// Copyright 2014 PDFium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
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// Original code is licensed as follows:
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/*
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* Copyright 2007 ZXing authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "xfa/fxbarcode/common/reedsolomon/BC_ReedSolomonGF256Poly.h"
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#include <memory>
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#include "xfa/fxbarcode/common/reedsolomon/BC_ReedSolomonGF256.h"
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CBC_ReedSolomonGF256Poly::CBC_ReedSolomonGF256Poly(CBC_ReedSolomonGF256* field,
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int32_t coefficients) {
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if (!field)
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return;
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m_field = field;
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m_coefficients.Add(coefficients);
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}
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CBC_ReedSolomonGF256Poly::CBC_ReedSolomonGF256Poly() {
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m_field = nullptr;
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}
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void CBC_ReedSolomonGF256Poly::Init(CBC_ReedSolomonGF256* field,
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CFX_Int32Array* coefficients,
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int32_t& e) {
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if (!coefficients || coefficients->GetSize() == 0) {
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e = BCExceptionCoefficientsSizeIsNull;
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BC_EXCEPTION_CHECK_ReturnVoid(e);
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}
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m_field = field;
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int32_t coefficientsLength = coefficients->GetSize();
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if ((coefficientsLength > 1 && (*coefficients)[0] == 0)) {
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int32_t firstNonZero = 1;
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while ((firstNonZero < coefficientsLength) &&
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((*coefficients)[firstNonZero] == 0)) {
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firstNonZero++;
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}
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if (firstNonZero == coefficientsLength) {
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m_coefficients.Copy(*(m_field->GetZero()->GetCoefficients()));
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} else {
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m_coefficients.SetSize(coefficientsLength - firstNonZero);
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for (int32_t i = firstNonZero, j = 0; i < coefficientsLength; i++, j++) {
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m_coefficients[j] = coefficients->operator[](i);
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}
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}
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} else {
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m_coefficients.Copy(*coefficients);
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}
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}
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CFX_Int32Array* CBC_ReedSolomonGF256Poly::GetCoefficients() {
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return &m_coefficients;
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}
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int32_t CBC_ReedSolomonGF256Poly::GetDegree() {
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return m_coefficients.GetSize() - 1;
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}
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FX_BOOL CBC_ReedSolomonGF256Poly::IsZero() {
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return m_coefficients[0] == 0;
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}
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int32_t CBC_ReedSolomonGF256Poly::GetCoefficients(int32_t degree) {
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return m_coefficients[m_coefficients.GetSize() - 1 - degree];
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}
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int32_t CBC_ReedSolomonGF256Poly::EvaluateAt(int32_t a) {
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if (a == 0) {
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return GetCoefficients(0);
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}
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int32_t size = m_coefficients.GetSize();
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if (a == 1) {
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int32_t result = 0;
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for (int32_t i = 0; i < size; i++) {
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result = CBC_ReedSolomonGF256::AddOrSubtract(result, m_coefficients[i]);
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}
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return result;
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}
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int32_t result = m_coefficients[0];
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for (int32_t j = 1; j < size; j++) {
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result = CBC_ReedSolomonGF256::AddOrSubtract(m_field->Multiply(a, result),
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m_coefficients[j]);
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}
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return result;
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}
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CBC_ReedSolomonGF256Poly* CBC_ReedSolomonGF256Poly::Clone(int32_t& e) {
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CBC_ReedSolomonGF256Poly* temp = new CBC_ReedSolomonGF256Poly();
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temp->Init(m_field, &m_coefficients, e);
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BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
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return temp;
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}
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CBC_ReedSolomonGF256Poly* CBC_ReedSolomonGF256Poly::AddOrSubtract(
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CBC_ReedSolomonGF256Poly* other,
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int32_t& e) {
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if (IsZero())
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return other->Clone(e);
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if (other->IsZero())
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return Clone(e);
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CFX_Int32Array smallerCoefficients;
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smallerCoefficients.Copy(m_coefficients);
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CFX_Int32Array largerCoefficients;
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largerCoefficients.Copy(*(other->GetCoefficients()));
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if (smallerCoefficients.GetSize() > largerCoefficients.GetSize()) {
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CFX_Int32Array temp;
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temp.Copy(smallerCoefficients);
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smallerCoefficients.Copy(largerCoefficients);
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largerCoefficients.Copy(temp);
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}
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CFX_Int32Array sumDiff;
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sumDiff.SetSize(largerCoefficients.GetSize());
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int32_t lengthDiff =
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largerCoefficients.GetSize() - smallerCoefficients.GetSize();
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for (int32_t i = 0; i < lengthDiff; i++) {
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sumDiff[i] = largerCoefficients[i];
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}
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for (int32_t j = lengthDiff; j < largerCoefficients.GetSize(); j++) {
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sumDiff[j] = (CBC_ReedSolomonGF256::AddOrSubtract(
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smallerCoefficients[j - lengthDiff], largerCoefficients[j]));
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}
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CBC_ReedSolomonGF256Poly* temp = new CBC_ReedSolomonGF256Poly();
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temp->Init(m_field, &sumDiff, e);
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BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
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return temp;
