| // 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 "xfa/src/fxbarcode/pdf417/BC_PDF417Common.h" |
| #include "xfa/src/fxbarcode/pdf417/BC_PDF417ECModulusGF.h" |
| #include "xfa/src/fxbarcode/pdf417/BC_PDF417ECModulusPoly.h" |
| #include "xfa/src/fxbarcode/utils.h" |
| |
| CBC_PDF417ECModulusPoly::CBC_PDF417ECModulusPoly(CBC_PDF417ECModulusGF* field, |
| CFX_Int32Array& coefficients, |
| int32_t& e) { |
| if (coefficients.GetSize() == 0) { |
| e = BCExceptionIllegalArgument; |
| } |
| 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 = field->getZero()->m_coefficients; |
| } else { |
| m_coefficients.SetSize(coefficientsLength - firstNonZero); |
| int32_t l = 0; |
| for (int32_t 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; |
| } |
| int32_t CBC_PDF417ECModulusPoly::getDegree() { |
| return m_coefficients.GetSize() - 1; |
| } |
| FX_BOOL CBC_PDF417ECModulusPoly::isZero() { |
| return m_coefficients[0] == 0; |
| } |
| int32_t CBC_PDF417ECModulusPoly::getCoefficient(int32_t degree) { |
| return m_coefficients[m_coefficients.GetSize() - 1 - degree]; |
| } |
| int32_t CBC_PDF417ECModulusPoly::evaluateAt(int32_t a) { |
| if (a == 0) { |
| return getCoefficient(0); |
| } |
| int32_t size = m_coefficients.GetSize(); |
| if (a == 1) { |
| int32_t result = 0; |
| for (int32_t l = 0; l < m_coefficients.GetSize(); l++) { |
| int32_t coefficient = m_coefficients.GetAt(l); |
| result = m_field->add(result, coefficient); |
| } |
| return result; |
| } |
| int32_t result = m_coefficients[0]; |
| for (int32_t 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, |
| int32_t& e) { |
| CBC_PDF417ECModulusPoly* modulusPoly = NULL; |
| if (isZero()) { |
| modulusPoly = new CBC_PDF417ECModulusPoly(other->getField(), |
| other->getCoefficients(), e); |
| BC_EXCEPTION_CHECK_ReturnValue(e, NULL); |
| return modulusPoly; |
| } |
| if (other->isZero()) { |
| modulusPoly = 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()); |
| int32_t lengthDiff = |
| largerCoefficients.GetSize() - smallerCoefficients.GetSize(); |
| for (int32_t l = 0; l < lengthDiff; l++) { |
| sumDiff.SetAt(l, largerCoefficients.GetAt(l)); |
| } |
| for (int32_t i = lengthDiff; i < largerCoefficients.GetSize(); i++) { |
| sumDiff[i] = m_field->add(smallerCoefficients[i - lengthDiff], |
| largerCoefficients[i]); |
| } |
| modulusPoly = new CBC_PDF417ECModulusPoly(m_field, sumDiff, e); |
| BC_EXCEPTION_CHECK_ReturnValue(e, NULL); |
| return modulusPoly; |
| } |
| CBC_PDF417ECModulusPoly* CBC_PDF417ECModulusPoly::subtract( |
| CBC_PDF417ECModulusPoly* other, |
| int32_t& e) { |
| CBC_PDF417ECModulusPoly* modulusPoly = NULL; |
| if (other->isZero()) { |
| modulusPoly = 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, |
| int32_t& e) { |
| CBC_PDF417ECModulusPoly* modulusPoly = NULL; |
| if (isZero() || other->isZero()) { |
| modulusPoly = |
| 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); |
| int32_t aLength = aCoefficients.GetSize(); |
| CFX_Int32Array bCoefficients; |
| bCoefficients.Copy(other->m_coefficients); |
| int32_t bLength = bCoefficients.GetSize(); |
| CFX_Int32Array product; |
| product.SetSize(aLength + bLength - 1); |
| for (int32_t i = 0; i < aLength; i++) { |
| int32_t aCoeff = aCoefficients[i]; |
| for (int32_t j = 0; j < bLength; j++) { |
| product[i + j] = m_field->add( |
| product[i + j], m_field->multiply(aCoeff, bCoefficients[j])); |
| } |
| } |
