Hex与ASCII相互转换函数

最新推荐文章于 2023-01-17 09:21:36 发布

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本文介绍了如何将十六进制数据转换为ASCII字符串，并提供了从ASCII字符串解析回十六进制数据的方法。通过两个函数HexGroupToString和StringToHexGroup实现了这一功能。

http://blog.youkuaiyun.com/surelion/article/details/7926116

char HexToASCII(unsigned char data_hex)
{
char ASCII_Data;
ASCII_Data=data_hex & 0x0F;
if(ASCII_Data<10)
  ASCII_Data=ASCII_Data+0x30; //‘0--9’
else
  ASCII_Data=ASCII_Data+0x37;       //‘A--F’
return ASCII_Data;
}

void HexGroupToString(char *OutStrBuffer, unsigned char *InHexBuffer, unsigned int HexLength)
{
unsigned int i, k=0;
for(i=0;i<HexLength;i++)
{
OutStrBuffer[k++]=HexToASCII((InHexBuffer[i]>>4)&0x0F);
OutStrBuffer[k++]=HexToASCII(InHexBuffer[i]&0x0F);
}
OutStrBuffer[k]='\0';
}

BOOL StringToHexGroup(unsigned char *OutHexBuffer, char *InStrBuffer, unsigned int strLength)
{
unsigned int i, k=0;
unsigned char HByte,LByte;
if(strLength%2 !=0)
  return FALSE;

for(i=0; i<strLength; i=i+2)
{
  if(InStrBuffer[i]>='0' && InStrBuffer[i]<='9')
  {
   HByte=InStrBuffer[i]-'0';
  }
  else if(InStrBuffer[i]>='A' && InStrBuffer[i]<='F')
  {
   HByte=InStrBuffer[i]-'A' +10;
  }
  else
  {
   HByte=InStrBuffer[i];
   return FALSE;
  }
  HByte=HByte <<4;
  HByte = HByte & 0xF0;
  if(InStrBuffer[i+1]>='0' && InStrBuffer[i+1]<='9')
  {
   LByte=InStrBuffer[i+1]-'0';
  }
  else if(InStrBuffer[i+1]>='A' && InStrBuffer[i+1]<='F')
  {
   LByte=InStrBuffer[i+1]-'A' +10;
  }
  else
  {
   LByte=InStrBuffer[i];
   return FALSE;
  }
  OutHexBuffer[k++]=HByte |LByte;
}
return TRUE;
}