adding stream filter trait

1 files changed, 56 insertions, 0 deletions

diff --git a/examples/lib/FilterTranscode.php b/examples/lib/FilterTranscode.php
new file mode 100644
index 0000000..30cf1ca
--- /dev/null
+++ b/examples/lib/FilterTranscode.php
@@ -0,0 +1,56 @@
+<?php
+
+namespace lib;
+
+class FilterTranscode extends php_user_filter
+{
+    private static $name = 'convert.transcode.';
+
+    private $encoding_from = 'auto';
+
+    private $encoding_to;
+
+    public function onCreate()
+    {
+        if (strpos($this->filtername, self::$name) !== 0) {
+            return false;
+        }
+
+        $params = substr($this->filtername, strlen(self::$name));
+        if (! preg_match('/^([-\w]+)(:([-\w]+))?$/', $params, $matches)) {
+            return false;
+        }
+
+        if (isset($matches[1])) {
+            $this->encoding_from = $matches[1];
+        }
+
+        $this->encoding_to = mb_internal_encoding();
+        if (isset($matches[3])) {
+            $this->encoding_to = $matches[3];
+        }
+
+        $this->params['locale'] = setlocale(LC_CTYPE, '0');
+        if (stripos($this->params['locale'], 'UTF-8') === false) {
+            setlocale(LC_CTYPE, 'en_US.UTF-8');
+        }
+
+        return true;
+    }
+
+    public function onClose()
+    {
+        setlocale(LC_CTYPE, $this->params['locale']);
+    }
+
+    public function filter($in, $out, &$consumed, $closing)
+    {
+        while ($res = stream_bucket_make_writeable($in)) {
+            $res->data = @mb_convert_encoding($res->data, $this->encoding_to, $this->encoding_from);
+            $consumed += $res->datalen;
+            stream_bucket_append($out, $res);
+        }
+
+        return PSFS_PASS_ON;
+    }
+}