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<?php

$chunk_size_kb=128;

$chunk_size=$chunk_size_kb*1024;

$file1=$argv[1]??"file1";

$file2=$argv[2]??"file2";

$output=$argv[3]??"output";

if(!file_exists($file1))

{

echo $file1." does not exist\n";

exit;

}

if(!file_exists($file2))

{

echo $file2." does not exist\n";

exit;

}

if(file_exists($output))

{

echo $output." already exists, refusing to replace\n";

exit;

}

function writeBestChunk($chunk1,$chunk2,$out,$total_size,$chunk_size,$scale,&$bytes_read,&$chunks)

{

global $last_progress_bar, $progress_width, $progress_chars, $progress_chars_count;

if(strlen(trim($chunk1,"\x00")))

{

if(strlen(trim($chunk2,"\x00")))

{

if($chunk1===$chunk2)

{

$chunks['equal']+=$scale;

fwrite($out,$chunk1);

$bytes_read+=strlen($chunk1);

}

else

{

$newChunk_size=floor($chunk_size/128);

if($newChunk_size>=1024)

{

$newchunks1=str_split($chunk1,$newChunk_size);

$newchunks2=str_split($chunk2,$newChunk_size);

foreach(range(0,max(count($newchunks1),count($newchunks2))-1) as $n)

{

writeBestChunk($newchunks1[$n],$newchunks2[$n],$out,$total_size,$newChunk_size,1/128,$bytes_read,$chunks);

}

}

else

{

$chunks['different']+=$scale;

echo "\n\e[1;33mChunks from ".strtoupper(dechex($bytes_read))." are different\e[0m\n";

fwrite($out,$chunk1);

$bytes_read+=strlen($chunk1);

}

}

}

else

{

$chunks['copied1']+=$scale;

fwrite($out,$chunk1);

$bytes_read+=strlen($chunk1);

}

}

elseif(strlen(trim($chunk2,"\x00")))

{

$chunks['copied2']+=$scale;

fwrite($out,$chunk2);

$bytes_read+=strlen($chunk2);

}

elseif($chunk1||$chunk2)

{

$chunks['both_zero']+=$scale;

fwrite($out,$chunk1);

$bytes_read+=strlen($chunk1);

}

$progress=$bytes_read/$total_size;

$progress_percent=round($progress*100);

if($progress>=0&&$progress<=1)

{

$progress_bar=str_repeat($progress_chars[0],round($progress*$progress_width));

$progress_bar.=$progress_chars[min(1,(int)($progress*$progress_width*$progress_chars_count))];

$progress_bar.=str_repeat($progress_chars[$progress_chars_count-1],max(0,$progress_width-strlen($progress_bar)));

}

else

{

$progress_bar=str_repeat($progress_chars[$progress_chars_count-1],$progress_width);

}

if($progress_bar!=($last_progress_bar??null))

{

echo "\r[$progress_bar] $progress_percent%";

$last_progress_bar=$progress_bar;

}

}

$file_size1=filesize($file1);

$file_size2=filesize($file2);

$total_size=max($file_size1,$file_size2);

$bytes_read=0;

$chunks=[

'copied1'=>0,

'copied2'=>0,

'equal'=>0,

'different'=>0,

'both_zero'=>0,

];

$f1=fopen($file1,'rb');

$f2=fopen($file2,'rb');

$out=fopen($output,'wb');

$progress_width=trim(shell_exec("tput cols"))-8;

$progress_chars=['=','>',' '];

$progress_chars_count=count($progress_chars);

echo "[".str_repeat(' ',$progress_width)."] 0%";

while(true)

{

$chunk1=fread($f1,$chunk_size);

$chunk2=fread($f2,$chunk_size);

if(!$chunk1&&!$chunk2)

{

break;

}

writeBestChunk($chunk1,$chunk2,$out,$total_size,$chunk_size,1,$bytes_read,$chunks);

}

fclose($f1);

fclose($f2);

fclose($out);

echo "\nProgress: 100%\n";

echo "Chunks only in $file1: ".$chunks['copied1']."\n";

echo "Chunks only in $file2: ".$chunks['copied2']."\n";

echo "Chunks equal: ".$chunks['equal']."\n";

echo "Chunks different: ".$chunks['different']."\n";

echo "Chunks both zero: ".$chunks['both_zero']."\n";

?>