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< pre style = " font-family:monospace;font-size:12pt " >
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< a name = " l1 " > < / a > < span class = cF1 > class < / span > < span class = cF0 > CEthernetFrame
< a name = " l2 " > < / a > {
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< a name = " l3 " > < / a > < / span > < span class = cF1 > U8 < / span > < span class = cF0 > source_address [ < / span > < span class = cFE > 6 < / span > < span class = cF0 > ] ;
< a name = " l4 " > < / a > < / span > < span class = cF1 > U8 < / span > < span class = cF0 > padding [ < / span > < span class = cFE > 2 < / span > < span class = cF0 > ] ;
< a name = " l5 " > < / a > < / span > < span class = cF1 > U8 < / span > < span class = cF0 > destination_address [ < / span > < span class = cFE > 6 < / span > < span class = cF0 > ] ;
< a name = " l6 " > < / a > < / span > < span class = cF9 > U16 < / span > < span class = cF0 > ethertype ;
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< a name = " l7 " > < / a >
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< a name = " l8 " > < / a > < / span > < span class = cF1 > U8 < / span > < span class = cF0 > * data ;
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< a name = " l9 " > < / a >
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< a name = " l10 " > < / a > < / span > < span class = cF9 > I64 < / span > < span class = cF0 > length ;
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< a name = " l11 " > < / a > } ;
< a name = " l12 " > < / a >
< a name = " l13 " > < / a > < / span > < span class = cF1 > class < / span > < span class = cF0 > CEthernetGlobals
< a name = " l14 " > < / a > {
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< a name = " l15 " > < / a > < / span > < span class = cF1 > U8 < / span > < span class = cF0 > ethernet_null [ < / span > < span class = cFE > 6 < / span > < span class = cF0 > ] ;
< a name = " l16 " > < / a > < / span > < span class = cF1 > U8 < / span > < span class = cF0 > ethernet_broadcast [ < / span > < span class = cFE > 6 < / span > < span class = cF0 > ] ;
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< a name = " l17 " > < / a >
< a name = " l18 " > < / a > } ethernet_globals ;
< a name = " l19 " > < / a >
< a name = " l20 " > < / a > < / span > < span class = cF1 > U0 < / span > < span class = cF0 > EthernetGlobalsInit ( )
< a name = " l21 " > < / a > {
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< a name = " l22 " > < / a > < / span > < span class = cF9 > I64 < / span > < span class = cF0 > i ;
< a name = " l23 " > < / a > < / span > < span class = cF1 > for < / span > < span class = cF0 > ( i = < / span > < span class = cFE > 0 < / span > < span class = cF0 > ; i & lt ; < / span > < span class = cFE > 6 < / span > < span class = cF0 > ; i + + )
< a name = " l24 " > < / a > < / span > < span class = cF7 > { < / span > < span class = cF0 >
< a name = " l25 " > < / a > ethernet_globals . ethernet_null [ i ] = < / span > < span class = cFE > 0 < / span > < span class = cF0 > ;
< a name = " l26 " > < / a > ethernet_globals . ethernet_broadcast [ i ] = < / span > < span class = cFE > 0xFF < / span > < span class = cF0 > ;
< a name = " l27 " > < / a > < / span > < span class = cF7 > } < / span > < span class = cF0 >
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< a name = " l28 " > < / a > }
< a name = " l29 " > < / a >
< a name = " l30 " > < / a > < / span > < span class = cF2 > //TODO: check length , figure out the length+4 </span><span class=cF0>
< a name = " l31 " > < / a > < / span > < span class = cF1 > U0 < / span > < span class = cF0 > EthernetFrameParse ( CEthernetFrame * frame_out , < / span > < span class = cF1 > U8 < / span > < span class = cF0 > * frame , < / span > < span class = cF9 > U16 < / span > < span class = cF0 > length )
< a name = " l32 " > < / a > {
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< a name = " l33 " > < / a > < / span > < span class = cF2 > //TODO: Check length ! We need to figure out what</span><span class=cF0>
< a name = " l34 " > < / a > < / span > < span class = cF2 > //lengths are appropriate ...... Shrine also says MemCopy has a</span><span class=cF0>
< a name = " l35 " > < / a > < / span > < span class = cF2 > //high overhead. I'm almost tempted to say that means that a lot</span><span class=cF0>
< a name = " l36 " > < / a > < / span > < span class = cF2 > //of the current system should be done with less extra allocation</span><span class=cF0>
< a name = " l37 " > < / a > < / span > < span class = cF2 > //altogether, more passing.</span><span class=cF0>
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< a name = " l38 " > < / a >
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< a name = " l39 " > < / a > NetLog ( < / span > < span class = cF6 > & quot ; ETHERNET FRAME PARSE : Parsing frame , copying out to frame_out param . & quot ; < / span > < span class = cF0 > ) ;
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< a name = " l40 " > < / a >
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< a name = " l41 " > < / a > < / span > < span class = cF5 > MemCopy < / span > < span class = cF0 > ( frame_out - & gt ; destination_address , frame , MAC_ADDRESS_LENGTH ) ;
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< a name = " l42 " > < / a >
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< a name = " l43 " > < / a > < / span > < span class = cF5 > MemCopy < / span > < span class = cF0 > ( frame_out - & gt ; source_address , frame + MAC_ADDRESS_LENGTH , MAC_ADDRESS_LENGTH ) ;
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< a name = " l44 " > < / a >
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< a name = " l45 " > < / a > frame_out - & gt ; ethertype = frame [ ETHERNET_ETHERTYPE_OFFSET + < / span > < span class = cFE > 1 < / span > < span class = cF0 > ] | frame [ ETHERNET_ETHERTYPE_OFFSET ] & lt ; & lt ; < / span > < span class = cFE > 8 < / span > < span class = cF0 > ;
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< a name = " l46 " > < / a >
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< a name = " l47 " > < / a > frame_out - & gt ; data = frame + ETHERNET_DATA_OFFSET ;
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< a name = " l48 " > < / a >
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< a name = " l49 " > < / a > frame_out - & gt ; length = length - ETHERNET_MAC_HEADER_LENGTH - < / span > < span class = cFE > 4 < / span > < span class = cF0 > ; < / span > < span class = cF2 > // He has a comment literally just saying "??". + or - 4?</span><span class=cF0>
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< a name = " l50 " > < / a > }
< a name = " l51 " > < / a >
< a name = " l52 " > < / a > EthernetGlobalsInit ; < / span > < / pre > < / body >
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