diff options
Diffstat (limited to 'xfa/src/fxbarcode/pdf417/BC_PDF417ECErrorCorrection.cpp')
| -rw-r--r-- | xfa/src/fxbarcode/pdf417/BC_PDF417ECErrorCorrection.cpp | 369 |
1 files changed, 369 insertions, 0 deletions
diff --git a/xfa/src/fxbarcode/pdf417/BC_PDF417ECErrorCorrection.cpp b/xfa/src/fxbarcode/pdf417/BC_PDF417ECErrorCorrection.cpp new file mode 100644 index 0000000000..23207ef959 --- /dev/null +++ b/xfa/src/fxbarcode/pdf417/BC_PDF417ECErrorCorrection.cpp @@ -0,0 +1,369 @@ +// 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_PDF417ECModulusPoly.h"
+#include "BC_PDF417ECModulusGF.h"
+#include "BC_PDF417ECErrorCorrection.h"
+CBC_PDF417ECModulusGF* CBC_PDF417ECErrorCorrection::m_field = NULL;
+void CBC_PDF417ECErrorCorrection::Initialize(FX_INT32 &e)
+{
+ m_field = FX_NEW CBC_PDF417ECModulusGF(CBC_PDF417Common::NUMBER_OF_CODEWORDS, 3, e);
+}
+void CBC_PDF417ECErrorCorrection::Finalize()
+{
+ delete m_field;
+}
+CBC_PDF417ECErrorCorrection::CBC_PDF417ECErrorCorrection()
+{
+}
+CBC_PDF417ECErrorCorrection::~CBC_PDF417ECErrorCorrection()
+{
+}
+FX_INT32 CBC_PDF417ECErrorCorrection::decode(CFX_Int32Array &received, FX_INT32 numECCodewords, CFX_Int32Array &erasures, FX_INT32 &e)
+{
+ CBC_PDF417ECModulusPoly poly(m_field, received, e);
+ BC_EXCEPTION_CHECK_ReturnValue(e, -1);
+ CFX_Int32Array S;
+ S.SetSize(numECCodewords);
+ FX_BOOL error = FALSE;
+ for (FX_INT32 l = numECCodewords; l > 0; l--) {
+ FX_INT32 eval = poly.evaluateAt(m_field->exp(l));
+ S[numECCodewords - l] = eval;
+ if (eval != 0) {
+ error = TRUE;
+ }
+ }
+ if (!error) {
+ return 0;
+ }
+ CBC_PDF417ECModulusPoly* syndrome = FX_NEW CBC_PDF417ECModulusPoly(m_field, S, e);
+ BC_EXCEPTION_CHECK_ReturnValue(e, -1);
+ CBC_PDF417ECModulusPoly* buildmonomial = m_field->buildMonomial(numECCodewords, 1, e);
+ if (e != BCExceptionNO) {
+ delete syndrome;
+ return -1;
+ }
+ CFX_PtrArray* sigmaOmega = runEuclideanAlgorithm(buildmonomial, syndrome, numECCodewords, e);
+ delete buildmonomial;
+ delete syndrome;
+ BC_EXCEPTION_CHECK_ReturnValue(e, -1);
+ CBC_PDF417ECModulusPoly* sigma = (CBC_PDF417ECModulusPoly*)sigmaOmega->GetAt(0);
+ CBC_PDF417ECModulusPoly* omega = (CBC_PDF417ECModulusPoly*)sigmaOmega->GetAt(1);
+ CFX_Int32Array* errorLocations = findErrorLocations(sigma, e);
+ if (e != BCExceptionNO) {
+ for (FX_INT32 i = 0; i < sigmaOmega->GetSize(); i++) {
+ delete (CBC_PDF417ECModulusPoly*)sigmaOmega->GetAt(i);
+ }
+ sigmaOmega->RemoveAll();
+ delete sigmaOmega;
+ return -1;
+ }
+ CFX_Int32Array* errorMagnitudes = findErrorMagnitudes(omega, sigma, *errorLocations, e);
+ if (e != BCExceptionNO) {
+ delete errorLocations;
+ for (FX_INT32 i = 0; i < sigmaOmega->GetSize(); i++) {
+ delete (CBC_PDF417ECModulusPoly*)sigmaOmega->GetAt(i);
+ }
+ sigmaOmega->RemoveAll();
+ delete sigmaOmega;
+ return -1;
+ }
+ for (FX_INT32 i = 0; i < errorLocations->GetSize(); i++) {
+ FX_INT32 log = m_field->log(errorLocations->GetAt(i), e);;
+ BC_EXCEPTION_CHECK_ReturnValue(e, -1);
+ FX_INT32 position = received.GetSize() - 1 - log;
+ if (position < 0) {
+ e = BCExceptionChecksumException;
+ delete errorLocations;
+ delete errorMagnitudes;
+ for (FX_INT32 j = 0; j < sigmaOmega->GetSize(); j++) {
