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1 // Copyright 2014 PDFium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com | |
6 // Original code is licensed as follows: | |
7 /* | |
8 * Copyright 2007 ZXing authors | |
9 * | |
10 * Licensed under the Apache License, Version 2.0 (the "License"); | |
11 * you may not use this file except in compliance with the License. | |
12 * You may obtain a copy of the License at | |
13 * | |
14 * http://www.apache.org/licenses/LICENSE-2.0 | |
15 * | |
16 * Unless required by applicable law or agreed to in writing, software | |
17 * distributed under the License is distributed on an "AS IS" BASIS, | |
18 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
19 * See the License for the specific language governing permissions and | |
20 * limitations under the License. | |
21 */ | |
22 | |
23 #include "xfa/src/fxbarcode/datamatrix/BC_DataMatrixDecoder.h" | |
24 | |
25 #include <memory> | |
26 | |
27 #include "xfa/src/fxbarcode/common/BC_CommonBitMatrix.h" | |
28 #include "xfa/src/fxbarcode/common/reedsolomon/BC_ReedSolomonDecoder.h" | |
29 #include "xfa/src/fxbarcode/common/reedsolomon/BC_ReedSolomonGF256.h" | |
30 #include "xfa/src/fxbarcode/datamatrix/BC_DataMatrixBitMatrixParser.h" | |
31 #include "xfa/src/fxbarcode/datamatrix/BC_DataMatrixDataBlock.h" | |
32 #include "xfa/src/fxbarcode/datamatrix/BC_DataMatrixDecodedBitStreamParser.h" | |
33 #include "xfa/src/fxbarcode/datamatrix/BC_DataMatrixVersion.h" | |
34 | |
35 CBC_DataMatrixDecoder::CBC_DataMatrixDecoder() { | |
36 m_rsDecoder = NULL; | |
37 } | |
38 void CBC_DataMatrixDecoder::Init() { | |
39 m_rsDecoder = | |
40 new CBC_ReedSolomonDecoder(CBC_ReedSolomonGF256::DataMatrixField); | |
41 } | |
42 CBC_DataMatrixDecoder::~CBC_DataMatrixDecoder() { | |
43 delete m_rsDecoder; | |
44 } | |
45 CBC_CommonDecoderResult* CBC_DataMatrixDecoder::Decode( | |
46 CBC_CommonBitMatrix* bits, | |
47 int32_t& e) { | |
48 CBC_DataMatrixBitMatrixParser parser; | |
49 parser.Init(bits, e); | |
50 BC_EXCEPTION_CHECK_ReturnValue(e, NULL); | |
51 CBC_DataMatrixVersion* version = parser.GetVersion(); | |
52 std::unique_ptr<CFX_ByteArray> codewords(parser.ReadCodewords(e)); | |
53 BC_EXCEPTION_CHECK_ReturnValue(e, NULL); | |
54 CFX_PtrArray* dataBlocks = | |
55 CBC_DataMatrixDataBlock::GetDataBlocks(codewords.get(), version, e); | |
56 BC_EXCEPTION_CHECK_ReturnValue(e, NULL); | |
57 int32_t dataBlocksCount = dataBlocks->GetSize(); | |
58 int32_t totalBytes = 0; | |
59 int32_t i, j; | |
60 for (i = 0; i < dataBlocksCount; i++) { | |
61 totalBytes += | |
62 ((CBC_DataMatrixDataBlock*)(*dataBlocks)[i])->GetNumDataCodewords(); | |
63 } | |
64 CFX_ByteArray resultBytes; | |
65 resultBytes.SetSize(totalBytes); | |
66 for (j = 0; j < dataBlocksCount; j++) { | |
67 CFX_ByteArray* codewordBytes = | |
68 ((CBC_DataMatrixDataBlock*)(*dataBlocks)[j])->GetCodewords(); | |
69 int32_t numDataCodewords = | |
70 ((CBC_DataMatrixDataBlock*)(*dataBlocks)[j])->GetNumDataCodewords(); | |
71 CorrectErrors(*codewordBytes, numDataCodewords, e); | |
72 if (e != BCExceptionNO) { | |
73 for (int32_t i = 0; i < dataBlocks->GetSize(); i++) { | |
74 delete (CBC_DataMatrixDataBlock*)(*dataBlocks)[i]; | |
75 } | |
76 delete dataBlocks; | |
77 dataBlocks = NULL; | |
78 return NULL; | |
79 } | |
80 int32_t i; | |
81 for (i = 0; i < numDataCodewords; i++) { | |
82 resultBytes[i * dataBlocksCount + j] = (*codewordBytes)[i]; | |
83 } | |
84 } | |
85 for (i = 0; i < (dataBlocks->GetSize()); i++) { | |
86 delete (CBC_DataMatrixDataBlock*)(*dataBlocks)[i]; | |
87 } | |
88 delete dataBlocks; | |
89 dataBlocks = NULL; | |
90 CBC_CommonDecoderResult* resultR = | |
91 CBC_DataMatrixDecodedBitStreamParser::Decode(resultBytes, e); | |
92 BC_EXCEPTION_CHECK_ReturnValue(e, NULL); | |
93 return resultR; | |
94 } | |
95 void CBC_DataMatrixDecoder::CorrectErrors(CFX_ByteArray& codewordBytes, | |
96 int32_t numDataCodewords, | |
97 int32_t& e) { | |
98 int32_t numCodewords = codewordBytes.GetSize(); | |
99 CFX_Int32Array codewordsInts; | |
100 codewordsInts.SetSize(numCodewords); | |
101 int32_t i; | |
102 for (i = 0; i < numCodewords; i++) { | |
103 codewordsInts[i] = codewordBytes[i] & 0xFF; | |
104 } | |
105 int32_t numECCodewords = codewordBytes.GetSize() - numDataCodewords; | |
106 m_rsDecoder->Decode(&codewordsInts, numECCodewords, e); | |
107 if (e != BCExceptionNO) { | |
108 e = BCExceptionChecksumException; | |
109 return; | |
110 } | |
111 for (i = 0; i < numDataCodewords; i++) { | |
112 codewordBytes[i] = (uint8_t)codewordsInts[i]; | |
113 } | |
114 } | |
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