Support many string literals in a "line response", deduplicate code

program/lib/Roundcube/rcube_imap_generic.php

@@ -220,6 +220,36 @@ class rcube_imap_generic
         return $line;
     }
 
+    /**
+     * Reads a line of data from the connection stream inluding all
+     * string continuation literals.
+     *
+     * @param int $size Buffer size
+     *
+     * @return string Line of text response
+     */
+    protected function readFullLine($size = 1024)
+    {
+        $line = $this->readLine($size);
+
+        // include all string literels untile the real end of "line"
+        while (preg_match('/\{([0-9]+)\}\r\n$/', $line, $m)) {
+            $bytes = $m[1] + 2;
+            $out   = '';
+
+            while (strlen($out) < $bytes) {
+                $out = $this->readBytes($bytes);
+                if ($out === null) {
+                    break;
+                }
+
+                $line .= $out;
+            }
+        }
+
+        return $line;
+    }
+
     /**
      * Reads more data from the connection stream when provided
      * data contain string literal
@@ -2398,7 +2428,7 @@ class rcube_imap_generic
         }
 
         do {
-            $line = $this->readLine(4096);
+            $line = $this->readFullLine(4096);
 
             if (!$line) {
                 break;
@@ -2422,27 +2452,6 @@ class rcube_imap_generic
                 $line    = substr($line, strlen($m[0]) + 2);
                 $ln      = 0;
 
-                // get complete entry
-                while (preg_match('/\{([0-9]+)\}\r\n$/', $line, $m)) {
-                    $bytes = $m[1];
-                    $out   = '';
-
-                    while (strlen($out) < $bytes) {
-                        $out = $this->readBytes($bytes);
-                        if ($out === null) {
-                            break;
-                        }
-                        $line .= $out;
-                    }
-
-                    $str = $this->readLine(4096);
-                    if ($str === false) {
-                        break;
-                    }
-
-                    $line .= $str;
-                }
-
                 // Tokenize response and assign to object properties
                 while (list($name, $value) = $this->tokenizeResponse($line, 2)) {
                     if ($name == 'UID') {
@@ -3722,24 +3731,9 @@ class rcube_imap_generic
 
         // Parse response
         do {
-            $line = $this->readLine(4096);
+            $line = $this->readFullLine(4096);
 
             if ($response !== null) {
-                // In filter mode we need additional code for string literals.
-                // We'll merge the following literal data into one chunk, so
-                // it can be compared with the filter below
-                if ($filter && preg_match('/\{([0-9]+)\}\r\n$/', $line, $match)) {
-                    // read and append the given bytes
-                    $bytes = $match[1];
-                    $out = '';
-                    while (strlen($out) < $bytes) {
-                        $tmp = $this->readBytes($bytes);
-                        if ($tmp === null) break;
-                        $out .= $tmp;
-                    }
-                    $line .= $out;
-                }
-
                 if (!$filter || preg_match($filter, $line)) {
                     $response .= $line;
                 }