// Copyright 2014 PDFium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
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// Original code is licensed as follows:
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/*
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* Copyright 2007 ZXing authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "xfa/fxbarcode/common/reedsolomon/BC_ReedSolomon.h"
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#include <memory>
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#include "xfa/fxbarcode/common/reedsolomon/BC_ReedSolomonGF256.h"
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#include "xfa/fxbarcode/common/reedsolomon/BC_ReedSolomonGF256Poly.h"
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CBC_ReedSolomonEncoder::CBC_ReedSolomonEncoder(CBC_ReedSolomonGF256* field) {
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m_field = field;
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}
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void CBC_ReedSolomonEncoder::Init() {
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m_cachedGenerators.Add(new CBC_ReedSolomonGF256Poly(m_field, 1));
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}
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CBC_ReedSolomonGF256Poly* CBC_ReedSolomonEncoder::BuildGenerator(int32_t degree,
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int32_t& e) {
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if (degree >= m_cachedGenerators.GetSize()) {
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CBC_ReedSolomonGF256Poly* lastGenerator =
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m_cachedGenerators[m_cachedGenerators.GetSize() - 1];
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for (int32_t d = m_cachedGenerators.GetSize(); d <= degree; d++) {
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CFX_Int32Array temp;
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temp.Add(1);
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temp.Add(m_field->Exp(d - 1));
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CBC_ReedSolomonGF256Poly temp_poly;
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temp_poly.Init(m_field, &temp, e);
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BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
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CBC_ReedSolomonGF256Poly* nextGenerator =
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lastGenerator->Multiply(&temp_poly, e);
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BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
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m_cachedGenerators.Add(nextGenerator);
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lastGenerator = nextGenerator;
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}
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}
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return m_cachedGenerators[degree];
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}
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void CBC_ReedSolomonEncoder::Encode(CFX_Int32Array* toEncode,
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int32_t ecBytes,
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int32_t& e) {
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if (ecBytes == 0) {
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e = BCExceptionNoCorrectionBytes;
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BC_EXCEPTION_CHECK_ReturnVoid(e);
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}
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int32_t dataBytes = toEncode->GetSize() - ecBytes;
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if (dataBytes <= 0) {
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e = BCExceptionNoDataBytesProvided;
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BC_EXCEPTION_CHECK_ReturnVoid(e);
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}
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CBC_ReedSolomonGF256Poly* generator = BuildGenerator(ecBytes, e);
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BC_EXCEPTION_CHECK_ReturnVoid(e);
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CFX_Int32Array infoCoefficients;
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infoCoefficients.SetSize(dataBytes);
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for (int32_t x = 0; x < dataBytes; x++) {
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infoCoefficients[x] = toEncode->operator[](x);
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}
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CBC_ReedSolomonGF256Poly info;
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info.Init(m_field, &infoCoefficients, e);
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BC_EXCEPTION_CHECK_ReturnVoid(e);
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std::unique_ptr<CBC_ReedSolomonGF256Poly> infoTemp(
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info.MultiplyByMonomial(ecBytes, 1, e));
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BC_EXCEPTION_CHECK_ReturnVoid(e);
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std::unique_ptr<CFX_ArrayTemplate<CBC_ReedSolomonGF256Poly*>> temp(
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infoTemp->Divide(generator, e));
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BC_EXCEPTION_CHECK_ReturnVoid(e);
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CBC_ReedSolomonGF256Poly* remainder = (*temp)[1];
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CFX_Int32Array* coefficients = remainder->GetCoefficients();
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int32_t numZeroCoefficients = ecBytes - coefficients->GetSize();
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for (int32_t i = 0; i < numZeroCoefficients; i++) {
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(*toEncode)[dataBytes + i] = 0;
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}
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for (int32_t y = 0; y < coefficients->GetSize(); y++) {
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(*toEncode)[dataBytes + numZeroCoefficients + y] =
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coefficients->operator[](y);
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}
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for (int32_t k = 0; k < temp->GetSize(); k++) {
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delete (*temp)[k];
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}
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}
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CBC_ReedSolomonEncoder::~CBC_ReedSolomonEncoder() {
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for (int32_t i = 0; i < m_cachedGenerators.GetSize(); i++)
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delete m_cachedGenerators[i];
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}
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