tee_input: restore read position after #size

It's possible for an application to call size after it has read
a few bytes/lines, so do not screw up a user's read offset when
consuming input.

1 files changed, 2 insertions, 1 deletions

diff --git a/lib/unicorn/tee_input.rb b/lib/unicorn/tee_input.rb
index 0e937ff..ee3effd 100644
--- a/lib/unicorn/tee_input.rb
+++ b/lib/unicorn/tee_input.rb
@@ -43,8 +43,9 @@ class Unicorn::TeeInput < Unicorn::StreamInput
   # specified +length+ in a loop until it returns +nil+.
   def size
     @len and return @len
+    pos = @bytes_read
     consume!
-    @tmp.rewind
+    @tmp.pos = pos
     @len = @bytes_read
   end