1 files changed, 117 insertions, 0 deletions
diff --git a/xfa/fxbarcode/pdf417/BC_PDF417CodewordDecoder.cpp b/xfa/fxbarcode/pdf417/BC_PDF417CodewordDecoder.cpp
new file mode 100644
index 0000000000..dfbbc70264
--- /dev/null
+++ b/xfa/fxbarcode/pdf417/BC_PDF417CodewordDecoder.cpp
@@ -0,0 +1,117 @@
+// 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 2013 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 <limits>
+
+#include "xfa/fxbarcode/pdf417/BC_PDF417CodewordDecoder.h"
+#include "xfa/fxbarcode/pdf417/BC_PDF417Common.h"
+
+#define SYMBOL_TABLE_Length 2787
+
+FX_FLOAT CBC_PDF417CodewordDecoder::RATIOS_TABLE[2787][8] = {{0}};
+
+CBC_PDF417CodewordDecoder::CBC_PDF417CodewordDecoder() {}
+CBC_PDF417CodewordDecoder::~CBC_PDF417CodewordDecoder() {}
+void CBC_PDF417CodewordDecoder::Initialize() {
+  for (int32_t i = 0; i < SYMBOL_TABLE_Length; i++) {
+    int32_t currentSymbol = CBC_PDF417Common::SYMBOL_TABLE[i];
+    int32_t currentBit = currentSymbol & 0x1;
+    for (int32_t j = 0; j < CBC_PDF417Common::BARS_IN_MODULE; j++) {
+      FX_FLOAT size = 0.0f;
+      while ((currentSymbol & 0x1) == currentBit) {
+        size += 1.0f;
+        currentSymbol >>= 1;
+      }
+      currentBit = currentSymbol & 0x1;
+      RATIOS_TABLE[i][CBC_PDF417Common::BARS_IN_MODULE - j - 1] =
+          size / CBC_PDF417Common::MODULES_IN_CODEWORD;
+    }
+  }
+}
+void CBC_PDF417CodewordDecoder::Finalize() {}
+int32_t CBC_PDF417CodewordDecoder::getDecodedValue(
+    CFX_Int32Array& moduleBitCount) {
+  CFX_Int32Array* array = sampleBitCounts(moduleBitCount);
+  int32_t decodedValue = getDecodedCodewordValue(*array);
+  delete array;
+  if (decodedValue != -1) {
+    return decodedValue;
+  }
+  return getClosestDecodedValue(moduleBitCount);
+}
+CFX_Int32Array* CBC_PDF417CodewordDecoder::sampleBitCounts(
+    CFX_Int32Array& moduleBitCount) {
+  FX_FLOAT bitCountSum =
+      (FX_FLOAT)CBC_PDF417Common::getBitCountSum(moduleBitCount);
+  CFX_Int32Array* bitCount = new CFX_Int32Array();
+  bitCount->SetSize(CBC_PDF417Common::BARS_IN_MODULE);
+  int32_t bitCountIndex = 0;
+  int32_t sumPreviousBits = 0;
+  for (int32_t i = 0; i < CBC_PDF417Common::MODULES_IN_CODEWORD; i++) {
+    FX_FLOAT sampleIndex =
+        bitCountSum / (2 * CBC_PDF417Common::MODULES_IN_CODEWORD) +
+        (i * bitCountSum) / CBC_PDF417Common::MODULES_IN_CODEWORD;
+    if (sumPreviousBits + moduleBitCount.GetAt(bitCountIndex) <= sampleIndex) {
+      sumPreviousBits += moduleBitCount.GetAt(bitCountIndex);
+      bitCountIndex++;
+    }
+    bitCount->SetAt(bitCountIndex, bitCount->GetAt(bitCountIndex) + 1);
+  }
+  return bitCount;
+}
+int32_t CBC_PDF417CodewordDecoder::getDecodedCodewordValue(
+    CFX_Int32Array& moduleBitCount) {
+  int32_t decodedValue = getBitValue(moduleBitCount);
+  return CBC_PDF417Common::getCodeword(decodedValue) == -1 ? -1 : decodedValue;
+}
+int32_t CBC_PDF417CodewordDecoder::getBitValue(CFX_Int32Array& moduleBitCount) {
+  int64_t result = 0;
+  for (int32_t i = 0; i < moduleBitCount.GetSize(); i++) {
+    for (int32_t bit = 0; bit < moduleBitCount.GetAt(i); bit++) {
+      result = (result << 1) | (i % 2 == 0 ? 1 : 0);
+    }
+  }
+  return (int32_t)result;
+}
+int32_t CBC_PDF417CodewordDecoder::getClosestDecodedValue(
+    CFX_Int32Array& moduleBitCount) {
+  int32_t bitCountSum = CBC_PDF417Common::getBitCountSum(moduleBitCount);
+  CFX_FloatArray bitCountRatios;
+  bitCountRatios.SetSize(CBC_PDF417Common::BARS_IN_MODULE);
+  for (int32_t i = 0; i < bitCountRatios.GetSize(); i++) {
+    bitCountRatios[i] = moduleBitCount.GetAt(i) / (FX_FLOAT)bitCountSum;
+  }
+  FX_FLOAT bestMatchError = std::numeric_limits<int32_t>::max();
+  int32_t bestMatch = -1;
+  for (int32_t j = 0; j < SYMBOL_TABLE_Length; j++) {
+    FX_FLOAT error = 0.0f;
+    for (int32_t k = 0; k < CBC_PDF417Common::BARS_IN_MODULE; k++) {
+      FX_FLOAT diff = RATIOS_TABLE[j][k] - bitCountRatios[k];
+      error += diff * diff;
+    }
+    if (error < bestMatchError) {
+      bestMatchError = error;
+      bestMatch = CBC_PDF417Common::SYMBOL_TABLE[j];
+    }
+  }
+  return bestMatch;
+}