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// 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 "fxbarcode/common/reedsolomon/BC_ReedSolomon.h"
#include <memory>
#include "fxbarcode/common/reedsolomon/BC_ReedSolomonGF256.h"
#include "fxbarcode/common/reedsolomon/BC_ReedSolomonGF256Poly.h"
CBC_ReedSolomonEncoder::CBC_ReedSolomonEncoder(CBC_ReedSolomonGF256* field) {
m_field = field;
}
void CBC_ReedSolomonEncoder::Init() {
m_cachedGenerators.push_back(new CBC_ReedSolomonGF256Poly(m_field, 1));
}
CBC_ReedSolomonGF256Poly* CBC_ReedSolomonEncoder::BuildGenerator(size_t degree,
int32_t& e) {
if (degree >= m_cachedGenerators.size()) {
CBC_ReedSolomonGF256Poly* lastGenerator = m_cachedGenerators.back();
for (size_t d = m_cachedGenerators.size(); d <= degree; ++d) {
std::vector<int32_t> temp = {1, m_field->Exp(d - 1)};
CBC_ReedSolomonGF256Poly temp_poly;
temp_poly.Init(m_field, &temp, e);
if (e != BCExceptionNO)
return nullptr;
CBC_ReedSolomonGF256Poly* nextGenerator =
lastGenerator->Multiply(&temp_poly, e);
if (e != BCExceptionNO)
return nullptr;
m_cachedGenerators.push_back(nextGenerator);
lastGenerator = nextGenerator;
}
}
return m_cachedGenerators[degree];
}
void CBC_ReedSolomonEncoder::Encode(std::vector<int32_t>* toEncode,
size_t ecBytes,
int32_t& e) {
if (ecBytes == 0) {
e = BCExceptionNoCorrectionBytes;
return;
}
if (toEncode->size() <= ecBytes) {
e = BCExceptionNoDataBytesProvided;
return;
}
CBC_ReedSolomonGF256Poly* generator = BuildGenerator(ecBytes, e);
if (e != BCExceptionNO)
return;
size_t dataBytes = toEncode->size() - ecBytes;
std::vector<int32_t> infoCoefficients(dataBytes);
for (size_t x = 0; x < dataBytes; x++) {
infoCoefficients[x] = (*toEncode)[x];
}
CBC_ReedSolomonGF256Poly info;
info.Init(m_field, &infoCoefficients, e);
if (e != BCExceptionNO)
return;
std::unique_ptr<CBC_ReedSolomonGF256Poly> infoTemp(
info.MultiplyByMonomial(ecBytes, 1, e));
if (e != BCExceptionNO)
return;
std::unique_ptr<std::vector<CBC_ReedSolomonGF256Poly*>> temp(
infoTemp->Divide(generator, e));
if (e != BCExceptionNO)
return;
CBC_ReedSolomonGF256Poly* remainder = (*temp)[1];
std::vector<int32_t>* coefficients = remainder->GetCoefficients();
size_t numZeroCoefficients =
ecBytes > coefficients->size() ? ecBytes - coefficients->size() : 0;
for (size_t i = 0; i < numZeroCoefficients; i++)
(*toEncode)[dataBytes + i] = 0;
for (size_t y = 0; y < coefficients->size(); y++)
(*toEncode)[dataBytes + numZeroCoefficients + y] = (*coefficients)[y];
for (size_t k = 0; k < temp->size(); k++)
delete (*temp)[k];
}
CBC_ReedSolomonEncoder::~CBC_ReedSolomonEncoder() {
for (size_t i = 0; i < m_cachedGenerators.size(); i++)
delete m_cachedGenerators[i];
}
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