Fix phar instrumentation

And check for dependencies in example targets.

example/target_css_parser.php

@@ -2,7 +2,13 @@
 
 /** @var PhpFuzzer\Fuzzer $fuzzer */
 
-require __DIR__ . '/PHP-CSS-Parser/vendor/autoload.php';
+$autoload = __DIR__ . '/PHP-CSS-Parser/vendor/autoload.php';
+if (!file_exists($autoload)) {
+    echo "Cannot find PHP-CSS-Parser installation in " . __DIR__ . "/PHP-CSS_Parser\n";
+    exit(1);
+}
+
+require $autoload;
 
 $fuzzer->setTarget(function(string $input) {
     $parser = new Sabberworm\CSS\Parser($input);

example/target_php_parser.php

@@ -1,17 +1,28 @@
 <?php declare(strict_types=1);
 
-// This only works with php-fuzzer.phar, which uses a prefixed version of php-parser!
-
 /** @var PhpFuzzer\Fuzzer $fuzzer */
 
-$fuzzer->setMaxLen(1024);
-$fuzzer->addDictionary(__DIR__ . '/php.dict');
+if (class_exists(PhpParser\Parser\Php7::class)) {
+    echo "The PHP-Parser target can only be used with php-fuzzer.phar,\n";
+    echo "otherwise there is a conflict with php-fuzzer's own use of PHP-Parser.\n";
+    exit(1);
+}
+
+$autoload = __DIR__ . '/PHP-Parser/vendor/autoload.php';
+if (!file_exists($autoload)) {
+    echo "Cannot find PHP-Parser installation in " . __DIR__ . "/PHP-Parser\n";
+    exit(1);
+}
+
+require $autoload;
 
-require __DIR__ . '/../../PHP-Parser/vendor/autoload.php';
 $parser = new PhpParser\Parser\Php7(new PhpParser\Lexer);
 $prettyPrinter = new PhpParser\PrettyPrinter\Standard();
 
 $fuzzer->setTarget(function(string $input) use($parser, $prettyPrinter) {
     $stmts = $parser->parse($input);
     $prettyPrinter->prettyPrintFile($stmts);
 });
+
+$fuzzer->setMaxLen(1024);
+$fuzzer->addDictionary(__DIR__ . '/php.dict');

example/target_tolerant_php_parser.php

@@ -1,16 +1,20 @@
 <?php declare(strict_types=1);
 
-// Using tolerant-php-parser here, because the instrumentation uses php-parser,
-// so we can't easily fuzz php-parser itself.
-
 /** @var PhpFuzzer\Fuzzer $fuzzer */
 
-$fuzzer->setMaxLen(1024);
-$fuzzer->addDictionary(__DIR__ . '/php.dict');
+$autoload = __DIR__ . '/tolerant-php-parser/vendor/autoload.php';
+if (!file_exists($autoload)) {
+    echo "Cannot find tolerant-php-parser installation in " . __DIR__ . "/tolerant-php-parser\n";
+    exit(1);
+}
+
+require $autoload;
 
-require __DIR__ . '/../../tolerant-php-parser/vendor/autoload.php';
 $parser = new Microsoft\PhpParser\Parser();
 
 $fuzzer->setTarget(function(string $input) use($parser) {
     $parser->parseSourceFile($input);
 });
+
+$fuzzer->setMaxLen(1024);
+$fuzzer->addDictionary(__DIR__ . '/php.dict');

src/Fuzzer.php

@@ -54,7 +54,13 @@ public function __construct() {
         // Instrument everything apart from our src/ directory.
         $this->interceptor = new Interceptor();
         $this->interceptor->addWhiteList('');
+        var_dump(__DIR__);
         $this->interceptor->addBlackList(__DIR__);
+        // Don't intercept phar://.
+        // TODO: This would not be necessary if the filtering in interceptor actually worked.
+        (function() {
+            $this->protocols = ['file'];
+        })->call($this->interceptor);
         $this->interceptor->addHook(function(string $code, string $path) {
             $fileInfo = new FileInfo();
             $instrumentedCode = $this->instrumentor->instrument($code, $fileInfo);