// 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]; | |
} | |
} |