15th day and 16th day WIP :(

2021-12-16 21:18:02 +01:00
parent e3494e234a
commit 223863aa1f
8 changed files with 299 additions and 0 deletions
--- a/16/part1.php
+++ b/16/part1.php
@@ -0,0 +1,101 @@
+<?php
+
+$input = file('input', FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
+$input = str_split($input[0]);
+
+$bin = '';
+foreach ($input as $char) {
+    $bin .= str_pad(base_convert($char, 16, 2), 4, '0', STR_PAD_LEFT);
+}
+print_r(decodeString($bin));
+//decodeString($bin);
+
+
+function decodeString($binaryString, $offset = 0)
+{
+    $data = [];
+    $data['maxoffset'] = $offset;
+    echo str_repeat(' ', $offset) . $binaryString . "\n";
+    echo str_repeat(' ', $offset) . substr($binaryString, 0, 3) . "\n";
+    echo str_repeat(' ', $offset + 3) . substr($binaryString, 3, 3) . "\n";
+    $data['version'] = bindec(substr($binaryString, 0, 3));
+    $data['type'] = bindec(substr($binaryString, 3, 3));
+    if ($data['type'] == 4) {
+        $isLast = 0;
+        $bitNumber = 0;
+        $literalValue = '';
+        $position = 6;
+        while (!$isLast) {
+            $position = 6 + $bitNumber * 5;
+            echo str_repeat(' ', $offset + $position) . substr($binaryString, $position, 5) . "\n";
+            $data['maxoffset'] = $offset + $position + 5;
+            $binaryBit = substr($binaryString, $position, 5);
+            $literalValue .= substr($binaryBit, 1, 4);
+            $isLast = !$binaryBit[0];
+            $bitNumber++;
+        }
+
+        $data['literalValue'] = bindec($literalValue);
+        $position += 5;
+//        if ($nesting > 2) {
+////            print_r($binaryString);
+////            echo 1;
+////            die(print_r($data, 1));
+//        }
+        if (strlen($binaryString) - $position > 10) {
+            $data['subpacket'] = [];
+
+            $decoded = decodeString(substr($binaryString, $position), $offset + $position);
+            if ($data['maxoffset'] < $decoded['maxoffset']) {
+                $data['maxoffset'] = $decoded['maxoffset'];
+            }
+            $data['subpacket'][] = $decoded;
+
+        }
+    } else {
+        $data['lengthTypeId'] = bindec(substr($binaryString, 6, 1));
+        echo str_repeat(' ', $offset + 6) . substr($binaryString, 6, 1) . "\n";
+        if ($data['lengthTypeId']) {
+            $data['numberOfPackets'] = bindec(substr($binaryString, 7, 11));
+            echo str_repeat(' ', $offset + 7) . substr($binaryString, 7, 11) . "\n";
+            $bin = substr($binaryString, 18);
+            $data['subpacket'] = [];
+//            if ($nesting > 2) {
+////                print_r($binaryString);
+////                echo 2;
+////                die(print_r($data, 1));
+//            }
+            for ($i = 0; $i < $data['numberOfPackets']; $i++) {
+                $decoded = decodeString($bin, $offset + 18);
+                if ($data['maxoffset'] < $decoded['maxoffset']) {
+                    $data['maxoffset'] = $decoded['maxoffset'];
+                    $offset = $data['maxoffset']-18;
+                }
+                $data['subpacket'][] = $decoded;
+                $bin = substr($bin, $data['maxoffset']);
+            }
+//            $data['subpacket'][] = decodeString($bin, $offset + 18);
+        } else {
+            $data['totalLengthOfPackets'] = bindec(substr($binaryString, 7, 15));
+            $bin = substr($binaryString, 22, $data['totalLengthOfPackets']);
+            echo str_repeat(' ', $offset + 7) . substr($binaryString, 7, 15) . "\n";
+            $data['subpacket'] = [];
+//            if ($nesting > 2) {
+////                echo 3;
+////                die(print_r($data, 1));
+//            }
+            $decoded = decodeString($bin, $offset + 22);
+            if ($data['maxoffset'] < $decoded['maxoffset']) {
+                $data['maxoffset'] = $decoded['maxoffset'];
+            }
+            $data['subpacket'][] = $decoded;
+        }
+    }
+    return $data;
+}
+//echo chr(bindec('01010000001'));
+//8A004A801A8002F478 represents an operator packet
+// (version 4) which contains an operator packet
+// (version 1) which contains an operator packet
+// (version 5) which contains a literal value
+// (version 6); this packet has a version sum of 16.