diff --git a/python/obitools3/files/linebuffer.pxd b/python/obitools3/files/linebuffer.pxd
new file mode 100644
index 0000000..a867d3e
--- /dev/null
+++ b/python/obitools3/files/linebuffer.pxd
@@ -0,0 +1,6 @@
+#cython: language_level=3
+
+
+cdef class LineBuffer:
+    cdef object fileobj
+    cdef int    size
diff --git a/python/obitools3/files/linebuffer.pyx b/python/obitools3/files/linebuffer.pyx
new file mode 100644
index 0000000..b0dbaf1
--- /dev/null
+++ b/python/obitools3/files/linebuffer.pyx
@@ -0,0 +1,23 @@
+#cython: language_level=3
+
+'''
+Created on 30 mars 2016
+
+@author: coissac
+'''
+
+cdef class LineBuffer:
+
+    def __init__(self,object fileobj,int size=100000000):
+        self.fileobj=fileobj 
+        self.size=size
+    
+    def __iter__(self):
+        cdef list buff = self.fileobj.readlines(self.size)
+        cdef str  l
+        
+        while buff:
+            for l in buff:
+                yield l
+            buff = self.fileobj.readlines(self.size)
+