diff options
Diffstat (limited to 'xfa/src/fxbarcode/pdf417/BC_PDF417ECModulusPoly.cpp')
| -rw-r--r-- | xfa/src/fxbarcode/pdf417/BC_PDF417ECModulusPoly.cpp | 316 |
1 files changed, 316 insertions, 0 deletions
diff --git a/xfa/src/fxbarcode/pdf417/BC_PDF417ECModulusPoly.cpp b/xfa/src/fxbarcode/pdf417/BC_PDF417ECModulusPoly.cpp new file mode 100644 index 0000000000..39d3fd8056 --- /dev/null +++ b/xfa/src/fxbarcode/pdf417/BC_PDF417ECModulusPoly.cpp @@ -0,0 +1,316 @@ +// 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;
+}
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