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Diffstat (limited to 'xfa/fxbarcode/common/reedsolomon/BC_ReedSolomonDecoder.cpp')
-rw-r--r--xfa/fxbarcode/common/reedsolomon/BC_ReedSolomonDecoder.cpp221
1 files changed, 0 insertions, 221 deletions
diff --git a/xfa/fxbarcode/common/reedsolomon/BC_ReedSolomonDecoder.cpp b/xfa/fxbarcode/common/reedsolomon/BC_ReedSolomonDecoder.cpp
deleted file mode 100644
index 8788afbda8..0000000000
--- a/xfa/fxbarcode/common/reedsolomon/BC_ReedSolomonDecoder.cpp
+++ /dev/null
@@ -1,221 +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 "xfa/fxbarcode/common/reedsolomon/BC_ReedSolomonDecoder.h"
-
-#include <memory>
-#include <utility>
-
-#include "xfa/fxbarcode/common/reedsolomon/BC_ReedSolomonGF256.h"
-#include "xfa/fxbarcode/common/reedsolomon/BC_ReedSolomonGF256Poly.h"
-
-CBC_ReedSolomonDecoder::CBC_ReedSolomonDecoder(CBC_ReedSolomonGF256* field) {
- m_field = field;
-}
-CBC_ReedSolomonDecoder::~CBC_ReedSolomonDecoder() {}
-void CBC_ReedSolomonDecoder::Decode(CFX_Int32Array* received,
- int32_t twoS,
- int32_t& 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 (int32_t i = 0; i < twoS; i++) {
- int32_t 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);
- std::unique_ptr<CBC_ReedSolomonGF256Poly> temp(
- m_field->BuildMonomial(twoS, 1, e));
- BC_EXCEPTION_CHECK_ReturnVoid(e);
- std::unique_ptr<CFX_ArrayTemplate<CBC_ReedSolomonGF256Poly*>> sigmaOmega(
- RunEuclideanAlgorithm(temp.get(), &syndrome, twoS, e));
- BC_EXCEPTION_CHECK_ReturnVoid(e);
- std::unique_ptr<CBC_ReedSolomonGF256Poly> sigma((*sigmaOmega)[0]);
- std::unique_ptr<CBC_ReedSolomonGF256Poly> omega((*sigmaOmega)[1]);
- std::unique_ptr<CFX_Int32Array> errorLocations(
- FindErrorLocations(sigma.get(), e));
- BC_EXCEPTION_CHECK_ReturnVoid(e);
- std::unique_ptr<CFX_Int32Array> errorMagnitudes(
- FindErrorMagnitudes(omega.get(), errorLocations.get(), dataMatrix, e));
- BC_EXCEPTION_CHECK_ReturnVoid(e);
- for (int32_t k = 0; k < errorLocations->GetSize(); k++) {
- int32_t 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_ArrayTemplate<CBC_ReedSolomonGF256Poly*>*
-CBC_ReedSolomonDecoder::RunEuclideanAlgorithm(CBC_ReedSolomonGF256Poly* a,
- CBC_ReedSolomonGF256Poly* b,
- int32_t R,
- int32_t& e) {
- if (a->GetDegree() < b->GetDegree()) {
- CBC_ReedSolomonGF256Poly* temp = a;
- a = b;
- b = temp;
- }
- std::unique_ptr<CBC_ReedSolomonGF256Poly> rLast(a->Clone(e));
- BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
- std::unique_ptr<CBC_ReedSolomonGF256Poly> r(b->Clone(e));
- BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
- std::unique_ptr<CBC_ReedSolomonGF256Poly> sLast(m_field->GetOne()->Clone(e));
- BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
- std::unique_ptr<CBC_ReedSolomonGF256Poly> s(m_field->GetZero()->Clone(e));
- BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
- std::unique_ptr<CBC_ReedSolomonGF256Poly> tLast(m_field->GetZero()->Clone(e));
- BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
- std::unique_ptr<CBC_ReedSolomonGF256Poly> t(m_field->GetOne()->Clone(e));
- BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
- while (r->GetDegree() >= R / 2) {
- std::unique_ptr<CBC_ReedSolomonGF256Poly> rLastLast = std::move(rLast);
- std::unique_ptr<CBC_ReedSolomonGF256Poly> sLastLast = std::move(sLast);
- std::unique_ptr<CBC_ReedSolomonGF256Poly> tLastlast = std::move(tLast);
- rLast = std::move(r);
- sLast = std::move(s);
- tLast = std::move(t);
- if (rLast->IsZero()) {
- e = BCExceptionR_I_1IsZero;
- BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
- }
- r.reset(rLastLast->Clone(e));
- BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
- std::unique_ptr<CBC_ReedSolomonGF256Poly> q(m_field->GetZero()->Clone(e));
- BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
- int32_t denominatorLeadingTerm = rLast->GetCoefficients(rLast->GetDegree());
- int32_t dltInverse = m_field->Inverse(denominatorLeadingTerm, e);
- BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
- while (r->GetDegree() >= rLast->GetDegree() && !(r->IsZero())) {
- int32_t degreeDiff = r->GetDegree() - rLast->GetDegree();
- int32_t scale =
- m_field->Multiply(r->GetCoefficients(r->GetDegree()), dltInverse);
- std::unique_ptr<CBC_ReedSolomonGF256Poly> build(
- m_field->BuildMonomial(degreeDiff, scale, e));
- BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
- q.reset(q->AddOrSubtract(build.get(), e));
- BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
- std::unique_ptr<CBC_ReedSolomonGF256Poly> multiply(
- rLast->MultiplyByMonomial(degreeDiff, scale, e));
- BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
- r.reset(r->AddOrSubtract(multiply.get(), e));
- BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
- }
- std::unique_ptr<CBC_ReedSolomonGF256Poly> temp1(
- q->Multiply(sLast.get(), e));
- BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
- s.reset(temp1->AddOrSubtract(sLastLast.get(), e));
- BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
- std::unique_ptr<CBC_ReedSolomonGF256Poly> temp5(
- q->Multiply(tLast.get(), e));
- BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
- t.reset(temp5->AddOrSubtract(tLastlast.get(), e));
- BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
- }
- int32_t sigmaTildeAtZero = t->GetCoefficients(0);
- if (sigmaTildeAtZero == 0) {
- e = BCExceptionIsZero;
- BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
- }
- int32_t inverse = m_field->Inverse(sigmaTildeAtZero, e);
- BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
- std::unique_ptr<CBC_ReedSolomonGF256Poly> sigma(t->Multiply(inverse, e));
- BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
- std::unique_ptr<CBC_ReedSolomonGF256Poly> omega(r->Multiply(inverse, e));
- BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
- CFX_ArrayTemplate<CBC_ReedSolomonGF256Poly*>* temp =
- new CFX_ArrayTemplate<CBC_ReedSolomonGF256Poly*>();
- temp->Add(sigma.release());
- temp->Add(omega.release());
- return temp;
-}
-CFX_Int32Array* CBC_ReedSolomonDecoder::FindErrorLocations(
- CBC_ReedSolomonGF256Poly* errorLocator,
- int32_t& e) {
- int32_t numErrors = errorLocator->GetDegree();
- if (numErrors == 1) {
- std::unique_ptr<CFX_Int32Array> temp(new CFX_Int32Array);
- temp->Add(errorLocator->GetCoefficients(1));
- return temp.release();
- }
- CFX_Int32Array* tempT = new CFX_Int32Array;
- tempT->SetSize(numErrors);
- std::unique_ptr<CFX_Int32Array> result(tempT);
- int32_t ie = 0;
- for (int32_t i = 1; i < 256 && ie < numErrors; i++) {
- if (errorLocator->EvaluateAt(i) == 0) {
- (*result)[ie] = m_field->Inverse(i, ie);
- BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
- ie++;
- }
- }
- if (ie != numErrors) {
- e = BCExceptionDegreeNotMatchRoots;
- BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
- }
- return result.release();
-}
-CFX_Int32Array* CBC_ReedSolomonDecoder::FindErrorMagnitudes(
- CBC_ReedSolomonGF256Poly* errorEvaluator,
- CFX_Int32Array* errorLocations,
- FX_BOOL dataMatrix,
- int32_t& e) {
- int32_t s = errorLocations->GetSize();
- CFX_Int32Array* tempArray = new CFX_Int32Array;
- tempArray->SetSize(s);
- std::unique_ptr<CFX_Int32Array> result(tempArray);
- for (int32_t i = 0; i < s; i++) {
- int32_t xiInverse = m_field->Inverse(errorLocations->operator[](i), e);
- BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
- int32_t denominator = 1;
- for (int32_t j = 0; j < s; j++) {
- if (i != j) {
- denominator = m_field->Multiply(
- denominator, CBC_ReedSolomonGF256::AddOrSubtract(
- 1, m_field->Multiply(errorLocations->operator[](j),
- xiInverse)));
- }
- }
- int32_t temp = m_field->Inverse(denominator, e);
- BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
- (*result)[i] =
- m_field->Multiply(errorEvaluator->EvaluateAt(xiInverse), temp);
- }
- return result.release();
-}
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