/**
* Fills @val with second part of special HTTP header containing the header
* value.
*/
void
tfw_http_msg_hdr_val(TfwStr *hdr, unsigned id, TfwStr *val)
{
static const size_t hdr_lens[] = {
[TFW_HTTP_HDR_HOST] = sizeof("Host:") - 1,
[TFW_HTTP_HDR_CONTENT_LENGTH] = sizeof("Content-Length:") - 1,
[TFW_HTTP_HDR_CONTENT_TYPE] = sizeof("Content-Type:") - 1,
[TFW_HTTP_HDR_CONNECTION] = sizeof("Connection:") - 1,
[TFW_HTTP_HDR_X_FORWARDED_FOR] = sizeof("X-Forwarded-For:") - 1,
[TFW_HTTP_HDR_USER_AGENT] = sizeof("User-Agent:") - 1,
[TFW_HTTP_HDR_COOKIE] = sizeof("Cookie:") - 1,
};
TfwStr *c, *end;
int nlen = hdr_lens[id];
BUG_ON(TFW_STR_DUP(hdr));
BUG_ON(id >= TFW_HTTP_HDR_RAW);
/* Only Host: header is allowed to be empty
* If header string is plain, it is always empty header.
* Not empty headers are compount strings. */
BUG_ON(id == TFW_HTTP_HDR_HOST ? (nlen > hdr->len) :
(nlen >= hdr->len || TFW_STR_PLAIN(hdr)));
*val = *hdr;
/* Field value, if it exist, lies in the separate chunk.
* So we skip several first chunks, containing field name,
* to get the field value. If we have field with empty value,
* we get an empty string with val->len = 0 and val->ptr from the
* last name's chunk, but it is unimportant.
*/
TFW_STR_FOR_EACH_CHUNK(c, hdr, end) {
BUG_ON(!c->len);
if (nlen > 0) {
nlen -= c->len;
val->len -= c->len;
}
else if (unlikely(((char *)c->ptr)[0] == ' '
|| ((char *)c->ptr)[0] == '\t'))
{
/*
* RFC 7230: skip OWS before header field.
* In most cases OWS is on the same chunk with
* the header name.
* Header field-value always begins at new chunk.
*/
val->len -= c->len;
}
else {
break;
}
TFW_STR_CHUNKN_SUB(val, 1);
}
/**
* Fills @val with second part of specula HTTP header containing the header
* value.
*/
void
tfw_http_msg_hdr_val(TfwStr *hdr, int id, TfwStr *val)
{
static const size_t hdr_lens[] = {
[TFW_HTTP_HDR_HOST] = sizeof("Host:") - 1,
[TFW_HTTP_HDR_CONTENT_LENGTH] = sizeof("Content-Length:") - 1,
[TFW_HTTP_HDR_CONNECTION] = sizeof("Connection:") - 1,
[TFW_HTTP_HDR_X_FORWARDED_FOR] = sizeof("X-Forwarded-For:") - 1,
};
TfwStr *c;
int nlen = hdr_lens[id];
BUG_ON(TFW_STR_PLAIN(hdr));
BUG_ON(TFW_STR_DUP(hdr));
BUG_ON(nlen >= hdr->len);
BUG_ON(id >= TFW_HTTP_HDR_RAW);
*val = *hdr;
val->len -= nlen;
TFW_STR_FOR_EACH_CHUNK(c, hdr, {
BUG_ON(!c->len);
BUG_ON(c->len >= val->len);
if (nlen > 0) {
nlen -= val->len;
}
else if (unlikely(((char *)c->ptr)[0] == ' '
|| ((char *)c->ptr)[0] == '\t'))
{
/*
* RFC 7230: skip OWS before header field.
* In most cases OWS is on the same chunk with
* the header name.
* Header field always begins at new chunk.
*/
val->len -= c->len;
}
else {
break;
}
TFW_STR_CHUNKN_SUB(val, 1);
});
void
tfw_str_del_chunk(TfwStr *str, int id)
{
unsigned int cn = TFW_STR_CHUNKN(str);
if (unlikely(TFW_STR_PLAIN(str)))
return;
BUG_ON(TFW_STR_DUP(str));
BUG_ON(id >= cn);
if (TFW_STR_CHUNKN(str) == 2) {
/* Just fall back to plain string. */
*str = *((TfwStr *)str->ptr + (id ^ 1));
return;
}
str->len -= TFW_STR_CHUNK(str, id)->len;
TFW_STR_CHUNKN_SUB(str, 1);
/* Move all chunks after @id. */
memmove((TfwStr *)str->ptr + id, (TfwStr *)str->ptr + id + 1,
(cn - id - 1) * sizeof(TfwStr));
}
