From 9d61f243878eeabd2042bb16fe22d4325e441da6 Mon Sep 17 00:00:00 2001
From: INADA Naoki <inada-n@klab.com>
Date: Thu, 13 Feb 2014 03:10:51 +0900
Subject: Feed data from file before _unpack()

---
 msgpack/_unpacker.pyx    | 10 ++++++++++
 test/test_unpack_file.py | 19 +++++++++++++++++++
 2 files changed, 29 insertions(+)
 create mode 100644 test/test_unpack_file.py

diff --git a/msgpack/_unpacker.pyx b/msgpack/_unpacker.pyx
index 732adef..16aca5c 100644
--- a/msgpack/_unpacker.pyx
+++ b/msgpack/_unpacker.pyx
@@ -327,8 +327,18 @@ cdef class Unpacker(object):
         cdef int ret
         cdef object obj
         cdef size_t prev_head
+
+        if self.buf_head >= self.buf_tail and self.file_like is not None:
+            self.read_from_file()
+
         while 1:
             prev_head = self.buf_head
+            if prev_head >= self.buf_tail:
+                if iter:
+                    raise StopIteration("No more data to unpack.")
+                else:
+                    raise OutOfData("No more data to unpack.")
+
             ret = execute(&self.ctx, self.buf, self.buf_tail, &self.buf_head)
             if write_bytes is not None:
                 write_bytes(PyBytes_FromStringAndSize(self.buf + prev_head, self.buf_head - prev_head))
diff --git a/test/test_unpack_file.py b/test/test_unpack_file.py
new file mode 100644
index 0000000..1563008
--- /dev/null
+++ b/test/test_unpack_file.py
@@ -0,0 +1,19 @@
+from io import BytesIO
+from msgpack import Unpacker, packb, OutOfData
+from pytest import raises
+
+
+def test_unpack_array_header_from_file():
+    f = BytesIO(packb([1,2,3,4]))
+    unpacker = Unpacker(f)
+    assert unpacker.read_array_header() == 4
+    assert unpacker.unpack() == 1
+    assert unpacker.unpack() == 2
+    assert unpacker.unpack() == 3
+    assert unpacker.unpack() == 4
+    with raises(OutOfData):
+        unpacker.unpack()
+
+
+if __name__ == '__main__':
+    test_unpack_array_header_from_file()
-- 
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