101 lines
3.9 KiB
PHP
101 lines
3.9 KiB
PHP
<?php
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$input = file('input', FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
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$input = str_split($input[0]);
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$bin = '';
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foreach ($input as $char) {
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$bin .= str_pad(base_convert($char, 16, 2), 4, '0', STR_PAD_LEFT);
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}
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print_r(decodeString($bin));
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//decodeString($bin);
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function decodeString($binaryString, $offset = 0)
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{
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$data = [];
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$data['maxoffset'] = $offset;
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echo str_repeat(' ', $offset) . $binaryString . "\n";
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echo str_repeat(' ', $offset) . substr($binaryString, 0, 3) . "\n";
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echo str_repeat(' ', $offset + 3) . substr($binaryString, 3, 3) . "\n";
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$data['version'] = bindec(substr($binaryString, 0, 3));
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$data['type'] = bindec(substr($binaryString, 3, 3));
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if ($data['type'] == 4) {
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$isLast = 0;
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$bitNumber = 0;
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$literalValue = '';
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$position = 6;
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while (!$isLast) {
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$position = 6 + $bitNumber * 5;
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echo str_repeat(' ', $offset + $position) . substr($binaryString, $position, 5) . "\n";
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$data['maxoffset'] = $offset + $position + 5;
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$binaryBit = substr($binaryString, $position, 5);
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$literalValue .= substr($binaryBit, 1, 4);
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$isLast = !$binaryBit[0];
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$bitNumber++;
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}
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$data['literalValue'] = bindec($literalValue);
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$position += 5;
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// if ($nesting > 2) {
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//// print_r($binaryString);
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//// echo 1;
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//// die(print_r($data, 1));
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// }
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if (strlen($binaryString) - $position > 10) {
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$data['subpacket'] = [];
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$decoded = decodeString(substr($binaryString, $position), $offset + $position);
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if ($data['maxoffset'] < $decoded['maxoffset']) {
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$data['maxoffset'] = $decoded['maxoffset'];
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}
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$data['subpacket'][] = $decoded;
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}
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} else {
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$data['lengthTypeId'] = bindec(substr($binaryString, 6, 1));
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echo str_repeat(' ', $offset + 6) . substr($binaryString, 6, 1) . "\n";
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if ($data['lengthTypeId']) {
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$data['numberOfPackets'] = bindec(substr($binaryString, 7, 11));
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echo str_repeat(' ', $offset + 7) . substr($binaryString, 7, 11) . "\n";
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$bin = substr($binaryString, 18);
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$data['subpacket'] = [];
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// if ($nesting > 2) {
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//// print_r($binaryString);
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//// echo 2;
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//// die(print_r($data, 1));
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// }
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for ($i = 0; $i < $data['numberOfPackets']; $i++) {
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$decoded = decodeString($bin, $offset + 18);
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if ($data['maxoffset'] < $decoded['maxoffset']) {
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$data['maxoffset'] = $decoded['maxoffset'];
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$offset = $data['maxoffset']-18;
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}
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$data['subpacket'][] = $decoded;
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$bin = substr($bin, $data['maxoffset']);
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}
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// $data['subpacket'][] = decodeString($bin, $offset + 18);
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} else {
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$data['totalLengthOfPackets'] = bindec(substr($binaryString, 7, 15));
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$bin = substr($binaryString, 22, $data['totalLengthOfPackets']);
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echo str_repeat(' ', $offset + 7) . substr($binaryString, 7, 15) . "\n";
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$data['subpacket'] = [];
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// if ($nesting > 2) {
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//// echo 3;
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//// die(print_r($data, 1));
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// }
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$decoded = decodeString($bin, $offset + 22);
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if ($data['maxoffset'] < $decoded['maxoffset']) {
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$data['maxoffset'] = $decoded['maxoffset'];
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}
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$data['subpacket'][] = $decoded;
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}
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}
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return $data;
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}
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//echo chr(bindec('01010000001'));
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//8A004A801A8002F478 represents an operator packet
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// (version 4) which contains an operator packet
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// (version 1) which contains an operator packet
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// (version 5) which contains a literal value
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// (version 6); this packet has a version sum of 16.
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