将16进制文本转换为ascii码的C语言代码

我用的将16进制文本转换为ascii码的C语言代码。16进制文本复制到文件test.txt中，运行程序，将得到输入。

 

例：

运行：./CSTRING test.txt

 

其中，test.txt文件内容为：

30:31:32

 

则得到的"Cstring.txt"输入文件中

 012

 

本程序能自动跳过0或多个分隔符（分隔符可以为任意的符号，如“：”，“%”或空格等，判断的函数实现见SkipDelimiter函数）。

如：输入文件内容为：

30     31            32

或

303132

得到的都是

012

 

#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <libgen.h>
#include <fcntl.h>
#include <stdlib.h>

typedef unsigned char uint8;

uint8 ConverseOneChar(uint8 ucChar)
{
	uint8 ucTmp = 0x00;
	printf("one ucChar= 0x%x\n", (char)ucChar);
	switch(ucChar)
	{
	case '0':
		ucTmp = 0x00;
		break;
	case '1':
		ucTmp = 0x01;
		break;
	case '2':
		ucTmp = 0x02;
		break;
	case '3':
		ucTmp = 0x03;
		break;
	case '4':
		ucTmp = 0x04;
		break;
	case '5':
		ucTmp = 0x05;
		break;
	case '6':
		ucTmp = 0x06;
		break;
	case '7':
		ucTmp = 0x07;
		break;
	case '8':
		ucTmp = 0x08;
		break;
	case '9':
		ucTmp = 0x09;
		break;
	case 'a':
	case 'A':
		ucTmp = 0x0a;
		break;
	case 'b':
	case 'B':
		ucTmp = 0x0b;
		break;
	case 'c':
	case 'C':
		ucTmp = 0x0c;
		break;
	case 'd':
	case 'D':
		ucTmp = 0x0d;
		break;
	case 'e':
	case 'E':
		ucTmp = 0x0e;
		break;
	case 'f':
	case 'F':
		ucTmp = 0x0f;
		break;
	default:
		printf("err char!\n");
		return -1;
	}
	return ucTmp;
}

uint8 GetOneChar(uint8 *pucBuf)
{
	uint8 ucChar = 0x00;
	if(NULL == pucBuf)
	{
		printf("para is NULL!\n");
		return -1;
	}

	ucChar = ConverseOneChar(pucBuf[0]);
	printf("first ucChar= 0x%x\n", (char)ucChar);
	ucChar <<= 4;
	ucChar |= ConverseOneChar(pucBuf[1]);
	printf("second ucChar= %c[0x%x]\n", (char)ucChar, ucChar);

	return ucChar;
}

int SkipDelimiter(uint8 *pcBuf)
{
    int n = 0;
    char *pcBufTmp = (char *)pcBuf;
    
    for(n = 0; (pcBufTmp[n] != '\0') && (pcBufTmp[n] != '\n') && (pcBufTmp[n] != '\r'); n++)
    {
        if ((pcBufTmp[n] == '0')
            || (pcBufTmp[n] == '1')
            || (pcBufTmp[n] == '2')
            || (pcBufTmp[n] == '3')
            || (pcBufTmp[n] == '4')
            || (pcBufTmp[n] == '5')
            || (pcBufTmp[n] == '6')
            || (pcBufTmp[n] == '7')
            || (pcBufTmp[n] == '8')
            || (pcBufTmp[n] == '9')
            || (pcBufTmp[n] == 'A') || (pcBufTmp[n] == 'a')
            || (pcBufTmp[n] == 'B') || (pcBufTmp[n] == 'b')
            || (pcBufTmp[n] == 'C') || (pcBufTmp[n] == 'c')
            || (pcBufTmp[n] == 'D') || (pcBufTmp[n] == 'd')
            || (pcBufTmp[n] == 'E') || (pcBufTmp[n] == 'e')
            || (pcBufTmp[n] == 'F') || (pcBufTmp[n] == 'f'))
        {
            break;
        }
    }

    return n;
}

int ParseHexString(unsigned char *pucSrcBuf, int iSrcFileLen, unsigned char *pucDstBuf)
{
	uint8 *pucSrcTmp = NULL;
	uint8 *pucDstTmp = NULL;
	uint8 ucTmp = 0;
	int iFileLenRemain = iSrcFileLen;
	int iDelimiterNum = 0;
	int n = 0;

	if((NULL == pucSrcBuf)||(NULL == pucSrcBuf))
	{
		printf("para 1 or 2 is NULL!\n");
		return -1;
	}
	pucSrcTmp = pucSrcBuf;
	pucDstTmp = pucDstBuf;


	while(iFileLenRemain != 0)
	{
		ucTmp = GetOneChar(pucSrcTmp);
		printf("ucTmp = %c\n", (char)ucTmp);
		pucDstTmp[n++] = ucTmp;

		pucSrcTmp += 2;
        iDelimiterNum = SkipDelimiter(pucSrcTmp);
        printf("iDelimiterNum=%d\n", iDelimiterNum);
		pucSrcTmp += iDelimiterNum;
		iFileLenRemain -= 2 + iDelimiterNum;
	}

	return n;
}

int main(int argc, char **argv)
{
	int iRet = 0;
	char *pcFileForChange = NULL;
	int iSrcFd = 0;
	int iDstFd = 0;
	int iSrcFileLen = 0;
	int n = 0;
	unsigned char *pucSrcBuf = NULL;
	unsigned char *pucDstBuf = NULL;

	if(argc != 2)
	{
		printf("you need input the filename to change!\n");
		return -1;
	}

	pcFileForChange = argv[1];
	printf("filename:%s\n", pcFileForChange);
	iSrcFd = open(pcFileForChange, O_RDONLY);
	if (iSrcFd < 0)
	{
		printf("open file:[%s] faild!\n", pcFileForChange);
		return -1;
	}
	iDstFd = open("Cstring.txt", O_RDWR | O_CREAT | O_TRUNC, 0644);
	if (iDstFd < 0)
	{
		printf("open change filename file faild!\n");
		return -1;
	}

	iSrcFileLen = lseek(iSrcFd, 0, SEEK_END);
	printf("FileLen:%d\n", iSrcFileLen);
	lseek(iSrcFd, 0, SEEK_SET);
	pucSrcBuf = malloc(iSrcFileLen + 1024);
	pucDstBuf = malloc(iSrcFileLen);
	memset(pucSrcBuf, 0, iSrcFileLen);
	memset(pucDstBuf, 0, iSrcFileLen);

	iRet = read(iSrcFd, pucSrcBuf, iSrcFileLen);
	if(iRet != iSrcFileLen)
	{
		printf("read err, read len = %d\n", iRet);
		return -1;
	}
	printf("read:%s\n", pucSrcBuf);

	n = ParseHexString(pucSrcBuf, iSrcFileLen, pucDstBuf);
	printf("write:\n%s\n", pucDstBuf);

	iRet = write(iDstFd, pucDstBuf, n);
	if(iRet != n)
	{
		printf("write err, write len = %d\n", iRet);
		return -1;
	}

	close(iSrcFd);
	close(iDstFd);


	return 0;
}