Squashed commit of the following:

commit 06aff1983a77c87ce782280e5d9a2e04130f1641
Author: puklipo <pcs.engineer.team@gmail.com>
Date:   Wed Dec 11 19:59:06 2024 +0900

    Update composer.json

commit e3ea075725d2ba96a079fc9aad317a6df0fdb574
Merge: d5df7c8 0177764
Author: puklipo <pcs.engineer.team@gmail.com>
Date:   Wed Dec 11 19:58:14 2024 +0900

    Merge branch 'main' into cid

commit d5df7c8145f1474dbee3ab344419e90bdaa1e5b3
Author: puklipo <pcs.engineer.team@gmail.com>
Date:   Wed Dec 11 19:55:36 2024 +0900

    Update CID.php

commit 9c8755be17e325d198c28508ce0e0ca491f5d7a0
Author: puklipo <pcs.engineer.team@gmail.com>
Date:   Wed Dec 11 19:55:31 2024 +0900

    Update composer.json

commit 7e6fd2a
Author: puklipo <pcs.engineer.team@gmail.com>
Date:   Wed Dec 11 16:25:30 2024 +0900

    Update SupportTest.php

commit 0381f06
Author: puklipo <pcs.engineer.team@gmail.com>
Date:   Wed Dec 11 16:25:26 2024 +0900

    Update CID.php

commit 0a224e5
Author: puklipo <pcs.engineer.team@gmail.com>
Date:   Wed Dec 11 15:50:05 2024 +0900

    CID

    Update SupportTest.php

composer.json

@@ -20,8 +20,7 @@
         "revolution/atproto-lexicon-contracts": "1.0.36",
         "valtzu/guzzle-websocket-middleware": "^0.2.0",
         "yocto/yoclib-multibase": "^1.2",
-        "jetbrains/phpstorm-attributes": "^1.2",
-        "team-acaisia/php-varint": "^1.0"
+        "jetbrains/phpstorm-attributes": "^1.2"
     },
     "require-dev": {
         "orchestra/testbench": "^9.0",

src/Support/CID.php

@@ -4,7 +4,6 @@
 
 namespace Revolution\Bluesky\Support;
 
-use Acaisia\Multiformats\Varint\Varint;
 use YOCLIB\Multiformats\Multibase\Multibase;
 
 /**
@@ -16,7 +15,7 @@ class CID
 {
     public const CID_V1 = "\x01";
 
-    protected const SHA256 = "\x12";
+    protected const SHA2_256 = "\x12";
 
     public const RAW = "\x55";
 
@@ -36,8 +35,8 @@ public static function encode(string $data, string $codec = self::RAW): string
         $hash = hash(algo: 'sha256', data: $data, binary: true);
         $hash_length = strlen($hash);
 
-        $varint_hash = (string) Varint::fromInteger(intval(bin2hex(self::SHA256), 16))->toByteArray();
-        $varint_length = (string) Varint::fromInteger($hash_length)->toByteArray();
+        $varint_hash = self::varint(intval(bin2hex(self::SHA2_256), 16));
+        $varint_length = self::varint($hash_length);
         $varint = $varint_hash.$varint_length;
 
         $bytes = self::CID_V1.$codec.$varint.$hash;
@@ -88,4 +87,20 @@ public static function decode(string $cid): array
             'hash',
         );
     }
+
+    protected static function varint(int $x): string
+    {
+        $buf = [];
+        $i = 0;
+
+        while ($x >= 0x80) {
+            $buf[$i] = $x & 0xFF | 0x80;
+            $x = $x >> 7;
+            $i++;
+        }
+
+        $buf[$i] = $x & 0xFF;
+
+        return pack("C*", ...$buf);
+    }
 }