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url.c
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url.c
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/* url.c
* (c) 2002 Mikulas Patocka
* This file is a part of the Links program, released under GPL.
*/
#include <string.h>
#include "links.h"
static const struct {
char *prot;
int port;
void (*func)(struct connection *);
void (*nc_func)(struct session *, unsigned char *);
int free_syntax;
int need_slashes;
int need_slash_after_host;
int allow_post;
int bypasses_socks;
} protocols[] = {
{"data", 0, data_func, NULL, 1, 0, 0, 0, 0},
{ "file", 0, file_func, NULL, 1, 1, 0, 0, 1},
{ "https", 443, https_func, NULL, 0, 1, 1, 1, 0},
{ "http", 80, http_func, NULL, 0, 1, 1, 1, 0},
{ "proxy", 3128, proxy_func, NULL, 0, 1, 1, 1, 0},
{ NULL, 0, NULL, NULL, 0, 0, 0, 0, 0}
};
static int
check_protocol(unsigned char *p, size_t l)
{
int i;
for (i = 0; protocols[i].prot; i++)
if (!casecmp(cast_uchar protocols[i].prot, p, l)
&& strlen(protocols[i].prot) == l)
return i;
return -1;
}
static int
get_prot_info(unsigned char *prot, int *port,
void (**func)(struct connection *),
void (**nc_func)(struct session *ses, unsigned char *),
int *allow_post, int *bypasses_socks)
{
int i;
for (i = 0; protocols[i].prot; i++)
if (!casestrcmp(cast_uchar protocols[i].prot, prot)) {
if (port)
*port = protocols[i].port;
if (func)
*func = protocols[i].func;
if (nc_func)
*nc_func = protocols[i].nc_func;
if (allow_post)
*allow_post = protocols[i].allow_post;
if (bypasses_socks)
*bypasses_socks = protocols[i].bypasses_socks;
return 0;
}
return -1;
}
int
parse_url(unsigned char *url, int *prlen, unsigned char **user, int *uslen,
unsigned char **pass, int *palen, unsigned char **host, int *holen,
unsigned char **port, int *polen, unsigned char **data, int *dalen,
unsigned char **post)
{
unsigned char *p, *q;
unsigned char p_c[2];
int a;
if (prlen)
*prlen = 0;
if (user)
*user = NULL;
if (uslen)
*uslen = 0;
if (pass)
*pass = NULL;
if (palen)
*palen = 0;
if (host)
*host = NULL;
if (holen)
*holen = 0;
if (port)
*port = NULL;
if (polen)
*polen = 0;
if (data)
*data = NULL;
if (dalen)
*dalen = 0;
if (post)
*post = NULL;
if (!url || !(p = cast_uchar strchr(cast_const_char url, ':')))
return -1;
if (prlen)
*prlen = (int)(p - url);
if ((a = check_protocol(url, p - url)) == -1)
return -1;
if (p[1] != '/' || p[2] != '/') {
if (protocols[a].need_slashes)
return -1;
p -= 2;
}
if (protocols[a].free_syntax) {
if (data)
*data = p + 3;
if (dalen)
*dalen = strlen((char *)(p + 3));
return 0;
}
p += 3;
q = p + strcspn(cast_const_char p, "@/?");
if (!*q && protocols[a].need_slash_after_host)
return -1;
if (*q == '@') {
unsigned char *pp;
while (strcspn(cast_const_char(q + 1), "@")
< strcspn(cast_const_char(q + 1), "/?"))
