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// Copyright 2014 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 _JBIG2_BIT_STREAM_H_
#define _JBIG2_BIT_STREAM_H_
#include "JBig2_Define.h"
class CJBig2_BitStream : public CJBig2_Object
{
public:
CJBig2_BitStream(uint8_t *pBuffer, FX_DWORD dwLength);
CJBig2_BitStream(CJBig2_BitStream &bs);
~CJBig2_BitStream();
int32_t readNBits(FX_DWORD nBits, FX_DWORD *dwResult);
int32_t readNBits(FX_DWORD nBits, int32_t *nResult);
int32_t read1Bit(FX_DWORD *dwResult);
int32_t read1Bit(FX_BOOL *bResult);
int32_t read1Byte(uint8_t *cResult);
int32_t readInteger(FX_DWORD *dwResult);
int32_t readShortInteger(FX_WORD *wResult);
void alignByte();
void align4Byte();
uint8_t getAt(FX_DWORD dwOffset);
uint8_t getCurByte();
uint8_t getNextByte();
int32_t incByteIdx();
uint8_t getCurByte_arith();
uint8_t getNextByte_arith();
FX_DWORD getOffset();
void setOffset(FX_DWORD dwOffset);
FX_DWORD getBitPos();
void setBitPos(FX_DWORD dwBitPos);
uint8_t *getBuf();
FX_DWORD getLength()
{
return m_dwLength;
}
uint8_t *getPointer();
void offset(FX_DWORD dwOffset);
FX_DWORD getByteLeft();
private:
uint8_t *m_pBuf;
FX_DWORD m_dwLength;
FX_DWORD m_dwByteIdx;
FX_DWORD m_dwBitIdx;
};
inline CJBig2_BitStream::CJBig2_BitStream(uint8_t *pBuffer, FX_DWORD dwLength)
{
m_pBuf = pBuffer;
m_dwLength = dwLength;
m_dwByteIdx = 0;
m_dwBitIdx = 0;
if (m_dwLength > 256 * 1024 * 1024) {
m_dwLength = 0;
m_pBuf = NULL;
}
}
inline CJBig2_BitStream::CJBig2_BitStream(CJBig2_BitStream &bs)
{
m_pBuf = bs.m_pBuf;
m_dwLength = bs.m_dwLength;
m_dwByteIdx = bs.m_dwByteIdx;
m_dwBitIdx = bs.m_dwBitIdx;
}
inline CJBig2_BitStream::~CJBig2_BitStream()
{
}
inline int32_t CJBig2_BitStream::readNBits(FX_DWORD dwBits, FX_DWORD *dwResult)
{
FX_DWORD dwTemp = (m_dwByteIdx << 3) + m_dwBitIdx;
if(dwTemp <= (m_dwLength << 3)) {
*dwResult = 0;
if(dwTemp + dwBits <= (m_dwLength << 3)) {
dwTemp = dwBits;
} else {
dwTemp = (m_dwLength << 3) - dwTemp;
}
while(dwTemp > 0) {
*dwResult = (*dwResult << 1) | ((m_pBuf[m_dwByteIdx] >> (7 - m_dwBitIdx)) & 0x01);
if(m_dwBitIdx == 7) {
m_dwByteIdx ++;
m_dwBitIdx = 0;
} else {
m_dwBitIdx ++;
}
dwTemp --;
}
return 0;
} else {
return -1;
}
}
inline int32_t CJBig2_BitStream::readNBits(FX_DWORD dwBits, int32_t *nResult)
{
FX_DWORD dwTemp = (m_dwByteIdx << 3) + m_dwBitIdx;
if(dwTemp <= (m_dwLength << 3)) {
*nResult = 0;
if(dwTemp + dwBits <= (m_dwLength << 3)) {
dwTemp = dwBits;
} else {
dwTemp = (m_dwLength << 3) - dwTemp;
}
while(dwTemp > 0) {
*nResult = (*nResult << 1) | ((m_pBuf[m_dwByteIdx] >> (7 - m_dwBitIdx)) & 0x01);
if(m_dwBitIdx == 7) {
m_dwByteIdx ++;
m_dwBitIdx = 0;
} else {
m_dwBitIdx ++;
}
dwTemp --;
}
return 0;
} else {
return -1;
}
}
inline int32_t CJBig2_BitStream::read1Bit(FX_DWORD *dwResult)
{
if(m_dwByteIdx < m_dwLength) {
*dwResult = (m_pBuf[m_dwByteIdx] >> (7 - m_dwBitIdx)) & 0x01;
if(m_dwBitIdx == 7) {
m_dwByteIdx ++;
