engine/mysql: remove bitfield implementation as it's not used

src/engine/Model.php

@@ -92,11 +92,6 @@ abstract class Model
                     $model_upd[$field->getModelName()] = $value;
                     break;
 
-                case ModelFieldType::BITFIELD:
-                    $db_upd[$name] = $value;
-                    $model_upd[$field->getModelName()] = $value;
-                    break;
-
                 default:
                     $value = (string)$value;
                     $db_upd[$name] = $value;
@@ -179,9 +174,6 @@ abstract class Model
                     case 'bool':
                         $mytype = ModelFieldType::BOOLEAN;
                         break;
-                    case 'mysql_bitfield':
-                        $mytype = ModelFieldType::BITFIELD;
-                        break;
                     default:
                         if (enum_exists($typename)) {
                             $mytype = ModelFieldType::BACKED_ENUM;

src/engine/ModelFieldType.php

@@ -11,6 +11,5 @@ enum ModelFieldType
     case BOOLEAN;
     case JSON;
     case SERIALIZED;
-    case BITFIELD;
     case BACKED_ENUM;
 }

src/engine/ModelProperty.php

@@ -57,9 +57,6 @@ class ModelProperty
                     $val = null;
                 return $val;
 
-            case ModelFieldType::BITFIELD:
-                return new MySQLBitField($value);
-
             case ModelFieldType::BACKED_ENUM:
                 try {
                     return $this->realType::from($value);

src/engine/MySQLBitField.php

@@ -1,65 +0,0 @@
-<?php
-
-namespace engine;
-
-use Exception;
-use GMP;
-
-class MySQLBitField
-{
-    private GMP $value;
-    private int $size;
-
-    public function __construct($value, int $size = 64) {
-        $this->value = gmp_init($value);
-        $this->size = $size;
-    }
-
-    /**
-     * @throws Exception
-     */
-    public function has(int $bit): bool {
-        $this->validateBit($bit);
-        return gmp_testbit($this->value, $bit);
-    }
-
-    /**
-     * @throws Exception
-     */
-    public function set(int $bit): void {
-        $this->validateBit($bit);
-        gmp_setbit($this->value, $bit);
-    }
-
-    /**
-     * @throws Exception
-     */
-    public function clear(int $bit): void {
-        $this->validateBit($bit);
-        gmp_clrbit($this->value, $bit);
-    }
-
-    public function isEmpty(): bool {
-        return !gmp_cmp($this->value, 0);
-    }
-
-    public function __toString(): string {
-        $buf = '';
-        for ($bit = $this->size - 1; $bit >= 0; --$bit)
-            $buf .= gmp_testbit($this->value, $bit) ? '1' : '0';
-        if (($pos = strpos($buf, '1')) !== false) {
-            $buf = substr($buf, $pos);
-        } else {
-            $buf = '0';
-        }
-        return $buf;
-    }
-
-    /**
-     * @throws Exception
-     */
-    private function validateBit(int $bit): void {
-        if ($bit < 0 || $bit >= $this->size)
-            throw new Exception('invalid bit ' . $bit . ', allowed range: [0..' . $this->size . ')');
-    }
-}