q = q + 1 + strcspn(cast_const_char(q + 1), "@");
pp = cast_uchar strchr(cast_const_char p, ':');
if (!pp || pp > q) {
if (user)
*user = p;
if (uslen)
*uslen = (int)(q - p);
} else {
if (user)
*user = p;
if (uslen)
*uslen = (int)(pp - p);
if (pass)
*pass = pp + 1;
if (palen)
*palen = (int)(q - pp - 1);
}
p = q + 1;
}
if (p[0] == '[') {
q = cast_uchar strchr((char *)p, ']');
if (q) {
q++;
goto have_host;
}
}
q = p + strcspn((char *)p, ":/?");
have_host:
if (!*q && protocols[a].need_slash_after_host)
return -1;
if (host)
*host = p;
if (holen)
*holen = (int)(q - p);
if (*q == ':') {
unsigned char *pp = q + strcspn((char *)q, "/");
int cc;
if (*pp != '/' && protocols[a].need_slash_after_host)
return -1;
if (port)
*port = q + 1;
if (polen)
*polen = (int)(pp - q - 1);
for (cc = 0; cc < pp - q - 1; cc++)
if (q[cc + 1] < '0' || q[cc + 1] > '9')
return -1;
q = pp;
}
if (*q && *q != '?')
q++;
p = q;
p_c[0] = POST_CHAR;
p_c[1] = 0;
q = p + strcspn((char *)p, (char *)p_c);
if (data)
*data = p;
if (dalen)
*dalen = (int)(q - p);
if (post)
*post = *q ? q + 1 : NULL;
return 0;
}
unsigned char *
get_protocol_name(unsigned char *url)
{
int l;
if (parse_url(url, &l, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL))
return NULL;
return memacpy(url, l);
}
unsigned char *
get_keepalive_id(unsigned char *url)
{
unsigned char *h, *p, *k, *d;
int hl, pl;
if (parse_url(url, NULL, NULL, NULL, NULL, NULL, &h, &hl, &p, &pl, &d,
NULL, NULL))
return NULL;
if (is_proxy_url(url) && !casecmp(d, cast_uchar "https://", 8)) {
if (parse_url(d, NULL, NULL, NULL, NULL, NULL, &h, &hl, &p, &pl,
NULL, NULL, NULL))
return NULL;
}
k = p ? p + pl : h ? h + hl : NULL;
if (!k)
return stracpy(cast_uchar "");
return memacpy(url, k - url);
}
unsigned char *
get_host_name(unsigned char *url)
{
unsigned char *h;
int hl;
if (parse_url(url, NULL, NULL, NULL, NULL, NULL, &h, &hl, NULL, NULL,
NULL, NULL, NULL))
return stracpy(cast_uchar "");
return memacpy(h, hl);
}
unsigned char *
get_user_name(unsigned char *url)
{
unsigned char *h;
int hl;
if (parse_url(url, NULL, &h, &hl, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL))
return NULL;
return memacpy(h, hl);
}
unsigned char *
get_pass(unsigned char *url)
{
unsigned char *h;
int hl;
if (parse_url(url, NULL, NULL, NULL, &h, &hl, NULL, NULL, NULL, NULL,
NULL, NULL, NULL))
return NULL;
return memacpy(h, hl);
}
unsigned char *
get_port_str(unsigned char *url)
{
unsigned char *h;
int hl;
if (parse_url(url, NULL, NULL, NULL, NULL, NULL, NULL, NULL, &h, &hl,
NULL, NULL, NULL))
return NULL;
return hl ? memacpy(h, hl) : NULL;
}
int
get_port(unsigned char *url)
{
unsigned char *h;
int hl;
long n = -1;
if (parse_url(url, NULL, NULL, NULL, NULL, NULL, NULL, NULL, &h, &hl,
NULL, NULL, NULL))
return -1;
if (h) {
n = strtol((char *)h, NULL, 10);
if (n > 0 && n < 65536)
return (int)n;
return -1;
}
