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Unified Diff: xfa/src/fxbarcode/src/BC_ReedSolomonDecoder.cpp

Issue 842043002: Organize barcode codes into modules. (Closed) Base URL: https://pdfium.googlesource.com/pdfium.git@xfa
Patch Set: rebase Created 5 years, 11 months ago
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Index: xfa/src/fxbarcode/src/BC_ReedSolomonDecoder.cpp
diff --git a/xfa/src/fxbarcode/src/BC_ReedSolomonDecoder.cpp b/xfa/src/fxbarcode/src/BC_ReedSolomonDecoder.cpp
deleted file mode 100644
index da6161608712ffd34833f50a749127bcaf5cd0f7..0000000000000000000000000000000000000000
--- a/xfa/src/fxbarcode/src/BC_ReedSolomonDecoder.cpp
+++ /dev/null
@@ -1,224 +0,0 @@
-// 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 2007 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 "include/BC_ReedSolomonGF256.h"
-#include "include/BC_ReedSolomonGF256Poly.h"
-#include "include/BC_ReedSolomonDecoder.h"
-CBC_ReedSolomonDecoder::CBC_ReedSolomonDecoder(CBC_ReedSolomonGF256* field)
-{
- m_field = field;
-}
-CBC_ReedSolomonDecoder::~CBC_ReedSolomonDecoder()
-{
-}
-void CBC_ReedSolomonDecoder::Decode(CFX_Int32Array* received, FX_INT32 twoS, FX_INT32 &e)
-{
- CBC_ReedSolomonGF256Poly poly;
- poly.Init(m_field, received, e);
- BC_EXCEPTION_CHECK_ReturnVoid(e);
- CFX_Int32Array syndromeCoefficients;
- syndromeCoefficients.SetSize(twoS);
- FX_BOOL dataMatrix = FALSE;
- FX_BOOL noError = TRUE;
- for (FX_INT32 i = 0; i < twoS; i++) {
- FX_INT32 eval = poly.EvaluateAt(m_field->Exp(dataMatrix ? i + 1 : i));
- syndromeCoefficients[twoS - 1 - i] = eval;
- if (eval != 0) {
- noError = FALSE;
- }
- }
- if(noError) {
- return;
- }
- CBC_ReedSolomonGF256Poly syndrome;
- syndrome.Init(m_field, &syndromeCoefficients, e);
- BC_EXCEPTION_CHECK_ReturnVoid(e);
- CBC_ReedSolomonGF256Poly* rsg = m_field->BuildMonomial(twoS, 1, e);
- BC_EXCEPTION_CHECK_ReturnVoid(e);
- CBC_AutoPtr<CBC_ReedSolomonGF256Poly> temp(rsg);
- CFX_PtrArray* pa = RunEuclideanAlgorithm(temp.get(), &syndrome, twoS, e);
- BC_EXCEPTION_CHECK_ReturnVoid(e);
- CBC_AutoPtr<CFX_PtrArray > sigmaOmega(pa);
- CBC_AutoPtr<CBC_ReedSolomonGF256Poly> sigma((CBC_ReedSolomonGF256Poly*)(*sigmaOmega)[0]);
- CBC_AutoPtr<CBC_ReedSolomonGF256Poly> omega((CBC_ReedSolomonGF256Poly*)(*sigmaOmega)[1]);
- CFX_Int32Array* ia1 = FindErrorLocations(sigma.get(), e);
- BC_EXCEPTION_CHECK_ReturnVoid(e);
- CBC_AutoPtr<CFX_Int32Array > errorLocations(ia1);
- CFX_Int32Array* ia2 = FindErrorMagnitudes(omega.get(), errorLocations.get(), dataMatrix, e);
- BC_EXCEPTION_CHECK_ReturnVoid(e);
- CBC_AutoPtr<CFX_Int32Array > errorMagnitudes(ia2);
- for (FX_INT32 k = 0; k < errorLocations->GetSize(); k++) {
- FX_INT32 position = received->GetSize() - 1 - m_field->Log((*errorLocations)[k], e);
- BC_EXCEPTION_CHECK_ReturnVoid(e);
- if(position < 0) {
- e = BCExceptionBadErrorLocation;
- BC_EXCEPTION_CHECK_ReturnVoid(e);
- }
- (*received)[position] = CBC_ReedSolomonGF256::AddOrSubtract((*received)[position], (*errorMagnitudes)[k]);
- }
-}
-CFX_PtrArray *CBC_ReedSolomonDecoder::RunEuclideanAlgorithm(CBC_ReedSolomonGF256Poly* a, CBC_ReedSolomonGF256Poly* b, FX_INT32 R, FX_INT32 &e)
-{
- if (a->GetDegree() < b->GetDegree()) {
