diff options
Diffstat (limited to 'xfa/src/fxbarcode/src/BC_ReedSolomonGF256Poly.cpp')
| -rw-r--r-- | xfa/src/fxbarcode/src/BC_ReedSolomonGF256Poly.cpp | 241 |
1 files changed, 241 insertions, 0 deletions
diff --git a/xfa/src/fxbarcode/src/BC_ReedSolomonGF256Poly.cpp b/xfa/src/fxbarcode/src/BC_ReedSolomonGF256Poly.cpp new file mode 100644 index 0000000000..85c1b5a5bf --- /dev/null +++ b/xfa/src/fxbarcode/src/BC_ReedSolomonGF256Poly.cpp @@ -0,0 +1,241 @@ +// 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
+
+#include "barcode.h"
+#include "include/BC_ReedSolomonGF256.h"
+#include "include/BC_ReedSolomonGF256Poly.h"
+CBC_ReedSolomonGF256Poly::CBC_ReedSolomonGF256Poly(CBC_ReedSolomonGF256* field, FX_INT32 coefficients)
+{
+ if(field == NULL) {
+ return;
+ }
+ m_field = field;
+ m_coefficients.Add(coefficients);
+}
+CBC_ReedSolomonGF256Poly::CBC_ReedSolomonGF256Poly()
+{
+ m_field = NULL;
+}
+void CBC_ReedSolomonGF256Poly::Init(CBC_ReedSolomonGF256* field, CFX_Int32Array* coefficients, FX_INT32 &e)
+{
+ if(coefficients == NULL || coefficients->GetSize() == 0) {
+ e = BCExceptionCoefficientsSizeIsNull;
+ BC_EXCEPTION_CHECK_ReturnVoid(e);
+ }
+ m_field = field;
+ FX_INT32 coefficientsLength = coefficients->GetSize();
+ if((coefficientsLength > 1 && (*coefficients)[0] == 0)) {
+ FX_INT32 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(FX_INT32 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;
+}
+FX_INT32 CBC_ReedSolomonGF256Poly::GetDegree()
+{
+ return m_coefficients.GetSize() - 1;
+}
+FX_BOOL CBC_ReedSolomonGF256Poly::IsZero()
+{
+ return m_coefficients[0] == 0;
+}
+FX_INT32 CBC_ReedSolomonGF256Poly::GetCoefficients(FX_INT32 degree)
+{
+ return m_coefficients[m_coefficients.GetSize() - 1 - degree];
+}
+FX_INT32 CBC_ReedSolomonGF256Poly::EvaluateAt(FX_INT32 a)
+{
+ if(a == 0) {
+ return GetCoefficients(0);
+ }
+ FX_INT32 size = m_coefficients.GetSize();
+ if(a == 1) {
+ FX_INT32 result = 0;
+ for(FX_INT32 i = 0; i < size; i++) {
+ result = CBC_ReedSolomonGF256::AddOrSubtract(result, m_coefficients[i]);
+ }
+ return result;
+ }
+ FX_INT32 result = m_coefficients[0];
+ for(FX_INT32 j = 1; j < size; j++) {
+ result = CBC_ReedSolomonGF256::AddOrSubtract(
+ m_field->Multiply(a, result),
+ m_coefficients[j]);
+ }
+ return result;
+}
+CBC_ReedSolomonGF256Poly *CBC_ReedSolomonGF256Poly::Clone(FX_INT32 &e)
+{
+ CBC_ReedSolomonGF256Poly *temp = FX_NEW CBC_ReedSolomonGF256Poly();
+ temp->Init(m_field, &m_coefficients, e);
+ BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
+ return temp;
+}
+CBC_ReedSolomonGF256Poly* CBC_ReedSolomonGF256Poly::AddOrSubtract(CBC_ReedSolomonGF256Poly* other, FX_INT32 &e)
+{
+ if(IsZero()) {
+ return other->Clone(e);
+ BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
+ }
+ if(other->IsZero()) {
+ return this->Clone(e);
+ BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
+ }
+ 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() );
+ FX_INT32 lengthDiff = largerCoefficients.GetSize() - smallerCoefficients.GetSize();
+ for(FX_INT32 i = 0; i < lengthDiff; i++) {
+ sumDiff[i] = largerCoefficients[i];
+ }
+ for(FX_INT32 j = lengthDiff; j < largerCoefficients.GetSize(); j++) {
+ sumDiff[j] = (CBC_ReedSolomonGF256::AddOrSubtract(smallerCoefficients[j - lengthDiff],
+ largerCoefficients[j]));
+ }
+ CBC_ReedSolomonGF256Poly *temp = FX_NEW CBC_ReedSolomonGF256Poly();
+ temp->Init(m_field, &sumDiff, e);
+ BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
+ return temp;
+}
+CBC_ReedSolomonGF256Poly* CBC_ReedSolomonGF256Poly::Multiply(CBC_ReedSolomonGF256Poly* other, FX_INT32 &e)
+{
+ if(IsZero() || other->IsZero()) {
+ CBC_ReedSolomonGF256Poly *temp = m_field->GetZero()->Clone(e);
+ BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
+ return temp;
+ }
+ CFX_Int32Array aCoefficients ;
+ aCoefficients.Copy(m_coefficients);
+ FX_INT32 aLength = m_coefficients.GetSize();
+ CFX_Int32Array bCoefficients;
+ bCoefficients.Copy(*(other->GetCoefficients()));
+ FX_INT32 bLength = other->GetCoefficients()->GetSize();
+ CFX_Int32Array product;
