/**
* @param s 需要编码的url字符串
* @param len 需要编码的url的长度
* @param new_length 编码后的url的长度
* @return char * 返回编码后的url
* @note 存储编码后的url存储在一个新审请的内存中,
* 用完后,调用者应该释放它
*/
char * urlencode(char const *s, int len, int *new_length)
{
printf( s);
printf("\n");
unsigned char const *from, *end;
from = s;
end = s + len;
start = to = (unsigned char *) malloc(3 * len + 1);
unsigned char hexchars[] = "0123456789ABCDEF";
while (from < end) {
c = *from++;
if (c == ' ') {
*to++ = '+';
} else if ((c < '0' && c != '-' && c != '.')
||(c < 'A' && c > '9')
||(c > 'Z' && c < 'a' && c != '_')
||(c > 'z')) {
to[0] = '%';
to[1] = hexchars[c >> 4];
to[2] = hexchars[c & 15];
to += 3;
} else {
*to++ = c;
}
}
*to = 0;
if (new_length) {
*new_length = to - start;
}
return (char *) start;
}
/**
* @param str 需要解码的url字符串
* @param len 需要解码的url的长度
* @return int 返回解码后的url长度
*/
int urldecode(char *str, int len)
{
char *dest = str;
char *data = str;
int value;
int c;
while (len--) {
if (*data == '+') {
*dest = ' ';
}
else if (*data == '%' && len >= 2 && isxdigit((int) *(data + 1))
&& isxdigit((int) *(data + 2)))
{
c = ((unsigned char *)(data+1))[0];
if (isupper(c))
c = tolower(c);
value = (c >= '0' && c <= '9' ? c - '0' : c - 'a' + 10) * 16;
c = ((unsigned char *)(data+1))[1];
if (isupper(c))
c = tolower(c);
value += c >= '0' && c <= '9' ? c - '0' : c - 'a' + 10;
*dest = (char)value ;
data += 2;
len -= 2;
} else {
*dest = *data;
}
data++;
dest++;
}
*dest = '\0';
return dest - str;
}
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