c语言进行urlencode编码,利用C语言进行urldecode，解决浏览器中的urlencode

利用C语言进行urldecode，解决浏览器中的urlencode

#include

#include

#include

int isDigit(unsigned char ch)

{

if(ch>= '0' && ch <= '9')

{

return 1;

}

else

{

return 0;

}

}

unsigned char character_to_hex(unsigned char highByte, unsigned char lowByte)

{

highByte = isDigit(highByte)? (highByte - '0'):(highByte - 'A' + 10);

lowByte = isDigit(lowByte)? (lowByte - '0'):(lowByte - 'A' + 10);

return ((highByte<<4) + lowByte);

}

unsigned char* urldecode(unsigned char* srcBuf, int srcLen, int *outLen)

{

if(NULL == srcBuf || srcLen<= 0)

{

return NULL;

}

unsigned char* dstBuf = NULL;

dstBuf = (unsigned char *)malloc(srcLen);

if(NULL == dstBuf)

{

return NULL;

}

int i=0, j=0;

for(i=0; i

{

if(srcBuf[i] == '%')

{

dstBuf[j] = character_to_hex(srcBuf[i+1], srcBuf[i+2]);

i+=2;

}

else if(srcBuf[i] == '+')

{

dstBuf[j] = ' ';

}

else

{

dstBuf[j] = srcBuf[i];

}

j++;

}

*outLen = j;

return dstBuf;

}

int main(int argc, char *argv[])

{

if(argc != 2)

{

printf("few paramter...\n");

printf("Usage: ./urldecode szURL\n");

return -1;

}

int size = 0;

unsigned char* dst = urldecode(argv[1], strlen(argv[1]), &size);

printf("%s\n", dst);

return 0;

}