217 lines
20 KiB
HTML
217 lines
20 KiB
HTML
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<title>Mu - 112read-byte.subx</title>
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<a href='https://github.com/akkartik/mu/blob/main/112read-byte.subx'>https://github.com/akkartik/mu/blob/main/112read-byte.subx</a>
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<pre id='vimCodeElement'>
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<span id="L1" class="LineNr"> 1 </span><span class="subxComment"># Read a single byte from a stream.</span>
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<span id="L2" class="LineNr"> 2 </span><span class="subxComment">#</span>
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<span id="L3" class="LineNr"> 3 </span><span class="subxComment"># We need to do this in machine code because streams need to be opaque types,</span>
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<span id="L4" class="LineNr"> 4 </span><span class="subxComment"># and we don't yet support opaque types in Mu.</span>
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<span id="L5" class="LineNr"> 5 </span>
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<span id="L6" class="LineNr"> 6 </span>== code
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<span id="L7" class="LineNr"> 7 </span><span class="subxComment"># instruction effective address register displacement immediate</span>
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<span id="L8" class="LineNr"> 8 </span><span class="subxS1Comment"># . op subop mod rm32 base index scale r32</span>
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<span id="L9" class="LineNr"> 9 </span><span class="subxS1Comment"># . 1-3 bytes 3 bits 2 bits 3 bits 3 bits 3 bits 2 bits 2 bits 0/1/2/4 bytes 0/1/2/4 bytes</span>
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<span id="L10" class="LineNr"> 10 </span>
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<span id="L11" class="LineNr"> 11 </span><span class="subxComment"># Return next byte value in eax, with top 3 bytes cleared.</span>
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<span id="L12" class="LineNr"> 12 </span><span class="subxComment"># Abort on reaching end of stream.</span>
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<span id="L13" class="LineNr"> 13 </span><span class="subxFunction">read-byte</span>: <span class="subxComment"># s: (addr stream byte) -> result/eax: byte</span>
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<span id="L14" class="LineNr"> 14 </span> <span class="subxS1Comment"># . prologue</span>
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<span id="L15" class="LineNr"> 15 </span> 55/push-ebp
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<span id="L16" class="LineNr"> 16 </span> 89/copy 3/mod/direct 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/r32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy esp to ebp</span>
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<span id="L17" class="LineNr"> 17 </span> <span class="subxS1Comment"># . save registers</span>
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<span id="L18" class="LineNr"> 18 </span> 51/push-ecx
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<span id="L19" class="LineNr"> 19 </span> 56/push-esi
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<span id="L20" class="LineNr"> 20 </span> <span class="subxComment"># esi = s</span>
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<span id="L21" class="LineNr"> 21 </span> 8b/copy 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 6/r32/esi 8/disp8 <span class="Normal"> . </span> <span class="subxComment"># copy *(ebp+8) to esi</span>
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<span id="L22" class="LineNr"> 22 </span> <span class="subxComment"># ecx = s->read</span>
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<span id="L23" class="LineNr"> 23 </span> 8b/copy 1/mod/*+disp8 6/rm32/esi <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 1/r32/ecx 4/disp8 <span class="Normal"> . </span> <span class="subxComment"># copy *(esi+4) to ecx</span>
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<span id="L24" class="LineNr"> 24 </span> <span class="subxComment"># if (f->read >= f->write) abort</span>
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<span id="L25" class="LineNr"> 25 </span> 3b/compare 0/mod/indirect 6/rm32/esi <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 1/r32/ecx <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># compare ecx with *esi</span>
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<span id="L26" class="LineNr"> 26 </span> 0f 8d/jump-if->= $read-byte:<a href='317abort.subx.html#L5'>abort</a>/disp32
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<span id="L27" class="LineNr"> 27 </span> <span class="subxComment"># result = f->data[f->read]</span>
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<span id="L28" class="LineNr"> 28 </span> 31/xor 3/mod/direct 0/rm32/eax <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0/r32/eax <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># clear eax</span>
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<span id="L29" class="LineNr"> 29 </span> 8a/copy-byte 1/mod/*+disp8 4/rm32/sib 6/base/esi 1/index/ecx <span class="Normal"> . </span> 0/r32/AL 0xc/disp8 <span class="Normal"> . </span> <span class="subxComment"># copy byte at *(esi+ecx+12) to AL</span>
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<span id="L30" class="LineNr"> 30 </span> <span class="subxComment"># ++f->read</span>
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<span id="L31" class="LineNr"> 31 </span> ff 0/subop/increment 1/mod/*+disp8 6/rm32/esi <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/disp8 <span class="Normal"> . </span> <span class="subxComment"># increment *(esi+4)</span>
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<span id="L32" class="LineNr"> 32 </span><span class="Constant">$read-byte:end</span>:
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<span id="L33" class="LineNr"> 33 </span> <span class="subxS1Comment"># . restore registers</span>
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<span id="L34" class="LineNr"> 34 </span> 5e/pop-to-esi
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<span id="L35" class="LineNr"> 35 </span> 59/pop-to-ecx
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<span id="L36" class="LineNr"> 36 </span> <span class="subxS1Comment"># . epilogue</span>
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<span id="L37" class="LineNr"> 37 </span> 89/copy 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 5/r32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy ebp to esp</span>
