1 files changed, 118 insertions, 0 deletions
diff --git a/xfa/src/fxbarcode/pdf417/BC_PDF417CodewordDecoder.cpp b/xfa/src/fxbarcode/pdf417/BC_PDF417CodewordDecoder.cpp
new file mode 100644
index 0000000000..bf16bc25e0
--- /dev/null
+++ b/xfa/src/fxbarcode/pdf417/BC_PDF417CodewordDecoder.cpp
@@ -0,0 +1,118 @@
+// 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 "../barcode.h"
+#include "BC_PDF417Common.h"
+#include "BC_PDF417CodewordDecoder.h"
+#define     SYMBOL_TABLE_Length       2787
+#define     Float_MAX_VALUE           2147483647
+FX_FLOAT CBC_PDF417CodewordDecoder::RATIOS_TABLE[2787][8] = {0};
+CBC_PDF417CodewordDecoder::CBC_PDF417CodewordDecoder()
+{
+}
+CBC_PDF417CodewordDecoder::~CBC_PDF417CodewordDecoder()
+{
+}
+void CBC_PDF417CodewordDecoder::Initialize()
+{
+    for (FX_INT32 i = 0; i < SYMBOL_TABLE_Length; i++) {
+        FX_INT32 currentSymbol = CBC_PDF417Common::SYMBOL_TABLE[i];
+        FX_INT32 currentBit = currentSymbol & 0x1;
+        for (FX_INT32 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()
+{
+}
+FX_INT32 CBC_PDF417CodewordDecoder::getDecodedValue(CFX_Int32Array& moduleBitCount)
+{
+    CFX_Int32Array* array = sampleBitCounts(moduleBitCount);
+    FX_INT32 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 = FX_NEW CFX_Int32Array();
+    bitCount->SetSize(CBC_PDF417Common::BARS_IN_MODULE);
+    FX_INT32 bitCountIndex = 0;
+    FX_INT32 sumPreviousBits = 0;
+    for (FX_INT32 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;
+}
+FX_INT32 CBC_PDF417CodewordDecoder::getDecodedCodewordValue(CFX_Int32Array& moduleBitCount)
+{
+    FX_INT32 decodedValue = getBitValue(moduleBitCount);
+    return CBC_PDF417Common::getCodeword(decodedValue) == -1 ? -1 : decodedValue;
+}
+FX_INT32 CBC_PDF417CodewordDecoder::getBitValue(CFX_Int32Array& moduleBitCount)
+{
+    FX_INT64 result = 0;
+    for (FX_INT32 i = 0; i < moduleBitCount.GetSize(); i++) {
+        for (FX_INT32 bit = 0; bit < moduleBitCount.GetAt(i); bit++) {
+            result = (result << 1) | (i % 2 == 0 ? 1 : 0);
+        }
+    }
+    return (FX_INT32) result;
+}
+FX_INT32 CBC_PDF417CodewordDecoder::getClosestDecodedValue(CFX_Int32Array& moduleBitCount)
+{
+    FX_INT32 bitCountSum = CBC_PDF417Common::getBitCountSum(moduleBitCount);
+    CFX_FloatArray bitCountRatios;
+    bitCountRatios.SetSize(CBC_PDF417Common::BARS_IN_MODULE);
+    for (FX_INT32 i = 0; i < bitCountRatios.GetSize(); i++) {
+        bitCountRatios[i] = moduleBitCount.GetAt(i) / (FX_FLOAT) bitCountSum;
+    }
+    FX_FLOAT bestMatchError = (FX_FLOAT)Float_MAX_VALUE;
+    FX_INT32 bestMatch = -1;
+    for (FX_INT32 j = 0; j < SYMBOL_TABLE_Length; j++) {
+        FX_FLOAT error = 0.0f;
+        for (FX_INT32 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;
+}