diff options
Diffstat (limited to 'xfa/fxbarcode/pdf417/BC_PDF417ECModulusPoly.cpp')
| -rw-r--r-- | xfa/fxbarcode/pdf417/BC_PDF417ECModulusPoly.cpp | 332 |
1 files changed, 332 insertions, 0 deletions
diff --git a/xfa/fxbarcode/pdf417/BC_PDF417ECModulusPoly.cpp b/xfa/fxbarcode/pdf417/BC_PDF417ECModulusPoly.cpp new file mode 100644 index 0000000000..d0bbe5ab0a --- /dev/null +++ b/xfa/fxbarcode/pdf417/BC_PDF417ECModulusPoly.cpp @@ -0,0 +1,332 @@ +// 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/fxbarcode/pdf417/BC_PDF417Common.h" +#include "xfa/fxbarcode/pdf417/BC_PDF417ECModulusGF.h" +#include "xfa/fxbarcode/pdf417/BC_PDF417ECModulusPoly.h" +#include "xfa/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; +} |