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#include "cookies.h"
#include "tools.h"
#include <stdlib.h>
#include <string.h>
typedef enum dt { dt_plain = 0, dt_version, dt_path, dt_domain } dt;
typedef struct automata {
magi_cookies **list;
magi_cookie cookie;
char *buf;
int buf_len;
int buf_size;
int is_first;
int is_advanced;
int is_quoted;
dt datatype;
} automata;
typedef void *(*state)(automata *a, char c);
static void nulify_cookie(automata *a)
{
a->cookie.name = 0;
a->cookie.data = 0;
a->cookie.path = 0;
a->cookie.domain = 0;
a->cookie.max_age = 0;
}
static void buf_new(automata *a)
{
a->buf = 0;
a->buf_len = 0;
a->buf_size = 1;
}
static dt what_is_name(const automata *a)
{
dt datatype = dt_plain;
if (a->is_first && !strcmp(a->buf, "$Version")) {
datatype = dt_version;
} else if (a->is_advanced) {
if (!strcmp(a->buf, "$Path")) {
datatype = dt_path;
} else if (!strcmp(a->buf, "$Domain")) {
datatype = dt_domain;
}
}
return datatype;
}
static void end_name(automata *a)
{
a->datatype = what_is_name(a);
if (a->datatype == dt_plain) {
if (a->cookie.name) {
magi_cookies_add(a->list, &a->cookie);
a->list = &(*a->list)->next;
}
nulify_cookie(a);
a->cookie.name = a->buf;
} else {
free(a->buf);
}
buf_new(a);
}
static int end_data(automata *a)
{
switch (a->datatype) {
case dt_plain: a->cookie.data = a->buf; break;
case dt_path: a->cookie.path = a->buf; break;
case dt_domain: a->cookie.domain = a->buf; break;
case dt_version: if (strcmp(a->buf, "1")) { return 0; }
}
buf_new(a);
return 1;
}
static void *state_name(automata *a, char c);
static void *state_pre_name(automata *a, char c)
{
if (c == ' ' || c == '\t'){
return state_pre_name;
} else if (32 <= c && c <= 126 && !strchr("()<>@,;:\\\"/[]?={}", c)) {
magi_str_add(&a->buf, &a->buf_len, &a->buf_size, c);
return state_name;
}
return 0;
}
static void *state_pre_data(automata *a, char c);
static void *state_post_name(automata *a, char c);
static void *state_name(automata *a, char c)
{
if (c == '=') {
end_name(a);
return state_pre_data;
} else if (c == ' ' || c == '\t') {
end_name(a);
return state_post_name;
} else if (32 <= c && c <= 126 && !strchr("()<>@,;:\\\"/[]?={}", c)) {
magi_str_add(&a->buf, &a->buf_len, &a->buf_size, c);
return state_name;
}
return 0;
}
static void *state_post_name(automata *a, char c)
{
if (c == '=') {
return state_pre_data;
} else if (c == ' ' || c == '\t') {
return state_post_name;
}
return 0;
}
static void *state_data(automata *a, char c);
static void *state_data_quoted(automata *a, char c);
static void *state_pre_data(automata *a, char c)
{
if (c == '"') {
return state_data_quoted;
} else if (c == ' ' || c == '\t') {
return state_pre_data;
} else if (32 <= c && c <= 126 && !strchr("()<>@,;:\\\"/[]?={}", c)) {
magi_str_add(&a->buf, &a->buf_len, &a->buf_size, c);
return state_data;
}
return 0;
}
static void *state_post_data(automata *a, char c);
static void *state_data(automata *a, char c)
{
if (c == ';' || (c == ',' && a->is_first)) {
a->is_first = 0;
return end_data(a) ? state_pre_name : 0;
} else if (c == ' ' || c == '\t') {
return end_data(a) ? state_post_data : 0;
} else if (32 <= c && c <= 126 && !strchr("()<>@,;:\\\"/[]?={}", c)) {
magi_str_add(&a->buf, &a->buf_len, &a->buf_size, c);
return state_data;
}
return 0;
}
static void *state_data_quoted(automata *a, char c)
{
if (c == '"') {
return end_data(a) ? state_post_data : 0;
}
return state_data_quoted;
}
static void *state_post_data(automata *a, char c)
{
if (c == ';' || (c == ',' && a->is_first)) {
a->is_first = 0;
return state_pre_name;
} else if (c == ' ' || c == '\t') {
return state_post_data;
}
return 0;
}
static void parse_end(magi_error *e, automata *a, state s)
{
if (s == state_data_quoted) {
*e = magi_error_cookies;
} else if (s == state_data) {
if (!a->cookie.name) {
*e = magi_error_cookies;
} else if (end_data(a)) {
magi_cookies_add(a->list, &a->cookie);
nulify_cookie(a);
} else {
*e = magi_error_cookies;
}
} else if (s != state_post_data) {
*e = magi_error_cookies;
}
}
void magi_parse_cookies(magi_request *request, const char *data)
{
state s;
automata a = { 0, { 0, 0, 0, 0, 0 }, 0, 0, 0, 1, 0, 0, 0 };
a.list = &request->cookies;
request->cookies = 0;
for (s = state_pre_name; s && *data; ++data) {
s = s(&a, *data);
}
parse_end(&request->error, &a, s);
free(a.cookie.name);
free(a.cookie.data);
free(a.cookie.path);
free(a.cookie.domain);
free(a.buf);
}
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