if ((h = get_protocol_name(url))) {
int nn = -1;
get_prot_info(h, &nn, NULL, NULL, NULL, NULL);
free(h);
n = nn;
}
return (int)n;
}
void (*get_protocol_handle(unsigned char *url))(struct connection *)
{
unsigned char *p;
void (*f)(struct connection *) = NULL;
int post = 0;
if (!(p = get_protocol_name(url)))
return NULL;
get_prot_info(p, NULL, &f, NULL, &post, NULL);
free(p);
if (!post && strchr(cast_const_char url, POST_CHAR))
return NULL;
return f;
}
void (*get_external_protocol_function(unsigned char *url))(struct session *,
unsigned char *)
{
unsigned char *p;
void (*f)(struct session *, unsigned char *) = NULL;
int post = 0;
if (!(p = get_protocol_name(url)))
return NULL;
get_prot_info(p, NULL, NULL, &f, &post, NULL);
free(p);
if (!post && strchr(cast_const_char url, POST_CHAR))
return NULL;
return f;
}
int
url_bypasses_socks(unsigned char *url)
{
int ret = 0;
unsigned char *p;
if (!(p = get_protocol_name(url)))
return 1;
get_prot_info(p, NULL, NULL, NULL, NULL, &ret);
free(p);
return ret;
}
unsigned char *
get_url_data(unsigned char *url)
{
unsigned char *d;
if (parse_url(url, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
&d, NULL, NULL))
return NULL;
return d;
}
#define dsep(x) (lo ? dir_sep(x) : (x) == '/')
static void
translate_directories(unsigned char *url)
{
unsigned char *dd = get_url_data(url);
unsigned char *s, *d;
int lo = !casecmp(url, cast_uchar "file://", 7);
if (!casecmp(url, cast_uchar "javascript:", 11))
return;
if (!casecmp(url, cast_uchar "magnet:", 7))
return;
if (!dd || dd == url)
return;
if (!dsep(*dd)) {
dd--;
if (!dsep(*dd)) {
dd++;
memmove(dd + 1, dd, strlen((char *)dd) + 1);
*dd = '/';
}
}
s = dd;
d = dd;
r:
if (end_of_dir(url, s[0])) {
memmove(d, s, strlen((char *)s) + 1);
return;
}
if (dsep(s[0]) && s[1] == '.'
&& (dsep(s[2]) || !s[2] || end_of_dir(url, s[2]))) {
if (!dsep(s[2]))
*d++ = *s;
s += 2;
goto r;
}
if (dsep(s[0]) && s[1] == '.' && s[2] == '.'
&& (dsep(s[3]) || !s[3] || end_of_dir(url, s[3]))) {
while (d > dd) {
d--;
if (dsep(*d))
goto b;
}
b:
if (!dsep(s[3]))
*d++ = *s;
s += 3;
goto r;
}
if ((*d++ = *s++))
goto r;
}
static unsigned char *
translate_hashbang(unsigned char *up)
{
unsigned char *u, *p, *dp, *data, *post_seq;
int q;
unsigned char *r;
int rl;
if (!strstr((char *)up, "#!") && !strstr((char *)up, "#%21"))
return up;
u = stracpy(up);
p = extract_position(u);
if (!p) {
free_u_ret_up:
free(u);
return up;
}
if (p[0] == '!')
dp = p + 1;
else if (!casecmp(p, cast_uchar "%21", 3))
dp = p + 3;
else {
free(p);
goto free_u_ret_up;
}
if (!(post_seq = cast_uchar strchr((char *)u, POST_CHAR)))
post_seq = cast_uchar strchr((char *)u, 0);
data = get_url_data(u);
if (!data)
data = u;
r = NULL;
rl = add_bytes_to_str(&r, 0, u, post_seq - u);
q = strlen((char *)data);
if (q && (data[q - 1] == '&' || data[q - 1] == '?'))
;
else if (strchr((char *)data, '?'))