m_dwBitIdx = 0;
} else {
m_dwBitIdx ++;
}
return 0;
} else {
return -1;
}
}
inline int32_t CJBig2_BitStream::read1Bit(FX_BOOL *bResult)
{
if(m_dwByteIdx < m_dwLength) {
*bResult = (m_pBuf[m_dwByteIdx] >> (7 - m_dwBitIdx)) & 0x01;
if(m_dwBitIdx == 7) {
m_dwByteIdx ++;
m_dwBitIdx = 0;
} else {
m_dwBitIdx ++;
}
return 0;
} else {
return -1;
}
}
inline int32_t CJBig2_BitStream::read1Byte(uint8_t *cResult)
{
if(m_dwByteIdx < m_dwLength) {
*cResult = m_pBuf[m_dwByteIdx];
m_dwByteIdx ++;
return 0;
} else {
return -1;
}
}
inline int32_t CJBig2_BitStream::readInteger(FX_DWORD *dwResult)
{
if(m_dwByteIdx + 3 < m_dwLength) {
*dwResult = (m_pBuf[m_dwByteIdx] << 24) | (m_pBuf[m_dwByteIdx + 1] << 16)
| (m_pBuf[m_dwByteIdx + 2] << 8) | m_pBuf[m_dwByteIdx + 3];
m_dwByteIdx += 4;
return 0;
} else {
return -1;
}
}
inline int32_t CJBig2_BitStream::readShortInteger(FX_WORD *dwResult)
{
if(m_dwByteIdx + 1 < m_dwLength) {
*dwResult = (m_pBuf[m_dwByteIdx] << 8) | m_pBuf[m_dwByteIdx + 1];
m_dwByteIdx += 2;
return 0;
} else {
return -1;
}
}
inline void CJBig2_BitStream::alignByte()
{
if(m_dwBitIdx != 0) {
m_dwByteIdx ++;
m_dwBitIdx = 0;
}
}
inline void CJBig2_BitStream::align4Byte()
{
if(m_dwBitIdx != 0) {
m_dwByteIdx ++;
m_dwBitIdx = 0;
}
m_dwByteIdx = (m_dwByteIdx + 3) & -4;
}
inline uint8_t CJBig2_BitStream::getAt(FX_DWORD dwOffset)
{
if(dwOffset < m_dwLength) {
return m_pBuf[dwOffset];
} else {
return 0;
}
}
inline uint8_t CJBig2_BitStream::getCurByte()
{
if(m_dwByteIdx < m_dwLength) {
return m_pBuf[m_dwByteIdx];
} else {
return 0;
}
}
inline uint8_t CJBig2_BitStream::getNextByte()
{
if(m_dwByteIdx + 1 < m_dwLength) {
return m_pBuf[m_dwByteIdx + 1];
} else {
return 0;
}
}
inline int32_t CJBig2_BitStream::incByteIdx()
{
if(m_dwByteIdx < m_dwLength) {
m_dwByteIdx ++;
return 0;
} else {
return -1;
}
}
inline uint8_t CJBig2_BitStream::getCurByte_arith()
{
if(m_dwByteIdx < m_dwLength) {
return m_pBuf[m_dwByteIdx];
} else {
return 0xff;
}
}
inline uint8_t CJBig2_BitStream::getNextByte_arith()
{
if(m_dwByteIdx + 1 < m_dwLength) {
return m_pBuf[m_dwByteIdx + 1];
} else {
return 0xff;
}
}
inline FX_DWORD CJBig2_BitStream::getOffset()
{
return m_dwByteIdx;
}
inline void CJBig2_BitStream::setOffset(FX_DWORD dwOffset)
{
if (dwOffset > m_dwLength) {
dwOffset = m_dwLength;
}
m_dwByteIdx = dwOffset;
}
inline FX_DWORD CJBig2_BitStream::getBitPos()
{
return (m_dwByteIdx << 3) + m_dwBitIdx;
}
inline void CJBig2_BitStream::setBitPos(FX_DWORD dwBitPos)
{
m_dwByteIdx = dwBitPos >> 3;
m_dwBitIdx = dwBitPos & 7;
}
inline uint8_t *CJBig2_BitStream::getBuf()
{
return m_pBuf;
}
inline uint8_t *CJBig2_BitStream::getPointer()
{
return m_pBuf + m_dwByteIdx;
}
inline void CJBig2_BitStream::offset(FX_DWORD dwOffset)
{
m_dwByteIdx += dwOffset;
}
inline FX_DWORD CJBig2_BitStream::getByteLeft()
{
return m_dwLength - m_dwByteIdx;
}
#endif
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