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HDLCCodec.h
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HDLCCodec.h
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/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*
+ HDLCCodec.h +
+ -------------------------------------------------------- +
+ +
+摘要: HDLC(High level Data Link Control的声明 +
+作者: Sharper Huang +
+创建: 2011-7-14 0:31:51 +
+ (C) Hangzhou Synway software., ltd +
*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
#ifndef __HDCLCODEC_H__
#define __HDCLCODEC_H__
#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
#define MIN_FRAME_BUFFER 16
#define DEF_FRAME_BUFFER 256
#define MAX_FRAME_BUFFER 4096
//#define HDLC_FRAME_END 0 //文件结束
#define HDLC_FRAME_DATA 1 //数据帧
#define HDLC_FRAME_ABORT 2 //异常帧
#define HDLC_FRAME_DONE 3
#define HDLC_FRAME_MAXBYTES 2048
extern unsigned char C_BYTEINVERSE_MAP[256]; //BIG-ENDIAN <==>LITTLE-ENDIAN
unsigned short int ComputeFCS (const unsigned char *szData, int nLen);
bool CheckFCS (const unsigned char *szData, int nLen);
//-------------------------------------------------------------
//解码类
//-------------------------------------------------------------
//回调函数，当一帧数据解码完成后，调用此函数
typedef void (__stdcall *ONFRAMEDECODED)(int nType,const char* szFrame,int nLen,void* pUser);
class CHDLCDecode
{
public:
CHDLCDecode();
virtual ~CHDLCDecode();
public:
void StartDecode(ONFRAMEDECODED pfCB,unsigned short wBufferSize,void* pUserData);
int DecodeBuffer(const char* pData,int nSize);
private:
inline void OnFrameFlagByte(int nOffset);
inline void OnFrameAbort();
inline void AddBit(unsigned char ucBit);
inline int OnByteDecoded(unsigned char ucByte);
void ResetDecode(unsigned int dwBufSize=HDLC_FRAME_MAXBYTES);
private:
unsigned int m_nDecodedBytes;
unsigned int m_nBlockSize;
unsigned char* m_pszDecodedBuf;
unsigned char m_ucDecodingByte;
unsigned char m_nHighLevelBits;
bool m_bFlagByte;
unsigned int m_nOffsetInStream;
unsigned char m_nDecodedBits;
ONFRAMEDECODED m_pfCB;
void* m_pUserData;
};
//-------------------------------------------------------------
//编码类
//-------------------------------------------------------------
typedef void (__stdcall *ONFRAMEENCODED)(int nType,const char* szBuffer,int nLen,void* pUser);
class CHDLCEncode
{
public:
CHDLCEncode();
virtual ~CHDLCEncode();
//public:
// void __stdcall CBBlockEncoded(int nType,const char* szBuffer,int nLen,void* pUser);
public:
unsigned int EncodeFrame( const char *szRaw,
unsigned int dwRawSize,
char* szEncodedBuffer,
unsigned int dwBufferSize);
unsigned char GetFlagByte() const { return m_ucFlagByte;}
unsigned char GetFlagByteInverse() const ;
int EncodeFrameStream(int nType,const char* szBuffer,unsigned int dwLen);
void SetPlaybackBaudRate(unsigned int nBaudRate);
void StartEncode(ONFRAMEENCODED pfCB,
unsigned short wMaxFrameSize,
void* pUserData);
private:
inline void InsertFlagByte(bool bFrameDone=false);
__forceinline void EncodeByte(unsigned char ucTemp);
inline void AddBit(unsigned char ucBit);
inline void ResetEncode(unsigned int dwBufSize);
inline void OnByteEncoded(unsigned char ucByte);
inline void OnFrameEncoded();
private:
unsigned int m_nBytesPerSec;
bool m_bFlagByteInserted;
ONFRAMEENCODED m_pfCB;
unsigned char m_ucFlagByte; //标志位
void* m_pUserData;
unsigned int m_nBlockSize;
unsigned int m_nEncodedBytes; //已编码的字节数
unsigned char* m_pszStreamEncodedBuf; //已编码的字节缓存
unsigned char m_nHighLevelBits; //连续高电平（BIT 1)位数
unsigned char m_ucEncodingByte; //正在编码的字节
unsigned char m_nEncodedBits; //已编码的位（BIT)数
//unsigned char*
unsigned char* m_psResultBuf; //已编码的字节缓存
unsigned int m_nResultBufSize; //已编码的字节缓存
unsigned int m_nResultBufPtr; //已编码的字节缓存
};
#endif //__HDCLCODEC_H__