2 files changed, 19 insertions, 11 deletions

diff --git a/lib/composer/composer/ClassLoader.php b/lib/composer/composer/ClassLoader.php
index bebe83706f8..dc02dfb114f 100644
--- a/lib/composer/composer/ClassLoader.php
+++ b/lib/composer/composer/ClassLoader.php
@@ -43,7 +43,7 @@ namespace Composer\Autoload;
 class ClassLoader
 {
     // PSR-4
-    private $firstCharsPsr4 = array();
+    private $prefixLengthsPsr4 = array();
     private $prefixDirsPsr4 = array();
     private $fallbackDirsPsr4 = array();
 
@@ -170,10 +170,11 @@ class ClassLoader
             }
         } elseif (!isset($this->prefixDirsPsr4[$prefix])) {
             // Register directories for a new namespace.
-            if ('\\' !== substr($prefix, -1)) {
+            $length = strlen($prefix);
+            if ('\\' !== $prefix[$length - 1]) {
                 throw new \InvalidArgumentException("A non-empty PSR-4 prefix must end with a namespace separator.");
             }
-            $this->firstCharsPsr4[$prefix[0]] = true;
+            $this->prefixLengthsPsr4[$prefix[0]][$prefix] = $length;
             $this->prefixDirsPsr4[$prefix] = (array) $paths;
         } elseif ($prepend) {
             // Prepend directories for an already registered namespace.
@@ -220,10 +221,11 @@ class ClassLoader
         if (!$prefix) {
             $this->fallbackDirsPsr4 = (array) $paths;
         } else {
-            if ('\\' !== substr($prefix, -1)) {
+            $length = strlen($prefix);
+            if ('\\' !== $prefix[$length - 1]) {
                 throw new \InvalidArgumentException("A non-empty PSR-4 prefix must end with a namespace separator.");
             }
-            $this->firstCharsPsr4[$prefix[0]] = true;
+            $this->prefixLengthsPsr4[$prefix[0]][$prefix] = $length;
             $this->prefixDirsPsr4[$prefix] = (array) $paths;
         }
     }
@@ -371,15 +373,15 @@ class ClassLoader
         $logicalPathPsr4 = strtr($class, '\\', DIRECTORY_SEPARATOR) . $ext;
 
         $first = $class[0];
-        if (isset($this->firstCharsPsr4[$first])) {
+        if (isset($this->prefixLengthsPsr4[$first])) {
             $subPath = $class;
             while (false !== $lastPos = strrpos($subPath, '\\')) {
                 $subPath = substr($subPath, 0, $lastPos);
                 $search = $subPath.'\\';
                 if (isset($this->prefixDirsPsr4[$search])) {
-                    $pathEnd = substr($logicalPathPsr4, $lastPos + 1);
+                    $pathEnd = DIRECTORY_SEPARATOR . substr($logicalPathPsr4, $lastPos + 1);
                     foreach ($this->prefixDirsPsr4[$search] as $dir) {
-                        if (file_exists($file = $dir . DIRECTORY_SEPARATOR . $pathEnd)) {
+                        if (file_exists($file = $dir . $pathEnd)) {
                             return $file;
                         }
                     }
diff --git a/lib/composer/composer/autoload_static.php b/lib/composer/composer/autoload_static.php
index 225c2eb3f20..86231a49c7b 100644
--- a/lib/composer/composer/autoload_static.php
+++ b/lib/composer/composer/autoload_static.php
@@ -6,8 +6,14 @@ namespace Composer\Autoload;
 
 class ComposerStaticInit53792487c5a8370acc0b06b1a864ff4c
 {
-    public static $firstCharsPsr4 = array (
-        'O' => true,
+    public static $prefixLengthsPsr4 = array (
+        'O' => 
+        array (
+            'OC\\Settings\\' => 12,
+            'OC\\Core\\' => 8,
+            'OC\\' => 3,
+            'OCP\\' => 4,
+        ),
     );
 
     public static $prefixDirsPsr4 = array (
@@ -842,7 +848,7 @@ class ComposerStaticInit53792487c5a8370acc0b06b1a864ff4c
     public static function getInitializer(ClassLoader $loader)
     {
         return \Closure::bind(function () use ($loader) {
-            $loader->firstCharsPsr4 = ComposerStaticInit53792487c5a8370acc0b06b1a864ff4c::$firstCharsPsr4;
+            $loader->prefixLengthsPsr4 = ComposerStaticInit53792487c5a8370acc0b06b1a864ff4c::$prefixLengthsPsr4;
             $loader->prefixDirsPsr4 = ComposerStaticInit53792487c5a8370acc0b06b1a864ff4c::$prefixDirsPsr4;
             $loader->classMap = ComposerStaticInit53792487c5a8370acc0b06b1a864ff4c::$classMap;