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<span id="L38" class="LineNr"> 38 </span> 5d/pop-to-ebp
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<span id="L39" class="LineNr"> 39 </span> c3/return
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<span id="L40" class="LineNr"> 40 </span>
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<span id="L41" class="LineNr"> 41 </span><span class="Constant">$read-byte:<a href='317abort.subx.html#L5'>abort</a></span>:
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<span id="L42" class="LineNr"> 42 </span> (<a href='317abort.subx.html#L5'>abort</a> <span class="Constant">"read-byte: empty stream"</span>)
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<span id="L43" class="LineNr"> 43 </span> <span class="subxComment"># never gets here</span>
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<span id="L44" class="LineNr"> 44 </span>
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<span id="L45" class="LineNr"> 45 </span><span class="subxComment"># Return next byte value in eax, with top 3 bytes cleared.</span>
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<span id="L46" class="LineNr"> 46 </span><span class="subxComment"># Abort on reaching end of stream.</span>
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<span id="L47" class="LineNr"> 47 </span><span class="subxFunction">peek-byte</span>: <span class="subxComment"># s: (addr stream byte) -> result/eax: byte</span>
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<span id="L48" class="LineNr"> 48 </span> <span class="subxS1Comment"># . prologue</span>
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<span id="L49" class="LineNr"> 49 </span> 55/push-ebp
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<span id="L50" class="LineNr"> 50 </span> 89/copy 3/mod/direct 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/r32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy esp to ebp</span>
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<span id="L51" class="LineNr"> 51 </span> <span class="subxS1Comment"># . save registers</span>
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<span id="L52" class="LineNr"> 52 </span> 51/push-ecx
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<span id="L53" class="LineNr"> 53 </span> 56/push-esi
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<span id="L54" class="LineNr"> 54 </span> <span class="subxComment"># esi = s</span>
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<span id="L55" class="LineNr"> 55 </span> 8b/copy 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 6/r32/esi 8/disp8 <span class="Normal"> . </span> <span class="subxComment"># copy *(ebp+8) to esi</span>
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<span id="L56" class="LineNr"> 56 </span> <span class="subxComment"># ecx = s->read</span>
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<span id="L57" class="LineNr"> 57 </span> 8b/copy 1/mod/*+disp8 6/rm32/esi <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 1/r32/ecx 4/disp8 <span class="Normal"> . </span> <span class="subxComment"># copy *(esi+4) to ecx</span>
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<span id="L58" class="LineNr"> 58 </span> <span class="subxComment"># if (f->read >= f->write) abort</span>
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<span id="L59" class="LineNr"> 59 </span> 3b/compare 0/mod/indirect 6/rm32/esi <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 1/r32/ecx <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># compare ecx with *esi</span>
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<span id="L60" class="LineNr"> 60 </span> 0f 8d/jump-if->= $peek-byte:<a href='317abort.subx.html#L5'>abort</a>/disp32
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<span id="L61" class="LineNr"> 61 </span> <span class="subxComment"># result = f->data[f->read]</span>
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<span id="L62" class="LineNr"> 62 </span> 31/xor 3/mod/direct 0/rm32/eax <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0/r32/eax <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># clear eax</span>
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<span id="L63" class="LineNr"> 63 </span> 8a/copy-byte 1/mod/*+disp8 4/rm32/sib 6/base/esi 1/index/ecx <span class="Normal"> . </span> 0/r32/AL 0xc/disp8 <span class="Normal"> . </span> <span class="subxComment"># copy byte at *(esi+ecx+12) to AL</span>
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<span id="L64" class="LineNr"> 64 </span><span class="Constant">$peek-byte:end</span>:
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<span id="L65" class="LineNr"> 65 </span> <span class="subxS1Comment"># . restore registers</span>
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<span id="L66" class="LineNr"> 66 </span> 5e/pop-to-esi
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<span id="L67" class="LineNr"> 67 </span> 59/pop-to-ecx
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<span id="L68" class="LineNr"> 68 </span> <span class="subxS1Comment"># . epilogue</span>
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<span id="L69" class="LineNr"> 69 </span> 89/copy 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 5/r32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy ebp to esp</span>
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<span id="L70" class="LineNr"> 70 </span> 5d/pop-to-ebp
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<span id="L71" class="LineNr"> 71 </span> c3/return
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<span id="L72" class="LineNr"> 72 </span>
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<span id="L73" class="LineNr"> 73 </span><span class="Constant">$peek-byte:<a href='317abort.subx.html#L5'>abort</a></span>:
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<span id="L74" class="LineNr"> 74 </span> (<a href='317abort.subx.html#L5'>abort</a> <span class="Constant">"peek-byte: empty stream"</span>)
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<span id="L75" class="LineNr"> 75 </span> <span class="subxComment"># never gets here</span>
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<span id="L76" class="LineNr"> 76 </span>
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<span id="L77" class="LineNr"> 77 </span>== data
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<span id="L78" class="LineNr"> 78 </span>
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<span id="L79" class="LineNr"> 79 </span><span class="subxMinorFunction">_test-input-stream</span>: <span class="subxComment"># (stream byte)</span>
