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#include "urlencoded.h"
#include "tools.h"
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Local Shortcuts
*/
static int is_hex(char c)
{
return isdigit(c) || strchr("abcdef", tolower(c));
}
/* Call only if is_hex(c). */
static int from_hex(char c)
{
if (isdigit(c)) {
return c - '0';
} else {
return tolower(c) - 'a' + 10;
}
}
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* 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])) {
return 0;
}
/* Since chars can be signed, arithmetics are not safe. */
val[ti] = from_hex(val[ci + 2]) | /* 0000xxxx */
from_hex(val[ci + 1]) << 4; /* XXXXxxxx */
ci += 2; /* Two extra characters are readed from code. */
} else if (val[ci] == '+') {
val[ti] = ' ';
} else {
val[ti] = val[ci];
}
}
val[ti] = 0;
return 1;
}
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Urlencoded Automata
*/
typedef struct automata {
magi_params **list;
char *name;
int nlen;
int nsize;
char *data;
int dlen;
int dsize;
} automata;
typedef void *(*state)(automata *a, char c);
static void *state_parse_data(automata *a, char c);
static void *state_parse_name(automata *a, char c)
{
if (c == '&' || c == ';') {
return 0;
} else if (c == '=') {
return deurl(&a->name) ? state_parse_data : 0;
}
magi_str_add(&a->name, &a->nlen, &a->nsize, c);
return state_parse_name;
}
static void add_to_list(automata *a)
{
magi_param param;
param.name = a->name;
param.data = a->data;
magi_params_add(a->list, ¶m);
a->name = 0;
a->data = 0;
}
static void *state_parse_data(automata *a, char c)
{
if (c == '=') {
return 0;
} else if (c == '&' || c == ';') {
if (!deurl(&a->data)) {
return 0;
}
add_to_list(a);
return state_parse_name;
}
magi_str_add(&a->data, &a->dlen, &a->dsize, c);
return state_parse_data;
}
magi_error magi_parse_urlencoded(magi_params **list, const char *encoded)
{
state s;
automata a = { 0, 0, 0, 0, 0, 0, 0 };
a.list = list;
*list = 0;
if (!encoded || !*encoded) {
return 0;
}
for (s = state_parse_name; s && *encoded; ++encoded) {
s = s(&a, *encoded);
}
if (s == state_parse_name || !s || !deurl(&a.data)) {
return magi_error_urlenc;
}
add_to_list(&a);
return 0;
}
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