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add comment to func cryptpacket_received
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@ -2755,6 +2755,13 @@ int64_t write_cryptpacket(Net_Crypto *c, int crypt_connection_id, const uint8_t
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*
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* return -1 on failure.
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* return 0 on success.
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*
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* Note: The condition `buffer_end - buffer_start < packet_number - buffer_start` is
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* a trick which handles situations `buffer_end >= buffer_start` and
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* `buffer_end < buffer_start`(when buffer_end overflowed) both correctly
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*
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* It CANNOT be simplified to `packet_number < buffer_start`, as it will fail
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* when `buffer_end < buffer_start`.
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*/
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int cryptpacket_received(Net_Crypto *c, int crypt_connection_id, uint32_t packet_number)
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{
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