// 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; | |
} |