//========================================================================
//TITLE:
// S-Record格式分析代碼
//AUTHOR:
// norains
//DATE:
// Wednesday 30-April-2008
//Environment:
// NULL
//========================================================================
MOTOROLA S-Record的格式并不複雜，相關的描述可以參考我另一篇文章《S-Record格式詳解》：http://blog.csdn.net/norains/archive/2008/04/25/2326306.aspx。本文主要是在代碼層次對S-Record進行分析。
和以往相同，為了友善使用，将S-Record的分析代碼封裝為一個CSrecParse類。
以下為CSrecParse類代碼：
//
// SrecParse.h: interface for the CSrecParse class.
//
//
#pragma once
#include <string>
#include <vector>
#ifdef UNICODE
typedef std::wstring TSTRING;
#else
typedef std::string TSTRING;
#endif
class CSrecParse
{
public:
enum Type
{
S0 = 0,
S1,
S2,
S3,
S4,
S5,
S6,
S7,
S8,
S9
};
public:
//Interface
bool SetFile(const TSTRING & strFile);
bool GetNextData(CSrecParse::Type &type, DWORD &dwAddr,std::vector<BYTE> &vctData, bool &bChkSum);
public:
CSrecParse(void);
~CSrecParse(void);
void Reset(void);
protected:
DWORD HexToDec(const char *pChar,int iLen = -1);
private:
std::string::size_type m_stPos;
std::string m_strContent;
};
//
// SrecParse.cpp
//
//
#include "stdafx.h"
#include "SrecParse.h"
CSrecParse::CSrecParse(void):
m_stPos(0)
{
}
CSrecParse::~CSrecParse(void)
{
}
//----------------------------------------------------------
//Description:
// Set the S-Record file to parse
//
//----------------------------------------------------------
bool CSrecParse::SetFile(const TSTRING & strFile)
{
HANDLE hFile = CreateFile(&strFile[0],GENERIC_READ,NULL,NULL,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,NULL);
if(INVALID_HANDLE_VALUE == hFile)
{
return false;
}
DWORD dwFileSize = GetFileSize(hFile,NULL);
if(m_strContent.capacity() < dwFileSize)
{
m_strContent.resize(dwFileSize);
}
DWORD dwFileRead = 0;
ReadFile(hFile,&m_strContent[0],dwFileSize,&dwFileRead,NULL);
CloseHandle(hFile);
return true;
}
//----------------------------------------------------------
//Description:
// Get the next data. If you want to get the first data,you should call Reset() before calling the function.
//
//Parameter:
// type : [out] The data type
// dwAddr : [out] The address
// vctData : [out] The buffer for store the data.
// bChkSum : [out] The checksum is right or not.
//
//----------------------------------------------------------
bool CSrecParse::GetNextData(CSrecParse::Type &type, DWORD &dwAddr,std::vector<BYTE> &vctData, bool &bChkSum)
{
m_stPos = m_strContent.find("S",m_stPos);
if(m_stPos != std::string.npos)
{
std::string strCvrt(10,0);
std::vector<BYTE> vctStore;
DWORD dwSum = 0;
//The type
strCvrt[0] = m_strContent[m_stPos + 1];
strCvrt[1] = '/0';
type = static_cast<CSrecParse::Type>(atoi(&strCvrt[0]));
if(type == S5)
{
//Doesn't support the S5 type in current
return false;
}
//The length, include <address>,<data>,<checksum> field;
strCvrt[0] = m_strContent[m_stPos + 2];
strCvrt[1] = m_strContent[m_stPos + 3];
strCvrt[2] = '/0';
int iLength = static_cast<int>(HexToDec(&strCvrt[0])) * 2; //Plus 2 to convert to the string length.
