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/barcode.h"
24 #include "BC_ReedSolomonGF256.h"
25 #include "BC_ReedSolomonGF256Poly.h"
26 #include "BC_ReedSolomon.h"
CBC_ReedSolomonEncoder(CBC_ReedSolomonGF256 * field)27 CBC_ReedSolomonEncoder::CBC_ReedSolomonEncoder(CBC_ReedSolomonGF256* field) {
28 m_field = field;
29 }
Init()30 void CBC_ReedSolomonEncoder::Init() {
31 m_cachedGenerators.Add(new CBC_ReedSolomonGF256Poly(m_field, 1));
32 }
BuildGenerator(int32_t degree,int32_t & e)33 CBC_ReedSolomonGF256Poly* CBC_ReedSolomonEncoder::BuildGenerator(int32_t degree,
34 int32_t& e) {
35 if (degree >= m_cachedGenerators.GetSize()) {
36 CBC_ReedSolomonGF256Poly* lastGenerator =
37 (CBC_ReedSolomonGF256Poly*)(m_cachedGenerators
38 [m_cachedGenerators.GetSize() - 1]);
39 for (int32_t d = m_cachedGenerators.GetSize(); d <= degree; d++) {
40 CFX_Int32Array temp;
41 temp.Add(1);
42 temp.Add(m_field->Exp(d - 1));
43 CBC_ReedSolomonGF256Poly temp_poly;
44 temp_poly.Init(m_field, &temp, e);
45 BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
46 CBC_ReedSolomonGF256Poly* nextGenerator =
47 lastGenerator->Multiply(&temp_poly, e);
48 BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
49 m_cachedGenerators.Add(nextGenerator);
50 lastGenerator = nextGenerator;
51 }
52 }
53 return (CBC_ReedSolomonGF256Poly*)(m_cachedGenerators[degree]);
54 }
Encode(CFX_Int32Array * toEncode,int32_t ecBytes,int32_t & e)55 void CBC_ReedSolomonEncoder::Encode(CFX_Int32Array* toEncode,
56 int32_t ecBytes,
57 int32_t& e) {
58 if (ecBytes == 0) {
59 e = BCExceptionNoCorrectionBytes;
60 BC_EXCEPTION_CHECK_ReturnVoid(e);
61 }
62 int32_t dataBytes = toEncode->GetSize() - ecBytes;
63 if (dataBytes <= 0) {
64 e = BCExceptionNoDataBytesProvided;
65 BC_EXCEPTION_CHECK_ReturnVoid(e);
66 }
67 CBC_ReedSolomonGF256Poly* generator = BuildGenerator(ecBytes, e);
68 BC_EXCEPTION_CHECK_ReturnVoid(e);
69 CFX_Int32Array infoCoefficients;
70 infoCoefficients.SetSize(dataBytes);
71 for (int32_t x = 0; x < dataBytes; x++) {
72 infoCoefficients[x] = toEncode->operator[](x);
73 }
74 CBC_ReedSolomonGF256Poly info;
75 info.Init(m_field, &infoCoefficients, e);
76 BC_EXCEPTION_CHECK_ReturnVoid(e);
77 CBC_ReedSolomonGF256Poly* rsg = info.MultiplyByMonomial(ecBytes, 1, e);
78 BC_EXCEPTION_CHECK_ReturnVoid(e);
79 CBC_AutoPtr<CBC_ReedSolomonGF256Poly> infoTemp(rsg);
80 CFX_PtrArray* pa = infoTemp->Divide(generator, e);
81 BC_EXCEPTION_CHECK_ReturnVoid(e);
82 CBC_AutoPtr<CFX_PtrArray> temp(pa);
83 CBC_ReedSolomonGF256Poly* remainder =
84 (CBC_ReedSolomonGF256Poly*)(temp->operator[](1));
85 CFX_Int32Array* coefficients = remainder->GetCoefficients();
86 int32_t numZeroCoefficients = ecBytes - coefficients->GetSize();
87 for (int32_t i = 0; i < numZeroCoefficients; i++) {
88 (*toEncode)[dataBytes + i] = 0;
89 }
90 for (int32_t y = 0; y < coefficients->GetSize(); y++) {
91 (*toEncode)[dataBytes + numZeroCoefficients + y] =
92 coefficients->operator[](y);
93 }
94 for (int32_t k = 0; k < temp->GetSize(); k++) {
95 delete (CBC_ReedSolomonGF256Poly*)(*temp)[k];
96 }
97 }
~CBC_ReedSolomonEncoder()98 CBC_ReedSolomonEncoder::~CBC_ReedSolomonEncoder() {
99 for (int32_t i = 0; i < m_cachedGenerators.GetSize(); i++) {
100 delete (CBC_ReedSolomonGF256Poly*)m_cachedGenerators[i];
101 }
102 }
103