+ delete (CBC_PDF417ECModulusPoly*)sigmaOmega->GetAt(j);
+ }
+ sigmaOmega->RemoveAll();
+ delete sigmaOmega;
+ return -1;
+ }
+ received[position] = m_field->subtract(received[position], errorMagnitudes->GetAt(i));
+ }
+ FX_INT32 result = errorLocations->GetSize();
+ delete errorLocations;
+ delete errorMagnitudes;
+ for (FX_INT32 k = 0; k < sigmaOmega->GetSize(); k++) {
+ delete (CBC_PDF417ECModulusPoly*)sigmaOmega->GetAt(k);
+ }
+ sigmaOmega->RemoveAll();
+ delete sigmaOmega;
+ return result;
+}
+CFX_PtrArray* CBC_PDF417ECErrorCorrection::runEuclideanAlgorithm(CBC_PDF417ECModulusPoly* a, CBC_PDF417ECModulusPoly* b, FX_INT32 R, FX_INT32 &e)
+{
+ if (a->getDegree() < b->getDegree()) {
+ CBC_PDF417ECModulusPoly* temp = a;
+ a = b;
+ b = temp;
+ }
+ CBC_PDF417ECModulusPoly* rLast = a;
+ CBC_PDF417ECModulusPoly* r = b;
+ CBC_PDF417ECModulusPoly* tLast = m_field->getZero();
+ CBC_PDF417ECModulusPoly* t = m_field->getOne();
+ CBC_PDF417ECModulusPoly* qtemp = NULL;
+ CBC_PDF417ECModulusPoly* rtemp = NULL;
+ CBC_PDF417ECModulusPoly* ttemp = NULL;
+ FX_INT32 i = 0;
+ FX_INT32 j = 0;
+ FX_INT32 m = 0;
+ FX_INT32 n = 0;
+ while (r->getDegree() >= R / 2) {
+ CBC_PDF417ECModulusPoly* rLastLast = rLast;
+ CBC_PDF417ECModulusPoly* tLastLast = tLast;
+ rLast = r;
+ tLast = t;
+ m = i;
+ n = j;
+ if (rLast->isZero()) {
+ e = BCExceptionChecksumException;
+ if (qtemp) {
+ delete qtemp;
+ }
+ if (rtemp) {
+ delete rtemp;
+ }
+ if (ttemp) {
+ delete ttemp;
+ }
+ return NULL;
+ }
+ r = rLastLast;
+ CBC_PDF417ECModulusPoly* q = m_field->getZero();
+ FX_INT32 denominatorLeadingTerm = rLast->getCoefficient(rLast->getDegree());
+ FX_INT32 dltInverse = m_field->inverse(denominatorLeadingTerm, e);
+ if (e != BCExceptionNO) {
+ if (qtemp) {
+ delete qtemp;
+ }
+ if (rtemp) {
+ delete rtemp;
+ }
+ if (ttemp) {
+ delete ttemp;
+ }
+ return NULL;
+ }
+ while (r->getDegree() >= rLast->getDegree() && !r->isZero()) {
+ FX_INT32 degreeDiff = r->getDegree() - rLast->getDegree();
+ FX_INT32 scale = m_field->multiply(r->getCoefficient(r->getDegree()), dltInverse);
+ CBC_PDF417ECModulusPoly* buildmonomial = m_field->buildMonomial(degreeDiff, scale, e);
+ if (e != BCExceptionNO) {
+ if (qtemp) {
+ delete qtemp;
+ }
+ if (rtemp) {
+ delete rtemp;
+ }
+ if (ttemp) {
+ delete ttemp;
+ }
+ return NULL;
+ }
+ q = q->add(buildmonomial, e);
+ delete buildmonomial;
+ if (qtemp) {
+ delete qtemp;
+ }
+ if (e != BCExceptionNO) {
+ if (rtemp) {
+ delete rtemp;
+ }
+ if (ttemp) {
+ delete ttemp;
+ }
+ return NULL;
+ }
+ qtemp = q;
+ CBC_PDF417ECModulusPoly* multiply = rLast->multiplyByMonomial(degreeDiff, scale, e);
+ if (e != BCExceptionNO) {
+ if (qtemp) {
+ delete qtemp;
+ }
+ if (rtemp) {
+ delete rtemp;
+ }
+ if (ttemp) {
+ delete ttemp;
+ }
+ return NULL;
+ }
+ CBC_PDF417ECModulusPoly* temp = r;
+ r = temp->subtract(multiply, e);
+ delete multiply;
+ if (m > 1 && i > m) {
+ delete temp;
+ temp = NULL;
+ }
+ if (e != BCExceptionNO) {
+ if (qtemp) {
+ delete qtemp;
+ }
+ if (rtemp) {
+ delete rtemp;
+ }
+ if (ttemp) {
+ delete ttemp;
+ }
+ return NULL;
+ }
+ rtemp = r;
+ i = m + 1;
+ }
+ ttemp = q->multiply(tLast, e);
+ if (qtemp) {
+ delete qtemp;
+ qtemp = NULL;
+ }
+ if (e != BCExceptionNO) {
+ if (rtemp) {
+ delete rtemp;
+ }
