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#include "urlencoded.h"
#include "field.h"
#include "log.h"
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Local Shortcuts
*/
/* Shouldn't be called with 'c' as not hex digit. */
static char from_hex(char c)
{
char num;
if (isdigit(c)) {
num = c - '0';
} else {
num = toupper(c) - 'A' + 10;
}
return num;
}
static int is_hex(char c)
{
return isdigit(c) || strchr("ABCDEF", toupper(c));
}
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* URL Decoding
*/
static int deurl(char ** data)
{
int ok = 1;
if (*data) {
char * val = *data;
int ti = 0;
int ci;
for (ci = 0; ok && 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]); /* 00xx */
val[ti] |= from_hex(val[ci + 1]) << 4; /* XXxx */
ci += 2;
} else {
ok = 0;
magi_log(
"[urlencoded] Waiting for two hex digits after '%%', "
"readed: \\%o\\%o (render: %c%c)",
val[ci + 1], val[ci + 2], val[ci + 1], val[ci + 2]);
}
} else if (val[ci] == '+') {
val[ti] = ' ';
} else {
val[ti] = val[ci];
}
}
val[ti++] = 0;
} else {
*data = malloc(1);
**data = 0;
}
return ok;
}
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Urlencoded Automata
*/
enum st { st_error = 0, st_name, st_data };
struct automata {
struct magi_field_list ** list;
struct magi_field field;
int size;
int len;
};
static enum st parse_name(struct automata * a, char c)
{
enum st state;
if (c != '&' && c != ';') {
if (c == '=') {
state = st_data;
a->size = 1;
a->len = 0;
} else {
if (a->len == a->size - 1) {
a->size *= 2;
a->field.name = realloc(a->field.name, a->size);
}
if (!a->field.name) {
state = st_error;
magi_log("[urlencoded] Cannot allocate field name.");
} else {
state = st_name;
a->len++;
a->field.name[a->len - 1] = c;
a->field.name[a->len] = 0;
}
}
} else {
state = st_error;
magi_log(
"[urlencoded] Reading name, readed: \\%o (render: %c).", c, c);
}
return state;
}
static enum st end_data(struct automata * a)
{
enum st state = st_error;
if (deurl(&a->field.name) && deurl(&a->field.data)) {
a->field.len = strlen(a->field.data);
if (magi_field_list_add(a->list, &a->field)) {
state = st_name;
a->size = 1;
a->len = 0;
a->field.name = 0;
a->field.data = 0;
}
}
return state;
}
static enum st parse_data(struct automata * a, char c)
{
enum st state;
if (c != '=') {
if (c == '&' || c == ';') {
state = end_data(a);
} else {
if (a->len == a->size - 1) {
a->size *= 2;
a->field.data = realloc(a->field.data, a->size);
}
if (!a->field.data) {
state = st_error;
magi_log("[urlencoded] Cannot allocate field data.");
} else {
state = st_data;
a->len++;
a->field.data[a->len - 1] = c;
a->field.data[a->len] = 0;
}
}
} else {
state = st_error;
magi_log(
"[urlencoded] Reading data, readed: \\%o (render: %c).", c, c);
}
return state;
}
int magi_parse_urlencoded(struct magi_field_list ** list, const char * input)
{
enum st state = st_name;
struct automata a = { 0, { 0, 0, 0 }, 1, 0 };
if (input && *input) {
a.list = list;
while (state && *input) {
switch (state) {
case st_name:
state = parse_name(&a, *input);
break;
case st_data:
state = parse_data(&a, *input);
default:
break;
}
++input;
}
if (state == st_data) {
state = end_data(&a);
} else if (state == st_name) {
state = st_error;
magi_log("[urlencoded] Input ended while reading name.");
}
free(a.field.name);
free(a.field.data);
}
return state != st_error;
}
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