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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 2012 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 "../barcode.h"
#include "BC_PDF417Common.h"
#include "BC_PDF417ECModulusGF.h"
#include "BC_PDF417ECModulusPoly.h"
CBC_PDF417ECModulusPoly::CBC_PDF417ECModulusPoly(CBC_PDF417ECModulusGF* field, CFX_Int32Array &coefficients, FX_INT32 &e)
{
if (coefficients.GetSize() == 0) {
e = BCExceptionIllegalArgument;
}
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 = field->getZero()->m_coefficients;
} else {
m_coefficients.SetSize(coefficientsLength - firstNonZero);
FX_INT32 l = 0;
for (FX_INT32 i = firstNonZero; i < firstNonZero + m_coefficients.GetSize(); i++) {
m_coefficients.SetAt(l, coefficients.GetAt(i));
l++;
}
}
} else {
m_coefficients.Copy(coefficients);
}
}
CBC_PDF417ECModulusPoly::~CBC_PDF417ECModulusPoly()
{
}
CFX_Int32Array& CBC_PDF417ECModulusPoly::getCoefficients()
{
return m_coefficients;
}
CBC_PDF417ECModulusGF* CBC_PDF417ECModulusPoly::getField()
{
return m_field;
}
FX_INT32 CBC_PDF417ECModulusPoly::getDegree()
{
return m_coefficients.GetSize() - 1;
}
FX_BOOL CBC_PDF417ECModulusPoly::isZero()
{
return m_coefficients[0] == 0;
}
FX_INT32 CBC_PDF417ECModulusPoly::getCoefficient(FX_INT32 degree)
{
return m_coefficients[m_coefficients.GetSize() - 1 - degree];
}
FX_INT32 CBC_PDF417ECModulusPoly::evaluateAt(FX_INT32 a)
{
if (a == 0) {
return getCoefficient(0);
}
FX_INT32 size = m_coefficients.GetSize();
if (a == 1) {
FX_INT32 result = 0;
for (FX_INT32 l = 0; l < m_coefficients.GetSize(); l++) {
FX_INT32 coefficient = m_coefficients.GetAt(l);
result = m_field->add(result, coefficient);
}
return result;
}
FX_INT32 result = m_coefficients[0];
for (FX_INT32 i = 1; i < size; i++) {
result = m_field->add(m_field->multiply(a, result), m_coefficients[i]);
}
return result;
}
CBC_PDF417ECModulusPoly* CBC_PDF417ECModulusPoly::add(CBC_PDF417ECModulusPoly* other, FX_INT32 &e)
{
CBC_PDF417ECModulusPoly* modulusPoly = NULL;
if (isZero()) {
modulusPoly = FX_NEW CBC_PDF417ECModulusPoly(other->getField(), other->getCoefficients(), e);
BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
return modulusPoly;
}
if (other->isZero()) {
modulusPoly = FX_NEW CBC_PDF417ECModulusPoly(m_field, m_coefficients, e);
BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
return modulusPoly;
}
CFX_Int32Array smallerCoefficients;
smallerCoefficients.Copy(m_coefficients);
CFX_Int32Array largerCoefficients;
largerCoefficients.Copy(other->m_coefficients);
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 l = 0; l < lengthDiff; l++) {
sumDiff.SetAt(l, largerCoefficients.GetAt(l));
}
for (FX_INT32 i = lengthDiff; i < largerCoefficients.GetSize(); i++) {
sumDiff[i] = m_field->add(smallerCoefficients[i - lengthDiff], largerCoefficients[i]);
}
modulusPoly = FX_NEW CBC_PDF417ECModulusPoly(m_field, sumDiff, e);
BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
return modulusPoly;
}
CBC_PDF417ECModulusPoly* CBC_PDF417ECModulusPoly::subtract(CBC_PDF417ECModulusPoly* other, FX_INT32 &e)
{
CBC_PDF417ECModulusPoly* modulusPoly = NULL;
if (other->isZero()) {
modulusPoly = FX_NEW CBC_PDF417ECModulusPoly(m_field, m_coefficients, e);
BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
return modulusPoly;
}
CBC_PDF417ECModulusPoly* poly = other->negative(e);
BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
modulusPoly = add(poly, e);
delete poly;
BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
return modulusPoly;
}
CBC_PDF417ECModulusPoly* CBC_PDF417ECModulusPoly::multiply(CBC_PDF417ECModulusPoly* other, FX_INT32 &e)
{
CBC_PDF417ECModulusPoly* modulusPoly = NULL;
if (isZero() || other->isZero()) {
modulusPoly = FX_NEW CBC_PDF417ECModulusPoly(m_field->getZero()->getField(), m_field->getZero()->getCoefficients(), e);
BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
return modulusPoly;
}
CFX_Int32Array aCoefficients;
aCoefficients.Copy(m_coefficients);
FX_INT32 aLength = aCoefficients.GetSize();
CFX_Int32Array bCoefficients;
bCoefficients.Copy(other->m_coefficients);
FX_INT32 bLength = bCoefficients.GetSize();
CFX_Int32Array product;
product.SetSize(aLength + bLength - 1);
for (FX_INT32 i = 0; i < aLength; i++) {
FX_INT32 aCoeff = aCoefficients[i];
for (FX_INT32 j = 0; j < bLength; j++) {
product[i + j] = m_field->add(product[i + j], m_field->multiply(aCoeff, bCoefficients[j]));
