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