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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 2012 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/pdf417/BC_PDF417Common.h" | |
| 24 #include "xfa/src/fxbarcode/pdf417/BC_PDF417ECModulusGF.h" | |
| 25 #include "xfa/src/fxbarcode/pdf417/BC_PDF417ECModulusPoly.h" | |
| 26 #include "xfa/src/fxbarcode/utils.h" | |
| 27 | |
| 28 CBC_PDF417ECModulusGF* CBC_PDF417ECModulusGF::PDF417_GF = NULL; | |
| 29 void CBC_PDF417ECModulusGF::Initialize(int32_t& e) { | |
| 30 PDF417_GF = | |
| 31 new CBC_PDF417ECModulusGF(CBC_PDF417Common::NUMBER_OF_CODEWORDS, 3, e); | |
| 32 } | |
| 33 void CBC_PDF417ECModulusGF::Finalize() { | |
| 34 delete PDF417_GF; | |
| 35 } | |
| 36 CBC_PDF417ECModulusGF::CBC_PDF417ECModulusGF(int32_t modulus, | |
| 37 int32_t generator, | |
| 38 int32_t& e) { | |
| 39 m_modulus = modulus; | |
| 40 m_expTable.SetSize(modulus); | |
| 41 m_logTable.SetSize(modulus); | |
| 42 int32_t x = 1; | |
| 43 for (int32_t i = 0; i < modulus; i++) { | |
| 44 m_expTable[i] = x; | |
| 45 x = (x * generator) % modulus; | |
| 46 } | |
| 47 for (int32_t j = 0; j < modulus - 1; j++) { | |
| 48 m_logTable[m_expTable[j]] = j; | |
| 49 } | |
| 50 CFX_Int32Array zero; | |
| 51 zero.Add(0); | |
| 52 m_zero = new CBC_PDF417ECModulusPoly(this, zero, e); | |
| 53 CFX_Int32Array one; | |
| 54 one.Add(1); | |
| 55 m_one = new CBC_PDF417ECModulusPoly(this, one, e); | |
| 56 } | |
| 57 CBC_PDF417ECModulusGF::~CBC_PDF417ECModulusGF() { | |
| 58 delete m_zero; | |
| 59 delete m_one; | |
| 60 } | |
| 61 CBC_PDF417ECModulusPoly* CBC_PDF417ECModulusGF::getZero() { | |
| 62 return m_zero; | |
| 63 } | |
| 64 CBC_PDF417ECModulusPoly* CBC_PDF417ECModulusGF::getOne() { | |
| 65 return m_one; | |
| 66 } | |
| 67 CBC_PDF417ECModulusPoly* CBC_PDF417ECModulusGF::buildMonomial( | |
| 68 int32_t degree, | |
| 69 int32_t coefficient, | |
| 70 int32_t& e) { | |
| 71 if (degree < 0) { | |
| 72 e = BCExceptionIllegalArgument; | |
| 73 return NULL; | |
| 74 } | |
| 75 CBC_PDF417ECModulusPoly* modulusPoly = NULL; | |
| 76 if (coefficient == 0) { | |
| 77 modulusPoly = new CBC_PDF417ECModulusPoly(m_zero->getField(), | |
| 78 m_zero->getCoefficients(), e); | |
| 79 BC_EXCEPTION_CHECK_ReturnValue(e, NULL); | |
| 80 return modulusPoly; | |
| 81 } | |
| 82 CFX_Int32Array coefficients; | |
| 83 coefficients.SetSize(degree + 1); | |
| 84 coefficients[0] = coefficient; | |
| 85 modulusPoly = new CBC_PDF417ECModulusPoly(this, coefficients, e); | |
| 86 BC_EXCEPTION_CHECK_ReturnValue(e, NULL); | |
| 87 return modulusPoly; | |
| 88 } | |
| 89 int32_t CBC_PDF417ECModulusGF::add(int32_t a, int32_t b) { | |
| 90 return (a + b) % m_modulus; | |
| 91 } | |
| 92 int32_t CBC_PDF417ECModulusGF::subtract(int32_t a, int32_t b) { | |
| 93 return (m_modulus + a - b) % m_modulus; | |
| 94 } | |
| 95 int32_t CBC_PDF417ECModulusGF::exp(int32_t a) { | |
| 96 return m_expTable[a]; | |
| 97 } | |
| 98 int32_t CBC_PDF417ECModulusGF::log(int32_t a, int32_t& e) { | |
| 99 if (a == 0) { | |
| 100 e = BCExceptionIllegalArgument; | |
| 101 return -1; | |
| 102 } | |
| 103 return m_logTable[a]; | |
| 104 } | |
| 105 int32_t CBC_PDF417ECModulusGF::inverse(int32_t a, int32_t& e) { | |
| 106 if (a == 0) { | |
| 107 e = BCExceptionIllegalArgument; | |
| 108 return -1; | |
| 109 } | |
| 110 return m_expTable[m_modulus - m_logTable[a] - 1]; | |
| 111 } | |
| 112 int32_t CBC_PDF417ECModulusGF::multiply(int32_t a, int32_t b) { | |
| 113 if (a == 0 || b == 0) { | |
| 114 return 0; | |
| 115 } | |
| 116 return m_expTable[(m_logTable[a] + m_logTable[b]) % (m_modulus - 1)]; | |
| 117 } | |
| 118 int32_t CBC_PDF417ECModulusGF::getSize() { | |
| 119 return m_modulus; | |
| 120 } | |
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