출처 : http://hi.blog.qrobo.com/?p=71
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <signal.h>
#include <errno.h>
#include <fcntl.h>
int urldecode(unsigned char *source, unsigned char *dest)
{
int num=0, i, hexv, index=0;
int retval=0;
while(*source) {
if (*source == ‘%’) {
num = 0;
retval = 0;
for (i = 0; i < 2; i++) {
*source++;
if (*(source) < ‘:’) {
num = *(source) ? 48;
}
else if (*(source) > ‘@’ && *(source) < ‘[') {
num = (*(source) - 'A')+10;
}
else {
num = (*(source) - 'a')+10;
}
if ((16*(1-i))) {
num = (num*16);
}
retval += num;
}
dest[index] = retval;
index++;
}
else {
dest[index] = *source;
index++;
}
*source++;
}
return index;
}
int urlencode(unsigned char *source, unsigned char *dest)
{
unsigned char hex[4];
unsigned char *sbuf;
int size = 0;
sbuf = dest;
while(*source) {
if ((*source > 47 && *source < 57) ||
(*source > 64 && *source < 92) ||
(*source > 96 && *source < 123) ||
*source == ‘-’ ||
*source == ‘.’ ||
*source == ‘_’) {
*sbuf = *source;
}
else {
sprintf(hex, “%%%02X”, *source);
strncat(sbuf, hex,3);
*sbuf++;
*sbuf++;
size += 2;
}
*source++;
*sbuf++;
size++;
}
return size;
}
int main(void)
{
int n;
unsigned char test[256] = {0×00,};
unsigned char* str =”%B3%C3%C0%E5%B0%ED”;
n = urldecode(str, test);
printf(“encode : %d %s\n”, n, test);
return 0;
}
