1 files changed, 105 insertions, 0 deletions
diff --git a/fxbarcode/common/reedsolomon/BC_ReedSolomon.cpp b/fxbarcode/common/reedsolomon/BC_ReedSolomon.cpp
new file mode 100644
index 0000000000..bb33bbd0e9
--- /dev/null
+++ b/fxbarcode/common/reedsolomon/BC_ReedSolomon.cpp
@@ -0,0 +1,105 @@
+// 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 2007 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 "fxbarcode/common/reedsolomon/BC_ReedSolomon.h"
+
+#include <memory>
+
+#include "fxbarcode/common/reedsolomon/BC_ReedSolomonGF256.h"
+#include "fxbarcode/common/reedsolomon/BC_ReedSolomonGF256Poly.h"
+
+CBC_ReedSolomonEncoder::CBC_ReedSolomonEncoder(CBC_ReedSolomonGF256* field) {
+  m_field = field;
+}
+
+void CBC_ReedSolomonEncoder::Init() {
+  m_cachedGenerators.push_back(new CBC_ReedSolomonGF256Poly(m_field, 1));
+}
+
+CBC_ReedSolomonGF256Poly* CBC_ReedSolomonEncoder::BuildGenerator(size_t degree,
+                                                                 int32_t& e) {
+  if (degree >= m_cachedGenerators.size()) {
+    CBC_ReedSolomonGF256Poly* lastGenerator = m_cachedGenerators.back();
+    for (size_t d = m_cachedGenerators.size(); d <= degree; ++d) {
+      std::vector<int32_t> temp = {1, m_field->Exp(d - 1)};
+      CBC_ReedSolomonGF256Poly temp_poly;
+      temp_poly.Init(m_field, &temp, e);
+      if (e != BCExceptionNO)
+        return nullptr;
+      CBC_ReedSolomonGF256Poly* nextGenerator =
+          lastGenerator->Multiply(&temp_poly, e);
+      if (e != BCExceptionNO)
+        return nullptr;
+      m_cachedGenerators.push_back(nextGenerator);
+      lastGenerator = nextGenerator;
+    }
+  }
+  return m_cachedGenerators[degree];
+}
+
+void CBC_ReedSolomonEncoder::Encode(std::vector<int32_t>* toEncode,
+                                    size_t ecBytes,
+                                    int32_t& e) {
+  if (ecBytes == 0) {
+    e = BCExceptionNoCorrectionBytes;
+    return;
+  }
+  if (toEncode->size() <= ecBytes) {
+    e = BCExceptionNoDataBytesProvided;
+    return;
+  }
+  CBC_ReedSolomonGF256Poly* generator = BuildGenerator(ecBytes, e);
+  if (e != BCExceptionNO)
+    return;
+  size_t dataBytes = toEncode->size() - ecBytes;
+  std::vector<int32_t> infoCoefficients(dataBytes);
+  for (size_t x = 0; x < dataBytes; x++) {
+    infoCoefficients[x] = (*toEncode)[x];
+  }
+  CBC_ReedSolomonGF256Poly info;
+  info.Init(m_field, &infoCoefficients, e);
+  if (e != BCExceptionNO)
+    return;
+  std::unique_ptr<CBC_ReedSolomonGF256Poly> infoTemp(
+      info.MultiplyByMonomial(ecBytes, 1, e));
+  if (e != BCExceptionNO)
+    return;
+  std::unique_ptr<std::vector<CBC_ReedSolomonGF256Poly*>> temp(
+      infoTemp->Divide(generator, e));
+  if (e != BCExceptionNO)
+    return;
+  CBC_ReedSolomonGF256Poly* remainder = (*temp)[1];
+  std::vector<int32_t>* coefficients = remainder->GetCoefficients();
+  size_t numZeroCoefficients =
+      ecBytes > coefficients->size() ? ecBytes - coefficients->size() : 0;
+  for (size_t i = 0; i < numZeroCoefficients; i++)
+    (*toEncode)[dataBytes + i] = 0;
+  for (size_t y = 0; y < coefficients->size(); y++)
+    (*toEncode)[dataBytes + numZeroCoefficients + y] = (*coefficients)[y];
+  for (size_t k = 0; k < temp->size(); k++)
+    delete (*temp)[k];
+}
+
+CBC_ReedSolomonEncoder::~CBC_ReedSolomonEncoder() {
+  for (size_t i = 0; i < m_cachedGenerators.size(); i++)
+    delete m_cachedGenerators[i];
+}