| // Copyright 2017 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 |
| |
| #ifndef CORE_FXCRT_CFX_BITSTREAM_H_ |
| #define CORE_FXCRT_CFX_BITSTREAM_H_ |
| |
| #include <stdint.h> |
| |
| #include "core/fxcrt/unowned_ptr.h" |
| #include "third_party/base/span.h" |
| |
| class CFX_BitStream { |
| public: |
| explicit CFX_BitStream(pdfium::span<const uint8_t> pData); |
| ~CFX_BitStream(); |
| |
| void ByteAlign(); |
| |
| bool IsEOF() const { return m_BitPos >= m_BitSize; } |
| uint32_t GetPos() const { return m_BitPos; } |
| uint32_t GetBits(uint32_t nBits); |
| |
| void SkipBits(uint32_t nBits) { m_BitPos += nBits; } |
| void Rewind() { m_BitPos = 0; } |
| |
| uint32_t BitsRemaining() const { |
| return m_BitSize >= m_BitPos ? m_BitSize - m_BitPos : 0; |
| } |
| |
| private: |
| uint32_t m_BitPos; |
| uint32_t m_BitSize; |
| UnownedPtr<const uint8_t> m_pData; |
| }; |
| |
| #endif // CORE_FXCRT_CFX_BITSTREAM_H_ |