char *
chxj_url_decode(apr_pool_t *pool, const char *src)
{
char *dst;
int len;
int ii;
int jj;
if (!src) return apr_pstrdup(pool, "\0");
len = strlen(src);
dst = apr_palloc(pool, len+1);
memset(dst, 0, len+1);
for (jj=0,ii=0; src[ii] != '\0' && ii < len; ii++) {
if (src[ii] == '%') {
if (ii + 2 <= len && IS_HEXCHAR(src[ii+1]) && IS_HEXCHAR(src[ii+2])) {
dst[jj++] = s_hex_value(src[ii+1]) * 16 + s_hex_value(src[ii+2]);
ii+=2;
}
}
else if (src[ii] == '+') {
dst[jj++] = ' ';
}
else {
dst[jj++] = src[ii];
}
}
return dst;
}
/*
* [RFC2554]
* DIGIT = %x30-39 ;; Digits 0-9
* HEXDIGIT = %x41-46 / DIGIT ;; hexidecimal digit (uppercase)
* hexchar = "+" HEXDIGIT HEXDIGIT
*/
static int
XParse_hexchar(const char *head, const char *tail, const char **nextp, XBuffer *xbuf)
{
if ((head + 2 < tail) && ('+' == *head) && IS_HEXCHAR(*(head + 1)) && IS_HEXCHAR(*(head + 2))) {
XBuffer_appendChar(xbuf, CHAR2HEX(*(head + 1)) * 0x10 + CHAR2HEX(*(head + 2)));
*nextp = head + 3;
return 3;
} else {
*nextp = head;
return 0;
} // end if
} // end function : XParse_hexchar