rl = add_chr_to_str(&r, rl, '&');
else
rl = add_chr_to_str(&r, rl, '?');
rl = add_to_str(&r, rl, cast_uchar "_escaped_fragment_=");
for (; *dp; dp++) {
unsigned char c = *dp;
if (c <= 0x20 || c == 0x23 || c == 0x25 || c == 0x26
|| c == 0x2b || c >= 0x7f) {
unsigned char h[4];
sprintf((char *)h, "%%%02X", c);
rl = add_to_str(&r, rl, h);
} else
rl = add_chr_to_str(&r, rl, c);
}
rl = add_to_str(&r, rl, post_seq);
free(u);
free(p);
free(up);
return r;
}
static unsigned char *
rewrite_url_google_docs(unsigned char *n)
{
int i;
unsigned char *id, *id_end, *url_end;
unsigned char *res;
size_t l;
struct {
const char *beginning;
const char *result1;
const char *result2;
} const patterns[] = {
{"https://docs.google.com/document/d/",
"https://docs.google.com/document/d/", "/export?format=pdf"},
{ "https://docs.google.com/document/u/",
"https://docs.google.com/document/u/", "/export?format=pdf"},
{ "https://docs.google.com/spreadsheets/d/",
"https://docs.google.com/spreadsheets/d/", "/export?format=pdf"},
{ "https://docs.google.com/spreadsheets/u/",
"https://docs.google.com/spreadsheets/u/", "/export?format=pdf"},
{ "https://docs.google.com/presentation/d/",
"https://docs.google.com/presentation/d/", "/export/pdf" },
{ "https://docs.google.com/presentation/u/",
"https://docs.google.com/presentation/u/", "/export/pdf" },
{ "https://drive.google.com/file/d/",
"https://drive.google.com/uc?export=download&id=", "" },
{ "https://drive.google.com/file/u/",
"https://drive.google.com/uc?export=download&id=", "" }
};
for (i = 0; i < array_elements(patterns); i++)
if (!cmpbeg(n, cast_uchar patterns[i].beginning))
goto match;
return n;
match:
id = n + strlen(patterns[i].beginning);
url_end = id + strcspn(cast_const_char id, "#" POST_CHAR_STRING);
id_end = memchr(id, '/', url_end - id);
if (!id_end)
return n;
if (!cmpbeg(id_end, cast_uchar "/export"))
return n;
if (!patterns[i].result2[0]) {
id = id_end;
while (id[-1] != '/')
id--;
}
res = NULL;
l = add_to_str(&res, 0, cast_uchar patterns[i].result1);
l = add_bytes_to_str(&res, l, id, id_end - id);
l = add_to_str(&res, l, cast_uchar patterns[i].result2);
free(n);
return res;
}
static unsigned char *
rewrite_url_mediawiki_svg(unsigned char *n)
{
const char u1[] = "/media/math/render/svg/";
const char u2[] = "/media/math/render/png/";
unsigned char *d, *s;
d = get_url_data(n);
if (!d)
return n;
s = cast_uchar strstr((char *)d, u1);
if (!s)
return n;
memcpy(s, u2, strlen(u2));
return n;
}
static unsigned char *
rewrite_url(unsigned char *n)
{
extend_str(&n, 1);
translate_directories(n);
n = translate_hashbang(n);
n = rewrite_url_google_docs(n);
n = rewrite_url_mediawiki_svg(n);
return n;
}
static int
test_qualified_name(char *host, char *hostname)
{
char *c;
if (!strcasecmp(host, hostname))
return 1;
c = strchr(hostname, '.');
if (c) {
*c = 0;
if (!strcasecmp(host, hostname))
return 1;
}
return 0;
}
static int
is_local_host(char *host)
{
if (!*host)
return 1;
if (!strcasecmp(host, "localhost"))
return 1;
{
int rs;
char n[4096];
n[0] = 0;
EINTRLOOP(rs, gethostname(n, sizeof(n)));
n[sizeof(n) - 1] = 0;
if (!rs && strlen(n) < sizeof(n) - 1) {
