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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 2012 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_PDF417Common.h"
#include "BC_PDF417ECModulusPoly.h"
#include "BC_PDF417ECModulusGF.h"
CBC_PDF417ECModulusGF* CBC_PDF417ECModulusGF::PDF417_GF = NULL;
void CBC_PDF417ECModulusGF::Initialize(FX_INT32 &e)
{
PDF417_GF = FX_NEW CBC_PDF417ECModulusGF(CBC_PDF417Common::NUMBER_OF_CODEWORDS, 3, e);
}
void CBC_PDF417ECModulusGF::Finalize()
{
delete PDF417_GF;
}
CBC_PDF417ECModulusGF::CBC_PDF417ECModulusGF(FX_INT32 modulus, FX_INT32 generator, FX_INT32 &e)
{
m_modulus = modulus;
m_expTable.SetSize(modulus);
m_logTable.SetSize(modulus);
FX_INT32 x = 1;
for (FX_INT32 i = 0; i < modulus; i++) {
m_expTable[i] = x;
x = (x * generator) % modulus;
}
for (FX_INT32 j = 0; j < modulus - 1; j++) {
m_logTable[m_expTable[j]] = j;
}
CFX_Int32Array zero;
zero.Add(0);
m_zero = FX_NEW CBC_PDF417ECModulusPoly(this, zero, e);
CFX_Int32Array one;
one.Add(1);
m_one = FX_NEW CBC_PDF417ECModulusPoly(this, one, e);
}
CBC_PDF417ECModulusGF::~CBC_PDF417ECModulusGF()
{
delete m_zero;
delete m_one;
}
CBC_PDF417ECModulusPoly* CBC_PDF417ECModulusGF::getZero()
{
return m_zero;
}
CBC_PDF417ECModulusPoly* CBC_PDF417ECModulusGF::getOne()
{
return m_one;
}
CBC_PDF417ECModulusPoly* CBC_PDF417ECModulusGF::buildMonomial(FX_INT32 degree, FX_INT32 coefficient, FX_INT32 &e)
{
if (degree < 0) {
e = BCExceptionIllegalArgument;
return NULL;
}
CBC_PDF417ECModulusPoly* modulusPoly = NULL;
if (coefficient == 0) {
modulusPoly = FX_NEW CBC_PDF417ECModulusPoly(m_zero->getField(), m_zero->getCoefficients(), e);
BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
return modulusPoly;
}
CFX_Int32Array coefficients;
coefficients.SetSize(degree + 1);
coefficients[0] = coefficient;
modulusPoly = FX_NEW CBC_PDF417ECModulusPoly(this, coefficients, e);
BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
return modulusPoly;
}
FX_INT32 CBC_PDF417ECModulusGF::add(FX_INT32 a, FX_INT32 b)
{
return (a + b) % m_modulus;
}
FX_INT32 CBC_PDF417ECModulusGF::subtract(FX_INT32 a, FX_INT32 b)
{
return (m_modulus + a - b) % m_modulus;
}
FX_INT32 CBC_PDF417ECModulusGF::exp(FX_INT32 a)
{
return m_expTable[a];
}
FX_INT32 CBC_PDF417ECModulusGF::log(FX_INT32 a, FX_INT32 &e)
{
if (a == 0) {
e = BCExceptionIllegalArgument;
return -1;
}
return m_logTable[a];
}
FX_INT32 CBC_PDF417ECModulusGF::inverse(FX_INT32 a, FX_INT32 &e)
{
if (a == 0) {
e = BCExceptionIllegalArgument;
return -1;
}
return m_expTable[m_modulus - m_logTable[a] - 1];
}
FX_INT32 CBC_PDF417ECModulusGF::multiply(FX_INT32 a, FX_INT32 b)
{
if (a == 0 || b == 0) {
return 0;
}
return m_expTable[(m_logTable[a] + m_logTable[b]) % (m_modulus - 1)];
}
FX_INT32 CBC_PDF417ECModulusGF::getSize()
{
return m_modulus;
}
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