diff options
Diffstat (limited to 'xfa/fxbarcode/common/reedsolomon/BC_ReedSolomonDecoder.cpp')
| -rw-r--r-- | xfa/fxbarcode/common/reedsolomon/BC_ReedSolomonDecoder.cpp | 221 |
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(); -} |