}
}
modulusPoly = FX_NEW CBC_PDF417ECModulusPoly(m_field, product, e);
BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
return modulusPoly;
}
CBC_PDF417ECModulusPoly* CBC_PDF417ECModulusPoly::negative(FX_INT32 &e)
{
FX_INT32 size = m_coefficients.GetSize();
CFX_Int32Array negativeCoefficients;
negativeCoefficients.SetSize(size);
for (FX_INT32 i = 0; i < size; i++) {
negativeCoefficients[i] = m_field->subtract(0, m_coefficients[i]);
}
CBC_PDF417ECModulusPoly* modulusPoly = FX_NEW CBC_PDF417ECModulusPoly(m_field, negativeCoefficients, e);
BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
return modulusPoly;
}
CBC_PDF417ECModulusPoly* CBC_PDF417ECModulusPoly::multiply(FX_INT32 scalar, FX_INT32 &e)
{
CBC_PDF417ECModulusPoly* modulusPoly = NULL;
if (scalar == 0) {
modulusPoly = FX_NEW CBC_PDF417ECModulusPoly(m_field->getZero()->getField(), m_field->getZero()->getCoefficients(), e);
BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
return modulusPoly;
}
if (scalar == 1) {
modulusPoly = FX_NEW CBC_PDF417ECModulusPoly(m_field, m_coefficients, e);
BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
return modulusPoly;
}
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);
}
modulusPoly = FX_NEW CBC_PDF417ECModulusPoly(m_field, product, e);
BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
return modulusPoly;
}
CBC_PDF417ECModulusPoly* CBC_PDF417ECModulusPoly::multiplyByMonomial(FX_INT32 degree, FX_INT32 coefficient, FX_INT32 &e)
{
if (degree < 0) {
e = BCExceptionIllegalArgument;
return NULL;
}
CBC_PDF417ECModulusPoly* modulusPoly = NULL;
if (coefficient == 0) {
modulusPoly = FX_NEW CBC_PDF417ECModulusPoly(m_field->getZero()->m_field, m_field->getZero()->m_coefficients, e);
BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
return modulusPoly;
}
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);
}
modulusPoly = FX_NEW CBC_PDF417ECModulusPoly(m_field, product, e);
BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
return modulusPoly;
}
CFX_PtrArray* CBC_PDF417ECModulusPoly::divide(CBC_PDF417ECModulusPoly* other, FX_INT32 &e)
{
if (other->isZero()) {
e = BCExceptionDivideByZero;
return NULL;
}
CBC_PDF417ECModulusPoly* quotient = FX_NEW CBC_PDF417ECModulusPoly(m_field->getZero()->m_field, m_field->getZero()->m_coefficients, e);
BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
CBC_PDF417ECModulusPoly* remainder = FX_NEW CBC_PDF417ECModulusPoly(m_field, m_coefficients, e);
if (e != BCExceptionNO) {
delete quotient;
return NULL;
}
FX_INT32 denominatorLeadingTerm = other->getCoefficient(other->getDegree());
FX_INT32 inverseDenominatorLeadingTerm = m_field->inverse(denominatorLeadingTerm, e);
if (e != BCExceptionNO) {
delete quotient;
delete remainder;
return NULL;
}
while (remainder->getDegree() >= other->getDegree() && !remainder->isZero()) {
FX_INT32 degreeDifference = remainder->getDegree() - other->getDegree();
FX_INT32 scale = m_field->multiply(remainder->getCoefficient(remainder->getDegree()), inverseDenominatorLeadingTerm);
CBC_PDF417ECModulusPoly* term = other->multiplyByMonomial(degreeDifference, scale, e);
if (e != BCExceptionNO) {
delete quotient;
delete remainder;
return NULL;
}
CBC_PDF417ECModulusPoly* iterationQuotient = m_field->buildMonomial(degreeDifference, scale, e);
if (e != BCExceptionNO) {
delete quotient;
delete remainder;
delete term;
return NULL;
}
CBC_PDF417ECModulusPoly* temp = quotient;
quotient = temp->add(iterationQuotient, e);
delete iterationQuotient;
delete temp;
if (e != BCExceptionNO) {
delete remainder;
return NULL;
}
temp = remainder;
remainder = temp->subtract(term, e);
delete term;
delete temp;
if (e != BCExceptionNO) {
delete quotient;
return NULL;
}
}
CFX_PtrArray* modulusPoly = FX_NEW CFX_PtrArray;
modulusPoly->Add(quotient);
modulusPoly->Add(remainder);
return modulusPoly;
}
CFX_ByteString CBC_PDF417ECModulusPoly::toString()
{
CFX_ByteString result;
for (FX_INT32 degree = getDegree(); degree >= 0; degree--) {
FX_INT32 coefficient = getCoefficient(degree);
if (coefficient != 0) {
if (coefficient < 0) {
result += " - ";
coefficient = -coefficient;
} else {
if (result.GetLength() > 0) {
result += " + ";
}
}
if (degree == 0 || coefficient != 1) {
result += coefficient;
}
if (degree != 0) {
if (degree == 1) {
result += 'x';
} else {
result += "x^";
result += degree;
}
}
}
}
return result;
}