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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 "../barcode.h"
#include "../common/BC_CommonBitMatrix.h"
#include "../common/reedsolomon/BC_ReedSolomonDecoder.h"
#include "../common/reedsolomon/BC_ReedSolomonGF256.h"
#include "BC_DataMatrixDecoder.h"
#include "BC_DataMatrixBitMatrixParser.h"
#include "BC_DataMatrixVersion.h"
#include "BC_DataMatrixDataBlock.h"
#include "BC_DataMatrixDecodedBitStreamParser.h"
CBC_DataMatrixDecoder::CBC_DataMatrixDecoder()
{
m_rsDecoder = NULL;
}
void CBC_DataMatrixDecoder::Init()
{
m_rsDecoder = FX_NEW CBC_ReedSolomonDecoder(CBC_ReedSolomonGF256::DataMatrixField);
}
CBC_DataMatrixDecoder::~CBC_DataMatrixDecoder()
{
if(m_rsDecoder != NULL) {
delete m_rsDecoder;
}
m_rsDecoder = NULL;
}
CBC_CommonDecoderResult *CBC_DataMatrixDecoder::Decode(CBC_CommonBitMatrix *bits, FX_INT32 &e)
{
CBC_DataMatrixBitMatrixParser parser;
parser.Init(bits, e);
BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
CBC_DataMatrixVersion *version = parser.GetVersion();
CFX_ByteArray* byteTemp = parser.ReadCodewords(e);
BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
CBC_AutoPtr<CFX_ByteArray> codewords(byteTemp);
CFX_PtrArray *dataBlocks = CBC_DataMatrixDataBlock::GetDataBlocks(codewords.get(), version, e);
BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
FX_INT32 dataBlocksCount = dataBlocks->GetSize();
FX_INT32 totalBytes = 0;
FX_INT32 i, j;
for (i = 0; i < dataBlocksCount; i++) {
totalBytes += ((CBC_DataMatrixDataBlock*)(*dataBlocks)[i])->GetNumDataCodewords();
}
CFX_ByteArray resultBytes;
resultBytes.SetSize(totalBytes);
for (j = 0; j < dataBlocksCount; j++) {
CFX_ByteArray *codewordBytes = ((CBC_DataMatrixDataBlock*)(*dataBlocks)[j])->GetCodewords();
FX_INT32 numDataCodewords = ((CBC_DataMatrixDataBlock*)(*dataBlocks)[j])->GetNumDataCodewords();
CorrectErrors(*codewordBytes, numDataCodewords, e);
if (e != BCExceptionNO) {
for(FX_INT32 i = 0; i < dataBlocks->GetSize(); i++) {
delete (CBC_DataMatrixDataBlock*)(*dataBlocks)[i];
}
delete dataBlocks;
dataBlocks = NULL;
return NULL;
}
FX_INT32 i;
for (i = 0; i < numDataCodewords; i++) {
resultBytes[i * dataBlocksCount + j] = (*codewordBytes)[i];
}
}
for(i = 0; i < (dataBlocks->GetSize()); i++) {
delete (CBC_DataMatrixDataBlock*)(*dataBlocks)[i];
}
delete dataBlocks;
dataBlocks = NULL;
CBC_CommonDecoderResult *resultR = CBC_DataMatrixDecodedBitStreamParser::Decode(resultBytes, e);
BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
return resultR;
}
void CBC_DataMatrixDecoder::CorrectErrors(CFX_ByteArray &codewordBytes, FX_INT32 numDataCodewords, FX_INT32 &e)
{
FX_INT32 numCodewords = codewordBytes.GetSize();
CFX_Int32Array codewordsInts;
codewordsInts.SetSize(numCodewords);
FX_INT32 i;
for (i = 0; i < numCodewords; i++) {
codewordsInts[i] = codewordBytes[i] & 0xFF;
}
FX_INT32 numECCodewords = codewordBytes.GetSize() - numDataCodewords;
m_rsDecoder->Decode(&codewordsInts, numECCodewords, e);
if (e != BCExceptionNO) {
e = BCExceptionChecksumException;
return ;
}
for (i = 0; i < numDataCodewords; i++) {
codewordBytes[i] = (FX_BYTE) codewordsInts[i];
}
}
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