// 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; }