dwSum += static_cast<int>(HexToDec(&strCvrt[0]));
if(type == S0)
{
//Address
dwAddr = 0;
//The data
for(int i = 0; i < iLength - 6; i += 2)
{
strCvrt[0] = m_strContent[m_stPos + 8 + i];
strCvrt[1] = m_strContent[m_stPos + 9 + i];
strCvrt[2] = '/0';
BYTE uData = static_cast<BYTE>(HexToDec(&strCvrt[0]));
vctStore.push_back(uData);
dwSum += uData;
}
vctData = vctStore;
//The checksum
strCvrt[0] = m_strContent[m_stPos + iLength + 2];
strCvrt[1] = m_strContent[m_stPos + iLength + 3];
strCvrt[2] = '/0';
bChkSum = (static_cast<BYTE>(HexToDec(&strCvrt[0])) == ( 0xFF - (dwSum & 0xFF)));
m_stPos ++;
return true;
}
else
{
//S1,S2,S3,S7,S8,S9
//The address
int iLenAddr = 0;
switch(type)
{
case S1:
case S9:
iLenAddr = 2 * 2;//Plus 2 to convert to the string length.
break;
case S2:
case S8:
iLenAddr = 3 * 2;//Plus 2 to convert to the string length.
break;
case S3:
case S7:
iLenAddr = 4 * 2;//Plus 2 to convert to the string length.
break;
}
for(int i = 0; i < iLenAddr; i++)
{
strCvrt[i] = m_strContent[m_stPos + 4 + i];
}
strCvrt[iLenAddr] = '/0';
dwAddr = HexToDec(&strCvrt[0]);
for(int i = 0; i < iLenAddr; i += 2)
{
dwSum += HexToDec(&strCvrt[i],2);
}
//The data
int iCount = iLength - iLenAddr - 2; //The length of 2 is checksum.
std::string::size_type stPosBegin = m_stPos + 3 + iLenAddr + 1;
for(int i = 0; i < iCount; i += 2)
{
strCvrt[0] = m_strContent[stPosBegin + i];
strCvrt[1] = m_strContent[stPosBegin + i + 1];
strCvrt[2] = '/0';
BYTE uData = static_cast<BYTE>(HexToDec(&strCvrt[0]));
vctStore.push_back(uData);
dwSum += uData;
}
vctData = vctStore;
//The checksum.
strCvrt[0] = m_strContent[m_stPos + iLength + 2];
strCvrt[1] = m_strContent[m_stPos + iLength + 3];
strCvrt[2] = '/0';
bChkSum = (static_cast<BYTE>(HexToDec(&strCvrt[0])) == ( 0xFF - (dwSum & 0xFF)));
}
}
else
{
return false;
}
m_stPos ++;
return true;
}
//----------------------------------------------------------
//Description:
// Reset the indext to call GetNextData() to get the first data.
//
//----------------------------------------------------------
void CSrecParse::Reset(void)
{
m_stPos = 0;
}
//----------------------------------------------------------
//Description:
// Hex convert to decade.
//
//Parameter:
// pChar : [in] The string to convert. If iLen is -1,it must be with the NULL terminate end.
// iLen : [in] The length of the pChar buffer. The default value is -1;
//
//----------------------------------------------------------
DWORD CSrecParse::HexToDec(const char *pChar,int iLen)
{
DWORD val = 0;
int iCount = 0;
while(*pChar)
{
if(*pChar >= 'a' && *pChar <= 'f')
{
val = val * 16 + *pChar - 'a' + 10;
}
else if(*pChar >= 'A' && *pChar <= 'F')
{
val = val * 16 + *pChar - 'A' + 10;
}
else if(*pChar >= '0' && *pChar <= '9')
{
val = val * 16 + *pChar - '0';
}
else
{
break;
}
pChar++;
if(iLen != -1)
{
iCount ++;
if(iCount >= iLen)
{
return val;
}
}
}
return val;
}
該類的使用非常簡單，現在以一個很基本的代碼作為示例：
CSrecParse parse;
//設定需要分析的檔案路徑
parse.SetFile(&strFile[0]);
//資料的類型
CSrecParse::Type type;
//資料的位址
DWORD dwAddr;
//存儲資料的緩存
std::vector<BYTE> vctData;
//ChkSum位是否正确
bool bChkSum;
std::vector<BYTE> vctStore;
while(parse.GetNextData(type,dwAddr,vctData,bChkSum) == true)
{
if(type == CSrecParse::S5)
{
//S5格式暫時不支援
break;
}
else
{
//...
//根據分析回來的資料去做相應處理
}
}
本文來自CSDN部落格，轉載請标明出處：http://blog.csdn.net/norains/archive/2008/04/30/2349903.aspx
![處理PCX檔案[圖]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)