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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
#include "barcode.h"
#include "include/BC_Reader.h"
#include "include/BC_OneDReader.h"
#include "include/BC_CommonBitArray.h"
#include "include/BC_OneDimReader.h"
const FX_INT32 CBC_OneDimReader::MAX_AVG_VARIANCE = (FX_INT32)(256 * 0.48f);
const FX_INT32 CBC_OneDimReader::MAX_INDIVIDUAL_VARIANCE = (FX_INT32)(256 * 0.7f);
const FX_INT32 CBC_OneDimReader::START_END_PATTERN[3] = {1, 1, 1};
const FX_INT32 CBC_OneDimReader::MIDDLE_PATTERN[5] = {1, 1, 1, 1, 1};
const FX_INT32 CBC_OneDimReader::L_PATTERNS[10][4] = {
{3, 2, 1, 1},
{2, 2, 2, 1},
{2, 1, 2, 2},
{1, 4, 1, 1},
{1, 1, 3, 2},
{1, 2, 3, 1},
{1, 1, 1, 4},
{1, 3, 1, 2},
{1, 2, 1, 3},
{3, 1, 1, 2}
};
const FX_INT32 CBC_OneDimReader::L_AND_G_PATTERNS[20][4] = {
{3, 2, 1, 1},
{2, 2, 2, 1},
{2, 1, 2, 2},
{1, 4, 1, 1},
{1, 1, 3, 2},
{1, 2, 3, 1},
{1, 1, 1, 4},
{1, 3, 1, 2},
{1, 2, 1, 3},
{3, 1, 1, 2},
{1, 1, 2, 3},
{1, 2, 2, 2},
{2, 2, 1, 2},
{1, 1, 4, 1},
{2, 3, 1, 1},
{1, 3, 2, 1},
{4, 1, 1, 1},
{2, 1, 3, 1},
{3, 1, 2, 1},
{2, 1, 1, 3}
};
CBC_OneDimReader::CBC_OneDimReader()
{
}
CBC_OneDimReader::~CBC_OneDimReader()
{
}
CFX_Int32Array *CBC_OneDimReader::FindStartGuardPattern(CBC_CommonBitArray *row, FX_INT32 &e)
{
FX_BOOL foundStart = FALSE;
CFX_Int32Array *startRange = NULL;
CFX_Int32Array startEndPattern;
startEndPattern.SetSize(3);
startEndPattern[0] = START_END_PATTERN[0];
startEndPattern[1] = START_END_PATTERN[1];
startEndPattern[2] = START_END_PATTERN[2];
FX_INT32 nextStart = 0;
while (!foundStart) {
if(startRange != NULL) {
delete startRange;
startRange = NULL;
}
startRange = FindGuardPattern(row, nextStart, FALSE, &startEndPattern, e);
BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
FX_INT32 start = (*startRange)[0];
nextStart = (*startRange)[1];
if (start <= 1) {
break;
}
FX_INT32 quietStart = start - (nextStart - start);
if (quietStart >= 0) {
FX_BOOL booT = row->IsRange(quietStart, start, FALSE, e);
BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
foundStart = booT;
}
}
return startRange;
}
CFX_ByteString CBC_OneDimReader::DecodeRow(FX_INT32 rowNumber, CBC_CommonBitArray *row, FX_INT32 hints, FX_INT32 &e)
{
CFX_Int32Array* StartPattern = FindStartGuardPattern(row, e);
BC_EXCEPTION_CHECK_ReturnValue(e, "");
CBC_AutoPtr<CFX_Int32Array > result(StartPattern);
CFX_ByteString temp = DecodeRow(rowNumber, row, result.get(), hints, e);
BC_EXCEPTION_CHECK_ReturnValue(e, "");
return temp;
}
CFX_ByteString CBC_OneDimReader::DecodeRow(FX_INT32 rowNumber, CBC_CommonBitArray *row, CFX_Int32Array *startGuardRange, FX_INT32 hints, FX_INT32 &e)
{
CFX_ByteString result;
FX_INT32 endStart = DecodeMiddle(row, startGuardRange, result, e);
BC_EXCEPTION_CHECK_ReturnValue(e, "");
FX_BOOL b = CheckChecksum(result, e);
BC_EXCEPTION_CHECK_ReturnValue(e, "");
if (!b) {
e = BCExceptionChecksumException;
return "";
}
return result;
}
FX_BOOL CBC_OneDimReader::CheckChecksum(CFX_ByteString &s, FX_INT32 &e)
{
FX_BOOL temp = CheckStandardUPCEANChecksum(s, e);
