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
28CBC_ReedSolomonGF256* CBC_ReedSolomonGF256::QRCodeField = nullptr;
29CBC_ReedSolomonGF256* CBC_ReedSolomonGF256::DataMatrixField = nullptr;
30
31void CBC_ReedSolomonGF256::Initialize() {
32  QRCodeField = new CBC_ReedSolomonGF256(0x011D);
33  QRCodeField->Init();
34  DataMatrixField = new CBC_ReedSolomonGF256(0x012D);
35  DataMatrixField->Init();
36}
37
38void CBC_ReedSolomonGF256::Finalize() {
39  delete QRCodeField;
40  QRCodeField = nullptr;
41  delete DataMatrixField;
42  DataMatrixField = nullptr;
43}
44
45CBC_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
60void CBC_ReedSolomonGF256::Init() {
61  m_zero = pdfium::MakeUnique<CBC_ReedSolomonGF256Poly>(this, 0);
62  m_one = pdfium::MakeUnique<CBC_ReedSolomonGF256Poly>(this, 1);
63}
64
65CBC_ReedSolomonGF256::~CBC_ReedSolomonGF256() {}
66
67CBC_ReedSolomonGF256Poly* CBC_ReedSolomonGF256::GetZero() const {
68  return m_zero.get();
69}
70
71CBC_ReedSolomonGF256Poly* CBC_ReedSolomonGF256::GetOne() const {
72  return m_one.get();
73}
74
75CBC_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
99int32_t CBC_ReedSolomonGF256::AddOrSubtract(int32_t a, int32_t b) {
100  return a ^ b;
101}
102
103int32_t CBC_ReedSolomonGF256::Exp(int32_t a) {
104  return m_expTable[a];
105}
106
107int32_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
115int32_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
123int32_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