- CBC_ReedSolomonGF256Poly* temp = a;
- a = b;
- b = temp;
- }
- CBC_ReedSolomonGF256Poly* rsg1 = a->Clone(e);
- BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
- CBC_AutoPtr<CBC_ReedSolomonGF256Poly> rLast(rsg1);
- CBC_ReedSolomonGF256Poly* rsg2 = b->Clone(e);
- BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
- CBC_AutoPtr<CBC_ReedSolomonGF256Poly> r(rsg2);
- CBC_ReedSolomonGF256Poly* rsg3 = m_field->GetOne()->Clone(e);
- BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
- CBC_AutoPtr<CBC_ReedSolomonGF256Poly> sLast(rsg3);
- CBC_ReedSolomonGF256Poly* rsg4 = m_field->GetZero()->Clone(e);
- BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
- CBC_AutoPtr<CBC_ReedSolomonGF256Poly> s(rsg4);
- CBC_ReedSolomonGF256Poly* rsg5 = m_field->GetZero()->Clone(e);
- BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
- CBC_AutoPtr<CBC_ReedSolomonGF256Poly> tLast(rsg5);
- CBC_ReedSolomonGF256Poly* rsg6 = m_field->GetOne()->Clone(e);
- BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
- CBC_AutoPtr<CBC_ReedSolomonGF256Poly> t(rsg6);
- while (r->GetDegree() >= R / 2) {
- CBC_AutoPtr<CBC_ReedSolomonGF256Poly> rLastLast = rLast;
- CBC_AutoPtr<CBC_ReedSolomonGF256Poly> sLastLast = sLast;
- CBC_AutoPtr<CBC_ReedSolomonGF256Poly> tLastlast = tLast;
- rLast = r;
- sLast = s;
- tLast = t;
- if (rLast->IsZero()) {
- e = BCExceptionR_I_1IsZero;
- BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
- }
- CBC_ReedSolomonGF256Poly* rsg7 = rLastLast->Clone(e);
- BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
- CBC_AutoPtr<CBC_ReedSolomonGF256Poly> rTemp(rsg7);
- r = rTemp;
- CBC_ReedSolomonGF256Poly* rsg8 = m_field->GetZero()->Clone(e);
- BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
- CBC_AutoPtr<CBC_ReedSolomonGF256Poly> q(rsg8);
- FX_INT32 denominatorLeadingTerm = rLast->GetCoefficients(rLast->GetDegree());
- FX_INT32 dltInverse = m_field->Inverse(denominatorLeadingTerm, e);
- BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
- while (r->GetDegree() >= rLast->GetDegree() && !(r->IsZero())) {
- FX_INT32 degreeDiff = r->GetDegree() - rLast->GetDegree();
- FX_INT32 scale = m_field->Multiply(r->GetCoefficients(r->GetDegree()), dltInverse);
- CBC_ReedSolomonGF256Poly* rsgp1 = m_field->BuildMonomial(degreeDiff, scale, e);
- BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
- CBC_AutoPtr<CBC_ReedSolomonGF256Poly> build(rsgp1);
- CBC_ReedSolomonGF256Poly* rsgp2 = q->AddOrSubtract(build.get(), e);
- BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
- CBC_AutoPtr<CBC_ReedSolomonGF256Poly> temp(rsgp2);
- q = temp;
- CBC_ReedSolomonGF256Poly* rsgp3 = rLast->MultiplyByMonomial(degreeDiff, scale, e);
- BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
- CBC_AutoPtr<CBC_ReedSolomonGF256Poly> multiply(rsgp3);
- CBC_ReedSolomonGF256Poly* rsgp4 = r->AddOrSubtract(multiply.get(), e);
- BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
- CBC_AutoPtr<CBC_ReedSolomonGF256Poly> temp3(rsgp4);
- r = temp3;
- }
- CBC_ReedSolomonGF256Poly* rsg9 = q->Multiply(sLast.get(), e);
- BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
- CBC_AutoPtr<CBC_ReedSolomonGF256Poly> temp1(rsg9);
