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/fxbarcode/common/reedsolomon/BC_ReedSolomonGF256.h"
24
25 #include "third_party/base/ptr_util.h"
26 #include "xfa/fxbarcode/common/reedsolomon/BC_ReedSolomonGF256Poly.h"
27
28 CBC_ReedSolomonGF256* CBC_ReedSolomonGF256::QRCodeField = nullptr;
29 CBC_ReedSolomonGF256* CBC_ReedSolomonGF256::DataMatrixField = nullptr;
30
Initialize()31 void CBC_ReedSolomonGF256::Initialize() {
32 QRCodeField = new CBC_ReedSolomonGF256(0x011D);
33 QRCodeField->Init();
34 DataMatrixField = new CBC_ReedSolomonGF256(0x012D);
35 DataMatrixField->Init();
36 }
37
Finalize()38 void CBC_ReedSolomonGF256::Finalize() {
39 delete QRCodeField;
40 QRCodeField = nullptr;
41 delete DataMatrixField;
42 DataMatrixField = nullptr;
43 }
44
CBC_ReedSolomonGF256(int32_t primitive)45 CBC_ReedSolomonGF256::CBC_ReedSolomonGF256(int32_t primitive) {
46 int32_t x = 1;
47 for (int32_t j = 0; j < 256; j++) {
48 m_expTable[j] = x;
49 x <<= 1;
50 if (x >= 0x100) {
51 x ^= primitive;
52 }
53 }
54 for (int32_t i = 0; i < 255; i++) {
55 m_logTable[m_expTable[i]] = i;
56 }
57 m_logTable[0] = 0;
58 }
59
Init()60 void CBC_ReedSolomonGF256::Init() {
61 m_zero = pdfium::MakeUnique<CBC_ReedSolomonGF256Poly>(this, 0);
62 m_one = pdfium::MakeUnique<CBC_ReedSolomonGF256Poly>(this, 1);
63 }
64
~CBC_ReedSolomonGF256()65 CBC_ReedSolomonGF256::~CBC_ReedSolomonGF256() {}
66
GetZero() const67 CBC_ReedSolomonGF256Poly* CBC_ReedSolomonGF256::GetZero() const {
68 return m_zero.get();
69 }
70
GetOne() const71 CBC_ReedSolomonGF256Poly* CBC_ReedSolomonGF256::GetOne() const {
72 return m_one.get();
73 }
74
BuildMonomial(int32_t degree,int32_t coefficient,int32_t & e)75 CBC_ReedSolomonGF256Poly* CBC_ReedSolomonGF256::BuildMonomial(
76 int32_t degree,
77 int32_t coefficient,
78 int32_t& e) {
79 if (degree < 0) {
80 e = BCExceptionDegreeIsNegative;
81 return nullptr;
82 }
83 if (coefficient == 0) {
84 CBC_ReedSolomonGF256Poly* temp = m_zero->Clone(e);
85 if (e != BCExceptionNO)
86 return nullptr;
87 return temp;
88 }
89 CFX_ArrayTemplate<int32_t> coefficients;
90 coefficients.SetSize(degree + 1);
91 coefficients[0] = coefficient;
92 CBC_ReedSolomonGF256Poly* temp = new CBC_ReedSolomonGF256Poly();
93 temp->Init(this, &coefficients, e);
94 if (e != BCExceptionNO)
95 return nullptr;
96 return temp;
97 }
98
AddOrSubtract(int32_t a,int32_t b)99 int32_t CBC_ReedSolomonGF256::AddOrSubtract(int32_t a, int32_t b) {
100 return a ^ b;
101 }
102
Exp(int32_t a)103 int32_t CBC_ReedSolomonGF256::Exp(int32_t a) {
104 return m_expTable[a];
105 }
106
Log(int32_t a,int32_t & e)107 int32_t CBC_ReedSolomonGF256::Log(int32_t a, int32_t& e) {
108 if (a == 0) {
109 e = BCExceptionAIsZero;
110 return 0;
111 }
112 return m_logTable[a];
113 }
114
Inverse(int32_t a,int32_t & e)115 int32_t CBC_ReedSolomonGF256::Inverse(int32_t a, int32_t& e) {
116 if (a == 0) {
117 e = BCExceptionAIsZero;
118 return 0;
119 }
120 return m_expTable[255 - m_logTable[a]];
121 }
122
Multiply(int32_t a,int32_t b)123 int32_t CBC_ReedSolomonGF256::Multiply(int32_t a, int32_t b) {
124 if (a == 0 || b == 0) {
125 return 0;
126 }
127 if (a == 1) {
128 return b;
129 }
130 if (b == 1) {
131 return a;
132 }
133 return m_expTable[(m_logTable[a] + m_logTable[b]) % 255];
134 }
135