if (test_qualified_name(host, n))
return 1;
}
}
return 0;
}
static void
insert_wd(unsigned char **up, unsigned char *cwd)
{
unsigned char *u = *up;
unsigned char *cw;
unsigned char *url;
char *host;
size_t url_l;
int i;
if (!u || !cwd || !*cwd)
return;
if (casecmp(u, cast_uchar "file://", 7))
return;
for (i = 7; u[i] && !dir_sep(u[i]); i++)
;
host = cast_char memacpy(u + 7, i - 7);
if (is_local_host(host)) {
free(host);
memmove(u + 7, u + i, strlen(cast_const_char(u + i)) + 1);
return;
}
free(host);
url = NULL;
url_l = add_bytes_to_str(&url, 0, u, 7);
for (cw = cwd; *cw; cw++) {
unsigned char c = *cw;
if (c < ' ' || c == '%' || c >= 127) {
unsigned char h[4];
sprintf((char *)h, "%%%02X", (unsigned)c & 0xff);
url_l = add_to_str(&url, url_l, h);
} else
url_l = add_chr_to_str(&url, url_l, c);
}
if (!dir_sep(cwd[strlen((char *)cwd) - 1]))
url_l = add_chr_to_str(&url, url_l, '/');
url_l = add_to_str(&url, url_l, u + 7);
free(u);
*up = url;
}
int
url_non_ascii(unsigned char *url)
{
unsigned char *ch;
for (ch = url; *ch; ch++)
if (*ch >= 128)
return 1;
return 0;
}
static unsigned char *
translate_idn(unsigned char *nu, int canfail)
{
if (url_non_ascii(nu)) {
unsigned char *id = idn_encode_url(nu, 0);
if (!id) {
if (!canfail)
return nu;
free(nu);
return NULL;
}
free(nu);
return id;
}
return nu;
}
/*
* U funkce join_urls musi byt prvni url absolutni (takove, co projde funkci
* parse_url bez chyby --- pokud neni absolutni, tak to spatne na internal) a
* druhe url je relativni cesta vuci nemu nebo taky absolutni url. Pokud je
* druhe url absolutni, vrati se to; pokud je relativni, tak se spoji prvni a
* druhe url.
*/
unsigned char *
join_urls(unsigned char *base, unsigned char *rel)
{
unsigned char *p, *n, *pp, *ch;
int l;
int lo = !casecmp(base, cast_uchar "file://", 7);
int data = !casecmp(base, cast_uchar "data:", 5);
if (rel[0] == '#' || !rel[0]) {
n = stracpy(base);
for (p = n; *p && *p != POST_CHAR && *p != '#'; p++)
;
*p = 0;
add_to_strn(&n, rel);
goto return_n;
}
if (rel[0] == '?' || rel[0] == '&') {
unsigned char rj[3];
unsigned char *d = get_url_data(base);
if (!d)
goto bad_base;
rj[0] = rel[0];
rj[1] = POST_CHAR;
rj[2] = 0;
d += strcspn((char *)d, (char *)rj);
n = memacpy(base, d - base);
add_to_strn(&n, rel);
goto return_n;
}
if (rel[0] == '/' && rel[1] == '/' && !data) {
unsigned char *s;
if (!(s = cast_uchar strstr(cast_const_char base, "//"))) {
if (!(s = cast_uchar strchr(cast_const_char base,
':'))) {
bad_base:
internal("bad base url: %s", base);
return NULL;
}
s++;
}
n = memacpy(base, s - base);
add_to_strn(&n, rel);
if (!parse_url(n, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL))
goto return_n;
add_to_strn(&n, cast_uchar "/");
if (!parse_url(n, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL))
goto return_n;
free(n);
}
if (is_proxy_url(rel))
goto prx;
if (!parse_url(rel, &l, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL)) {
n = stracpy(rel);
goto return_n;
}
n = stracpy(rel);
while (n[0] && n[strlen((char *)n) - 1] <= ' ')
n[strlen((char *)n) - 1] = 0;
extend_str(&n, 1);
ch = cast_uchar strrchr((char *)n, '#');
if (!ch || strchr((char *)ch, '/'))
