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// 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 = 0;
const uint32_t m_BitSize;
UnownedPtr<const uint8_t> const m_pData;
};
#endif // CORE_FXCRT_CFX_BITSTREAM_H_