- CBC_ReedSolomonGF256Poly* rsg10 = temp1->AddOrSubtract(sLastLast.get(), e);
- BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
- CBC_AutoPtr<CBC_ReedSolomonGF256Poly> temp2(rsg10);
- s = temp2;
- CBC_ReedSolomonGF256Poly* rsg11 = q->Multiply(tLast.get(), e);
- BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
- CBC_AutoPtr<CBC_ReedSolomonGF256Poly> temp5(rsg11);
- CBC_ReedSolomonGF256Poly* rsg12 = temp5->AddOrSubtract(tLastlast.get(), e);
- BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
- CBC_AutoPtr<CBC_ReedSolomonGF256Poly> temp6(rsg12);
- t = temp6;
- }
- FX_INT32 sigmaTildeAtZero = t->GetCoefficients(0);
- if (sigmaTildeAtZero == 0) {
- e = BCExceptionIsZero;
- BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
- }
- FX_INT32 inverse = m_field->Inverse(sigmaTildeAtZero, e);
- BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
- CBC_ReedSolomonGF256Poly* rsg13 = t->Multiply(inverse, e);
- BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
- CBC_AutoPtr<CBC_ReedSolomonGF256Poly> sigma(rsg13);
- CBC_ReedSolomonGF256Poly* rsg14 = r->Multiply(inverse, e);
- BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
- CBC_AutoPtr<CBC_ReedSolomonGF256Poly> omega(rsg14);
- CFX_PtrArray *temp = FX_NEW CFX_PtrArray;
- temp->Add(sigma.release());
- temp->Add(omega.release());
- return temp;
-}
-CFX_Int32Array *CBC_ReedSolomonDecoder::FindErrorLocations(CBC_ReedSolomonGF256Poly* errorLocator, FX_INT32 &e)
-{
- FX_INT32 numErrors = errorLocator->GetDegree();
- if (numErrors == 1) {
- CBC_AutoPtr<CFX_Int32Array > temp(FX_NEW CFX_Int32Array);
- temp->Add(errorLocator->GetCoefficients(1));
- return temp.release();
- }
- CFX_Int32Array *tempT = FX_NEW CFX_Int32Array;
- tempT->SetSize(numErrors);
- CBC_AutoPtr<CFX_Int32Array > result(tempT);
- FX_INT32 ie = 0;
- for (FX_INT32 i = 1; i < 256 && ie < numErrors; i++) {
- if(errorLocator->EvaluateAt(i) == 0) {
- (*result)[ie] = m_field->Inverse(i, ie);
- BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
- ie++;
- }
- }
- if (ie != numErrors) {
- e = BCExceptionDegreeNotMatchRoots;
- BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
- }
- return result.release();
-}
-CFX_Int32Array *CBC_ReedSolomonDecoder::FindErrorMagnitudes(CBC_ReedSolomonGF256Poly* errorEvaluator, CFX_Int32Array* errorLocations, FX_BOOL dataMatrix, FX_INT32 &e)
-{
- FX_INT32 s = errorLocations->GetSize();
- CFX_Int32Array * temp = FX_NEW CFX_Int32Array;
- temp->SetSize(s);
- CBC_AutoPtr<CFX_Int32Array > result(temp);
- for (FX_INT32 i = 0; i < s; i++) {
- FX_INT32 xiInverse = m_field->Inverse(errorLocations->operator [](i), e);
- BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
- FX_INT32 denominator = 1;
- for(FX_INT32 j = 0; j < s; j++) {
- if(i != j) {
- denominator = m_field->Multiply(denominator,
- CBC_ReedSolomonGF256::AddOrSubtract(1, m_field->Multiply(errorLocations->operator [](j), xiInverse)));
- }
- }
- FX_INT32 temp = m_field->Inverse(denominator, temp);
- BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
- (*result)[i] = m_field->Multiply(errorEvaluator->EvaluateAt(xiInverse),
- temp);
- }
- return result.release();
-}
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