BC_DataMatrixVersion.h"
CBC_DataMatrixDecoder::CBC_DataMatrixDecoder() {
m_rsDecoder = NULL;
}
void CBC_DataMatrixDecoder::Init() {
m_rsDecoder =
new CBC_ReedSolomonDecoder(CBC_ReedSolomonGF256::DataMatrixField);
}
CBC_DataMatrixDecoder::~CBC_DataMatrixDecoder() {
delete m_rsDecoder;
}
CBC_CommonDecoderResult* CBC_DataMatrixDecoder::Decode(
CBC_CommonBitMatrix* bits,
int32_t& e) {
CBC_DataMatrixBitMatrixParser parser;
parser.Init(bits, e);
BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
CBC_DataMatrixVersion* version = parser.GetVersion();
std::unique_ptr<CFX_ByteArray> codewords(parser.ReadCodewords(e));
BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
CFX_ArrayTemplate<CBC_DataMatrixDataBlock*>* dataBlocks =
CBC_DataMatrixDataBlock::GetDataBlocks(codewords.get(), version, e);
BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
int32_t dataBlocksCount = dataBlocks->GetSize();
int32_t totalBytes = 0;
for (int32_t i = 0; i < dataBlocksCount; i++) {
totalBytes += (*dataBlocks)[i]->GetNumDataCodewords();
}
CFX_ByteArray resultBytes;
resultBytes.SetSize(totalBytes);
for (int32_t j = 0; j < dataBlocksCount; j++) {
CFX_ByteArray* codewordBytes = (*dataBlocks)[j]->GetCodewords();
int32_t numDataCodewords = (*dataBlocks)[j]->GetNumDataCodewords();
CorrectErrors(*codewordBytes, numDataCodewords, e);
if (e != BCExceptionNO) {
for (int32_t i = 0; i < dataBlocks->GetSize(); i++) {
delete (*dataBlocks)[i];
}
delete dataBlocks;
return nullptr;
}
for (int32_t i = 0; i < numDataCodewords; i++) {
resultBytes[i * dataBlocksCount + j] = (*codewordBytes)[i];
}
}
for (int32_t i = 0; i < (dataBlocks->GetSize()); i++) {
delete (*dataBlocks)[i];
}
delete dataBlocks;
CBC_CommonDecoderResult* resultR =
CBC_DataMatrixDecodedBitStreamParser::Decode(resultBytes, e);
BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
return resultR;
}
void CBC_DataMatrixDecoder::CorrectErrors(CFX_ByteArray& codewordBytes,
int32_t numDataCodewords,
int32_t& e) {
int32_t numCodewords = codewordBytes.GetSize();
CFX_Int32Array codewordsInts;
codewordsInts.SetSize(numCodewords);
int32_t i;
for (i = 0; i < numCodewords; i++) {
codewordsInts[i] = codewordBytes[i] & 0xFF;
}
int32_t numECCodewords = codewordBytes.GetSize() - numDataCodewords;
m_rsDecoder->Decode(&codewordsInts, numECCodewords, e);
if (e != BCExceptionNO) {
e = BCExceptionChecksumException;
return;
}
for (i = 0; i < numDataCodewords; i++) {
codewordBytes[i] = (uint8_t)codewordsInts[i];
}
}
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