// 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 2008 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/src/fxbarcode/barcode.h" | |
#include "xfa/src/fxbarcode/BC_Reader.h" | |
#include "xfa/src/fxbarcode/common/BC_CommonBitArray.h" | |
#include "BC_OneDReader.h" | |
#include "BC_OneDimReader.h" | |
const int32_t CBC_OneDimReader::MAX_AVG_VARIANCE = (int32_t)(256 * 0.48f); | |
const int32_t CBC_OneDimReader::MAX_INDIVIDUAL_VARIANCE = (int32_t)(256 * 0.7f); | |
const int32_t CBC_OneDimReader::START_END_PATTERN[3] = {1, 1, 1}; | |
const int32_t CBC_OneDimReader::MIDDLE_PATTERN[5] = {1, 1, 1, 1, 1}; | |
const int32_t 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 int32_t 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, | |
int32_t& 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]; | |
int32_t nextStart = 0; | |
while (!foundStart) { | |
if (startRange != NULL) { | |
delete startRange; | |
startRange = NULL; | |
} | |
startRange = FindGuardPattern(row, nextStart, FALSE, &startEndPattern, e); | |
BC_EXCEPTION_CHECK_ReturnValue(e, NULL); | |
int32_t start = (*startRange)[0]; | |
nextStart = (*startRange)[1]; | |
if (start <= 1) { | |
break; | |
} | |
int32_t 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(int32_t rowNumber, | |
CBC_CommonBitArray* row, | |
int32_t hints, | |
int32_t& 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(int32_t rowNumber, | |
CBC_CommonBitArray* row, | |
CFX_Int32Array* startGuardRange, | |
int32_t hints, | |
int32_t& e) { | |
CFX_ByteString result; | |
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, int32_t& e) { | |
FX_BOOL temp = CheckStandardUPCEANChecksum(s, e); | |
BC_EXCEPTION_CHECK_ReturnValue(e, FALSE); | |
return temp; | |
} | |
FX_BOOL CBC_OneDimReader::CheckStandardUPCEANChecksum(CFX_ByteString& s, | |
int32_t& e) { | |
int32_t length = s.GetLength(); | |
if (length == 0) { | |
return FALSE; | |
} | |
int32_t sum = 0; | |
for (int32_t i = length - 2; i >= 0; i -= 2) { | |
int32_t digit = (int32_t)s[i] - (int32_t)'0'; | |
if (digit < 0 || digit > 9) { | |
e = BCExceptionFormatException; | |
return FALSE; | |
} | |
sum += digit; | |
} | |
sum *= 3; | |
for (int32_t j = length - 1; j >= 0; j -= 2) { | |
int32_t digit = (int32_t)s[j] - (int32_t)'0'; | |
if (digit < 0 || digit > 9) { | |
e = BCExceptionFormatException; | |
return FALSE; | |
} | |
sum += digit; | |
} | |
return sum % 10 == 0; | |
} | |
CFX_Int32Array* CBC_OneDimReader::DecodeEnd(CBC_CommonBitArray* row, | |
int32_t endStart, | |
int32_t& 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, | |
int32_t rowOffset, | |
FX_BOOL whiteFirst, | |
CFX_Int32Array* pattern, | |
int32_t& e) { | |
int32_t patternLength = pattern->GetSize(); | |
CFX_Int32Array counters; | |
counters.SetSize(patternLength); | |
int32_t width = row->GetSize(); | |
FX_BOOL isWhite = FALSE; | |
while (rowOffset < width) { | |
isWhite = !row->Get(rowOffset); | |
if (whiteFirst == isWhite) { | |
break; | |
} | |
rowOffset++; | |
} | |
int32_t counterPosition = 0; | |
int32_t patternStart = rowOffset; | |
for (int32_t 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 = new CFX_Int32Array(); | |
result->SetSize(2); | |
(*result)[0] = patternStart; | |
(*result)[1] = x; | |
return result; | |
} | |
patternStart += counters[0] + counters[1]; | |
for (int32_t 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; | |
} | |
int32_t CBC_OneDimReader::DecodeDigit(CBC_CommonBitArray* row, | |
CFX_Int32Array* counters, | |
int32_t rowOffset, | |
const int32_t* patterns, | |
int32_t patternLength, | |
int32_t& e) { | |
RecordPattern(row, rowOffset, counters, e); | |
BC_EXCEPTION_CHECK_ReturnValue(e, 0); | |
int32_t bestVariance = MAX_AVG_VARIANCE; | |
int32_t bestMatch = -1; | |
int32_t max = patternLength; | |
for (int32_t i = 0; i < max; i++) { | |
int32_t 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; | |
} |