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#include "urlenc.h"
#include "inner_tools.h"
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Local Shortcuts
*/
/* Call only if is_hex(c). */
static int from_hex(char c)
{
if (isdigit(c)) {
return c - '0';
} else {
return toupper(c) - 'A' + 10;
}
}
/* Call only if 0 <= num && num <= 15. */
static char to_hex(int num)
{
static const char * const hex = "0123456789ABCDEF";
return hex[num];
}
static int is_hex(char c)
{
return isdigit(c) || strchr("ABCDEF", toupper(c));
}
static int is_url(char c)
{
return isalnum(c) || strchr("$-_.+ !*'(),", c);
}
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* URL Decoding
*/
static int deurl(char ** data)
{
char * val = *data;
int ti;
int ci;
if (!val) {
*data = malloc(1);
**data = 0;
return 1;
}
for (ti = 0, ci = 0; val[ci]; ++ti, ++ci) {
if (val[ci] == '%') {
if (is_hex(val[ci + 1]) && is_hex(val[ci + 2])) {
/* Since chars can be signed, arithmetics are not safe. */
val[ti] = from_hex(val[ci + 2]); /* 0000xxxx */
val[ti] |= from_hex(val[ci + 1]) << 4; /* XXXXxxxx */
ci += 2; /* Two extra characters are readed from code. */
} else {
return 0;
}
} else if (val[ci] == '+') {
val[ti] = ' ';
} else {
val[ti] = val[ci];
}
}
val[ti] = 0;
return 1;
}
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Urlencoded Automata
*/
enum st { st_error = 0, st_name, st_data };
struct automata {
struct magi_param_list ** list;
struct magi_param param;
int size;
int len;
};
static enum st parse_name(struct automata * a, char c)
{
if (c == '&' || c == ';') { /* Impossible character means error. */
return st_error;
}
if (c == '=') { /* Separator ends name. */
a->size = 1;
a->len = 0;
return st_data;
}
if (!magi_str_add(&a->param.name, &a->len, &a->size, c)) {
return st_error;
}
return st_name;
}
static enum st end_data(struct automata * a)
{
if (deurl(&a->param.name) && deurl(&a->param.data)) {
if (magi_param_list_add(a->list, &a->param)) {
a->size = 1;
a->len = 0;
a->param.name = 0;
a->param.data = 0;
return st_name;
}
}
return st_error;
}
static enum st parse_data(struct automata * a, char c)
{
if (c == '=') { /* Impossible character means error. */
return st_error;
}
if (c == '&' || c == ';') { /* Separator ends data. */
return end_data(a);
}
if (!magi_str_add(&a->param.data, &a->len, &a->size, c)) {
return st_error;
}
return st_data;
}
void magi_urlenc(struct magi_param_list ** list,
struct magi_request * request,
const char * encoded)
{
enum st state;
struct automata a = { 0, { 0, 0 }, 1, 0 };
a.list = list;
*list = 0;
if (!encoded || !*encoded) {
return;
}
for (state = st_name; state && *encoded; ++encoded) {
if (state == st_name) {
state = parse_name(&a, *encoded);
} else {
state = parse_data(&a, *encoded);
}
}
if (state == st_name || !state || !end_data(&a)) {
free(a.param.name);
free(a.param.data);
request->error = magi_error_urlenc;
}
}
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* URL Encoding
*/
int magi_urlenc_size(const char * plain)
{
int size;
if (!plain) {
return 0;
}
for (size = 0; *plain; ++plain, ++size) {
if (!is_url(*plain)) {
size += 2;
}
}
return size;
}
void magi_urlencode(const char * plain, char * code)
{
if (!plain || !code) {
return;
}
while (*plain) {
if (is_url(*plain)) {
*++code = *plain;
} else {
*++code = '%';
*++code = to_hex(*plain & 0x0F);
*++code = to_hex(*plain >> 4);
}
++plain;
}
}
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