| modulusPoly = new CBC_PDF417ECModulusPoly(m_field, product, e); |
| BC_EXCEPTION_CHECK_ReturnValue(e, NULL); |
| return modulusPoly; |
| } |
| CBC_PDF417ECModulusPoly* CBC_PDF417ECModulusPoly::negative(int32_t& e) { |
| int32_t size = m_coefficients.GetSize(); |
| CFX_Int32Array negativeCoefficients; |
| negativeCoefficients.SetSize(size); |
| for (int32_t i = 0; i < size; i++) { |
| negativeCoefficients[i] = m_field->subtract(0, m_coefficients[i]); |
| } |
| CBC_PDF417ECModulusPoly* modulusPoly = |
| new CBC_PDF417ECModulusPoly(m_field, negativeCoefficients, e); |
| BC_EXCEPTION_CHECK_ReturnValue(e, NULL); |
| return modulusPoly; |
| } |
| CBC_PDF417ECModulusPoly* CBC_PDF417ECModulusPoly::multiply(int32_t scalar, |
| int32_t& e) { |
| CBC_PDF417ECModulusPoly* modulusPoly = NULL; |
| if (scalar == 0) { |
| modulusPoly = |
| new CBC_PDF417ECModulusPoly(m_field->getZero()->getField(), |
| m_field->getZero()->getCoefficients(), e); |
| BC_EXCEPTION_CHECK_ReturnValue(e, NULL); |
| return modulusPoly; |
| } |
| if (scalar == 1) { |
| modulusPoly = new CBC_PDF417ECModulusPoly(m_field, m_coefficients, e); |
| BC_EXCEPTION_CHECK_ReturnValue(e, NULL); |
| return modulusPoly; |
| } |
| 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); |
| } |
| modulusPoly = new CBC_PDF417ECModulusPoly(m_field, product, e); |
| BC_EXCEPTION_CHECK_ReturnValue(e, NULL); |
| return modulusPoly; |
| } |
| CBC_PDF417ECModulusPoly* CBC_PDF417ECModulusPoly::multiplyByMonomial( |
| int32_t degree, |
| int32_t coefficient, |
| int32_t& e) { |
| if (degree < 0) { |
| e = BCExceptionIllegalArgument; |
| return NULL; |
| } |
| CBC_PDF417ECModulusPoly* modulusPoly = NULL; |
| if (coefficient == 0) { |
| modulusPoly = new CBC_PDF417ECModulusPoly( |
| m_field->getZero()->m_field, m_field->getZero()->m_coefficients, e); |
| BC_EXCEPTION_CHECK_ReturnValue(e, NULL); |
| return modulusPoly; |
| } |
| 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); |
| } |
| modulusPoly = new CBC_PDF417ECModulusPoly(m_field, product, e); |
| BC_EXCEPTION_CHECK_ReturnValue(e, NULL); |
| return modulusPoly; |
| } |
| CFX_PtrArray* CBC_PDF417ECModulusPoly::divide(CBC_PDF417ECModulusPoly* other, |
| int32_t& e) { |
| if (other->isZero()) { |
| e = BCExceptionDivideByZero; |
| return NULL; |
| } |
| CBC_PDF417ECModulusPoly* quotient = new CBC_PDF417ECModulusPoly( |
| m_field->getZero()->m_field, m_field->getZero()->m_coefficients, e); |
| BC_EXCEPTION_CHECK_ReturnValue(e, NULL); |
| CBC_PDF417ECModulusPoly* remainder = |
| new CBC_PDF417ECModulusPoly(m_field, m_coefficients, e); |
| if (e != BCExceptionNO) { |
| delete quotient; |
| return NULL; |
| } |
| int32_t denominatorLeadingTerm = other->getCoefficient(other->getDegree()); |
| int32_t inverseDenominatorLeadingTerm = |
| m_field->inverse(denominatorLeadingTerm, e); |
| if (e != BCExceptionNO) { |
| delete quotient; |
| delete remainder; |
| return NULL; |
| } |
| while (remainder->getDegree() >= other->getDegree() && !remainder->isZero()) { |
| int32_t degreeDifference = remainder->getDegree() - other->getDegree(); |
| int32_t 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 = new CFX_PtrArray; |
| modulusPoly->Add(quotient); |
| modulusPoly->Add(remainder); |
| return modulusPoly; |
| } |
| CFX_ByteString CBC_PDF417ECModulusPoly::toString() { |
| CFX_ByteString result; |
| for (int32_t degree = getDegree(); degree >= 0; degree--) { |
| int32_t 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; |
| } |