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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 "../../barcode.h"
#include "BC_ReedSolomonGF256.h"
#include "BC_ReedSolomonGF256Poly.h"
#include "BC_ReedSolomon.h"
CBC_ReedSolomonEncoder::CBC_ReedSolomonEncoder(CBC_ReedSolomonGF256* field)
{
m_field = field;
}
void CBC_ReedSolomonEncoder::Init()
{
m_cachedGenerators.Add(FX_NEW CBC_ReedSolomonGF256Poly(m_field, 1));
}
CBC_ReedSolomonGF256Poly* CBC_ReedSolomonEncoder::BuildGenerator(FX_INT32 degree, FX_INT32 &e)
{
if(degree >= m_cachedGenerators.GetSize()) {
CBC_ReedSolomonGF256Poly* lastGenerator = (CBC_ReedSolomonGF256Poly*)(m_cachedGenerators[m_cachedGenerators.GetSize() - 1]);
for(FX_INT32 d = m_cachedGenerators.GetSize(); d <= degree; d++) {
CFX_Int32Array temp;
temp.Add(1);
temp.Add(m_field->Exp(d - 1));
CBC_ReedSolomonGF256Poly temp_poly;
temp_poly.Init(m_field, &temp, e);
BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
CBC_ReedSolomonGF256Poly* nextGenerator = lastGenerator->Multiply(&temp_poly, e);
BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
m_cachedGenerators.Add(nextGenerator);
lastGenerator = nextGenerator;
}
}
return (CBC_ReedSolomonGF256Poly*)(m_cachedGenerators[degree]);
}
void CBC_ReedSolomonEncoder::Encode(CFX_Int32Array *toEncode, FX_INT32 ecBytes, FX_INT32 &e)
{
if(ecBytes == 0) {
e = BCExceptionNoCorrectionBytes;
BC_EXCEPTION_CHECK_ReturnVoid(e);
}
FX_INT32 dataBytes = toEncode->GetSize() - ecBytes;
if(dataBytes <= 0) {
e = BCExceptionNoDataBytesProvided;
BC_EXCEPTION_CHECK_ReturnVoid(e);
}
CBC_ReedSolomonGF256Poly* generator = BuildGenerator(ecBytes, e);
BC_EXCEPTION_CHECK_ReturnVoid(e);
CFX_Int32Array infoCoefficients;
infoCoefficients.SetSize(dataBytes);
for(FX_INT32 x = 0; x < dataBytes; x++) {
infoCoefficients[x] = toEncode->operator [](x);
}
CBC_ReedSolomonGF256Poly info;
info.Init(m_field, &infoCoefficients, e);
BC_EXCEPTION_CHECK_ReturnVoid(e);
CBC_ReedSolomonGF256Poly* rsg = info.MultiplyByMonomial(ecBytes, 1, e);
BC_EXCEPTION_CHECK_ReturnVoid(e);
CBC_AutoPtr<CBC_ReedSolomonGF256Poly> infoTemp(rsg);
CFX_PtrArray *pa = infoTemp->Divide(generator, e);
BC_EXCEPTION_CHECK_ReturnVoid(e);
CBC_AutoPtr<CFX_PtrArray > temp(pa);
CBC_ReedSolomonGF256Poly* remainder = (CBC_ReedSolomonGF256Poly*)(temp->operator [](1));
CFX_Int32Array* coefficients = remainder->GetCoefficients();
FX_INT32 numZeroCoefficients = ecBytes - coefficients->GetSize();
for(FX_INT32 i = 0; i < numZeroCoefficients; i++) {
(*toEncode)[dataBytes + i] = 0;
}
for(FX_INT32 y = 0; y < coefficients->GetSize(); y++) {
(*toEncode)[dataBytes + numZeroCoefficients + y] =
coefficients->operator [](y);
}
for (FX_INT32 k = 0; k < temp->GetSize(); k++) {
delete (CBC_ReedSolomonGF256Poly*)(*temp)[k];
}
}
CBC_ReedSolomonEncoder::~CBC_ReedSolomonEncoder()
{
for (FX_INT32 i = 0; i < m_cachedGenerators.GetSize(); i++) {
delete (CBC_ReedSolomonGF256Poly*)m_cachedGenerators[i];
}
}
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