+ product.SetSize(aLength + bLength - 1);
+ for(FX_INT32 i = 0; i < aLength; i++) {
+ FX_INT32 aCoeff = m_coefficients[i];
+ for(FX_INT32 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 = FX_NEW CBC_ReedSolomonGF256Poly();
+ temp->Init(m_field, &product, e);
+ BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
+ return temp;
+}
+CBC_ReedSolomonGF256Poly* CBC_ReedSolomonGF256Poly::Multiply(FX_INT32 scalar, FX_INT32 &e)
+{
+ if(scalar == 0) {
+ CBC_ReedSolomonGF256Poly *temp = m_field->GetZero()->Clone(e);
+ BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
+ return temp;
+ }
+ if(scalar == 1) {
+ return this->Clone(e);
+ BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
+ }
+ FX_INT32 size = m_coefficients.GetSize();
+ CFX_Int32Array product;
+ product.SetSize(size);
+ for(FX_INT32 i = 0; i < size; i++) {
+ product[i] = m_field->Multiply(m_coefficients[i], scalar);
+ }
+ CBC_ReedSolomonGF256Poly *temp = FX_NEW CBC_ReedSolomonGF256Poly();
+ temp->Init(m_field, &product, e);
+ BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
+ return temp;
+}
+CBC_ReedSolomonGF256Poly* CBC_ReedSolomonGF256Poly::MultiplyByMonomial(FX_INT32 degree, FX_INT32 coefficient, FX_INT32 &e)
+{
+ if(degree < 0) {
+ e = BCExceptionDegreeIsNegative;
+ BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
+ }
+ if(coefficient == 0) {
+ CBC_ReedSolomonGF256Poly *temp = m_field->GetZero()->Clone(e);
+ BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
+ return temp;
+ }
+ FX_INT32 size = m_coefficients.GetSize();
+ CFX_Int32Array product;
+ product.SetSize(size + degree);
+ for(FX_INT32 i = 0; i < size; i++) {
+ product[i] = (m_field->Multiply(m_coefficients[i], coefficient));
+ }
+ CBC_ReedSolomonGF256Poly *temp = FX_NEW CBC_ReedSolomonGF256Poly();
+ temp->Init(m_field, &product, e);
+ BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
+ return temp;
+}
+CFX_PtrArray* CBC_ReedSolomonGF256Poly::Divide(CBC_ReedSolomonGF256Poly *other, FX_INT32 &e)
+{
+ if(other->IsZero()) {
+ e = BCExceptionDivideByZero;
+ BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
+ }
+ CBC_ReedSolomonGF256Poly* rsg1 = m_field->GetZero()->Clone(e);
+ BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
+ CBC_AutoPtr<CBC_ReedSolomonGF256Poly> quotient(rsg1);
+ CBC_ReedSolomonGF256Poly* rsg2 = this->Clone(e);
+ BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
+ CBC_AutoPtr<CBC_ReedSolomonGF256Poly> remainder(rsg2);
+ FX_INT32 denominatorLeadingTerm = other->GetCoefficients(other->GetDegree());
+ FX_INT32 inverseDenominatorLeadingTeam = m_field->Inverse(denominatorLeadingTerm, e);
+ BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
+ FX_BOOL bFirst = TRUE;
+ while(remainder->GetDegree() >= other->GetDegree() && !remainder->IsZero()) {
+ FX_INT32 degreeDifference = remainder->GetDegree() - other->GetDegree();
+ FX_INT32 scale = m_field->Multiply(remainder->GetCoefficients((remainder->GetDegree())),
+ inverseDenominatorLeadingTeam);
+ CBC_ReedSolomonGF256Poly* rsg3 = other->MultiplyByMonomial(degreeDifference, scale, e);
+ BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
+ CBC_AutoPtr<CBC_ReedSolomonGF256Poly> term(rsg3);
+ CBC_ReedSolomonGF256Poly* rsg4 = m_field->BuildMonomial(degreeDifference, scale, e);
+ BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
+ CBC_AutoPtr<CBC_ReedSolomonGF256Poly> iteratorQuotient(rsg4);
+ CBC_ReedSolomonGF256Poly* rsg5 = quotient->AddOrSubtract(iteratorQuotient.get(), e);
+ BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
+ CBC_AutoPtr<CBC_ReedSolomonGF256Poly> temp(rsg5);
+ quotient = temp;
+ CBC_ReedSolomonGF256Poly* rsg6 = remainder->AddOrSubtract(term.get(), e);
+ BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
+ CBC_AutoPtr<CBC_ReedSolomonGF256Poly> temp1(rsg6);
+ remainder = temp1;
+ }
+ CFX_PtrArray* tempPtrA = FX_NEW CFX_PtrArray;
+ tempPtrA->Add(quotient.release());
+ tempPtrA->Add(remainder.release());
+ return tempPtrA;
+}
+CBC_ReedSolomonGF256Poly::~CBC_ReedSolomonGF256Poly()
+{
+ m_coefficients.RemoveAll();
+}
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