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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_ReedSolomonGF256Poly.h"
#include "BC_ReedSolomonGF256.h"
CBC_ReedSolomonGF256 *CBC_ReedSolomonGF256::QRCodeFild = NULL;
CBC_ReedSolomonGF256 *CBC_ReedSolomonGF256::DataMatrixField = NULL;
void CBC_ReedSolomonGF256::Initialize()
{
QRCodeFild = FX_NEW CBC_ReedSolomonGF256(0x011D);
QRCodeFild->Init();
DataMatrixField = FX_NEW CBC_ReedSolomonGF256(0x012D);
DataMatrixField->Init();
}
void CBC_ReedSolomonGF256::Finalize()
{
if (QRCodeFild) {
delete QRCodeFild;
}
QRCodeFild = NULL;
if (DataMatrixField) {
delete DataMatrixField;
}
DataMatrixField = NULL;
}
CBC_ReedSolomonGF256::CBC_ReedSolomonGF256(FX_INT32 primitive)
{
FX_INT32 x = 1;
for(FX_INT32 j = 0; j < 256; j++) {
m_expTable[j] = x;
x <<= 1;
if(x >= 0x100) {
x ^= primitive;
}
}
for(FX_INT32 i = 0; i < 255; i++) {
m_logTable[m_expTable[i]] = i;
}
m_logTable[0] = 0;
}
void CBC_ReedSolomonGF256::Init()
{
m_zero = FX_NEW CBC_ReedSolomonGF256Poly(this, 0);
m_one = FX_NEW CBC_ReedSolomonGF256Poly(this, 1);
}
CBC_ReedSolomonGF256::~CBC_ReedSolomonGF256()
{
if(m_zero != NULL) {
delete m_zero;
m_zero = NULL;
}
if(m_one != NULL) {
delete m_one;
m_one = NULL;
}
}
CBC_ReedSolomonGF256Poly* CBC_ReedSolomonGF256::GetZero()
{
return m_zero;
}
CBC_ReedSolomonGF256Poly* CBC_ReedSolomonGF256::GetOne()
{
return m_one;
}
CBC_ReedSolomonGF256Poly* CBC_ReedSolomonGF256::BuildMonomial(FX_INT32 degree, FX_INT32 coefficient, FX_INT32 &e)
{
if(degree < 0) {
e = BCExceptionDegreeIsNegative;
BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
}
if(coefficient == 0) {
CBC_ReedSolomonGF256Poly* temp = m_zero->Clone(e);
BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
return temp;
}
CFX_Int32Array coefficients;
coefficients.SetSize(degree + 1);
coefficients[0] = coefficient;
CBC_ReedSolomonGF256Poly *temp = FX_NEW CBC_ReedSolomonGF256Poly();
temp->Init(this, &coefficients, e);
BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
return temp;
}
FX_INT32 CBC_ReedSolomonGF256::AddOrSubtract(FX_INT32 a, FX_INT32 b)
{
return a ^ b;
}
FX_INT32 CBC_ReedSolomonGF256::Exp(FX_INT32 a)
{
return m_expTable[a];
}
FX_INT32 CBC_ReedSolomonGF256::Log(FX_INT32 a, FX_INT32 &e)
{
if(a == 0) {
e = BCExceptionAIsZero;
BC_EXCEPTION_CHECK_ReturnValue(e, 0);
}
return m_logTable[a];
}
FX_INT32 CBC_ReedSolomonGF256::Inverse(FX_INT32 a, FX_INT32 &e)
{
if(a == 0) {
e = BCExceptionAIsZero;
BC_EXCEPTION_CHECK_ReturnValue(e, 0);
}
return m_expTable[255 - m_logTable[a]];
}
FX_INT32 CBC_ReedSolomonGF256::Multiply(FX_INT32 a, FX_INT32 b)
{
if(a == 0 || b == 0) {
return 0;
}
if(a == 1) {
return b;
}
if(b == 1) {
return a;
}
return m_expTable[(m_logTable[a] + m_logTable[b]) % 255];
}
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