BC_EXCEPTION_CHECK_ReturnValue(e, FALSE);
return temp;
}
FX_BOOL CBC_OneDimReader::CheckStandardUPCEANChecksum(CFX_ByteString &s, FX_INT32 &e)
{
FX_INT32 length = s.GetLength();
if (length == 0) {
return FALSE;
}
FX_INT32 sum = 0;
for (FX_INT32 i = length - 2; i >= 0; i -= 2) {
FX_INT32 digit = (FX_INT32) s[i] - (FX_INT32) '0';
if (digit < 0 || digit > 9) {
e = BCExceptionFormatException;
return FALSE;
}
sum += digit;
}
sum *= 3;
for (FX_INT32 j = length - 1; j >= 0; j -= 2) {
FX_INT32 digit = (FX_INT32) s[j] - (FX_INT32) '0';
if (digit < 0 || digit > 9) {
e = BCExceptionFormatException;
return FALSE;
}
sum += digit;
}
return sum % 10 == 0;
}
CFX_Int32Array *CBC_OneDimReader::DecodeEnd(CBC_CommonBitArray* row, FX_INT32 endStart, FX_INT32 &e)
{
CFX_Int32Array startEndPattern;
startEndPattern.Add(START_END_PATTERN[0]);
startEndPattern.Add(START_END_PATTERN[1]);
startEndPattern.Add(START_END_PATTERN[2]);
CFX_Int32Array* FindGuard = FindGuardPattern(row, endStart, FALSE, &startEndPattern, e);
BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
return FindGuard;
}
CFX_Int32Array *CBC_OneDimReader::FindGuardPattern(CBC_CommonBitArray *row, FX_INT32 rowOffset, FX_BOOL whiteFirst, CFX_Int32Array *pattern, FX_INT32 &e)
{
FX_INT32 patternLength = pattern->GetSize();
CFX_Int32Array counters;
counters.SetSize(patternLength);
FX_INT32 width = row->GetSize();
FX_BOOL isWhite = FALSE;
while (rowOffset < width) {
isWhite = !row->Get(rowOffset);
if (whiteFirst == isWhite) {
break;
}
rowOffset++;
}
FX_INT32 counterPosition = 0;
FX_INT32 patternStart = rowOffset;
for (FX_INT32 x = rowOffset; x < width; x++) {
FX_BOOL pixel = row->Get(x);
if (pixel ^ isWhite) {
counters[counterPosition]++;
} else {
if (counterPosition == patternLength - 1) {
if (PatternMatchVariance(&counters, &(*pattern)[0], MAX_INDIVIDUAL_VARIANCE) < MAX_AVG_VARIANCE) {
CFX_Int32Array *result = FX_NEW CFX_Int32Array();
result->SetSize(2);
(*result)[0] = patternStart;
(*result)[1] = x;
return result;
}
patternStart += counters[0] + counters[1];
for (FX_INT32 y = 2; y < patternLength; y++) {
counters[y - 2] = counters[y];
}
counters[patternLength - 2] = 0;
counters[patternLength - 1] = 0;
counterPosition--;
} else {
counterPosition++;
}
counters[counterPosition] = 1;
isWhite = !isWhite;
}
}
e = BCExceptionNotFound;
BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
return NULL;
}
FX_INT32 CBC_OneDimReader::DecodeDigit(CBC_CommonBitArray *row, CFX_Int32Array *counters, FX_INT32 rowOffset, const FX_INT32* patterns, FX_INT32 patternLength, FX_INT32 &e)
{
RecordPattern(row, rowOffset, counters, e);
BC_EXCEPTION_CHECK_ReturnValue(e, 0);
FX_INT32 bestVariance = MAX_AVG_VARIANCE;
FX_INT32 bestMatch = -1;
FX_INT32 max = patternLength;
for (FX_INT32 i = 0; i < max; i++) {
FX_INT32 variance = PatternMatchVariance(counters, &patterns[i * 4], MAX_INDIVIDUAL_VARIANCE);
if (variance < bestVariance) {
bestVariance = variance;
bestMatch = i;
}
}
if (bestMatch >= 0) {
return bestMatch;
} else {
e = BCExceptionNotFound;
return 0;
}
return 0;
}
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