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<span id="L80" class="LineNr"> 80 </span> <span class="subxComment"># current write index</span>
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<span id="L81" class="LineNr"> 81 </span> 0/imm32
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<span id="L82" class="LineNr"> 82 </span><span class="Constant">$_test-input-stream->read</span>:
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<span id="L83" class="LineNr"> 83 </span> <span class="subxComment"># current read index</span>
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<span id="L84" class="LineNr"> 84 </span> 0/imm32
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<span id="L85" class="LineNr"> 85 </span> <span class="subxComment"># size</span>
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<span id="L86" class="LineNr"> 86 </span> 0x400/imm32 <span class="subxComment"># 1024 bytes</span>
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<span id="L87" class="LineNr"> 87 </span> <span class="subxComment"># data (64 lines x 16 bytes/line)</span>
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<span id="L88" class="LineNr"> 88 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L89" class="LineNr"> 89 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L90" class="LineNr"> 90 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L91" class="LineNr"> 91 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L92" class="LineNr"> 92 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L93" class="LineNr"> 93 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L94" class="LineNr"> 94 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L95" class="LineNr"> 95 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L96" class="LineNr"> 96 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L97" class="LineNr"> 97 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L98" class="LineNr"> 98 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L99" class="LineNr"> 99 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L100" class="LineNr">100 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L101" class="LineNr">101 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L102" class="LineNr">102 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L103" class="LineNr">103 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L104" class="LineNr">104 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L105" class="LineNr">105 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L106" class="LineNr">106 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L107" class="LineNr">107 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L108" class="LineNr">108 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L109" class="LineNr">109 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L110" class="LineNr">110 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L111" class="LineNr">111 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L112" class="LineNr">112 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L113" class="LineNr">113 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L114" class="LineNr">114 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L115" class="LineNr">115 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L116" class="LineNr">116 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L117" class="LineNr">117 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L118" class="LineNr">118 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L119" class="LineNr">119 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L120" class="LineNr">120 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L121" class="LineNr">121 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L122" class="LineNr">122 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L123" class="LineNr">123 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L124" class="LineNr">124 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L125" class="LineNr">125 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L126" class="LineNr">126 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L127" class="LineNr">127 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L128" class="LineNr">128 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L129" class="LineNr">129 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L130" class="LineNr">130 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L131" class="LineNr">131 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L132" class="LineNr">132 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L133" class="LineNr">133 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L134" class="LineNr">134 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L135" class="LineNr">135 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L136" class="LineNr">136 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L137" class="LineNr">137 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L138" class="LineNr">138 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L139" class="LineNr">139 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L140" class="LineNr">140 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L141" class="LineNr">141 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L142" class="LineNr">142 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L143" class="LineNr">143 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L144" class="LineNr">144 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L145" class="LineNr">145 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L146" class="LineNr">146 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L147" class="LineNr">147 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L148" class="LineNr">148 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L149" class="LineNr">149 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L150" class="LineNr">150 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L151" class="LineNr">151 </span> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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<span id="L152" class="LineNr">152 </span>
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<span id="L153" class="LineNr">153 </span><span class="subxS2Comment"># . . vim:nowrap:textwidth=0</span>
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</pre>
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</body>
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</html>
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