diff options
Diffstat (limited to 'xfa/src/fxbarcode/oned/BC_OneDimReader.cpp')
| -rw-r--r-- | xfa/src/fxbarcode/oned/BC_OneDimReader.cpp | 235 |
1 files changed, 235 insertions, 0 deletions
diff --git a/xfa/src/fxbarcode/oned/BC_OneDimReader.cpp b/xfa/src/fxbarcode/oned/BC_OneDimReader.cpp new file mode 100644 index 0000000000..f1db94a6a1 --- /dev/null +++ b/xfa/src/fxbarcode/oned/BC_OneDimReader.cpp @@ -0,0 +1,235 @@ +// 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 "../barcode.h"
+#include "../BC_Reader.h"
+#include "../common/BC_CommonBitArray.h"
+#include "BC_OneDReader.h"
+#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;
+}
|