ch = n + strlen((char *)n);
memmove(ch + 1, ch, strlen((char *)ch) + 1);
*ch = '/';
if (!parse_url(n, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL))
goto return_n;
free(n);
prx:
if (parse_url(base, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, &p, NULL, NULL)
|| !p) {
goto bad_base;
}
if (!dsep(*p))
p--;
if (!data) {
if (end_of_dir(base, rel[0]))
for (; *p; p++) {
if (end_of_dir(base, *p))
break;
}
else if (!dsep(rel[0]))
for (pp = p; *pp; pp++) {
if (end_of_dir(base, *pp))
break;
if (dsep(*pp))
p = pp + 1;
}
}
n = memacpy(base, p - base);
add_to_strn(&n, rel);
goto return_n;
return_n:
n = translate_idn(n, 0);
n = rewrite_url(n);
return n;
}
unsigned char *
translate_url(unsigned char *url, unsigned char *cwd)
{
unsigned char *ch;
unsigned char *nu, *da;
unsigned char *prefix;
int sl;
while (*url == ' ')
url++;
if (*url && url[strlen((char *)url) - 1] == ' ') {
nu = stracpy(url);
while (*nu && nu[strlen((char *)nu) - 1] == ' ')
nu[strlen((char *)nu) - 1] = 0;
ch = translate_url(nu, cwd);
free(nu);
return ch;
}
if (is_proxy_url(url))
return NULL;
if (!parse_url(url, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, &da, NULL, NULL)) {
nu = stracpy(url);
goto return_nu;
}
if (strchr((char *)url, POST_CHAR))
return NULL;
if (strstr((char *)url, "://")) {
nu = stracpy(url);
extend_str(&nu, 1);
ch = cast_uchar strrchr((char *)nu, '#');
if (!ch || strchr((char *)ch, '/'))
ch = nu + strlen((char *)nu);
memmove(ch + 1, ch, strlen((char *)ch) + 1);
*ch = '/';
if (!parse_url(nu, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL))
goto return_nu;
free(nu);
}
prefix = cast_uchar "file://";
if (url[0] == '[' && strchr((char *)url, ']')) {
ch = url;
goto http;
}
ch = url + strcspn((char *)url, ".:/@");
sl = 0;
if (*ch != ':' || *(url + strcspn((char *)url, "/@")) == '@') {
if (*url != '.' && *ch == '.') {
unsigned char *e, *f, *g;
int tl;
for (e = ch + 1;
*(f = e + strcspn((char *)e, ".:/")) == '.';
e = f + 1)
;
g = memacpy(e, f - e);
tl = is_tld(g);
free(g);
if (tl) {
http:
prefix = cast_uchar "http://";
sl = 1;
}
}
if (*ch == '@' || *ch == ':'
|| !cmpbeg(url, cast_uchar "ftp.")) {
prefix = cast_uchar "ftp://";
sl = 1;
}
nu = stracpy(prefix);
add_to_strn(&nu, url);
if (sl && !strchr((char *)url, '/'))
add_to_strn(&nu, cast_uchar "/");
if (parse_url(nu, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL)) {
free(nu);
return NULL;
}
goto return_nu;
}
nu = memacpy(url, ch - url + 1);
add_to_strn(&nu, cast_uchar "//");
add_to_strn(&nu, ch + 1);
if (!parse_url(nu, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL))
goto return_nu;
add_to_strn(&nu, cast_uchar "/");
if (!parse_url(nu, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL))
goto return_nu;
free(nu);
return NULL;
return_nu:
nu = translate_idn(nu, 1);
if (!nu)
return NULL;
insert_wd(&nu, cwd);
nu = rewrite_url(nu);
return nu;
}
unsigned char *
extract_position(unsigned char *url)
{
unsigned char *u, *uu, *r;
if ((u = get_url_data(url)))
url = u;
if (!(u = cast_uchar strchr((char *)url, POST_CHAR)))
u = cast_uchar strchr((char *)url, 0);
if (!(uu = memchr(url, '#', u - url)))
return NULL;
