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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 2013 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 <limits>
#include "xfa/fxbarcode/pdf417/BC_PDF417CodewordDecoder.h"
#include "xfa/fxbarcode/pdf417/BC_PDF417Common.h"
#define SYMBOL_TABLE_Length 2787
namespace {
FX_FLOAT RATIOS_TABLE[SYMBOL_TABLE_Length][8] = {{0}};
} // namespace
CBC_PDF417CodewordDecoder::CBC_PDF417CodewordDecoder() {}
CBC_PDF417CodewordDecoder::~CBC_PDF417CodewordDecoder() {}
void CBC_PDF417CodewordDecoder::Initialize() {
for (int32_t i = 0; i < SYMBOL_TABLE_Length; i++) {
int32_t currentSymbol = CBC_PDF417Common::SYMBOL_TABLE[i];
int32_t currentBit = currentSymbol & 0x1;
for (int32_t j = 0; j < CBC_PDF417Common::BARS_IN_MODULE; j++) {
FX_FLOAT size = 0.0f;
while ((currentSymbol & 0x1) == currentBit) {
size += 1.0f;
currentSymbol >>= 1;
}
currentBit = currentSymbol & 0x1;
RATIOS_TABLE[i][CBC_PDF417Common::BARS_IN_MODULE - j - 1] =
size / CBC_PDF417Common::MODULES_IN_CODEWORD;
}
}
}
void CBC_PDF417CodewordDecoder::Finalize() {}
int32_t CBC_PDF417CodewordDecoder::getDecodedValue(
CFX_Int32Array& moduleBitCount) {
CFX_Int32Array* array = sampleBitCounts(moduleBitCount);
int32_t decodedValue = getDecodedCodewordValue(*array);
delete array;
if (decodedValue != -1) {
return decodedValue;
}
return getClosestDecodedValue(moduleBitCount);
}
CFX_Int32Array* CBC_PDF417CodewordDecoder::sampleBitCounts(
CFX_Int32Array& moduleBitCount) {
FX_FLOAT bitCountSum =
(FX_FLOAT)CBC_PDF417Common::getBitCountSum(moduleBitCount);
CFX_Int32Array* bitCount = new CFX_Int32Array();
bitCount->SetSize(CBC_PDF417Common::BARS_IN_MODULE);
int32_t bitCountIndex = 0;
int32_t sumPreviousBits = 0;
for (int32_t i = 0; i < CBC_PDF417Common::MODULES_IN_CODEWORD; i++) {
FX_FLOAT sampleIndex =
bitCountSum / (2 * CBC_PDF417Common::MODULES_IN_CODEWORD) +
(i * bitCountSum) / CBC_PDF417Common::MODULES_IN_CODEWORD;
if (sumPreviousBits + moduleBitCount.GetAt(bitCountIndex) <= sampleIndex) {
sumPreviousBits += moduleBitCount.GetAt(bitCountIndex);
bitCountIndex++;
}
bitCount->SetAt(bitCountIndex, bitCount->GetAt(bitCountIndex) + 1);
}
return bitCount;
}
int32_t CBC_PDF417CodewordDecoder::getDecodedCodewordValue(
CFX_Int32Array& moduleBitCount) {
int32_t decodedValue = getBitValue(moduleBitCount);
return CBC_PDF417Common::getCodeword(decodedValue) == -1 ? -1 : decodedValue;
}
int32_t CBC_PDF417CodewordDecoder::getBitValue(CFX_Int32Array& moduleBitCount) {
int64_t result = 0;
for (int32_t i = 0; i < moduleBitCount.GetSize(); i++) {
for (int32_t bit = 0; bit < moduleBitCount.GetAt(i); bit++) {
result = (result << 1) | (i % 2 == 0 ? 1 : 0);
}
}
return (int32_t)result;
}
int32_t CBC_PDF417CodewordDecoder::getClosestDecodedValue(
CFX_Int32Array& moduleBitCount) {
int32_t bitCountSum = CBC_PDF417Common::getBitCountSum(moduleBitCount);
CFX_FloatArray bitCountRatios;
bitCountRatios.SetSize(CBC_PDF417Common::BARS_IN_MODULE);
for (int32_t i = 0; i < bitCountRatios.GetSize(); i++) {
bitCountRatios[i] = moduleBitCount.GetAt(i) / (FX_FLOAT)bitCountSum;
}
FX_FLOAT bestMatchError = std::numeric_limits<int32_t>::max();
int32_t bestMatch = -1;
for (int32_t j = 0; j < SYMBOL_TABLE_Length; j++) {
FX_FLOAT error = 0.0f;
for (int32_t k = 0; k < CBC_PDF417Common::BARS_IN_MODULE; k++) {
FX_FLOAT diff = RATIOS_TABLE[j][k] - bitCountRatios[k];
error += diff * diff;
}
if (error < bestMatchError) {
bestMatchError = error;
bestMatch = CBC_PDF417Common::SYMBOL_TABLE[j];
}
}
return bestMatch;
}
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