1 // Copyright 2017 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 CORE_FXCRT_CFX_BITSTREAM_H_ 8 #define CORE_FXCRT_CFX_BITSTREAM_H_ 9 10 #include <stdint.h> 11 12 #include "core/fxcrt/unowned_ptr.h" 13 14 class CFX_BitStream { 15 public: 16 CFX_BitStream(const uint8_t* pData, uint32_t dwSize); 17 ~CFX_BitStream(); 18 19 void ByteAlign(); 20 21 bool IsEOF() const { return m_BitPos >= m_BitSize; } 22 uint32_t GetPos() const { return m_BitPos; } 23 uint32_t GetBits(uint32_t nBits); 24 25 void SkipBits(uint32_t nBits) { m_BitPos += nBits; } 26 void Rewind() { m_BitPos = 0; } 27 28 uint32_t BitsRemaining() const { 29 return m_BitSize >= m_BitPos ? m_BitSize - m_BitPos : 0; 30 } 31 32 private: 33 uint32_t m_BitPos; 34 uint32_t m_BitSize; 35 UnownedPtr<const uint8_t> m_pData; 36 }; 37 38 #endif // CORE_FXCRT_CFX_BITSTREAM_H_ 39