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}
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CBC_ReedSolomonGF256Poly* CBC_ReedSolomonGF256Poly::Multiply(
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CBC_ReedSolomonGF256Poly* other,
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int32_t& e) {
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if (IsZero() || other->IsZero())
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return m_field->GetZero()->Clone(e);
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CFX_Int32Array aCoefficients;
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aCoefficients.Copy(m_coefficients);
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int32_t aLength = m_coefficients.GetSize();
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CFX_Int32Array bCoefficients;
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bCoefficients.Copy(*(other->GetCoefficients()));
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int32_t bLength = other->GetCoefficients()->GetSize();
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CFX_Int32Array product;
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product.SetSize(aLength + bLength - 1);
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for (int32_t i = 0; i < aLength; i++) {
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int32_t aCoeff = m_coefficients[i];
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for (int32_t j = 0; j < bLength; j++) {
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product[i + j] = CBC_ReedSolomonGF256::AddOrSubtract(
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product[i + j],
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m_field->Multiply(aCoeff, other->GetCoefficients()->operator[](j)));
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}
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}
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CBC_ReedSolomonGF256Poly* temp = new CBC_ReedSolomonGF256Poly();
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temp->Init(m_field, &product, e);
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BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
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return temp;
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}
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CBC_ReedSolomonGF256Poly* CBC_ReedSolomonGF256Poly::Multiply(int32_t scalar,
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int32_t& e) {
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if (scalar == 0)
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return m_field->GetZero()->Clone(e);
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if (scalar == 1)
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return Clone(e);
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int32_t size = m_coefficients.GetSize();
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CFX_Int32Array product;
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product.SetSize(size);
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for (int32_t i = 0; i < size; i++) {
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product[i] = m_field->Multiply(m_coefficients[i], scalar);
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}
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CBC_ReedSolomonGF256Poly* temp = new CBC_ReedSolomonGF256Poly();
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temp->Init(m_field, &product, e);
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BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
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return temp;
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}
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CBC_ReedSolomonGF256Poly* CBC_ReedSolomonGF256Poly::MultiplyByMonomial(
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int32_t degree,
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int32_t coefficient,
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int32_t& e) {
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if (degree < 0) {
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e = BCExceptionDegreeIsNegative;
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return nullptr;
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}
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if (coefficient == 0)
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return m_field->GetZero()->Clone(e);
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int32_t size = m_coefficients.GetSize();
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CFX_Int32Array product;
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product.SetSize(size + degree);
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for (int32_t i = 0; i < size; i++) {
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product[i] = (m_field->Multiply(m_coefficients[i], coefficient));
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}
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CBC_ReedSolomonGF256Poly* temp = new CBC_ReedSolomonGF256Poly();
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temp->Init(m_field, &product, e);
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BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
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return temp;
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}
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CFX_ArrayTemplate<CBC_ReedSolomonGF256Poly*>* CBC_ReedSolomonGF256Poly::Divide(
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CBC_ReedSolomonGF256Poly* other,
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int32_t& e) {
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if (other->IsZero()) {
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e = BCExceptionDivideByZero;
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return nullptr;
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}
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std::unique_ptr<CBC_ReedSolomonGF256Poly> quotient(
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m_field->GetZero()->Clone(e));
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BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
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std::unique_ptr<CBC_ReedSolomonGF256Poly> remainder(Clone(e));
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BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
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int32_t denominatorLeadingTerm = other->GetCoefficients(other->GetDegree());
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int32_t inverseDenominatorLeadingTeam =
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m_field->Inverse(denominatorLeadingTerm, e);
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BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
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while (remainder->GetDegree() >= other->GetDegree() && !remainder->IsZero()) {
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int32_t degreeDifference = remainder->GetDegree() - other->GetDegree();
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int32_t scale =
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m_field->Multiply(remainder->GetCoefficients((remainder->GetDegree())),
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inverseDenominatorLeadingTeam);
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std::unique_ptr<CBC_ReedSolomonGF256Poly> term(
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other->MultiplyByMonomial(degreeDifference, scale, e));
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BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
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std::unique_ptr<CBC_ReedSolomonGF256Poly> iteratorQuotient(
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m_field->BuildMonomial(degreeDifference, scale, e));
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BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
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quotient.reset(quotient->AddOrSubtract(iteratorQuotient.get(), e));
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BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
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remainder.reset(remainder->AddOrSubtract(term.get(), e));
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BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
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}
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CFX_ArrayTemplate<CBC_ReedSolomonGF256Poly*>* tempPtrA =
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new CFX_ArrayTemplate<CBC_ReedSolomonGF256Poly*>();
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tempPtrA->Add(quotient.release());
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tempPtrA->Add(remainder.release());
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return tempPtrA;
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}
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CBC_ReedSolomonGF256Poly::~CBC_ReedSolomonGF256Poly() {
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m_coefficients.RemoveAll();
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}
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