From 71eb68cc467c35a70c4b3d0c46b590260fe3f303 Mon Sep 17 00:00:00 2001
From: Andy Balholm <andy@balholm.com>
Date: Thu, 4 Jul 2019 08:13:24 -0700
Subject: [PATCH] Preserve compression settings when Writer is reset.

Fixes #6
---
 encode.go | 3 ++-
 writer.go | 9 +++++----
 2 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/encode.go b/encode.go
index 0dd3a3e..c01322b 100644
--- a/encode.go
+++ b/encode.go
@@ -72,7 +72,8 @@ const (
 )
 
 type Writer struct {
-	dst io.Writer
+	dst     io.Writer
+	options WriterOptions
 
 	params              encoderParams
 	hasher_             hasherHandle
diff --git a/writer.go b/writer.go
index 92c128c..22f0faf 100644
--- a/writer.go
+++ b/writer.go
@@ -50,11 +50,8 @@ func NewWriterLevel(dst io.Writer, level int) *Writer {
 // NewWriterOptions is like NewWriter but specifies WriterOptions
 func NewWriterOptions(dst io.Writer, options WriterOptions) *Writer {
 	w := new(Writer)
+	w.options = options
 	w.Reset(dst)
-	w.params.quality = options.Quality
-	if options.LGWin > 0 {
-		w.params.lgwin = uint(options.LGWin)
-	}
 	return w
 }
 
@@ -63,6 +60,10 @@ func NewWriterOptions(dst io.Writer, options WriterOptions) *Writer {
 // instead. This permits reusing a Writer rather than allocating a new one.
 func (w *Writer) Reset(dst io.Writer) {
 	encoderInitState(w)
+	w.params.quality = w.options.Quality
+	if w.options.LGWin > 0 {
+		w.params.lgwin = uint(w.options.LGWin)
+	}
 	w.dst = dst
 }