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