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// Copyright 2014 The PDFium Authors
// 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_FXCODEC_JBIG2_JBIG2_BITSTREAM_H_
#define CORE_FXCODEC_JBIG2_JBIG2_BITSTREAM_H_
#include "core/fxcrt/retain_ptr.h"
#include "third_party/base/containers/span.h"
class CJBig2_BitStream {
public:
CJBig2_BitStream(pdfium::span<const uint8_t> pSrcStream, uint64_t key);
CJBig2_BitStream(const CJBig2_BitStream&) = delete;
CJBig2_BitStream& operator=(const CJBig2_BitStream&) = delete;
~CJBig2_BitStream();
// TODO(thestig): readFoo() should return bool.
int32_t readNBits(uint32_t dwBits, uint32_t* dwResult);
int32_t readNBits(uint32_t dwBits, int32_t* nResult);
int32_t read1Bit(uint32_t* dwResult);
int32_t read1Bit(bool* bResult);
int32_t read1Byte(uint8_t* cResult);
int32_t readInteger(uint32_t* dwResult);
int32_t readShortInteger(uint16_t* wResult);
void alignByte();
uint8_t getCurByte() const;
void incByteIdx();
uint8_t getCurByte_arith() const;
uint8_t getNextByte_arith() const;
uint32_t getOffset() const;
void setOffset(uint32_t dwOffset);
uint32_t getBitPos() const;
void setBitPos(uint32_t dwBitPos);
const uint8_t* getBuf() const;
uint32_t getLength() const;
const uint8_t* getPointer() const;
void offset(uint32_t dwOffset);
uint32_t getByteLeft() const;
uint64_t getKey() const { return m_Key; }
bool IsInBounds() const;
private:
void AdvanceBit();
uint32_t LengthInBits() const;
const pdfium::span<const uint8_t> m_Span;
uint32_t m_dwByteIdx = 0;
uint32_t m_dwBitIdx = 0;
const uint64_t m_Key;
};
#endif // CORE_FXCODEC_JBIG2_JBIG2_BITSTREAM_H_
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