diff options
Diffstat (limited to 'xfa/fxbarcode/oned/BC_OneDimReader.cpp')
| -rw-r--r-- | xfa/fxbarcode/oned/BC_OneDimReader.cpp | 219 |
1 files changed, 219 insertions, 0 deletions
diff --git a/xfa/fxbarcode/oned/BC_OneDimReader.cpp b/xfa/fxbarcode/oned/BC_OneDimReader.cpp new file mode 100644 index 0000000000..5187c34af9 --- /dev/null +++ b/xfa/fxbarcode/oned/BC_OneDimReader.cpp @@ -0,0 +1,219 @@ +// 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/fxbarcode/oned/BC_OneDimReader.h" + +#include <memory> + +#include "xfa/fxbarcode/BC_Reader.h" +#include "xfa/fxbarcode/common/BC_CommonBitArray.h" +#include "xfa/fxbarcode/oned/BC_OneDReader.h" +#include "xfa/fxbarcode/utils.h" + +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) { + delete startRange; + 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) { + std::unique_ptr<CFX_Int32Array> result(FindStartGuardPattern(row, e)); + BC_EXCEPTION_CHECK_ReturnValue(e, ""); + 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; +} |