зеркало из https://github.com/microsoft/ivy.git
59 строки
1.6 KiB
Plaintext
59 строки
1.6 KiB
Plaintext
|
#lang ivy1.7
|
||
|
|
|
||
|
|
# a fake deserializer for quic
|
||
|
|
|
||
|
|
object quic_deser = {}
|
||
|
|
|
||
|
|
<<< member
|
||
|
|
|
||
|
|
class `quic_deser`;
|
||
|
|
|
||
|
|
>>>
|
||
|
|
|
||
|
|
<<< impl
|
||
|
|
|
||
|
|
class `quic_deser` : public ivy_binary_deser {
|
||
|
|
enum {quic_s_init,
|
||
|
|
quic_s_type,
|
||
|
|
quic_s_cid,
|
||
|
|
quic_s_version,
|
||
|
|
quic_s_pkt_num,
|
||
|
|
quic_s_payload,
|
||
|
|
quic_s_done} state;
|
||
|
|
bool long_format;
|
||
|
|
char hdr_type;
|
||
|
|
|
||
|
|
public:
|
||
|
|
quic_deser(const std::vector<char> &inp) : ivy_binary_deser(inp),state(quic_s_init) {
|
||
|
|
pos = 42; // skip 42 bytes of IP and UDP header
|
||
|
|
}
|
||
|
|
virtual void get(long long &res) {
|
||
|
|
if (state == quic_s_init) {
|
||
|
|
getn(res,1);
|
||
|
|
long_format = (res & 0x80) ? true : false;
|
||
|
|
hdr_type = res & 0x7f;
|
||
|
|
res = long_format;
|
||
|
|
state = quic_s_type;
|
||
|
|
} else if (state == quic_s_type) {
|
||
|
|
res = hdr_type;
|
||
|
|
state = quic_s_cid;
|
||
|
|
} else if (state == quic_s_cid) {
|
||
|
|
ivy_binary_deser::get(res);
|
||
|
|
state = quic_s_version;
|
||
|
|
} else if (state == quic_s_version) {
|
||
|
|
if (long_format)
|
||
|
|
ivy_binary_deser::getn(res,4);
|
||
|
|
else
|
||
|
|
res = 0;
|
||
|
|
state = quic_s_pkt_num;
|
||
|
|
} else if (state == quic_s_pkt_num) {
|
||
|
|
ivy_binary_deser::getn(res,(long_format || (hdr_type & 0x1f) == 0x1d) ? 4 : (hdr_type & 0x1f) == 0x1e ? 2 : 1);
|
||
|
|
state = quic_s_done;
|
||
|
|
}
|
||
|
|
else throw deser_err();
|
||
|
|
}
|
||
|
|
~quic_deser(){}
|
||
|
|
};
|
||
|
|
|
||
|
|
>>>
|