Implement user-provided stream filters

Refactor QPDF_Stream to use stream filter classes to handle supported
stream filters as well.

1 files changed, 10 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index 1af2520e..7c1b43d1 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,13 @@
+2020-12-23  Jay Berkenbilt  <ejb@ql.org>
+
+	* Allow library users to provide their own decoders for stream
+	filters by deriving classes from QPDFStreamFilter and registering
+	them using QPDF::registerStreamFilter. Registered stream filters
+	provide code to validate and interpret /DecodeParms for a specific
+	/Filter and also to provide a pipeline that will decode. Note that
+	it is possible to encode to a filter type that is not supported
+	even without this feature.
+
 2020-12-22  Jay Berkenbilt  <ejb@ql.org>
 
 	* Add QPDFObjectHandle::makeDirect(bool allow_streams) -- if