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90 lines
2.5 KiB
C++
90 lines
2.5 KiB
C++
#ifndef LLARP_UTP_INBOUND_MESSAGE_HPP
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#define LLARP_UTP_INBOUND_MESSAGE_HPP
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#include <constants/link_layer.hpp>
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#include <util/aligned.hpp>
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#include <util/types.hpp>
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#include <utp_types.h> // for uint32
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#include <cstring>
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namespace llarp
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{
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namespace utp
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{
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/// size of keyed hash
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constexpr size_t FragmentHashSize = 32;
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/// size of outer nonce
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constexpr size_t FragmentNonceSize = 32;
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/// size of outer overhead
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constexpr size_t FragmentOverheadSize =
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FragmentHashSize + FragmentNonceSize;
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/// max fragment payload size
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constexpr size_t FragmentBodyPayloadSize = 512;
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/// size of inner nonce
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constexpr size_t FragmentBodyNonceSize = 24;
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/// size of fragment body overhead
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constexpr size_t FragmentBodyOverhead = FragmentBodyNonceSize
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+ sizeof(uint32) + sizeof(uint16_t) + sizeof(uint16_t);
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/// size of fragment body
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constexpr size_t FragmentBodySize =
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FragmentBodyOverhead + FragmentBodyPayloadSize;
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/// size of fragment
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constexpr size_t FragmentBufferSize =
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FragmentOverheadSize + FragmentBodySize;
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static_assert(FragmentBufferSize == 608, "Fragment Buffer Size is not 608");
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/// buffer for a single utp fragment
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using FragmentBuffer = AlignedBuffer< FragmentBufferSize >;
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/// maximum size for send queue for a session before we drop
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constexpr size_t MaxSendQueueSize = 64;
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/// buffer for a link layer message
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using MessageBuffer = AlignedBuffer< MAX_LINK_MSG_SIZE >;
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/// pending inbound message being received
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struct InboundMessage
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{
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/// timestamp of last activity
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llarp_time_t lastActive;
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/// the underlying message buffer
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MessageBuffer _msg;
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/// for accessing message buffer
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llarp_buffer_t buffer;
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/// return true if this inbound message can be removed due to expiration
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bool
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IsExpired(llarp_time_t now) const;
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/// append data at ptr of size sz bytes to message buffer
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/// increment current position
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/// return false if we don't have enough room
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/// return true on success
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bool
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AppendData(const byte_t* ptr, uint16_t sz);
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InboundMessage() : lastActive(0), _msg(), buffer(_msg)
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{
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}
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InboundMessage(const InboundMessage& other)
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: lastActive(other.lastActive), _msg(other._msg), buffer(_msg)
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{
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}
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};
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inline bool
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operator==(const InboundMessage& lhs, const InboundMessage& rhs)
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{
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return lhs.buffer.base == rhs.buffer.base;
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}
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} // namespace utp
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} // namespace llarp
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#endif
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