+ if (ttemp) {
+ delete ttemp;
+ }
+ return NULL;
+ }
+ t = ttemp->subtract(tLastLast, e);
+ if (n > 1 && j > n) {
+ delete tLastLast;
+ }
+ delete ttemp;
+ if (e != BCExceptionNO) {
+ if (rtemp) {
+ delete rtemp;
+ }
+ return NULL;
+ }
+ ttemp = t;
+ t = ttemp->negative(e);
+ delete ttemp;
+ if (e != BCExceptionNO) {
+ if (rtemp) {
+ delete rtemp;
+ }
+ return NULL;
+ }
+ ttemp = t;
+ j++;
+ }
+ FX_INT32 aa = t->getCoefficient(1);
+ FX_INT32 sigmaTildeAtZero = t->getCoefficient(0);
+ if (sigmaTildeAtZero == 0) {
+ e = BCExceptionChecksumException;
+ if (rtemp) {
+ delete rtemp;
+ }
+ if (ttemp) {
+ delete ttemp;
+ }
+ return NULL;
+ }
+ FX_INT32 inverse = m_field->inverse(sigmaTildeAtZero, e);
+ if (e != BCExceptionNO) {
+ if (rtemp) {
+ delete rtemp;
+ }
+ if (ttemp) {
+ delete ttemp;
+ }
+ return NULL;
+ }
+ CBC_PDF417ECModulusPoly* sigma = t->multiply(inverse, e);
+ if (ttemp) {
+ delete ttemp;
+ }
+ if (e != BCExceptionNO) {
+ if (rtemp) {
+ delete rtemp;
+ }
+ return NULL;
+ }
+ CBC_PDF417ECModulusPoly* omega = r->multiply(inverse, e);
+ if (rtemp) {
+ delete rtemp;
+ }
+ BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
+ CFX_PtrArray* modulusPoly = FX_NEW CFX_PtrArray;
+ modulusPoly->Add(sigma);
+ modulusPoly->Add(omega);
+ return modulusPoly;
+}
+CFX_Int32Array* CBC_PDF417ECErrorCorrection::findErrorLocations(CBC_PDF417ECModulusPoly* errorLocator, FX_INT32 &e)
+{
+ FX_INT32 numErrors = errorLocator->getDegree();
+ CFX_Int32Array* result = FX_NEW CFX_Int32Array;
+ result->SetSize(numErrors);
+ FX_INT32 ee = 0;
+ for (FX_INT32 i = 1; i < m_field->getSize() && ee < numErrors; i++) {
+ if (errorLocator->evaluateAt(i) == 0) {
+ result->SetAt(ee, m_field->inverse(i, e));
+ if (e != BCExceptionNO) {
+ delete result;
+ return NULL;
+ }
+ ee++;
+ }
+ }
+ if (ee != numErrors) {
+ e = BCExceptionChecksumException;
+ delete result;
+ return NULL;
+ }
+ return result;
+}
+CFX_Int32Array* CBC_PDF417ECErrorCorrection::findErrorMagnitudes(CBC_PDF417ECModulusPoly* errorEvaluator, CBC_PDF417ECModulusPoly* errorLocator, CFX_Int32Array &errorLocations, FX_INT32 &e)
+{
+ FX_INT32 errorLocatorDegree = errorLocator->getDegree();
+ CFX_Int32Array formalDerivativeCoefficients;
+ formalDerivativeCoefficients.SetSize(errorLocatorDegree);
+ for (FX_INT32 l = 1; l <= errorLocatorDegree; l++) {
+ formalDerivativeCoefficients[errorLocatorDegree - l] = m_field->multiply(l, errorLocator->getCoefficient(l));
+ }
+ CBC_PDF417ECModulusPoly formalDerivative(m_field, formalDerivativeCoefficients, e);
+ BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
+ FX_INT32 s = errorLocations.GetSize();
+ CFX_Int32Array* result = FX_NEW CFX_Int32Array;
+ result->SetSize(s);
+ for (FX_INT32 i = 0; i < s; i++) {
+ FX_INT32 xiInverse = m_field->inverse(errorLocations[i], e);
+ if (e != BCExceptionNO) {
+ delete result;
+ return NULL;
+ }
+ FX_INT32 numerator = m_field->subtract(0, errorEvaluator->evaluateAt(xiInverse));
+ FX_INT32 denominator = m_field->inverse(formalDerivative.evaluateAt(xiInverse), e);
+ if (e != BCExceptionNO) {
+ delete result;
+ return NULL;
+ }
+ result->SetAt(i, m_field->multiply(numerator, denominator));
+ }
+ return result;
+}
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