require 'formula'

class Zbar < Formula
  homepage 'http://zbar.sourceforge.net'
  url 'http://downloads.sourceforge.net/project/zbar/zbar/0.10/zbar-0.10.tar.bz2'
  sha1 '273b47c26788faba4325baecc34063e27a012963'

  depends_on :x11 => :optional
  depends_on 'pkg-config' => :build
  depends_on 'jpeg'
  depends_on 'imagemagick'
  depends_on 'ufraw'

  def patches
    # fix JPEG handling using patch from
    #   http://sourceforge.net/p/zbar/discussion/664596/thread/58b8d79b#8f67
    # already applied upstream but not present in the 0.10 release
    DATA
  end

  def install
    args = %W[
      --disable-dependency-tracking
      --prefix=#{prefix}
      --without-python
      --without-qt
      --disable-video
      --without-gtk
    ]

    if build.with? 'x11'
      args << '--with-x'
    else
      args << '--without-x'
    end

    system "./configure", *args
    system "make install"
  end
end

__END__
diff --git a/zbar/jpeg.c b/zbar/jpeg.c
index fb566f4..d1c1fb2 100644
--- a/zbar/jpeg.c
+++ b/zbar/jpeg.c
@@ -79,8 +79,15 @@ int fill_input_buffer (j_decompress_ptr cinfo)
 void skip_input_data (j_decompress_ptr cinfo,
                       long num_bytes)
 {
-    cinfo->src->next_input_byte = NULL;
-    cinfo->src->bytes_in_buffer = 0;
+    if (num_bytes > 0) {
+        if (num_bytes < cinfo->src->bytes_in_buffer) {
+            cinfo->src->next_input_byte += num_bytes;
+            cinfo->src->bytes_in_buffer -= num_bytes;
+        }
+        else {
+            fill_input_buffer(cinfo);
+        }
+    }
 }
 
 void term_source (j_decompress_ptr cinfo)