r = memacpy(uu + 1, u - uu - 1);
memmove(uu, u, strlen((char *)u) + 1);
return r;
}
int
url_not_saveable(unsigned char *url)
{
int p, palen;
unsigned char *u = translate_url(url, cast_uchar "/");
if (!u)
return 1;
p = parse_url(u, NULL, NULL, NULL, NULL, &palen, NULL, NULL, NULL, NULL,
NULL, NULL, NULL);
free(u);
return p || palen;
}
#define accept_char(x) \
((x) != 10 && (x) != 13 && (x) != '"' && (x) != '\'' && (x) != '&' \
&& (x) != '<' && (x) != '>')
#define special_char(x) ((x) < ' ' || (x) == '%' || (x) == '#' || (x) >= 127)
/*
* -2 percent to raw
* -1 percent to html
* 0 raw to html
* 1 raw to percent
*/
size_t
add_conv_str(unsigned char **s, size_t l, unsigned char *b, int ll,
int encode_special)
{
for (; ll > 0; ll--, b++) {
unsigned char chr = *b;
if (!chr)
continue;
if (special_char(chr) && encode_special == 1) {
unsigned char h[4];
sprintf((char *)h, "%%%02X", (unsigned)chr & 0xff);
l = add_to_str(s, l, h);
continue;
}
if (chr == '%' && encode_special <= -1 && ll > 2
&& ((b[1] >= '0' && b[1] <= '9')
|| (b[1] >= 'A' && b[1] <= 'F')
|| (b[1] >= 'a' && b[1] <= 'f'))
&& ((b[2] >= '0' && b[2] <= '9')
|| (b[2] >= 'A' && b[2] <= 'F')
|| (b[2] >= 'a' && b[2] <= 'f'))) {
int i;
chr = 0;
for (i = 1; i < 3; i++) {
if (b[i] >= '0' && b[i] <= '9')
chr = chr * 16 + b[i] - '0';
if (b[i] >= 'A' && b[i] <= 'F')
chr = chr * 16 + b[i] - 'A' + 10;
if (b[i] >= 'a' && b[i] <= 'f')
chr = chr * 16 + b[i] - 'a' + 10;
}
ll -= 2;
b += 2;
if (!chr)
continue;
}
if (chr == ' ' && (!encode_special || encode_special == -1))
l = add_to_str(s, l, cast_uchar " ");
else if (accept_char(chr) || encode_special == -2)
l = add_chr_to_str(s, l, chr);
else if (chr == 10 || chr == 13) {
continue;
} else {
l = add_to_str(s, l, cast_uchar "&#");
l = add_num_to_str(s, l, (int)chr);
l = add_chr_to_str(s, l, ';');
}
}
return l;
}
void
convert_file_charset(unsigned char **s, int *l, int start_l)
{
}
static const char xn[] = "xn--";
static const size_t xn_l = sizeof(xn) - 1;
#define puny_max_length 63
#define puny_base 36
#define puny_tmin 1
#define puny_tmax 26
#define puny_skew 38
#define puny_damp 700
#define puny_init_bias 72
static int
ascii_allowed(unsigned c)
{
return c == '-' || (c >= '0' && c <= '9') || (c >= 'A' && c <= 'Z')
|| (c >= 'a' && c <= 'z');
}
static unsigned char
puny_chrenc(unsigned n)
{
return n + (n < 26 ? 'a' : '0' - 26);
}
static unsigned
puny_chrdec(unsigned char c)
{
if (c <= '9')
return c - '0' + 26;
if (c <= 'Z')
return c - 'A';
return c - 'a';
}
struct puny_state {
unsigned ascii_numpoints;
unsigned numpoints;
unsigned bias;
unsigned k;
};
static void
puny_init(struct puny_state *st, unsigned numpoints)
{
st->ascii_numpoints = numpoints;
st->numpoints = numpoints;
st->bias = puny_init_bias;
st->k = puny_base;
}
static unsigned
puny_threshold(struct puny_state *st)
{
unsigned k = st->k;
st->k += puny_base;
if (k <= st->bias)
return puny_tmin;
if (k >= st->bias + puny_tmax)
return puny_tmax;
return k - st->bias;
}
static void
puny_adapt(struct puny_state *st, unsigned val)
{
unsigned k;
val = st->ascii_numpoints == st->numpoints ? val / puny_damp : val / 2;
st->numpoints++;