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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 2009 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 "xfa/fxbarcode/BC_UtilRSS.h"
#include <memory>
#include "core/fxcrt/include/fx_basic.h"
#include "xfa/fxbarcode/utils.h"
CBC_UtilRSS::CBC_UtilRSS() {}
CBC_UtilRSS::~CBC_UtilRSS() {}
CFX_Int32Array* CBC_UtilRSS::GetRssWidths(int32_t val,
int32_t n,
int32_t elements,
int32_t maxWidth,
FX_BOOL noNarrow) {
std::unique_ptr<CFX_Int32Array> widths(new CFX_Int32Array);
widths->SetSize(elements);
int32_t bar;
int32_t narrowMask = 0;
for (bar = 0; bar < elements - 1; bar++) {
narrowMask |= (1 << bar);
int32_t elmWidth = 1;
int32_t subVal;
while (TRUE) {
subVal = Combins(n - elmWidth - 1, elements - bar - 2);
if (noNarrow && (narrowMask == 0) &&
(n - elmWidth - (elements - bar - 1) >= elements - bar - 1)) {
subVal -= Combins(n - elmWidth - (elements - bar), elements - bar - 2);
}
if (elements - bar - 1 > 1) {
int32_t lessVal = 0;
for (int32_t mxwElement = n - elmWidth - (elements - bar - 2);
mxwElement > maxWidth; mxwElement--) {
lessVal += Combins(n - elmWidth - mxwElement - 1, elements - bar - 3);
}
subVal -= lessVal * (elements - 1 - bar);
} else if (n - elmWidth > maxWidth) {
subVal--;
}
val -= subVal;
if (val < 0) {
break;
}
elmWidth++;
narrowMask &= ~(1 << bar);
}
val += subVal;
n -= elmWidth;
(*widths)[bar] = elmWidth;
}
(*widths)[bar] = n;
return widths.release();
}
int32_t CBC_UtilRSS::GetRSSvalue(CFX_Int32Array& widths,
int32_t maxWidth,
FX_BOOL noNarrow) {
int32_t elements = widths.GetSize();
int32_t n = 0;
for (int32_t i = 0; i < elements; i++) {
n += widths[i];
}
int32_t val = 0;
int32_t narrowMask = 0;
for (int32_t bar = 0; bar < elements - 1; bar++) {
int32_t elmWidth;
for (elmWidth = 1, narrowMask |= (1 << bar); elmWidth < widths[bar];
elmWidth++, narrowMask &= ~(1 << bar)) {
int32_t subVal = Combins(n - elmWidth - 1, elements - bar - 2);
if (noNarrow && (narrowMask == 0) &&
(n - elmWidth - (elements - bar - 1) >= elements - bar - 1)) {
subVal -= Combins(n - elmWidth - (elements - bar), elements - bar - 2);
}
if (elements - bar - 1 > 1) {
int32_t lessVal = 0;
for (int32_t mxwElement = n - elmWidth - (elements - bar - 2);
mxwElement > maxWidth; mxwElement--) {
lessVal += Combins(n - elmWidth - mxwElement - 1, elements - bar - 3);
}
subVal -= lessVal * (elements - 1 - bar);
} else if (n - elmWidth > maxWidth) {
subVal--;
}
val += subVal;
}
n -= elmWidth;
}
return val;
}
int32_t CBC_UtilRSS::Combins(int32_t n, int32_t r) {
int32_t maxDenom;
int32_t minDenom;
if (n - r > r) {
minDenom = r;
maxDenom = n - r;
} else {
minDenom = n - r;
maxDenom = r;
}
int32_t val = 1;
int32_t j = 1;
for (int32_t i = n; i > maxDenom; i--) {
val *= i;
if (j <= minDenom) {
val /= j;
j++;
}
}
while (j <= minDenom) {
val /= j;
j++;
}
return val;
}
CFX_Int32Array* CBC_UtilRSS::Elements(CFX_Int32Array& eDist,
int32_t N,
int32_t K) {
CFX_Int32Array* widths = new CFX_Int32Array;
widths->SetSize(eDist.GetSize() + 2);
int32_t twoK = K << 1;
(*widths)[0] = 1;
int32_t i;
int32_t minEven = 10;
int32_t barSum = 1;
for (i = 1; i < twoK - 2; i += 2) {
(*widths)[i] = eDist[i - 1] - (*widths)[i - 1];
(*widths)[i + 1] = eDist[i] - (*widths)[i];
barSum += (*widths)[i] + (*widths)[i + 1];
if ((*widths)[i] < minEven) {
minEven = (*widths)[i];
}
}
(*widths)[twoK - 1] = N - barSum;
if ((*widths)[twoK - 1] < minEven) {
minEven = (*widths)[twoK - 1];
}
if (minEven > 1) {
for (i = 0; i < twoK; i += 2) {
(*widths)[i] += minEven - 1;
(*widths)[i + 1] -= minEven - 1;
}
}
return widths;
}
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