#54 Fix null terminated string decoding (#56)

Author: alexeevdv

src/Protocol.php

@@ -58,7 +58,7 @@ function encoder(int $protocolVersion): callable
 function decode(string $binaryString): Either
 {
     $packedFormat = \sprintf(
-        'C%s/N%s/A*%s',
+        'C%s/N%s/a*%s',
         PROTOCOL_ACCESSOR_VERSION,
         PROTOCOL_ACCESSOR_SCHEMA_ID,
         PROTOCOL_ACCESSOR_AVRO

test/ProtocolTest.php

@@ -23,6 +23,9 @@
 
 class ProtocolTest extends AbstractFunctionalTestCase
 {
+    private const NULL_TERMINATED_HEX = '000000270f303000000000';
+    private const NULL_TERMINATED_AVRO_HEX = '303000000000';
+
     /**
      * @test
      */
@@ -149,4 +152,21 @@ public function validate_returns_nothing_for_invalid_unpacked(): void
 
         $this->assertInstanceOf(Nothing::class, validate(WIRE_FORMAT_PROTOCOL_VERSION, $decoded));
     }
+
+    /**
+     * @test
+     */
+    public function null_terminated_values_unpacked_correctly(): void
+    {
+        $decoded = decode(\hex2bin(self::NULL_TERMINATED_HEX));
+
+        $this->assertInstanceOf(Right::class, $decoded);
+
+        $unpacked = $decoded->extract();
+
+        $this->assertIsArray($unpacked);
+        $this->assertSame(WIRE_FORMAT_PROTOCOL_VERSION, $unpacked[PROTOCOL_ACCESSOR_VERSION]);
+        $this->assertSame(self::SCHEMA_ID, $unpacked[PROTOCOL_ACCESSOR_SCHEMA_ID]);
+        $this->assertSame(self::NULL_TERMINATED_AVRO_HEX, \bin2hex($unpacked[PROTOCOL_ACCESSOR_AVRO]));
+    }
 }