eth_checksum.h

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// Copyright 2021-2025 The Aerospace Corporation.
// This file is a part of SatCat5, licensed under CERN-OHL-W v2 or later.
 
#pragma once
 
#include <satcat5/codec_slip.h>
#include <satcat5/io_buffer.h>
#include <satcat5/io_checksum.h>
 
namespace satcat5 {
    namespace eth {
        u32 crc32(unsigned nbytes, const void* data);
 
        u32 crc32(satcat5::io::Readable* src);
 
        class ChecksumTx : public satcat5::io::ChecksumTx<u32,4> {
        public:
            explicit ChecksumTx(satcat5::io::Writeable* dst);
 
            // Implement required API from Writeable:
            bool write_finalize() override;
 
        private:
            // Implement required API from Writeable:
            void write_next(u8 data) override;
        };
 
        class ChecksumRx : public satcat5::io::ChecksumRx<u32,4> {
        public:
            explicit ChecksumRx(satcat5::io::Writeable* dst);
 
            // Implement required API from Writeable:
            bool write_finalize() override;
 
        private:
            // Implement required API from Writeable:
            void write_next(u8 data) override;
        };
 
        class SlipCodec
            : public satcat5::io::ReadableRedirect
            , public satcat5::eth::ChecksumTx
        {
        public:
            SlipCodec(
                satcat5::io::Writeable* dst,
                satcat5::io::Readable* src);
 
            inline satcat5::io::TrafficStats stats()
                { return satcat5::io::TrafficStats::query(m_rx_fcs, *this); }
 
        protected:
            satcat5::io::SlipEncoder m_tx_slip;     
            satcat5::io::BufferedCopy m_rx_copy;    
            satcat5::io::SlipDecoder m_rx_slip;     
            satcat5::eth::ChecksumRx m_rx_fcs;      
            satcat5::io::PacketBuffer m_rx_buff;    
            u8 m_rawbuff[SATCAT5_SLIP_BUFFSIZE];    
        };
 
        class SlipCodecInverse
            : public satcat5::io::ReadableRedirect
            , public satcat5::io::SlipDecoder
        {
        public:
            SlipCodecInverse(
                satcat5::io::Writeable* dst,
                satcat5::io::Readable* src);
 
            inline satcat5::io::TrafficStats stats()
                { return satcat5::io::TrafficStats::query(m_rx_fcs, m_tx_fcs); }
 
        protected:
            satcat5::eth::ChecksumRx m_rx_fcs;      
            satcat5::io::BufferedCopy m_tx_copy;    
            satcat5::eth::ChecksumTx m_tx_fcs;      
            satcat5::io::SlipEncoder m_tx_slip;     
            satcat5::io::PacketBuffer m_tx_buff;    
            u8 m_rawbuff[SATCAT5_SLIP_BUFFSIZE];    
        };
    }
}