Better resource guarding.

Changelog.md

@@ -131,3 +131,5 @@ __*Why "v3.0.0" instead of "v1.0.0?"*__ Prior to phpMussel v3, the "phpMussel Co
 [2023.09.04; Maikuolan]: Added colouration to phpMussel's CLI mode (some code has been added to the core to facilitate this). The atHit method has been migrated from the Loader class to the Scanner class.
 
 [2023.09.16~18; Maikuolan]: Significantly refactored all L10N data.
+
+[2023.09.18; Maikuolan]: Better resource guarding.

src/Loader.php

@@ -8,7 +8,7 @@
  * License: GNU/GPLv2
  * @see LICENSE.txt
  *
- * This file: The loader (last modified: 2023.09.17).
+ * This file: The loader (last modified: 2023.09.18).
  */
 
 namespace phpMussel\Core;
@@ -410,12 +410,12 @@ public function __construct(
                 $WriteMode = 'ab';
                 $Data = $this->InstanceCache['PendingErrorLogData'];
             }
-            $Handle = fopen($File, $WriteMode);
-            if (is_resource($Handle)) {
-                fwrite($Handle, $Data);
-                fclose($Handle);
-                $this->logRotation($this->Configuration['core']['error_log']);
+            if (!is_resource($Handle = fopen($File, $WriteMode))) {
+                return false;
             }
+            fwrite($Handle, $Data);
+            fclose($Handle);
+            $this->logRotation($this->Configuration['core']['error_log']);
             return true;
         });
 
@@ -476,8 +476,7 @@ public function readFile(string $File): string
             return '';
         }
 
-        $Handle = fopen($File, 'rb');
-        if (!is_resource($Handle)) {
+        if (!is_resource($Handle = fopen($File, 'rb'))) {
             return '';
         }
         $Data = fread($Handle, $Filesize);
@@ -960,8 +959,7 @@ public function readFileContentGZ(string $File): string
 
         $Data = '';
         if ($BlocksToRead > 0) {
-            $Handle = gzopen($File, 'rb');
-            if (!is_resource($Handle)) {
+            if (!is_resource($Handle = gzopen($File, 'rb'))) {
                 return '';
             }
             $Done = 0;
@@ -1041,12 +1039,7 @@ public function gZCompressFile(string $File): bool
             return false;
         }
 
-        $Handle = fopen($File, 'rb');
-        if (!is_resource($Handle)) {
-            return false;
-        }
-        $HandleGZ = gzopen($File . '.gz', 'wb');
-        if (!is_resource($HandleGZ)) {
+        if (!is_resource($Handle = fopen($File, 'rb')) || !is_resource($HandleGZ = gzopen($File . '.gz', 'wb'))) {
             return false;
         }
         while (!feof($Handle)) {
@@ -1237,8 +1230,7 @@ public function updateConfiguration(): bool
         } else {
             return false;
         }
-        $Handle = fopen($this->ConfigurationPath, 'wb');
-        if (!is_resource($Handle)) {
+        if (!is_resource($Handle = fopen($this->ConfigurationPath, 'wb'))) {
             return false;
         }
         $Err = fwrite($Handle, $Reconstructed);

src/Scanner.php

@@ -8,7 +8,7 @@
  * License: GNU/GPLv2
  * @see LICENSE.txt
  *
- * This file: The scanner (last modified: 2023.09.04).
+ * This file: The scanner (last modified: 2023.09.18).
  */
 
 namespace phpMussel\Core;
@@ -108,7 +108,10 @@ public function __construct(\phpMussel\Core\Loader &$Loader)
             ]) . "\n";
             $Truncate = $this->Loader->readBytes($this->Loader->Configuration['core']['truncate']);
             $WriteMode = (!file_exists($File) || ($Truncate > 0 && filesize($File) >= $Truncate)) ? 'wb' : 'ab';
-            $Stream = fopen($File, $WriteMode);
+            if (!is_resource($Stream = fopen($File, $WriteMode))) {
+                trigger_error('The "writeToSerialLog" event failed to open "' . $File . '" for writing.');
+                return false;
+            }
             fwrite($Stream, $Data);
             fclose($Stream);
             $this->Loader->logRotation($this->Loader->Configuration['core']['scan_log_serialized']);
@@ -146,7 +149,10 @@ public function __construct(\phpMussel\Core\Loader &$Loader)
                 $Truncate = $this->Loader->readBytes($this->Loader->Configuration['core']['truncate']);
                 $WriteMode = ($Truncate > 0 && filesize($File) >= $Truncate) ? 'wb' : 'ab';
             }
-            $Handle = fopen($File, 'ab');
+            if (!is_resource($Handle = fopen($File, 'ab'))) {
+                trigger_error('The "writeToScanLog" event failed to open "' . $File . '" for writing.');
+                return false;
+            }
             fwrite($Handle, $Results);
             fclose($Handle);
             $this->Loader->logRotation($this->Loader->Configuration['core']['scan_log']);