1 // Copyright 2014 PDFium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com 6 7 #ifndef FXBARCODE_COMMON_REEDSOLOMON_BC_REEDSOLOMONGF256_H_ 8 #define FXBARCODE_COMMON_REEDSOLOMON_BC_REEDSOLOMONGF256_H_ 9 10 #include <memory> 11 12 #include "third_party/base/optional.h" 13 14 class CBC_ReedSolomonGF256Poly; 15 16 class CBC_ReedSolomonGF256 { 17 public: 18 explicit CBC_ReedSolomonGF256(int32_t primitive); 19 ~CBC_ReedSolomonGF256(); 20 GetZero()21 CBC_ReedSolomonGF256Poly* GetZero() const { return m_zero.get(); } GetOne()22 CBC_ReedSolomonGF256Poly* GetOne() const { return m_one.get(); } 23 24 std::unique_ptr<CBC_ReedSolomonGF256Poly> BuildMonomial(int32_t degree, 25 int32_t coefficient); 26 static int32_t AddOrSubtract(int32_t a, int32_t b); 27 int32_t Exp(int32_t a); 28 Optional<int32_t> Inverse(int32_t a); 29 int32_t Multiply(int32_t a, int32_t b); 30 void Init(); 31 32 private: 33 std::unique_ptr<CBC_ReedSolomonGF256Poly> m_zero; 34 std::unique_ptr<CBC_ReedSolomonGF256Poly> m_one; 35 int32_t m_expTable[256]; 36 int32_t m_logTable[256]; 37 }; 38 39 #endif // FXBARCODE_COMMON_REEDSOLOMON_BC_REEDSOLOMONGF256_H_ 40